author | coleenp |
Thu, 25 Apr 2019 10:56:31 -0400 | |
changeset 54623 | 1126f0607c70 |
parent 54385 | 9559ba212c18 |
child 54669 | ad45b3802d4e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "aot/aotLoader.hpp" |
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#include "classfile/classLoaderDataGraph.hpp" |
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#include "classfile/symbolTable.hpp" |
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#include "classfile/stringTable.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "classfile/vmSymbols.hpp" |
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#include "code/codeCache.hpp" |
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#include "code/icBuffer.hpp" |
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#include "gc/serial/defNewGeneration.hpp" |
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#include "gc/shared/adaptiveSizePolicy.hpp" |
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#include "gc/shared/cardTableBarrierSet.hpp" |
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#include "gc/shared/cardTableRS.hpp" |
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#include "gc/shared/collectedHeap.inline.hpp" |
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#include "gc/shared/collectorCounters.hpp" |
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#include "gc/shared/gcId.hpp" |
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#include "gc/shared/gcLocker.hpp" |
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#include "gc/shared/gcPolicyCounters.hpp" |
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#include "gc/shared/gcTrace.hpp" |
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#include "gc/shared/gcTraceTime.inline.hpp" |
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#include "gc/shared/gcVMOperations.hpp" |
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#include "gc/shared/genCollectedHeap.hpp" |
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#include "gc/shared/genOopClosures.inline.hpp" |
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#include "gc/shared/generationSpec.hpp" |
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#include "gc/shared/oopStorageParState.inline.hpp" |
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#include "gc/shared/scavengableNMethods.hpp" |
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#include "gc/shared/space.hpp" |
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#include "gc/shared/strongRootsScope.hpp" |
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#include "gc/shared/weakProcessor.hpp" |
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#include "gc/shared/workgroup.hpp" |
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#include "memory/filemap.hpp" |
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#include "memory/metaspaceCounters.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/biasedLocking.hpp" |
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#include "runtime/flags/flagSetting.hpp" |
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#include "runtime/handles.hpp" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/java.hpp" |
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#include "runtime/vmThread.hpp" |
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#include "services/management.hpp" |
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#include "services/memoryService.hpp" |
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#include "utilities/debug.hpp" |
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#include "utilities/formatBuffer.hpp" |
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#include "utilities/macros.hpp" |
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#include "utilities/stack.inline.hpp" |
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#include "utilities/vmError.hpp" |
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GenCollectedHeap::GenCollectedHeap(GenCollectorPolicy *policy, |
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Generation::Name young, |
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Generation::Name old, |
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const char* policy_counters_name) : |
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CollectedHeap(), |
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_young_gen_spec(new GenerationSpec(young, |
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policy->initial_young_size(), |
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policy->max_young_size(), |
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policy->gen_alignment())), |
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_old_gen_spec(new GenerationSpec(old, |
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policy->initial_old_size(), |
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policy->max_old_size(), |
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policy->gen_alignment())), |
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_rem_set(NULL), |
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_gen_policy(policy), |
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_soft_ref_gen_policy(), |
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_gc_policy_counters(new GCPolicyCounters(policy_counters_name, 2, 2)), |
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_full_collections_completed(0), |
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_process_strong_tasks(new SubTasksDone(GCH_PS_NumElements)) { |
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} |
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jint GenCollectedHeap::initialize() { |
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// While there are no constraints in the GC code that HeapWordSize |
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// be any particular value, there are multiple other areas in the |
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// system which believe this to be true (e.g. oop->object_size in some |
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// cases incorrectly returns the size in wordSize units rather than |
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// HeapWordSize). |
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guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); |
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// Allocate space for the heap. |
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char* heap_address; |
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ReservedSpace heap_rs; |
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size_t heap_alignment = collector_policy()->heap_alignment(); |
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heap_address = allocate(heap_alignment, &heap_rs); |
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if (!heap_rs.is_reserved()) { |
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vm_shutdown_during_initialization( |
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"Could not reserve enough space for object heap"); |
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return JNI_ENOMEM; |
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} |
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initialize_reserved_region((HeapWord*)heap_rs.base(), (HeapWord*)(heap_rs.base() + heap_rs.size())); |
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_rem_set = create_rem_set(reserved_region()); |
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_rem_set->initialize(); |
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CardTableBarrierSet *bs = new CardTableBarrierSet(_rem_set); |
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bs->initialize(); |
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BarrierSet::set_barrier_set(bs); |
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ReservedSpace young_rs = heap_rs.first_part(_young_gen_spec->max_size(), false, false); |
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_young_gen = _young_gen_spec->init(young_rs, rem_set()); |
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heap_rs = heap_rs.last_part(_young_gen_spec->max_size()); |
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ReservedSpace old_rs = heap_rs.first_part(_old_gen_spec->max_size(), false, false); |
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_old_gen = _old_gen_spec->init(old_rs, rem_set()); |
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clear_incremental_collection_failed(); |
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return JNI_OK; |
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} |
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CardTableRS* GenCollectedHeap::create_rem_set(const MemRegion& reserved_region) { |
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return new CardTableRS(reserved_region, false /* scan_concurrently */); |
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} |
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void GenCollectedHeap::initialize_size_policy(size_t init_eden_size, |
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size_t init_promo_size, |
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size_t init_survivor_size) { |
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const double max_gc_pause_sec = ((double) MaxGCPauseMillis) / 1000.0; |
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_size_policy = new AdaptiveSizePolicy(init_eden_size, |
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init_promo_size, |
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init_survivor_size, |
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max_gc_pause_sec, |
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GCTimeRatio); |
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} |
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char* GenCollectedHeap::allocate(size_t alignment, |
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ReservedSpace* heap_rs){ |
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// Now figure out the total size. |
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const size_t pageSize = UseLargePages ? os::large_page_size() : os::vm_page_size(); |
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assert(alignment % pageSize == 0, "Must be"); |
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// Check for overflow. |
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size_t total_reserved = _young_gen_spec->max_size() + _old_gen_spec->max_size(); |
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if (total_reserved < _young_gen_spec->max_size()) { |
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vm_exit_during_initialization("The size of the object heap + VM data exceeds " |
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"the maximum representable size"); |
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} |
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assert(total_reserved % alignment == 0, |
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"Gen size; total_reserved=" SIZE_FORMAT ", alignment=" |
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SIZE_FORMAT, total_reserved, alignment); |
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*heap_rs = Universe::reserve_heap(total_reserved, alignment); |
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os::trace_page_sizes("Heap", |
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collector_policy()->min_heap_byte_size(), |
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171 |
total_reserved, |
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alignment, |
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heap_rs->base(), |
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heap_rs->size()); |
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return heap_rs->base(); |
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} |
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class GenIsScavengable : public BoolObjectClosure { |
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public: |
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bool do_object_b(oop obj) { |
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return GenCollectedHeap::heap()->is_in_young(obj); |
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} |
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}; |
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|
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static GenIsScavengable _is_scavengable; |
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|
1 | 188 |
void GenCollectedHeap::post_initialize() { |
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CollectedHeap::post_initialize(); |
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ref_processing_init(); |
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DefNewGeneration* def_new_gen = (DefNewGeneration*)_young_gen; |
1 | 193 |
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initialize_size_policy(def_new_gen->eden()->capacity(), |
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_old_gen->capacity(), |
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def_new_gen->from()->capacity()); |
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|
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MarkSweep::initialize(); |
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|
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ScavengableNMethods::initialize(&_is_scavengable); |
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} |
202 |
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void GenCollectedHeap::ref_processing_init() { |
|
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_young_gen->ref_processor_init(); |
205 |
_old_gen->ref_processor_init(); |
|
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} |
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GenerationSpec* GenCollectedHeap::young_gen_spec() const { |
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return _young_gen_spec; |
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} |
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211 |
|
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GenerationSpec* GenCollectedHeap::old_gen_spec() const { |
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return _old_gen_spec; |
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} |
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215 |
|
1 | 216 |
size_t GenCollectedHeap::capacity() const { |
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return _young_gen->capacity() + _old_gen->capacity(); |
1 | 218 |
} |
219 |
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size_t GenCollectedHeap::used() const { |
|
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return _young_gen->used() + _old_gen->used(); |
1 | 222 |
} |
223 |
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void GenCollectedHeap::save_used_regions() { |
