src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
author zgu
Mon, 20 May 2019 09:42:37 -0400
changeset 54940 2d90a0988c95
parent 54928 fe4c2de90b59
child 54956 43340a79840d
permissions -rw-r--r--
8224210: Shenandoah: Refactor ShenandoahRootScanner to support scanning CSet codecache roots Reviewed-by: shade
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/*
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 * Copyright (c) 2013, 2019, Red Hat, Inc. All rights reserved.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "memory/allocation.hpp"
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#include "memory/universe.hpp"
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#include "gc/shared/gcArguments.hpp"
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#include "gc/shared/gcTimer.hpp"
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#include "gc/shared/gcTraceTime.inline.hpp"
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#include "gc/shared/memAllocator.hpp"
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#include "gc/shared/parallelCleaning.hpp"
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#include "gc/shared/plab.hpp"
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#include "gc/shenandoah/shenandoahAllocTracker.hpp"
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#include "gc/shenandoah/shenandoahBarrierSet.hpp"
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#include "gc/shenandoah/shenandoahForwarding.hpp"
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#include "gc/shenandoah/shenandoahClosures.inline.hpp"
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#include "gc/shenandoah/shenandoahCollectionSet.hpp"
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#include "gc/shenandoah/shenandoahCollectorPolicy.hpp"
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#include "gc/shenandoah/shenandoahConcurrentMark.inline.hpp"
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#include "gc/shenandoah/shenandoahControlThread.hpp"
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#include "gc/shenandoah/shenandoahFreeSet.hpp"
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#include "gc/shenandoah/shenandoahPhaseTimings.hpp"
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#include "gc/shenandoah/shenandoahHeap.inline.hpp"
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#include "gc/shenandoah/shenandoahHeapRegion.hpp"
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#include "gc/shenandoah/shenandoahHeapRegionSet.hpp"
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#include "gc/shenandoah/shenandoahMarkCompact.hpp"
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#include "gc/shenandoah/shenandoahMarkingContext.inline.hpp"
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#include "gc/shenandoah/shenandoahMemoryPool.hpp"
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#include "gc/shenandoah/shenandoahMetrics.hpp"
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#include "gc/shenandoah/shenandoahMonitoringSupport.hpp"
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#include "gc/shenandoah/shenandoahOopClosures.inline.hpp"
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#include "gc/shenandoah/shenandoahPacer.inline.hpp"
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#include "gc/shenandoah/shenandoahRootProcessor.inline.hpp"
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#include "gc/shenandoah/shenandoahStringDedup.hpp"
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#include "gc/shenandoah/shenandoahTaskqueue.hpp"
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#include "gc/shenandoah/shenandoahUtils.hpp"
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#include "gc/shenandoah/shenandoahVerifier.hpp"
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#include "gc/shenandoah/shenandoahCodeRoots.hpp"
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#include "gc/shenandoah/shenandoahVMOperations.hpp"
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#include "gc/shenandoah/shenandoahWorkGroup.hpp"
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#include "gc/shenandoah/shenandoahWorkerPolicy.hpp"
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#include "gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.hpp"
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#include "gc/shenandoah/heuristics/shenandoahAggressiveHeuristics.hpp"
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#include "gc/shenandoah/heuristics/shenandoahCompactHeuristics.hpp"
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#include "gc/shenandoah/heuristics/shenandoahPassiveHeuristics.hpp"
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#include "gc/shenandoah/heuristics/shenandoahStaticHeuristics.hpp"
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#include "gc/shenandoah/heuristics/shenandoahTraversalHeuristics.hpp"
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#include "memory/metaspace.hpp"
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#include "oops/compressedOops.inline.hpp"
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#include "runtime/globals.hpp"
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#include "runtime/interfaceSupport.inline.hpp"
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#include "runtime/safepointMechanism.hpp"
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#include "runtime/vmThread.hpp"
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#include "services/mallocTracker.hpp"
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#ifdef ASSERT
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template <class T>
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void ShenandoahAssertToSpaceClosure::do_oop_work(T* p) {
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  T o = RawAccess<>::oop_load(p);
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  if (! CompressedOops::is_null(o)) {
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    oop obj = CompressedOops::decode_not_null(o);
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    shenandoah_assert_not_forwarded(p, obj);
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  }
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}
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void ShenandoahAssertToSpaceClosure::do_oop(narrowOop* p) { do_oop_work(p); }
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void ShenandoahAssertToSpaceClosure::do_oop(oop* p)       { do_oop_work(p); }
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#endif
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class ShenandoahPretouchHeapTask : public AbstractGangTask {
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private:
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  ShenandoahRegionIterator _regions;
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  const size_t _page_size;
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public:
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  ShenandoahPretouchHeapTask(size_t page_size) :
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    AbstractGangTask("Shenandoah Pretouch Heap"),
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    _page_size(page_size) {}
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  virtual void work(uint worker_id) {
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    ShenandoahHeapRegion* r = _regions.next();
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    while (r != NULL) {
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      os::pretouch_memory(r->bottom(), r->end(), _page_size);
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      r = _regions.next();
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    }
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  }
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};
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class ShenandoahPretouchBitmapTask : public AbstractGangTask {
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private:
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  ShenandoahRegionIterator _regions;
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  char* _bitmap_base;
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  const size_t _bitmap_size;
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  const size_t _page_size;
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public:
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  ShenandoahPretouchBitmapTask(char* bitmap_base, size_t bitmap_size, size_t page_size) :
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    AbstractGangTask("Shenandoah Pretouch Bitmap"),
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    _bitmap_base(bitmap_base),
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    _bitmap_size(bitmap_size),
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    _page_size(page_size) {}
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  virtual void work(uint worker_id) {
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    ShenandoahHeapRegion* r = _regions.next();
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    while (r != NULL) {
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      size_t start = r->region_number()       * ShenandoahHeapRegion::region_size_bytes() / MarkBitMap::heap_map_factor();
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      size_t end   = (r->region_number() + 1) * ShenandoahHeapRegion::region_size_bytes() / MarkBitMap::heap_map_factor();
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      assert (end <= _bitmap_size, "end is sane: " SIZE_FORMAT " < " SIZE_FORMAT, end, _bitmap_size);
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      os::pretouch_memory(_bitmap_base + start, _bitmap_base + end, _page_size);
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      r = _regions.next();
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    }
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  }
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};
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jint ShenandoahHeap::initialize() {
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  ShenandoahForwarding::initial_checks();
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  initialize_heuristics();
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  //
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  // Figure out heap sizing
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  //
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  size_t init_byte_size = InitialHeapSize;
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  size_t min_byte_size  = MinHeapSize;
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  size_t max_byte_size  = MaxHeapSize;
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  size_t heap_alignment = HeapAlignment;
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  size_t reg_size_bytes = ShenandoahHeapRegion::region_size_bytes();
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  if (ShenandoahAlwaysPreTouch) {
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    // Enabled pre-touch means the entire heap is committed right away.
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    init_byte_size = max_byte_size;
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  }
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  Universe::check_alignment(max_byte_size,  reg_size_bytes, "Shenandoah heap");
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  Universe::check_alignment(init_byte_size, reg_size_bytes, "Shenandoah heap");
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  _num_regions = ShenandoahHeapRegion::region_count();
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  size_t num_committed_regions = init_byte_size / reg_size_bytes;
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  num_committed_regions = MIN2(num_committed_regions, _num_regions);
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  assert(num_committed_regions <= _num_regions, "sanity");
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  _initial_size = num_committed_regions * reg_size_bytes;
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  size_t num_min_regions = min_byte_size / reg_size_bytes;
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  num_min_regions = MIN2(num_min_regions, _num_regions);
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  assert(num_min_regions <= _num_regions, "sanity");
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  _minimum_size = num_min_regions * reg_size_bytes;
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  _committed = _initial_size;
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  size_t heap_page_size   = UseLargePages ? (size_t)os::large_page_size() : (size_t)os::vm_page_size();
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  size_t bitmap_page_size = UseLargePages ? (size_t)os::large_page_size() : (size_t)os::vm_page_size();
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  //
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  // Reserve and commit memory for heap
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  //
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  ReservedSpace heap_rs = Universe::reserve_heap(max_byte_size, heap_alignment);
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  initialize_reserved_region((HeapWord*)heap_rs.base(), (HeapWord*) (heap_rs.base() + heap_rs.size()));
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  _heap_region = MemRegion((HeapWord*)heap_rs.base(), heap_rs.size() / HeapWordSize);
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  _heap_region_special = heap_rs.special();
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  assert((((size_t) base()) & ShenandoahHeapRegion::region_size_bytes_mask()) == 0,
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         "Misaligned heap: " PTR_FORMAT, p2i(base()));
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#if SHENANDOAH_OPTIMIZED_OBJTASK
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  // The optimized ObjArrayChunkedTask takes some bits away from the full object bits.
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  // Fail if we ever attempt to address more than we can.
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  if ((uintptr_t)heap_rs.end() >= ObjArrayChunkedTask::max_addressable()) {
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    FormatBuffer<512> buf("Shenandoah reserved [" PTR_FORMAT ", " PTR_FORMAT") for the heap, \n"
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                          "but max object address is " PTR_FORMAT ". Try to reduce heap size, or try other \n"
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                          "VM options that allocate heap at lower addresses (HeapBaseMinAddress, AllocateHeapAt, etc).",
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                p2i(heap_rs.base()), p2i(heap_rs.end()), ObjArrayChunkedTask::max_addressable());
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    vm_exit_during_initialization("Fatal Error", buf);
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  }
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#endif
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  ReservedSpace sh_rs = heap_rs.first_part(max_byte_size);
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  if (!_heap_region_special) {
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    os::commit_memory_or_exit(sh_rs.base(), _initial_size, heap_alignment, false,
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                              "Cannot commit heap memory");
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  }
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  //
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  // Reserve and commit memory for bitmap(s)
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  //
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  _bitmap_size = MarkBitMap::compute_size(heap_rs.size());
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  _bitmap_size = align_up(_bitmap_size, bitmap_page_size);
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  size_t bitmap_bytes_per_region = reg_size_bytes / MarkBitMap::heap_map_factor();
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  guarantee(bitmap_bytes_per_region != 0,
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            "Bitmap bytes per region should not be zero");
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  guarantee(is_power_of_2(bitmap_bytes_per_region),
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            "Bitmap bytes per region should be power of two: " SIZE_FORMAT, bitmap_bytes_per_region);
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  if (bitmap_page_size > bitmap_bytes_per_region) {
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    _bitmap_regions_per_slice = bitmap_page_size / bitmap_bytes_per_region;
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    _bitmap_bytes_per_slice = bitmap_page_size;
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  } else {
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    _bitmap_regions_per_slice = 1;
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    _bitmap_bytes_per_slice = bitmap_bytes_per_region;
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  }
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  guarantee(_bitmap_regions_per_slice >= 1,
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            "Should have at least one region per slice: " SIZE_FORMAT,
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            _bitmap_regions_per_slice);
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  guarantee(((_bitmap_bytes_per_slice) % bitmap_page_size) == 0,
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            "Bitmap slices should be page-granular: bps = " SIZE_FORMAT ", page size = " SIZE_FORMAT,
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            _bitmap_bytes_per_slice, bitmap_page_size);
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  ReservedSpace bitmap(_bitmap_size, bitmap_page_size);
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  MemTracker::record_virtual_memory_type(bitmap.base(), mtGC);
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  _bitmap_region = MemRegion((HeapWord*) bitmap.base(), bitmap.size() / HeapWordSize);
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  _bitmap_region_special = bitmap.special();
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  size_t bitmap_init_commit = _bitmap_bytes_per_slice *
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                              align_up(num_committed_regions, _bitmap_regions_per_slice) / _bitmap_regions_per_slice;
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  bitmap_init_commit = MIN2(_bitmap_size, bitmap_init_commit);
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  if (!_bitmap_region_special) {
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    os::commit_memory_or_exit((char *) _bitmap_region.start(), bitmap_init_commit, bitmap_page_size, false,
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                              "Cannot commit bitmap memory");
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  }
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  _marking_context = new ShenandoahMarkingContext(_heap_region, _bitmap_region, _num_regions);
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  if (ShenandoahVerify) {
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    ReservedSpace verify_bitmap(_bitmap_size, bitmap_page_size);
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    if (!verify_bitmap.special()) {
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      os::commit_memory_or_exit(verify_bitmap.base(), verify_bitmap.size(), bitmap_page_size, false,
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                                "Cannot commit verification bitmap memory");
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    }
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    MemTracker::record_virtual_memory_type(verify_bitmap.base(), mtGC);
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    MemRegion verify_bitmap_region = MemRegion((HeapWord *) verify_bitmap.base(), verify_bitmap.size() / HeapWordSize);
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    _verification_bit_map.initialize(_heap_region, verify_bitmap_region);
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    _verifier = new ShenandoahVerifier(this, &_verification_bit_map);
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  }
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  // Reserve aux bitmap for use in object_iterate(). We don't commit it here.
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  ReservedSpace aux_bitmap(_bitmap_size, bitmap_page_size);
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  MemTracker::record_virtual_memory_type(aux_bitmap.base(), mtGC);
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  _aux_bitmap_region = MemRegion((HeapWord*) aux_bitmap.base(), aux_bitmap.size() / HeapWordSize);
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  _aux_bitmap_region_special = aux_bitmap.special();
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  _aux_bit_map.initialize(_heap_region, _aux_bitmap_region);
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  //
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  // Create regions and region sets
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  //
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  _regions = NEW_C_HEAP_ARRAY(ShenandoahHeapRegion*, _num_regions, mtGC);
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  _free_set = new ShenandoahFreeSet(this, _num_regions);
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  _collection_set = new ShenandoahCollectionSet(this, sh_rs.base(), sh_rs.size());
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  {
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    ShenandoahHeapLocker locker(lock());
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    size_t size_words = ShenandoahHeapRegion::region_size_words();
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    for (size_t i = 0; i < _num_regions; i++) {
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      HeapWord* start = (HeapWord*)sh_rs.base() + size_words * i;
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      bool is_committed = i < num_committed_regions;
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      ShenandoahHeapRegion* r = new ShenandoahHeapRegion(this, start, size_words, i, is_committed);
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      _marking_context->initialize_top_at_mark_start(r);
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      _regions[i] = r;
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      assert(!collection_set()->is_in(i), "New region should not be in collection set");
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    }
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    // Initialize to complete
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    _marking_context->mark_complete();
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    _free_set->rebuild();
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  }
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  if (ShenandoahAlwaysPreTouch) {
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    assert(!AlwaysPreTouch, "Should have been overridden");
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    // For NUMA, it is important to pre-touch the storage under bitmaps with worker threads,
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    // before initialize() below zeroes it with initializing thread. For any given region,
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    // we touch the region and the corresponding bitmaps from the same thread.
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    ShenandoahPushWorkerScope scope(workers(), _max_workers, false);
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    size_t pretouch_heap_page_size = heap_page_size;
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    size_t pretouch_bitmap_page_size = bitmap_page_size;
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#ifdef LINUX
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    // UseTransparentHugePages would madvise that backing memory can be coalesced into huge
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    // pages. But, the kernel needs to know that every small page is used, in order to coalesce
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    // them into huge one. Therefore, we need to pretouch with smaller pages.
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    if (UseTransparentHugePages) {
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      pretouch_heap_page_size = (size_t)os::vm_page_size();
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      pretouch_bitmap_page_size = (size_t)os::vm_page_size();
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    }
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#endif
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    // OS memory managers may want to coalesce back-to-back pages. Make their jobs
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    // simpler by pre-touching continuous spaces (heap and bitmap) separately.
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    log_info(gc, init)("Pretouch bitmap: " SIZE_FORMAT " regions, " SIZE_FORMAT " bytes page",
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                       _num_regions, pretouch_bitmap_page_size);
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    ShenandoahPretouchBitmapTask bcl(bitmap.base(), _bitmap_size, pretouch_bitmap_page_size);
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    _workers->run_task(&bcl);
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    log_info(gc, init)("Pretouch heap: " SIZE_FORMAT " regions, " SIZE_FORMAT " bytes page",
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                       _num_regions, pretouch_heap_page_size);
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    ShenandoahPretouchHeapTask hcl(pretouch_heap_page_size);
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    _workers->run_task(&hcl);
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  }
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  //
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  // Initialize the rest of GC subsystems
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  //
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  _liveness_cache = NEW_C_HEAP_ARRAY(jushort*, _max_workers, mtGC);
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  for (uint worker = 0; worker < _max_workers; worker++) {
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    _liveness_cache[worker] = NEW_C_HEAP_ARRAY(jushort, _num_regions, mtGC);
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    Copy::fill_to_bytes(_liveness_cache[worker], _num_regions * sizeof(jushort));
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  }
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  // The call below uses stuff (the SATB* things) that are in G1, but probably
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  // belong into a shared location.
