author | pliden |
Thu, 25 Apr 2019 08:55:49 +0200 | |
changeset 54616 | 3ab77d8dc60a |
parent 54331 | f0fec71d2fff |
child 54617 | 24f6b0e413a0 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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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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#include "precompiled.hpp" |
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#include "gc/shared/oopStorage.hpp" |
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#include "gc/z/zAddress.hpp" |
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#include "gc/z/zGlobals.hpp" |
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#include "gc/z/zHeap.inline.hpp" |
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#include "gc/z/zHeapIterator.hpp" |
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#include "gc/z/zList.inline.hpp" |
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#include "gc/z/zLock.inline.hpp" |
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#include "gc/z/zMark.inline.hpp" |
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#include "gc/z/zOopClosures.inline.hpp" |
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#include "gc/z/zPage.inline.hpp" |
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#include "gc/z/zPageTable.inline.hpp" |
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#include "gc/z/zRelocationSet.inline.hpp" |
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#include "gc/z/zResurrection.hpp" |
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#include "gc/z/zRootsIterator.hpp" |
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#include "gc/z/zStat.hpp" |
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#include "gc/z/zTask.hpp" |
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#include "gc/z/zThread.hpp" |
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#include "gc/z/zTracer.inline.hpp" |
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#include "gc/z/zVirtualMemory.inline.hpp" |
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#include "gc/z/zWorkers.inline.hpp" |
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#include "logging/log.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/safepoint.hpp" |
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#include "runtime/thread.hpp" |
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#include "utilities/align.hpp" |
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#include "utilities/debug.hpp" |
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static const ZStatSampler ZSamplerHeapUsedBeforeMark("Memory", "Heap Used Before Mark", ZStatUnitBytes); |
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static const ZStatSampler ZSamplerHeapUsedAfterMark("Memory", "Heap Used After Mark", ZStatUnitBytes); |
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static const ZStatSampler ZSamplerHeapUsedBeforeRelocation("Memory", "Heap Used Before Relocation", ZStatUnitBytes); |
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static const ZStatSampler ZSamplerHeapUsedAfterRelocation("Memory", "Heap Used After Relocation", ZStatUnitBytes); |
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static const ZStatCounter ZCounterUndoPageAllocation("Memory", "Undo Page Allocation", ZStatUnitOpsPerSecond); |
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static const ZStatCounter ZCounterOutOfMemory("Memory", "Out Of Memory", ZStatUnitOpsPerSecond); |
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ZHeap* ZHeap::_heap = NULL; |
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ZHeap::ZHeap() : |
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_workers(), |
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_object_allocator(_workers.nworkers()), |
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_page_allocator(heap_min_size(), heap_max_size(), heap_max_reserve_size()), |
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_page_table(), |
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_forwarding_table(), |
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_mark(&_workers, &_page_table), |
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_reference_processor(&_workers), |
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_weak_roots_processor(&_workers), |
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_relocate(&_workers), |
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_relocation_set(), |
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_unload(&_workers), |
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_serviceability(heap_min_size(), heap_max_size()) { |
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// Install global heap instance |
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assert(_heap == NULL, "Already initialized"); |
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_heap = this; |
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// Update statistics |
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ZStatHeap::set_at_initialize(heap_max_size(), heap_max_reserve_size()); |
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} |
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size_t ZHeap::heap_min_size() const { |
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const size_t aligned_min_size = align_up(InitialHeapSize, ZGranuleSize); |
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return MIN2(aligned_min_size, heap_max_size()); |
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} |
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size_t ZHeap::heap_max_size() const { |
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const size_t aligned_max_size = align_up(MaxHeapSize, ZGranuleSize); |
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return MIN2(aligned_max_size, ZAddressOffsetMax); |
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} |
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size_t ZHeap::heap_max_reserve_size() const { |
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// Reserve one small page per worker plus one shared medium page. This is still just |
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// an estimate and doesn't guarantee that we can't run out of memory during relocation. |
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const size_t max_reserve_size = (_workers.nworkers() * ZPageSizeSmall) + ZPageSizeMedium; |
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return MIN2(max_reserve_size, heap_max_size()); |
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} |
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bool ZHeap::is_initialized() const { |
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return _page_allocator.is_initialized() && _mark.is_initialized(); |
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} |
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size_t ZHeap::min_capacity() const { |