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_old_gen->save_used_region(); |
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_young_gen->save_used_region(); |
1 | 227 |
} |
228 |
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229 |
size_t GenCollectedHeap::max_capacity() const { |
|
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return _young_gen->max_capacity() + _old_gen->max_capacity(); |
1 | 231 |
} |
232 |
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// Update the _full_collections_completed counter |
|
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// at the end of a stop-world full GC. |
|
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unsigned int GenCollectedHeap::update_full_collections_completed() { |
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MonitorLocker ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
1 | 237 |
assert(_full_collections_completed <= _total_full_collections, |
238 |
"Can't complete more collections than were started"); |
|
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_full_collections_completed = _total_full_collections; |
|
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ml.notify_all(); |
|
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return _full_collections_completed; |
|
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} |
|
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// Update the _full_collections_completed counter, as appropriate, |
|
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// at the end of a concurrent GC cycle. Note the conditional update |
|
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// below to allow this method to be called by a concurrent collector |
|
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// without synchronizing in any manner with the VM thread (which |
|
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// may already have initiated a STW full collection "concurrently"). |
|
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unsigned int GenCollectedHeap::update_full_collections_completed(unsigned int count) { |
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MonitorLocker ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
1 | 251 |
assert((_full_collections_completed <= _total_full_collections) && |
252 |
(count <= _total_full_collections), |
|
253 |
"Can't complete more collections than were started"); |
|
254 |
if (count > _full_collections_completed) { |
|
255 |
_full_collections_completed = count; |
|
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ml.notify_all(); |
|
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} |
|
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return _full_collections_completed; |
|
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} |
|
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||
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// Return true if any of the following is true: |
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// . the allocation won't fit into the current young gen heap |
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// . gc locker is occupied (jni critical section) |
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// . heap memory is tight -- the most recent previous collection |
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// was a full collection because a partial collection (would |
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// have) failed and is likely to fail again |
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bool GenCollectedHeap::should_try_older_generation_allocation(size_t word_size) const { |
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size_t young_capacity = _young_gen->capacity_before_gc(); |
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return (word_size > heap_word_size(young_capacity)) |
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|| GCLocker::is_active_and_needs_gc() |
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|| incremental_collection_failed(); |
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} |
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|
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HeapWord* GenCollectedHeap::expand_heap_and_allocate(size_t size, bool is_tlab) { |
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HeapWord* result = NULL; |
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if (_old_gen->should_allocate(size, is_tlab)) { |
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result = _old_gen->expand_and_allocate(size, is_tlab); |
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} |
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if (result == NULL) { |
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if (_young_gen->should_allocate(size, is_tlab)) { |
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result = _young_gen->expand_and_allocate(size, is_tlab); |
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} |
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} |
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assert(result == NULL || is_in_reserved(result), "result not in heap"); |
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return result; |
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286 |
} |
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287 |
|
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HeapWord* GenCollectedHeap::mem_allocate_work(size_t size, |
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bool is_tlab, |
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bool* gc_overhead_limit_was_exceeded) { |
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// In general gc_overhead_limit_was_exceeded should be false so |
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// set it so here and reset it to true only if the gc time |
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// limit is being exceeded as checked below. |
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*gc_overhead_limit_was_exceeded = false; |
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|
295 |
|
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|
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HeapWord* result = NULL; |
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|
297 |
|
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|
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// Loop until the allocation is satisfied, or unsatisfied after GC. |
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|
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for (uint try_count = 1, gclocker_stalled_count = 0; /* return or throw */; try_count += 1) { |
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|
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HandleMark hm; // Discard any handles allocated in each iteration. |
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|
301 |
|
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// First allocation attempt is lock-free. |
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Generation *young = _young_gen; |
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|
304 |
assert(young->supports_inline_contig_alloc(), |
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|
305 |
"Otherwise, must do alloc within heap lock"); |
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|
306 |
if (young->should_allocate(size, is_tlab)) { |
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|
307 |
result = young->par_allocate(size, is_tlab); |
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|
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if (result != NULL) { |
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|
309 |
assert(is_in_reserved(result), "result not in heap"); |
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|
310 |
return result; |
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|
311 |
} |
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|
312 |
} |
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|
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uint gc_count_before; // Read inside the Heap_lock locked region. |
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{ |
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|
315 |
MutexLocker ml(Heap_lock); |
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|
316 |
log_trace(gc, alloc)("GenCollectedHeap::mem_allocate_work: attempting locked slow path allocation"); |
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|
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// Note that only large objects get a shot at being |
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|
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// allocated in later generations. |
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|
319 |
bool first_only = !should_try_older_generation_allocation(size); |
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|
320 |
|
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|
321 |
result = attempt_allocation(size, is_tlab, first_only); |
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|
322 |
if (result != NULL) { |
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|
323 |
assert(is_in_reserved(result), "result not in heap"); |
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|
324 |
return result; |
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|
325 |
} |
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|
326 |
|
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|
327 |
if (GCLocker::is_active_and_needs_gc()) { |
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|
328 |
if (is_tlab) { |
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|
329 |
return NULL; // Caller will retry allocating individual object. |
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|
330 |
} |
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|
331 |
if (!is_maximal_no_gc()) { |
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|
332 |
// Try and expand heap to satisfy request. |
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|
333 |
result = expand_heap_and_allocate(size, is_tlab); |
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|
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// Result could be null if we are out of space. |
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|
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if (result != NULL) { |
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return result; |
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|
337 |
} |
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|
338 |
} |
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|
339 |
|
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|
340 |
if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
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|
341 |
return NULL; // We didn't get to do a GC and we didn't get any memory. |
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|
342 |
} |
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|
343 |
|
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changeset
|
344 |
// If this thread is not in a jni critical section, we stall |
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changeset
|
345 |
// the requestor until the critical section has cleared and |
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diff
changeset
|
346 |
// GC allowed. When the critical section clears, a GC is |
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diff
changeset
|
347 |
// initiated by the last thread exiting the critical section; so |
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changeset
|
348 |
// we retry the allocation sequence from the beginning of the loop, |
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diff
changeset
|
349 |
// rather than causing more, now probably unnecessary, GC attempts. |
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changeset
|
350 |
JavaThread* jthr = JavaThread::current(); |
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changeset
|
351 |
if (!jthr->in_critical()) { |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
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diff
changeset
|
352 |
MutexUnlocker mul(Heap_lock); |
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diff
changeset
|
353 |
// Wait for JNI critical section to be exited |
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diff
changeset
|
354 |
GCLocker::stall_until_clear(); |
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|
355 |
gclocker_stalled_count += 1; |
c8e4dc1b9e39
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changeset
|
356 |
continue; |
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diff
changeset
|
357 |
} else { |
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diff
changeset
|
358 |
if (CheckJNICalls) { |
c8e4dc1b9e39
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diff
changeset
|
359 |
fatal("Possible deadlock due to allocating while" |
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changeset
|
360 |
" in jni critical section"); |
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diff
changeset
|
361 |
} |
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diff
changeset
|
362 |
return NULL; |
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diff
changeset
|
363 |
} |
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diff
changeset
|
364 |
} |
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diff
changeset
|
365 |
|
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diff
changeset
|
366 |
// Read the gc count while the heap lock is held. |
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|
367 |
gc_count_before = total_collections(); |
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changeset
|
368 |
} |
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diff
changeset
|
369 |
|
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diff
changeset
|
370 |
VM_GenCollectForAllocation op(size, is_tlab, gc_count_before); |
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changeset
|
371 |
VMThread::execute(&op); |
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changeset
|
372 |
if (op.prologue_succeeded()) { |
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|
373 |
result = op.result(); |
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changeset
|
374 |
if (op.gc_locked()) { |
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diff
changeset
|
375 |
assert(result == NULL, "must be NULL if gc_locked() is true"); |
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changeset
|
376 |
continue; // Retry and/or stall as necessary. |
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diff
changeset
|
377 |
} |
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diff
changeset
|
378 |
|
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changeset
|
379 |
// Allocation has failed and a collection |
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changeset
|
380 |
// has been done. If the gc time limit was exceeded the |