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  ShenandoahBarrierSet::satb_mark_queue_set().initialize(this,
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                                                         SATB_Q_CBL_mon,
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                                                         20 /* G1SATBProcessCompletedThreshold */,
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                                                         60 /* G1SATBBufferEnqueueingThresholdPercent */);
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  _monitoring_support = new ShenandoahMonitoringSupport(this);
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  _phase_timings = new ShenandoahPhaseTimings();
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  ShenandoahStringDedup::initialize();
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  ShenandoahCodeRoots::initialize();
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  if (ShenandoahAllocationTrace) {
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    _alloc_tracker = new ShenandoahAllocTracker();
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  }
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  if (ShenandoahPacing) {
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   363
    _pacer = new ShenandoahPacer(this);
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   364
    _pacer->setup_for_idle();
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   365
  } else {
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   366
    _pacer = NULL;
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   367
  }
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   368
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   369
  _traversal_gc = heuristics()->can_do_traversal_gc() ?
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   370
                  new ShenandoahTraversalGC(this, _num_regions) :
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   371
                  NULL;
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   372
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   373
  _control_thread = new ShenandoahControlThread();
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   374
54478
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   375
  log_info(gc, init)("Initialize Shenandoah heap: " SIZE_FORMAT "%s initial, " SIZE_FORMAT "%s min, " SIZE_FORMAT "%s max",
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   376
                     byte_size_in_proper_unit(_initial_size),  proper_unit_for_byte_size(_initial_size),
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   377
                     byte_size_in_proper_unit(_minimum_size),  proper_unit_for_byte_size(_minimum_size),
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   378
                     byte_size_in_proper_unit(max_capacity()), proper_unit_for_byte_size(max_capacity())
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   379
  );
54045
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   380
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   381
  log_info(gc, init)("Safepointing mechanism: %s",
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   382
                     SafepointMechanism::uses_thread_local_poll() ? "thread-local poll" :
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   383
                     (SafepointMechanism::uses_global_page_poll() ? "global-page poll" : "unknown"));
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   384
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   385
  return JNI_OK;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   386
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   387
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   388
void ShenandoahHeap::initialize_heuristics() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   389
  if (ShenandoahGCHeuristics != NULL) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   390
    if (strcmp(ShenandoahGCHeuristics, "aggressive") == 0) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   391
      _heuristics = new ShenandoahAggressiveHeuristics();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   392
    } else if (strcmp(ShenandoahGCHeuristics, "static") == 0) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   393
      _heuristics = new ShenandoahStaticHeuristics();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   394
    } else if (strcmp(ShenandoahGCHeuristics, "adaptive") == 0) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   395
      _heuristics = new ShenandoahAdaptiveHeuristics();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   396
    } else if (strcmp(ShenandoahGCHeuristics, "passive") == 0) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   397
      _heuristics = new ShenandoahPassiveHeuristics();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   398
    } else if (strcmp(ShenandoahGCHeuristics, "compact") == 0) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   399
      _heuristics = new ShenandoahCompactHeuristics();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   400
    } else if (strcmp(ShenandoahGCHeuristics, "traversal") == 0) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   401
      _heuristics = new ShenandoahTraversalHeuristics();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   402
    } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   403
      vm_exit_during_initialization("Unknown -XX:ShenandoahGCHeuristics option");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   404
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   405
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   406
    if (_heuristics->is_diagnostic() && !UnlockDiagnosticVMOptions) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   407
      vm_exit_during_initialization(
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   408
              err_msg("Heuristics \"%s\" is diagnostic, and must be enabled via -XX:+UnlockDiagnosticVMOptions.",
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   409
                      _heuristics->name()));
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   410
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   411
    if (_heuristics->is_experimental() && !UnlockExperimentalVMOptions) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   412
      vm_exit_during_initialization(
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   413
              err_msg("Heuristics \"%s\" is experimental, and must be enabled via -XX:+UnlockExperimentalVMOptions.",
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   414
                      _heuristics->name()));
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   415
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   416
    log_info(gc, init)("Shenandoah heuristics: %s",
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   417
                       _heuristics->name());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   418
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   419
      ShouldNotReachHere();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   420
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   421
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   422
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   423
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   424
#ifdef _MSC_VER
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   425
#pragma warning( push )
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   426
#pragma warning( disable:4355 ) // 'this' : used in base member initializer list
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   427
#endif
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   428
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   429
ShenandoahHeap::ShenandoahHeap(ShenandoahCollectorPolicy* policy) :
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   430
  CollectedHeap(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   431
  _initial_size(0),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   432
  _used(0),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   433
  _committed(0),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   434
  _bytes_allocated_since_gc_start(0),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   435
  _max_workers(MAX2(ConcGCThreads, ParallelGCThreads)),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   436
  _workers(NULL),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   437
  _safepoint_workers(NULL),
54047
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
   438
  _heap_region_special(false),
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   439
  _num_regions(0),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   440
  _regions(NULL),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   441
  _update_refs_iterator(this),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   442
  _control_thread(NULL),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   443
  _shenandoah_policy(policy),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   444
  _heuristics(NULL),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   445
  _free_set(NULL),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   446
  _scm(new ShenandoahConcurrentMark()),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   447
  _traversal_gc(NULL),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   448
  _full_gc(new ShenandoahMarkCompact()),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   449
  _pacer(NULL),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   450
  _verifier(NULL),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   451
  _alloc_tracker(NULL),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   452
  _phase_timings(NULL),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   453
  _monitoring_support(NULL),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   454
  _memory_pool(NULL),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   455
  _stw_memory_manager("Shenandoah Pauses", "end of GC pause"),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   456
  _cycle_memory_manager("Shenandoah Cycles", "end of GC cycle"),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   457
  _gc_timer(new (ResourceObj::C_HEAP, mtGC) ConcurrentGCTimer()),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   458
  _soft_ref_policy(),
54388
a1acc800c87a 8220602: Shenandoah-SA: Enable best-effort implementation of heap walk
zgu
parents: 54338
diff changeset
   459
  _log_min_obj_alignment_in_bytes(LogMinObjAlignmentInBytes),
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   460
  _ref_processor(NULL),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   461
  _marking_context(NULL),
54045
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   462
  _bitmap_size(0),
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   463
  _bitmap_regions_per_slice(0),
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   464
  _bitmap_bytes_per_slice(0),
54047
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
   465
  _bitmap_region_special(false),
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
   466
  _aux_bitmap_region_special(false),
54045
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
   467
  _liveness_cache(NULL),
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   468
  _collection_set(NULL)
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   469
{
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   470
  log_info(gc, init)("GC threads: " UINT32_FORMAT " parallel, " UINT32_FORMAT " concurrent", ParallelGCThreads, ConcGCThreads);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   471
  log_info(gc, init)("Reference processing: %s", ParallelRefProcEnabled ? "parallel" : "serial");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   472
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   473
  BarrierSet::set_barrier_set(new ShenandoahBarrierSet(this));
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   474
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   475
  _max_workers = MAX2(_max_workers, 1U);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   476
  _workers = new ShenandoahWorkGang("Shenandoah GC Threads", _max_workers,
54522
60bc754b9744 8222188: Shenandoah: Adjust Shenandoah work gang types
zgu
parents: 54478
diff changeset
   477
                            /* are_GC_task_threads */ true,
60bc754b9744 8222188: Shenandoah: Adjust Shenandoah work gang types
zgu
parents: 54478
diff changeset
   478
                            /* are_ConcurrentGC_threads */ true);
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   479
  if (_workers == NULL) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   480
    vm_exit_during_initialization("Failed necessary allocation.");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   481
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   482
    _workers->initialize_workers();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   483
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   484
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   485
  if (ShenandoahParallelSafepointThreads > 1) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   486
    _safepoint_workers = new ShenandoahWorkGang("Safepoint Cleanup Thread",
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   487
                                                ShenandoahParallelSafepointThreads,
54522
60bc754b9744 8222188: Shenandoah: Adjust Shenandoah work gang types
zgu
parents: 54478
diff changeset
   488
                      /* are_GC_task_threads */ false,
60bc754b9744 8222188: Shenandoah: Adjust Shenandoah work gang types
zgu
parents: 54478
diff changeset
   489
                 /* are_ConcurrentGC_threads */ false);
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   490
    _safepoint_workers->initialize_workers();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   491
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   492
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   493
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   494
#ifdef _MSC_VER
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   495
#pragma warning( pop )
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   496
#endif
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   497
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   498
class ShenandoahResetBitmapTask : public AbstractGangTask {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   499
private:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   500
  ShenandoahRegionIterator _regions;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   501
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   502
public:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   503
  ShenandoahResetBitmapTask() :
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   504
    AbstractGangTask("Parallel Reset Bitmap Task") {}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   505
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   506
  void work(uint worker_id) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   507
    ShenandoahHeapRegion* region = _regions.next();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   508
    ShenandoahHeap* heap = ShenandoahHeap::heap();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   509
    ShenandoahMarkingContext* const ctx = heap->marking_context();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   510
    while (region != NULL) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   511
      if (heap->is_bitmap_slice_committed(region)) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   512
        ctx->clear_bitmap(region);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   513
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   514
      region = _regions.next();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   515
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   516
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   517
};
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   518
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   519
void ShenandoahHeap::reset_mark_bitmap() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   520
  assert_gc_workers(_workers->active_workers());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   521
  mark_incomplete_marking_context();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   522
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   523
  ShenandoahResetBitmapTask task;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   524
  _workers->run_task(&task);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   525
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   526
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   527
void ShenandoahHeap::print_on(outputStream* st) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   528
  st->print_cr("Shenandoah Heap");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   529
  st->print_cr(" " SIZE_FORMAT "K total, " SIZE_FORMAT "K committed, " SIZE_FORMAT "K used",
54477
511be32f3863 8222185: Shenandoah should report "committed" as capacity
shade
parents: 54463
diff changeset
   530
               max_capacity() / K, committed() / K, used() / K);
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   531
  st->print_cr(" " SIZE_FORMAT " x " SIZE_FORMAT"K regions",
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   532
               num_regions(), ShenandoahHeapRegion::region_size_bytes() / K);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   533
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   534
  st->print("Status: ");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   535
  if (has_forwarded_objects())               st->print("has forwarded objects, ");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   536
  if (is_concurrent_mark_in_progress())      st->print("marking, ");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   537
  if (is_evacuation_in_progress())           st->print("evacuating, ");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   538
  if (is_update_refs_in_progress())          st->print("updating refs, ");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   539
  if (is_concurrent_traversal_in_progress()) st->print("traversal, ");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   540
  if (is_degenerated_gc_in_progress())       st->print("degenerated gc, ");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   541
  if (is_full_gc_in_progress())              st->print("full gc, ");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   542
  if (is_full_gc_move_in_progress())         st->print("full gc move, ");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   543
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   544
  if (cancelled_gc()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   545
    st->print("cancelled");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   546
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   547
    st->print("not cancelled");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   548
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   549
  st->cr();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   550
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   551
  st->print_cr("Reserved region:");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   552
  st->print_cr(" - [" PTR_FORMAT ", " PTR_FORMAT ") ",
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   553
               p2i(reserved_region().start()),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   554
               p2i(reserved_region().end()));
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   555
54605
f6f95cb8643e 8222843: Print Shenandoah cset map addresses in hs_err
shade
parents: 54536
diff changeset
   556
  ShenandoahCollectionSet* cset = collection_set();
f6f95cb8643e 8222843: Print Shenandoah cset map addresses in hs_err
shade
parents: 54536
diff changeset
   557
  st->print_cr("Collection set:");
f6f95cb8643e 8222843: Print Shenandoah cset map addresses in hs_err
shade
parents: 54536
diff changeset
   558
  if (cset != NULL) {
f6f95cb8643e 8222843: Print Shenandoah cset map addresses in hs_err
shade
parents: 54536
diff changeset
   559
    st->print_cr(" - map (vanilla): " PTR_FORMAT, p2i(cset->map_address()));
f6f95cb8643e 8222843: Print Shenandoah cset map addresses in hs_err
shade
parents: 54536
diff changeset
   560
    st->print_cr(" - map (biased):  " PTR_FORMAT, p2i(cset->biased_map_address()));
f6f95cb8643e 8222843: Print Shenandoah cset map addresses in hs_err
shade
parents: 54536
diff changeset
   561
  } else {
f6f95cb8643e 8222843: Print Shenandoah cset map addresses in hs_err
shade
parents: 54536
diff changeset
   562
    st->print_cr(" (NULL)");
f6f95cb8643e 8222843: Print Shenandoah cset map addresses in hs_err
shade
parents: 54536
diff changeset
   563
  }
f6f95cb8643e 8222843: Print Shenandoah cset map addresses in hs_err
shade
parents: 54536
diff changeset
   564
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   565
  st->cr();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   566
  MetaspaceUtils::print_on(st);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   567
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   568
  if (Verbose) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   569
    print_heap_regions_on(st);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   570
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   571
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   572
54000
3158fae17e80 8220161: Shenandoah does not need to initialize PLABs for safepoint workers
zgu
parents: 53953
diff changeset
   573
class ShenandoahInitWorkerGCLABClosure : public ThreadClosure {
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   574
public:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   575
  void do_thread(Thread* thread) {
53953
235b0e817c32 8219857: Shenandoah GC may initialize thread's gclab twice
zgu
parents: 53873
diff changeset
   576
    assert(thread != NULL, "Sanity");
54000
3158fae17e80 8220161: Shenandoah does not need to initialize PLABs for safepoint workers
zgu
parents: 53953
diff changeset
   577
    assert(thread->is_Worker_thread(), "Only worker thread expected");
3158fae17e80 8220161: Shenandoah does not need to initialize PLABs for safepoint workers
zgu
parents: 53953
diff changeset
   578
    ShenandoahThreadLocalData::initialize_gclab(thread);
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   579
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   580
};
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   581
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   582
void ShenandoahHeap::post_initialize() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   583
  CollectedHeap::post_initialize();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   584
  MutexLocker ml(Threads_lock);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   585
54000
3158fae17e80 8220161: Shenandoah does not need to initialize PLABs for safepoint workers
zgu
parents: 53953
diff changeset
   586
  ShenandoahInitWorkerGCLABClosure init_gclabs;
3158fae17e80 8220161: Shenandoah does not need to initialize PLABs for safepoint workers
zgu
parents: 53953
diff changeset
   587
  _workers->threads_do(&init_gclabs);
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   588
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   589
  // gclab can not be initialized early during VM startup, as it can not determinate its max_size.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   590
  // Now, we will let WorkGang to initialize gclab when new worker is created.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   591
  _workers->set_initialize_gclab();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   592
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   593
  _scm->initialize(_max_workers);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   594
  _full_gc->initialize(_gc_timer);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   595
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   596
  ref_processing_init();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   597
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   598
  _heuristics->initialize();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   599
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   600
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   601
size_t ShenandoahHeap::used() const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   602
  return OrderAccess::load_acquire(&_used);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   603
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   604
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   605
size_t ShenandoahHeap::committed() const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   606
  OrderAccess::acquire();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   607
  return _committed;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   608
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   609
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   610
void ShenandoahHeap::increase_committed(size_t bytes) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   611
  assert_heaplock_or_safepoint();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   612
  _committed += bytes;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   613
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   614
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   615
void ShenandoahHeap::decrease_committed(size_t bytes) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   616
  assert_heaplock_or_safepoint();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   617
  _committed -= bytes;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   618
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   619
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   620
void ShenandoahHeap::increase_used(size_t bytes) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   621
  Atomic::add(bytes, &_used);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   622
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   623
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   624
void ShenandoahHeap::set_used(size_t bytes) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   625
  OrderAccess::release_store_fence(&_used, bytes);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   626
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   627
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   628
void ShenandoahHeap::decrease_used(size_t bytes) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   629
  assert(used() >= bytes, "never decrease heap size by more than we've left");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   630
  Atomic::sub(bytes, &_used);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   631
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   632
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   633
void ShenandoahHeap::increase_allocated(size_t bytes) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   634
  Atomic::add(bytes, &_bytes_allocated_since_gc_start);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   635
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   636
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   637
void ShenandoahHeap::notify_mutator_alloc_words(size_t words, bool waste) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   638
  size_t bytes = words * HeapWordSize;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   639
  if (!waste) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   640
    increase_used(bytes);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   641
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   642
  increase_allocated(bytes);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   643
  if (ShenandoahPacing) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   644
    control_thread()->pacing_notify_alloc(words);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   645
    if (waste) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   646
      pacer()->claim_for_alloc(words, true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   647
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   648
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   649
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   650
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   651
size_t ShenandoahHeap::capacity() const {
54477
511be32f3863 8222185: Shenandoah should report "committed" as capacity
shade
parents: 54463
diff changeset
   652
  return committed();
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   653
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   654
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   655
size_t ShenandoahHeap::max_capacity() const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   656
  return _num_regions * ShenandoahHeapRegion::region_size_bytes();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   657
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   658
54478
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   659
size_t ShenandoahHeap::min_capacity() const {
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   660
  return _minimum_size;
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   661
}
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   662
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   663
size_t ShenandoahHeap::initial_capacity() const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   664
  return _initial_size;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   665
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   666
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   667
bool ShenandoahHeap::is_in(const void* p) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   668
  HeapWord* heap_base = (HeapWord*) base();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   669
  HeapWord* last_region_end = heap_base + ShenandoahHeapRegion::region_size_words() * num_regions();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   670
  return p >= heap_base && p < last_region_end;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   671
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   672
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   673
void ShenandoahHeap::op_uncommit(double shrink_before) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   674
  assert (ShenandoahUncommit, "should be enabled");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   675
54478
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   676
  // Application allocates from the beginning of the heap, and GC allocates at
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   677
  // the end of it. It is more efficient to uncommit from the end, so that applications
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   678
  // could enjoy the near committed regions. GC allocations are much less frequent,
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   679
  // and therefore can accept the committing costs.
