author | goetz |
Mon, 18 Jan 2016 10:25:41 +0100 | |
changeset 35862 | 411842d0c882 |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2016, 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 "gc/serial/defNewGeneration.inline.hpp" |
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#include "gc/shared/ageTable.inline.hpp" |
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#include "gc/shared/cardTableRS.hpp" |
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#include "gc/shared/collectorCounters.hpp" |
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#include "gc/shared/gcHeapSummary.hpp" |
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#include "gc/shared/gcLocker.inline.hpp" |
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#include "gc/shared/gcPolicyCounters.hpp" |
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#include "gc/shared/gcTimer.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/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/referencePolicy.hpp" |
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#include "gc/shared/space.inline.hpp" |
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#include "gc/shared/spaceDecorator.hpp" |
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#include "gc/shared/strongRootsScope.hpp" |
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#include "logging/log.hpp" |
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#include "memory/iterator.hpp" |
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#include "oops/instanceRefKlass.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/atomic.inline.hpp" |
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#include "runtime/java.hpp" |
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#include "runtime/prefetch.inline.hpp" |
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#include "runtime/thread.inline.hpp" |
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#include "utilities/copy.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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#include "utilities/stack.inline.hpp" |
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#if INCLUDE_ALL_GCS |
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#include "gc/cms/parOopClosures.hpp" |
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#endif |
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// |
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// DefNewGeneration functions. |
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// Methods of protected closure types. |
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DefNewGeneration::IsAliveClosure::IsAliveClosure(Generation* young_gen) : _young_gen(young_gen) { |
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assert(_young_gen->kind() == Generation::ParNew || |
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_young_gen->kind() == Generation::DefNew, "Expected the young generation here"); |
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} |
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bool DefNewGeneration::IsAliveClosure::do_object_b(oop p) { |
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return (HeapWord*)p >= _young_gen->reserved().end() || p->is_forwarded(); |
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} |
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DefNewGeneration::KeepAliveClosure:: |
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KeepAliveClosure(ScanWeakRefClosure* cl) : _cl(cl) { |
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_rs = GenCollectedHeap::heap()->rem_set(); |
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} |
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void DefNewGeneration::KeepAliveClosure::do_oop(oop* p) { DefNewGeneration::KeepAliveClosure::do_oop_work(p); } |
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void DefNewGeneration::KeepAliveClosure::do_oop(narrowOop* p) { DefNewGeneration::KeepAliveClosure::do_oop_work(p); } |
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DefNewGeneration::FastKeepAliveClosure:: |
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FastKeepAliveClosure(DefNewGeneration* g, ScanWeakRefClosure* cl) : |
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DefNewGeneration::KeepAliveClosure(cl) { |
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_boundary = g->reserved().end(); |
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} |
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void DefNewGeneration::FastKeepAliveClosure::do_oop(oop* p) { DefNewGeneration::FastKeepAliveClosure::do_oop_work(p); } |
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void DefNewGeneration::FastKeepAliveClosure::do_oop(narrowOop* p) { DefNewGeneration::FastKeepAliveClosure::do_oop_work(p); } |
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DefNewGeneration::EvacuateFollowersClosure:: |
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EvacuateFollowersClosure(GenCollectedHeap* gch, |
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ScanClosure* cur, |
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ScanClosure* older) : |
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_gch(gch), _scan_cur_or_nonheap(cur), _scan_older(older) |
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{} |
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void DefNewGeneration::EvacuateFollowersClosure::do_void() { |
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do { |
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_gch->oop_since_save_marks_iterate(GenCollectedHeap::YoungGen, _scan_cur_or_nonheap, _scan_older); |
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} while (!_gch->no_allocs_since_save_marks()); |
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} |
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DefNewGeneration::FastEvacuateFollowersClosure:: |
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FastEvacuateFollowersClosure(GenCollectedHeap* gch, |
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FastScanClosure* cur, |
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FastScanClosure* older) : |
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_gch(gch), _scan_cur_or_nonheap(cur), _scan_older(older) |
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{ |
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assert(_gch->young_gen()->kind() == Generation::DefNew, "Generation should be DefNew"); |
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_young_gen = (DefNewGeneration*)_gch->young_gen(); |
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} |
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void DefNewGeneration::FastEvacuateFollowersClosure::do_void() { |
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do { |
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_gch->oop_since_save_marks_iterate(GenCollectedHeap::YoungGen, _scan_cur_or_nonheap, _scan_older); |
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} while (!_gch->no_allocs_since_save_marks()); |
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guarantee(_young_gen->promo_failure_scan_is_complete(), "Failed to finish scan"); |
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} |
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ScanClosure::ScanClosure(DefNewGeneration* g, bool gc_barrier) : |
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OopsInKlassOrGenClosure(g), _g(g), _gc_barrier(gc_barrier) |
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{ |
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_boundary = _g->reserved().end(); |
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} |
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void ScanClosure::do_oop(oop* p) { ScanClosure::do_oop_work(p); } |
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void ScanClosure::do_oop(narrowOop* p) { ScanClosure::do_oop_work(p); } |
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FastScanClosure::FastScanClosure(DefNewGeneration* g, bool gc_barrier) : |
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OopsInKlassOrGenClosure(g), _g(g), _gc_barrier(gc_barrier) |