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changeset
|
381 |
// this time, return NULL so that an out-of-memory |
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changeset
|
382 |
// will be thrown. Clear gc_overhead_limit_exceeded |
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changeset
|
383 |
// so that the overhead exceeded does not persist. |
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changeset
|
384 |
|
49048
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diff
changeset
|
385 |
const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
49047
8f004146e407
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diff
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|
386 |
const bool softrefs_clear = soft_ref_policy()->all_soft_refs_clear(); |
49046
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|
387 |
|
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|
388 |
if (limit_exceeded && softrefs_clear) { |
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|
389 |
*gc_overhead_limit_was_exceeded = true; |
49048
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8198525: Move _size_policy out of GenCollectorPolicy into GenCollectedHeap
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changeset
|
390 |
size_policy()->set_gc_overhead_limit_exceeded(false); |
49046
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|
391 |
if (op.result() != NULL) { |
c8e4dc1b9e39
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changeset
|
392 |
CollectedHeap::fill_with_object(op.result(), size); |
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changeset
|
393 |
} |
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changeset
|
394 |
return NULL; |
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diff
changeset
|
395 |
} |
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changeset
|
396 |
assert(result == NULL || is_in_reserved(result), |
c8e4dc1b9e39
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changeset
|
397 |
"result not in heap"); |
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changeset
|
398 |
return result; |
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diff
changeset
|
399 |
} |
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diff
changeset
|
400 |
|
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parents:
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diff
changeset
|
401 |
// Give a warning if we seem to be looping forever. |
c8e4dc1b9e39
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diff
changeset
|
402 |
if ((QueuedAllocationWarningCount > 0) && |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
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changeset
|
403 |
(try_count % QueuedAllocationWarningCount == 0)) { |
c8e4dc1b9e39
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changeset
|
404 |
log_warning(gc, ergo)("GenCollectedHeap::mem_allocate_work retries %d times," |
c8e4dc1b9e39
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changeset
|
405 |
" size=" SIZE_FORMAT " %s", try_count, size, is_tlab ? "(TLAB)" : ""); |
c8e4dc1b9e39
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changeset
|
406 |
} |
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8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
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diff
changeset
|
407 |
} |
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diff
changeset
|
408 |
} |
1 | 409 |
|
410 |
#ifndef PRODUCT |
|
411 |
// Override of memory state checking method in CollectedHeap: |
|
412 |
// Some collectors (CMS for example) can't have badHeapWordVal written |
|
413 |
// in the first two words of an object. (For instance , in the case of |
|
414 |
// CMS these words hold state used to synchronize between certain |
|
415 |
// (concurrent) GC steps and direct allocating mutators.) |
|
416 |
// The skip_header_HeapWords() method below, allows us to skip |
|
417 |
// over the requisite number of HeapWord's. Note that (for |
|
418 |
// generational collectors) this means that those many words are |
|
419 |
// skipped in each object, irrespective of the generation in which |
|
420 |
// that object lives. The resultant loss of precision seems to be |
|
421 |
// harmless and the pain of avoiding that imprecision appears somewhat |
|
422 |
// higher than we are prepared to pay for such rudimentary debugging |
|
423 |
// support. |
|
424 |
void GenCollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, |
|
425 |
size_t size) { |
|
426 |
if (CheckMemoryInitialization && ZapUnusedHeapArea) { |
|
427 |
// We are asked to check a size in HeapWords, |
|
428 |
// but the memory is mangled in juint words. |
|
429 |
juint* start = (juint*) (addr + skip_header_HeapWords()); |
|
430 |
juint* end = (juint*) (addr + size); |
|
431 |
for (juint* slot = start; slot < end; slot += 1) { |
|
432 |
assert(*slot == badHeapWordVal, |
|
433 |
"Found non badHeapWordValue in pre-allocation check"); |
|
434 |
} |
|
435 |
} |
|
436 |
} |
|
437 |
#endif |
|
438 |
||
439 |
HeapWord* GenCollectedHeap::attempt_allocation(size_t size, |
|
440 |
bool is_tlab, |
|
441 |
bool first_only) { |
|
29200 | 442 |
HeapWord* res = NULL; |
443 |
||
444 |
if (_young_gen->should_allocate(size, is_tlab)) { |
|
445 |
res = _young_gen->allocate(size, is_tlab); |
|
446 |
if (res != NULL || first_only) { |
|
447 |
return res; |
|
1 | 448 |
} |
449 |
} |
|
29200 | 450 |
|
451 |
if (_old_gen->should_allocate(size, is_tlab)) { |
|
452 |
res = _old_gen->allocate(size, is_tlab); |
|
453 |
} |
|
454 |
||
455 |
return res; |
|
1 | 456 |
} |
457 |
||
458 |
HeapWord* GenCollectedHeap::mem_allocate(size_t size, |
|
459 |
bool* gc_overhead_limit_was_exceeded) { |
|
49046
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|
460 |
return mem_allocate_work(size, |
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8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
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changeset
|
461 |
false /* is_tlab */, |
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diff
changeset
|
462 |
gc_overhead_limit_was_exceeded); |
1 | 463 |
} |
464 |
||
465 |
bool GenCollectedHeap::must_clear_all_soft_refs() { |
|
37149
f025738bbada
8152113: Remove _last_ditch_collection GC-cause and avoid expanding heap on Metaspace OOM
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parents:
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diff
changeset
|
466 |
return _gc_cause == GCCause::_metadata_GC_clear_soft_refs || |
f025738bbada
8152113: Remove _last_ditch_collection GC-cause and avoid expanding heap on Metaspace OOM
sjohanss
parents:
37146
diff
changeset
|
467 |
_gc_cause == GCCause::_wb_full_gc; |
1 | 468 |
} |
469 |
||
29200 | 470 |
void GenCollectedHeap::collect_generation(Generation* gen, bool full, size_t size, |
471 |
bool is_tlab, bool run_verification, bool clear_soft_refs, |
|
472 |
bool restore_marks_for_biased_locking) { |
|
35061 | 473 |
FormatBuffer<> title("Collect gen: %s", gen->short_name()); |
37146 | 474 |
GCTraceTime(Trace, gc, phases) t1(title); |
29200 | 475 |
TraceCollectorStats tcs(gen->counters()); |
48168
cb5d2d4453d0
8191564: Refactor GC related servicability code into GC specific subclasses
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parents:
47819
diff
changeset
|
476 |
TraceMemoryManagerStats tmms(gen->gc_manager(), gc_cause()); |
29200 | 477 |
|
478 |
gen->stat_record()->invocations++; |
|
479 |
gen->stat_record()->accumulated_time.start(); |
|
480 |
||
481 |
// Must be done anew before each collection because |
|
482 |
// a previous collection will do mangling and will |
|
483 |
// change top of some spaces. |
|
484 |
record_gen_tops_before_GC(); |
|
485 |
||
35061 | 486 |
log_trace(gc)("%s invoke=%d size=" SIZE_FORMAT, heap()->is_young_gen(gen) ? "Young" : "Old", gen->stat_record()->invocations, size * HeapWordSize); |
29200 | 487 |
|
488 |
if (run_verification && VerifyBeforeGC) { |
|
489 |
HandleMark hm; // Discard invalid handles created during verification |
|
35061 | 490 |
Universe::verify("Before GC"); |
29200 | 491 |
} |
492 |
COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
493 |
||
494 |
if (restore_marks_for_biased_locking) { |
|
495 |
// We perform this mark word preservation work lazily |
|
496 |
// because it's only at this point that we know whether we |
|
497 |
// absolutely have to do it; we want to avoid doing it for |
|
498 |
// scavenge-only collections where it's unnecessary |
|
499 |
BiasedLocking::preserve_marks(); |
|
500 |
} |
|
501 |
||
502 |
// Do collection work |
|
503 |
{ |
|
504 |
// Note on ref discovery: For what appear to be historical reasons, |
|
505 |
// GCH enables and disabled (by enqueing) refs discovery. |
|
506 |
// In the future this should be moved into the generation's |
|
507 |
// collect method so that ref discovery and enqueueing concerns |
|
508 |
// are local to a generation. The collect method could return |
|
509 |
// an appropriate indication in the case that notification on |
|
510 |
// the ref lock was needed. This will make the treatment of |
|
511 |
// weak refs more uniform (and indeed remove such concerns |
|
512 |
// from GCH). XXX |
|
513 |
||
514 |
HandleMark hm; // Discard invalid handles created during gc |
|
515 |
save_marks(); // save marks for all gens |
|
516 |
// We want to discover references, but not process them yet. |
|
517 |
// This mode is disabled in process_discovered_references if the |
|
518 |
// generation does some collection work, or in |
|
519 |
// enqueue_discovered_references if the generation returns |
|
520 |
// without doing any work. |
|
521 |
ReferenceProcessor* rp = gen->ref_processor(); |
|
522 |
// If the discovery of ("weak") refs in this generation is |
|
523 |
// atomic wrt other collectors in this configuration, we |
|
524 |
// are guaranteed to have empty discovered ref lists. |
|
525 |
if (rp->discovery_is_atomic()) { |
|
526 |
rp->enable_discovery(); |
|
527 |
rp->setup_policy(clear_soft_refs); |
|
528 |
} else { |
|
529 |
// collect() below will enable discovery as appropriate |
|
530 |
} |
|
531 |
gen->collect(full, clear_soft_refs, size, is_tlab); |
|
532 |
if (!rp->enqueuing_is_done()) { |
|
50049
9d17c375dc30
8202017: Merge Reference Enqueuing phase with phase 3 of Reference processing
tschatzl
parents:
50034
diff
changeset
|
533 |
rp->disable_discovery(); |
29200 | 534 |
} else { |
535 |
rp->set_enqueuing_is_done(false); |
|
536 |
} |
|
537 |
rp->verify_no_references_recorded(); |
|
538 |
} |
|
539 |
||
540 |
COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
|
541 |
||
542 |
gen->stat_record()->accumulated_time.stop(); |
|
543 |
||
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
544 |
update_gc_stats(gen, full); |
29200 | 545 |
|
546 |
if (run_verification && VerifyAfterGC) { |
|
547 |
HandleMark hm; // Discard invalid handles created during verification |
|
35061 | 548 |
Universe::verify("After GC"); |
29200 | 549 |
} |
550 |
} |
|
551 |
||
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
552 |
void GenCollectedHeap::do_collection(bool full, |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
553 |
bool clear_all_soft_refs, |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
554 |
size_t size, |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
555 |
bool is_tlab, |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
556 |
GenerationType max_generation) { |
1 | 557 |
ResourceMark rm; |
558 |
DEBUG_ONLY(Thread* my_thread = Thread::current();) |
|
559 |
||
560 |
assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
|
561 |
assert(my_thread->is_VM_thread() || |
|
562 |
my_thread->is_ConcurrentGC_thread(), |
|
563 |
"incorrect thread type capability"); |
|
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4641
diff
changeset
|
564 |
assert(Heap_lock->is_locked(), |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4641
diff
changeset
|
565 |
"the requesting thread should have the Heap_lock"); |
1 | 566 |
guarantee(!is_gc_active(), "collection is not reentrant"); |
567 |
||
35492
c8c0273e6b91
8146690: Make all classes in GC follow the naming convention.
david
parents:
35061
diff
changeset
|
568 |
if (GCLocker::check_active_before_gc()) { |
1 | 569 |
return; // GC is disabled (e.g. JNI GetXXXCritical operation) |
570 |
} |
|
571 |
||
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4641
diff
changeset
|
572 |
const bool do_clear_all_soft_refs = clear_all_soft_refs || |
49047
8f004146e407
8198515: Extract SoftReferencePolicy code out of CollectorPolicy
stefank
parents:
49046
diff
changeset
|
573 |
soft_ref_policy()->should_clear_all_soft_refs(); |
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4641
diff
changeset
|
574 |
|
49047
8f004146e407
8198515: Extract SoftReferencePolicy code out of CollectorPolicy
stefank
parents:
49046
diff
changeset
|
575 |
ClearedAllSoftRefs casr(do_clear_all_soft_refs, soft_ref_policy()); |
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4641
diff
changeset
|
576 |
|
49389
9ef2eee8ca7c
8199430: Rename MetaspaceAux to something more meaningful
stuefe
parents:
49164
diff
changeset
|
577 |
const size_t metadata_prev_used = MetaspaceUtils::used_bytes(); |
1 | 578 |
|
54019 | 579 |
|
580 |
FlagSetting fl(_is_gc_active, true); |
|
1 | 581 |
|
54019 | 582 |
bool complete = full && (max_generation == OldGen); |
583 |
bool old_collects_young = complete && !ScavengeBeforeFullGC; |
|
584 |
bool do_young_collection = !old_collects_young && _young_gen->should_collect(full, size, is_tlab); |
|
1 | 585 |
|
54019 | 586 |
size_t young_prev_used = _young_gen->used(); |
587 |
size_t old_prev_used = _old_gen->used(); |
|
35061 | 588 |
|
54019 | 589 |
bool run_verification = total_collections() >= VerifyGCStartAt; |
590 |
bool prepared_for_verification = false; |
|
591 |
bool do_full_collection = false; |
|
592 |
||
593 |
if (do_young_collection) { |
|
594 |
GCIdMark gc_id_mark; |
|
595 |
GCTraceCPUTime tcpu; |
|
596 |
GCTraceTime(Info, gc) t("Pause Young", NULL, gc_cause(), true); |
|
597 |
||
598 |
print_heap_before_gc(); |
|
599 |
||
600 |
if (run_verification && VerifyGCLevel <= 0 && VerifyBeforeGC) { |
|
601 |
prepare_for_verify(); |
|
602 |
prepared_for_verification = true; |
|
35061 | 603 |
} |
604 |
||
1 | 605 |
gc_prologue(complete); |
606 |
increment_total_collections(complete); |
|
607 |
||
54019 | 608 |
collect_generation(_young_gen, |
609 |
full, |
|
610 |
size, |
|
611 |
is_tlab, |
|
612 |
run_verification && VerifyGCLevel <= 0, |
|
613 |
do_clear_all_soft_refs, |
|
614 |
false); |
|
1 | 615 |
|
54019 | 616 |
if (size > 0 && (!is_tlab || _young_gen->supports_tlab_allocation()) && |
617 |
size * HeapWordSize <= _young_gen->unsafe_max_alloc_nogc()) { |
|
618 |
// Allocation request was met by young GC. |
|
619 |
size = 0; |
|
620 |
} |
|
29200 | 621 |
|
54019 | 622 |
// Ask if young collection is enough. If so, do the final steps for young collection, |
623 |
// and fallthrough to the end. |
|
624 |
do_full_collection = should_do_full_collection(size, full, is_tlab, max_generation); |
|
625 |
if (!do_full_collection) { |
|
626 |
// Adjust generation sizes. |
|
627 |
_young_gen->compute_new_size(); |
|
