author | jwilhelm |
Thu, 03 Oct 2013 21:36:29 +0200 | |
changeset 20398 | b206c580c45f |
parent 20309 | 7445302daff6 |
child 20318 | a02849111b27 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2013, 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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*/ |
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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
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#include "gc_implementation/g1/concurrentMark.hpp" |
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#include "gc_implementation/g1/evacuationInfo.hpp" |
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#include "gc_implementation/g1/g1AllocRegion.hpp" |
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#include "gc_implementation/g1/g1HRPrinter.hpp" |
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#include "gc_implementation/g1/g1MonitoringSupport.hpp" |
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#include "gc_implementation/g1/g1RemSet.hpp" |
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#include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" |
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#include "gc_implementation/g1/g1YCTypes.hpp" |
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#include "gc_implementation/g1/heapRegionSeq.hpp" |
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#include "gc_implementation/g1/heapRegionSets.hpp" |
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#include "gc_implementation/shared/hSpaceCounters.hpp" |
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#include "gc_implementation/shared/parGCAllocBuffer.hpp" |
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#include "memory/barrierSet.hpp" |
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#include "memory/memRegion.hpp" |
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#include "memory/sharedHeap.hpp" |
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#include "utilities/stack.hpp" |
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// A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
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// It uses the "Garbage First" heap organization and algorithm, which |
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// may combine concurrent marking with parallel, incremental compaction of |
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// heap subsets that will yield large amounts of garbage. |
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// Forward declarations |
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class HeapRegion; |
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class HRRSCleanupTask; |
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class GenerationSpec; |
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class OopsInHeapRegionClosure; |
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class G1KlassScanClosure; |
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class G1ScanHeapEvacClosure; |
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class ObjectClosure; |
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class SpaceClosure; |
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class CompactibleSpaceClosure; |
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class Space; |
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class G1CollectorPolicy; |
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class GenRemSet; |
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class G1RemSet; |
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class HeapRegionRemSetIterator; |
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class ConcurrentMark; |
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class ConcurrentMarkThread; |
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class ConcurrentG1Refine; |
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class ConcurrentGCTimer; |
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class GenerationCounters; |
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class STWGCTimer; |
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class G1NewTracer; |
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class G1OldTracer; |
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class EvacuationFailedInfo; |
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class nmethod; |
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typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
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typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; |
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typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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enum GCAllocPurpose { |
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GCAllocForTenured, |
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GCAllocForSurvived, |
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GCAllocPurposeCount |
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}; |
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class YoungList : public CHeapObj<mtGC> { |
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private: |
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G1CollectedHeap* _g1h; |
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HeapRegion* _head; |
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HeapRegion* _survivor_head; |
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HeapRegion* _survivor_tail; |
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HeapRegion* _curr; |
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uint _length; |
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uint _survivor_length; |
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size_t _last_sampled_rs_lengths; |
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size_t _sampled_rs_lengths; |
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void empty_list(HeapRegion* list); |
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public: |
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YoungList(G1CollectedHeap* g1h); |
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void push_region(HeapRegion* hr); |
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void add_survivor_region(HeapRegion* hr); |
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void empty_list(); |
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bool is_empty() { return _length == 0; } |
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uint length() { return _length; } |
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uint survivor_length() { return _survivor_length; } |
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// Currently we do not keep track of the used byte sum for the |
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// young list and the survivors and it'd be quite a lot of work to |
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// do so. When we'll eventually replace the young list with |
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// instances of HeapRegionLinkedList we'll get that for free. So, |
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// we'll report the more accurate information then. |
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size_t eden_used_bytes() { |
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assert(length() >= survivor_length(), "invariant"); |
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return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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} |
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size_t survivor_used_bytes() { |
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return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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} |
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void rs_length_sampling_init(); |
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bool rs_length_sampling_more(); |
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void rs_length_sampling_next(); |
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void reset_sampled_info() { |
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_last_sampled_rs_lengths = 0; |
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} |
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size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } |
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// for development purposes |
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void reset_auxilary_lists(); |
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void clear() { _head = NULL; _length = 0; } |
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void clear_survivors() { |
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_survivor_head = NULL; |
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_survivor_tail = NULL; |
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_survivor_length = 0; |
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} |
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HeapRegion* first_region() { return _head; } |
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HeapRegion* first_survivor_region() { return _survivor_head; } |
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HeapRegion* last_survivor_region() { return _survivor_tail; } |
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// debugging |
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bool check_list_well_formed(); |
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bool check_list_empty(bool check_sample = true); |
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void print(); |
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}; |
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class MutatorAllocRegion : public G1AllocRegion { |
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protected: |
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virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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public: |
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MutatorAllocRegion() |
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: G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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}; |
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class SurvivorGCAllocRegion : public G1AllocRegion { |
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protected: |
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virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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public: |
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SurvivorGCAllocRegion() |
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: G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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}; |
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class OldGCAllocRegion : public G1AllocRegion { |
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protected: |
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virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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public: |
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OldGCAllocRegion() |
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: G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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}; |
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// The G1 STW is alive closure. |
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// An instance is embedded into the G1CH and used as the |
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// (optional) _is_alive_non_header closure in the STW |
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// reference processor. It is also extensively used during |
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// reference processing during STW evacuation pauses. |
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class G1STWIsAliveClosure: public BoolObjectClosure { |
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G1CollectedHeap* _g1; |
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public: |
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G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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bool do_object_b(oop p); |
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}; |
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class RefineCardTableEntryClosure; |
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class G1CollectedHeap : public SharedHeap { |
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friend class VM_G1CollectForAllocation; |
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friend class VM_G1CollectFull; |
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friend class VM_G1IncCollectionPause; |
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friend class VMStructs; |
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friend class MutatorAllocRegion; |
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friend class SurvivorGCAllocRegion; |
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friend class OldGCAllocRegion; |
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// Closures used in implementation. |
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template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
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friend class G1ParCopyClosure; |
|
1374 | 213 |
friend class G1IsAliveClosure; |
214 |
friend class G1EvacuateFollowersClosure; |
|
215 |
friend class G1ParScanThreadState; |
|
216 |
friend class G1ParScanClosureSuper; |
|
217 |
friend class G1ParEvacuateFollowersClosure; |
|
218 |
friend class G1ParTask; |
|
219 |
friend class G1FreeGarbageRegionClosure; |
|
220 |
friend class RefineCardTableEntryClosure; |
|
221 |
friend class G1PrepareCompactClosure; |
|
222 |
friend class RegionSorter; |
|
7923 | 223 |
friend class RegionResetter; |
1374 | 224 |
friend class CountRCClosure; |
225 |
friend class EvacPopObjClosure; |
|
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friend class G1ParCleanupCTTask; |
1374 | 227 |
|
228 |
// Other related classes. |
|
229 |
friend class G1MarkSweep; |
|
230 |
||
231 |
private: |
|
232 |
// The one and only G1CollectedHeap, so static functions can find it. |
|
233 |
static G1CollectedHeap* _g1h; |
|
234 |
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235 |
static size_t _humongous_object_threshold_in_words; |
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|
236 |
|
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|
237 |
// Storage for the G1 heap. |
1374 | 238 |
VirtualSpace _g1_storage; |
239 |
MemRegion _g1_reserved; |
|
240 |
||
241 |
// The part of _g1_storage that is currently committed. |
|
242 |
MemRegion _g1_committed; |
|
243 |
||
7923 | 244 |
// The master free list. It will satisfy all new region allocations. |
245 |
MasterFreeRegionList _free_list; |
|
246 |
||
247 |
// The secondary free list which contains regions that have been |
|
248 |
// freed up during the cleanup process. This will be appended to the |
|
249 |
// master free list when appropriate. |
|
250 |
SecondaryFreeRegionList _secondary_free_list; |
|
251 |
||
10996 | 252 |
// It keeps track of the old regions. |
253 |
MasterOldRegionSet _old_set; |
|
254 |
||
7923 | 255 |
// It keeps track of the humongous regions. |
256 |
MasterHumongousRegionSet _humongous_set; |
|
1374 | 257 |
|
258 |
// The number of regions we could create by expansion. |
|
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259 |
uint _expansion_regions; |
1374 | 260 |
|
261 |
// The block offset table for the G1 heap. |
|
262 |
G1BlockOffsetSharedArray* _bot_shared; |
|
263 |
||
10996 | 264 |
// Tears down the region sets / lists so that they are empty and the |
265 |
// regions on the heap do not belong to a region set / list. The |
|
266 |
// only exception is the humongous set which we leave unaltered. If |
|
267 |
// free_list_only is true, it will only tear down the master free |
|
268 |
// list. It is called before a Full GC (free_list_only == false) or |
|
269 |
// before heap shrinking (free_list_only == true). |
|
270 |
void tear_down_region_sets(bool free_list_only); |
|
271 |
||
272 |
// Rebuilds the region sets / lists so that they are repopulated to |
|
273 |
// reflect the contents of the heap. The only exception is the |
|
274 |
// humongous set which was not torn down in the first place. If |
|
275 |
// free_list_only is true, it will only rebuild the master free |
|
276 |
// list. It is called after a Full GC (free_list_only == false) or |
|
277 |
// after heap shrinking (free_list_only == true). |
|
278 |
void rebuild_region_sets(bool free_list_only); |
|
1374 | 279 |
|
280 |
// The sequence of all heap regions in the heap. |
|
9989 | 281 |
HeapRegionSeq _hrs; |
1374 | 282 |
|
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283 |
// Alloc region used to satisfy mutator allocation requests. |
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|
284 |
MutatorAllocRegion _mutator_alloc_region; |
1374 | 285 |
|
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|
286 |
// Alloc region used to satisfy allocation requests by the GC for |
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|
287 |
// survivor objects. |
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|
288 |
SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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|
289 |
|
13466 | 290 |
// PLAB sizing policy for survivors. |
291 |
PLABStats _survivor_plab_stats; |
|
292 |
||
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|
293 |
// Alloc region used to satisfy allocation requests by the GC for |
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|
294 |
// old objects. |
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|
295 |
OldGCAllocRegion _old_gc_alloc_region; |
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|
296 |
|
13466 | 297 |
// PLAB sizing policy for tenured objects. |
298 |
PLABStats _old_plab_stats; |
|
299 |
||
300 |
PLABStats* stats_for_purpose(GCAllocPurpose purpose) { |
|
301 |
PLABStats* stats = NULL; |
|
302 |
||
303 |
switch (purpose) { |
|
304 |
case GCAllocForSurvived: |
|
305 |
stats = &_survivor_plab_stats; |
|
306 |
break; |
|
307 |
case GCAllocForTenured: |
|
308 |
stats = &_old_plab_stats; |
|
309 |
break; |
|
310 |
default: |
|
311 |
assert(false, "unrecognized GCAllocPurpose"); |
|
312 |
} |
|
313 |
||
314 |
return stats; |
|
315 |
} |
|
316 |
||
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|
317 |
// The last old region we allocated to during the last GC. |
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|
318 |
// Typically, it is not full so we should re-use it during the next GC. |
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|
319 |
HeapRegion* _retained_old_gc_alloc_region; |
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|
320 |
|
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|
321 |
// It specifies whether we should attempt to expand the heap after a |
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|
322 |
// region allocation failure. If heap expansion fails we set this to |
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|
323 |
// false so that we don't re-attempt the heap expansion (it's likely |
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|
324 |
// that subsequent expansion attempts will also fail if one fails). |
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|
325 |
// Currently, it is only consulted during GC and it's reset at the |
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|
326 |
// start of each GC. |
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|
327 |
bool _expand_heap_after_alloc_failure; |
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|
328 |
|
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|
329 |
// It resets the mutator alloc region before new allocations can take place. |
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|
330 |
void init_mutator_alloc_region(); |
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|
331 |
|
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|
332 |
// It releases the mutator alloc region. |
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|
333 |
void release_mutator_alloc_region(); |
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|
334 |
|
10243
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|
335 |
// It initializes the GC alloc regions at the start of a GC. |
18025 | 336 |
void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
1374 | 337 |
|
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|
338 |
// It releases the GC alloc regions at the end of a GC. |
18025 | 339 |
void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
1374 | 340 |
|
10243
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|
341 |
// It does any cleanup that needs to be done on the GC alloc regions |
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|
342 |
// before a Full GC. |
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|
343 |
void abandon_gc_alloc_regions(); |
1374 | 344 |
|
9338
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|
345 |
// Helper for monitoring and management support. |
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|
346 |
G1MonitoringSupport* _g1mm; |
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|
347 |
|
5347
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|
348 |
// Determines PLAB size for a particular allocation purpose. |
13466 | 349 |
size_t desired_plab_sz(GCAllocPurpose purpose); |
5347
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|
350 |
|
1374 | 351 |
// Outside of GC pauses, the number of bytes used in all regions other |
352 |
// than the current allocation region. |
|
353 |
size_t _summary_bytes_used; |
|
354 |
||
1902 | 355 |
// This is used for a quick test on whether a reference points into |
356 |
// the collection set or not. Basically, we have an array, with one |
|
357 |
// byte per region, and that byte denotes whether the corresponding |
|
358 |
// region is in the collection set or not. The entry corresponding |
|
359 |
// the bottom of the heap, i.e., region 0, is pointed to by |
|
360 |
// _in_cset_fast_test_base. The _in_cset_fast_test field has been |
|
361 |
// biased so that it actually points to address 0 of the address |
|
362 |
// space, to make the test as fast as possible (we can simply shift |
|
363 |
// the address to address into it, instead of having to subtract the |
|
364 |
// bottom of the heap from the address before shifting it; basically |
|
365 |
// it works in the same way the card table works). |
|
366 |
bool* _in_cset_fast_test; |
|
367 |
||
368 |
// The allocated array used for the fast test on whether a reference |
|
369 |
// points into the collection set or not. This field is also used to |
|
370 |
// free the array. |
|
371 |
bool* _in_cset_fast_test_base; |
|
372 |
||
373 |
// The length of the _in_cset_fast_test_base array. |
|
12381
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|
374 |
uint _in_cset_fast_test_length; |
1902 | 375 |
|
1385
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6723570: G1: assertion failure: p == current_top or oop(p)->is_oop(),"p is not a block start" (revisited!)