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{ |
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_boundary = _g->reserved().end(); |
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} |
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void FastScanClosure::do_oop(oop* p) { FastScanClosure::do_oop_work(p); } |
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void FastScanClosure::do_oop(narrowOop* p) { FastScanClosure::do_oop_work(p); } |
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void KlassScanClosure::do_klass(Klass* klass) { |
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NOT_PRODUCT(ResourceMark rm); |
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log_develop_trace(gc, scavenge)("KlassScanClosure::do_klass " PTR_FORMAT ", %s, dirty: %s", |
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p2i(klass), |
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klass->external_name(), |
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klass->has_modified_oops() ? "true" : "false"); |
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// If the klass has not been dirtied we know that there's |
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// no references into the young gen and we can skip it. |
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if (klass->has_modified_oops()) { |
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if (_accumulate_modified_oops) { |
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klass->accumulate_modified_oops(); |
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} |
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// Clear this state since we're going to scavenge all the metadata. |
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klass->clear_modified_oops(); |
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// Tell the closure which Klass is being scanned so that it can be dirtied |
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// if oops are left pointing into the young gen. |
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_scavenge_closure->set_scanned_klass(klass); |
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klass->oops_do(_scavenge_closure); |
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_scavenge_closure->set_scanned_klass(NULL); |
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} |
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} |
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ScanWeakRefClosure::ScanWeakRefClosure(DefNewGeneration* g) : |
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_g(g) |
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{ |
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_boundary = _g->reserved().end(); |
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} |
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void ScanWeakRefClosure::do_oop(oop* p) { ScanWeakRefClosure::do_oop_work(p); } |
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void ScanWeakRefClosure::do_oop(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); } |
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void FilteringClosure::do_oop(oop* p) { FilteringClosure::do_oop_work(p); } |
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void FilteringClosure::do_oop(narrowOop* p) { FilteringClosure::do_oop_work(p); } |
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KlassScanClosure::KlassScanClosure(OopsInKlassOrGenClosure* scavenge_closure, |
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KlassRemSet* klass_rem_set) |
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: _scavenge_closure(scavenge_closure), |
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_accumulate_modified_oops(klass_rem_set->accumulate_modified_oops()) {} |
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DefNewGeneration::DefNewGeneration(ReservedSpace rs, |
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size_t initial_size, |
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const char* policy) |
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: Generation(rs, initial_size), |
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_promo_failure_drain_in_progress(false), |
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_should_allocate_from_space(false) |
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{ |
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MemRegion cmr((HeapWord*)_virtual_space.low(), |
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(HeapWord*)_virtual_space.high()); |
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GenCollectedHeap* gch = GenCollectedHeap::heap(); |
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gch->barrier_set()->resize_covered_region(cmr); |
1 | 195 |
|
27625 | 196 |
_eden_space = new ContiguousSpace(); |
1 | 197 |
_from_space = new ContiguousSpace(); |
198 |
_to_space = new ContiguousSpace(); |
|
199 |
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if (_eden_space == NULL || _from_space == NULL || _to_space == NULL) { |
1 | 201 |
vm_exit_during_initialization("Could not allocate a new gen space"); |
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} |
1 | 203 |
|
204 |
// Compute the maximum eden and survivor space sizes. These sizes |
|
205 |
// are computed assuming the entire reserved space is committed. |
|
206 |
// These values are exported as performance counters. |
|
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uintx alignment = gch->collector_policy()->space_alignment(); |
1 | 208 |
uintx size = _virtual_space.reserved_size(); |
209 |
_max_survivor_size = compute_survivor_size(size, alignment); |
|
210 |
_max_eden_size = size - (2*_max_survivor_size); |
|
211 |
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212 |
// allocate the performance counters |
|
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GenCollectorPolicy* gcp = gch->gen_policy(); |
1 | 214 |
|
215 |
// Generation counters -- generation 0, 3 subspaces |
|
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_gen_counters = new GenerationCounters("new", 0, 3, |
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|
217 |
gcp->min_young_size(), gcp->max_young_size(), &_virtual_space); |
1 | 218 |
_gc_counters = new CollectorCounters(policy, 0); |
219 |
||
220 |
_eden_counters = new CSpaceCounters("eden", 0, _max_eden_size, _eden_space, |
|
221 |
_gen_counters); |
|
222 |
_from_counters = new CSpaceCounters("s0", 1, _max_survivor_size, _from_space, |
|
223 |
_gen_counters); |
|
224 |
_to_counters = new CSpaceCounters("s1", 2, _max_survivor_size, _to_space, |
|
225 |
_gen_counters); |
|
226 |
||
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|
227 |
compute_space_boundaries(0, SpaceDecorator::Clear, SpaceDecorator::Mangle); |
1 | 228 |
update_counters(); |
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|
229 |
_old_gen = NULL; |
1 | 230 |
_tenuring_threshold = MaxTenuringThreshold; |
231 |
_pretenure_size_threshold_words = PretenureSizeThreshold >> LogHeapWordSize; |
|
18025 | 232 |
|
233 |
_gc_timer = new (ResourceObj::C_HEAP, mtGC) STWGCTimer(); |
|
1 | 234 |
} |
235 |
||
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|
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void DefNewGeneration::compute_space_boundaries(uintx minimum_eden_size, |
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bool clear_space, |
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bool mangle_space) { |
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|
239 |
uintx alignment = |
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|
240 |
GenCollectedHeap::heap()->collector_policy()->space_alignment(); |
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|
241 |
|
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|
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// If the spaces are being cleared (only done at heap initialization |
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|
243 |
// currently), the survivor spaces need not be empty. |
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|
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// Otherwise, no care is taken for used areas in the survivor spaces |