29200 | 628 |
|
54019 | 629 |
print_heap_change(young_prev_used, old_prev_used); |
630 |
MetaspaceUtils::print_metaspace_change(metadata_prev_used); |
|
631 |
||
632 |
// Track memory usage and detect low memory after GC finishes |
|
633 |
MemoryService::track_memory_usage(); |
|
634 |
||
635 |
gc_epilogue(complete); |
|
1 | 636 |
} |
637 |
||
54019 | 638 |
print_heap_after_gc(); |
27252 | 639 |
|
54019 | 640 |
} else { |
641 |
// No young collection, ask if we need to perform Full collection. |
|
642 |
do_full_collection = should_do_full_collection(size, full, is_tlab, max_generation); |
|
643 |
} |
|
27252 | 644 |
|
54019 | 645 |
if (do_full_collection) { |
646 |
GCIdMark gc_id_mark; |
|
647 |
GCTraceCPUTime tcpu; |
|
648 |
GCTraceTime(Info, gc) t("Pause Full", NULL, gc_cause(), true); |
|
649 |
||
650 |
print_heap_before_gc(); |
|
27252 | 651 |
|
54019 | 652 |
if (!prepared_for_verification && run_verification && |
653 |
VerifyGCLevel <= 1 && VerifyBeforeGC) { |
|
654 |
prepare_for_verify(); |
|
655 |
} |
|
656 |
||
657 |
if (!do_young_collection) { |
|
658 |
gc_prologue(complete); |
|
659 |
increment_total_collections(complete); |
|
1 | 660 |
} |
661 |
||
54019 | 662 |
// Accounting quirk: total full collections would be incremented when "complete" |
663 |
// is set, by calling increment_total_collections above. However, we also need to |
|
664 |
// account Full collections that had "complete" unset. |
|
665 |
if (!complete) { |
|
666 |
increment_total_full_collections(); |
|
667 |
} |
|
668 |
||
669 |
collect_generation(_old_gen, |
|
670 |
full, |
|
671 |
size, |
|
672 |
is_tlab, |
|
673 |
run_verification && VerifyGCLevel <= 1, |
|
674 |
do_clear_all_soft_refs, |
|
675 |
true); |
|
1 | 676 |
|
29200 | 677 |
// Adjust generation sizes. |
54019 | 678 |
_old_gen->compute_new_size(); |
29200 | 679 |
_young_gen->compute_new_size(); |
1 | 680 |
|
54019 | 681 |
// Delete metaspaces for unloaded class loaders and clean up loader_data graph |
682 |
ClassLoaderDataGraph::purge(); |
|
683 |
MetaspaceUtils::verify_metrics(); |
|
684 |
// Resize the metaspace capacity after full collections |
|
685 |
MetaspaceGC::compute_new_size(); |
|
686 |
update_full_collections_completed(); |
|
1 | 687 |
|
52027 | 688 |
print_heap_change(young_prev_used, old_prev_used); |
689 |
MetaspaceUtils::print_metaspace_change(metadata_prev_used); |
|
690 |
||
1 | 691 |
// Track memory usage and detect low memory after GC finishes |
692 |
MemoryService::track_memory_usage(); |
|
693 |
||
54032
ac09c2498c64
8220290: gc/arguments/TestSurvivorRatioFlag.java fails after JDK-8215221 with CMS
shade
parents:
54019
diff
changeset
|
694 |
// Need to tell the epilogue code we are done with Full GC, regardless what was |
ac09c2498c64
8220290: gc/arguments/TestSurvivorRatioFlag.java fails after JDK-8215221 with CMS
shade
parents:
54019
diff
changeset
|
695 |
// the initial value for "complete" flag. |
ac09c2498c64
8220290: gc/arguments/TestSurvivorRatioFlag.java fails after JDK-8215221 with CMS
shade
parents:
54019
diff
changeset
|
696 |
gc_epilogue(true); |
1 | 697 |
|
54019 | 698 |
BiasedLocking::restore_marks(); |
699 |
||
700 |
print_heap_after_gc(); |
|
1 | 701 |
} |
702 |
||
2010
c13462bbad17
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
1893
diff
changeset
|
703 |
#ifdef TRACESPINNING |
c13462bbad17
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
1893
diff
changeset
|
704 |
ParallelTaskTerminator::print_termination_counts(); |
c13462bbad17
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
1893
diff
changeset
|
705 |
#endif |
1 | 706 |
} |
707 |
||
54019 | 708 |
bool GenCollectedHeap::should_do_full_collection(size_t size, bool full, bool is_tlab, |
709 |
GenCollectedHeap::GenerationType max_gen) const { |
|
710 |
return max_gen == OldGen && _old_gen->should_collect(full, size, is_tlab); |
|
711 |
} |
|
712 |
||
47624
b055cb5170f5
8185141: Generalize scavengeable nmethod root handling
eosterlund
parents:
47622
diff
changeset
|
713 |
void GenCollectedHeap::register_nmethod(nmethod* nm) { |
54122
4b1426ed1c44
8220343: Move scavenge_root_nmethods from shared code
stefank
parents:
54093
diff
changeset
|
714 |
ScavengableNMethods::register_nmethod(nm); |
4b1426ed1c44
8220343: Move scavenge_root_nmethods from shared code
stefank
parents:
54093
diff
changeset
|
715 |
} |
4b1426ed1c44
8220343: Move scavenge_root_nmethods from shared code
stefank
parents:
54093
diff
changeset
|
716 |
|
4b1426ed1c44
8220343: Move scavenge_root_nmethods from shared code
stefank
parents:
54093
diff
changeset
|
717 |
void GenCollectedHeap::unregister_nmethod(nmethod* nm) { |
4b1426ed1c44
8220343: Move scavenge_root_nmethods from shared code
stefank
parents:
54093
diff
changeset
|
718 |
ScavengableNMethods::unregister_nmethod(nm); |
47624
b055cb5170f5
8185141: Generalize scavengeable nmethod root handling
eosterlund
parents:
47622
diff
changeset
|
719 |
} |
b055cb5170f5
8185141: Generalize scavengeable nmethod root handling
eosterlund
parents:
47622
diff
changeset
|
720 |
|
b055cb5170f5
8185141: Generalize scavengeable nmethod root handling
eosterlund
parents:
47622
diff
changeset
|
721 |
void GenCollectedHeap::verify_nmethod(nmethod* nm) { |
54122
4b1426ed1c44
8220343: Move scavenge_root_nmethods from shared code
stefank
parents:
54093
diff
changeset
|
722 |
ScavengableNMethods::verify_nmethod(nm); |
4b1426ed1c44
8220343: Move scavenge_root_nmethods from shared code
stefank
parents:
54093
diff
changeset
|
723 |
} |
4b1426ed1c44
8220343: Move scavenge_root_nmethods from shared code
stefank
parents:
54093
diff
changeset
|
724 |
|
4b1426ed1c44
8220343: Move scavenge_root_nmethods from shared code
stefank
parents:
54093
diff
changeset
|
725 |
void GenCollectedHeap::flush_nmethod(nmethod* nm) { |
54177
b4779a44476b
8220606: Move ScavengableNMethods unlinking to unregister_nmethod
stefank
parents:
54122
diff
changeset
|
726 |
// Do nothing. |
54122
4b1426ed1c44
8220343: Move scavenge_root_nmethods from shared code
stefank
parents:
54093
diff
changeset
|
727 |
} |
4b1426ed1c44
8220343: Move scavenge_root_nmethods from shared code
stefank
parents:
54093
diff
changeset
|
728 |
|
54178 | 729 |
void GenCollectedHeap::prune_scavengable_nmethods() { |
54122
4b1426ed1c44
8220343: Move scavenge_root_nmethods from shared code
stefank
parents:
54093
diff
changeset
|
730 |
ScavengableNMethods::prune_nmethods(); |
47624
b055cb5170f5
8185141: Generalize scavengeable nmethod root handling
eosterlund
parents:
47622
diff
changeset
|
731 |
} |
b055cb5170f5
8185141: Generalize scavengeable nmethod root handling
eosterlund
parents:
47622
diff
changeset
|
732 |
|
1 | 733 |
HeapWord* GenCollectedHeap::satisfy_failed_allocation(size_t size, bool is_tlab) { |
49046
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
734 |
GCCauseSetter x(this, GCCause::_allocation_failure); |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
735 |
HeapWord* result = NULL; |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
736 |
|
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
737 |
assert(size != 0, "Precondition violated"); |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
738 |
if (GCLocker::is_active_and_needs_gc()) { |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
739 |
// GC locker is active; instead of a collection we will attempt |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
740 |
// to expand the heap, if there's room for expansion. |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
741 |
if (!is_maximal_no_gc()) { |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
742 |
result = expand_heap_and_allocate(size, is_tlab); |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
743 |
} |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
744 |
return result; // Could be null if we are out of space. |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
745 |
} else if (!incremental_collection_will_fail(false /* don't consult_young */)) { |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
746 |
// Do an incremental collection. |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
747 |
do_collection(false, // full |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
748 |
false, // clear_all_soft_refs |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
749 |
size, // size |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
750 |
is_tlab, // is_tlab |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
751 |
GenCollectedHeap::OldGen); // max_generation |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
752 |
} else { |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
753 |
log_trace(gc)(" :: Trying full because partial may fail :: "); |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
754 |
// Try a full collection; see delta for bug id 6266275 |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
755 |
// for the original code and why this has been simplified |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
756 |
// with from-space allocation criteria modified and |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
757 |
// such allocation moved out of the safepoint path. |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
758 |
do_collection(true, // full |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
759 |
false, // clear_all_soft_refs |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
760 |
size, // size |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
761 |
is_tlab, // is_tlab |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
762 |
GenCollectedHeap::OldGen); // max_generation |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
763 |
} |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
764 |
|
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
765 |
result = attempt_allocation(size, is_tlab, false /*first_only*/); |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
766 |
|
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
767 |
if (result != NULL) { |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
768 |
assert(is_in_reserved(result), "result not in heap"); |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
769 |
return result; |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
770 |
} |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
771 |
|
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
772 |
// OK, collection failed, try expansion. |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
773 |
result = expand_heap_and_allocate(size, is_tlab); |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
774 |
if (result != NULL) { |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
775 |
return result; |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
776 |
} |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
777 |
|
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
778 |
// If we reach this point, we're really out of memory. Try every trick |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
779 |
// we can to reclaim memory. Force collection of soft references. Force |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
780 |
// a complete compaction of the heap. Any additional methods for finding |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
781 |
// free memory should be here, especially if they are expensive. If this |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
782 |
// attempt fails, an OOM exception will be thrown. |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
783 |
{ |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
784 |
UIntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
785 |
|
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
786 |
do_collection(true, // full |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
787 |
true, // clear_all_soft_refs |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
788 |
size, // size |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
789 |
is_tlab, // is_tlab |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
790 |
GenCollectedHeap::OldGen); // max_generation |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
791 |
} |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
792 |
|
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
793 |
result = attempt_allocation(size, is_tlab, false /* first_only */); |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
794 |
if (result != NULL) { |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
795 |
assert(is_in_reserved(result), "result not in heap"); |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
796 |
return result; |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
797 |
} |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
798 |
|
49047
8f004146e407
8198515: Extract SoftReferencePolicy code out of CollectorPolicy
stefank
parents:
49046
diff
changeset
|
799 |
assert(!soft_ref_policy()->should_clear_all_soft_refs(), |
49046
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
800 |
"Flag should have been handled and cleared prior to this point"); |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
801 |
|
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
802 |
// What else? We might try synchronous finalization later. If the total |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
803 |
// space available is large enough for the allocation, then a more |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
804 |
// complete compaction phase than we've tried so far might be |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
805 |
// appropriate. |
c8e4dc1b9e39
8198511: Move allocation functions from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49044
diff
changeset
|
806 |
return NULL; |
1 | 807 |
} |
808 |
||
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
809 |
#ifdef ASSERT |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
810 |
class AssertNonScavengableClosure: public OopClosure { |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
811 |
public: |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
812 |
virtual void do_oop(oop* p) { |
29803 | 813 |
assert(!GenCollectedHeap::heap()->is_in_partial_collection(*p), |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
814 |
"Referent should not be scavengable."); } |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
815 |
virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
816 |
}; |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
817 |
static AssertNonScavengableClosure assert_is_non_scavengable_closure; |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
818 |
#endif |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
819 |
|
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30867
diff
changeset
|
820 |
void GenCollectedHeap::process_roots(StrongRootsScope* scope, |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
821 |
ScanningOption so, |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
822 |
OopClosure* strong_roots, |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
823 |
CLDClosure* strong_cld_closure, |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
824 |
CLDClosure* weak_cld_closure, |
36591
d0622cab5983
8150013: ParNew: Prune nmethods scavengable list.