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diff
changeset
|
376 |
volatile unsigned _gc_time_stamp; |
1374 | 377 |
|
378 |
size_t* _surviving_young_words; |
|
379 |
||
10001
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7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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diff
changeset
|
380 |
G1HRPrinter _hr_printer; |
8aa7f885326e
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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diff
changeset
|
381 |
|
1374 | 382 |
void setup_surviving_young_words(); |
383 |
void update_surviving_young_words(size_t* surv_young_words); |
|
384 |
void cleanup_surviving_young_words(); |
|
385 |
||
6058
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|
386 |
// It decides whether an explicit GC should start a concurrent cycle |
9c9aec6ab47d
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|
387 |
// instead of doing a STW GC. Currently, a concurrent cycle is |
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6944166: G1: explicit GCs are not always handled correctly
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diff
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|
388 |
// explicitly started if: |
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|
389 |
// (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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diff
changeset
|
390 |
// (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
11576
e0bef5ca4602
6976060: G1: humongous object allocations should initiate marking cycles when necessary
brutisso
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diff
changeset
|
391 |
// (c) cause == _g1_humongous_allocation |
6058
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6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
392 |
bool should_do_concurrent_full_gc(GCCause::Cause cause); |
9c9aec6ab47d
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
393 |
|
12934
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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diff
changeset
|
394 |
// Keeps track of how many "old marking cycles" (i.e., Full GCs or |
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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diff
changeset
|
395 |
// concurrent cycles) we have started. |
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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diff
changeset
|
396 |
volatile unsigned int _old_marking_cycles_started; |
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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diff
changeset
|
397 |
|
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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diff
changeset
|
398 |
// Keeps track of how many "old marking cycles" (i.e., Full GCs or |
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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diff
changeset
|
399 |
// concurrent cycles) we have completed. |
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7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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changeset
|
400 |
volatile unsigned int _old_marking_cycles_completed; |
6058
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changeset
|
401 |
|
18025 | 402 |
bool _concurrent_cycle_started; |
403 |
||
9334
640f1a6f0b85
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diff
changeset
|
404 |
// This is a non-product method that is helpful for testing. It is |
640f1a6f0b85
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diff
changeset
|
405 |
// called at the end of a GC and artificially expands the heap by |
640f1a6f0b85
7011855: G1: non-product flag to artificially grow the heap
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diff
changeset
|
406 |
// allocating a number of dead regions. This way we can induce very |
640f1a6f0b85
7011855: G1: non-product flag to artificially grow the heap
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diff
changeset
|
407 |
// frequent marking cycles and stress the cleanup / concurrent |
640f1a6f0b85
7011855: G1: non-product flag to artificially grow the heap
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diff
changeset
|
408 |
// cleanup code more (as all the regions that will be allocated by |
640f1a6f0b85
7011855: G1: non-product flag to artificially grow the heap
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diff
changeset
|
409 |
// this method will be found dead by the marking cycle). |
640f1a6f0b85
7011855: G1: non-product flag to artificially grow the heap
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diff
changeset
|
410 |
void allocate_dummy_regions() PRODUCT_RETURN; |
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7011855: G1: non-product flag to artificially grow the heap
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diff
changeset
|
411 |
|
13336
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
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diff
changeset
|
412 |
// Clear RSets after a compaction. It also resets the GC time stamps. |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
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diff
changeset
|
413 |
void clear_rsets_post_compaction(); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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changeset
|
414 |
|
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
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diff
changeset
|
415 |
// If the HR printer is active, dump the state of the regions in the |
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7114678: G1: various small fixes, code cleanup, and refactoring
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diff
changeset
|
416 |
// heap after a compaction. |
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changeset
|
417 |
void print_hrs_post_compaction(); |
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diff
changeset
|
418 |
|
13516
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7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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diff
changeset
|
419 |
double verify(bool guard, const char* msg); |
f7adc27fb367
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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diff
changeset
|
420 |
void verify_before_gc(); |
f7adc27fb367
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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diff
changeset
|
421 |
void verify_after_gc(); |
f7adc27fb367
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
13482
diff
changeset
|
422 |
|
13754
81163e1274d7
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
13728
diff
changeset
|
423 |
void log_gc_header(); |
81163e1274d7
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
13728
diff
changeset
|
424 |
void log_gc_footer(double pause_time_sec); |
81163e1274d7
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
13728
diff
changeset
|
425 |
|
7398 | 426 |
// These are macros so that, if the assert fires, we get the correct |
427 |
// line number, file, etc. |
|
428 |
||
8680 | 429 |
#define heap_locking_asserts_err_msg(_extra_message_) \ |
7923 | 430 |
err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
8680 | 431 |
(_extra_message_), \ |
7923 | 432 |
BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
433 |
BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ |
|
434 |
BOOL_TO_STR(Thread::current()->is_VM_thread())) |
|
7398 | 435 |
|
436 |
#define assert_heap_locked() \ |
|
437 |
do { \ |
|
438 |
assert(Heap_lock->owned_by_self(), \ |
|
439 |
heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ |
|
440 |
} while (0) |
|
441 |
||
8680 | 442 |
#define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
7398 | 443 |
do { \ |
444 |
assert(Heap_lock->owned_by_self() || \ |
|
7923 | 445 |
(SafepointSynchronize::is_at_safepoint() && \ |
8680 | 446 |
((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
7398 | 447 |
heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
448 |
"should be at a safepoint")); \ |
|
449 |
} while (0) |
|
450 |
||
451 |
#define assert_heap_locked_and_not_at_safepoint() \ |
|
452 |
do { \ |
|
453 |
assert(Heap_lock->owned_by_self() && \ |
|
454 |
!SafepointSynchronize::is_at_safepoint(), \ |
|
455 |
heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ |
|
456 |
"should not be at a safepoint")); \ |
|
457 |
} while (0) |
|
458 |
||
459 |
#define assert_heap_not_locked() \ |
|
460 |
do { \ |
|
461 |
assert(!Heap_lock->owned_by_self(), \ |
|
462 |
heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ |
|
463 |
} while (0) |
|
464 |
||
465 |
#define assert_heap_not_locked_and_not_at_safepoint() \ |
|
466 |
do { \ |
|
467 |
assert(!Heap_lock->owned_by_self() && \ |
|
468 |
!SafepointSynchronize::is_at_safepoint(), \ |
|
469 |
heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ |
|
470 |
"should not be at a safepoint")); \ |
|
471 |
} while (0) |
|
472 |
||
8680 | 473 |
#define assert_at_safepoint(_should_be_vm_thread_) \ |
7398 | 474 |
do { \ |
7923 | 475 |
assert(SafepointSynchronize::is_at_safepoint() && \ |
8680 | 476 |
((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
7398 | 477 |
heap_locking_asserts_err_msg("should be at a safepoint")); \ |
478 |
} while (0) |
|
479 |
||
480 |
#define assert_not_at_safepoint() \ |
|
481 |
do { \ |
|
482 |
assert(!SafepointSynchronize::is_at_safepoint(), \ |
|
483 |
heap_locking_asserts_err_msg("should not be at a safepoint")); \ |
|
484 |
} while (0) |
|
485 |
||
1374 | 486 |
protected: |
487 |
||
10236
c4256e927bed
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
10001
diff
changeset
|
488 |
// The young region list. |
1374 | 489 |
YoungList* _young_list; |
490 |
||
491 |
// The current policy object for the collector. |
|
492 |
G1CollectorPolicy* _g1_policy; |
|
493 |
||
7923 | 494 |
// This is the second level of trying to allocate a new region. If |
8928
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
495 |
// new_region() didn't find a region on the free_list, this call will |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
496 |
// check whether there's anything available on the |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
497 |
// secondary_free_list and/or wait for more regions to appear on |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
498 |
// that list, if _free_regions_coming is set. |
8680 | 499 |
HeapRegion* new_region_try_secondary_free_list(); |
1374 | 500 |
|
8680 | 501 |
// Try to allocate a single non-humongous HeapRegion sufficient for |
502 |
// an allocation of the given word_size. If do_expand is true, |
|
503 |
// attempt to expand the heap if necessary to satisfy the allocation |
|
504 |
// request. |
|
8928
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
505 |
HeapRegion* new_region(size_t word_size, bool do_expand); |
1374 | 506 |
|
8680 | 507 |
// Attempt to satisfy a humongous allocation request of the given |
508 |
// size by finding a contiguous set of free regions of num_regions |
|
509 |
// length and remove them from the master free list. Return the |
|
9989 | 510 |
// index of the first region or G1_NULL_HRS_INDEX if the search |
511 |
// was unsuccessful. |
|
12381
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
512 |
uint humongous_obj_allocate_find_first(uint num_regions, |
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
513 |
size_t word_size); |
1374 | 514 |
|
8680 | 515 |
// Initialize a contiguous set of free regions of length num_regions |
516 |
// and starting at index first so that they appear as a single |
|
517 |
// humongous region. |
|
12381
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
518 |
HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
519 |
uint num_regions, |
8680 | 520 |
size_t word_size); |
521 |
||
522 |
// Attempt to allocate a humongous object of the given size. Return |
|
523 |
// NULL if unsuccessful. |
|
7923 | 524 |
HeapWord* humongous_obj_allocate(size_t word_size); |
7398 | 525 |
|
526 |
// The following two methods, allocate_new_tlab() and |
|
527 |
// mem_allocate(), are the two main entry points from the runtime |
|
528 |
// into the G1's allocation routines. They have the following |
|
529 |
// assumptions: |
|
530 |
// |
|
531 |
// * They should both be called outside safepoints. |
|
532 |
// |
|
533 |
// * They should both be called without holding the Heap_lock. |
|
534 |
// |
|
535 |
// * All allocation requests for new TLABs should go to |
|
536 |
// allocate_new_tlab(). |
|
537 |
// |
|
9997
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
538 |
// * All non-TLAB allocation requests should go to mem_allocate(). |
7398 | 539 |
// |
540 |
// * If either call cannot satisfy the allocation request using the |
|
541 |
// current allocating region, they will try to get a new one. If |
|
542 |
// this fails, they will attempt to do an evacuation pause and |
|
543 |
// retry the allocation. |
|
544 |
// |
|
545 |
// * If all allocation attempts fail, even after trying to schedule |
|
546 |
// an evacuation pause, allocate_new_tlab() will return NULL, |
|
547 |
// whereas mem_allocate() will attempt a heap expansion and/or |
|
548 |
// schedule a Full GC. |
|
549 |
// |
|
550 |
// * We do not allow humongous-sized TLABs. So, allocate_new_tlab |
|
551 |
// should never be called with word_size being humongous. All |
|
552 |
// humongous allocation requests should go to mem_allocate() which |
|
553 |
// will satisfy them with a special path. |
|
554 |
||
555 |
virtual HeapWord* allocate_new_tlab(size_t word_size); |
|
556 |
||
557 |
virtual HeapWord* mem_allocate(size_t word_size, |
|
558 |
bool* gc_overhead_limit_was_exceeded); |
|
1374 | 559 |
|
8928
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
560 |
// The following three methods take a gc_count_before_ret |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
561 |
// parameter which is used to return the GC count if the method |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
562 |
// returns NULL. Given that we are required to read the GC count |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
563 |
// while holding the Heap_lock, and these paths will take the |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
564 |
// Heap_lock at some point, it's easier to get them to read the GC |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
565 |
// count while holding the Heap_lock before they return NULL instead |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
566 |
// of the caller (namely: mem_allocate()) having to also take the |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
567 |
// Heap_lock just to read the GC count. |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
568 |
|
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
569 |
// First-level mutator allocation attempt: try to allocate out of |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
570 |
// the mutator alloc region without taking the Heap_lock. This |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
571 |
// should only be used for non-humongous allocations. |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
572 |
inline HeapWord* attempt_allocation(size_t word_size, |
16604
800a65bfe347
7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents:
15608
diff
changeset
|
573 |
unsigned int* gc_count_before_ret, |
800a65bfe347
7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents:
15608
diff
changeset
|
574 |
int* gclocker_retry_count_ret); |
1374 | 575 |
|
8928
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
576 |
// Second-level mutator allocation attempt: take the Heap_lock and |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
577 |
// retry the allocation attempt, potentially scheduling a GC |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
578 |
// pause. This should only be used for non-humongous allocations. |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
579 |
HeapWord* attempt_allocation_slow(size_t word_size, |
16604
800a65bfe347
7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents:
15608
diff
changeset
|
580 |
unsigned int* gc_count_before_ret, |
800a65bfe347
7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents:
15608
diff
changeset
|
581 |
int* gclocker_retry_count_ret); |
7905
cc7740616b03
6994297: G1: do first-level slow-path allocations with a CAS
tonyp
parents:
7904
diff
changeset
|
582 |
|
8928
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
583 |
// Takes the Heap_lock and attempts a humongous allocation. It can |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
584 |
// potentially schedule a GC pause. |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
585 |
HeapWord* attempt_allocation_humongous(size_t word_size, |
16604
800a65bfe347
7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents:
15608
diff
changeset
|
586 |
unsigned int* gc_count_before_ret, |
800a65bfe347
7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents:
15608
diff
changeset
|
587 |
int* gclocker_retry_count_ret); |
7398 | 588 |
|
8928
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
589 |
// Allocation attempt that should be called during safepoints (e.g., |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
590 |
// at the end of a successful GC). expect_null_mutator_alloc_region |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
591 |
// specifies whether the mutator alloc region is expected to be NULL |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
592 |
// or not. |
7398 | 593 |
HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
8928
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
594 |
bool expect_null_mutator_alloc_region); |
7398 | 595 |
|
596 |
// It dirties the cards that cover the block so that so that the post |
|
597 |
// write barrier never queues anything when updating objects on this |
|
598 |
// block. It is assumed (and in fact we assert) that the block |
|
599 |
// belongs to a young region. |
|
600 |
inline void dirty_young_block(HeapWord* start, size_t word_size); |
|
1374 | 601 |
|
602 |
// Allocate blocks during garbage collection. Will ensure an |
|
603 |
// allocation region, either by picking one or expanding the |
|
604 |
// heap, and then allocate a block of the given size. The block |
|
605 |
// may not be a humongous - it must fit into a single heap region. |
|
606 |
HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); |
|
607 |
||
608 |
// Ensure that no further allocations can happen in "r", bearing in mind |
|
609 |
// that parallel threads might be attempting allocations. |
|
610 |
void par_allocate_remaining_space(HeapRegion* r); |
|
611 |
||
10243
d00a21009f1f
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
10236
diff
changeset
|
612 |
// Allocation attempt during GC for a survivor object / PLAB. |
d00a21009f1f
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
10236
diff
changeset
|
613 |
inline HeapWord* survivor_attempt_allocation(size_t word_size); |
2009 | 614 |
|
10243
d00a21009f1f
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
10236
diff
changeset
|
615 |
// Allocation attempt during GC for an old object / PLAB. |
d00a21009f1f
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
10236
diff
changeset
|
616 |
inline HeapWord* old_attempt_allocation(size_t word_size); |
8928
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
617 |
|
10243
d00a21009f1f
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
10236
diff
changeset
|
618 |
// These methods are the "callbacks" from the G1AllocRegion class. |
d00a21009f1f
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
10236
diff
changeset
|
619 |
|
d00a21009f1f
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
10236
diff
changeset
|
620 |
// For mutator alloc regions. |
8928
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
621 |
HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
622 |
void retire_mutator_alloc_region(HeapRegion* alloc_region, |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
623 |
size_t allocated_bytes); |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
624 |
|
10243
d00a21009f1f
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
10236
diff
changeset
|
625 |
// For GC alloc regions. |
12381
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
626 |
HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
10243
d00a21009f1f
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
10236
diff
changeset
|
627 |
GCAllocPurpose ap); |
d00a21009f1f
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
10236
diff
changeset
|
628 |
void retire_gc_alloc_region(HeapRegion* alloc_region, |
d00a21009f1f
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
10236
diff
changeset
|
629 |
size_t allocated_bytes, GCAllocPurpose ap); |