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|
245 |
// so check. |
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|
246 |
assert(clear_space || (to()->is_empty() && from()->is_empty()), |
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|
247 |
"Initialization of the survivor spaces assumes these are empty"); |
1 | 248 |
|
249 |
// Compute sizes |
|
250 |
uintx size = _virtual_space.committed_size(); |
|
251 |
uintx survivor_size = compute_survivor_size(size, alignment); |
|
252 |
uintx eden_size = size - (2*survivor_size); |
|
253 |
assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); |
|
254 |
||
255 |
if (eden_size < minimum_eden_size) { |
|
256 |
// May happen due to 64Kb rounding, if so adjust eden size back up |
|
257 |
minimum_eden_size = align_size_up(minimum_eden_size, alignment); |
|
258 |
uintx maximum_survivor_size = (size - minimum_eden_size) / 2; |
|
259 |
uintx unaligned_survivor_size = |
|
260 |
align_size_down(maximum_survivor_size, alignment); |
|
261 |
survivor_size = MAX2(unaligned_survivor_size, alignment); |
|
262 |
eden_size = size - (2*survivor_size); |
|
263 |
assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); |
|
264 |
assert(eden_size >= minimum_eden_size, "just checking"); |
|
265 |
} |
|
266 |
||
267 |
char *eden_start = _virtual_space.low(); |
|
268 |
char *from_start = eden_start + eden_size; |
|
269 |
char *to_start = from_start + survivor_size; |
|
270 |
char *to_end = to_start + survivor_size; |
|
271 |
||
272 |
assert(to_end == _virtual_space.high(), "just checking"); |
|
273 |
assert(Space::is_aligned((HeapWord*)eden_start), "checking alignment"); |
|
274 |
assert(Space::is_aligned((HeapWord*)from_start), "checking alignment"); |
|
275 |
assert(Space::is_aligned((HeapWord*)to_start), "checking alignment"); |
|
276 |
||
277 |
MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)from_start); |
|
278 |
MemRegion fromMR((HeapWord*)from_start, (HeapWord*)to_start); |
|
279 |
MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); |
|
280 |
||
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|
281 |
// A minimum eden size implies that there is a part of eden that |
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|
282 |
// is being used and that affects the initialization of any |
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|
283 |
// newly formed eden. |
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|
284 |
bool live_in_eden = minimum_eden_size > 0; |
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|
285 |
|
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|
286 |
// If not clearing the spaces, do some checking to verify that |
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|
287 |
// the space are already mangled. |
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|
288 |
if (!clear_space) { |
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|
289 |
// Must check mangling before the spaces are reshaped. Otherwise, |
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|
290 |
// the bottom or end of one space may have moved into another |
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|
291 |
// a failure of the check may not correctly indicate which space |
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|
292 |
// is not properly mangled. |
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|
293 |
if (ZapUnusedHeapArea) { |
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|
294 |
HeapWord* limit = (HeapWord*) _virtual_space.high(); |
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|
295 |
eden()->check_mangled_unused_area(limit); |
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|
296 |
from()->check_mangled_unused_area(limit); |
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|
297 |
to()->check_mangled_unused_area(limit); |
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|
298 |
} |
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|
299 |
} |
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|
300 |
|
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|
301 |
// Reset the spaces for their new regions. |
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|
302 |
eden()->initialize(edenMR, |
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|
303 |
clear_space && !live_in_eden, |
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|
304 |
SpaceDecorator::Mangle); |
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changeset
|
305 |
// If clear_space and live_in_eden, we will not have cleared any |
1 | 306 |
// portion of eden above its top. This can cause newly |
307 |
// expanded space not to be mangled if using ZapUnusedHeapArea. |
|
308 |
// We explicitly do such mangling here. |
|
971
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|
309 |
if (ZapUnusedHeapArea && clear_space && live_in_eden && mangle_space) { |
1 | 310 |
eden()->mangle_unused_area(); |
311 |
} |
|
971
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|
312 |
from()->initialize(fromMR, clear_space, mangle_space); |
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|
313 |
to()->initialize(toMR, clear_space, mangle_space); |
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|
314 |
|
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|
315 |
// Set next compaction spaces. |
1 | 316 |
eden()->set_next_compaction_space(from()); |
317 |
// The to-space is normally empty before a compaction so need |
|
318 |
// not be considered. The exception is during promotion |
|
319 |
// failure handling when to-space can contain live objects. |
|
320 |
from()->set_next_compaction_space(NULL); |
|
321 |
} |
|
322 |
||
323 |
void DefNewGeneration::swap_spaces() { |
|
324 |
ContiguousSpace* s = from(); |
|
325 |
_from_space = to(); |
|
326 |
_to_space = s; |
|
327 |
eden()->set_next_compaction_space(from()); |
|
328 |
// The to-space is normally empty before a compaction so need |
|
329 |
// not be considered. The exception is during promotion |
|
330 |
// failure handling when to-space can contain live objects. |
|
331 |
from()->set_next_compaction_space(NULL); |
|
332 |
||
333 |
if (UsePerfData) { |
|
334 |
CSpaceCounters* c = _from_counters; |
|
335 |
_from_counters = _to_counters; |
|
336 |
_to_counters = c; |
|
337 |
} |
|
338 |
} |
|
339 |
||
340 |
bool DefNewGeneration::expand(size_t bytes) { |
|
341 |
MutexLocker x(ExpandHeap_lock); |
|
971
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|
342 |
HeapWord* prev_high = (HeapWord*) _virtual_space.high(); |
1 | 343 |
bool success = _virtual_space.expand_by(bytes); |
971
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|
344 |
if (success && ZapUnusedHeapArea) { |
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|
345 |
// Mangle newly committed space immediately because it |
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|
346 |
// can be done here more simply that after the new |
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|
347 |
// spaces have been computed. |
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|
348 |
HeapWord* new_high = (HeapWord*) _virtual_space.high(); |
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|
349 |
MemRegion mangle_region(prev_high, new_high); |
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|
350 |
SpaceMangler::mangle_region(mangle_region); |
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|
351 |
} |
1 | 352 |
|
353 |
// Do not attempt an expand-to-the reserve size. The |
|
354 |
// request should properly observe the maximum size of |
|
355 |
// the generation so an expand-to-reserve should be |
|
356 |
// unnecessary. Also a second call to expand-to-reserve |
|
357 |
// value potentially can cause an undue expansion. |
|
358 |
// For example if the first expand fail for unknown reasons, |
|
359 |
// but the second succeeds and expands the heap to its maximum |
|
360 |
// value. |
|
35492
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8146690: Make all classes in GC follow the naming convention.
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|
361 |
if (GCLocker::is_active()) { |
35061 | 362 |
log_debug(gc)("Garbage collection disabled, expanded heap instead"); |