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   680
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   681
  size_t count = 0;
54478
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   682
  for (size_t i = num_regions(); i > 0; i--) { // care about size_t underflow
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   683
    ShenandoahHeapRegion* r = get_region(i - 1);
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   684
    if (r->is_empty_committed() && (r->empty_time() < shrink_before)) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   685
      ShenandoahHeapLocker locker(lock());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   686
      if (r->is_empty_committed()) {
54478
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   687
        // Do not uncommit below minimal capacity
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   688
        if (committed() < min_capacity() + ShenandoahHeapRegion::region_size_bytes()) {
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   689
          break;
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   690
        }
cdc54443fee5 8222186: Shenandoah should not uncommit below minimum heap size
shade
parents: 54477
diff changeset
   691
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   692
        r->make_uncommitted();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   693
        count++;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   694
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   695
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   696
    SpinPause(); // allow allocators to take the lock
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   697
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   698
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   699
  if (count > 0) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   700
    control_thread()->notify_heap_changed();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   701
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   702
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   703
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   704
HeapWord* ShenandoahHeap::allocate_from_gclab_slow(Thread* thread, size_t size) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   705
  // New object should fit the GCLAB size
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   706
  size_t min_size = MAX2(size, PLAB::min_size());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   707
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   708
  // Figure out size of new GCLAB, looking back at heuristics. Expand aggressively.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   709
  size_t new_size = ShenandoahThreadLocalData::gclab_size(thread) * 2;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   710
  new_size = MIN2(new_size, PLAB::max_size());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   711
  new_size = MAX2(new_size, PLAB::min_size());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   712
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   713
  // Record new heuristic value even if we take any shortcut. This captures
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   714
  // the case when moderately-sized objects always take a shortcut. At some point,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   715
  // heuristics should catch up with them.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   716
  ShenandoahThreadLocalData::set_gclab_size(thread, new_size);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   717
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   718
  if (new_size < size) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   719
    // New size still does not fit the object. Fall back to shared allocation.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   720
    // This avoids retiring perfectly good GCLABs, when we encounter a large object.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   721
    return NULL;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   722
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   723
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   724
  // Retire current GCLAB, and allocate a new one.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   725
  PLAB* gclab = ShenandoahThreadLocalData::gclab(thread);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   726
  gclab->retire();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   727
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   728
  size_t actual_size = 0;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   729
  HeapWord* gclab_buf = allocate_new_gclab(min_size, new_size, &actual_size);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   730
  if (gclab_buf == NULL) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   731
    return NULL;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   732
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   733
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   734
  assert (size <= actual_size, "allocation should fit");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   735
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   736
  if (ZeroTLAB) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   737
    // ..and clear it.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   738
    Copy::zero_to_words(gclab_buf, actual_size);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   739
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   740
    // ...and zap just allocated object.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   741
#ifdef ASSERT
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   742
    // Skip mangling the space corresponding to the object header to
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   743
    // ensure that the returned space is not considered parsable by
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   744
    // any concurrent GC thread.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   745
    size_t hdr_size = oopDesc::header_size();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   746
    Copy::fill_to_words(gclab_buf + hdr_size, actual_size - hdr_size, badHeapWordVal);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   747
#endif // ASSERT
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   748
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   749
  gclab->set_buf(gclab_buf, actual_size);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   750
  return gclab->allocate(size);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   751
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   752
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   753
HeapWord* ShenandoahHeap::allocate_new_tlab(size_t min_size,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   754
                                            size_t requested_size,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   755
                                            size_t* actual_size) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   756
  ShenandoahAllocRequest req = ShenandoahAllocRequest::for_tlab(min_size, requested_size);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   757
  HeapWord* res = allocate_memory(req);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   758
  if (res != NULL) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   759
    *actual_size = req.actual_size();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   760
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   761
    *actual_size = 0;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   762
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   763
  return res;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   764
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   765
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   766
HeapWord* ShenandoahHeap::allocate_new_gclab(size_t min_size,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   767
                                             size_t word_size,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   768
                                             size_t* actual_size) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   769
  ShenandoahAllocRequest req = ShenandoahAllocRequest::for_gclab(min_size, word_size);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   770
  HeapWord* res = allocate_memory(req);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   771
  if (res != NULL) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   772
    *actual_size = req.actual_size();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   773
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   774
    *actual_size = 0;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   775
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   776
  return res;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   777
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   778
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   779
ShenandoahHeap* ShenandoahHeap::heap() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   780
  CollectedHeap* heap = Universe::heap();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   781
  assert(heap != NULL, "Unitialized access to ShenandoahHeap::heap()");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   782
  assert(heap->kind() == CollectedHeap::Shenandoah, "not a shenandoah heap");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   783
  return (ShenandoahHeap*) heap;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   784
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   785
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   786
ShenandoahHeap* ShenandoahHeap::heap_no_check() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   787
  CollectedHeap* heap = Universe::heap();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   788
  return (ShenandoahHeap*) heap;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   789
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   790
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   791
HeapWord* ShenandoahHeap::allocate_memory(ShenandoahAllocRequest& req) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   792
  ShenandoahAllocTrace trace_alloc(req.size(), req.type());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   793
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   794
  intptr_t pacer_epoch = 0;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   795
  bool in_new_region = false;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   796
  HeapWord* result = NULL;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   797
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   798
  if (req.is_mutator_alloc()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   799
    if (ShenandoahPacing) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   800
      pacer()->pace_for_alloc(req.size());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   801
      pacer_epoch = pacer()->epoch();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   802
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   803
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   804
    if (!ShenandoahAllocFailureALot || !should_inject_alloc_failure()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   805
      result = allocate_memory_under_lock(req, in_new_region);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   806
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   807
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   808
    // Allocation failed, block until control thread reacted, then retry allocation.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   809
    //
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   810
    // It might happen that one of the threads requesting allocation would unblock
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   811
    // way later after GC happened, only to fail the second allocation, because
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   812
    // other threads have already depleted the free storage. In this case, a better
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   813
    // strategy is to try again, as long as GC makes progress.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   814
    //
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   815
    // Then, we need to make sure the allocation was retried after at least one
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   816
    // Full GC, which means we want to try more than ShenandoahFullGCThreshold times.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   817
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   818
    size_t tries = 0;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   819
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   820
    while (result == NULL && _progress_last_gc.is_set()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   821
      tries++;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   822
      control_thread()->handle_alloc_failure(req.size());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   823
      result = allocate_memory_under_lock(req, in_new_region);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   824
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   825
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   826
    while (result == NULL && tries <= ShenandoahFullGCThreshold) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   827
      tries++;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   828
      control_thread()->handle_alloc_failure(req.size());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   829
      result = allocate_memory_under_lock(req, in_new_region);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   830
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   831
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   832
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   833
    assert(req.is_gc_alloc(), "Can only accept GC allocs here");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   834
    result = allocate_memory_under_lock(req, in_new_region);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   835
    // Do not call handle_alloc_failure() here, because we cannot block.
54423
6c0ab8bd8da5 8221766: Load-reference barriers for Shenandoah
rkennke
parents: 54388
diff changeset
   836
    // The allocation failure would be handled by the LRB slowpath with handle_alloc_failure_evac().
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   837
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   838
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   839
  if (in_new_region) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   840
    control_thread()->notify_heap_changed();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   841
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   842
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   843
  if (result != NULL) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   844
    size_t requested = req.size();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   845
    size_t actual = req.actual_size();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   846
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   847
    assert (req.is_lab_alloc() || (requested == actual),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   848
            "Only LAB allocations are elastic: %s, requested = " SIZE_FORMAT ", actual = " SIZE_FORMAT,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   849
            ShenandoahAllocRequest::alloc_type_to_string(req.type()), requested, actual);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   850
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   851
    if (req.is_mutator_alloc()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   852
      notify_mutator_alloc_words(actual, false);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   853
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   854
      // If we requested more than we were granted, give the rest back to pacer.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   855
      // This only matters if we are in the same pacing epoch: do not try to unpace
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   856
      // over the budget for the other phase.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   857
      if (ShenandoahPacing && (pacer_epoch > 0) && (requested > actual)) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   858
        pacer()->unpace_for_alloc(pacer_epoch, requested - actual);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   859
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   860
    } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   861
      increase_used(actual*HeapWordSize);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   862
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   863
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   864
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   865
  return result;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   866
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   867
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   868
HeapWord* ShenandoahHeap::allocate_memory_under_lock(ShenandoahAllocRequest& req, bool& in_new_region) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   869
  ShenandoahHeapLocker locker(lock());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   870
  return _free_set->allocate(req, in_new_region);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   871
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   872
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   873
class ShenandoahMemAllocator : public MemAllocator {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   874
private:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   875
  MemAllocator& _initializer;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   876
public:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   877
  ShenandoahMemAllocator(MemAllocator& initializer, Klass* klass, size_t word_size, Thread* thread) :
54766
1321f8cf9de5 8223567: Rename ShenandoahBrooksPointer to ShenandoahForwarding
rkennke
parents: 54687
diff changeset
   878
  MemAllocator(klass, word_size + ShenandoahForwarding::word_size(), thread),
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   879
    _initializer(initializer) {}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   880
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   881
protected:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   882
  virtual HeapWord* mem_allocate(Allocation& allocation) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   883
    HeapWord* result = MemAllocator::mem_allocate(allocation);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   884
    // Initialize brooks-pointer
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   885
    if (result != NULL) {
54766
1321f8cf9de5 8223567: Rename ShenandoahBrooksPointer to ShenandoahForwarding
rkennke
parents: 54687
diff changeset
   886
      result += ShenandoahForwarding::word_size();
1321f8cf9de5 8223567: Rename ShenandoahBrooksPointer to ShenandoahForwarding
rkennke
parents: 54687
diff changeset
   887
      ShenandoahForwarding::initialize(oop(result));
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   888
      assert(! ShenandoahHeap::heap()->in_collection_set(result), "never allocate in targetted region");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   889
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   890
    return result;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   891
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   892
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   893
  virtual oop initialize(HeapWord* mem) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   894
     return _initializer.initialize(mem);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   895
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   896
};
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   897
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   898
oop ShenandoahHeap::obj_allocate(Klass* klass, int size, TRAPS) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   899
  ObjAllocator initializer(klass, size, THREAD);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   900
  ShenandoahMemAllocator allocator(initializer, klass, size, THREAD);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   901
  return allocator.allocate();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   902
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   903
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   904
oop ShenandoahHeap::array_allocate(Klass* klass, int size, int length, bool do_zero, TRAPS) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   905
  ObjArrayAllocator initializer(klass, size, length, do_zero, THREAD);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   906
  ShenandoahMemAllocator allocator(initializer, klass, size, THREAD);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   907
  return allocator.allocate();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   908
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   909
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   910
oop ShenandoahHeap::class_allocate(Klass* klass, int size, TRAPS) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   911
  ClassAllocator initializer(klass, size, THREAD);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   912
  ShenandoahMemAllocator allocator(initializer, klass, size, THREAD);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   913
  return allocator.allocate();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   914
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   915
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   916
HeapWord* ShenandoahHeap::mem_allocate(size_t size,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   917
                                        bool*  gc_overhead_limit_was_exceeded) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   918
  ShenandoahAllocRequest req = ShenandoahAllocRequest::for_shared(size);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   919
  return allocate_memory(req);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   920
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   921
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   922
MetaWord* ShenandoahHeap::satisfy_failed_metadata_allocation(ClassLoaderData* loader_data,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   923
                                                             size_t size,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   924
                                                             Metaspace::MetadataType mdtype) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   925
  MetaWord* result;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   926
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   927
  // Inform metaspace OOM to GC heuristics if class unloading is possible.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   928
  if (heuristics()->can_unload_classes()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   929
    ShenandoahHeuristics* h = heuristics();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   930
    h->record_metaspace_oom();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   931
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   932
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   933
  // Expand and retry allocation
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   934
  result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   935
  if (result != NULL) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   936
    return result;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   937
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   938
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   939
  // Start full GC
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   940
  collect(GCCause::_metadata_GC_clear_soft_refs);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   941
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   942
  // Retry allocation
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   943
  result = loader_data->metaspace_non_null()->allocate(size, mdtype);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   944
  if (result != NULL) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   945
    return result;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   946
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   947
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   948
  // Expand and retry allocation
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   949
  result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   950
  if (result != NULL) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   951
    return result;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   952
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   953
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   954
  // Out of memory
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   955
  return NULL;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   956
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   957
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   958
void ShenandoahHeap::fill_with_dummy_object(HeapWord* start, HeapWord* end, bool zap) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   959
  HeapWord* obj = tlab_post_allocation_setup(start);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   960
  CollectedHeap::fill_with_object(obj, end);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   961
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   962
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   963
size_t ShenandoahHeap::min_dummy_object_size() const {
54766
1321f8cf9de5 8223567: Rename ShenandoahBrooksPointer to ShenandoahForwarding
rkennke
parents: 54687
diff changeset
   964
  return CollectedHeap::min_dummy_object_size() + ShenandoahForwarding::word_size();
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   965
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   966
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   967
class ShenandoahConcurrentEvacuateRegionObjectClosure : public ObjectClosure {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   968
private:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   969
  ShenandoahHeap* const _heap;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   970
  Thread* const _thread;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   971
public:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   972
  ShenandoahConcurrentEvacuateRegionObjectClosure(ShenandoahHeap* heap) :
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   973
    _heap(heap), _thread(Thread::current()) {}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   974
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   975
  void do_object(oop p) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   976
    shenandoah_assert_marked(NULL, p);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   977
    if (oopDesc::equals_raw(p, ShenandoahBarrierSet::resolve_forwarded_not_null(p))) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   978
      _heap->evacuate_object(p, _thread);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   979
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   980
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   981
};
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   982
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   983
class ShenandoahEvacuationTask : public AbstractGangTask {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   984
private:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   985
  ShenandoahHeap* const _sh;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   986
  ShenandoahCollectionSet* const _cs;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   987
  bool _concurrent;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   988
public:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   989
  ShenandoahEvacuationTask(ShenandoahHeap* sh,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   990
                           ShenandoahCollectionSet* cs,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   991
                           bool concurrent) :
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   992
    AbstractGangTask("Parallel Evacuation Task"),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   993
    _sh(sh),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   994
    _cs(cs),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   995
    _concurrent(concurrent)
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   996
  {}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   997
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   998