d00a21009f1f
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
10236
diff
changeset
|
630 |
|
6058
9c9aec6ab47d
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
5891
diff
changeset
|
631 |
// - if explicit_gc is true, the GC is for a System.gc() or a heap |
7398 | 632 |
// inspection request and should collect the entire heap |
633 |
// - if clear_all_soft_refs is true, all soft references should be |
|
634 |
// cleared during the GC |
|
6058
9c9aec6ab47d
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
5891
diff
changeset
|
635 |
// - if explicit_gc is false, word_size describes the allocation that |
7398 | 636 |
// the GC should attempt (at least) to satisfy |
637 |
// - it returns false if it is unable to do the collection due to the |
|
638 |
// GC locker being active, true otherwise |
|
639 |
bool do_collection(bool explicit_gc, |
|
6058
9c9aec6ab47d
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
5891
diff
changeset
|
640 |
bool clear_all_soft_refs, |
1374 | 641 |
size_t word_size); |
642 |
||
643 |
// Callback from VM_G1CollectFull operation. |
|
644 |
// Perform a full collection. |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
645 |
virtual void do_full_collection(bool clear_all_soft_refs); |
1374 | 646 |
|
647 |
// Resize the heap if necessary after a full collection. If this is |
|
648 |
// after a collect-for allocation, "word_size" is the allocation size, |
|
649 |
// and will be considered part of the used portion of the heap. |
|
650 |
void resize_if_necessary_after_full_collection(size_t word_size); |
|
651 |
||
652 |
// Callback from VM_G1CollectForAllocation operation. |
|
653 |
// This function does everything necessary/possible to satisfy a |
|
654 |
// failed allocation request (including collection, expansion, etc.) |
|
7398 | 655 |
HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
1374 | 656 |
|
657 |
// Attempting to expand the heap sufficiently |
|
658 |
// to support an allocation of the given "word_size". If |
|
659 |
// successful, perform the allocation and return the address of the |
|
660 |
// allocated block, or else "NULL". |
|
7398 | 661 |
HeapWord* expand_and_allocate(size_t word_size); |
1374 | 662 |
|
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
663 |
// Process any reference objects discovered during |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
664 |
// an incremental evacuation pause. |
13926 | 665 |
void process_discovered_references(uint no_of_gc_workers); |
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
666 |
|
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
667 |
// Enqueue any remaining discovered references |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
668 |
// after processing. |
13926 | 669 |
void enqueue_discovered_references(uint no_of_gc_workers); |
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
670 |
|
1374 | 671 |
public: |
9338
05ee447bd420
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
9334
diff
changeset
|
672 |
|
10671
431ff8629f97
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
10670
diff
changeset
|
673 |
G1MonitoringSupport* g1mm() { |
431ff8629f97
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
10670
diff
changeset
|
674 |
assert(_g1mm != NULL, "should have been initialized"); |
431ff8629f97
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
10670
diff
changeset
|
675 |
return _g1mm; |
431ff8629f97
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
10670
diff
changeset
|
676 |
} |
9338
05ee447bd420
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
9334
diff
changeset
|
677 |
|
1374 | 678 |
// Expand the garbage-first heap by at least the given size (in bytes!). |
8103
65eafe3fb3c7
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
8072
diff
changeset
|
679 |
// Returns true if the heap was expanded by the requested amount; |
65eafe3fb3c7
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
8072
diff
changeset
|
680 |
// false otherwise. |
1374 | 681 |
// (Rounds up to a HeapRegion boundary.) |
8103
65eafe3fb3c7
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
8072
diff
changeset
|
682 |
bool expand(size_t expand_bytes); |
1374 | 683 |
|
684 |
// Do anything common to GC's. |
|
685 |
virtual void gc_prologue(bool full); |
|
686 |
virtual void gc_epilogue(bool full); |
|
687 |
||
1902 | 688 |
// We register a region with the fast "in collection set" test. We |
689 |
// simply set to true the array slot corresponding to this region. |
|
690 |
void register_region_with_in_cset_fast_test(HeapRegion* r) { |
|
691 |
assert(_in_cset_fast_test_base != NULL, "sanity"); |
|
692 |
assert(r->in_collection_set(), "invariant"); |
|
12381
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
693 |
uint index = r->hrs_index(); |
9989 | 694 |
assert(index < _in_cset_fast_test_length, "invariant"); |
1902 | 695 |
assert(!_in_cset_fast_test_base[index], "invariant"); |
696 |
_in_cset_fast_test_base[index] = true; |
|
697 |
} |
|
698 |
||
699 |
// This is a fast test on whether a reference points into the |
|
700 |
// collection set or not. It does not assume that the reference |
|
701 |
// points into the heap; if it doesn't, it will return false. |
|
702 |
bool in_cset_fast_test(oop obj) { |
|
703 |
assert(_in_cset_fast_test != NULL, "sanity"); |
|
704 |
if (_g1_committed.contains((HeapWord*) obj)) { |
|
705 |
// no need to subtract the bottom of the heap from obj, |
|
706 |
// _in_cset_fast_test is biased |
|
12381
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
707 |
uintx index = (uintx) obj >> HeapRegion::LogOfHRGrainBytes; |
1902 | 708 |
bool ret = _in_cset_fast_test[index]; |
709 |
// let's make sure the result is consistent with what the slower |
|
710 |
// test returns |
|
711 |
assert( ret || !obj_in_cs(obj), "sanity"); |
|
712 |
assert(!ret || obj_in_cs(obj), "sanity"); |
|
713 |
return ret; |
|
714 |
} else { |
|
715 |
return false; |
|
716 |
} |
|
717 |
} |
|
718 |
||
5350
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
5347
diff
changeset
|
719 |
void clear_cset_fast_test() { |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
5347
diff
changeset
|
720 |
assert(_in_cset_fast_test_base != NULL, "sanity"); |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
5347
diff
changeset
|
721 |
memset(_in_cset_fast_test_base, false, |
12381
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
722 |
(size_t) _in_cset_fast_test_length * sizeof(bool)); |
5350
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
5347
diff
changeset
|
723 |
} |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
5347
diff
changeset
|
724 |
|
12934
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
12381
diff
changeset
|
725 |
// This is called at the start of either a concurrent cycle or a Full |
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
12381
diff
changeset
|
726 |
// GC to update the number of old marking cycles started. |
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
12381
diff
changeset
|
727 |
void increment_old_marking_cycles_started(); |
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
12381
diff
changeset
|
728 |
|
6058
9c9aec6ab47d
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
5891
diff
changeset
|
729 |
// This is called at the end of either a concurrent cycle or a Full |
12934
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
12381
diff
changeset
|
730 |
// GC to update the number of old marking cycles completed. Those two |
6058
9c9aec6ab47d
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
5891
diff
changeset
|
731 |
// can happen in a nested fashion, i.e., we start a concurrent |
9c9aec6ab47d
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
5891
diff
changeset
|
732 |
// cycle, a Full GC happens half-way through it which ends first, |
9c9aec6ab47d
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
5891
diff
changeset
|
733 |
// and then the cycle notices that a Full GC happened and ends |
7455
22e19e8c0beb
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
7416
diff
changeset
|
734 |
// too. The concurrent parameter is a boolean to help us do a bit |
22e19e8c0beb
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
7416
diff
changeset
|
735 |
// tighter consistency checking in the method. If concurrent is |
22e19e8c0beb
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
7416
diff
changeset
|
736 |
// false, the caller is the inner caller in the nesting (i.e., the |
22e19e8c0beb
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
7416
diff
changeset
|
737 |
// Full GC). If concurrent is true, the caller is the outer caller |
22e19e8c0beb
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
7416
diff
changeset
|
738 |
// in this nesting (i.e., the concurrent cycle). Further nesting is |
12934
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
12381
diff
changeset
|
739 |
// not currently supported. The end of this call also notifies |
7455
22e19e8c0beb
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
7416
diff
changeset
|
740 |
// the FullGCCount_lock in case a Java thread is waiting for a full |
22e19e8c0beb
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
7416
diff
changeset
|
741 |
// GC to happen (e.g., it called System.gc() with |
6058
9c9aec6ab47d
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
5891
diff
changeset
|
742 |
// +ExplicitGCInvokesConcurrent). |
12934
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
12381
diff
changeset
|
743 |
void increment_old_marking_cycles_completed(bool concurrent); |
6058
9c9aec6ab47d
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
5891
diff
changeset
|
744 |
|
12934
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
12381
diff
changeset
|
745 |
unsigned int old_marking_cycles_completed() { |
f9bc0e664918
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
12381
diff
changeset
|
746 |
return _old_marking_cycles_completed; |
6058
9c9aec6ab47d
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
5891
diff
changeset
|
747 |
} |
9c9aec6ab47d
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
5891
diff
changeset
|
748 |
|
18025 | 749 |
void register_concurrent_cycle_start(jlong start_time); |
750 |
void register_concurrent_cycle_end(); |
|
751 |
void trace_heap_after_concurrent_cycle(); |
|
752 |
||
753 |
G1YCType yc_type(); |
|
754 |
||
10001
8aa7f885326e
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
10000
diff
changeset
|
755 |
G1HRPrinter* hr_printer() { return &_hr_printer; } |
8aa7f885326e
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
10000
diff
changeset
|
756 |
|
1374 | 757 |
protected: |
758 |
||
759 |
// Shrink the garbage-first heap by at most the given size (in bytes!). |
|
760 |
// (Rounds down to a HeapRegion boundary.) |
|
761 |
virtual void shrink(size_t expand_bytes); |
|
762 |
void shrink_helper(size_t expand_bytes); |
|
763 |
||
6251 | 764 |
#if TASKQUEUE_STATS |
765 |
static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); |
|
766 |
void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; |
|
767 |
void reset_taskqueue_stats(); |
|
768 |
#endif // TASKQUEUE_STATS |
|
769 |
||
7398 | 770 |
// Schedule the VM operation that will do an evacuation pause to |
771 |
// satisfy an allocation request of word_size. *succeeded will |
|
772 |
// return whether the VM operation was successful (it did do an |
|
773 |
// evacuation pause) or not (another thread beat us to it or the GC |
|
774 |
// locker was active). Given that we should not be holding the |
|
775 |
// Heap_lock when we enter this method, we will pass the |
|
776 |
// gc_count_before (i.e., total_collections()) as a parameter since |
|
777 |
// it has to be read while holding the Heap_lock. Currently, both |
|
778 |
// methods that call do_collection_pause() release the Heap_lock |
|
779 |
// before the call, so it's easy to read gc_count_before just before. |
|
19549
60e5c7cafdca
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
19339
diff
changeset
|
780 |
HeapWord* do_collection_pause(size_t word_size, |
60e5c7cafdca
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
19339
diff
changeset
|
781 |
unsigned int gc_count_before, |
60e5c7cafdca
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
19339
diff
changeset
|
782 |
bool* succeeded, |
60e5c7cafdca
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
19339
diff
changeset
|
783 |
GCCause::Cause gc_cause); |
1374 | 784 |
|
785 |
// The guts of the incremental collection pause, executed by the vm |
|
7398 | 786 |
// thread. It returns false if it is unable to do the collection due |
787 |
// to the GC locker being active, true otherwise |
|
788 |
bool do_collection_pause_at_safepoint(double target_pause_time_ms); |
|
1374 | 789 |
|
790 |
// Actually do the work of evacuating the collection set. |
|
18025 | 791 |
void evacuate_collection_set(EvacuationInfo& evacuation_info); |
1374 | 792 |
|
793 |
// The g1 remembered set of the heap. |
|
794 |
G1RemSet* _g1_rem_set; |
|
795 |
||
2142
032f4652700c
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
2009
diff
changeset
|
796 |
// A set of cards that cover the objects for which the Rsets should be updated |
032f4652700c
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
2009
diff
changeset
|
797 |
// concurrently after the collection. |
032f4652700c
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
2009
diff
changeset
|
798 |
DirtyCardQueueSet _dirty_card_queue_set; |
032f4652700c
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
2009
diff
changeset
|
799 |
|
1374 | 800 |
// The closure used to refine a single card. |
801 |
RefineCardTableEntryClosure* _refine_cte_cl; |
|
802 |
||
803 |
// A function to check the consistency of dirty card logs. |
|
804 |
void check_ct_logs_at_safepoint(); |
|
805 |
||
6247 | 806 |
// A DirtyCardQueueSet that is used to hold cards that contain |
807 |
// references into the current collection set. This is used to |
|
808 |
// update the remembered sets of the regions in the collection |
|
809 |
// set in the event of an evacuation failure. |
|
810 |
DirtyCardQueueSet _into_cset_dirty_card_queue_set; |
|
811 |
||
1374 | 812 |
// After a collection pause, make the regions in the CS into free |
813 |
// regions. |
|
18025 | 814 |
void free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info); |
1374 | 815 |
|
5350
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
5347
diff
changeset
|
816 |
// Abandon the current collection set without recording policy |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
5347
diff
changeset
|
817 |
// statistics or updating free lists. |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
5347
diff
changeset
|
818 |
void abandon_collection_set(HeapRegion* cs_head); |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
5347
diff
changeset
|
819 |
|
1374 | 820 |
// Applies "scan_non_heap_roots" to roots outside the heap, |
821 |
// "scan_rs" to roots inside the heap (having done "set_region" to |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
822 |
// indicate the region in which the root resides), |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
823 |
// and does "scan_metadata" If "scan_rs" is |
1374 | 824 |
// NULL, then this step is skipped. The "worker_i" |
825 |
// param is for use with parallel roots processing, and should be |
|
826 |
// the "i" of the calling parallel worker thread's work(i) function. |
|
827 |
// In the sequential case this param will be ignored. |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
828 |
void g1_process_strong_roots(bool is_scavenging, |
11754
b003db88c6d6
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
11583
diff
changeset
|
829 |
ScanningOption so, |
1374 | 830 |
OopClosure* scan_non_heap_roots, |
831 |
OopsInHeapRegionClosure* scan_rs, |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
832 |
G1KlassScanClosure* scan_klasses, |
1374 | 833 |
int worker_i); |
834 |
||
835 |
// Apply "blk" to all the weak roots of the system. These include |
|
836 |
// JNI weak roots, the code cache, system dictionary, symbol table, |
|
837 |
// string table, and referents of reachable weak refs. |
|
17105
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
16685
diff
changeset
|
838 |
void g1_process_weak_roots(OopClosure* root_closure); |
1374 | 839 |
|
8680 | 840 |
// Frees a non-humongous region by initializing its contents and |
7923 | 841 |
// adding it to the free list that's passed as a parameter (this is |
842 |
// usually a local list which will be appended to the master free |
|
843 |
// list later). The used bytes of freed regions are accumulated in |
|
844 |
// pre_used. If par is true, the region's RSet will not be freed |
|
845 |
// up. The assumption is that this will be done later. |
|
846 |
void free_region(HeapRegion* hr, |
|
847 |
size_t* pre_used, |
|
848 |
FreeRegionList* free_list, |
|
849 |
bool par); |
|
1374 | 850 |
|
8680 | 851 |
// Frees a humongous region by collapsing it into individual regions |
852 |
// and calling free_region() for each of them. The freed regions |
|
853 |
// will be added to the free list that's passed as a parameter (this |
|
854 |
// is usually a local list which will be appended to the master free |
|
855 |
// list later). The used bytes of freed regions are accumulated in |
|
856 |
// pre_used. If par is true, the region's RSet will not be freed |
|
857 |
// up. The assumption is that this will be done later. |
|
7923 | 858 |
void free_humongous_region(HeapRegion* hr, |
859 |
size_t* pre_used, |
|
860 |
FreeRegionList* free_list, |
|
861 |
HumongousRegionSet* humongous_proxy_set, |
|
862 |
bool par); |
|
1374 | 863 |
|
9989 | 864 |
// Notifies all the necessary spaces that the committed space has |
865 |
// been updated (either expanded or shrunk). It should be called |
|
866 |
// after _g1_storage is updated. |
|
867 |
void update_committed_space(HeapWord* old_end, HeapWord* new_end); |
|
868 |
||
1374 | 869 |
// The concurrent marker (and the thread it runs in.) |
870 |
ConcurrentMark* _cm; |
|
871 |
ConcurrentMarkThread* _cmThread; |
|
872 |
bool _mark_in_progress; |
|
873 |
||
874 |
// The concurrent refiner. |
|
875 |
ConcurrentG1Refine* _cg1r; |
|
876 |
||
877 |
// The parallel task queues |
|
878 |
RefToScanQueueSet *_task_queues; |
|
879 |
||
880 |
// True iff a evacuation has failed in the current collection. |
|
881 |
bool _evacuation_failed; |
|
882 |
||
18025 | 883 |
EvacuationFailedInfo* _evacuation_failed_info_array; |
1374 | 884 |
|
885 |
// Failed evacuations cause some logical from-space objects to have |
|
886 |
// forwarding pointers to themselves. Reset them. |
|
887 |
void remove_self_forwarding_pointers(); |
|
888 |
||
15608
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|
889 |
// Together, these store an object with a preserved mark, and its mark value. |
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|
890 |
Stack<oop, mtGC> _objs_with_preserved_marks; |
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|
891 |
Stack<markOop, mtGC> _preserved_marks_of_objs; |
1374 | 892 |
|
893 |
// Preserve the mark of "obj", if necessary, in preparation for its mark |
|
894 |
// word being overwritten with a self-forwarding-pointer. |
|
895 |
void preserve_mark_if_necessary(oop obj, markOop m); |
|
896 |
||
897 |
// The stack of evac-failure objects left to be scanned. |
|
898 |
GrowableArray<oop>* _evac_failure_scan_stack; |
|
899 |
// The closure to apply to evac-failure objects. |
|
900 |
||
901 |
OopsInHeapRegionClosure* _evac_failure_closure; |
|
902 |
// Set the field above. |
|
903 |
void |
|
904 |
set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { |
|
905 |
_evac_failure_closure = evac_failure_closure; |
|
906 |
} |
|
907 |
||
908 |
// Push "obj" on the scan stack. |
|
909 |
void push_on_evac_failure_scan_stack(oop obj); |
|
910 |
// Process scan stack entries until the stack is empty. |
|
911 |
void drain_evac_failure_scan_stack(); |
|
912 |
// True iff an invocation of "drain_scan_stack" is in progress; to |
|
913 |
// prevent unnecessary recursion. |
|
914 |
bool _drain_in_progress; |
|
915 |
||
916 |
// Do any necessary initialization for evacuation-failure handling. |
|
917 |
// "cl" is the closure that will be used to process evac-failure |
|
918 |
// objects. |
|
919 |
void init_for_evac_failure(OopsInHeapRegionClosure* cl); |
|
920 |
// Do any necessary cleanup for evacuation-failure handling data |
|
921 |
// structures. |
|
922 |
void finalize_for_evac_failure(); |
|
923 |
||
924 |
// An attempt to evacuate "obj" has failed; take necessary steps. |
|
18025 | 925 |
oop handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, oop obj); |
1374 | 926 |
void handle_evacuation_failure_common(oop obj, markOop m); |
927 |
||
13517
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|
928 |
#ifndef PRODUCT |
f158a0c702d4
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|
929 |
// Support for forcing evacuation failures. Analogous to |