cvarming
parents:
35939
diff
changeset
|
825 |
CodeBlobToOopClosure* code_roots) { |
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
826 |
// General roots. |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
827 |
assert(code_roots != NULL, "code root closure should always be set"); |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
828 |
// _n_termination for _process_strong_tasks should be set up stream |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
829 |
// in a method not running in a GC worker. Otherwise the GC worker |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
830 |
// could be trying to change the termination condition while the task |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
831 |
// is executing in another GC worker. |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
832 |
|
51598 | 833 |
if (_process_strong_tasks->try_claim_task(GCH_PS_ClassLoaderDataGraph_oops_do)) { |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
834 |
ClassLoaderDataGraph::roots_cld_do(strong_cld_closure, weak_cld_closure); |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
835 |
} |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
836 |
|
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
837 |
// Only process code roots from thread stacks if we aren't visiting the entire CodeCache anyway |
36591
d0622cab5983
8150013: ParNew: Prune nmethods scavengable list.
cvarming
parents:
35939
diff
changeset
|
838 |
CodeBlobToOopClosure* roots_from_code_p = (so & SO_AllCodeCache) ? NULL : code_roots; |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
839 |
|
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30867
diff
changeset
|
840 |
bool is_par = scope->n_threads() > 1; |
38074
8475fdc6dcc3
8154580: Save mirror in interpreter frame to enable cleanups of CLDClosure
coleenp
parents:
38011
diff
changeset
|
841 |
Threads::possibly_parallel_oops_do(is_par, strong_roots, roots_from_code_p); |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
842 |
|
51598 | 843 |
if (_process_strong_tasks->try_claim_task(GCH_PS_Universe_oops_do)) { |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
844 |
Universe::oops_do(strong_roots); |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
845 |
} |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
846 |
// Global (strong) JNI handles |
51598 | 847 |
if (_process_strong_tasks->try_claim_task(GCH_PS_JNIHandles_oops_do)) { |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
848 |
JNIHandles::oops_do(strong_roots); |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
849 |
} |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
850 |
|
51598 | 851 |
if (_process_strong_tasks->try_claim_task(GCH_PS_ObjectSynchronizer_oops_do)) { |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
852 |
ObjectSynchronizer::oops_do(strong_roots); |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
853 |
} |
51598 | 854 |
if (_process_strong_tasks->try_claim_task(GCH_PS_Management_oops_do)) { |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
855 |
Management::oops_do(strong_roots); |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
856 |
} |
51598 | 857 |
if (_process_strong_tasks->try_claim_task(GCH_PS_jvmti_oops_do)) { |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
858 |
JvmtiExport::oops_do(strong_roots); |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
859 |
} |
51598 | 860 |
if (UseAOT && _process_strong_tasks->try_claim_task(GCH_PS_aot_oops_do)) { |
42650 | 861 |
AOTLoader::oops_do(strong_roots); |
862 |
} |
|
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
863 |
|
51598 | 864 |
if (_process_strong_tasks->try_claim_task(GCH_PS_SystemDictionary_oops_do)) { |
50297
580744d900c8
8202813: Move vm_weak processing from SystemDictionary to WeakProcessor
coleenp
parents:
50059
diff
changeset
|
865 |
SystemDictionary::oops_do(strong_roots); |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
866 |
} |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
867 |
|
51598 | 868 |
if (_process_strong_tasks->try_claim_task(GCH_PS_CodeCache_oops_do)) { |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
869 |
if (so & SO_ScavengeCodeCache) { |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
870 |
assert(code_roots != NULL, "must supply closure for code cache"); |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
871 |
|
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
872 |
// We only visit parts of the CodeCache when scavenging. |
54178 | 873 |
ScavengableNMethods::nmethods_do(code_roots); |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
874 |
} |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
875 |
if (so & SO_AllCodeCache) { |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
876 |
assert(code_roots != NULL, "must supply closure for code cache"); |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
877 |
|
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
878 |
// CMSCollector uses this to do intermediate-strength collections. |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
879 |
// We scan the entire code cache, since CodeCache::do_unloading is not called. |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
880 |
CodeCache::blobs_do(code_roots); |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
881 |
} |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
882 |
// Verify that the code cache contents are not subject to |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
883 |
// movement by a scavenging collection. |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
884 |
DEBUG_ONLY(CodeBlobToOopClosure assert_code_is_non_scavengable(&assert_is_non_scavengable_closure, !CodeBlobToOopClosure::FixRelocations)); |
54122
4b1426ed1c44
8220343: Move scavenge_root_nmethods from shared code
stefank
parents:
54093
diff
changeset
|
885 |
DEBUG_ONLY(ScavengableNMethods::asserted_non_scavengable_nmethods_do(&assert_code_is_non_scavengable)); |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
886 |
} |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
887 |
} |
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29684
diff
changeset
|
888 |
|
41682
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
889 |
void GenCollectedHeap::young_process_roots(StrongRootsScope* scope, |
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
890 |
OopsInGenClosure* root_closure, |
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
891 |
OopsInGenClosure* old_gen_closure, |
53536
482109fae02b
8213229: Investigate treating StringTable as weak in young collections
tschatzl
parents:
52876
diff
changeset
|
892 |
CLDClosure* cld_closure) { |
41682
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
893 |
MarkingCodeBlobClosure mark_code_closure(root_closure, CodeBlobToOopClosure::FixRelocations); |
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
894 |
|
50297
580744d900c8
8202813: Move vm_weak processing from SystemDictionary to WeakProcessor
coleenp
parents:
50059
diff
changeset
|
895 |
process_roots(scope, SO_ScavengeCodeCache, root_closure, |
41682
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
896 |
cld_closure, cld_closure, &mark_code_closure); |
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
897 |
|
51598 | 898 |
if (_process_strong_tasks->try_claim_task(GCH_PS_younger_gens)) { |
41682
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
899 |
root_closure->reset_generation(); |
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
900 |
} |
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
901 |
|
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
902 |
// When collection is parallel, all threads get to cooperate to do |
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
903 |
// old generation scanning. |
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
904 |
old_gen_closure->set_generation(_old_gen); |
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
905 |
rem_set()->younger_refs_iterate(_old_gen, old_gen_closure, scope->n_threads()); |
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
906 |
old_gen_closure->reset_generation(); |
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
907 |
|
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
908 |
_process_strong_tasks->all_tasks_completed(scope->n_threads()); |
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
909 |
} |
b63330180476
8166276: Refactor gen_process_roots to allow simpler fix for 8165949
jwilhelm
parents:
41286
diff
changeset
|
910 |
|
41683
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
911 |
void GenCollectedHeap::full_process_roots(StrongRootsScope* scope, |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
912 |
bool is_adjust_phase, |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
913 |
ScanningOption so, |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
914 |
bool only_strong_roots, |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
915 |
OopsInGenClosure* root_closure, |
53536
482109fae02b
8213229: Investigate treating StringTable as weak in young collections
tschatzl
parents:
52876
diff
changeset
|
916 |
CLDClosure* cld_closure) { |
41683
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
917 |
MarkingCodeBlobClosure mark_code_closure(root_closure, is_adjust_phase); |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
918 |
CLDClosure* weak_cld_closure = only_strong_roots ? NULL : cld_closure; |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
919 |
|
50297
580744d900c8
8202813: Move vm_weak processing from SystemDictionary to WeakProcessor
coleenp
parents:
50059
diff
changeset
|
920 |
process_roots(scope, so, root_closure, cld_closure, weak_cld_closure, &mark_code_closure); |
41683
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
921 |
_process_strong_tasks->all_tasks_completed(scope->n_threads()); |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
922 |
} |
cd5d2527e163
8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
sjohanss
parents:
41682
diff
changeset
|
923 |
|
22882
195c8f70d605
8034761: Remove the do_code_roots parameter from process_strong_roots
stefank
parents:
22552
diff
changeset
|
924 |
void GenCollectedHeap::gen_process_weak_roots(OopClosure* root_closure) { |
47648
226b1fc611b9
8189359: Move native weak oops cleaning out of ReferenceProcessor
stefank
parents:
47624
diff
changeset
|
925 |
WeakProcessor::oops_do(root_closure); |
29200 | 926 |
_young_gen->ref_processor()->weak_oops_do(root_closure); |
927 |
_old_gen->ref_processor()->weak_oops_do(root_closure); |
|
1 | 928 |
} |
929 |
||
31780 | 930 |
bool GenCollectedHeap::no_allocs_since_save_marks() { |
931 |
return _young_gen->no_allocs_since_save_marks() && |
|
932 |
_old_gen->no_allocs_since_save_marks(); |
|
1 | 933 |
} |
934 |
||
935 |
bool GenCollectedHeap::supports_inline_contig_alloc() const { |
|
29200 | 936 |
return _young_gen->supports_inline_contig_alloc(); |
1 | 937 |
} |
938 |
||
41283
2615c024f3eb
8033552: Fix missing missing volatile specifiers in CAS operations in GC code
eosterlund
parents:
40523
diff
changeset
|
939 |
HeapWord* volatile* GenCollectedHeap::top_addr() const { |
29200 | 940 |
return _young_gen->top_addr(); |
1 | 941 |
} |
942 |
||
943 |
HeapWord** GenCollectedHeap::end_addr() const { |
|
29200 | 944 |
return _young_gen->end_addr(); |
1 | 945 |
} |
946 |
||
947 |
// public collection interfaces |
|
948 |
||
949 |
void GenCollectedHeap::collect(GCCause::Cause cause) { |
|
47622
817f2a7019e4
8179387: Factor out CMS specific code from GenCollectedHeap into its own subclass
rkennke
parents:
47546
diff
changeset
|
950 |
if (cause == GCCause::_wb_young_gc) { |
32623
390a27af5657
8134626: Misc cleanups after generation array removal
jwilhelm
parents:
32360
diff
changeset
|
951 |
// Young collection for the WhiteBox API. |
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
952 |
collect(cause, YoungGen); |
1 | 953 |
} else { |
954 |
#ifdef ASSERT |
|
26183
bbe259d3c8bc
8055098: WB API should be extended to provide information about size and age of object.