  void work(uint worker_id) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
   999
    if (_concurrent) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1000
      ShenandoahConcurrentWorkerSession worker_session(worker_id);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1001
      ShenandoahSuspendibleThreadSetJoiner stsj(ShenandoahSuspendibleWorkers);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1002
      ShenandoahEvacOOMScope oom_evac_scope;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1003
      do_work();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1004
    } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1005
      ShenandoahParallelWorkerSession worker_session(worker_id);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1006
      ShenandoahEvacOOMScope oom_evac_scope;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1007
      do_work();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1008
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1009
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1010
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1011
private:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1012
  void do_work() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1013
    ShenandoahConcurrentEvacuateRegionObjectClosure cl(_sh);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1014
    ShenandoahHeapRegion* r;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1015
    while ((r =_cs->claim_next()) != NULL) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1016
      assert(r->has_live(), "all-garbage regions are reclaimed early");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1017
      _sh->marked_object_iterate(r, &cl);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1018
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1019
      if (ShenandoahPacing) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1020
        _sh->pacer()->report_evac(r->used() >> LogHeapWordSize);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1021
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1022
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1023
      if (_sh->check_cancelled_gc_and_yield(_concurrent)) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1024
        break;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1025
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1026
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1027
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1028
};
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1029
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1030
void ShenandoahHeap::trash_cset_regions() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1031
  ShenandoahHeapLocker locker(lock());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1032
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1033
  ShenandoahCollectionSet* set = collection_set();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1034
  ShenandoahHeapRegion* r;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1035
  set->clear_current_index();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1036
  while ((r = set->next()) != NULL) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1037
    r->make_trash();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1038
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1039
  collection_set()->clear();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1040
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1041
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1042
void ShenandoahHeap::print_heap_regions_on(outputStream* st) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1043
  st->print_cr("Heap Regions:");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1044
  st->print_cr("EU=empty-uncommitted, EC=empty-committed, R=regular, H=humongous start, HC=humongous continuation, CS=collection set, T=trash, P=pinned");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1045
  st->print_cr("BTE=bottom/top/end, U=used, T=TLAB allocs, G=GCLAB allocs, S=shared allocs, L=live data");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1046
  st->print_cr("R=root, CP=critical pins, TAMS=top-at-mark-start (previous, next)");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1047
  st->print_cr("SN=alloc sequence numbers (first mutator, last mutator, first gc, last gc)");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1048
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1049
  for (size_t i = 0; i < num_regions(); i++) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1050
    get_region(i)->print_on(st);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1051
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1052
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1053
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1054
void ShenandoahHeap::trash_humongous_region_at(ShenandoahHeapRegion* start) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1055
  assert(start->is_humongous_start(), "reclaim regions starting with the first one");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1056
54766
1321f8cf9de5 8223567: Rename ShenandoahBrooksPointer to ShenandoahForwarding
rkennke
parents: 54687
diff changeset
  1057
  oop humongous_obj = oop(start->bottom() + ShenandoahForwarding::word_size());
1321f8cf9de5 8223567: Rename ShenandoahBrooksPointer to ShenandoahForwarding
rkennke
parents: 54687
diff changeset
  1058
  size_t size = humongous_obj->size() + ShenandoahForwarding::word_size();
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1059
  size_t required_regions = ShenandoahHeapRegion::required_regions(size * HeapWordSize);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1060
  size_t index = start->region_number() + required_regions - 1;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1061
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1062
  assert(!start->has_live(), "liveness must be zero");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1063
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1064
  for(size_t i = 0; i < required_regions; i++) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1065
    // Reclaim from tail. Otherwise, assertion fails when printing region to trace log,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1066
    // as it expects that every region belongs to a humongous region starting with a humongous start region.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1067
    ShenandoahHeapRegion* region = get_region(index --);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1068
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1069
    assert(region->is_humongous(), "expect correct humongous start or continuation");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1070
    assert(!region->is_cset(), "Humongous region should not be in collection set");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1071
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1072
    region->make_trash_immediate();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1073
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1074
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1075
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1076
class ShenandoahRetireGCLABClosure : public ThreadClosure {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1077
public:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1078
  void do_thread(Thread* thread) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1079
    PLAB* gclab = ShenandoahThreadLocalData::gclab(thread);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1080
    assert(gclab != NULL, "GCLAB should be initialized for %s", thread->name());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1081
    gclab->retire();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1082
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1083
};
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1084
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1085
void ShenandoahHeap::make_parsable(bool retire_tlabs) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1086
  if (UseTLAB) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1087
    CollectedHeap::ensure_parsability(retire_tlabs);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1088
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1089
  ShenandoahRetireGCLABClosure cl;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1090
  for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1091
    cl.do_thread(t);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1092
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1093
  workers()->threads_do(&cl);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1094
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1095
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1096
void ShenandoahHeap::resize_tlabs() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1097
  CollectedHeap::resize_all_tlabs();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1098
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1099
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1100
class ShenandoahEvacuateUpdateRootsTask : public AbstractGangTask {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1101
private:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1102
  ShenandoahRootEvacuator* _rp;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1103
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1104
public:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1105
  ShenandoahEvacuateUpdateRootsTask(ShenandoahRootEvacuator* rp) :
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1106
    AbstractGangTask("Shenandoah evacuate and update roots"),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1107
    _rp(rp) {}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1108
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1109
  void work(uint worker_id) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1110
    ShenandoahParallelWorkerSession worker_session(worker_id);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1111
    ShenandoahEvacOOMScope oom_evac_scope;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1112
    ShenandoahEvacuateUpdateRootsClosure cl;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1113
    MarkingCodeBlobClosure blobsCl(&cl, CodeBlobToOopClosure::FixRelocations);
54924
ba1eccda5450 8223774: Shenandoah: Refactor ShenandoahRootProcessor and family
zgu
parents: 54890
diff changeset
  1114
    _rp->roots_do(worker_id, &cl);
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1115
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1116
};
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1117
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1118
void ShenandoahHeap::evacuate_and_update_roots() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1119
#if defined(COMPILER2) || INCLUDE_JVMCI
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1120
  DerivedPointerTable::clear();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1121
#endif
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1122
  assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Only iterate roots while world is stopped");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1123
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1124
  {
54924
ba1eccda5450 8223774: Shenandoah: Refactor ShenandoahRootProcessor and family
zgu
parents: 54890
diff changeset
  1125
    ShenandoahRootEvacuator rp(workers()->active_workers(), ShenandoahPhaseTimings::init_evac);
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1126
    ShenandoahEvacuateUpdateRootsTask roots_task(&rp);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1127
    workers()->run_task(&roots_task);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1128
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1129
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1130
#if defined(COMPILER2) || INCLUDE_JVMCI
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1131
  DerivedPointerTable::update_pointers();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1132
#endif
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1133
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1134
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1135
// Returns size in bytes
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1136
size_t ShenandoahHeap::unsafe_max_tlab_alloc(Thread *thread) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1137
  if (ShenandoahElasticTLAB) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1138
    // With Elastic TLABs, return the max allowed size, and let the allocation path
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1139
    // figure out the safe size for current allocation.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1140
    return ShenandoahHeapRegion::max_tlab_size_bytes();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1141
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1142
    return MIN2(_free_set->unsafe_peek_free(), ShenandoahHeapRegion::max_tlab_size_bytes());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1143
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1144
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1145
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1146
size_t ShenandoahHeap::max_tlab_size() const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1147
  // Returns size in words
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1148
  return ShenandoahHeapRegion::max_tlab_size_words();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1149
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1150
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1151
class ShenandoahRetireAndResetGCLABClosure : public ThreadClosure {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1152
public:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1153
  void do_thread(Thread* thread) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1154
    PLAB* gclab = ShenandoahThreadLocalData::gclab(thread);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1155
    gclab->retire();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1156
    if (ShenandoahThreadLocalData::gclab_size(thread) > 0) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1157
      ShenandoahThreadLocalData::set_gclab_size(thread, 0);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1158
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1159
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1160
};
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1161
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1162
void ShenandoahHeap::retire_and_reset_gclabs() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1163
  ShenandoahRetireAndResetGCLABClosure cl;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1164
  for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1165
    cl.do_thread(t);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1166
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1167
  workers()->threads_do(&cl);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1168
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1169
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1170
void ShenandoahHeap::collect(GCCause::Cause cause) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1171
  control_thread()->request_gc(cause);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1172
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1173
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1174
void ShenandoahHeap::do_full_collection(bool clear_all_soft_refs) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1175
  //assert(false, "Shouldn't need to do full collections");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1176
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1177
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1178
HeapWord* ShenandoahHeap::block_start(const void* addr) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1179
  Space* sp = heap_region_containing(addr);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1180
  if (sp != NULL) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1181
    return sp->block_start(addr);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1182
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1183
  return NULL;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1184
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1185
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1186
bool ShenandoahHeap::block_is_obj(const HeapWord* addr) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1187
  Space* sp = heap_region_containing(addr);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1188
  return sp->block_is_obj(addr);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1189
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1190
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1191
jlong ShenandoahHeap::millis_since_last_gc() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1192
  double v = heuristics()->time_since_last_gc() * 1000;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1193
  assert(0 <= v && v <= max_jlong, "value should fit: %f", v);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1194
  return (jlong)v;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1195
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1196
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1197
void ShenandoahHeap::prepare_for_verify() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1198
  if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1199
    make_parsable(false);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1200
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1201
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1202
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1203
void ShenandoahHeap::print_gc_threads_on(outputStream* st) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1204
  workers()->print_worker_threads_on(st);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1205
  if (ShenandoahStringDedup::is_enabled()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1206
    ShenandoahStringDedup::print_worker_threads_on(st);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1207
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1208
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1209
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1210
void ShenandoahHeap::gc_threads_do(ThreadClosure* tcl) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1211
  workers()->threads_do(tcl);
54457
40dc805f4709 8222125: Shenandoah: Crash when running with ShenandoahParallelSafepointThreads=1
rkennke
parents: 54425
diff changeset
  1212
  if (_safepoint_workers != NULL) {
40dc805f4709 8222125: Shenandoah: Crash when running with ShenandoahParallelSafepointThreads=1
rkennke
parents: 54425
diff changeset
  1213
    _safepoint_workers->threads_do(tcl);
40dc805f4709 8222125: Shenandoah: Crash when running with ShenandoahParallelSafepointThreads=1
rkennke
parents: 54425
diff changeset
  1214
  }
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1215
  if (ShenandoahStringDedup::is_enabled()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1216
    ShenandoahStringDedup::threads_do(tcl);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1217
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1218
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1219
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1220
void ShenandoahHeap::print_tracing_info() const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1221
  LogTarget(Info, gc, stats) lt;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1222
  if (lt.is_enabled()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1223
    ResourceMark rm;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1224
    LogStream ls(lt);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1225
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1226
    phase_timings()->print_on(&ls);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1227
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1228
    ls.cr();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1229
    ls.cr();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1230
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1231
    shenandoah_policy()->print_gc_stats(&ls);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1232
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1233
    ls.cr();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1234
    ls.cr();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1235
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1236
    if (ShenandoahPacing) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1237
      pacer()->print_on(&ls);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1238
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1239
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1240
    ls.cr();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1241
    ls.cr();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1242
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1243
    if (ShenandoahAllocationTrace) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1244
      assert(alloc_tracker() != NULL, "Must be");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1245
      alloc_tracker()->print_on(&ls);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1246
    } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1247
      ls.print_cr("  Allocation tracing is disabled, use -XX:+ShenandoahAllocationTrace to enable.");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1248
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1249
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1250
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1251
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1252
void ShenandoahHeap::verify(VerifyOption vo) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1253
  if (ShenandoahSafepoint::is_at_shenandoah_safepoint()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1254
    if (ShenandoahVerify) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1255
      verifier()->verify_generic(vo);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1256
    } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1257
      // TODO: Consider allocating verification bitmaps on demand,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1258
      // and turn this on unconditionally.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1259
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1260
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1261
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1262
size_t ShenandoahHeap::tlab_capacity(Thread *thr) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1263
  return _free_set->capacity();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1264
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1265
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1266
class ObjectIterateScanRootClosure : public BasicOopIterateClosure {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1267
private:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1268
  MarkBitMap* _bitmap;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1269
  Stack<oop,mtGC>* _oop_stack;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1270
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1271
  template <class T>
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1272
  void do_oop_work(T* p) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1273
    T o = RawAccess<>::oop_load(p);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1274
    if (!CompressedOops::is_null(o)) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1275
      oop obj = CompressedOops::decode_not_null(o);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1276
      obj = ShenandoahBarrierSet::resolve_forwarded_not_null(obj);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1277
      assert(oopDesc::is_oop(obj), "must be a valid oop");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1278
      if (!_bitmap->is_marked((HeapWord*) obj)) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1279
        _bitmap->mark((HeapWord*) obj);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1280
        _oop_stack->push(obj);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1281
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1282
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1283
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1284
public:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1285
  ObjectIterateScanRootClosure(MarkBitMap* bitmap, Stack<oop,mtGC>* oop_stack) :
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1286
    _bitmap(bitmap), _oop_stack(oop_stack) {}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1287
  void do_oop(oop* p)       { do_oop_work(p); }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1288
  void do_oop(narrowOop* p) { do_oop_work(p); }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1289
};
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1290
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1291
/*
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1292
 * This is public API, used in preparation of object_iterate().
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1293
 * Since we don't do linear scan of heap in object_iterate() (see comment below), we don't
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1294
 * need to make the heap parsable. For Shenandoah-internal linear heap scans that we can
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1295
 * control, we call SH::make_tlabs_parsable().
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1296
 */
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1297
void ShenandoahHeap::ensure_parsability(bool retire_tlabs) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1298
  // No-op.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1299
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1300
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1301
/*
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1302
 * Iterates objects in the heap. This is public API, used for, e.g., heap dumping.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1303
 *
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1304
 * We cannot safely iterate objects by doing a linear scan at random points in time. Linear
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1305
 * scanning needs to deal with dead objects, which may have dead Klass* pointers (e.g.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1306
 * calling oopDesc::size() would crash) or dangling reference fields (crashes) etc. Linear
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1307
 * scanning therefore depends on having a valid marking bitmap to support it. However, we only
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1308
 * have a valid marking bitmap after successful marking. In particular, we *don't* have a valid
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1309
 * marking bitmap during marking, after aborted marking or during/after cleanup (when we just
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1310
 * wiped the bitmap in preparation for next marking).
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1311
 *
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1312
 * For all those reasons, we implement object iteration as a single marking traversal, reporting
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1313
 * objects as we mark+traverse through the heap, starting from GC roots. JVMTI IterateThroughHeap
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1314
 * is allowed to report dead objects, but is not required to do so.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1315
 */
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1316
void ShenandoahHeap::object_iterate(ObjectClosure* cl) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1317
  assert(SafepointSynchronize::is_at_safepoint(), "safe iteration is only available during safepoints");
54047
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
  1318
  if (!_aux_bitmap_region_special && !os::commit_memory((char*)_aux_bitmap_region.start(), _aux_bitmap_region.byte_size(), false)) {
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1319
    log_warning(gc)("Could not commit native memory for auxiliary marking bitmap for heap iteration");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1320
    return;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1321
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1322
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1323
  // Reset bitmap
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1324
  _aux_bit_map.clear();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1325
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1326
  Stack<oop,mtGC> oop_stack;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1327
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1328
  // First, we process all GC roots. This populates the work stack with initial objects.