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|
930 |
// PromotionFailureALot for the other collectors. |
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|
931 |
|
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|
932 |
// Records whether G1EvacuationFailureALot should be in effect |
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|
933 |
// for the current GC |
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changeset
|
934 |
bool _evacuation_failure_alot_for_current_gc; |
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|
935 |
|
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diff
changeset
|
936 |
// Used to record the GC number for interval checking when |
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|
937 |
// determining whether G1EvaucationFailureALot is in effect |
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|
938 |
// for the current GC. |
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diff
changeset
|
939 |
size_t _evacuation_failure_alot_gc_number; |
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changeset
|
940 |
|
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diff
changeset
|
941 |
// Count of the number of evacuations between failures. |
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changeset
|
942 |
volatile size_t _evacuation_failure_alot_count; |
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changeset
|
943 |
|
f158a0c702d4
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parents:
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diff
changeset
|
944 |
// Set whether G1EvacuationFailureALot should be in effect |
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parents:
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changeset
|
945 |
// for the current GC (based upon the type of GC and which |
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parents:
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changeset
|
946 |
// command line flags are set); |
f158a0c702d4
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parents:
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changeset
|
947 |
inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
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changeset
|
948 |
bool during_initial_mark, |
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parents:
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changeset
|
949 |
bool during_marking); |
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parents:
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diff
changeset
|
950 |
|
f158a0c702d4
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parents:
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diff
changeset
|
951 |
inline void set_evacuation_failure_alot_for_current_gc(); |
f158a0c702d4
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parents:
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diff
changeset
|
952 |
|
f158a0c702d4
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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diff
changeset
|
953 |
// Return true if it's time to cause an evacuation failure. |
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parents:
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changeset
|
954 |
inline bool evacuation_should_fail(); |
f158a0c702d4
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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diff
changeset
|
955 |
|
f158a0c702d4
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parents:
13516
diff
changeset
|
956 |
// Reset the G1EvacuationFailureALot counters. Should be called at |
18025 | 957 |
// the end of an evacuation pause in which an evacuation failure occurred. |
13517
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parents:
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changeset
|
958 |
inline void reset_evacuation_should_fail(); |
f158a0c702d4
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parents:
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diff
changeset
|
959 |
#endif // !PRODUCT |
f158a0c702d4
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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diff
changeset
|
960 |
|
10670
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parents:
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diff
changeset
|
961 |
// ("Weak") Reference processing support. |
4ea0e7d2ffbc
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parents:
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diff
changeset
|
962 |
// |
18025 | 963 |
// G1 has 2 instances of the reference processor class. One |
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
964 |
// (_ref_processor_cm) handles reference object discovery |
4ea0e7d2ffbc
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parents:
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diff
changeset
|
965 |
// and subsequent processing during concurrent marking cycles. |
4ea0e7d2ffbc
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parents:
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diff
changeset
|
966 |
// |
4ea0e7d2ffbc
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parents:
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diff
changeset
|
967 |
// The other (_ref_processor_stw) handles reference object |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
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parents:
10664
diff
changeset
|
968 |
// discovery and processing during full GCs and incremental |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
969 |
// evacuation pauses. |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
970 |
// |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
971 |
// During an incremental pause, reference discovery will be |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
972 |
// temporarily disabled for _ref_processor_cm and will be |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
973 |
// enabled for _ref_processor_stw. At the end of the evacuation |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
974 |
// pause references discovered by _ref_processor_stw will be |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
975 |
// processed and discovery will be disabled. The previous |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
976 |
// setting for reference object discovery for _ref_processor_cm |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
977 |
// will be re-instated. |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
978 |
// |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
979 |
// At the start of marking: |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
980 |
// * Discovery by the CM ref processor is verified to be inactive |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
981 |
// and it's discovered lists are empty. |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
982 |
// * Discovery by the CM ref processor is then enabled. |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
983 |
// |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
984 |
// At the end of marking: |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
985 |
// * Any references on the CM ref processor's discovered |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
986 |
// lists are processed (possibly MT). |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
987 |
// |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
988 |
// At the start of full GC we: |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
989 |
// * Disable discovery by the CM ref processor and |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
990 |
// empty CM ref processor's discovered lists |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
991 |
// (without processing any entries). |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
992 |
// * Verify that the STW ref processor is inactive and it's |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
993 |
// discovered lists are empty. |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
994 |
// * Temporarily set STW ref processor discovery as single threaded. |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
995 |
// * Temporarily clear the STW ref processor's _is_alive_non_header |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
996 |
// field. |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
997 |
// * Finally enable discovery by the STW ref processor. |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
998 |
// |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
999 |
// The STW ref processor is used to record any discovered |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
1000 |
// references during the full GC. |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
1001 |
// |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
1002 |
// At the end of a full GC we: |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
1003 |
// * Enqueue any reference objects discovered by the STW ref processor |
4ea0e7d2ffbc
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johnc
parents:
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diff
changeset
|
1004 |
// that have non-live referents. This has the side-effect of |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
1005 |
// making the STW ref processor inactive by disabling discovery. |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
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parents:
10664
diff
changeset
|
1006 |
// * Verify that the CM ref processor is still inactive |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
1007 |
// and no references have been placed on it's discovered |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
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parents:
10664
diff
changeset
|
1008 |
// lists (also checked as a precondition during initial marking). |
4ea0e7d2ffbc
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parents:
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diff
changeset
|
1009 |
|
4ea0e7d2ffbc
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parents:
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diff
changeset
|
1010 |
// The (stw) reference processor... |
4ea0e7d2ffbc
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parents:
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diff
changeset
|
1011 |
ReferenceProcessor* _ref_processor_stw; |
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parents:
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diff
changeset
|
1012 |
|
18025 | 1013 |
STWGCTimer* _gc_timer_stw; |
1014 |
ConcurrentGCTimer* _gc_timer_cm; |
|
1015 |
||
1016 |
G1OldTracer* _gc_tracer_cm; |
|
1017 |
G1NewTracer* _gc_tracer_stw; |
|
1018 |
||
10670
4ea0e7d2ffbc
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parents:
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diff
changeset
|
1019 |
// During reference object discovery, the _is_alive_non_header |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
1020 |
// closure (if non-null) is applied to the referent object to |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
1021 |
// determine whether the referent is live. If so then the |
4ea0e7d2ffbc
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parents:
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diff
changeset
|
1022 |
// reference object does not need to be 'discovered' and can |
4ea0e7d2ffbc
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parents:
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diff
changeset
|
1023 |
// be treated as a regular oop. This has the benefit of reducing |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
1024 |
// the number of 'discovered' reference objects that need to |
4ea0e7d2ffbc
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johnc
parents:
10664
diff
changeset
|
1025 |
// be processed. |
4ea0e7d2ffbc
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johnc
parents:
10664
diff
changeset
|
1026 |
// |
4ea0e7d2ffbc
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parents:
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diff
changeset
|
1027 |
// Instance of the is_alive closure for embedding into the |
4ea0e7d2ffbc
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changeset
|
1028 |
// STW reference processor as the _is_alive_non_header field. |
4ea0e7d2ffbc
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changeset
|
1029 |
// Supplying a value for the _is_alive_non_header field is |
4ea0e7d2ffbc
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changeset
|
1030 |
// optional but doing so prevents unnecessary additions to |
4ea0e7d2ffbc
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johnc
parents:
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diff
changeset
|
1031 |
// the discovered lists during reference discovery. |
4ea0e7d2ffbc
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parents:
10664
diff
changeset
|
1032 |
G1STWIsAliveClosure _is_alive_closure_stw; |
4ea0e7d2ffbc
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parents:
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changeset
|
1033 |
|
4ea0e7d2ffbc
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parents:
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diff
changeset
|
1034 |
// The (concurrent marking) reference processor... |
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changeset
|
1035 |
ReferenceProcessor* _ref_processor_cm; |
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parents:
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changeset
|
1036 |
|
7657
a80e571c3d96
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
7455
diff
changeset
|
1037 |
// Instance of the concurrent mark is_alive closure for embedding |
10670
4ea0e7d2ffbc
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parents:
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diff
changeset
|
1038 |
// into the Concurrent Marking reference processor as the |
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10664
diff
changeset
|
1039 |
// _is_alive_non_header field. Supplying a value for the |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
1040 |
// _is_alive_non_header field is optional but doing so prevents |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
1041 |
// unnecessary additions to the discovered lists during reference |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
1042 |
// discovery. |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
1043 |
G1CMIsAliveClosure _is_alive_closure_cm; |
1374 | 1044 |
|
11248
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1045 |
// Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1046 |
HeapRegion** _worker_cset_start_region; |
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1047 |
|
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1048 |
// Time stamp to validate the regions recorded in the cache |
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1049 |
// used by G1CollectedHeap::start_cset_region_for_worker(). |
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1050 |
// The heap region entry for a given worker is valid iff |
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1051 |
// the associated time stamp value matches the current value |
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1052 |
// of G1CollectedHeap::_gc_time_stamp. |
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1053 |
unsigned int* _worker_cset_start_region_time_stamp; |
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1054 |
|
1374 | 1055 |
enum G1H_process_strong_roots_tasks { |
11455
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
changeset
|
1056 |
G1H_PS_filter_satb_buffers, |
1374 | 1057 |
G1H_PS_refProcessor_oops_do, |
1058 |
// Leave this one last. |
|
1059 |
G1H_PS_NumElements |
|
1060 |
}; |
|
1061 |
||
1062 |
SubTasksDone* _process_strong_tasks; |
|
1063 |
||
7923 | 1064 |
volatile bool _free_regions_coming; |
1374 | 1065 |
|
1066 |
public: |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
6260
diff
changeset
|
1067 |
|
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
6260
diff
changeset
|
1068 |
SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
6260
diff
changeset
|
1069 |
|
1374 | 1070 |
void set_refine_cte_cl_concurrency(bool concurrent); |
1071 |
||
6251 | 1072 |
RefToScanQueue *task_queue(int i) const; |
1374 | 1073 |
|
2142
032f4652700c
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
2009
diff
changeset
|
1074 |
// A set of cards where updates happened during the GC |
032f4652700c
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
2009
diff
changeset
|
1075 |
DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
032f4652700c
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
2009
diff
changeset
|
1076 |
|
6247 | 1077 |
// A DirtyCardQueueSet that is used to hold cards that contain |
1078 |
// references into the current collection set. This is used to |
|
1079 |
// update the remembered sets of the regions in the collection |
|
1080 |
// set in the event of an evacuation failure. |
|
1081 |
DirtyCardQueueSet& into_cset_dirty_card_queue_set() |
|
1082 |
{ return _into_cset_dirty_card_queue_set; } |
|
1083 |
||
1374 | 1084 |
// Create a G1CollectedHeap with the specified policy. |
1085 |
// Must call the initialize method afterwards. |
|
1086 |
// May not return if something goes wrong. |
|
1087 |
G1CollectedHeap(G1CollectorPolicy* policy); |
|
1088 |
||
1089 |
// Initialize the G1CollectedHeap to have the initial and |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
1090 |
// maximum sizes and remembered and barrier sets |
1374 | 1091 |
// specified by the policy object. |
1092 |
jint initialize(); |
|
1093 |
||
19986
33d188c66ed9
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
19549
diff
changeset
|
1094 |
// Return the (conservative) maximum heap alignment for any G1 heap |
33d188c66ed9
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
19549
diff
changeset
|
1095 |
static size_t conservative_max_heap_alignment(); |
33d188c66ed9
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
19549
diff
changeset
|
1096 |
|
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
1097 |
// Initialize weak reference processing. |
7657
a80e571c3d96
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
7455
diff
changeset
|
1098 |
virtual void ref_processing_init(); |
1374 | 1099 |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11248
diff
changeset
|
1100 |
void set_par_threads(uint t) { |
1374 | 1101 |
SharedHeap::set_par_threads(t); |
11174
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
11169
diff
changeset
|
1102 |
// Done in SharedHeap but oddly there are |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
11169
diff
changeset
|
1103 |
// two _process_strong_tasks's in a G1CollectedHeap |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
11169
diff
changeset
|
1104 |
// so do it here too. |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
11169
diff
changeset
|
1105 |
_process_strong_tasks->set_n_threads(t); |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
11169
diff
changeset
|
1106 |
} |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
11169
diff
changeset
|
1107 |
|
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
11169
diff
changeset
|
1108 |
// Set _n_par_threads according to a policy TBD. |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
11169
diff
changeset
|
1109 |
void set_par_threads(); |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
11169
diff
changeset
|
1110 |
|
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
11169
diff
changeset
|
1111 |
void set_n_termination(int t) { |
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
6260
diff
changeset
|
1112 |
_process_strong_tasks->set_n_threads(t); |
1374 | 1113 |
} |
1114 |
||
1115 |
virtual CollectedHeap::Name kind() const { |
|
1116 |
return CollectedHeap::G1CollectedHeap; |
|
1117 |
} |
|
1118 |
||
1119 |
// The current policy object for the collector. |
|
1120 |
G1CollectorPolicy* g1_policy() const { return _g1_policy; } |
|
1121 |
||
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
1122 |
virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
1123 |
|
1374 | 1124 |
// Adaptive size policy. No such thing for g1. |
1125 |
virtual AdaptiveSizePolicy* size_policy() { return NULL; } |
|
1126 |
||
1127 |
// The rem set and barrier set. |
|
1128 |
G1RemSet* g1_rem_set() const { return _g1_rem_set; } |
|
1129 |
||
1130 |
unsigned get_gc_time_stamp() { |
|
1131 |
return _gc_time_stamp; |
|
1132 |
} |
|
1133 |
||
1134 |
void reset_gc_time_stamp() { |
|
1135 |
_gc_time_stamp = 0; |
|
1385
1751733b089b
6723570: G1: assertion failure: p == current_top or oop(p)->is_oop(),"p is not a block start" (revisited!)