1 | 363 |
} |
364 |
||
365 |
return success; |
|
366 |
} |
|
367 |
||
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|
368 |
size_t DefNewGeneration::adjust_for_thread_increase(size_t new_size_candidate, |
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|
369 |
size_t new_size_before, |
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|
370 |
size_t alignment) const { |
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|
371 |
size_t desired_new_size = new_size_before; |
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|
372 |
|
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|
373 |
if (NewSizeThreadIncrease > 0) { |
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|
374 |
int threads_count; |
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|
375 |
size_t thread_increase_size = 0; |
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|
376 |
|
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|
377 |
// 1. Check an overflow at 'threads_count * NewSizeThreadIncrease'. |
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|
378 |
threads_count = Threads::number_of_non_daemon_threads(); |
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|
379 |
if (threads_count > 0 && NewSizeThreadIncrease <= max_uintx / threads_count) { |
35458
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|
380 |
thread_increase_size = threads_count * NewSizeThreadIncrease; |
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|
381 |
|
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|
382 |
// 2. Check an overflow at 'new_size_candidate + thread_increase_size'. |
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|
383 |
if (new_size_candidate <= max_uintx - thread_increase_size) { |
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|
384 |
new_size_candidate += thread_increase_size; |
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|
385 |
|
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|
386 |
// 3. Check an overflow at 'align_size_up'. |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
387 |
size_t aligned_max = ((max_uintx - alignment) & ~(alignment-1)); |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
388 |
if (new_size_candidate <= aligned_max) { |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
389 |
desired_new_size = align_size_up(new_size_candidate, alignment); |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
390 |
} |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
391 |
} |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
392 |
} |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
393 |
} |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
394 |
|
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
395 |
return desired_new_size; |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
396 |
} |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
397 |
|
1 | 398 |
void DefNewGeneration::compute_new_size() { |
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
399 |
// This is called after a GC that includes the old generation, so from-space |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
400 |
// will normally be empty. |
1 | 401 |
// Note that we check both spaces, since if scavenge failed they revert roles. |
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
402 |
// If not we bail out (otherwise we would have to relocate the objects). |
1 | 403 |
if (!from()->is_empty() || !to()->is_empty()) { |
404 |
return; |
|
405 |
} |
|
406 |
||
407 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
408 |
||
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
409 |
size_t old_size = gch->old_gen()->capacity(); |
1 | 410 |
size_t new_size_before = _virtual_space.committed_size(); |
33580 | 411 |
size_t min_new_size = initial_size(); |
1 | 412 |
size_t max_new_size = reserved().byte_size(); |
413 |
assert(min_new_size <= new_size_before && |
|
414 |
new_size_before <= max_new_size, |
|
415 |
"just checking"); |
|
416 |
// All space sizes must be multiples of Generation::GenGrain. |
|
417 |
size_t alignment = Generation::GenGrain; |
|
418 |
||
35458
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
419 |
int threads_count = 0; |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
420 |
size_t thread_increase_size = 0; |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
421 |
|
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
422 |
size_t new_size_candidate = old_size / NewRatio; |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
423 |
// Compute desired new generation size based on NewRatio and NewSizeThreadIncrease |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
424 |
// and reverts to previous value if any overflow happens |
71a08884be5f
8144527: NewSizeThreadIncrease would make an overflow
sangheki
parents:
35061
diff
changeset
|
425 |
size_t desired_new_size = adjust_for_thread_increase(new_size_candidate, new_size_before, alignment); |
1 | 426 |
|
427 |
// Adjust new generation size |
|
428 |
desired_new_size = MAX2(MIN2(desired_new_size, max_new_size), min_new_size); |
|
429 |
assert(desired_new_size <= max_new_size, "just checking"); |
|
430 |
||
431 |
bool changed = false; |
|
432 |
if (desired_new_size > new_size_before) { |
|
433 |
size_t change = desired_new_size - new_size_before; |
|
434 |
assert(change % alignment == 0, "just checking"); |
|
435 |
if (expand(change)) { |
|
436 |
changed = true; |
|
437 |
} |
|
438 |
// If the heap failed to expand to the desired size, |
|
439 |
// "changed" will be false. If the expansion failed |
|
440 |
// (and at this point it was expected to succeed), |
|
441 |
// ignore the failure (leaving "changed" as false). |
|
442 |
} |
|
443 |
if (desired_new_size < new_size_before && eden()->is_empty()) { |
|
444 |
// bail out of shrinking if objects in eden |
|
445 |
size_t change = new_size_before - desired_new_size; |
|
446 |
assert(change % alignment == 0, "just checking"); |
|
447 |
_virtual_space.shrink_by(change); |
|
448 |
changed = true; |
|
449 |
} |
|
450 |
if (changed) { |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
451 |
// The spaces have already been mangled at this point but |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
452 |
// may not have been cleared (set top = bottom) and should be. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
453 |
// Mangling was done when the heap was being expanded. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
454 |
compute_space_boundaries(eden()->used(), |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
455 |
SpaceDecorator::Clear, |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
456 |
SpaceDecorator::DontMangle); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
457 |
MemRegion cmr((HeapWord*)_virtual_space.low(), |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
458 |
(HeapWord*)_virtual_space.high()); |
30173
13cf7580b000
8077413: Avoid use of Universe::heap() inside collectors
pliden
parents:
30155
diff
changeset
|
459 |
gch->barrier_set()->resize_covered_region(cmr); |
35061 | 460 |
|
461 |
log_debug(gc, heap, ergo)( |
|
462 |
"New generation size " SIZE_FORMAT "K->" SIZE_FORMAT "K [eden=" SIZE_FORMAT "K,survivor=" SIZE_FORMAT "K]", |
|
463 |
new_size_before/K, _virtual_space.committed_size()/K, |
|
464 |
eden()->capacity()/K, from()->capacity()/K); |
|
465 |
log_trace(gc, heap, ergo)( |
|
466 |
" [allowed " SIZE_FORMAT "K extra for %d threads]", |
|
1 | 467 |
thread_increase_size/K, threads_count); |
468 |
} |
|
469 |
} |
|
470 |
||
30870
3050fdcdc60b
8080112: Replace and remove the last usages of CollectedHeap::n_par_threads()
stefank
parents:
30868
diff
changeset
|
471 |
void DefNewGeneration::younger_refs_iterate(OopsInGenClosure* cl, uint n_threads) { |
1 | 472 |
assert(false, "NYI -- are you sure you want to call this?"); |
473 |
} |
|
474 |
||
475 |
||
476 |
size_t DefNewGeneration::capacity() const { |
|
477 |
return eden()->capacity() |
|
478 |
+ from()->capacity(); // to() is only used during scavenge |
|
479 |
} |
|
480 |
||
481 |
||
482 |
size_t DefNewGeneration::used() const { |
|
483 |
return eden()->used() |
|
484 |
+ from()->used(); // to() is only used during scavenge |
|
485 |
} |
|
486 |