54940
2d90a0988c95 8224210: Shenandoah: Refactor ShenandoahRootScanner to support scanning CSet codecache roots
zgu
parents: 54928
diff changeset
  1329
  ShenandoahAllRootScanner rp(1, ShenandoahPhaseTimings::_num_phases);
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1330
  ObjectIterateScanRootClosure oops(&_aux_bit_map, &oop_stack);
54924
ba1eccda5450 8223774: Shenandoah: Refactor ShenandoahRootProcessor and family
zgu
parents: 54890
diff changeset
  1331
  rp.roots_do(0, &oops);
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1332
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1333
  // Work through the oop stack to traverse heap.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1334
  while (! oop_stack.is_empty()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1335
    oop obj = oop_stack.pop();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1336
    assert(oopDesc::is_oop(obj), "must be a valid oop");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1337
    cl->do_object(obj);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1338
    obj->oop_iterate(&oops);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1339
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1340
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1341
  assert(oop_stack.is_empty(), "should be empty");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1342
54047
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
  1343
  if (!_aux_bitmap_region_special && !os::uncommit_memory((char*)_aux_bitmap_region.start(), _aux_bitmap_region.byte_size())) {
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1344
    log_warning(gc)("Could not uncommit native memory for auxiliary marking bitmap for heap iteration");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1345
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1346
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1347
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1348
void ShenandoahHeap::safe_object_iterate(ObjectClosure* cl) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1349
  assert(SafepointSynchronize::is_at_safepoint(), "safe iteration is only available during safepoints");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1350
  object_iterate(cl);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1351
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1352
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1353
void ShenandoahHeap::heap_region_iterate(ShenandoahHeapRegionClosure* blk) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1354
  for (size_t i = 0; i < num_regions(); i++) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1355
    ShenandoahHeapRegion* current = get_region(i);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1356
    blk->heap_region_do(current);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1357
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1358
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1359
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1360
class ShenandoahParallelHeapRegionTask : public AbstractGangTask {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1361
private:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1362
  ShenandoahHeap* const _heap;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1363
  ShenandoahHeapRegionClosure* const _blk;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1364
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1365
  DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile size_t));
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1366
  volatile size_t _index;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1367
  DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, 0);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1368
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1369
public:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1370
  ShenandoahParallelHeapRegionTask(ShenandoahHeapRegionClosure* blk) :
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1371
          AbstractGangTask("Parallel Region Task"),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1372
          _heap(ShenandoahHeap::heap()), _blk(blk), _index(0) {}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1373
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1374
  void work(uint worker_id) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1375
    size_t stride = ShenandoahParallelRegionStride;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1376
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1377
    size_t max = _heap->num_regions();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1378
    while (_index < max) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1379
      size_t cur = Atomic::add(stride, &_index) - stride;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1380
      size_t start = cur;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1381
      size_t end = MIN2(cur + stride, max);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1382
      if (start >= max) break;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1383
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1384
      for (size_t i = cur; i < end; i++) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1385
        ShenandoahHeapRegion* current = _heap->get_region(i);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1386
        _blk->heap_region_do(current);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1387
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1388
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1389
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1390
};
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1391
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1392
void ShenandoahHeap::parallel_heap_region_iterate(ShenandoahHeapRegionClosure* blk) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1393
  assert(blk->is_thread_safe(), "Only thread-safe closures here");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1394
  if (num_regions() > ShenandoahParallelRegionStride) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1395
    ShenandoahParallelHeapRegionTask task(blk);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1396
    workers()->run_task(&task);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1397
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1398
    heap_region_iterate(blk);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1399
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1400
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1401
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1402
class ShenandoahClearLivenessClosure : public ShenandoahHeapRegionClosure {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1403
private:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1404
  ShenandoahMarkingContext* const _ctx;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1405
public:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1406
  ShenandoahClearLivenessClosure() : _ctx(ShenandoahHeap::heap()->marking_context()) {}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1407
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1408
  void heap_region_do(ShenandoahHeapRegion* r) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1409
    if (r->is_active()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1410
      r->clear_live_data();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1411
      _ctx->capture_top_at_mark_start(r);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1412
    } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1413
      assert(!r->has_live(), "Region " SIZE_FORMAT " should have no live data", r->region_number());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1414
      assert(_ctx->top_at_mark_start(r) == r->top(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1415
             "Region " SIZE_FORMAT " should already have correct TAMS", r->region_number());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1416
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1417
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1418
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1419
  bool is_thread_safe() { return true; }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1420
};
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1421
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1422
void ShenandoahHeap::op_init_mark() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1423
  assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Should be at safepoint");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1424
  assert(Thread::current()->is_VM_thread(), "can only do this in VMThread");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1425
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1426
  assert(marking_context()->is_bitmap_clear(), "need clear marking bitmap");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1427
  assert(!marking_context()->is_complete(), "should not be complete");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1428
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1429
  if (ShenandoahVerify) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1430
    verifier()->verify_before_concmark();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1431
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1432
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1433
  if (VerifyBeforeGC) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1434
    Universe::verify();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1435
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1436
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1437
  set_concurrent_mark_in_progress(true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1438
  // We need to reset all TLABs because we'd lose marks on all objects allocated in them.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1439
  {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1440
    ShenandoahGCPhase phase(ShenandoahPhaseTimings::make_parsable);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1441
    make_parsable(true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1442
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1443
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1444
  {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1445
    ShenandoahGCPhase phase(ShenandoahPhaseTimings::clear_liveness);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1446
    ShenandoahClearLivenessClosure clc;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1447
    parallel_heap_region_iterate(&clc);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1448
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1449
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1450
  // Make above changes visible to worker threads
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1451
  OrderAccess::fence();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1452
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1453
  concurrent_mark()->mark_roots(ShenandoahPhaseTimings::scan_roots);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1454
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1455
  if (UseTLAB) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1456
    ShenandoahGCPhase phase(ShenandoahPhaseTimings::resize_tlabs);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1457
    resize_tlabs();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1458
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1459
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1460
  if (ShenandoahPacing) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1461
    pacer()->setup_for_mark();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1462
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1463
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1464
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1465
void ShenandoahHeap::op_mark() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1466
  concurrent_mark()->mark_from_roots();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1467
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1468
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1469
class ShenandoahCompleteLivenessClosure : public ShenandoahHeapRegionClosure {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1470
private:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1471
  ShenandoahMarkingContext* const _ctx;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1472
public:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1473
  ShenandoahCompleteLivenessClosure() : _ctx(ShenandoahHeap::heap()->complete_marking_context()) {}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1474
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1475
  void heap_region_do(ShenandoahHeapRegion* r) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1476
    if (r->is_active()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1477
      HeapWord *tams = _ctx->top_at_mark_start(r);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1478
      HeapWord *top = r->top();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1479
      if (top > tams) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1480
        r->increase_live_data_alloc_words(pointer_delta(top, tams));
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1481
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1482
    } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1483
      assert(!r->has_live(), "Region " SIZE_FORMAT " should have no live data", r->region_number());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1484
      assert(_ctx->top_at_mark_start(r) == r->top(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1485
             "Region " SIZE_FORMAT " should have correct TAMS", r->region_number());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1486
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1487
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1488
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1489
  bool is_thread_safe() { return true; }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1490
};
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1491
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1492
void ShenandoahHeap::op_final_mark() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1493
  assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Should be at safepoint");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1494
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1495
  // It is critical that we
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1496
  // evacuate roots right after finishing marking, so that we don't
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1497
  // get unmarked objects in the roots.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1498
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1499
  if (!cancelled_gc()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1500
    concurrent_mark()->finish_mark_from_roots(/* full_gc = */ false);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1501
54687
df2b3565f343 8222992: Shenandoah: Pre-evacuate all roots
zgu
parents: 54678
diff changeset
  1502
    // Degen may be caused by failed evacuation of roots
df2b3565f343 8222992: Shenandoah: Pre-evacuate all roots
zgu
parents: 54678
diff changeset
  1503
    if (is_degenerated_gc_in_progress() && has_forwarded_objects()) {
df2b3565f343 8222992: Shenandoah: Pre-evacuate all roots
zgu
parents: 54678
diff changeset
  1504
      concurrent_mark()->update_roots(ShenandoahPhaseTimings::degen_gc_update_roots);
df2b3565f343 8222992: Shenandoah: Pre-evacuate all roots
zgu
parents: 54678
diff changeset
  1505
    }
df2b3565f343 8222992: Shenandoah: Pre-evacuate all roots
zgu
parents: 54678
diff changeset
  1506
df2b3565f343 8222992: Shenandoah: Pre-evacuate all roots
zgu
parents: 54678
diff changeset
  1507
    if (ShenandoahVerify) {
df2b3565f343 8222992: Shenandoah: Pre-evacuate all roots
zgu
parents: 54678
diff changeset
  1508
      verifier()->verify_roots_no_forwarded();
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1509
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1510
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1511
    stop_concurrent_marking();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1512
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1513
    {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1514
      ShenandoahGCPhase phase(ShenandoahPhaseTimings::complete_liveness);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1515
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1516
      // All allocations past TAMS are implicitly live, adjust the region data.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1517
      // Bitmaps/TAMS are swapped at this point, so we need to poll complete bitmap.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1518
      ShenandoahCompleteLivenessClosure cl;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1519
      parallel_heap_region_iterate(&cl);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1520
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1521
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1522
    {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1523
      ShenandoahGCPhase prepare_evac(ShenandoahPhaseTimings::prepare_evac);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1524
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1525
      make_parsable(true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1526
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1527
      trash_cset_regions();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1528
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1529
      {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1530
        ShenandoahHeapLocker locker(lock());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1531
        _collection_set->clear();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1532
        _free_set->clear();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1533
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1534
        heuristics()->choose_collection_set(_collection_set);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1535
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1536
        _free_set->rebuild();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1537
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1538
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1539
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1540
    // If collection set has candidates, start evacuation.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1541
    // Otherwise, bypass the rest of the cycle.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1542
    if (!collection_set()->is_empty()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1543
      ShenandoahGCPhase init_evac(ShenandoahPhaseTimings::init_evac);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1544
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1545
      if (ShenandoahVerify) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1546
        verifier()->verify_before_evacuation();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1547
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1548
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1549
      set_evacuation_in_progress(true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1550
      // From here on, we need to update references.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1551
      set_has_forwarded_objects(true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1552
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1553
      evacuate_and_update_roots();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1554
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1555
      if (ShenandoahPacing) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1556
        pacer()->setup_for_evac();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1557
      }
54463
b9c461c02f7c 8222130: Shenandoah should verify roots after pre-evacuation
shade
parents: 54457
diff changeset
  1558
b9c461c02f7c 8222130: Shenandoah should verify roots after pre-evacuation
shade
parents: 54457
diff changeset
  1559
      if (ShenandoahVerify) {
54687
df2b3565f343 8222992: Shenandoah: Pre-evacuate all roots
zgu
parents: 54678
diff changeset
  1560
        verifier()->verify_roots_no_forwarded();
54463
b9c461c02f7c 8222130: Shenandoah should verify roots after pre-evacuation
shade
parents: 54457
diff changeset
  1561
        verifier()->verify_during_evacuation();
b9c461c02f7c 8222130: Shenandoah should verify roots after pre-evacuation
shade
parents: 54457
diff changeset
  1562
      }
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1563
    } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1564
      if (ShenandoahVerify) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1565
        verifier()->verify_after_concmark();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1566
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1567
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1568
      if (VerifyAfterGC) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1569
        Universe::verify();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1570
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1571
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1572
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1573
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1574
    concurrent_mark()->cancel();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1575
    stop_concurrent_marking();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1576
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1577
    if (process_references()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1578
      // Abandon reference processing right away: pre-cleaning must have failed.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1579
      ReferenceProcessor *rp = ref_processor();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1580
      rp->disable_discovery();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1581
      rp->abandon_partial_discovery();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1582
      rp->verify_no_references_recorded();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1583
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1584
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1585
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1586
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1587
void ShenandoahHeap::op_final_evac() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1588
  assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Should be at safepoint");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1589
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1590
  set_evacuation_in_progress(false);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1591
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1592
  retire_and_reset_gclabs();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1593
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1594
  if (ShenandoahVerify) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1595
    verifier()->verify_after_evacuation();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1596
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1597
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1598
  if (VerifyAfterGC) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1599
    Universe::verify();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1600
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1601
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1602
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1603
void ShenandoahHeap::op_conc_evac() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1604
  ShenandoahEvacuationTask task(this, _collection_set, true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1605
  workers()->run_task(&task);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1606
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1607
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1608
void ShenandoahHeap::op_stw_evac() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1609
  ShenandoahEvacuationTask task(this, _collection_set, false);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1610
  workers()->run_task(&task);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1611
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1612
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1613
void ShenandoahHeap::op_updaterefs() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1614
  update_heap_references(true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1615
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1616
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1617
void ShenandoahHeap::op_cleanup() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1618
  free_set()->recycle_trash();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1619
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1620
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1621
void ShenandoahHeap::op_reset() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1622
  reset_mark_bitmap();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1623
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1624
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1625
void ShenandoahHeap::op_preclean() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1626
  concurrent_mark()->preclean_weak_refs();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1627
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1628
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1629
void ShenandoahHeap::op_init_traversal() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1630
  traversal_gc()->init_traversal_collection();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1631
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1632
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1633
void ShenandoahHeap::op_traversal() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1634
  traversal_gc()->concurrent_traversal_collection();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1635
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1636
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1637
void ShenandoahHeap::op_final_traversal() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1638
  traversal_gc()->final_traversal_collection();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1639
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1640
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1641
void ShenandoahHeap::op_full(GCCause::Cause cause) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1642
  ShenandoahMetricsSnapshot metrics;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1643
  metrics.snap_before();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1644
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1645
  full_gc()->do_it(cause);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1646
  if (UseTLAB) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1647
    ShenandoahGCPhase phase(ShenandoahPhaseTimings::full_gc_resize_tlabs);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1648
    resize_all_tlabs();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1649
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1650
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1651
  metrics.snap_after();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1652
  metrics.print();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1653
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1654
  if (metrics.is_good_progress("Full GC")) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1655
    _progress_last_gc.set();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1656
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1657
    // Nothing to do. Tell the allocation path that we have failed to make
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1658
    // progress, and it can finally fail.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1659
    _progress_last_gc.unset();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1660
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1661
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1662
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1663
void ShenandoahHeap::op_degenerated(ShenandoahDegenPoint point) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1664
  // Degenerated GC is STW, but it can also fail. Current mechanics communicates
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1665
  // GC failure via cancelled_concgc() flag. So, if we detect the failure after
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1666
  // some phase, we have to upgrade the Degenerate GC to Full GC.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1667
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1668
  clear_cancelled_gc();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1669
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1670
  ShenandoahMetricsSnapshot metrics;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1671
  metrics.snap_before();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1672
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1673
  switch (point) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1674
    case _degenerated_traversal:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1675
      {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1676
        // Drop the collection set. Note: this leaves some already forwarded objects
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1677
        // behind, which may be problematic, see comments for ShenandoahEvacAssist
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1678
        // workarounds in ShenandoahTraversalHeuristics.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1679
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1680
        ShenandoahHeapLocker locker(lock());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1681
        collection_set()->clear_current_index();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1682
        for (size_t i = 0; i < collection_set()->count(); i++) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1683
          ShenandoahHeapRegion* r = collection_set()->next();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1684
          r->make_regular_bypass();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1685
        }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1686
        collection_set()->clear();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1687
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1688
      op_final_traversal();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1689
      op_cleanup();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1690
      return;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1691
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1692
    // The cases below form the Duff's-like device: it describes the actual GC cycle,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1693
    // but enters it at different points, depending on which concurrent phase had
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1694
    // degenerated.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1695
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1696
    case _degenerated_outside_cycle:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1697
      // We have degenerated from outside the cycle, which means something is bad with
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1698
      // the heap, most probably heavy humongous fragmentation, or we are very low on free
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1699
      // space. It makes little sense to wait for Full GC to reclaim as much as it can, when
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1700
      // we can do the most aggressive degen cycle, which includes processing references and
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1701
      // class unloading, unless those features are explicitly disabled.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1702
      //
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1703
      // Note that we can only do this for "outside-cycle" degens, otherwise we would risk
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1704
      // changing the cycle parameters mid-cycle during concurrent -> degenerated handover.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1705
      set_process_references(heuristics()->can_process_references());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1706
      set_unload_classes(heuristics()->can_unload_classes());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1707
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1708
      if (heuristics()->can_do_traversal_gc()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1709
        // Not possible to degenerate from here, upgrade to Full GC right away.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1710
        cancel_gc(GCCause::_shenandoah_upgrade_to_full_gc);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1711
        op_degenerated_fail();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1712
        return;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1713
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1714
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1715