iveresov
parents:
1374
diff
changeset
|
1136 |
OrderAccess::fence(); |
11248
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1137 |
// Clear the cached CSet starting regions and time stamps. |
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1138 |
// Their validity is dependent on the GC timestamp. |
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1139 |
clear_cset_start_regions(); |
1385
1751733b089b
6723570: G1: assertion failure: p == current_top or oop(p)->is_oop(),"p is not a block start" (revisited!)
iveresov
parents:
1374
diff
changeset
|
1140 |
} |
1751733b089b
6723570: G1: assertion failure: p == current_top or oop(p)->is_oop(),"p is not a block start" (revisited!)
iveresov
parents:
1374
diff
changeset
|
1141 |
|
13336
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1142 |
void check_gc_time_stamps() PRODUCT_RETURN; |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1143 |
|
1385
1751733b089b
6723570: G1: assertion failure: p == current_top or oop(p)->is_oop(),"p is not a block start" (revisited!)
iveresov
parents:
1374
diff
changeset
|
1144 |
void increment_gc_time_stamp() { |
1751733b089b
6723570: G1: assertion failure: p == current_top or oop(p)->is_oop(),"p is not a block start" (revisited!)
iveresov
parents:
1374
diff
changeset
|
1145 |
++_gc_time_stamp; |
1751733b089b
6723570: G1: assertion failure: p == current_top or oop(p)->is_oop(),"p is not a block start" (revisited!)
iveresov
parents:
1374
diff
changeset
|
1146 |
OrderAccess::fence(); |
1374 | 1147 |
} |
1148 |
||
13336
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1149 |
// Reset the given region's GC timestamp. If it's starts humongous, |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1150 |
// also reset the GC timestamp of its corresponding |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1151 |
// continues humongous regions too. |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1152 |
void reset_gc_time_stamps(HeapRegion* hr); |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1153 |
|
6247 | 1154 |
void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1155 |
DirtyCardQueue* into_cset_dcq, |
|
1156 |
bool concurrent, int worker_i); |
|
1374 | 1157 |
|
1158 |
// The shared block offset table array. |
|
1159 |
G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } |
|
1160 |
||
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
1161 |
// Reference Processing accessors |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
1162 |
|
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
1163 |
// The STW reference processor.... |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
1164 |
ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
1165 |
|
18025 | 1166 |
// The Concurrent Marking reference processor... |
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10664
diff
changeset
|
1167 |
ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
1374 | 1168 |
|
18025 | 1169 |
ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; } |
1170 |
G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; } |
|
1171 |
||
1374 | 1172 |
virtual size_t capacity() const; |
1173 |
virtual size_t used() const; |
|
3263
23d2d46c6d08
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
3262
diff
changeset
|
1174 |
// This should be called when we're not holding the heap lock. The |
23d2d46c6d08
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
3262
diff
changeset
|
1175 |
// result might be a bit inaccurate. |
23d2d46c6d08
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
3262
diff
changeset
|
1176 |
size_t used_unlocked() const; |
1374 | 1177 |
size_t recalculate_used() const; |
1178 |
||
1179 |
// These virtual functions do the actual allocation. |
|
1180 |
// Some heaps may offer a contiguous region for shared non-blocking |
|
1181 |
// allocation, via inlined code (by exporting the address of the top and |
|
1182 |
// end fields defining the extent of the contiguous allocation region.) |
|
1183 |
// But G1CollectedHeap doesn't yet support this. |
|
1184 |
||
1185 |
// Return an estimate of the maximum allocation that could be performed |
|
1186 |
// without triggering any collection or expansion activity. In a |
|
1187 |
// generational collector, for example, this is probably the largest |
|
1188 |
// allocation that could be supported (without expansion) in the youngest |
|
1189 |
// generation. It is "unsafe" because no locks are taken; the result |
|
1190 |
// should be treated as an approximation, not a guarantee, for use in |
|
1191 |
// heuristic resizing decisions. |
|
1192 |
virtual size_t unsafe_max_alloc(); |
|
1193 |
||
1194 |
virtual bool is_maximal_no_gc() const { |
|
1195 |
return _g1_storage.uncommitted_size() == 0; |
|
1196 |
} |
|
1197 |
||
1198 |
// The total number of regions in the heap. |
|
12381
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
1199 |
uint n_regions() { return _hrs.length(); } |
9989 | 1200 |
|
1201 |
// The max number of regions in the heap. |
|
12381
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
1202 |
uint max_regions() { return _hrs.max_length(); } |
1374 | 1203 |
|
1204 |
// The number of regions that are completely free. |
|
12381
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
1205 |
uint free_regions() { return _free_list.length(); } |
1374 | 1206 |
|
1207 |
// The number of regions that are not completely free. |
|
12381
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
1208 |
uint used_regions() { return n_regions() - free_regions(); } |
1374 | 1209 |
|
1210 |
// The number of regions available for "regular" expansion. |
|
12381
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
1211 |
uint expansion_regions() { return _expansion_regions; } |
1374 | 1212 |
|
9989 | 1213 |
// Factory method for HeapRegion instances. It will return NULL if |
1214 |
// the allocation fails. |
|
12381
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
1215 |
HeapRegion* new_heap_region(uint hrs_index, HeapWord* bottom); |
9989 | 1216 |
|
9418
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
9338
diff
changeset
|
1217 |
void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
9338
diff
changeset
|
1218 |
void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
8928
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
1219 |
void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
1220 |
void verify_dirty_young_regions() PRODUCT_RETURN; |
e5c53268bef5
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
8927
diff
changeset
|
1221 |
|
7923 | 1222 |
// verify_region_sets() performs verification over the region |
1223 |
// lists. It will be compiled in the product code to be used when |
|
1224 |
// necessary (i.e., during heap verification). |
|
1225 |
void verify_region_sets(); |
|
1374 | 1226 |
|
7923 | 1227 |
// verify_region_sets_optional() is planted in the code for |
1228 |
// list verification in non-product builds (and it can be enabled in |
|
18025 | 1229 |
// product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1). |
7923 | 1230 |
#if HEAP_REGION_SET_FORCE_VERIFY |
1231 |
void verify_region_sets_optional() { |
|
1232 |
verify_region_sets(); |
|
1233 |
} |
|
1234 |
#else // HEAP_REGION_SET_FORCE_VERIFY |
|
1235 |
void verify_region_sets_optional() { } |
|
1236 |
#endif // HEAP_REGION_SET_FORCE_VERIFY |
|
1374 | 1237 |
|
7923 | 1238 |
#ifdef ASSERT |
8680 | 1239 |
bool is_on_master_free_list(HeapRegion* hr) { |
7923 | 1240 |
return hr->containing_set() == &_free_list; |
1241 |
} |
|
1374 | 1242 |
|
8680 | 1243 |
bool is_in_humongous_set(HeapRegion* hr) { |
7923 | 1244 |
return hr->containing_set() == &_humongous_set; |
8680 | 1245 |
} |
7923 | 1246 |
#endif // ASSERT |
1374 | 1247 |
|
7923 | 1248 |
// Wrapper for the region list operations that can be called from |
1249 |
// methods outside this class. |
|
1374 | 1250 |
|
7923 | 1251 |
void secondary_free_list_add_as_tail(FreeRegionList* list) { |
1252 |
_secondary_free_list.add_as_tail(list); |
|
1253 |
} |
|
1374 | 1254 |
|
7923 | 1255 |
void append_secondary_free_list() { |
8927
461fa7ee5254
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
tonyp
parents:
8680
diff
changeset
|
1256 |
_free_list.add_as_head(&_secondary_free_list); |
7923 | 1257 |
} |
1374 | 1258 |
|
8680 | 1259 |
void append_secondary_free_list_if_not_empty_with_lock() { |
1260 |
// If the secondary free list looks empty there's no reason to |
|
1261 |
// take the lock and then try to append it. |
|
7923 | 1262 |
if (!_secondary_free_list.is_empty()) { |
1263 |
MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
|
1264 |
append_secondary_free_list(); |
|
1265 |
} |
|
1266 |
} |
|
1374 | 1267 |
|
10996 | 1268 |
void old_set_remove(HeapRegion* hr) { |
1269 |
_old_set.remove(hr); |
|
1270 |
} |
|
1271 |
||
11576
e0bef5ca4602
6976060: G1: humongous object allocations should initiate marking cycles when necessary
brutisso
parents:
11455
diff
changeset
|
1272 |
size_t non_young_capacity_bytes() { |
e0bef5ca4602
6976060: G1: humongous object allocations should initiate marking cycles when necessary
brutisso
parents:
11455
diff
changeset
|
1273 |
return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
e0bef5ca4602
6976060: G1: humongous object allocations should initiate marking cycles when necessary
brutisso
parents:
11455
diff
changeset
|
1274 |
} |
e0bef5ca4602
6976060: G1: humongous object allocations should initiate marking cycles when necessary
brutisso
parents:
11455
diff
changeset
|
1275 |
|
7923 | 1276 |
void set_free_regions_coming(); |
1277 |
void reset_free_regions_coming(); |
|
1278 |
bool free_regions_coming() { return _free_regions_coming; } |
|
1279 |
void wait_while_free_regions_coming(); |
|
1374 | 1280 |
|
11756
28b6fe22e43d
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
11754
diff
changeset
|
1281 |
// Determine whether the given region is one that we are using as an |
28b6fe22e43d
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
11754
diff
changeset
|
1282 |
// old GC alloc region. |
28b6fe22e43d
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
11754
diff
changeset
|
1283 |
bool is_old_gc_alloc_region(HeapRegion* hr) { |
28b6fe22e43d
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
11754
diff
changeset
|
1284 |
return hr == _retained_old_gc_alloc_region; |
28b6fe22e43d
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
11754
diff
changeset
|
1285 |
} |
28b6fe22e43d
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
11754
diff
changeset
|
1286 |
|
1374 | 1287 |
// Perform a collection of the heap; intended for use in implementing |
1288 |
// "System.gc". This probably implies as full a collection as the |
|
1289 |
// "CollectedHeap" supports. |
|
1290 |
virtual void collect(GCCause::Cause cause); |
|
1291 |
||
1292 |
// The same as above but assume that the caller holds the Heap_lock. |
|
1293 |
void collect_locked(GCCause::Cause cause); |
|
1294 |
||
18025 | 1295 |
// True iff an evacuation has failed in the most-recent collection. |
1374 | 1296 |
bool evacuation_failed() { return _evacuation_failed; } |
1297 |
||
7923 | 1298 |
// It will free a region if it has allocated objects in it that are |
1299 |
// all dead. It calls either free_region() or |
|
1300 |
// free_humongous_region() depending on the type of the region that |
|
1301 |
// is passed to it. |
|
8072 | 1302 |
void free_region_if_empty(HeapRegion* hr, |
1303 |
size_t* pre_used, |
|
1304 |
FreeRegionList* free_list, |
|
10996 | 1305 |
OldRegionSet* old_proxy_set, |
8072 | 1306 |
HumongousRegionSet* humongous_proxy_set, |
1307 |
HRRSCleanupTask* hrrs_cleanup_task, |
|
1308 |
bool par); |
|
1374 | 1309 |
|
7923 | 1310 |
// It appends the free list to the master free list and updates the |
1311 |
// master humongous list according to the contents of the proxy |
|
1312 |
// list. It also adjusts the total used bytes according to pre_used |
|
1313 |
// (if par is true, it will do so by taking the ParGCRareEvent_lock). |
|
1314 |
void update_sets_after_freeing_regions(size_t pre_used, |
|
1315 |
FreeRegionList* free_list, |
|
10996 | 1316 |
OldRegionSet* old_proxy_set, |
7923 | 1317 |
HumongousRegionSet* humongous_proxy_set, |
1318 |
bool par); |
|
1374 | 1319 |
|
11247 | 1320 |
// Returns "TRUE" iff "p" points into the committed areas of the heap. |
1374 | 1321 |
virtual bool is_in(const void* p) const; |
1322 |
||
1323 |
// Return "TRUE" iff the given object address is within the collection |
|
1324 |
// set. |
|
1325 |
inline bool obj_in_cs(oop obj); |
|
1326 |
||
1327 |
// Return "TRUE" iff the given object address is in the reserved |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
1328 |
// region of g1. |
1374 | 1329 |
bool is_in_g1_reserved(const void* p) const { |
1330 |
return _g1_reserved.contains(p); |
|
1331 |
} |
|
1332 |
||
8930
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8928
diff
changeset
|
1333 |
// Returns a MemRegion that corresponds to the space that has been |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8928
diff
changeset
|
1334 |
// reserved for the heap |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8928
diff
changeset
|
1335 |
MemRegion g1_reserved() { |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8928
diff
changeset
|
1336 |
return _g1_reserved; |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8928
diff
changeset
|
1337 |
} |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8928
diff
changeset
|
1338 |
|
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8928
diff
changeset
|
1339 |
// Returns a MemRegion that corresponds to the space that has been |
1374 | 1340 |
// committed in the heap |
1341 |
MemRegion g1_committed() { |
|
1342 |
return _g1_committed; |
|
1343 |
} |
|
1344 |
||
8485 | 1345 |
virtual bool is_in_closed_subset(const void* p) const; |
1374 | 1346 |
|
20309 | 1347 |
G1SATBCardTableModRefBS* g1_barrier_set() { |
1348 |
return (G1SATBCardTableModRefBS*) barrier_set(); |
|
1349 |
} |
|
1350 |
||
1374 | 1351 |
// This resets the card table to all zeros. It is used after |
1352 |
// a collection pause which used the card table to claim cards. |
|
1353 |
void cleanUpCardTable(); |
|
1354 |
||
1355 |
// Iteration functions. |
|
1356 |
||
1357 |
// Iterate over all the ref-containing fields of all objects, calling |
|
1358 |
// "cl.do_oop" on each. |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
1359 |
virtual void oop_iterate(ExtendedOopClosure* cl); |
1374 | 1360 |
|
1361 |
// Same as above, restricted to a memory region. |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
1362 |
void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
1374 | 1363 |
|
1364 |
// Iterate over all objects, calling "cl.do_object" on each. |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
1365 |
virtual void object_iterate(ObjectClosure* cl); |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
1366 |
|
2345 | 1367 |
virtual void safe_object_iterate(ObjectClosure* cl) { |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
1368 |
object_iterate(cl); |
2345 | 1369 |
} |
1374 | 1370 |
|
1371 |
// Iterate over all spaces in use in the heap, in ascending address order. |
|
1372 |
virtual void space_iterate(SpaceClosure* cl); |
|
1373 |
||
1374 |
// Iterate over heap regions, in address order, terminating the |
|
1375 |
// iteration early if the "doHeapRegion" method returns "true". |
|
9989 | 1376 |
void heap_region_iterate(HeapRegionClosure* blk) const; |
1374 | 1377 |
|
9989 | 1378 |
// Return the region with the given index. It assumes the index is valid. |
12381
1438e0fbfa27
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
12379
diff
changeset
|
1379 |
HeapRegion* region_at(uint index) const { return _hrs.at(index); } |
1374 | 1380 |
|
1381 |
// Divide the heap region sequence into "chunks" of some size (the number |
|
1382 |
// of regions divided by the number of parallel threads times some |
|
1383 |
// overpartition factor, currently 4). Assumes that this will be called |
|
1384 |
// in parallel by ParallelGCThreads worker threads with discinct worker |
|
1385 |
// ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel |
|
1386 |
// calls will use the same "claim_value", and that that claim value is |
|
1387 |
// different from the claim_value of any heap region before the start of |
|
1388 |
// the iteration. Applies "blk->doHeapRegion" to each of the regions, by |
|
1389 |
// attempting to claim the first region in each chunk, and, if |
|
1390 |
// successful, applying the closure to each region in the chunk (and |
|
1391 |
// setting the claim value of the second and subsequent regions of the |
|
1392 |
// chunk.) For now requires that "doHeapRegion" always returns "false", |
|
1393 |
// i.e., that a closure never attempt to abort a traversal. |
|
1394 |
void heap_region_par_iterate_chunked(HeapRegionClosure* blk, |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11248
diff
changeset
|
1395 |
uint worker, |
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11248
diff
changeset
|
1396 |
uint no_of_par_workers, |
1374 | 1397 |
jint claim_value); |
1398 |
||
1422 | 1399 |
// It resets all the region claim values to the default. |
1400 |
void reset_heap_region_claim_values(); |
|
1401 |
||
11451
9c9aa4d85660
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
11449
diff
changeset
|
1402 |
// Resets the claim values of regions in the current |
9c9aa4d85660
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
11449
diff
changeset
|
1403 |
// collection set to the default. |
9c9aa4d85660
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
11449
diff
changeset
|
1404 |
void reset_cset_heap_region_claim_values(); |
9c9aa4d85660
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
11449
diff
changeset
|
1405 |
|
1387 | 1406 |
#ifdef ASSERT |
1407 |
bool check_heap_region_claim_values(jint claim_value); |
|
11176
9bb1ddd8da51
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
11174
diff
changeset
|
1408 |
|
9bb1ddd8da51
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
11174
diff
changeset