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return heap_min_size(); |
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} |
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size_t ZHeap::max_capacity() const { |
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return _page_allocator.max_capacity(); |
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} |
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size_t ZHeap::current_max_capacity() const { |
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return _page_allocator.current_max_capacity(); |
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} |
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size_t ZHeap::capacity() const { |
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return _page_allocator.capacity(); |
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} |
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|
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size_t ZHeap::max_reserve() const { |
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return _page_allocator.max_reserve(); |
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} |
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|
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size_t ZHeap::used_high() const { |
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return _page_allocator.used_high(); |
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} |
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|
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size_t ZHeap::used_low() const { |
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return _page_allocator.used_low(); |
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} |
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|
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size_t ZHeap::used() const { |
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return _page_allocator.used(); |
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} |
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size_t ZHeap::unused() const { |
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} |
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||
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size_t ZHeap::allocated() const { |
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return _page_allocator.allocated(); |
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} |
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|
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size_t ZHeap::reclaimed() const { |
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return _page_allocator.reclaimed(); |
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} |
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|
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size_t ZHeap::tlab_capacity() const { |
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return capacity(); |
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} |
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|
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size_t ZHeap::tlab_used() const { |
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return _object_allocator.used(); |
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} |
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|
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size_t ZHeap::max_tlab_size() const { |
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return ZObjectSizeLimitSmall; |
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} |
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|
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size_t ZHeap::unsafe_max_tlab_alloc() const { |
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size_t size = _object_allocator.remaining(); |
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|
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if (size < MinTLABSize) { |
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// The remaining space in the allocator is not enough to |
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// fit the smallest possible TLAB. This means that the next |
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// TLAB allocation will force the allocator to get a new |
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// backing page anyway, which in turn means that we can then |
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// fit the largest possible TLAB. |
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size = max_tlab_size(); |
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} |
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|
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return MIN2(size, max_tlab_size()); |
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} |
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bool ZHeap::is_in(uintptr_t addr) const { |
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if (addr < ZAddressReservedStart() || addr >= ZAddressReservedEnd()) { |
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return false; |
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} |
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const ZPage* const page = _page_table.get(addr); |
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if (page != NULL) { |
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return page->is_in(addr); |
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} |
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|
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return false; |
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} |
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|
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uintptr_t ZHeap::block_start(uintptr_t addr) const { |
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const ZPage* const page = _page_table.get(addr); |
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return page->block_start(addr); |
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} |
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|
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bool ZHeap::block_is_obj(uintptr_t addr) const { |
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const ZPage* const page = _page_table.get(addr); |
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return page->block_is_obj(addr); |
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} |
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|
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uint ZHeap::nconcurrent_worker_threads() const { |
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return _workers.nconcurrent(); |
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} |
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|