||
487 |
||
488 |
size_t DefNewGeneration::free() const { |
|
489 |
return eden()->free() |
|
490 |
+ from()->free(); // to() is only used during scavenge |
|
491 |
} |
|
492 |
||
493 |
size_t DefNewGeneration::max_capacity() const { |
|
21561
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
19286
diff
changeset
|
494 |
const size_t alignment = GenCollectedHeap::heap()->collector_policy()->space_alignment(); |
1 | 495 |
const size_t reserved_bytes = reserved().byte_size(); |
496 |
return reserved_bytes - compute_survivor_size(reserved_bytes, alignment); |
|
497 |
} |
|
498 |
||
499 |
size_t DefNewGeneration::unsafe_max_alloc_nogc() const { |
|
500 |
return eden()->free(); |
|
501 |
} |
|
502 |
||
503 |
size_t DefNewGeneration::capacity_before_gc() const { |
|
504 |
return eden()->capacity(); |
|
505 |
} |
|
506 |
||
507 |
size_t DefNewGeneration::contiguous_available() const { |
|
508 |
return eden()->free(); |
|
509 |
} |
|
510 |
||
511 |
||
512 |
HeapWord** DefNewGeneration::top_addr() const { return eden()->top_addr(); } |
|
513 |
HeapWord** DefNewGeneration::end_addr() const { return eden()->end_addr(); } |
|
514 |
||
515 |
void DefNewGeneration::object_iterate(ObjectClosure* blk) { |
|
516 |
eden()->object_iterate(blk); |
|
517 |
from()->object_iterate(blk); |
|
518 |
} |
|
519 |
||
520 |
||
521 |
void DefNewGeneration::space_iterate(SpaceClosure* blk, |
|
522 |
bool usedOnly) { |
|
523 |
blk->do_space(eden()); |
|
524 |
blk->do_space(from()); |
|
525 |
blk->do_space(to()); |
|
526 |
} |
|
527 |
||
528 |
// The last collection bailed out, we are running out of heap space, |
|
529 |
// so we try to allocate the from-space, too. |
|
530 |
HeapWord* DefNewGeneration::allocate_from_space(size_t size) { |
|
35492
c8c0273e6b91
8146690: Make all classes in GC follow the naming convention.
david
parents:
35471
diff
changeset
|
531 |
bool should_try_alloc = should_allocate_from_space() || GCLocker::is_active_and_needs_gc(); |
35061 | 532 |
|
533 |
// If the Heap_lock is not locked by this thread, this will be called |
|
534 |
// again later with the Heap_lock held. |
|
535 |
bool do_alloc = should_try_alloc && (Heap_lock->owned_by_self() || (SafepointSynchronize::is_at_safepoint() && Thread::current()->is_VM_thread())); |
|
536 |
||
1 | 537 |
HeapWord* result = NULL; |
35061 | 538 |
if (do_alloc) { |
539 |
result = from()->allocate(size); |
|
540 |
} |
|
541 |
||
542 |
log_trace(gc, alloc)("DefNewGeneration::allocate_from_space(" SIZE_FORMAT "): will_fail: %s heap_lock: %s free: " SIZE_FORMAT "%s%s returns %s", |
|
7419
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
543 |
size, |
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
544 |
GenCollectedHeap::heap()->incremental_collection_will_fail(false /* don't consult_young */) ? |
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
545 |
"true" : "false", |
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
546 |
Heap_lock->is_locked() ? "locked" : "unlocked", |
35061 | 547 |
from()->free(), |
548 |
should_try_alloc ? "" : " should_allocate_from_space: NOT", |
|
549 |
do_alloc ? " Heap_lock is not owned by self" : "", |
|
550 |
result == NULL ? "NULL" : "object"); |
|
551 |
||
1 | 552 |
return result; |
553 |
} |
|
554 |
||
555 |
HeapWord* DefNewGeneration::expand_and_allocate(size_t size, |
|
556 |
bool is_tlab, |
|
557 |
bool parallel) { |
|
558 |
// We don't attempt to expand the young generation (but perhaps we should.) |
|
559 |
return allocate(size, is_tlab); |
|
560 |
} |
|
561 |
||
15215
048f775ae371
8005972: ParNew should not update the tenuring threshold when promotion failed has occurred
brutisso
parents:
14583
diff
changeset
|
562 |
void DefNewGeneration::adjust_desired_tenuring_threshold() { |
048f775ae371
8005972: ParNew should not update the tenuring threshold when promotion failed has occurred
brutisso
parents:
14583
diff
changeset
|
563 |
// Set the desired survivor size to half the real survivor space |
30147
af9a41999c6e
8076314: Remove the static instance variable SharedHeap:: _sh
brutisso
parents:
29800
diff
changeset
|
564 |
GCPolicyCounters* gc_counters = GenCollectedHeap::heap()->collector_policy()->counters(); |
15215
048f775ae371
8005972: ParNew should not update the tenuring threshold when promotion failed has occurred
brutisso
parents:
14583
diff
changeset
|
565 |
_tenuring_threshold = |
30147
af9a41999c6e
8076314: Remove the static instance variable SharedHeap:: _sh
brutisso
parents:
29800
diff
changeset
|
566 |
age_table()->compute_tenuring_threshold(to()->capacity()/HeapWordSize, gc_counters); |
15215
048f775ae371
8005972: ParNew should not update the tenuring threshold when promotion failed has occurred
brutisso
parents:
14583
diff
changeset
|
567 |
} |
1 | 568 |
|
569 |
void DefNewGeneration::collect(bool full, |
|
570 |
bool clear_all_soft_refs, |
|
571 |
size_t size, |
|
572 |
bool is_tlab) { |
|
573 |
assert(full || size > 0, "otherwise we don't want to collect"); |
|
18025 | 574 |
|
1 | 575 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
18025 | 576 |
|
21767
41eaa9a17059
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
21561
diff
changeset
|
577 |
_gc_timer->register_gc_start(); |
18025 | 578 |
DefNewTracer gc_tracer; |
579 |
gc_tracer.report_gc_start(gch->gc_cause(), _gc_timer->gc_start()); |
|
580 |
||
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
581 |
_old_gen = gch->old_gen(); |
1 | 582 |
|
18025 | 583 |
// If the next generation is too full to accommodate promotion |
1 | 584 |
// from this generation, pass on collection; let the next generation |
585 |
// do it. |
|
586 |
if (!collection_attempt_is_safe()) { |
|
35061 | 587 |
log_trace(gc)(":: Collection attempt not safe ::"); |
6985
e9364ec299ac
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
6762
diff
changeset
|
588 |
gch->set_incremental_collection_failed(); // Slight lie: we did not even attempt one |
1 | 589 |
return; |
590 |
} |
|
591 |
assert(to()->is_empty(), "Else not collection_attempt_is_safe"); |
|
592 |
||
593 |
init_assuming_no_promotion_failure(); |
|
594 |
||
35061 | 595 |
GCTraceTime(Trace, gc) tm("DefNew", NULL, gch->gc_cause()); |
1 | 596 |
|
18025 | 597 |
gch->trace_heap_before_gc(&gc_tracer); |
598 |
||
1 | 599 |
// These can be shared for all code paths |
600 |
IsAliveClosure is_alive(this); |
|
601 |
ScanWeakRefClosure scan_weak_ref(this); |
|
602 |
||
603 |
age_table()->clear(); |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
604 |
to()->clear(SpaceDecorator::Mangle); |
1 | 605 |
|
606 |
gch->rem_set()->prepare_for_younger_refs_iterate(false); |
|
607 |
||
31780 | 608 |
assert(gch->no_allocs_since_save_marks(), |
1 | 609 |
"save marks have not been newly set."); |
610 |
||
611 |
// Not very pretty. |
|
612 |
CollectorPolicy* cp = gch->collector_policy(); |
|
613 |
||
614 |
FastScanClosure fsc_with_no_gc_barrier(this, false); |
|
615 |
FastScanClosure fsc_with_gc_barrier(this, true); |
|
616 |
||
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
617 |
KlassScanClosure klass_scan_closure(&fsc_with_no_gc_barrier, |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
618 |
gch->rem_set()->klass_rem_set()); |
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
619 |
CLDToKlassAndOopClosure cld_scan_closure(&klass_scan_closure, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
620 |
&fsc_with_no_gc_barrier, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
621 |
false); |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
622 |
|
1 | 623 |
set_promo_failure_scan_stack_closure(&fsc_with_no_gc_barrier); |
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
624 |
FastEvacuateFollowersClosure evacuate_followers(gch, |
1 | 625 |
&fsc_with_no_gc_barrier, |
626 |
&fsc_with_gc_barrier); |
|
627 |
||
31780 | 628 |
assert(gch->no_allocs_since_save_marks(), |
1 | 629 |
"save marks have not been newly set."); |
630 |
||
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
631 |
{ |
30871 | 632 |
// DefNew needs to run with n_threads == 0, to make sure the serial |
633 |
// version of the card table scanning code is used. |
|
31964 | 634 |
// See: CardTableModRefBSForCTRS::non_clean_card_iterate_possibly_parallel. |
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
635 |