|
1409 |
// Same as the routine above but only checks regions in the |
9bb1ddd8da51
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
11174
diff
changeset
|
1410 |
// current collection set. |
9bb1ddd8da51
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
11174
diff
changeset
|
1411 |
bool check_cset_heap_region_claim_values(jint claim_value); |
1387 | 1412 |
#endif // ASSERT |
1413 |
||
11248
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1414 |
// Clear the cached cset start regions and (more importantly) |
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1415 |
// the time stamps. Called when we reset the GC time stamp. |
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1416 |
void clear_cset_start_regions(); |
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1417 |
|
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1418 |
// Given the id of a worker, obtain or calculate a suitable |
5ff61b0fdf3d
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
11247
diff
changeset
|
1419 |
// starting region for iterating over the current collection set. |
11176
9bb1ddd8da51
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
11174
diff
changeset
|
1420 |
HeapRegion* start_cset_region_for_worker(int worker_i); |
9bb1ddd8da51
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
11174
diff
changeset
|
1421 |
|
13336
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1422 |
// This is a convenience method that is used by the |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1423 |
// HeapRegionIterator classes to calculate the starting region for |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1424 |
// each worker so that they do not all start from the same region. |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1425 |
HeapRegion* start_region_for_worker(uint worker_i, uint no_of_par_workers); |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1426 |
|
1374 | 1427 |
// Iterate over the regions (if any) in the current collection set. |
1428 |
void collection_set_iterate(HeapRegionClosure* blk); |
|
1429 |
||
1430 |
// As above but starting from region r |
|
1431 |
void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); |
|
1432 |
||
1433 |
// Returns the first (lowest address) compactible space in the heap. |
|
1434 |
virtual CompactibleSpace* first_compactible_space(); |
|
1435 |
||
1436 |
// A CollectedHeap will contain some number of spaces. This finds the |
|
1437 |
// space containing a given address, or else returns NULL. |
|
1438 |
virtual Space* space_containing(const void* addr) const; |
|
1439 |
||
1440 |
// A G1CollectedHeap will contain some number of heap regions. This |
|
1441 |
// finds the region containing a given address, or else returns NULL. |
|
9989 | 1442 |
template <class T> |
1443 |
inline HeapRegion* heap_region_containing(const T addr) const; |
|
1374 | 1444 |
|
1445 |
// Like the above, but requires "addr" to be in the heap (to avoid a |
|
1446 |
// null-check), and unlike the above, may return an continuing humongous |
|
1447 |
// region. |
|
9989 | 1448 |
template <class T> |
1449 |
inline HeapRegion* heap_region_containing_raw(const T addr) const; |
|
1374 | 1450 |
|
1451 |
// A CollectedHeap is divided into a dense sequence of "blocks"; that is, |
|
1452 |
// each address in the (reserved) heap is a member of exactly |
|
1453 |
// one block. The defining characteristic of a block is that it is |
|
1454 |
// possible to find its size, and thus to progress forward to the next |
|
1455 |
// block. (Blocks may be of different sizes.) Thus, blocks may |
|
1456 |
// represent Java objects, or they might be free blocks in a |
|
1457 |
// free-list-based heap (or subheap), as long as the two kinds are |
|
1458 |
// distinguishable and the size of each is determinable. |
|
1459 |
||
1460 |
// Returns the address of the start of the "block" that contains the |
|
1461 |
// address "addr". We say "blocks" instead of "object" since some heaps |
|
1462 |
// may not pack objects densely; a chunk may either be an object or a |
|
1463 |
// non-object. |
|
1464 |
virtual HeapWord* block_start(const void* addr) const; |
|
1465 |
||
1466 |
// Requires "addr" to be the start of a chunk, and returns its size. |
|
1467 |
// "addr + size" is required to be the start of a new chunk, or the end |
|
1468 |
// of the active area of the heap. |
|
1469 |
virtual size_t block_size(const HeapWord* addr) const; |
|
1470 |
||
1471 |
// Requires "addr" to be the start of a block, and returns "TRUE" iff |
|
1472 |
// the block is an object. |
|
1473 |
virtual bool block_is_obj(const HeapWord* addr) const; |
|
1474 |
||
1475 |
// Does this heap support heap inspection? (+PrintClassHistogram) |
|
1476 |
virtual bool supports_heap_inspection() const { return true; } |
|
1477 |
||
1478 |
// Section on thread-local allocation buffers (TLABs) |
|
1479 |
// See CollectedHeap for semantics. |
|
1480 |
||
1481 |
virtual bool supports_tlab_allocation() const; |
|
1482 |
virtual size_t tlab_capacity(Thread* thr) const; |
|
1483 |
virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; |
|
1484 |
||
1485 |
// Can a compiler initialize a new object without store barriers? |
|
1486 |
// This permission only extends from the creation of a new object |
|
4030
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1487 |
// via a TLAB up to the first subsequent safepoint. If such permission |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1488 |
// is granted for this heap type, the compiler promises to call |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1489 |
// defer_store_barrier() below on any slow path allocation of |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1490 |
// a new object for which such initializing store barriers will |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1491 |
// have been elided. G1, like CMS, allows this, but should be |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1492 |
// ready to provide a compensating write barrier as necessary |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1493 |
// if that storage came out of a non-young region. The efficiency |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1494 |
// of this implementation depends crucially on being able to |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1495 |
// answer very efficiently in constant time whether a piece of |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1496 |
// storage in the heap comes from a young region or not. |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1497 |
// See ReduceInitialCardMarks. |
1374 | 1498 |
virtual bool can_elide_tlab_store_barriers() const { |
10679
f598a613d73e
7005808: G1: re-enable ReduceInitialCardMarks for G1
brutisso
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10671
diff
changeset
|
1499 |
return true; |
4030
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1500 |
} |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1501 |
|
4637 | 1502 |
virtual bool card_mark_must_follow_store() const { |
1503 |
return true; |
|
1504 |
} |
|
1505 |
||
9989 | 1506 |
bool is_in_young(const oop obj) { |
4030
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1507 |
HeapRegion* hr = heap_region_containing(obj); |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1508 |
return hr != NULL && hr->is_young(); |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1509 |
} |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1510 |
|
9935
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9418
diff
changeset
|
1511 |
#ifdef ASSERT |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9418
diff
changeset
|
1512 |
virtual bool is_in_partial_collection(const void* p); |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9418
diff
changeset
|
1513 |
#endif |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9418
diff
changeset
|
1514 |
|
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9418
diff
changeset
|
1515 |
virtual bool is_scavengable(const void* addr); |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9418
diff
changeset
|
1516 |
|
4030
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1517 |
// We don't need barriers for initializing stores to objects |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1518 |
// in the young gen: for the SATB pre-barrier, there is no |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1519 |
// pre-value that needs to be remembered; for the remembered-set |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1520 |
// update logging post-barrier, we don't maintain remembered set |
10280
3463715b5ef7
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
10243
diff
changeset
|
1521 |
// information for young gen objects. |
4030
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1522 |
virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
4c471254865e
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
3697
diff
changeset
|
1523 |
return is_in_young(new_obj); |
1374 | 1524 |
} |
1525 |
||
1526 |
// Returns "true" iff the given word_size is "very large". |
|
1527 |
static bool isHumongous(size_t word_size) { |
|
5078
e865c7385a24
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
5076
diff
changeset
|
1528 |
// Note this has to be strictly greater-than as the TLABs |
e865c7385a24
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
5076
diff
changeset
|
1529 |
// are capped at the humongous thresold and we want to |
e865c7385a24
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
5076
diff
changeset
|
1530 |
// ensure that we don't try to allocate a TLAB as |
e865c7385a24
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
5076
diff
changeset
|
1531 |
// humongous and that we don't allocate a humongous |
e865c7385a24
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
5076
diff
changeset
|
1532 |
// object in a TLAB. |
e865c7385a24
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
5076
diff
changeset
|
1533 |
return word_size > _humongous_object_threshold_in_words; |
1374 | 1534 |
} |
1535 |
||
1536 |
// Update mod union table with the set of dirty cards. |
|
1537 |
void updateModUnion(); |
|
1538 |
||
1539 |
// Set the mod union bits corresponding to the given memRegion. Note |
|
1540 |
// that this is always a safe operation, since it doesn't clear any |
|
1541 |
// bits. |
|
1542 |
void markModUnionRange(MemRegion mr); |
|
1543 |
||
1544 |
// Records the fact that a marking phase is no longer in progress. |
|
1545 |
void set_marking_complete() { |
|
1546 |
_mark_in_progress = false; |
|
1547 |
} |
|
1548 |
void set_marking_started() { |
|
1549 |
_mark_in_progress = true; |
|
1550 |
} |
|
1551 |
bool mark_in_progress() { |
|
1552 |
return _mark_in_progress; |
|
1553 |
} |
|
1554 |
||
1555 |
// Print the maximum heap capacity. |
|
1556 |
virtual size_t max_capacity() const; |
|
1557 |
||
1558 |
virtual jlong millis_since_last_gc(); |
|
1559 |
||
10000
5bbb58b0dbb9
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
9997
diff
changeset
|
1560 |
|
1374 | 1561 |
// Convenience function to be used in situations where the heap type can be |
1562 |
// asserted to be this type. |
|
1563 |
static G1CollectedHeap* heap(); |
|
1564 |
||
1565 |
void set_region_short_lived_locked(HeapRegion* hr); |
|
1566 |
// add appropriate methods for any other surv rate groups |
|
1567 |
||
5350
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
5347
diff
changeset
|
1568 |
YoungList* young_list() { return _young_list; } |
1374 | 1569 |
|
1570 |
// debugging |
|
1571 |
bool check_young_list_well_formed() { |
|
1572 |
return _young_list->check_list_well_formed(); |
|
1573 |
} |
|
5350
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
5347
diff
changeset
|
1574 |
|
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
5347
diff
changeset
|
1575 |
bool check_young_list_empty(bool check_heap, |
1374 | 1576 |
bool check_sample = true); |
1577 |
||
1578 |
// *** Stuff related to concurrent marking. It's not clear to me that so |
|
1579 |
// many of these need to be public. |
|
1580 |
||
1581 |
// The functions below are helper functions that a subclass of |
|
1582 |
// "CollectedHeap" can use in the implementation of its virtual |
|
1583 |
// functions. |
|
1584 |
// This performs a concurrent marking of the live objects in a |
|
1585 |
// bitmap off to the side. |
|
1586 |
void doConcurrentMark(); |
|
1587 |
||
1588 |
bool isMarkedPrev(oop obj) const; |
|
1589 |
bool isMarkedNext(oop obj) const; |
|
1590 |
||
1591 |
// Determine if an object is dead, given the object and also |
|
1592 |
// the region to which the object belongs. An object is dead |
|
1593 |
// iff a) it was not allocated since the last mark and b) it |
|
1594 |
// is not marked. |
|
1595 |
||
1596 |
bool is_obj_dead(const oop obj, const HeapRegion* hr) const { |
|
1597 |
return |
|
1598 |
!hr->obj_allocated_since_prev_marking(obj) && |
|
1599 |
!isMarkedPrev(obj); |
|
1600 |
} |
|
1601 |
||
1602 |
// This function returns true when an object has been |
|
1603 |
// around since the previous marking and hasn't yet |
|
1604 |
// been marked during this marking. |
|
1605 |
||
1606 |
bool is_obj_ill(const oop obj, const HeapRegion* hr) const { |
|
1607 |
return |
|
1608 |
!hr->obj_allocated_since_next_marking(obj) && |
|
1609 |
!isMarkedNext(obj); |
|
1610 |
} |
|
1611 |
||
1612 |
// Determine if an object is dead, given only the object itself. |
|
1613 |
// This will find the region to which the object belongs and |
|
1614 |
// then call the region version of the same function. |
|
1615 |
||
1616 |
// Added if it is NULL it isn't dead. |
|
1617 |
||
9995
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
1618 |
bool is_obj_dead(const oop obj) const { |
3000 | 1619 |
const HeapRegion* hr = heap_region_containing(obj); |
1374 | 1620 |
if (hr == NULL) { |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
1621 |
if (obj == NULL) return false; |
1374 | 1622 |
else return true; |
1623 |
} |
|
1624 |
else return is_obj_dead(obj, hr); |
|
1625 |
} |
|
1626 |
||
9995
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
1627 |
bool is_obj_ill(const oop obj) const { |
3000 | 1628 |
const HeapRegion* hr = heap_region_containing(obj); |
1374 | 1629 |
if (hr == NULL) { |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13517
diff
changeset
|
1630 |
if (obj == NULL) return false; |
1374 | 1631 |
else return true; |
1632 |
} |
|
1633 |
else return is_obj_ill(obj, hr); |
|
1634 |
} |
|
1635 |
||
19339 | 1636 |
bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
1637 |
HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); |
|
1638 |
bool is_marked(oop obj, VerifyOption vo); |
|
1639 |
const char* top_at_mark_start_str(VerifyOption vo); |
|
1640 |
||
1641 |
ConcurrentMark* concurrent_mark() const { return _cm; } |
|
1642 |
||
1643 |
// Refinement |
|
1644 |
||
1645 |
ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } |
|
1646 |
||
1647 |
// The dirty cards region list is used to record a subset of regions |
|
1648 |
// whose cards need clearing. The list if populated during the |
|
1649 |
// remembered set scanning and drained during the card table |
|
1650 |
// cleanup. Although the methods are reentrant, population/draining |
|
1651 |
// phases must not overlap. For synchronization purposes the last |
|
1652 |
// element on the list points to itself. |
|
1653 |
HeapRegion* _dirty_cards_region_list; |
|
1654 |
void push_dirty_cards_region(HeapRegion* hr); |
|
1655 |
HeapRegion* pop_dirty_cards_region(); |
|
1656 |
||
1657 |
// Optimized nmethod scanning support routines |
|
1658 |
||
1659 |
// Register the given nmethod with the G1 heap |
|
1660 |
virtual void register_nmethod(nmethod* nm); |
|
1661 |
||
1662 |
// Unregister the given nmethod from the G1 heap |
|
1663 |
virtual void unregister_nmethod(nmethod* nm); |
|
1664 |
||
1665 |
// Migrate the nmethods in the code root lists of the regions |
|
1666 |
// in the collection set to regions in to-space. In the event |
|
1667 |
// of an evacuation failure, nmethods that reference objects |
|
1668 |
// that were not successfullly evacuated are not migrated. |
|
1669 |
void migrate_strong_code_roots(); |
|
1670 |
||
1671 |
// During an initial mark pause, mark all the code roots that |
|
1672 |
// point into regions *not* in the collection set. |
|
1673 |
void mark_strong_code_roots(uint worker_id); |
|
1674 |
||
1675 |
// Rebuild the stong code root lists for each region |
|
1676 |
// after a full GC |
|
1677 |
void rebuild_strong_code_roots(); |
|
1678 |
||
1679 |
// Verification |
|
1680 |
||
1681 |
// The following is just to alert the verification code |
|
1682 |
// that a full collection has occurred and that the |
|
1683 |
// remembered sets are no longer up to date. |
|
1684 |
bool _full_collection; |
|
1685 |
void set_full_collection() { _full_collection = true;} |
|
1686 |
void clear_full_collection() {_full_collection = false;} |
|
1687 |
bool full_collection() {return _full_collection;} |
|
1688 |
||
1689 |
// Perform any cleanup actions necessary before allowing a verification. |
|
1690 |
virtual void prepare_for_verify(); |
|
1691 |
||
1692 |
// Perform verification. |
|
1693 |
||
1694 |
// vo == UsePrevMarking -> use "prev" marking information, |
|
1695 |
// vo == UseNextMarking -> use "next" marking information |
|
1696 |
// vo == UseMarkWord -> use the mark word in the object header |
|
1697 |
// |
|
1698 |
// NOTE: Only the "prev" marking information is guaranteed to be |
|
1699 |
// consistent most of the time, so most calls to this should use |
|
1700 |
// vo == UsePrevMarking. |
|
1701 |
// Currently, there is only one case where this is called with |
|
1702 |
// vo == UseNextMarking, which is to verify the "next" marking |
|
1703 |
// information at the end of remark. |
|
1704 |
// Currently there is only one place where this is called with |
|
1705 |
// vo == UseMarkWord, which is to verify the marking during a |
|
1706 |
// full GC. |
|
1707 |
void verify(bool silent, VerifyOption vo); |
|
1708 |
||
1709 |