      op_reset();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1716
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1717
      op_init_mark();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1718
      if (cancelled_gc()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1719
        op_degenerated_fail();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1720
        return;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1721
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1722
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1723
    case _degenerated_mark:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1724
      op_final_mark();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1725
      if (cancelled_gc()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1726
        op_degenerated_fail();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1727
        return;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1728
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1729
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1730
      op_cleanup();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1731
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1732
    case _degenerated_evac:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1733
      // If heuristics thinks we should do the cycle, this flag would be set,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1734
      // and we can do evacuation. Otherwise, it would be the shortcut cycle.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1735
      if (is_evacuation_in_progress()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1736
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1737
        // Degeneration under oom-evac protocol might have left some objects in
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1738
        // collection set un-evacuated. Restart evacuation from the beginning to
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1739
        // capture all objects. For all the objects that are already evacuated,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1740
        // it would be a simple check, which is supposed to be fast. This is also
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1741
        // safe to do even without degeneration, as CSet iterator is at beginning
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1742
        // in preparation for evacuation anyway.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1743
        collection_set()->clear_current_index();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1744
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1745
        op_stw_evac();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1746
        if (cancelled_gc()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1747
          op_degenerated_fail();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1748
          return;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1749
        }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1750
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1751
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1752
      // If heuristics thinks we should do the cycle, this flag would be set,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1753
      // and we need to do update-refs. Otherwise, it would be the shortcut cycle.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1754
      if (has_forwarded_objects()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1755
        op_init_updaterefs();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1756
        if (cancelled_gc()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1757
          op_degenerated_fail();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1758
          return;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1759
        }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1760
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1761
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1762
    case _degenerated_updaterefs:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1763
      if (has_forwarded_objects()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1764
        op_final_updaterefs();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1765
        if (cancelled_gc()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1766
          op_degenerated_fail();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1767
          return;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1768
        }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1769
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1770
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1771
      op_cleanup();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1772
      break;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1773
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1774
    default:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1775
      ShouldNotReachHere();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1776
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1777
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1778
  if (ShenandoahVerify) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1779
    verifier()->verify_after_degenerated();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1780
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1781
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1782
  if (VerifyAfterGC) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1783
    Universe::verify();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1784
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1785
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1786
  metrics.snap_after();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1787
  metrics.print();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1788
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1789
  // Check for futility and fail. There is no reason to do several back-to-back Degenerated cycles,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1790
  // because that probably means the heap is overloaded and/or fragmented.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1791
  if (!metrics.is_good_progress("Degenerated GC")) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1792
    _progress_last_gc.unset();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1793
    cancel_gc(GCCause::_shenandoah_upgrade_to_full_gc);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1794
    op_degenerated_futile();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1795
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1796
    _progress_last_gc.set();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1797
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1798
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1799
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1800
void ShenandoahHeap::op_degenerated_fail() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1801
  log_info(gc)("Cannot finish degeneration, upgrading to Full GC");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1802
  shenandoah_policy()->record_degenerated_upgrade_to_full();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1803
  op_full(GCCause::_shenandoah_upgrade_to_full_gc);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1804
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1805
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1806
void ShenandoahHeap::op_degenerated_futile() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1807
  shenandoah_policy()->record_degenerated_upgrade_to_full();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1808
  op_full(GCCause::_shenandoah_upgrade_to_full_gc);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1809
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1810
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1811
void ShenandoahHeap::stop_concurrent_marking() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1812
  assert(is_concurrent_mark_in_progress(), "How else could we get here?");
54425
13c02cc7a6e5 8221848: Shenandoah: ArrayCopy post-barrier improvements
rkennke
parents: 54423
diff changeset
  1813
  set_concurrent_mark_in_progress(false);
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1814
  if (!cancelled_gc()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1815
    // If we needed to update refs, and concurrent marking has been cancelled,
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1816
    // we need to finish updating references.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1817
    set_has_forwarded_objects(false);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1818
    mark_complete_marking_context();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1819
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1820
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1821
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1822
void ShenandoahHeap::force_satb_flush_all_threads() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1823
  if (!is_concurrent_mark_in_progress() && !is_concurrent_traversal_in_progress()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1824
    // No need to flush SATBs
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1825
    return;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1826
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1827
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1828
  for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1829
    ShenandoahThreadLocalData::set_force_satb_flush(t, true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1830
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1831
  // The threads are not "acquiring" their thread-local data, but it does not
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1832
  // hurt to "release" the updates here anyway.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1833
  OrderAccess::fence();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1834
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1835
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1836
void ShenandoahHeap::set_gc_state_all_threads(char state) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1837
  for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1838
    ShenandoahThreadLocalData::set_gc_state(t, state);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1839
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1840
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1841
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1842
void ShenandoahHeap::set_gc_state_mask(uint mask, bool value) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1843
  assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Should really be Shenandoah safepoint");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1844
  _gc_state.set_cond(mask, value);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1845
  set_gc_state_all_threads(_gc_state.raw_value());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1846
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1847
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1848
void ShenandoahHeap::set_concurrent_mark_in_progress(bool in_progress) {
54425
13c02cc7a6e5 8221848: Shenandoah: ArrayCopy post-barrier improvements
rkennke
parents: 54423
diff changeset
  1849
  if (has_forwarded_objects()) {
13c02cc7a6e5 8221848: Shenandoah: ArrayCopy post-barrier improvements
rkennke
parents: 54423
diff changeset
  1850
    set_gc_state_mask(MARKING | UPDATEREFS, in_progress);
13c02cc7a6e5 8221848: Shenandoah: ArrayCopy post-barrier improvements
rkennke
parents: 54423
diff changeset
  1851
  } else {
13c02cc7a6e5 8221848: Shenandoah: ArrayCopy post-barrier improvements
rkennke
parents: 54423
diff changeset
  1852
    set_gc_state_mask(MARKING, in_progress);
13c02cc7a6e5 8221848: Shenandoah: ArrayCopy post-barrier improvements
rkennke
parents: 54423
diff changeset
  1853
  }
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1854
  ShenandoahBarrierSet::satb_mark_queue_set().set_active_all_threads(in_progress, !in_progress);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1855
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1856
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1857
void ShenandoahHeap::set_concurrent_traversal_in_progress(bool in_progress) {
54425
13c02cc7a6e5 8221848: Shenandoah: ArrayCopy post-barrier improvements
rkennke
parents: 54423
diff changeset
  1858
   set_gc_state_mask(TRAVERSAL | HAS_FORWARDED | UPDATEREFS, in_progress);
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1859
   ShenandoahBarrierSet::satb_mark_queue_set().set_active_all_threads(in_progress, !in_progress);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1860
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1861
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1862
void ShenandoahHeap::set_evacuation_in_progress(bool in_progress) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1863
  assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Only call this at safepoint");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1864
  set_gc_state_mask(EVACUATION, in_progress);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1865
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1866
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1867
HeapWord* ShenandoahHeap::tlab_post_allocation_setup(HeapWord* obj) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1868
  // Initialize Brooks pointer for the next object
54766
1321f8cf9de5 8223567: Rename ShenandoahBrooksPointer to ShenandoahForwarding
rkennke
parents: 54687
diff changeset
  1869
  HeapWord* result = obj + ShenandoahForwarding::word_size();
1321f8cf9de5 8223567: Rename ShenandoahBrooksPointer to ShenandoahForwarding
rkennke
parents: 54687
diff changeset
  1870
  ShenandoahForwarding::initialize(oop(result));
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1871
  return result;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1872
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1873
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1874
void ShenandoahHeap::ref_processing_init() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1875
  assert(_max_workers > 0, "Sanity");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1876
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1877
  _ref_processor =
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1878
    new ReferenceProcessor(&_subject_to_discovery,  // is_subject_to_discovery
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1879
                           ParallelRefProcEnabled,  // MT processing
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1880
                           _max_workers,            // Degree of MT processing
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1881
                           true,                    // MT discovery
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1882
                           _max_workers,            // Degree of MT discovery
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1883
                           false,                   // Reference discovery is not atomic
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1884
                           NULL,                    // No closure, should be installed before use
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1885
                           true);                   // Scale worker threads
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1886
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1887
  shenandoah_assert_rp_isalive_not_installed();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1888
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1889
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1890
GCTracer* ShenandoahHeap::tracer() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1891
  return shenandoah_policy()->tracer();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1892
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1893
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1894
size_t ShenandoahHeap::tlab_used(Thread* thread) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1895
  return _free_set->used();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1896
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1897
53582
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1898
bool ShenandoahHeap::try_cancel_gc() {
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1899
  while (true) {
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1900
    jbyte prev = _cancelled_gc.cmpxchg(CANCELLED, CANCELLABLE);
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1901
    if (prev == CANCELLABLE) return true;
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1902
    else if (prev == CANCELLED) return false;
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1903
    assert(ShenandoahSuspendibleWorkers, "should not get here when not using suspendible workers");
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1904
    assert(prev == NOT_CANCELLED, "must be NOT_CANCELLED");
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1905
    {
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1906
      // We need to provide a safepoint here, otherwise we might
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1907
      // spin forever if a SP is pending.
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1908
      ThreadBlockInVM sp(JavaThread::current());
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1909
      SpinPause();
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1910
    }
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1911
  }
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1912
}
881c5fbeb849 8218041: Assorted wrong/missing includes
rehn
parents: 53536
diff changeset
  1913
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1914
void ShenandoahHeap::cancel_gc(GCCause::Cause cause) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1915
  if (try_cancel_gc()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1916
    FormatBuffer<> msg("Cancelling GC: %s", GCCause::to_string(cause));
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1917
    log_info(gc)("%s", msg.buffer());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1918
    Events::log(Thread::current(), "%s", msg.buffer());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1919
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1920
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1921
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1922
uint ShenandoahHeap::max_workers() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1923
  return _max_workers;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1924
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1926
void ShenandoahHeap::stop() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1927
  // The shutdown sequence should be able to terminate when GC is running.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1928
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1929
  // Step 0. Notify policy to disable event recording.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1930
  _shenandoah_policy->record_shutdown();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1931
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1932
  // Step 1. Notify control thread that we are in shutdown.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1933
  // Note that we cannot do that with stop(), because stop() is blocking and waits for the actual shutdown.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1934
  // Doing stop() here would wait for the normal GC cycle to complete, never falling through to cancel below.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1935
  control_thread()->prepare_for_graceful_shutdown();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1936
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1937
  // Step 2. Notify GC workers that we are cancelling GC.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1938
  cancel_gc(GCCause::_shenandoah_stop_vm);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1939
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1940
  // Step 3. Wait until GC worker exits normally.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1941
  control_thread()->stop();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1942
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1943
  // Step 4. Stop String Dedup thread if it is active
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1944
  if (ShenandoahStringDedup::is_enabled()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1945
    ShenandoahStringDedup::stop();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1946
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1947
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1948
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1949
void ShenandoahHeap::unload_classes_and_cleanup_tables(bool full_gc) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1950
  assert(heuristics()->can_unload_classes(), "Class unloading should be enabled");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1951
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1952
  ShenandoahGCPhase root_phase(full_gc ?
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1953
                               ShenandoahPhaseTimings::full_gc_purge :
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1954
                               ShenandoahPhaseTimings::purge);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1955
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1956
  ShenandoahIsAliveSelector alive;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1957
  BoolObjectClosure* is_alive = alive.is_alive_closure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1958
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1959
  bool purged_class;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1960
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1961
  // Unload classes and purge SystemDictionary.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1962
  {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1963
    ShenandoahGCPhase phase(full_gc ?
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1964
                            ShenandoahPhaseTimings::full_gc_purge_class_unload :
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1965
                            ShenandoahPhaseTimings::purge_class_unload);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1966
    purged_class = SystemDictionary::do_unloading(gc_timer());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1967
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1968
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1969
  {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1970
    ShenandoahGCPhase phase(full_gc ?
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1971
                            ShenandoahPhaseTimings::full_gc_purge_par :
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1972
                            ShenandoahPhaseTimings::purge_par);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1973
    uint active = _workers->active_workers();
53536
482109fae02b 8213229: Investigate treating StringTable as weak in young collections
tschatzl
parents: 53383
diff changeset
  1974
    ParallelCleaningTask unlink_task(is_alive, active, purged_class, true);
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1975
    _workers->run_task(&unlink_task);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1976
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1977
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1978
  {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1979
    ShenandoahGCPhase phase(full_gc ?
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1980
                      ShenandoahPhaseTimings::full_gc_purge_cldg :
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1981
                      ShenandoahPhaseTimings::purge_cldg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1982
    ClassLoaderDataGraph::purge();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1983
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1984
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1985
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1986
void ShenandoahHeap::set_has_forwarded_objects(bool cond) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1987
  set_gc_state_mask(HAS_FORWARDED, cond);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1988
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1989
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1990
void ShenandoahHeap::set_process_references(bool pr) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1991
  _process_references.set_cond(pr);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1992
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1993
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1994
void ShenandoahHeap::set_unload_classes(bool uc) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1995
  _unload_classes.set_cond(uc);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1996
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1997
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1998
bool ShenandoahHeap::process_references() const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  1999
  return _process_references.is_set();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2000
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2001
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2002
bool ShenandoahHeap::unload_classes() const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2003
  return _unload_classes.is_set();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2004
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2005
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2006
address ShenandoahHeap::in_cset_fast_test_addr() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2007
  ShenandoahHeap* heap = ShenandoahHeap::heap();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2008
  assert(heap->collection_set() != NULL, "Sanity");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2009
  return (address) heap->collection_set()->biased_map_address();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2010
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2011
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2012
address ShenandoahHeap::cancelled_gc_addr() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2013
  return (address) ShenandoahHeap::heap()->_cancelled_gc.addr_of();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2014
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2015
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2016
address ShenandoahHeap::gc_state_addr() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2017
  return (address) ShenandoahHeap::heap()->_gc_state.addr_of();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2018
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2019
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2020
size_t ShenandoahHeap::bytes_allocated_since_gc_start() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2021
  return OrderAccess::load_acquire(&_bytes_allocated_since_gc_start);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2022
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2023
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2024
void ShenandoahHeap::reset_bytes_allocated_since_gc_start() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2025
  OrderAccess::release_store_fence(&_bytes_allocated_since_gc_start, (size_t)0);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2026
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2027
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2028
void ShenandoahHeap::set_degenerated_gc_in_progress(bool in_progress) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2029
  _degenerated_gc_in_progress.set_cond(in_progress);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2030
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2031
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2032
void ShenandoahHeap::set_full_gc_in_progress(bool in_progress) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2033
  _full_gc_in_progress.set_cond(in_progress);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2034
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2035
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2036
void ShenandoahHeap::set_full_gc_move_in_progress(bool in_progress) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2037
  assert (is_full_gc_in_progress(), "should be");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2038
  _full_gc_move_in_progress.set_cond(in_progress);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2039
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2040
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2041
void ShenandoahHeap::set_update_refs_in_progress(bool in_progress) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2042
  set_gc_state_mask(UPDATEREFS, in_progress);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2043
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2044
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2045
void ShenandoahHeap::register_nmethod(nmethod* nm) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2046
  ShenandoahCodeRoots::add_nmethod(nm);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2047
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2048
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2049
void ShenandoahHeap::unregister_nmethod(nmethod* nm) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2050
  ShenandoahCodeRoots::remove_nmethod(nm);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2051
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2052
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2053
oop ShenandoahHeap::pin_object(JavaThread* thr, oop o) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2054
  ShenandoahHeapLocker locker(lock());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2055
  heap_region_containing(o)->make_pinned();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2056
  return o;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2057
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2058
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2059
void ShenandoahHeap::unpin_object(JavaThread* thr, oop o) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2060
  ShenandoahHeapLocker locker(lock());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2061
  heap_region_containing(o)->make_unpinned();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2062
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2063
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2064
GCTimer* ShenandoahHeap::gc_timer() const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2065
  return _gc_timer;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2066
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2067
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2068
#ifdef ASSERT
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2069
void ShenandoahHeap::assert_gc_workers(uint nworkers) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2070
  assert(nworkers > 0 && nworkers <= max_workers(), "Sanity");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2071
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2072
  if (ShenandoahSafepoint::is_at_shenandoah_safepoint()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2073
    if (UseDynamicNumberOfGCThreads ||
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2074
        (FLAG_IS_DEFAULT(ParallelGCThreads) && ForceDynamicNumberOfGCThreads)) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2075
      assert(nworkers <= ParallelGCThreads, "Cannot use more than it has");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2076
    } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2077
      // Use ParallelGCThreads inside safepoints
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2078
      assert(nworkers == ParallelGCThreads, "Use ParalleGCThreads within safepoints");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2079
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2080
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2081
    if (UseDynamicNumberOfGCThreads ||
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2082
        (FLAG_IS_DEFAULT(ConcGCThreads) && ForceDynamicNumberOfGCThreads)) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2083
      assert(nworkers <= ConcGCThreads, "Cannot use more than it has");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2084
    } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2085
      // Use ConcGCThreads outside safepoints
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2086
      assert(nworkers == ConcGCThreads, "Use ConcGCThreads outside safepoints");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2087
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2088
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2089
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2090
#endif
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2091
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2092
ShenandoahVerifier* ShenandoahHeap::verifier() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2093
  guarantee(ShenandoahVerify, "Should be enabled");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2094