StrongRootsScope srs(0); |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
636 |
|
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
637 |
gch->gen_process_roots(&srs, |
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
638 |
GenCollectedHeap::YoungGen, |
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
639 |
true, // Process younger gens, if any, |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
640 |
// as strong roots. |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
641 |
GenCollectedHeap::SO_ScavengeCodeCache, |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
642 |
GenCollectedHeap::StrongAndWeakRoots, |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
643 |
&fsc_with_no_gc_barrier, |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
644 |
&fsc_with_gc_barrier, |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
645 |
&cld_scan_closure); |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
646 |
} |
1 | 647 |
|
648 |
// "evacuate followers". |
|
649 |
evacuate_followers.do_void(); |
|
650 |
||
651 |
FastKeepAliveClosure keep_alive(this, &scan_weak_ref); |
|
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1388
diff
changeset
|
652 |
ReferenceProcessor* rp = ref_processor(); |
1610
5dddd195cc86
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
1606
diff
changeset
|
653 |
rp->setup_policy(clear_all_soft_refs); |
18025 | 654 |
const ReferenceProcessorStats& stats = |
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1388
diff
changeset
|
655 |
rp->process_discovered_references(&is_alive, &keep_alive, &evacuate_followers, |
33107
77bf0d2069a3
8134953: Make the GC ID available in a central place
brutisso
parents:
32735
diff
changeset
|
656 |
NULL, _gc_timer); |
18025 | 657 |
gc_tracer.report_gc_reference_stats(stats); |
33143
2083f82acec8
8139134: Wrong tenuring threshold in young GC trace event
ehelin
parents:
33107
diff
changeset
|
658 |
gc_tracer.report_tenuring_threshold(tenuring_threshold()); |
18025 | 659 |
|
660 |
if (!_promotion_failed) { |
|
1 | 661 |
// Swap the survivor spaces. |
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
662 |
eden()->clear(SpaceDecorator::Mangle); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
663 |
from()->clear(SpaceDecorator::Mangle); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
664 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
665 |
// This is now done here because of the piece-meal mangling which |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
666 |
// can check for valid mangling at intermediate points in the |
32623
390a27af5657
8134626: Misc cleanups after generation array removal
jwilhelm
parents:
31964
diff
changeset
|
667 |
// collection(s). When a young collection fails to collect |
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
668 |
// sufficient space resizing of the young generation can occur |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
669 |
// an redistribute the spaces in the young generation. Mangle |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
670 |
// here so that unzapped regions don't get distributed to |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
671 |
// other spaces. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
672 |
to()->mangle_unused_area(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
673 |
} |
1 | 674 |
swap_spaces(); |
675 |
||
676 |
assert(to()->is_empty(), "to space should be empty now"); |
|
677 |
||
15215
048f775ae371
8005972: ParNew should not update the tenuring threshold when promotion failed has occurred
brutisso
parents:
14583
diff
changeset
|
678 |
adjust_desired_tenuring_threshold(); |
1 | 679 |
|
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4574
diff
changeset
|
680 |
// A successful scavenge should restart the GC time limit count which is |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4574
diff
changeset
|
681 |
// for full GC's. |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4574
diff
changeset
|
682 |
AdaptiveSizePolicy* size_policy = gch->gen_policy()->size_policy(); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4574
diff
changeset
|
683 |
size_policy->reset_gc_overhead_limit_count(); |
6985
e9364ec299ac
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
6762
diff
changeset
|
684 |
assert(!gch->incremental_collection_failed(), "Should be clear"); |
1 | 685 |
} else { |
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
686 |
assert(_promo_failure_scan_stack.is_empty(), "post condition"); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
687 |
_promo_failure_scan_stack.clear(true); // Clear cached segments. |
1 | 688 |
|
689 |
remove_forwarding_pointers(); |
|
35061 | 690 |
log_debug(gc)("Promotion failed"); |
1 | 691 |
// Add to-space to the list of space to compact |
692 |
// when a promotion failure has occurred. In that |
|
693 |
// case there can be live objects in to-space |
|
694 |
// as a result of a partial evacuation of eden |
|
695 |
// and from-space. |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
696 |
swap_spaces(); // For uniformity wrt ParNewGeneration. |
1 | 697 |
from()->set_next_compaction_space(to()); |
6985
e9364ec299ac
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
6762
diff
changeset
|
698 |
gch->set_incremental_collection_failed(); |
1 | 699 |
|
4574
b2d5b0975515
6631166: CMS: better heuristics when combatting fragmentation
ysr
parents:
3908
diff
changeset
|
700 |
// Inform the next generation that a promotion failure occurred. |
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
701 |
_old_gen->promotion_failure_occurred(); |
18025 | 702 |
gc_tracer.report_promotion_failed(_promotion_failed_info); |
4574
b2d5b0975515
6631166: CMS: better heuristics when combatting fragmentation
ysr
parents:
3908
diff
changeset
|
703 |
|
1 | 704 |
// Reset the PromotionFailureALot counters. |
30173
13cf7580b000
8077413: Avoid use of Universe::heap() inside collectors
pliden
parents:
30155
diff
changeset
|
705 |
NOT_PRODUCT(gch->reset_promotion_should_fail();) |
1 | 706 |
} |
707 |
// set new iteration safe limit for the survivor spaces |
|
708 |
from()->set_concurrent_iteration_safe_limit(from()->top()); |
|
709 |
to()->set_concurrent_iteration_safe_limit(to()->top()); |
|
11755 | 710 |
|
18025 | 711 |
// We need to use a monotonically non-decreasing time in ms |
11755 | 712 |
// or we will see time-warp warnings and os::javaTimeMillis() |
713 |
// does not guarantee monotonicity. |
|
714 |
jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
|
715 |
update_time_of_last_gc(now); |
|
18025 | 716 |
|
717 |
gch->trace_heap_after_gc(&gc_tracer); |
|
718 |
||
21767
41eaa9a17059
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
21561
diff
changeset
|
719 |
_gc_timer->register_gc_end(); |
18025 | 720 |
|
721 |
gc_tracer.report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions()); |
|
1 | 722 |
} |
723 |
||
724 |
class RemoveForwardPointerClosure: public ObjectClosure { |
|
725 |
public: |
|
726 |
void do_object(oop obj) { |
|
727 |
obj->init_mark(); |
|
728 |
} |
|
729 |
}; |
|
730 |
||
731 |
void DefNewGeneration::init_assuming_no_promotion_failure() { |
|
732 |
_promotion_failed = false; |
|
18025 | 733 |
_promotion_failed_info.reset(); |
1 | 734 |
from()->set_next_compaction_space(NULL); |
735 |
} |
|
736 |
||
737 |
void DefNewGeneration::remove_forwarding_pointers() { |
|
738 |
RemoveForwardPointerClosure rspc; |
|
739 |
eden()->object_iterate(&rspc); |
|
740 |
from()->object_iterate(&rspc); |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
741 |
|
1 | 742 |
// Now restore saved marks, if any. |
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
743 |
assert(_objs_with_preserved_marks.size() == _preserved_marks_of_objs.size(), |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
744 |
"should be the same"); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
745 |
while (!_objs_with_preserved_marks.is_empty()) { |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
746 |
oop obj = _objs_with_preserved_marks.pop(); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
747 |
markOop m = _preserved_marks_of_objs.pop(); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
748 |