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uint ZHeap::nconcurrent_no_boost_worker_threads() const { |
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return _workers.nconcurrent_no_boost(); |
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} |
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|
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void ZHeap::set_boost_worker_threads(bool boost) { |
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_workers.set_boost(boost); |
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} |
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|
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void ZHeap::worker_threads_do(ThreadClosure* tc) const { |
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_workers.threads_do(tc); |
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} |
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|
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void ZHeap::print_worker_threads_on(outputStream* st) const { |
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_workers.print_threads_on(st); |
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} |
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|
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void ZHeap::out_of_memory() { |
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ResourceMark rm; |
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|
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ZStatInc(ZCounterOutOfMemory); |
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log_info(gc)("Out Of Memory (%s)", Thread::current()->name()); |
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} |
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|
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ZPage* ZHeap::alloc_page(uint8_t type, size_t size, ZAllocationFlags flags) { |
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ZPage* const page = _page_allocator.alloc_page(type, size, flags); |
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if (page != NULL) { |
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// Insert page table entry |
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_page_table.insert(page); |
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} |
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|
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return page; |
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} |
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|
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void ZHeap::undo_alloc_page(ZPage* page) { |
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assert(page->is_allocating(), "Invalid page state"); |
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|
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ZStatInc(ZCounterUndoPageAllocation); |
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log_trace(gc)("Undo page allocation, thread: " PTR_FORMAT " (%s), page: " PTR_FORMAT ", size: " SIZE_FORMAT, |
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ZThread::id(), ZThread::name(), p2i(page), page->size()); |
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free_page(page, false /* reclaimed */); |
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} |
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void ZHeap::free_page(ZPage* page, bool reclaimed) { |
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// Remove page table entry |
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_page_table.remove(page); |
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// Free page |
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_page_allocator.free_page(page, reclaimed); |
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} |
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void ZHeap::before_flip() { |
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if (ZVerifyViews) { |
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// Unmap all pages |
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_page_allocator.unmap_all_pages(); |
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} |
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} |
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|
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void ZHeap::after_flip() { |
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if (ZVerifyViews) { |
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// Map all pages |
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ZPageTableIterator iter(&_page_table); |
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for (ZPage* page; iter.next(&page);) { |
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_page_allocator.map_page(page); |
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} |
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} |
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} |
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|
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void ZHeap::flip_to_marked() { |
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before_flip(); |
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ZAddressMasks::flip_to_marked(); |
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after_flip(); |
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} |
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|
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void ZHeap::flip_to_remapped() { |
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before_flip(); |
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ZAddressMasks::flip_to_remapped(); |
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after_flip(); |
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} |
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|
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void ZHeap::mark_start() { |
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assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint"); |
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|
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// Update statistics |
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ZStatSample(ZSamplerHeapUsedBeforeMark, used()); |
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|
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// Flip address view |
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flip_to_marked(); |
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|
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// Retire allocating pages |
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_object_allocator.retire_pages(); |
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|
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// Reset allocated/reclaimed/used statistics |
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_page_allocator.reset_statistics(); |
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|