// Override; it uses the "prev" marking information |
|
1710 |
virtual void verify(bool silent); |
|
1711 |
||
13336
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1712 |
// The methods below are here for convenience and dispatch the |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1713 |
// appropriate method depending on value of the given VerifyOption |
19339 | 1714 |
// parameter. The values for that parameter, and their meanings, |
1715 |
// are the same as those above. |
|
13336
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
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diff
changeset
|
1716 |
|
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1717 |
bool is_obj_dead_cond(const oop obj, |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1718 |
const HeapRegion* hr, |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1719 |
const VerifyOption vo) const { |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1720 |
switch (vo) { |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1721 |
case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj, hr); |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1722 |
case VerifyOption_G1UseNextMarking: return is_obj_ill(obj, hr); |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1723 |
case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1724 |
default: ShouldNotReachHere(); |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1725 |
} |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1726 |
return false; // keep some compilers happy |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1727 |
} |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1728 |
|
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1729 |
bool is_obj_dead_cond(const oop obj, |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1730 |
const VerifyOption vo) const { |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1731 |
switch (vo) { |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1732 |
case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj); |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1733 |
case VerifyOption_G1UseNextMarking: return is_obj_ill(obj); |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1734 |
case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1735 |
default: ShouldNotReachHere(); |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1736 |
} |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1737 |
return false; // keep some compilers happy |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1738 |
} |
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1739 |
|
19339 | 1740 |
// Printing |
13336
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
13195
diff
changeset
|
1741 |
|
19339 | 1742 |
virtual void print_on(outputStream* st) const; |
1743 |
virtual void print_extended_on(outputStream* st) const; |
|
1744 |
virtual void print_on_error(outputStream* st) const; |
|
1374 | 1745 |
|
19339 | 1746 |
virtual void print_gc_threads_on(outputStream* st) const; |
1747 |
virtual void gc_threads_do(ThreadClosure* tc) const; |
|
1374 | 1748 |
|
19339 | 1749 |
// Override |
1750 |
void print_tracing_info() const; |
|
1751 |
||
1752 |
// The following two methods are helpful for debugging RSet issues. |
|
1753 |
void print_cset_rsets() PRODUCT_RETURN; |
|
1754 |
void print_all_rsets() PRODUCT_RETURN; |
|
2883
406d1e6d1aa1
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
2345
diff
changeset
|
1755 |
|
1374 | 1756 |
public: |
1757 |
void stop_conc_gc_threads(); |
|
1758 |
||
1759 |
size_t pending_card_num(); |
|
1760 |
size_t cards_scanned(); |
|
1761 |
||
1762 |
protected: |
|
1763 |
size_t _max_heap_capacity; |
|
1764 |
}; |
|
1765 |
||
3262
30d1c247fc25
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|
1766 |
class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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|
1767 |
private: |
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|
1768 |
bool _retired; |
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changeset
|
1769 |
|
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changeset
|
1770 |
public: |
10495
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|
1771 |
G1ParGCAllocBuffer(size_t gclab_word_size); |
3262
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1772 |
|
11455
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|
1773 |
void set_buf(HeapWord* buf) { |
3262
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|
1774 |
ParGCAllocBuffer::set_buf(buf); |
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|
1775 |
_retired = false; |
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|
1776 |
} |
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|
1777 |
|
11455
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|
1778 |
void retire(bool end_of_gc, bool retain) { |
3262
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|
1779 |
if (_retired) |
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changeset
|
1780 |
return; |
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changeset
|
1781 |
ParGCAllocBuffer::retire(end_of_gc, retain); |
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changeset
|
1782 |
_retired = true; |
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changeset
|
1783 |
} |
17856
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changeset
|
1784 |
|
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changeset
|
1785 |
bool is_retired() { |
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changeset
|
1786 |
return _retired; |
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changeset
|
1787 |
} |
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changeset
|
1788 |
}; |
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changeset
|
1789 |
|
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|
1790 |
class G1ParGCAllocBufferContainer { |
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|
1791 |
protected: |
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|
1792 |
static int const _priority_max = 2; |
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|
1793 |
G1ParGCAllocBuffer* _priority_buffer[_priority_max]; |
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|
1794 |
|
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changeset
|
1795 |
public: |
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|
1796 |
G1ParGCAllocBufferContainer(size_t gclab_word_size) { |
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|
1797 |
for (int pr = 0; pr < _priority_max; ++pr) { |
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|
1798 |
_priority_buffer[pr] = new G1ParGCAllocBuffer(gclab_word_size); |
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|
1799 |
} |
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|
1800 |
} |
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changeset
|
1801 |
|
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|
1802 |
~G1ParGCAllocBufferContainer() { |
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|
1803 |
for (int pr = 0; pr < _priority_max; ++pr) { |
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|
1804 |
assert(_priority_buffer[pr]->is_retired(), "alloc buffers should all retire at this point."); |
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|
1805 |
delete _priority_buffer[pr]; |
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changeset
|
1806 |
} |
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changeset
|
1807 |
} |
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changeset
|
1808 |
|
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|
1809 |
HeapWord* allocate(size_t word_sz) { |
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|
1810 |
HeapWord* obj; |
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changeset
|
1811 |
for (int pr = 0; pr < _priority_max; ++pr) { |
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|
1812 |
obj = _priority_buffer[pr]->allocate(word_sz); |
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|
1813 |
if (obj != NULL) return obj; |
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changeset
|
1814 |
} |
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changeset
|
1815 |
return obj; |
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changeset
|
1816 |
} |
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changeset
|
1817 |
|
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changeset
|
1818 |
bool contains(void* addr) { |
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changeset
|
1819 |
for (int pr = 0; pr < _priority_max; ++pr) { |
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changeset
|
1820 |
if (_priority_buffer[pr]->contains(addr)) return true; |
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changeset
|
1821 |
} |
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changeset
|
1822 |
return false; |
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changeset
|
1823 |
} |
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changeset
|
1824 |
|
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changeset
|
1825 |
void undo_allocation(HeapWord* obj, size_t word_sz) { |
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|
1826 |
bool finish_undo; |
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changeset
|
1827 |
for (int pr = 0; pr < _priority_max; ++pr) { |
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changeset
|
1828 |
if (_priority_buffer[pr]->contains(obj)) { |
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changeset
|
1829 |
_priority_buffer[pr]->undo_allocation(obj, word_sz); |
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changeset
|
1830 |
finish_undo = true; |
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changeset
|
1831 |
} |
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changeset
|
1832 |
} |
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changeset
|
1833 |
if (!finish_undo) ShouldNotReachHere(); |
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changeset
|
1834 |
} |
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changeset
|
1835 |
|
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changeset
|
1836 |
size_t words_remaining() { |
8871abcf70fa
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changeset
|
1837 |
size_t result = 0; |
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changeset
|
1838 |
for (int pr = 0; pr < _priority_max; ++pr) { |
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changeset
|
1839 |
result += _priority_buffer[pr]->words_remaining(); |
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changeset
|
1840 |
} |
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changeset
|
1841 |
return result; |
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changeset
|
1842 |
} |
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changeset
|
1843 |
|
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changeset
|
1844 |
size_t words_remaining_in_retired_buffer() { |
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changeset
|
1845 |
G1ParGCAllocBuffer* retired = _priority_buffer[0]; |
8871abcf70fa
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changeset
|
1846 |
return retired->words_remaining(); |
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6976350: G1: deal with fragmentation while copying objects during GC
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changeset
|
1847 |
} |
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changeset
|
1848 |
|
8871abcf70fa
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changeset
|
1849 |
void flush_stats_and_retire(PLABStats* stats, bool end_of_gc, bool retain) { |
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changeset
|
1850 |
for (int pr = 0; pr < _priority_max; ++pr) { |
8871abcf70fa
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changeset
|
1851 |
_priority_buffer[pr]->flush_stats_and_retire(stats, end_of_gc, retain); |
8871abcf70fa
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changeset
|
1852 |
} |
8871abcf70fa
6976350: G1: deal with fragmentation while copying objects during GC
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changeset
|
1853 |
} |
8871abcf70fa
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diff
changeset
|
1854 |
|
8871abcf70fa
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changeset
|
1855 |
void update(bool end_of_gc, bool retain, HeapWord* buf, size_t word_sz) { |
8871abcf70fa
6976350: G1: deal with fragmentation while copying objects during GC
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changeset
|
1856 |
G1ParGCAllocBuffer* retired_and_set = _priority_buffer[0]; |
8871abcf70fa
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changeset
|
1857 |
retired_and_set->retire(end_of_gc, retain); |
8871abcf70fa
6976350: G1: deal with fragmentation while copying objects during GC
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diff
changeset
|
1858 |
retired_and_set->set_buf(buf); |
8871abcf70fa
6976350: G1: deal with fragmentation while copying objects during GC
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changeset
|
1859 |
retired_and_set->set_word_size(word_sz); |
8871abcf70fa
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diff
changeset
|
1860 |
adjust_priority_order(); |
8871abcf70fa
6976350: G1: deal with fragmentation while copying objects during GC
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parents:
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diff
changeset
|
1861 |
} |
8871abcf70fa
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diff
changeset
|
1862 |
|
8871abcf70fa
6976350: G1: deal with fragmentation while copying objects during GC
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parents:
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diff
changeset
|
1863 |
private: |
8871abcf70fa
6976350: G1: deal with fragmentation while copying objects during GC
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parents:
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diff
changeset
|
1864 |
void adjust_priority_order() { |
8871abcf70fa
6976350: G1: deal with fragmentation while copying objects during GC
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diff
changeset
|
1865 |
G1ParGCAllocBuffer* retired_and_set = _priority_buffer[0]; |
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diff
changeset
|
1866 |
|
8871abcf70fa
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diff
changeset
|
1867 |
int last = _priority_max - 1; |
8871abcf70fa
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tamao
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diff
changeset
|
1868 |
for (int pr = 0; pr < last; ++pr) { |
8871abcf70fa
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diff
changeset
|
1869 |
_priority_buffer[pr] = _priority_buffer[pr + 1]; |
8871abcf70fa
6976350: G1: deal with fragmentation while copying objects during GC
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diff
changeset
|
1870 |
} |
8871abcf70fa
6976350: G1: deal with fragmentation while copying objects during GC
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diff
changeset
|
1871 |
_priority_buffer[last] = retired_and_set; |
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changeset
|
1872 |
} |
3262
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parents:
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changeset
|
1873 |
}; |
30d1c247fc25
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parents:
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diff
changeset
|
1874 |
|
30d1c247fc25
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
1875 |
class G1ParScanThreadState : public StackObj { |
30d1c247fc25
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
3191
diff
changeset
|
1876 |
protected: |
30d1c247fc25
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parents:
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diff
changeset
|
1877 |
G1CollectedHeap* _g1h; |
30d1c247fc25
6700789: G1: Enable use of compressed oops with G1 heaps
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changeset
|
1878 |
RefToScanQueue* _refs; |
30d1c247fc25
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
1879 |
DirtyCardQueue _dcq; |
20309 | 1880 |
G1SATBCardTableModRefBS* _ct_bs; |
3262
30d1c247fc25
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1881 |
G1RemSet* _g1_rem; |
30d1c247fc25
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1882 |
|
17856
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diff
changeset
|
1883 |
G1ParGCAllocBufferContainer _surviving_alloc_buffer; |
8871abcf70fa
6976350: G1: deal with fragmentation while copying objects during GC
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changeset
|
1884 |
G1ParGCAllocBufferContainer _tenured_alloc_buffer; |
8871abcf70fa
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changeset
|
1885 |
G1ParGCAllocBufferContainer* _alloc_buffers[GCAllocPurposeCount]; |
5347
1de2255c6c2e
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
5078
diff
changeset
|
1886 |
ageTable _age_table; |
3262
30d1c247fc25
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
3191
diff
changeset
|
1887 |
|
30d1c247fc25
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
3191
diff
changeset
|
1888 |
size_t _alloc_buffer_waste; |
30d1c247fc25
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
3191
diff
changeset
|
1889 |
size_t _undo_waste; |
30d1c247fc25
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
3191
diff
changeset
|
1890 |
|
30d1c247fc25
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
3191
diff
changeset
|
1891 |
OopsInHeapRegionClosure* _evac_failure_cl; |
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1892 |
G1ParScanHeapEvacClosure* _evac_cl; |
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1893 |
G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1894 |
|
18025 | 1895 |
int _hash_seed; |
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1896 |