obj->set_mark(m); |
1 | 749 |
} |
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
750 |
_objs_with_preserved_marks.clear(true); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
751 |
_preserved_marks_of_objs.clear(true); |
1 | 752 |
} |
753 |
||
7658
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7419
diff
changeset
|
754 |
void DefNewGeneration::preserve_mark(oop obj, markOop m) { |
18025 | 755 |
assert(_promotion_failed && m->must_be_preserved_for_promotion_failure(obj), |
7658
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7419
diff
changeset
|
756 |
"Oversaving!"); |
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7419
diff
changeset
|
757 |
_objs_with_preserved_marks.push(obj); |
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7419
diff
changeset
|
758 |
_preserved_marks_of_objs.push(m); |
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7419
diff
changeset
|
759 |
} |
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7419
diff
changeset
|
760 |
|
1 | 761 |
void DefNewGeneration::preserve_mark_if_necessary(oop obj, markOop m) { |
762 |
if (m->must_be_preserved_for_promotion_failure(obj)) { |
|
7658
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7419
diff
changeset
|
763 |
preserve_mark(obj, m); |
1 | 764 |
} |
765 |
} |
|
766 |
||
767 |
void DefNewGeneration::handle_promotion_failure(oop old) { |
|
35061 | 768 |
log_debug(gc, promotion)("Promotion failure size = %d) ", old->size()); |
769 |
||
7658
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7419
diff
changeset
|
770 |
_promotion_failed = true; |
18025 | 771 |
_promotion_failed_info.register_copy_failure(old->size()); |
7658
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7419
diff
changeset
|
772 |
preserve_mark_if_necessary(old, old->mark()); |
1 | 773 |
// forward to self |
774 |
old->forward_to(old); |
|
775 |
||
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
776 |
_promo_failure_scan_stack.push(old); |
1 | 777 |
|
778 |
if (!_promo_failure_drain_in_progress) { |
|
779 |
// prevent recursion in copy_to_survivor_space() |
|
780 |
_promo_failure_drain_in_progress = true; |
|
781 |
drain_promo_failure_scan_stack(); |
|
782 |
_promo_failure_drain_in_progress = false; |
|
783 |
} |
|
784 |
} |
|
785 |
||
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
786 |
oop DefNewGeneration::copy_to_survivor_space(oop old) { |
1 | 787 |
assert(is_in_reserved(old) && !old->is_forwarded(), |
788 |
"shouldn't be scavenging this oop"); |
|
789 |
size_t s = old->size(); |
|
790 |
oop obj = NULL; |
|
791 |
||
792 |
// Try allocating obj in to-space (unless too old) |
|
793 |
if (old->age() < tenuring_threshold()) { |
|
25905
04a3d83cc752
8031323: Optionally align objects copied to survivor spaces
jmasa
parents:
25492
diff
changeset
|
794 |
obj = (oop) to()->allocate_aligned(s); |
1 | 795 |
} |
796 |
||
797 |
// Otherwise try allocating obj tenured |
|
798 |
if (obj == NULL) { |
|
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
799 |
obj = _old_gen->promote(old, s); |
1 | 800 |
if (obj == NULL) { |
801 |
handle_promotion_failure(old); |
|
802 |
return old; |
|
803 |
} |
|
804 |
} else { |
|
805 |
// Prefetch beyond obj |
|
806 |
const intx interval = PrefetchCopyIntervalInBytes; |
|
807 |
Prefetch::write(obj, interval); |
|
808 |
||
809 |
// Copy obj |
|
810 |
Copy::aligned_disjoint_words((HeapWord*)old, (HeapWord*)obj, s); |
|
811 |
||
812 |
// Increment age if obj still in new generation |
|
813 |
obj->incr_age(); |
|
814 |
age_table()->add(obj, s); |
|
815 |
} |
|
816 |
||
817 |
// Done, insert forward pointer to obj in this header |
|
818 |
old->forward_to(obj); |
|
819 |
||
820 |
return obj; |
|
821 |
} |
|
822 |
||
823 |
void DefNewGeneration::drain_promo_failure_scan_stack() { |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
824 |
while (!_promo_failure_scan_stack.is_empty()) { |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
825 |
oop obj = _promo_failure_scan_stack.pop(); |
1 | 826 |
obj->oop_iterate(_promo_failure_scan_stack_closure); |
827 |
} |
|
828 |
} |
|
829 |
||
830 |
void DefNewGeneration::save_marks() { |
|
831 |
eden()->set_saved_mark(); |
|
832 |
to()->set_saved_mark(); |
|
833 |
from()->set_saved_mark(); |
|
834 |
} |
|
835 |
||
836 |
||
837 |
void DefNewGeneration::reset_saved_marks() { |
|
838 |
eden()->reset_saved_mark(); |
|
839 |
to()->reset_saved_mark(); |
|
840 |
from()->reset_saved_mark(); |
|
841 |
} |
|
842 |
||
843 |
||
844 |
bool DefNewGeneration::no_allocs_since_save_marks() { |
|
845 |
assert(eden()->saved_mark_at_top(), "Violated spec - alloc in eden"); |
|
846 |
assert(from()->saved_mark_at_top(), "Violated spec - alloc in from"); |
|
847 |
return to()->saved_mark_at_top(); |
|
848 |
} |
|
849 |
||
850 |
#define DefNew_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ |
|
851 |
\ |
|
852 |
void DefNewGeneration:: \ |
|
853 |
oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ |
|
854 |
cl->set_generation(this); \ |
|
855 |
eden()->oop_since_save_marks_iterate##nv_suffix(cl); \ |
|
856 |
to()->oop_since_save_marks_iterate##nv_suffix(cl); \ |
|
857 |
from()->oop_since_save_marks_iterate##nv_suffix(cl); \ |
|
858 |
cl->reset_generation(); \ |
|
859 |
save_marks(); \ |
|
860 |
} |
|
861 |
||
862 |
ALL_SINCE_SAVE_MARKS_CLOSURES(DefNew_SINCE_SAVE_MARKS_DEFN) |
|
863 |
||
864 |
#undef DefNew_SINCE_SAVE_MARKS_DEFN |
|
865 |
||
866 |
void DefNewGeneration::contribute_scratch(ScratchBlock*& list, Generation* requestor, |
|
867 |
size_t max_alloc_words) { |
|
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
868 |
if (requestor == this || _promotion_failed) { |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
869 |
return; |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
870 |
} |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
871 |
assert(GenCollectedHeap::heap()->is_old_gen(requestor), "We should not call our own generation"); |
1 | 872 |
|
873 |
/* $$$ Assert this? "trace" is a "MarkSweep" function so that's not appropriate. |
|
874 |
if (to_space->top() > to_space->bottom()) { |
|
875 |
trace("to_space not empty when contribute_scratch called"); |
|
876 |
} |
|
877 |
*/ |
|
878 |
||
879 |
ContiguousSpace* to_space = to(); |
|
880 |
assert(to_space->end() >= to_space->top(), "pointers out of order"); |
|
881 |
size_t free_words = pointer_delta(to_space->end(), to_space->top()); |
|
882 |
if (free_words >= MinFreeScratchWords) { |
|
883 |
ScratchBlock* sb = (ScratchBlock*)to_space->top(); |
|
884 |
sb->num_words = free_words; |
|
885 |
sb->next = list; |
|
886 |
list = sb; |
|
887 |
} |
|
888 |
} |
|
889 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
890 |
void DefNewGeneration::reset_scratch() { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
891 |
// If contributing scratch in to_space, mangle all of |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
892 |
// to_space if ZapUnusedHeapArea. This is needed because |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
893 |
// top is not maintained while using to-space as scratch. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
894 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
895 |
to()->mangle_unused_area_complete(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
896 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
897 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
898 |
|
1 | 899 |
bool DefNewGeneration::collection_attempt_is_safe() { |
900 |
if (!to()->is_empty()) { |
|
35061 | 901 |
log_trace(gc)(":: to is not empty ::"); |
1 | 902 |
return false; |
903 |
} |
|
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
904 |
if (_old_gen == NULL) { |
1 | 905 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
906 |
_old_gen = gch->old_gen(); |
1 | 907 |
} |
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
908 |
return _old_gen->promotion_attempt_is_safe(used()); |
1 | 909 |
} |
910 |
||
911 |
void DefNewGeneration::gc_epilogue(bool full) { |
|
6986
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
912 |
DEBUG_ONLY(static bool seen_incremental_collection_failed = false;) |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
913 |
|
35492
c8c0273e6b91
8146690: Make all classes in GC follow the naming convention.