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// Reset encountered/dropped/enqueued statistics |
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_reference_processor.reset_statistics(); |
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|
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// Enter mark phase |
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ZGlobalPhase = ZPhaseMark; |
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|
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// Reset marking information and mark roots |
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_mark.start(); |
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|
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// Update statistics |
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ZStatHeap::set_at_mark_start(capacity(), used()); |
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} |
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|
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void ZHeap::mark(bool initial) { |
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_mark.mark(initial); |
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} |
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|
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void ZHeap::mark_flush_and_free(Thread* thread) { |
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_mark.flush_and_free(thread); |
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} |
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|
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class ZFixupPartialLoadsClosure : public ZRootsIteratorClosure { |
319 |
public: |
|
320 |
virtual void do_oop(oop* p) { |
|
321 |
ZBarrier::mark_barrier_on_root_oop_field(p); |
|
322 |
} |
|
323 |
||
324 |
virtual void do_oop(narrowOop* p) { |
|
325 |
ShouldNotReachHere(); |
|
326 |
} |
|
327 |
}; |
|
328 |
||
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class ZFixupPartialLoadsTask : public ZTask { |
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private: |
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ZThreadRootsIterator _thread_roots; |
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|
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public: |
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ZFixupPartialLoadsTask() : |
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ZTask("ZFixupPartialLoadsTask"), |
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_thread_roots() {} |
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|
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virtual void work() { |
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ZFixupPartialLoadsClosure cl; |
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_thread_roots.oops_do(&cl); |
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} |
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}; |
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|
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void ZHeap::fixup_partial_loads() { |
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ZFixupPartialLoadsTask task; |
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_workers.run_parallel(&task); |
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} |
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|
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bool ZHeap::mark_end() { |
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assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint"); |
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|
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// C2 can generate code where a safepoint poll is inserted |
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// between a load and the associated load barrier. To handle |
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// this case we need to rescan the thread stack here to make |
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// sure such oops are marked. |
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fixup_partial_loads(); |
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|
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// Try end marking |
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if (!_mark.end()) { |
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// Marking not completed, continue concurrent mark |
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return false; |
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} |
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|
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// Enter mark completed phase |
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ZGlobalPhase = ZPhaseMarkCompleted; |
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|
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// Update statistics |
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|
368 |
ZStatSample(ZSamplerHeapUsedAfterMark, used()); |
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|
369 |
ZStatHeap::set_at_mark_end(capacity(), allocated(), used()); |
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|
370 |
|
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|
371 |
// Block resurrection of weak/phantom references |
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|
372 |
ZResurrection::block(); |
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|
373 |
|
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|
374 |
// Process weak roots |
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|
375 |
_weak_roots_processor.process_weak_roots(); |
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|
376 |
|
52939 | 377 |
// Prepare to unload unused classes and code |
378 |
_unload.prepare(); |
|
379 |
||
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|
380 |
return true; |
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|
381 |
} |
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|
382 |
|
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|
383 |
void ZHeap::set_soft_reference_policy(bool clear) { |
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|
384 |
_reference_processor.set_soft_reference_policy(clear); |
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|
385 |
} |
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|
386 |
|
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|
387 |
void ZHeap::process_non_strong_references() { |
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|
388 |
// Process Soft/Weak/Final/PhantomReferences |
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|
389 |
_reference_processor.process_references(); |
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|
390 |
|
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|
391 |
// Process concurrent weak roots |
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|
392 |
_weak_roots_processor.process_concurrent_weak_roots(); |