tschatzl
parents:
25730
diff
changeset
|
955 |
if (cause == GCCause::_scavenge_alot) { |
32623
390a27af5657
8134626: Misc cleanups after generation array removal
jwilhelm
parents:
32360
diff
changeset
|
956 |
// Young collection only. |
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
957 |
collect(cause, YoungGen); |
26183
bbe259d3c8bc
8055098: WB API should be extended to provide information about size and age of object.
tschatzl
parents:
25730
diff
changeset
|
958 |
} else { |
32623
390a27af5657
8134626: Misc cleanups after generation array removal
jwilhelm
parents:
32360
diff
changeset
|
959 |
// Stop-the-world full collection. |
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
960 |
collect(cause, OldGen); |
26183
bbe259d3c8bc
8055098: WB API should be extended to provide information about size and age of object.
tschatzl
parents:
25730
diff
changeset
|
961 |
} |
1 | 962 |
#else |
32623
390a27af5657
8134626: Misc cleanups after generation array removal
jwilhelm
parents:
32360
diff
changeset
|
963 |
// Stop-the-world full collection. |
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
964 |
collect(cause, OldGen); |
1 | 965 |
#endif |
966 |
} |
|
967 |
} |
|
968 |
||
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
969 |
void GenCollectedHeap::collect(GCCause::Cause cause, GenerationType max_generation) { |
1 | 970 |
// The caller doesn't have the Heap_lock |
971 |
assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
|
972 |
MutexLocker ml(Heap_lock); |
|
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
973 |
collect_locked(cause, max_generation); |
1 | 974 |
} |
975 |
||
976 |
void GenCollectedHeap::collect_locked(GCCause::Cause cause) { |
|
977 |
// The caller has the Heap_lock |
|
978 |
assert(Heap_lock->owned_by_self(), "this thread should own the Heap_lock"); |
|
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
979 |
collect_locked(cause, OldGen); |
1 | 980 |
} |
981 |
||
982 |
// this is the private collection interface |
|
983 |
// The Heap_lock is expected to be held on entry. |
|
984 |
||
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
985 |
void GenCollectedHeap::collect_locked(GCCause::Cause cause, GenerationType max_generation) { |
1 | 986 |
// Read the GC count while holding the Heap_lock |
987 |
unsigned int gc_count_before = total_collections(); |
|
988 |
unsigned int full_gc_count_before = total_full_collections(); |
|
989 |
{ |
|
990 |
MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back |
|
991 |
VM_GenCollectFull op(gc_count_before, full_gc_count_before, |
|
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
992 |
cause, max_generation); |
1 | 993 |
VMThread::execute(&op); |
994 |
} |
|
995 |
} |
|
996 |
||
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
997 |
void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs) { |
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
998 |
do_full_collection(clear_all_soft_refs, OldGen); |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
999 |
} |
1 | 1000 |
|
1001 |
void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs, |
|
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1002 |
GenerationType last_generation) { |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1003 |
GenerationType local_last_generation; |
7419
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
1004 |
if (!incremental_collection_will_fail(false /* don't consult_young */) && |
1 | 1005 |
gc_cause() == GCCause::_gc_locker) { |
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1006 |
local_last_generation = YoungGen; |
1 | 1007 |
} else { |
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1008 |
local_last_generation = last_generation; |
1 | 1009 |
} |
1010 |
||
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1011 |
do_collection(true, // full |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1012 |
clear_all_soft_refs, // clear_all_soft_refs |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1013 |
0, // size |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1014 |
false, // is_tlab |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1015 |
local_last_generation); // last_generation |
1 | 1016 |
// Hack XXX FIX ME !!! |
1017 |
// A scavenge may not have been attempted, or may have |
|
1018 |
// been attempted and failed, because the old gen was too full |
|
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1019 |
if (local_last_generation == YoungGen && gc_cause() == GCCause::_gc_locker && |
7419
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
1020 |
incremental_collection_will_fail(false /* don't consult_young */)) { |
35061 | 1021 |
log_debug(gc, jni)("GC locker: Trying a full collection because scavenge failed"); |
1 | 1022 |
// This time allow the old gen to be collected as well |
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1023 |
do_collection(true, // full |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1024 |
clear_all_soft_refs, // clear_all_soft_refs |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1025 |
0, // size |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1026 |
false, // is_tlab |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1027 |
OldGen); // last_generation |
1 | 1028 |
} |
1029 |
} |
|
1030 |
||
9935
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
1031 |
bool GenCollectedHeap::is_in_young(oop p) { |
29200 | 1032 |
bool result = ((HeapWord*)p) < _old_gen->reserved().start(); |
1033 |
assert(result == _young_gen->is_in_reserved(p), |
|
33105
294e48b4f704
8080775: Better argument formatting for assert() and friends
david
parents:
32735
diff
changeset
|
1034 |
"incorrect test - result=%d, p=" INTPTR_FORMAT, result, p2i((void*)p)); |
9935
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
1035 |
return result; |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
1036 |
} |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
1037 |
|
11247 | 1038 |
// Returns "TRUE" iff "p" points into the committed areas of the heap. |
1 | 1039 |
bool GenCollectedHeap::is_in(const void* p) const { |
29200 | 1040 |
return _young_gen->is_in(p) || _old_gen->is_in(p); |
1 | 1041 |
} |
1042 |
||
9935
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
1043 |
#ifdef ASSERT |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
1044 |
// Don't implement this by using is_in_young(). This method is used |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
1045 |
// in some cases to check that is_in_young() is correct. |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
1046 |
bool GenCollectedHeap::is_in_partial_collection(const void* p) { |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
1047 |
assert(is_in_reserved(p) || p == NULL, |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
1048 |
"Does not work if address is non-null and outside of the heap"); |
29200 | 1049 |
return p < _young_gen->reserved().end() && p != NULL; |
1 | 1050 |
} |
9935
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
1051 |
#endif |
1 | 1052 |
|
50752 | 1053 |
void GenCollectedHeap::oop_iterate(OopIterateClosure* cl) { |
29200 | 1054 |
_young_gen->oop_iterate(cl); |
1055 |
_old_gen->oop_iterate(cl); |
|
1 | 1056 |
} |
1057 |
||
1058 |
void GenCollectedHeap::object_iterate(ObjectClosure* cl) { |
|
29200 | 1059 |
_young_gen->object_iterate(cl); |
1060 |
_old_gen->object_iterate(cl); |
|
1 | 1061 |
} |
1062 |
||
1893
c82e388e17c5
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
1610
diff
changeset
|
1063 |
void GenCollectedHeap::safe_object_iterate(ObjectClosure* cl) { |
29200 | 1064 |
_young_gen->safe_object_iterate(cl); |
1065 |
_old_gen->safe_object_iterate(cl); |
|
1893
c82e388e17c5
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
1610
diff
changeset
|
1066 |
} |
c82e388e17c5
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
1610
diff
changeset
|
1067 |
|
1 | 1068 |
Space* GenCollectedHeap::space_containing(const void* addr) const { |
29200 | 1069 |
Space* res = _young_gen->space_containing(addr); |
1070 |
if (res != NULL) { |
|
1071 |
return res; |
|
1 | 1072 |
} |
29200 | 1073 |
res = _old_gen->space_containing(addr); |
1074 |
assert(res != NULL, "Could not find containing space"); |
|
1075 |
return res; |
|
1 | 1076 |
} |
1077 |
||
1078 |
HeapWord* GenCollectedHeap::block_start(const void* addr) const { |
|
1079 |
assert(is_in_reserved(addr), "block_start of address outside of heap"); |
|
29200 | 1080 |
if (_young_gen->is_in_reserved(addr)) { |
1081 |
assert(_young_gen->is_in(addr), "addr should be in allocated part of generation"); |
|
1082 |
return _young_gen->block_start(addr); |