david
parents:
35471
diff
changeset
|
914 |
assert(!GCLocker::is_active(), "We should not be executing here"); |
1 | 915 |
// Check if the heap is approaching full after a collection has |
916 |
// been done. Generally the young generation is empty at |
|
917 |
// a minimum at the end of a collection. If it is not, then |
|
918 |
// the heap is approaching full. |
|
919 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
6985
e9364ec299ac
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
6762
diff
changeset
|
920 |
if (full) { |
6986
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
921 |
DEBUG_ONLY(seen_incremental_collection_failed = false;) |
7419
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
922 |
if (!collection_attempt_is_safe() && !_eden_space->is_empty()) { |
35061 | 923 |
log_trace(gc)("DefNewEpilogue: cause(%s), full, not safe, set_failed, set_alloc_from, clear_seen", |
7419
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
924 |
GCCause::to_string(gch->gc_cause())); |
6985
e9364ec299ac
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
6762
diff
changeset
|
925 |
gch->set_incremental_collection_failed(); // Slight lie: a full gc left us in that state |
e9364ec299ac
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
6762
diff
changeset
|
926 |
set_should_allocate_from_space(); // we seem to be running out of space |
e9364ec299ac
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
6762
diff
changeset
|
927 |
} else { |
35061 | 928 |
log_trace(gc)("DefNewEpilogue: cause(%s), full, safe, clear_failed, clear_alloc_from, clear_seen", |
7419
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
929 |
GCCause::to_string(gch->gc_cause())); |
6985
e9364ec299ac
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
6762
diff
changeset
|
930 |
gch->clear_incremental_collection_failed(); // We just did a full collection |
e9364ec299ac
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
6762
diff
changeset
|
931 |
clear_should_allocate_from_space(); // if set |
e9364ec299ac
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
6762
diff
changeset
|
932 |
} |
1 | 933 |
} else { |
6986
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
934 |
#ifdef ASSERT |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
935 |
// It is possible that incremental_collection_failed() == true |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
936 |
// here, because an attempted scavenge did not succeed. The policy |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
937 |
// is normally expected to cause a full collection which should |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
938 |
// clear that condition, so we should not be here twice in a row |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
939 |
// with incremental_collection_failed() == true without having done |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
940 |
// a full collection in between. |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
941 |
if (!seen_incremental_collection_failed && |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
942 |
gch->incremental_collection_failed()) { |
35061 | 943 |
log_trace(gc)("DefNewEpilogue: cause(%s), not full, not_seen_failed, failed, set_seen_failed", |
7419
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
944 |
GCCause::to_string(gch->gc_cause())); |
6986
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
945 |
seen_incremental_collection_failed = true; |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
946 |
} else if (seen_incremental_collection_failed) { |
35061 | 947 |
log_trace(gc)("DefNewEpilogue: cause(%s), not full, seen_failed, will_clear_seen_failed", |
7419
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
948 |
GCCause::to_string(gch->gc_cause())); |
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
949 |
assert(gch->gc_cause() == GCCause::_scavenge_alot || |
31032
8e72621ca186
8072913: [REDO] GCCause should distinguish jcmd GC.run from System.gc()
ysuenaga
parents:
30871
diff
changeset
|
950 |
(GCCause::is_user_requested_gc(gch->gc_cause()) && UseConcMarkSweepGC && ExplicitGCInvokesConcurrent) || |
7419
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
951 |
!gch->incremental_collection_failed(), |
7378
fe845b64d7fb
6998802: ScavengeALot: assert(!gch->incremental_collection_failed()) failed: Twice in a row
ysr
parents:
6986
diff
changeset
|
952 |
"Twice in a row"); |
6986
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
953 |
seen_incremental_collection_failed = false; |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
954 |
} |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
955 |
#endif // ASSERT |
1 | 956 |
} |
957 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
958 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
959 |
eden()->check_mangled_unused_area_complete(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
960 |
from()->check_mangled_unused_area_complete(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
961 |
to()->check_mangled_unused_area_complete(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
962 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
963 |
|
10022
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
7658
diff
changeset
|
964 |
if (!CleanChunkPoolAsync) { |
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
7658
diff
changeset
|
965 |
Chunk::clean_chunk_pool(); |
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
7658
diff
changeset
|
966 |
} |
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
7658
diff
changeset
|
967 |
|
1 | 968 |
// update the generation and space performance counters |
969 |
update_counters(); |
|
970 |
gch->collector_policy()->counters()->update_counters(); |
|
971 |
} |
|
972 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
973 |
void DefNewGeneration::record_spaces_top() { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
974 |
assert(ZapUnusedHeapArea, "Not mangling unused space"); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
975 |
eden()->set_top_for_allocations(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
976 |
to()->set_top_for_allocations(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
977 |
from()->set_top_for_allocations(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
978 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
979 |
|
18025 | 980 |
void DefNewGeneration::ref_processor_init() { |
981 |
Generation::ref_processor_init(); |
|
982 |
} |
|
983 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
984 |
|
1 | 985 |
void DefNewGeneration::update_counters() { |
986 |
if (UsePerfData) { |
|
987 |
_eden_counters->update_all(); |
|
988 |
_from_counters->update_all(); |
|
989 |
_to_counters->update_all(); |
|
990 |
_gen_counters->update_all(); |
|
991 |
} |
|
992 |
} |
|
993 |
||
12379 | 994 |
void DefNewGeneration::verify() { |
995 |
eden()->verify(); |
|
996 |
from()->verify(); |
|
997 |
to()->verify(); |
|
1 | 998 |
} |
999 |
||
1000 |
void DefNewGeneration::print_on(outputStream* st) const { |
|
1001 |
Generation::print_on(st); |
|
1002 |
st->print(" eden"); |
|
1003 |
eden()->print_on(st); |
|
1004 |
st->print(" from"); |
|
1005 |
from()->print_on(st); |
|
1006 |
st->print(" to "); |
|
1007 |
to()->print_on(st); |
|
1008 |
} |
|
1009 |
||
1010 |
||
1011 |
const char* DefNewGeneration::name() const { |
|
1012 |
return "def new generation"; |
|
1013 |
} |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1014 |
|
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1015 |
// Moved from inline file as they are not called inline |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1016 |
CompactibleSpace* DefNewGeneration::first_compaction_space() const { |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1017 |
return eden(); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1018 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1019 |
|
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
1020 |
HeapWord* DefNewGeneration::allocate(size_t word_size, bool is_tlab) { |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1021 |
// This is the slow-path allocation for the DefNewGeneration. |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1022 |
// Most allocations are fast-path in compiled code. |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1023 |
// We try to allocate from the eden. If that works, we are happy. |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1024 |
// Note that since DefNewGeneration supports lock-free allocation, we |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1025 |
// have to use it here, as well. |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1026 |
HeapWord* result = eden()->par_allocate(word_size); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1027 |
if (result != NULL) { |
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
1028 |
if (CMSEdenChunksRecordAlways && _old_gen != NULL) { |
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
1029 |
_old_gen->sample_eden_chunk(); |
18994
d32a17b7502c
6990419: CMS Remaining work for 6572569: consistently skewed work distribution in (long) re-mark pauses
jmasa
parents:
18687
diff
changeset
|
1030 |
} |
27625 | 1031 |
} else { |
1032 |
// If the eden is full and the last collection bailed out, we are running |
|
1033 |
// out of heap space, and we try to allocate the from-space, too. |
|
1034 |
// allocate_from_space can't be inlined because that would introduce a |
|
1035 |
// circular dependency at compile time. |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1036 |
result = allocate_from_space(word_size); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1037 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1038 |
return result; |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1039 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1040 |
|
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1041 |
HeapWord* DefNewGeneration::par_allocate(size_t word_size, |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1042 |
bool is_tlab) { |
18994
d32a17b7502c
6990419: CMS Remaining work for 6572569: consistently skewed work distribution in (long) re-mark pauses
jmasa
parents:
18687
diff
changeset
|
1043 |
HeapWord* res = eden()->par_allocate(word_size); |
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
1044 |
if (CMSEdenChunksRecordAlways && _old_gen != NULL) { |
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
1045 |
_old_gen->sample_eden_chunk(); |
18994
d32a17b7502c
6990419: CMS Remaining work for 6572569: consistently skewed work distribution in (long) re-mark pauses
jmasa
parents:
18687
diff
changeset
|
1046 |
} |
d32a17b7502c
6990419: CMS Remaining work for 6572569: consistently skewed work distribution in (long) re-mark pauses
jmasa
parents:
18687
diff
changeset
|
1047 |
return res; |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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1048 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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|
1049 |
|
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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|
1050 |
size_t DefNewGeneration::tlab_capacity() const { |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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1051 |
return eden()->capacity(); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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|
1052 |
} |
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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1053 |
|
22552 | 1054 |
size_t DefNewGeneration::tlab_used() const { |
1055 |
return eden()->used(); |
|
1056 |
} |
|
1057 |
||
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1058 |
size_t DefNewGeneration::unsafe_max_tlab_alloc() const { |
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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1059 |
return unsafe_max_alloc_nogc(); |
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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1060 |
} |