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|
393 |
|
52939 | 394 |
// Unload unused classes and code |
395 |
_unload.unload(); |
|
396 |
||
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|
397 |
// Unblock resurrection of weak/phantom references |
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|
398 |
ZResurrection::unblock(); |
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|
399 |
|
767cdb97f103
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|
400 |
// Enqueue Soft/Weak/Final/PhantomReferences. Note that this |
767cdb97f103
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|
401 |
// must be done after unblocking resurrection. Otherwise the |
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|
402 |
// Finalizer thread could call Reference.get() on the Finalizers |
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|
403 |
// that were just enqueued, which would incorrectly return null |
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|
404 |
// during the resurrection block window, since such referents |
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|
405 |
// are only Finalizable marked. |
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|
406 |
_reference_processor.enqueue_references(); |
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|
407 |
} |
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|
408 |
|
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|
409 |
void ZHeap::select_relocation_set() { |
54174 | 410 |
// Do not allow pages to be deleted |
411 |
_page_allocator.enable_deferred_delete(); |
|
412 |
||
50525
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|
413 |
// Register relocatable pages with selector |
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|
414 |
ZRelocationSetSelector selector; |
54164 | 415 |
ZPageTableIterator pt_iter(&_page_table); |
54163
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|
416 |
for (ZPage* page; pt_iter.next(&page);) { |
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|
417 |
if (!page->is_relocatable()) { |
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|
418 |
// Not relocatable, don't register |
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|
419 |
continue; |
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|
420 |
} |
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|
421 |
|
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|
422 |
if (page->is_marked()) { |
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|
423 |
// Register live page |
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|
424 |
selector.register_live_page(page); |
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|
425 |
} else { |
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|
426 |
// Register garbage page |
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|
427 |
selector.register_garbage_page(page); |
767cdb97f103
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|
428 |
|
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|
429 |
// Reclaim page immediately |
54162
f344a0c6e19e
8220587: ZGC: Break out forwarding information from ZPage
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54161
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|
430 |
free_page(page, true /* reclaimed */); |
50525
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|
431 |
} |
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|
432 |
} |
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changeset
|
433 |
|
54174 | 434 |
// Allow pages to be deleted |
435 |
_page_allocator.disable_deferred_delete(); |
|
436 |
||
50525
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|
437 |
// Select pages to relocate |
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|
438 |
selector.select(&_relocation_set); |
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|
439 |
|
54163
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8220588: ZGC: Convert ZRelocationSet to hold ZForwardings instead of ZPages
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|
440 |
// Setup forwarding table |
790679f86a51
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|
441 |
ZRelocationSetIterator rs_iter(&_relocation_set); |
790679f86a51
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|
442 |
for (ZForwarding* forwarding; rs_iter.next(&forwarding);) { |
790679f86a51
8220588: ZGC: Convert ZRelocationSet to hold ZForwardings instead of ZPages
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|
443 |
_forwarding_table.insert(forwarding); |
790679f86a51
8220588: ZGC: Convert ZRelocationSet to hold ZForwardings instead of ZPages
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54162
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|
444 |
} |
790679f86a51
8220588: ZGC: Convert ZRelocationSet to hold ZForwardings instead of ZPages
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parents:
54162
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changeset
|
445 |
|
50525
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|
446 |
// Update statistics |
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|
447 |
ZStatRelocation::set_at_select_relocation_set(selector.relocating()); |
767cdb97f103
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|
448 |
ZStatHeap::set_at_select_relocation_set(selector.live(), |
767cdb97f103
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|
449 |
selector.garbage(), |
767cdb97f103
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|
450 |
reclaimed()); |
767cdb97f103
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|
451 |
} |
767cdb97f103
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parents:
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changeset
|
452 |
|
54163
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8220588: ZGC: Convert ZRelocationSet to hold ZForwardings instead of ZPages
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parents:
54162
diff
changeset
|
453 |
void ZHeap::reset_relocation_set() { |
790679f86a51
8220588: ZGC: Convert ZRelocationSet to hold ZForwardings instead of ZPages
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parents:
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changeset
|
454 |
// Reset forwarding table |
50525
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changeset
|
455 |
ZRelocationSetIterator iter(&_relocation_set); |
54163
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parents:
54162
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changeset
|
456 |
for (ZForwarding* forwarding; iter.next(&forwarding);) { |
790679f86a51
8220588: ZGC: Convert ZRelocationSet to hold ZForwardings instead of ZPages
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|
457 |
_forwarding_table.remove(forwarding); |
50525
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changeset
|
458 |
} |
767cdb97f103
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parents:
diff
changeset
|
459 |
|
54163