|
1 | 1083 |
} |
29200 | 1084 |
|
1085 |
assert(_old_gen->is_in_reserved(addr), "Some generation should contain the address"); |
|
1086 |
assert(_old_gen->is_in(addr), "addr should be in allocated part of generation"); |
|
1087 |
return _old_gen->block_start(addr); |
|
1 | 1088 |
} |
1089 |
||
1090 |
bool GenCollectedHeap::block_is_obj(const HeapWord* addr) const { |
|
1091 |
assert(is_in_reserved(addr), "block_is_obj of address outside of heap"); |
|
1092 |
assert(block_start(addr) == addr, "addr must be a block start"); |
|
29200 | 1093 |
if (_young_gen->is_in_reserved(addr)) { |
1094 |
return _young_gen->block_is_obj(addr); |
|
1 | 1095 |
} |
29200 | 1096 |
|
1097 |
assert(_old_gen->is_in_reserved(addr), "Some generation should contain the address"); |
|
1098 |
return _old_gen->block_is_obj(addr); |
|
1 | 1099 |
} |
1100 |
||
1101 |
bool GenCollectedHeap::supports_tlab_allocation() const { |
|
29200 | 1102 |
assert(!_old_gen->supports_tlab_allocation(), "Old gen supports TLAB allocation?!"); |
1103 |
return _young_gen->supports_tlab_allocation(); |
|
1 | 1104 |
} |
1105 |
||
1106 |
size_t GenCollectedHeap::tlab_capacity(Thread* thr) const { |
|
29200 | 1107 |
assert(!_old_gen->supports_tlab_allocation(), "Old gen supports TLAB allocation?!"); |
1108 |
if (_young_gen->supports_tlab_allocation()) { |
|
1109 |
return _young_gen->tlab_capacity(); |
|
1 | 1110 |
} |
29200 | 1111 |
return 0; |
1 | 1112 |
} |
1113 |
||
22552 | 1114 |
size_t GenCollectedHeap::tlab_used(Thread* thr) const { |
29200 | 1115 |
assert(!_old_gen->supports_tlab_allocation(), "Old gen supports TLAB allocation?!"); |
1116 |
if (_young_gen->supports_tlab_allocation()) { |
|
1117 |
return _young_gen->tlab_used(); |
|
22552 | 1118 |
} |
29200 | 1119 |
return 0; |
22552 | 1120 |
} |
1121 |
||
1 | 1122 |
size_t GenCollectedHeap::unsafe_max_tlab_alloc(Thread* thr) const { |
29200 | 1123 |
assert(!_old_gen->supports_tlab_allocation(), "Old gen supports TLAB allocation?!"); |
1124 |
if (_young_gen->supports_tlab_allocation()) { |
|
1125 |
return _young_gen->unsafe_max_tlab_alloc(); |
|
1 | 1126 |
} |
29200 | 1127 |
return 0; |
1 | 1128 |
} |
1129 |
||
49945 | 1130 |
HeapWord* GenCollectedHeap::allocate_new_tlab(size_t min_size, |
1131 |
size_t requested_size, |
|
1132 |
size_t* actual_size) { |
|
1 | 1133 |
bool gc_overhead_limit_was_exceeded; |
49945 | 1134 |
HeapWord* result = mem_allocate_work(requested_size /* size */, |
1135 |
true /* is_tlab */, |
|
1136 |
&gc_overhead_limit_was_exceeded); |
|
1137 |
if (result != NULL) { |
|
1138 |
*actual_size = requested_size; |
|
1139 |
} |
|
1140 |
||
1141 |
return result; |
|
1 | 1142 |
} |
1143 |
||
1144 |
// Requires "*prev_ptr" to be non-NULL. Deletes and a block of minimal size |
|
1145 |
// from the list headed by "*prev_ptr". |
|
1146 |
static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) { |
|
1147 |
bool first = true; |
|
1148 |
size_t min_size = 0; // "first" makes this conceptually infinite. |
|
1149 |
ScratchBlock **smallest_ptr, *smallest; |
|
1150 |
ScratchBlock *cur = *prev_ptr; |
|
1151 |
while (cur) { |
|
1152 |
assert(*prev_ptr == cur, "just checking"); |
|
1153 |
if (first || cur->num_words < min_size) { |
|
1154 |
smallest_ptr = prev_ptr; |
|
1155 |
smallest = cur; |
|
1156 |
min_size = smallest->num_words; |
|
1157 |
first = false; |
|
1158 |
} |
|
1159 |
prev_ptr = &cur->next; |
|
1160 |
cur = cur->next; |
|
1161 |
} |
|
1162 |
smallest = *smallest_ptr; |
|
1163 |
*smallest_ptr = smallest->next; |
|
1164 |
return smallest; |
|
1165 |
} |
|
1166 |
||
1167 |
// Sort the scratch block list headed by res into decreasing size order, |
|
1168 |
// and set "res" to the result. |
|
1169 |
static void sort_scratch_list(ScratchBlock*& list) { |
|
1170 |
ScratchBlock* sorted = NULL; |
|
1171 |
ScratchBlock* unsorted = list; |
|
1172 |
while (unsorted) { |
|
1173 |
ScratchBlock *smallest = removeSmallestScratch(&unsorted); |
|
1174 |
smallest->next = sorted; |
|
1175 |
sorted = smallest; |
|
1176 |
} |
|
1177 |
list = sorted; |
|
1178 |
} |
|
1179 |
||
1180 |
ScratchBlock* GenCollectedHeap::gather_scratch(Generation* requestor, |
|
1181 |
size_t max_alloc_words) { |
|
1182 |
ScratchBlock* res = NULL; |
|
29200 | 1183 |
_young_gen->contribute_scratch(res, requestor, max_alloc_words); |
1184 |
_old_gen->contribute_scratch(res, requestor, max_alloc_words); |
|
1 | 1185 |
sort_scratch_list(res); |
1186 |
return res; |
|
1187 |
} |
|
1188 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1189 |
void GenCollectedHeap::release_scratch() { |
29200 | 1190 |
_young_gen->reset_scratch(); |
1191 |
_old_gen->reset_scratch(); |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1192 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1193 |
|
1 | 1194 |
class GenPrepareForVerifyClosure: public GenCollectedHeap::GenClosure { |
1195 |
void do_generation(Generation* gen) { |
|
1196 |
gen->prepare_for_verify(); |
|
1197 |
} |
|
1198 |
}; |
|
1199 |
||
1200 |
void GenCollectedHeap::prepare_for_verify() { |
|
1201 |
ensure_parsability(false); // no need to retire TLABs |
|
1202 |
GenPrepareForVerifyClosure blk; |
|
1203 |
generation_iterate(&blk, false); |
|
1204 |
} |
|
1205 |
||
1206 |
void GenCollectedHeap::generation_iterate(GenClosure* cl, |
|
1207 |
bool old_to_young) { |
|
1208 |
if (old_to_young) { |
|
29200 | 1209 |
cl->do_generation(_old_gen); |
1210 |
cl->do_generation(_young_gen); |
|
1 | 1211 |
} else { |
29200 | 1212 |
cl->do_generation(_young_gen); |
1213 |
cl->do_generation(_old_gen); |
|
1 | 1214 |
} |
1215 |
} |
|
1216 |
||
1217 |
bool GenCollectedHeap::is_maximal_no_gc() const { |
|
29200 | 1218 |
return _young_gen->is_maximal_no_gc() && _old_gen->is_maximal_no_gc(); |
1 | 1219 |
} |
1220 |
||
1221 |
void GenCollectedHeap::save_marks() { |
|
29200 | 1222 |
_young_gen->save_marks(); |
1223 |
_old_gen->save_marks(); |
|
1 | 1224 |
} |
1225 |
||
1226 |
GenCollectedHeap* GenCollectedHeap::heap() { |
|
30258
413e15d1b146
8077415: Remove duplicate variables holding the CollectedHeap
pliden
parents:
30177
diff
changeset
|
1227 |
CollectedHeap* heap = Universe::heap(); |
413e15d1b146
8077415: Remove duplicate variables holding the CollectedHeap
pliden
parents:
30177
diff
changeset
|
1228 |
assert(heap != NULL, "Uninitialized access to GenCollectedHeap::heap()"); |
49628
88478047bc8f
8199918: Shorten names of CollectedHeap::Name members
pliden
parents:
49594
diff
changeset
|
1229 |
assert(heap->kind() == CollectedHeap::Serial || |
88478047bc8f
8199918: Shorten names of CollectedHeap::Name members
pliden
parents:
49594
diff
changeset
|
1230 |
heap->kind() == CollectedHeap::CMS, "Invalid name"); |
47622
817f2a7019e4
8179387: Factor out CMS specific code from GenCollectedHeap into its own subclass
rkennke
parents:
47546
diff
changeset
|
1231 |
return (GenCollectedHeap*) heap; |
1 | 1232 |
} |
1233 |
||
49982 | 1234 |
#if INCLUDE_SERIALGC |
1 | 1235 |
void GenCollectedHeap::prepare_for_compaction() { |
1236 |
// Start by compacting into same gen. |
|
29200 | 1237 |
CompactPoint cp(_old_gen); |
1238 |
_old_gen->prepare_for_compaction(&cp); |
|
1239 |
_young_gen->prepare_for_compaction(&cp); |
|
1 | 1240 |
} |
49982 | 1241 |
#endif // INCLUDE_SERIALGC |
1 | 1242 |
|
35061 | 1243 |
void GenCollectedHeap::verify(VerifyOption option /* ignored */) { |
1244 |
log_debug(gc, verify)("%s", _old_gen->name()); |
|
29200 | 1245 |
_old_gen->verify(); |
1246 |
||
35061 | 1247 |
log_debug(gc, verify)("%s", _old_gen->name()); |
29200 | 1248 |
_young_gen->verify(); |
1249 |
||
35061 | 1250 |
log_debug(gc, verify)("RemSet"); |
1 | 1251 |
rem_set()->verify(); |
1252 |
} |
|
1253 |
||
1254 |
void GenCollectedHeap::print_on(outputStream* st) const { |
|
29200 | 1255 |
_young_gen->print_on(st); |
1256 |
_old_gen->print_on(st); |
|
49389
9ef2eee8ca7c
8199430: Rename MetaspaceAux to something more meaningful
stuefe
parents:
49164
diff
changeset
|
1257 |
MetaspaceUtils::print_on(st); |
1 | 1258 |
} |
1259 |
||
1260 |
void GenCollectedHeap::gc_threads_do(ThreadClosure* tc) const { |
|
1261 |
} |
|
1262 |
||
1263 |
void GenCollectedHeap::print_gc_threads_on(outputStream* st) const { |
|
16685
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16680
diff
changeset
|
1264 |
} |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16680
diff
changeset
|
1265 |
|
1 | 1266 |
void GenCollectedHeap::print_tracing_info() const { |
47546
64ba55ba8516
8184286: print_tracing_info() does not use Unified Logging for output
sjohanss
parents:
47216
diff
changeset
|
1267 |
if (log_is_enabled(Debug, gc, heap, exit)) { |
64ba55ba8516
8184286: print_tracing_info() does not use Unified Logging for output