  assert (_verifier != NULL, "sanity");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2095
  return _verifier;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2096
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2097
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2098
template<class T>
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2099
class ShenandoahUpdateHeapRefsTask : public AbstractGangTask {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2100
private:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2101
  T cl;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2102
  ShenandoahHeap* _heap;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2103
  ShenandoahRegionIterator* _regions;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2104
  bool _concurrent;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2105
public:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2106
  ShenandoahUpdateHeapRefsTask(ShenandoahRegionIterator* regions, bool concurrent) :
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2107
    AbstractGangTask("Concurrent Update References Task"),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2108
    cl(T()),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2109
    _heap(ShenandoahHeap::heap()),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2110
    _regions(regions),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2111
    _concurrent(concurrent) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2112
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2113
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2114
  void work(uint worker_id) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2115
    if (_concurrent) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2116
      ShenandoahConcurrentWorkerSession worker_session(worker_id);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2117
      ShenandoahSuspendibleThreadSetJoiner stsj(ShenandoahSuspendibleWorkers);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2118
      do_work();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2119
    } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2120
      ShenandoahParallelWorkerSession worker_session(worker_id);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2121
      do_work();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2122
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2123
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2124
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2125
private:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2126
  void do_work() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2127
    ShenandoahHeapRegion* r = _regions->next();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2128
    ShenandoahMarkingContext* const ctx = _heap->complete_marking_context();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2129
    while (r != NULL) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2130
      HeapWord* top_at_start_ur = r->concurrent_iteration_safe_limit();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2131
      assert (top_at_start_ur >= r->bottom(), "sanity");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2132
      if (r->is_active() && !r->is_cset()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2133
        _heap->marked_object_oop_iterate(r, &cl, top_at_start_ur);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2134
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2135
      if (ShenandoahPacing) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2136
        _heap->pacer()->report_updaterefs(pointer_delta(top_at_start_ur, r->bottom()));
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2137
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2138
      if (_heap->check_cancelled_gc_and_yield(_concurrent)) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2139
        return;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2140
      }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2141
      r = _regions->next();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2142
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2143
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2144
};
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2145
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2146
void ShenandoahHeap::update_heap_references(bool concurrent) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2147
  ShenandoahUpdateHeapRefsTask<ShenandoahUpdateHeapRefsClosure> task(&_update_refs_iterator, concurrent);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2148
  workers()->run_task(&task);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2149
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2150
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2151
void ShenandoahHeap::op_init_updaterefs() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2152
  assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "must be at safepoint");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2153
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2154
  set_evacuation_in_progress(false);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2155
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2156
  retire_and_reset_gclabs();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2157
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2158
  if (ShenandoahVerify) {
54882
b99e97bc5040 8223215: Shenandoah: Support verifying subset of roots
zgu
parents: 54786
diff changeset
  2159
    if (!is_degenerated_gc_in_progress()) {
b99e97bc5040 8223215: Shenandoah: Support verifying subset of roots
zgu
parents: 54786
diff changeset
  2160
      verifier()->verify_roots_no_forwarded_except(ShenandoahRootVerifier::ThreadRoots);
b99e97bc5040 8223215: Shenandoah: Support verifying subset of roots
zgu
parents: 54786
diff changeset
  2161
    }
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2162
    verifier()->verify_before_updaterefs();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2163
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2164
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2165
  set_update_refs_in_progress(true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2166
  make_parsable(true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2167
  for (uint i = 0; i < num_regions(); i++) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2168
    ShenandoahHeapRegion* r = get_region(i);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2169
    r->set_concurrent_iteration_safe_limit(r->top());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2170
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2171
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2172
  // Reset iterator.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2173
  _update_refs_iterator.reset();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2174
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2175
  if (ShenandoahPacing) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2176
    pacer()->setup_for_updaterefs();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2177
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2178
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2179
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2180
void ShenandoahHeap::op_final_updaterefs() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2181
  assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "must be at safepoint");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2182
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2183
  // Check if there is left-over work, and finish it
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2184
  if (_update_refs_iterator.has_next()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2185
    ShenandoahGCPhase final_work(ShenandoahPhaseTimings::final_update_refs_finish_work);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2186
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2187
    // Finish updating references where we left off.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2188
    clear_cancelled_gc();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2189
    update_heap_references(false);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2190
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2191
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2192
  // Clear cancelled GC, if set. On cancellation path, the block before would handle
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2193
  // everything. On degenerated paths, cancelled gc would not be set anyway.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2194
  if (cancelled_gc()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2195
    clear_cancelled_gc();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2196
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2197
  assert(!cancelled_gc(), "Should have been done right before");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2198
54882
b99e97bc5040 8223215: Shenandoah: Support verifying subset of roots
zgu
parents: 54786
diff changeset
  2199
  if (ShenandoahVerify && !is_degenerated_gc_in_progress()) {
b99e97bc5040 8223215: Shenandoah: Support verifying subset of roots
zgu
parents: 54786
diff changeset
  2200
    verifier()->verify_roots_no_forwarded_except(ShenandoahRootVerifier::ThreadRoots);
b99e97bc5040 8223215: Shenandoah: Support verifying subset of roots
zgu
parents: 54786
diff changeset
  2201
  }
b99e97bc5040 8223215: Shenandoah: Support verifying subset of roots
zgu
parents: 54786
diff changeset
  2202
54928
fe4c2de90b59 8223951: Shenandoah: Only need to update thread roots during final update refs
zgu
parents: 54924
diff changeset
  2203
  if (is_degenerated_gc_in_progress()) {
fe4c2de90b59 8223951: Shenandoah: Only need to update thread roots during final update refs
zgu
parents: 54924
diff changeset
  2204
    concurrent_mark()->update_roots(ShenandoahPhaseTimings::degen_gc_update_roots);
fe4c2de90b59 8223951: Shenandoah: Only need to update thread roots during final update refs
zgu
parents: 54924
diff changeset
  2205
  } else {
fe4c2de90b59 8223951: Shenandoah: Only need to update thread roots during final update refs
zgu
parents: 54924
diff changeset
  2206
    concurrent_mark()->update_thread_roots(ShenandoahPhaseTimings::final_update_refs_roots);
fe4c2de90b59 8223951: Shenandoah: Only need to update thread roots during final update refs
zgu
parents: 54924
diff changeset
  2207
  }
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2208
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2209
  ShenandoahGCPhase final_update_refs(ShenandoahPhaseTimings::final_update_refs_recycle);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2210
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2211
  trash_cset_regions();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2212
  set_has_forwarded_objects(false);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2213
  set_update_refs_in_progress(false);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2214
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2215
  if (ShenandoahVerify) {
54687
df2b3565f343 8222992: Shenandoah: Pre-evacuate all roots
zgu
parents: 54678
diff changeset
  2216
    verifier()->verify_roots_no_forwarded();
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2217
    verifier()->verify_after_updaterefs();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2218
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2219
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2220
  if (VerifyAfterGC) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2221
    Universe::verify();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2222
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2223
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2224
  {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2225
    ShenandoahHeapLocker locker(lock());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2226
    _free_set->rebuild();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2227
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2228
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2229
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2230
#ifdef ASSERT
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2231
void ShenandoahHeap::assert_heaplock_owned_by_current_thread() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2232
  _lock.assert_owned_by_current_thread();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2233
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2234
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2235
void ShenandoahHeap::assert_heaplock_not_owned_by_current_thread() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2236
  _lock.assert_not_owned_by_current_thread();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2237
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2238
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2239
void ShenandoahHeap::assert_heaplock_or_safepoint() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2240
  _lock.assert_owned_by_current_thread_or_safepoint();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2241
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2242
#endif
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2243
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2244
void ShenandoahHeap::print_extended_on(outputStream *st) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2245
  print_on(st);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2246
  print_heap_regions_on(st);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2247
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2248
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2249
bool ShenandoahHeap::is_bitmap_slice_committed(ShenandoahHeapRegion* r, bool skip_self) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2250
  size_t slice = r->region_number() / _bitmap_regions_per_slice;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2251
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2252
  size_t regions_from = _bitmap_regions_per_slice * slice;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2253
  size_t regions_to   = MIN2(num_regions(), _bitmap_regions_per_slice * (slice + 1));
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2254
  for (size_t g = regions_from; g < regions_to; g++) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2255
    assert (g / _bitmap_regions_per_slice == slice, "same slice");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2256
    if (skip_self && g == r->region_number()) continue;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2257
    if (get_region(g)->is_committed()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2258
      return true;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2259
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2260
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2261
  return false;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2262
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2263
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2264
bool ShenandoahHeap::commit_bitmap_slice(ShenandoahHeapRegion* r) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2265
  assert_heaplock_owned_by_current_thread();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2266
54047
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
  2267
  // Bitmaps in special regions do not need commits
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
  2268
  if (_bitmap_region_special) {
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
  2269
    return true;
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
  2270
  }
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
  2271
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2272
  if (is_bitmap_slice_committed(r, true)) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2273
    // Some other region from the group is already committed, meaning the bitmap
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2274
    // slice is already committed, we exit right away.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2275
    return true;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2276
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2277
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2278
  // Commit the bitmap slice:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2279
  size_t slice = r->region_number() / _bitmap_regions_per_slice;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2280
  size_t off = _bitmap_bytes_per_slice * slice;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2281
  size_t len = _bitmap_bytes_per_slice;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2282
  if (!os::commit_memory((char*)_bitmap_region.start() + off, len, false)) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2283
    return false;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2284
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2285
  return true;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2286
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2287
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2288
bool ShenandoahHeap::uncommit_bitmap_slice(ShenandoahHeapRegion *r) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2289
  assert_heaplock_owned_by_current_thread();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2290
54047
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
  2291
  // Bitmaps in special regions do not need uncommits
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
  2292
  if (_bitmap_region_special) {
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
  2293
    return true;
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
  2294
  }
0a9cb99a98a0 8220162: Shenandoah should not commit HugeTLBFS memory
shade
parents: 54046
diff changeset
  2295
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2296
  if (is_bitmap_slice_committed(r, true)) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2297
    // Some other region from the group is still committed, meaning the bitmap
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2298
    // slice is should stay committed, exit right away.
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2299
    return true;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2300
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2301
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2302
  // Uncommit the bitmap slice:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2303
  size_t slice = r->region_number() / _bitmap_regions_per_slice;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2304
  size_t off = _bitmap_bytes_per_slice * slice;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2305
  size_t len = _bitmap_bytes_per_slice;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2306
  if (!os::uncommit_memory((char*)_bitmap_region.start() + off, len)) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2307
    return false;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2308
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2309
  return true;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2310
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2311
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2312
void ShenandoahHeap::safepoint_synchronize_begin() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2313
  if (ShenandoahSuspendibleWorkers || UseStringDeduplication) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2314
    SuspendibleThreadSet::synchronize();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2315
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2316
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2317
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2318
void ShenandoahHeap::safepoint_synchronize_end() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2319
  if (ShenandoahSuspendibleWorkers || UseStringDeduplication) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2320
    SuspendibleThreadSet::desynchronize();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2321
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2322
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2323
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2324
void ShenandoahHeap::vmop_entry_init_mark() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2325
  TraceCollectorStats tcs(monitoring_support()->stw_collection_counters());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2326
  ShenandoahGCPhase total(ShenandoahPhaseTimings::total_pause_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2327
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::init_mark_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2328
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2329
  try_inject_alloc_failure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2330
  VM_ShenandoahInitMark op;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2331
  VMThread::execute(&op); // jump to entry_init_mark() under safepoint
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2332
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2333
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2334
void ShenandoahHeap::vmop_entry_final_mark() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2335
  TraceCollectorStats tcs(monitoring_support()->stw_collection_counters());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2336
  ShenandoahGCPhase total(ShenandoahPhaseTimings::total_pause_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2337
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::final_mark_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2338
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2339
  try_inject_alloc_failure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2340
  VM_ShenandoahFinalMarkStartEvac op;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2341
  VMThread::execute(&op); // jump to entry_final_mark under safepoint
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2342
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2343
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2344
void ShenandoahHeap::vmop_entry_final_evac() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2345
  TraceCollectorStats tcs(monitoring_support()->stw_collection_counters());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2346
  ShenandoahGCPhase total(ShenandoahPhaseTimings::total_pause_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2347
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::final_evac_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2348
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2349
  VM_ShenandoahFinalEvac op;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2350
  VMThread::execute(&op); // jump to entry_final_evac under safepoint
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2351
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2352
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2353
void ShenandoahHeap::vmop_entry_init_updaterefs() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2354
  TraceCollectorStats tcs(monitoring_support()->stw_collection_counters());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2355
  ShenandoahGCPhase total(ShenandoahPhaseTimings::total_pause_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2356
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::init_update_refs_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2357
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2358
  try_inject_alloc_failure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2359
  VM_ShenandoahInitUpdateRefs op;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2360
  VMThread::execute(&op);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2361
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2362
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2363
void ShenandoahHeap::vmop_entry_final_updaterefs() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2364
  TraceCollectorStats tcs(monitoring_support()->stw_collection_counters());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2365
  ShenandoahGCPhase total(ShenandoahPhaseTimings::total_pause_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2366
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::final_update_refs_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2367
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2368
  try_inject_alloc_failure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2369
  VM_ShenandoahFinalUpdateRefs op;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2370
  VMThread::execute(&op);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2371
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2372
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2373
void ShenandoahHeap::vmop_entry_init_traversal() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2374
  TraceCollectorStats tcs(monitoring_support()->stw_collection_counters());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2375
  ShenandoahGCPhase total(ShenandoahPhaseTimings::total_pause_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2376
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::init_traversal_gc_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2377
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2378
  try_inject_alloc_failure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2379
  VM_ShenandoahInitTraversalGC op;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2380
  VMThread::execute(&op);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2381
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2382
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2383
void ShenandoahHeap::vmop_entry_final_traversal() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2384
  TraceCollectorStats tcs(monitoring_support()->stw_collection_counters());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2385
  ShenandoahGCPhase total(ShenandoahPhaseTimings::total_pause_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2386
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::final_traversal_gc_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2387
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2388
  try_inject_alloc_failure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2389
  VM_ShenandoahFinalTraversalGC op;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2390
  VMThread::execute(&op);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2391
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2392
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2393
void ShenandoahHeap::vmop_entry_full(GCCause::Cause cause) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2394
  TraceCollectorStats tcs(monitoring_support()->full_stw_collection_counters());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2395
  ShenandoahGCPhase total(ShenandoahPhaseTimings::total_pause_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2396
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::full_gc_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2397
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2398
  try_inject_alloc_failure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2399
  VM_ShenandoahFullGC op(cause);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2400
  VMThread::execute(&op);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2401
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2402
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2403
void ShenandoahHeap::vmop_degenerated(ShenandoahDegenPoint point) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2404
  TraceCollectorStats tcs(monitoring_support()->full_stw_collection_counters());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2405
  ShenandoahGCPhase total(ShenandoahPhaseTimings::total_pause_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2406
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::degen_gc_gross);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2407
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2408
  VM_ShenandoahDegeneratedGC degenerated_gc((int)point);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2409
  VMThread::execute(&degenerated_gc);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2410
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2411
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2412
void ShenandoahHeap::entry_init_mark() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2413
  ShenandoahGCPhase total_phase(ShenandoahPhaseTimings::total_pause);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2414
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::init_mark);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2415
  const char* msg = init_mark_event_message();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2416
  GCTraceTime(Info, gc) time(msg, gc_timer());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2417
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2418
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2419
  ShenandoahWorkerScope scope(workers(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2420
                              ShenandoahWorkerPolicy::calc_workers_for_init_marking(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2421
                              "init marking");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2422
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2423
  op_init_mark();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2424
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2425
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2426
void ShenandoahHeap::entry_final_mark() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2427
  ShenandoahGCPhase total_phase(ShenandoahPhaseTimings::total_pause);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2428
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::final_mark);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2429
  const char* msg = final_mark_event_message();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2430
  GCTraceTime(Info, gc) time(msg, gc_timer());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2431
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2432
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2433
  ShenandoahWorkerScope scope(workers(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2434
                              ShenandoahWorkerPolicy::calc_workers_for_final_marking(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2435
                              "final marking");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2436
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2437
  op_final_mark();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2438
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2439
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2440
void ShenandoahHeap::entry_final_evac() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2441
  ShenandoahGCPhase total_phase(ShenandoahPhaseTimings::total_pause);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2442
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::final_evac);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2443
  static const char* msg = "Pause Final Evac";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2444
  GCTraceTime(Info, gc) time(msg, gc_timer());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2445
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2446
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2447
  op_final_evac();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2448
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2449
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2450
void ShenandoahHeap::entry_init_updaterefs() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2451
  ShenandoahGCPhase total_phase(ShenandoahPhaseTimings::total_pause);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2452
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::init_update_refs);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2453
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2454
  static const char* msg = "Pause Init Update Refs";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2455
  GCTraceTime(Info, gc) time(msg, gc_timer());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2456
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2457
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2458
  // No workers used in this phase, no setup required
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2459
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2460
  op_init_updaterefs();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2461
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2462
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2463
void ShenandoahHeap::entry_final_updaterefs() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2464
  ShenandoahGCPhase total_phase(ShenandoahPhaseTimings::total_pause);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2465
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::final_update_refs);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2466
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2467
  static const char* msg = "Pause Final Update Refs";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2468
  GCTraceTime(Info, gc) time(msg, gc_timer());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2469
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2470
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2471
  ShenandoahWorkerScope scope(workers(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2472