790679f86a51
8220588: ZGC: Convert ZRelocationSet to hold ZForwardings instead of ZPages
pliden
parents:
54162
diff
changeset
|
460 |
// Reset relocation set |
790679f86a51
8220588: ZGC: Convert ZRelocationSet to hold ZForwardings instead of ZPages
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parents:
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changeset
|
461 |
_relocation_set.reset(); |
50525
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changeset
|
462 |
} |
767cdb97f103
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changeset
|
463 |
|
767cdb97f103
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parents:
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|
464 |
void ZHeap::relocate_start() { |
767cdb97f103
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changeset
|
465 |
assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint"); |
767cdb97f103
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changeset
|
466 |
|
52939 | 467 |
// Finish unloading of classes and code |
468 |
_unload.finish(); |
|
50525
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parents:
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changeset
|
469 |
|
767cdb97f103
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parents:
diff
changeset
|
470 |
// Flip address view |
54159
7c23a4432610
8220569: ZGC: Rename and rework ZUnmapBadViews to ZVerifyViews
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parents:
54094
diff
changeset
|
471 |
flip_to_remapped(); |
50525
767cdb97f103
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parents:
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changeset
|
472 |
|
767cdb97f103
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parents:
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changeset
|
473 |
// Enter relocate phase |
767cdb97f103
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changeset
|
474 |
ZGlobalPhase = ZPhaseRelocate; |
767cdb97f103
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changeset
|
475 |
|
767cdb97f103
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parents:
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changeset
|
476 |
// Update statistics |
52939 | 477 |
ZStatSample(ZSamplerHeapUsedBeforeRelocation, used()); |
50525
767cdb97f103
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parents:
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changeset
|
478 |
ZStatHeap::set_at_relocate_start(capacity(), allocated(), used()); |
767cdb97f103
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parents:
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changeset
|
479 |
|
767cdb97f103
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parents:
diff
changeset
|
480 |
// Remap/Relocate roots |
767cdb97f103
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parents:
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changeset
|
481 |
_relocate.start(); |
767cdb97f103
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parents:
diff
changeset
|
482 |
} |
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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parents:
diff
changeset
|
483 |
|
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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parents:
diff
changeset
|
484 |
void ZHeap::relocate() { |
767cdb97f103
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parents:
diff
changeset
|
485 |
// Relocate relocation set |
767cdb97f103
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parents:
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changeset
|
486 |
const bool success = _relocate.relocate(&_relocation_set); |
767cdb97f103
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parents:
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changeset
|
487 |
|
767cdb97f103
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parents:
diff
changeset
|
488 |
// Update statistics |
767cdb97f103
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parents:
diff
changeset
|
489 |
ZStatSample(ZSamplerHeapUsedAfterRelocation, used()); |
767cdb97f103
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parents:
diff
changeset
|
490 |
ZStatRelocation::set_at_relocate_end(success); |
767cdb97f103
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parents:
diff
changeset
|
491 |
ZStatHeap::set_at_relocate_end(capacity(), allocated(), reclaimed(), |
767cdb97f103
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parents:
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|
492 |
used(), used_high(), used_low()); |
767cdb97f103
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parents:
diff
changeset
|
493 |
} |
767cdb97f103
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parents:
diff
changeset
|
494 |
|
50871
d283a214f42b
8205923: ZGC: Verification applies load barriers before verification
stefank
parents:
50584
diff
changeset
|
495 |
void ZHeap::object_iterate(ObjectClosure* cl, bool visit_referents) { |
50525
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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parents:
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changeset
|
496 |
assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint"); |
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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parents:
diff
changeset
|
497 |
|
50871
d283a214f42b
8205923: ZGC: Verification applies load barriers before verification
stefank
parents:
50584
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|
498 |
ZHeapIterator iter(visit_referents); |
50525
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|
499 |
iter.objects_do(cl); |
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|
500 |
} |
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|
501 |
|
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|
502 |
void ZHeap::serviceability_initialize() { |
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|
503 |
_serviceability.initialize(); |
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|
504 |
} |
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|
505 |
|
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|
506 |
GCMemoryManager* ZHeap::serviceability_memory_manager() { |
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|
507 |
return _serviceability.memory_manager(); |
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|
508 |
} |
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|
509 |
|
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|
510 |
MemoryPool* ZHeap::serviceability_memory_pool() { |
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|
511 |
return _serviceability.memory_pool(); |
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|
512 |
} |
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|
513 |
|
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|
514 |
ZServiceabilityCounters* ZHeap::serviceability_counters() { |
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|