sjohanss
parents:
47216
diff
changeset
|
1268 |
LogStreamHandle(Debug, gc, heap, exit) lsh; |
64ba55ba8516
8184286: print_tracing_info() does not use Unified Logging for output
sjohanss
parents:
47216
diff
changeset
|
1269 |
_young_gen->print_summary_info_on(&lsh); |
64ba55ba8516
8184286: print_tracing_info() does not use Unified Logging for output
sjohanss
parents:
47216
diff
changeset
|
1270 |
_old_gen->print_summary_info_on(&lsh); |
1 | 1271 |
} |
1272 |
} |
|
1273 |
||
35061 | 1274 |
void GenCollectedHeap::print_heap_change(size_t young_prev_used, size_t old_prev_used) const { |
1275 |
log_info(gc, heap)("%s: " SIZE_FORMAT "K->" SIZE_FORMAT "K(" SIZE_FORMAT "K)", |
|
1276 |
_young_gen->short_name(), young_prev_used / K, _young_gen->used() /K, _young_gen->capacity() /K); |
|
1277 |
log_info(gc, heap)("%s: " SIZE_FORMAT "K->" SIZE_FORMAT "K(" SIZE_FORMAT "K)", |
|
1278 |
_old_gen->short_name(), old_prev_used / K, _old_gen->used() /K, _old_gen->capacity() /K); |
|
1 | 1279 |
} |
1280 |
||
1281 |
class GenGCPrologueClosure: public GenCollectedHeap::GenClosure { |
|
1282 |
private: |
|
1283 |
bool _full; |
|
1284 |
public: |
|
1285 |
void do_generation(Generation* gen) { |
|
1286 |
gen->gc_prologue(_full); |
|
1287 |
} |
|
1288 |
GenGCPrologueClosure(bool full) : _full(full) {}; |
|
1289 |
}; |
|
1290 |
||
1291 |
void GenCollectedHeap::gc_prologue(bool full) { |
|
1292 |
assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
|
1293 |
||
1294 |
// Fill TLAB's and such |
|
1295 |
ensure_parsability(true); // retire TLABs |
|
1296 |
||
1297 |
// Walk generations |
|
1298 |
GenGCPrologueClosure blk(full); |
|
1299 |
generation_iterate(&blk, false); // not old-to-young. |
|
1300 |
}; |
|
1301 |
||
1302 |
class GenGCEpilogueClosure: public GenCollectedHeap::GenClosure { |
|
1303 |
private: |
|
1304 |
bool _full; |
|
1305 |
public: |
|
1306 |
void do_generation(Generation* gen) { |
|
1307 |
gen->gc_epilogue(_full); |
|
1308 |
} |
|
1309 |
GenGCEpilogueClosure(bool full) : _full(full) {}; |
|
1310 |
}; |
|
1311 |
||
1312 |
void GenCollectedHeap::gc_epilogue(bool full) { |
|
47799 | 1313 |
#if COMPILER2_OR_JVMCI |
1 | 1314 |
assert(DerivedPointerTable::is_empty(), "derived pointer present"); |
1315 |
size_t actual_gap = pointer_delta((HeapWord*) (max_uintx-3), *(end_addr())); |
|
43455
96560cffef4d
8166002: Emulate client build on platforms with reduced virtual address space
jcm
parents:
42650
diff
changeset
|
1316 |
guarantee(is_client_compilation_mode_vm() || actual_gap > (size_t)FastAllocateSizeLimit, "inline allocation wraps"); |
47799 | 1317 |
#endif // COMPILER2_OR_JVMCI |
1 | 1318 |
|
1319 |
resize_all_tlabs(); |
|
1320 |
||
1321 |
GenGCEpilogueClosure blk(full); |
|
1322 |
generation_iterate(&blk, false); // not old-to-young. |
|
1323 |
||
10022
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
9997
diff
changeset
|
1324 |
if (!CleanChunkPoolAsync) { |
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
9997
diff
changeset
|
1325 |
Chunk::clean_chunk_pool(); |
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
9997
diff
changeset
|
1326 |
} |
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
9997
diff
changeset
|
1327 |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
1328 |
MetaspaceCounters::update_performance_counters(); |
19322
e35f9ed4f081
8014659: NPG: performance counters for compressed klass space
ehelin
parents:
19286
diff
changeset
|
1329 |
CompressedClassSpaceCounters::update_performance_counters(); |
1 | 1330 |
}; |
1331 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1332 |
#ifndef PRODUCT |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1333 |
class GenGCSaveTopsBeforeGCClosure: public GenCollectedHeap::GenClosure { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1334 |
private: |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1335 |
public: |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1336 |
void do_generation(Generation* gen) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1337 |
gen->record_spaces_top(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1338 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1339 |
}; |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1340 |
|
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1341 |
void GenCollectedHeap::record_gen_tops_before_GC() { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1342 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1343 |
GenGCSaveTopsBeforeGCClosure blk; |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1344 |
generation_iterate(&blk, false); // not old-to-young. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1345 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1346 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1347 |
#endif // not PRODUCT |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1348 |
|
1 | 1349 |
class GenEnsureParsabilityClosure: public GenCollectedHeap::GenClosure { |
1350 |
public: |
|
1351 |
void do_generation(Generation* gen) { |
|
1352 |
gen->ensure_parsability(); |
|
1353 |
} |
|
1354 |
}; |
|
1355 |
||
1356 |
void GenCollectedHeap::ensure_parsability(bool retire_tlabs) { |
|
1357 |
CollectedHeap::ensure_parsability(retire_tlabs); |
|
1358 |
GenEnsureParsabilityClosure ep_cl; |
|
1359 |
generation_iterate(&ep_cl, false); |
|
1360 |
} |
|
1361 |
||
19286
48394008c803
8022800: Use specific generations rather than generation iteration
brutisso
parents:
18687
diff
changeset
|
1362 |
oop GenCollectedHeap::handle_failed_promotion(Generation* old_gen, |
1 | 1363 |
oop obj, |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1364 |
size_t obj_size) { |
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
1365 |
guarantee(old_gen == _old_gen, "We only get here with an old generation"); |
1 | 1366 |
assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
1367 |
HeapWord* result = NULL; |
|
1368 |
||
19286
48394008c803
8022800: Use specific generations rather than generation iteration
brutisso
parents:
18687
diff
changeset
|
1369 |
result = old_gen->expand_and_allocate(obj_size, false); |
1 | 1370 |
|
1371 |
if (result != NULL) { |
|
1372 |
Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); |
|
1373 |
} |
|
1374 |
return oop(result); |
|
1375 |
} |
|
1376 |
||
1377 |
class GenTimeOfLastGCClosure: public GenCollectedHeap::GenClosure { |
|
1378 |
jlong _time; // in ms |
|
1379 |
jlong _now; // in ms |
|
1380 |
||
1381 |
public: |
|
1382 |
GenTimeOfLastGCClosure(jlong now) : _time(now), _now(now) { } |
|
1383 |
||
1384 |
jlong time() { return _time; } |
|
1385 |
||
1386 |
void do_generation(Generation* gen) { |
|
1387 |
_time = MIN2(_time, gen->time_of_last_gc(_now)); |
|
1388 |
} |
|
1389 |
}; |
|
1390 |
||
1391 |
jlong GenCollectedHeap::millis_since_last_gc() { |
|
41284
b4276ec89d0d
8164482: [REDO] G1 does not implement millis_since_last_gc which is needed by RMI GC
jprovino
parents:
40523
diff
changeset
|
1392 |
// javaTimeNanos() is guaranteed to be monotonically non-decreasing |
b4276ec89d0d
8164482: [REDO] G1 does not implement millis_since_last_gc which is needed by RMI GC
jprovino
parents:
40523
diff
changeset
|
1393 |
// provided the underlying platform provides such a time source |
b4276ec89d0d
8164482: [REDO] G1 does not implement millis_since_last_gc which is needed by RMI GC
jprovino
parents:
40523
diff
changeset
|
1394 |
// (and it is bug free). So we still have to guard against getting |
b4276ec89d0d
8164482: [REDO] G1 does not implement millis_since_last_gc which is needed by RMI GC
jprovino
parents:
40523
diff
changeset
|
1395 |
// back a time later than 'now'. |
11251
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
11247
diff
changeset
|
1396 |
jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
1 | 1397 |
GenTimeOfLastGCClosure tolgc_cl(now); |
1398 |
// iterate over generations getting the oldest |
|
1399 |
// time that a generation was collected |
|
1400 |
generation_iterate(&tolgc_cl, false); |
|
11251
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
11247
diff
changeset
|
1401 |
|
1 | 1402 |
jlong retVal = now - tolgc_cl.time(); |
1403 |
if (retVal < 0) { |
|
41284
b4276ec89d0d
8164482: [REDO] G1 does not implement millis_since_last_gc which is needed by RMI GC
jprovino
parents:
40523
diff
changeset
|
1404 |
log_warning(gc)("millis_since_last_gc() would return : " JLONG_FORMAT |
b4276ec89d0d
8164482: [REDO] G1 does not implement millis_since_last_gc which is needed by RMI GC
jprovino
parents:
40523
diff
changeset
|
1405 |
". returning zero instead.", retVal); |
1 | 1406 |
return 0; |
1407 |
} |
|
1408 |
return retVal; |
|
1409 |
} |