                              ShenandoahWorkerPolicy::calc_workers_for_final_update_ref(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2473
                              "final reference update");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2474
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2475
  op_final_updaterefs();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2476
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2477
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2478
void ShenandoahHeap::entry_init_traversal() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2479
  ShenandoahGCPhase total_phase(ShenandoahPhaseTimings::total_pause);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2480
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::init_traversal_gc);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2481
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2482
  static const char* msg = "Pause Init Traversal";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2483
  GCTraceTime(Info, gc) time(msg, gc_timer());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2484
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2485
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2486
  ShenandoahWorkerScope scope(workers(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2487
                              ShenandoahWorkerPolicy::calc_workers_for_stw_traversal(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2488
                              "init traversal");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2489
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2490
  op_init_traversal();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2491
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2492
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2493
void ShenandoahHeap::entry_final_traversal() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2494
  ShenandoahGCPhase total_phase(ShenandoahPhaseTimings::total_pause);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2495
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::final_traversal_gc);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2496
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2497
  static const char* msg = "Pause Final Traversal";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2498
  GCTraceTime(Info, gc) time(msg, gc_timer());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2499
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2500
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2501
  ShenandoahWorkerScope scope(workers(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2502
                              ShenandoahWorkerPolicy::calc_workers_for_stw_traversal(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2503
                              "final traversal");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2504
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2505
  op_final_traversal();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2506
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2507
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2508
void ShenandoahHeap::entry_full(GCCause::Cause cause) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2509
  ShenandoahGCPhase total_phase(ShenandoahPhaseTimings::total_pause);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2510
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::full_gc);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2511
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2512
  static const char* msg = "Pause Full";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2513
  GCTraceTime(Info, gc) time(msg, gc_timer(), cause, true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2514
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2515
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2516
  ShenandoahWorkerScope scope(workers(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2517
                              ShenandoahWorkerPolicy::calc_workers_for_fullgc(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2518
                              "full gc");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2519
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2520
  op_full(cause);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2521
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2522
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2523
void ShenandoahHeap::entry_degenerated(int point) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2524
  ShenandoahGCPhase total_phase(ShenandoahPhaseTimings::total_pause);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2525
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::degen_gc);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2526
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2527
  ShenandoahDegenPoint dpoint = (ShenandoahDegenPoint)point;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2528
  const char* msg = degen_event_message(dpoint);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2529
  GCTraceTime(Info, gc) time(msg, NULL, GCCause::_no_gc, true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2530
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2531
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2532
  ShenandoahWorkerScope scope(workers(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2533
                              ShenandoahWorkerPolicy::calc_workers_for_stw_degenerated(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2534
                              "stw degenerated gc");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2535
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2536
  set_degenerated_gc_in_progress(true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2537
  op_degenerated(dpoint);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2538
  set_degenerated_gc_in_progress(false);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2539
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2540
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2541
void ShenandoahHeap::entry_mark() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2542
  TraceCollectorStats tcs(monitoring_support()->concurrent_collection_counters());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2543
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2544
  const char* msg = conc_mark_event_message();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2545
  GCTraceTime(Info, gc) time(msg, NULL, GCCause::_no_gc, true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2546
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2547
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2548
  ShenandoahWorkerScope scope(workers(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2549
                              ShenandoahWorkerPolicy::calc_workers_for_conc_marking(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2550
                              "concurrent marking");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2551
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2552
  try_inject_alloc_failure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2553
  op_mark();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2554
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2555
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2556
void ShenandoahHeap::entry_evac() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2557
  ShenandoahGCPhase conc_evac_phase(ShenandoahPhaseTimings::conc_evac);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2558
  TraceCollectorStats tcs(monitoring_support()->concurrent_collection_counters());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2559
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2560
  static const char* msg = "Concurrent evacuation";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2561
  GCTraceTime(Info, gc) time(msg, NULL, GCCause::_no_gc, true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2562
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2563
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2564
  ShenandoahWorkerScope scope(workers(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2565
                              ShenandoahWorkerPolicy::calc_workers_for_conc_evac(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2566
                              "concurrent evacuation");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2567
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2568
  try_inject_alloc_failure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2569
  op_conc_evac();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2570
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2571
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2572
void ShenandoahHeap::entry_updaterefs() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2573
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::conc_update_refs);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2574
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2575
  static const char* msg = "Concurrent update references";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2576
  GCTraceTime(Info, gc) time(msg, NULL, GCCause::_no_gc, true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2577
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2578
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2579
  ShenandoahWorkerScope scope(workers(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2580
                              ShenandoahWorkerPolicy::calc_workers_for_conc_update_ref(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2581
                              "concurrent reference update");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2582
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2583
  try_inject_alloc_failure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2584
  op_updaterefs();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2585
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2586
void ShenandoahHeap::entry_cleanup() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2587
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::conc_cleanup);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2588
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2589
  static const char* msg = "Concurrent cleanup";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2590
  GCTraceTime(Info, gc) time(msg, NULL, GCCause::_no_gc, true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2591
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2592
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2593
  // This phase does not use workers, no need for setup
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2594
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2595
  try_inject_alloc_failure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2596
  op_cleanup();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2597
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2598
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2599
void ShenandoahHeap::entry_reset() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2600
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::conc_reset);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2601
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2602
  static const char* msg = "Concurrent reset";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2603
  GCTraceTime(Info, gc) time(msg, NULL, GCCause::_no_gc, true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2604
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2605
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2606
  ShenandoahWorkerScope scope(workers(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2607
                              ShenandoahWorkerPolicy::calc_workers_for_conc_reset(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2608
                              "concurrent reset");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2609
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2610
  try_inject_alloc_failure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2611
  op_reset();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2612
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2613
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2614
void ShenandoahHeap::entry_preclean() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2615
  if (ShenandoahPreclean && process_references()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2616
    static const char* msg = "Concurrent precleaning";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2617
    GCTraceTime(Info, gc) time(msg, NULL, GCCause::_no_gc, true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2618
    EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2619
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2620
    ShenandoahGCPhase conc_preclean(ShenandoahPhaseTimings::conc_preclean);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2621
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2622
    ShenandoahWorkerScope scope(workers(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2623
                                ShenandoahWorkerPolicy::calc_workers_for_conc_preclean(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2624
                                "concurrent preclean",
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2625
                                /* check_workers = */ false);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2626
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2627
    try_inject_alloc_failure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2628
    op_preclean();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2629
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2630
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2631
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2632
void ShenandoahHeap::entry_traversal() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2633
  static const char* msg = "Concurrent traversal";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2634
  GCTraceTime(Info, gc) time(msg, NULL, GCCause::_no_gc, true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2635
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2636
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2637
  TraceCollectorStats tcs(monitoring_support()->concurrent_collection_counters());
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2638
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2639
  ShenandoahWorkerScope scope(workers(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2640
                              ShenandoahWorkerPolicy::calc_workers_for_conc_traversal(),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2641
                              "concurrent traversal");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2642
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2643
  try_inject_alloc_failure();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2644
  op_traversal();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2645
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2646
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2647
void ShenandoahHeap::entry_uncommit(double shrink_before) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2648
  static const char *msg = "Concurrent uncommit";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2649
  GCTraceTime(Info, gc) time(msg, NULL, GCCause::_no_gc, true);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2650
  EventMark em("%s", msg);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2651
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2652
  ShenandoahGCPhase phase(ShenandoahPhaseTimings::conc_uncommit);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2653
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2654
  op_uncommit(shrink_before);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2655
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2656
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2657
void ShenandoahHeap::try_inject_alloc_failure() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2658
  if (ShenandoahAllocFailureALot && !cancelled_gc() && ((os::random() % 1000) > 950)) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2659
    _inject_alloc_failure.set();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2660
    os::naked_short_sleep(1);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2661
    if (cancelled_gc()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2662
      log_info(gc)("Allocation failure was successfully injected");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2663
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2664
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2665
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2666
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2667
bool ShenandoahHeap::should_inject_alloc_failure() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2668
  return _inject_alloc_failure.is_set() && _inject_alloc_failure.try_unset();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2669
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2670
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2671
void ShenandoahHeap::initialize_serviceability() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2672
  _memory_pool = new ShenandoahMemoryPool(this);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2673
  _cycle_memory_manager.add_pool(_memory_pool);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2674
  _stw_memory_manager.add_pool(_memory_pool);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2675
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2676
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2677
GrowableArray<GCMemoryManager*> ShenandoahHeap::memory_managers() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2678
  GrowableArray<GCMemoryManager*> memory_managers(2);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2679
  memory_managers.append(&_cycle_memory_manager);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2680
  memory_managers.append(&_stw_memory_manager);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2681
  return memory_managers;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2682
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2683
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2684
GrowableArray<MemoryPool*> ShenandoahHeap::memory_pools() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2685
  GrowableArray<MemoryPool*> memory_pools(1);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2686
  memory_pools.append(_memory_pool);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2687
  return memory_pools;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2688
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2689
53873
5cf6623b1283 8219524: Shenandoah misreports "committed" size in MemoryMXBean
shade
parents: 53582
diff changeset
  2690
MemoryUsage ShenandoahHeap::memory_usage() {
5cf6623b1283 8219524: Shenandoah misreports "committed" size in MemoryMXBean
shade
parents: 53582
diff changeset
  2691
  return _memory_pool->get_memory_usage();
5cf6623b1283 8219524: Shenandoah misreports "committed" size in MemoryMXBean
shade
parents: 53582
diff changeset
  2692
}
5cf6623b1283 8219524: Shenandoah misreports "committed" size in MemoryMXBean
shade
parents: 53582
diff changeset
  2693
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2694
void ShenandoahHeap::enter_evacuation() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2695
  _oom_evac_handler.enter_evacuation();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2696
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2697
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2698
void ShenandoahHeap::leave_evacuation() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2699
  _oom_evac_handler.leave_evacuation();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2700
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2701
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2702
ShenandoahRegionIterator::ShenandoahRegionIterator() :
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2703
  _heap(ShenandoahHeap::heap()),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2704
  _index(0) {}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2705
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2706
ShenandoahRegionIterator::ShenandoahRegionIterator(ShenandoahHeap* heap) :
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2707
  _heap(heap),
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2708
  _index(0) {}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2709
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2710
void ShenandoahRegionIterator::reset() {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2711
  _index = 0;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2712
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2713
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2714
bool ShenandoahRegionIterator::has_next() const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2715
  return _index < _heap->num_regions();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2716
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2717
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2718
char ShenandoahHeap::gc_state() const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2719
  return _gc_state.raw_value();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2720
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2721
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2722
void ShenandoahHeap::deduplicate_string(oop str) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2723
  assert(java_lang_String::is_instance(str), "invariant");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2724
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2725
  if (ShenandoahStringDedup::is_enabled()) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2726
    ShenandoahStringDedup::deduplicate(str);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2727
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2728
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2729
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2730
const char* ShenandoahHeap::init_mark_event_message() const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2731
  bool update_refs = has_forwarded_objects();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2732
  bool proc_refs = process_references();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2733
  bool unload_cls = unload_classes();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2734
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2735
  if (update_refs && proc_refs && unload_cls) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2736
    return "Pause Init Mark (update refs) (process weakrefs) (unload classes)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2737
  } else if (update_refs && proc_refs) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2738
    return "Pause Init Mark (update refs) (process weakrefs)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2739
  } else if (update_refs && unload_cls) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2740
    return "Pause Init Mark (update refs) (unload classes)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2741
  } else if (proc_refs && unload_cls) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2742
    return "Pause Init Mark (process weakrefs) (unload classes)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2743
  } else if (update_refs) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2744
    return "Pause Init Mark (update refs)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2745
  } else if (proc_refs) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2746
    return "Pause Init Mark (process weakrefs)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2747
  } else if (unload_cls) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2748
    return "Pause Init Mark (unload classes)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2749
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2750
    return "Pause Init Mark";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2751
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2752
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2753
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2754
const char* ShenandoahHeap::final_mark_event_message() const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2755
  bool update_refs = has_forwarded_objects();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2756
  bool proc_refs = process_references();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2757
  bool unload_cls = unload_classes();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2758
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2759
  if (update_refs && proc_refs && unload_cls) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2760
    return "Pause Final Mark (update refs) (process weakrefs) (unload classes)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2761
  } else if (update_refs && proc_refs) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2762
    return "Pause Final Mark (update refs) (process weakrefs)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2763
  } else if (update_refs && unload_cls) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2764
    return "Pause Final Mark (update refs) (unload classes)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2765
  } else if (proc_refs && unload_cls) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2766
    return "Pause Final Mark (process weakrefs) (unload classes)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2767
  } else if (update_refs) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2768
    return "Pause Final Mark (update refs)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2769
  } else if (proc_refs) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2770
    return "Pause Final Mark (process weakrefs)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2771
  } else if (unload_cls) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2772
    return "Pause Final Mark (unload classes)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2773
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2774
    return "Pause Final Mark";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2775
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2776
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2777
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2778
const char* ShenandoahHeap::conc_mark_event_message() const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2779
  bool update_refs = has_forwarded_objects();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2780
  bool proc_refs = process_references();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2781
  bool unload_cls = unload_classes();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2782
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2783
  if (update_refs && proc_refs && unload_cls) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2784
    return "Concurrent marking (update refs) (process weakrefs) (unload classes)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2785
  } else if (update_refs && proc_refs) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2786
    return "Concurrent marking (update refs) (process weakrefs)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2787
  } else if (update_refs && unload_cls) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2788
    return "Concurrent marking (update refs) (unload classes)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2789
  } else if (proc_refs && unload_cls) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2790
    return "Concurrent marking (process weakrefs) (unload classes)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2791
  } else if (update_refs) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2792
    return "Concurrent marking (update refs)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2793
  } else if (proc_refs) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2794
    return "Concurrent marking (process weakrefs)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2795
  } else if (unload_cls) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2796
    return "Concurrent marking (unload classes)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2797
  } else {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2798
    return "Concurrent marking";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2799
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2800
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2801
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2802
const char* ShenandoahHeap::degen_event_message(ShenandoahDegenPoint point) const {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2803
  switch (point) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2804
    case _degenerated_unset:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2805
      return "Pause Degenerated GC (<UNSET>)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2806
    case _degenerated_traversal:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2807
      return "Pause Degenerated GC (Traversal)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2808
    case _degenerated_outside_cycle:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2809
      return "Pause Degenerated GC (Outside of Cycle)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2810
    case _degenerated_mark:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2811
      return "Pause Degenerated GC (Mark)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2812
    case _degenerated_evac:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2813
      return "Pause Degenerated GC (Evacuation)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2814
    case _degenerated_updaterefs:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2815
      return "Pause Degenerated GC (Update Refs)";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2816
    default:
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2817
      ShouldNotReachHere();
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2818
      return "ERROR";
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2819
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2820
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2821
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2822
jushort* ShenandoahHeap::get_liveness_cache(uint worker_id) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2823
#ifdef ASSERT
54045
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
  2824
  assert(_liveness_cache != NULL, "sanity");
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2825
  assert(worker_id < _max_workers, "sanity");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2826
  for (uint i = 0; i < num_regions(); i++) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2827
    assert(_liveness_cache[worker_id][i] == 0, "liveness cache should be empty");
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2828
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2829
#endif
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2830
  return _liveness_cache[worker_id];
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2831
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2832
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2833
void ShenandoahHeap::flush_liveness_cache(uint worker_id) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2834
  assert(worker_id < _max_workers, "sanity");
54045
c97c87e96897 8220350: Refactor ShenandoahHeap::initialize
shade
parents: 54006
diff changeset
  2835
  assert(_liveness_cache != NULL, "sanity");
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2836
  jushort* ld = _liveness_cache[worker_id];
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2837
  for (uint i = 0; i < num_regions(); i++) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2838
    ShenandoahHeapRegion* r = get_region(i);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2839
    jushort live = ld[i];
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2840
    if (live > 0) {
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2841
      r->increase_live_data_gc_words(live);
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2842
      ld[i] = 0;
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2843
    }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2844
  }
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2845
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2846
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2847
size_t ShenandoahHeap::obj_size(oop obj) const {
54766
1321f8cf9de5 8223567: Rename ShenandoahBrooksPointer to ShenandoahForwarding
rkennke
parents: 54687
diff changeset
  2848
  return CollectedHeap::obj_size(obj) + ShenandoahForwarding::word_size();
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2849
}
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2850
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2851
ptrdiff_t ShenandoahHeap::cell_header_size() const {
54766
1321f8cf9de5 8223567: Rename ShenandoahBrooksPointer to ShenandoahForwarding
rkennke
parents: 54687
diff changeset
  2852
  return ShenandoahForwarding::byte_size();
52925
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff changeset
  2853
}