515 |
return _serviceability.counters(); |
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|
516 |
} |
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|
517 |
|
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|
518 |
void ZHeap::print_on(outputStream* st) const { |
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|
519 |
st->print_cr(" ZHeap used " SIZE_FORMAT "M, capacity " SIZE_FORMAT "M, max capacity " SIZE_FORMAT "M", |
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|
520 |
used() / M, |
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|
521 |
capacity() / M, |
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|
522 |
max_capacity() / M); |
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|
523 |
MetaspaceUtils::print_on(st); |
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|
524 |
} |
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|
525 |
|
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|
526 |
void ZHeap::print_extended_on(outputStream* st) const { |
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|
527 |
print_on(st); |
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|
528 |
st->cr(); |
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|
529 |
|
54174 | 530 |
// Do not allow pages to be deleted |
531 |
_page_allocator.enable_deferred_delete(); |
|
532 |
||
533 |
// Print all pages |
|
54164 | 534 |
ZPageTableIterator iter(&_page_table); |
50525
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|
535 |
for (ZPage* page; iter.next(&page);) { |
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|
536 |
page->print_on(st); |
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|
537 |
} |
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changeset
|
538 |
|
54174 | 539 |
// Allow pages to be deleted |
540 |
_page_allocator.enable_deferred_delete(); |
|
541 |
||
50525
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|
542 |
st->cr(); |
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|
543 |
} |
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|
544 |
|
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|
545 |
class ZVerifyRootsTask : public ZTask { |
767cdb97f103
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|
546 |
private: |
54331
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8221153: ZGC: Heap iteration and verification pollutes GC statistics
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54174
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|
547 |
ZStatTimerDisable _disable; |
50525
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|
548 |
ZRootsIterator _strong_roots; |
767cdb97f103
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|
549 |
ZWeakRootsIterator _weak_roots; |
767cdb97f103
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|
550 |
|
767cdb97f103
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|
551 |
public: |
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|
552 |
ZVerifyRootsTask() : |
767cdb97f103
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|
553 |
ZTask("ZVerifyRootsTask"), |
54331
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8221153: ZGC: Heap iteration and verification pollutes GC statistics
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54174
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|
554 |
_disable(), |
50525
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|
555 |
_strong_roots(), |
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|
556 |
_weak_roots() {} |
767cdb97f103
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|
557 |
|
767cdb97f103
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|
558 |
virtual void work() { |
54331
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8221153: ZGC: Heap iteration and verification pollutes GC statistics
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parents:
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|
559 |
ZStatTimerDisable disable; |
52382
2e280ecec246
8212921: ZGC: Move verification to after resurrection unblocked
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parents:
52140
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changeset
|
560 |
ZVerifyOopClosure cl; |
50525
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|
561 |
_strong_roots.oops_do(&cl); |
767cdb97f103
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|
562 |
_weak_roots.oops_do(&cl); |
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|
563 |
} |
767cdb97f103
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parents:
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|
564 |
}; |
767cdb97f103
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parents:
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changeset
|
565 |
|
767cdb97f103
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|
566 |
void ZHeap::verify() { |
767cdb97f103
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parents:
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|
567 |
// Heap verification can only be done between mark end and |
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|
568 |
// relocate start. This is the only window where all oop are |
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|
569 |
// good and the whole heap is in a consistent state. |
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|
570 |
guarantee(ZGlobalPhase == ZPhaseMarkCompleted, "Invalid phase"); |
767cdb97f103
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changeset
|
571 |
|
767cdb97f103
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parents:
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changeset
|
572 |
{ |
767cdb97f103
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parents:
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changeset
|
573 |
ZVerifyRootsTask task; |
767cdb97f103
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parents:
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changeset
|
574 |
_workers.run_parallel(&task); |
767cdb97f103
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parents:
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changeset
|
575 |
} |
767cdb97f103
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parents:
diff
changeset
|
576 |
|
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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parents:
diff
changeset
|
577 |
{ |
767cdb97f103
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parents:
diff
changeset
|
578 |
ZVerifyObjectClosure cl; |
50871
d283a214f42b
8205923: ZGC: Verification applies load barriers before verification
stefank
parents:
50584
diff
changeset
|
579 |
object_iterate(&cl, false /* visit_referents */); |
50525
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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|
580 |
} |
767cdb97f103
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parents:
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changeset
|
581 |
} |