src/hotspot/share/gc/epsilon/epsilonHeap.cpp
author shade
Thu, 30 Nov 2017 18:51:47 +0100
branchepsilon-gc-branch
changeset 55939 c5c3e1a5c3f0
parent 55767 src/hotspot/share/gc/epsilon/epsilonCollectedHeap.cpp@8e22715afabc
child 55974 06122633fead
permissions -rw-r--r--
Rename EpsilonCollectedHeap to EpsilonHeap.
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/*
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 * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
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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 "gc/epsilon/epsilonHeap.hpp"
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jint EpsilonHeap::initialize() {
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  CollectedHeap::pre_initialize();
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  size_t init_byte_size = _policy->initial_heap_byte_size();
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  size_t max_byte_size = _policy->max_heap_byte_size();
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  size_t align = _policy->heap_alignment();
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  ReservedSpace heap_rs = Universe::reserve_heap(max_byte_size,  align);
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  _virtual_space.initialize(heap_rs, init_byte_size);
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  MemRegion committed_region((HeapWord*)_virtual_space.low(), (HeapWord*)_virtual_space.high());
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  MemRegion reserved_region((HeapWord*)_virtual_space.low_boundary(), (HeapWord*)_virtual_space.high_boundary());
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  initialize_reserved_region(reserved_region.start(), reserved_region.end());
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  _space = new ContiguousSpace();
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  _space->initialize(committed_region, true, true);
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  EpsilonBarrierSet* bs = new EpsilonBarrierSet();
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  set_barrier_set(bs);
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  _max_tlab_size = MIN2(CollectedHeap::max_tlab_size(), EpsilonMaxTLABSize / HeapWordSize);
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  _monitoring_support = new EpsilonMonitoringSupport(this);
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  _last_counter_update = 0;
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  if (init_byte_size != max_byte_size) {
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    log_info(gc)("Initialized with " SIZE_FORMAT "M heap, resizeable to up to " SIZE_FORMAT "M heap with " SIZE_FORMAT "M steps",
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                 init_byte_size / M, max_byte_size / M, EpsilonMinHeapExpand / M);
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  } else {
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    log_info(gc)("Initialized with " SIZE_FORMAT "M non-resizeable heap", init_byte_size / M);
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  }
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  if (UseTLAB) {
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    log_info(gc)("Using TLAB allocation; min: " SIZE_FORMAT "K, max: " SIZE_FORMAT "K",
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                                ThreadLocalAllocBuffer::min_size()*HeapWordSize / K,
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                                _max_tlab_size*HeapWordSize / K);
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  } else {
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    log_info(gc)("Not using TLAB allocation");
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  }
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  return JNI_OK;
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}
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size_t EpsilonHeap::unsafe_max_tlab_alloc(Thread *thr) const {
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  // This is the only way we can control TLAB sizes without having safepoints.
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  // Implement exponential expansion within [MinTLABSize; _max_tlab_size], based
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  // on previously "used" TLAB size.
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  size_t size = MIN2(_max_tlab_size * HeapWordSize, MAX2(MinTLABSize, thr->tlab().used() * HeapWordSize * 2));
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  if (log_is_enabled(Trace, gc)) {
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    ResourceMark rm;
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    log_trace(gc)(
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            "Selecting TLAB size for \"%s\" (Desired: " SIZE_FORMAT "K, Used: " SIZE_FORMAT "K) -> " SIZE_FORMAT "K",
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            Thread::current()->name(),
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            thr->tlab().desired_size() * HeapWordSize / K,
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            thr->tlab().used() * HeapWordSize / K,
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            size / K);
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  }
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  return size;
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}
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EpsilonHeap* EpsilonHeap::heap() {
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  CollectedHeap* heap = Universe::heap();
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  assert(heap != NULL, "Uninitialized access to EpsilonHeap::heap()");
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  assert(heap->kind() == CollectedHeap::EpsilonHeap, "Not a EpsilonHeap");
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  return (EpsilonHeap*)heap;
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}
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HeapWord* EpsilonHeap::allocate_work(size_t size) {
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  HeapWord* res = _space->par_allocate(size);
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  while (res == NULL) {
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    // Allocation failed, attempt expansion, and retry:
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    MutexLockerEx ml(Heap_lock);
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    if (!_virtual_space.expand_by(MAX2(size, EpsilonMinHeapExpand))) {
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      return NULL;
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    }
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    _space->set_end((HeapWord *) _virtual_space.high());
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    res = _space->par_allocate(size);
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  }
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  size_t used = _space->used();
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  if (used - _last_counter_update >= 1024 * 1024) {
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    _last_counter_update = used;
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    _monitoring_support->update_counters();
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  }
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  return res;
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}
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HeapWord* EpsilonHeap::allocate_new_tlab(size_t size) {
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  return allocate_work(size);
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}
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HeapWord* EpsilonHeap::mem_allocate(size_t size, bool *gc_overhead_limit_was_exceeded) {
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  *gc_overhead_limit_was_exceeded = false;
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  return allocate_work(size);
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}
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void EpsilonHeap::collect(GCCause::Cause cause) {
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  log_info(gc)("GC was triggered with cause \"%s\". Ignoring.", GCCause::to_string(cause));
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  _monitoring_support->update_counters();
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}
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void EpsilonHeap::do_full_collection(bool clear_all_soft_refs) {
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  log_info(gc)("Full GC was triggered with cause \"%s\". Ignoring.", GCCause::to_string(gc_cause()));
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  _monitoring_support->update_counters();
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}
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void EpsilonHeap::safe_object_iterate(ObjectClosure *cl) {
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  _space->safe_object_iterate(cl);
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}
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void EpsilonHeap::print_on(outputStream *st) const {
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  st->print_cr("Epsilon Heap");
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  // Cast away constness:
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  ((VirtualSpace)_virtual_space).print_on(st);
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  st->print_cr("Allocation space:");
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  _space->print_on(st);
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}
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void EpsilonHeap::print_tracing_info() const {
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  Log(gc) log;
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  size_t allocated_kb = used() / K;
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  log.info("Total allocated: " SIZE_FORMAT " KB",
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           allocated_kb);
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  log.info("Average allocation rate: " SIZE_FORMAT " KB/sec",
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           allocated_kb * NANOSECS_PER_SEC / os::elapsed_counter());
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}