uint _queue_num; |
3262
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1897 |
|
5891 | 1898 |
size_t _term_attempts; |
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1899 |
|
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1900 |
double _start; |
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|
1901 |
double _start_strong_roots; |
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1902 |
double _strong_roots_time; |
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1903 |
double _start_term; |
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1904 |
double _term_time; |
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1905 |
|
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1906 |
// Map from young-age-index (0 == not young, 1 is youngest) to |
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1907 |
// surviving words. base is what we get back from the malloc call |
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1908 |
size_t* _surviving_young_words_base; |
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1909 |
// this points into the array, as we use the first few entries for padding |
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|
1910 |
size_t* _surviving_young_words; |
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1911 |
|
6251 | 1912 |
#define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
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1913 |
|
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1914 |
void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1915 |
|
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|
1916 |
void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1917 |
|
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1918 |
DirtyCardQueue& dirty_card_queue() { return _dcq; } |
20309 | 1919 |
G1SATBCardTableModRefBS* ctbs() { return _ct_bs; } |
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1920 |
|
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1921 |
template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1922 |
if (!from->is_survivor()) { |
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|
1923 |
_g1_rem->par_write_ref(from, p, tid); |
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|
1924 |
} |
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|
1925 |
} |
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|
1926 |
|
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|
1927 |
template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1928 |
// If the new value of the field points to the same region or |
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|
1929 |
// is the to-space, we don't need to include it in the Rset updates. |
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|
1930 |
if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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|
1931 |
size_t card_index = ctbs()->index_for(p); |
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|
1932 |
// If the card hasn't been added to the buffer, do it. |
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|
1933 |
if (ctbs()->mark_card_deferred(card_index)) { |
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|
1934 |
dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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|
1935 |
} |
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|
1936 |
} |
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|
1937 |
} |
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|
1938 |
|
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|
1939 |
public: |
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1940 |
G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num); |
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|
1941 |
|
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|
1942 |
~G1ParScanThreadState() { |
13195 | 1943 |
FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base, mtGC); |
3262
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1944 |
} |
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|
1945 |
|
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|
1946 |
RefToScanQueue* refs() { return _refs; } |
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|
1947 |
ageTable* age_table() { return &_age_table; } |
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|
1948 |
|
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|
1949 |
G1ParGCAllocBufferContainer* alloc_buffer(GCAllocPurpose purpose) { |
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|
1950 |
return _alloc_buffers[purpose]; |
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|
1951 |
} |
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|
1952 |
|
6251 | 1953 |
size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1954 |
size_t undo_waste() const { return _undo_waste; } |
|
3262
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|
1955 |
|
6959
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|
1956 |
#ifdef ASSERT |
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|
1957 |
bool verify_ref(narrowOop* ref) const; |
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|
1958 |
bool verify_ref(oop* ref) const; |
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|
1959 |
bool verify_task(StarTask ref) const; |
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|
1960 |
#endif // ASSERT |
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|
1961 |
|
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|
1962 |
template <class T> void push_on_queue(T* ref) { |
6959
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|
1963 |
assert(verify_ref(ref), "sanity"); |
6251 | 1964 |
refs()->push(ref); |
3262
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|
1965 |
} |
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|
1966 |
|
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|
1967 |
template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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|
1968 |
if (G1DeferredRSUpdate) { |
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|
1969 |
deferred_rs_update(from, p, tid); |
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|
1970 |
} else { |
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|
1971 |
immediate_rs_update(from, p, tid); |
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|
1972 |
} |
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|
1973 |
} |
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|
1974 |
|
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|
1975 |
HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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|
1976 |
HeapWord* obj = NULL; |
5347
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|
1977 |
size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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changeset
|
1978 |
if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
17856
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|
1979 |
G1ParGCAllocBufferContainer* alloc_buf = alloc_buffer(purpose); |
3262
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|
1980 |
|
5347
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parents:
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changeset
|
1981 |
HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
3262
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|
1982 |
if (buf == NULL) return NULL; // Let caller handle allocation failure. |
17856
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changeset
|
1983 |
|
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changeset
|
1984 |
add_to_alloc_buffer_waste(alloc_buf->words_remaining_in_retired_buffer()); |
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|
1985 |
alloc_buf->update(false /* end_of_gc */, false /* retain */, buf, gclab_word_size); |
3262
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|
1986 |
|
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|
1987 |
obj = alloc_buf->allocate(word_sz); |
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|
1988 |
assert(obj != NULL, "buffer was definitely big enough..."); |
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|
1989 |
} else { |
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|
1990 |
obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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|
1991 |
} |
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|
1992 |
return obj; |
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|
1993 |
} |
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|
1994 |
|
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|
1995 |
HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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|
1996 |
HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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|
1997 |
if (obj != NULL) return obj; |
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|
1998 |
return allocate_slow(purpose, word_sz); |
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|
1999 |
} |
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|
2000 |
|
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|
2001 |
void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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|
2002 |
if (alloc_buffer(purpose)->contains(obj)) { |
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|
2003 |
assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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|
2004 |
"should contain whole object"); |
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|
2005 |
alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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|
2006 |
} else { |
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changeset
|
2007 |
CollectedHeap::fill_with_object(obj, word_sz); |
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changeset
|
2008 |
add_to_undo_waste(word_sz); |
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changeset
|
2009 |
} |
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changeset
|
2010 |
} |
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changeset
|
2011 |
|
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changeset
|
2012 |
void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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|
2013 |
_evac_failure_cl = evac_failure_cl; |
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2014 |
} |
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|
2015 |
OopsInHeapRegionClosure* evac_failure_closure() { |
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|
2016 |
return _evac_failure_cl; |
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|
2017 |
} |
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|
2018 |
|
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|
2019 |
void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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|
2020 |
_evac_cl = evac_cl; |
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|
2021 |
} |
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|
2022 |
|
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|
2023 |
void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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|
2024 |
_partial_scan_cl = partial_scan_cl; |
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|
2025 |
} |
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|
2026 |
|
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|
2027 |
int* hash_seed() { return &_hash_seed; } |
11583
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6484965: G1: piggy-back liveness accounting phase on marking
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|
2028 |
uint queue_num() { return _queue_num; } |
3262
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2029 |
|
6251 | 2030 |
size_t term_attempts() const { return _term_attempts; } |
5891 | 2031 |
void note_term_attempt() { _term_attempts++; } |
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|
2032 |
|
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|
2033 |
void start_strong_roots() { |
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|
2034 |
_start_strong_roots = os::elapsedTime(); |
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|
2035 |
} |
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|
2036 |
void end_strong_roots() { |
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2037 |
_strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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2038 |
} |
6251 | 2039 |
double strong_roots_time() const { return _strong_roots_time; } |
3262
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|
2040 |
|
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|
2041 |
void start_term_time() { |
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|
2042 |
note_term_attempt(); |
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|
2043 |
_start_term = os::elapsedTime(); |
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|
2044 |
} |
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2045 |
void end_term_time() { |
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2046 |
_term_time += (os::elapsedTime() - _start_term); |
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2047 |
} |
6251 | 2048 |
double term_time() const { return _term_time; } |
3262
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2049 |
|
6251 | 2050 |
double elapsed_time() const { |
3262
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|
2051 |
return os::elapsedTime() - _start; |
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|
2052 |
} |
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|
2053 |
|
6251 | 2054 |
static void |
2055 |
print_termination_stats_hdr(outputStream* const st = gclog_or_tty); |
|
2056 |
void |
|
2057 |
print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; |
|
2058 |
||
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2059 |
size_t* surviving_young_words() { |
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|
2060 |
// We add on to hide entry 0 which accumulates surviving words for |
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2061 |
// age -1 regions (i.e. non-young ones) |
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|
2062 |
return _surviving_young_words; |
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|
2063 |
} |
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|
2064 |
|
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|
2065 |
void retire_alloc_buffers() { |
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|
2066 |
for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
5347
1de2255c6c2e
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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|
2067 |
size_t waste = _alloc_buffers[ap]->words_remaining(); |
3262
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|
2068 |
add_to_alloc_buffer_waste(waste); |
13466 | 2069 |
_alloc_buffers[ap]->flush_stats_and_retire(_g1h->stats_for_purpose((GCAllocPurpose)ap), |
2070 |
true /* end_of_gc */, |
|
2071 |
false /* retain */); |
|
3262
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|
2072 |
} |
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|
2073 |
} |
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|
2074 |
|
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|
2075 |
template <class T> void deal_with_reference(T* ref_to_scan) { |
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|
2076 |
if (has_partial_array_mask(ref_to_scan)) { |
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|
2077 |
_partial_scan_cl->do_oop_nv(ref_to_scan); |
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|
2078 |
} else { |
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|
2079 |
// Note: we can use "raw" versions of "region_containing" because |
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|
2080 |
// "obj_to_scan" is definitely in the heap, and is not in a |
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|
2081 |
// humongous region. |
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|
2082 |
HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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|
2083 |
_evac_cl->set_region(r); |
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|
2084 |
_evac_cl->do_oop_nv(ref_to_scan); |
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|
2085 |
} |
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|
2086 |
} |
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|
2087 |
|
6959
01bebea2fd5c
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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changeset
|
2088 |
void deal_with_reference(StarTask ref) { |
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|
2089 |
assert(verify_task(ref), "sanity"); |
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|
2090 |
if (ref.is_narrow()) { |
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|
2091 |
deal_with_reference((narrowOop*)ref); |
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|
2092 |
} else { |
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|
2093 |
deal_with_reference((oop*)ref); |
3262
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|
2094 |
} |
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|
2095 |
} |
6959
01bebea2fd5c
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jcoomes
parents:
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changeset
|
2096 |
|
01bebea2fd5c
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parents:
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|
2097 |
void trim_queue(); |
3262
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|
2098 |
}; |
7397 | 2099 |
|
2100 |
#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |