author | tschatzl |
Fri, 22 Nov 2019 10:03:38 +0100 | |
changeset 59221 | cc3a82fc7bcb |
parent 59053 | ba6c248cae19 |
child 59290 | 97d13893ec3c |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2001, 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 "gc/serial/defNewGeneration.inline.hpp" |
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#include "gc/serial/serialHeap.inline.hpp" |
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#include "gc/serial/tenuredGeneration.hpp" |
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#include "gc/shared/adaptiveSizePolicy.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/gcArguments.hpp" |
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#include "gc/shared/gcHeapSummary.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/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/genOopClosures.inline.hpp" |
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#include "gc/shared/generationSpec.hpp" |
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#include "gc/shared/preservedMarks.inline.hpp" |
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#include "gc/shared/referencePolicy.hpp" |
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#include "gc/shared/referenceProcessorPhaseTimes.hpp" |
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#include "gc/shared/space.inline.hpp" |
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#include "gc/shared/spaceDecorator.inline.hpp" |
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#include "gc/shared/strongRootsScope.hpp" |
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#include "gc/shared/weakProcessor.hpp" |
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#include "logging/log.hpp" |
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#include "memory/iterator.inline.hpp" |
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#include "memory/resourceArea.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.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/align.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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// |
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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::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::FastEvacuateFollowersClosure:: |
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FastEvacuateFollowersClosure(SerialHeap* heap, |
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FastScanClosure* cur, |
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FastScanClosure* older) : |
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_heap(heap), _scan_cur_or_nonheap(cur), _scan_older(older) |
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{ |
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} |
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void DefNewGeneration::FastEvacuateFollowersClosure::do_void() { |
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do { |
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_heap->oop_since_save_marks_iterate(_scan_cur_or_nonheap, _scan_older); |
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} while (!_heap->no_allocs_since_save_marks()); |
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guarantee(_heap->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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OopsInClassLoaderDataOrGenClosure(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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FastScanClosure::FastScanClosure(DefNewGeneration* g, bool gc_barrier) : |
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OopsInClassLoaderDataOrGenClosure(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 CLDScanClosure::do_cld(ClassLoaderData* cld) { |
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NOT_PRODUCT(ResourceMark rm); |
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log_develop_trace(gc, scavenge)("CLDScanClosure::do_cld " PTR_FORMAT ", %s, dirty: %s", |
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p2i(cld), |
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cld->loader_name_and_id(), |
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cld->has_modified_oops() ? "true" : "false"); |
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// If the cld 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 (cld->has_modified_oops()) { |
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if (_accumulate_modified_oops) { |
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cld->accumulate_modified_oops(); |
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} |
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// Tell the closure which CLD 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_cld(cld); |
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// Clean the cld since we're going to scavenge all the metadata. |
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cld->oops_do(_scavenge_closure, ClassLoaderData::_claim_none, /*clear_modified_oops*/true); |
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_scavenge_closure->set_scanned_cld(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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DefNewGeneration::DefNewGeneration(ReservedSpace rs, |
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size_t initial_size, |
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size_t min_size, |
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size_t max_size, |
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const char* policy) |
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: Generation(rs, initial_size), |
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_preserved_marks_set(false /* in_c_heap */), |
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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->rem_set()->resize_covered_region(cmr); |
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_eden_space = new ContiguousSpace(); |
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_from_space = new ContiguousSpace(); |
170 |
_to_space = new ContiguousSpace(); |
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if (_eden_space == NULL || _from_space == NULL || _to_space == NULL) { |
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vm_exit_during_initialization("Could not allocate a new gen space"); |
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} |
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// Compute the maximum eden and survivor space sizes. These sizes |
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// are computed assuming the entire reserved space is committed. |
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// These values are exported as performance counters. |
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uintx size = _virtual_space.reserved_size(); |
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_max_survivor_size = compute_survivor_size(size, SpaceAlignment); |
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_max_eden_size = size - (2*_max_survivor_size); |
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// allocate the performance counters |
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184 |
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// Generation counters -- generation 0, 3 subspaces |
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_gen_counters = new GenerationCounters("new", 0, 3, |
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min_size, max_size, &_virtual_space); |
1 | 188 |
_gc_counters = new CollectorCounters(policy, 0); |
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190 |
_eden_counters = new CSpaceCounters("eden", 0, _max_eden_size, _eden_space, |
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191 |
_gen_counters); |
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192 |
_from_counters = new CSpaceCounters("s0", 1, _max_survivor_size, _from_space, |
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193 |
_gen_counters); |
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194 |
_to_counters = new CSpaceCounters("s1", 2, _max_survivor_size, _to_space, |
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_gen_counters); |
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196 |
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compute_space_boundaries(0, SpaceDecorator::Clear, SpaceDecorator::Mangle); |
1 | 198 |
update_counters(); |
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_old_gen = NULL; |
1 | 200 |
_tenuring_threshold = MaxTenuringThreshold; |
201 |
_pretenure_size_threshold_words = PretenureSizeThreshold >> LogHeapWordSize; |
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_gc_timer = new (ResourceObj::C_HEAP, mtGC) STWGCTimer(); |
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1 | 204 |
} |
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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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// If the spaces are being cleared (only done at heap initialization |
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// currently), the survivor spaces need not be empty. |
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// Otherwise, no care is taken for used areas in the survivor spaces |
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// so check. |
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assert(clear_space || (to()->is_empty() && from()->is_empty()), |
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214 |
"Initialization of the survivor spaces assumes these are empty"); |
1 | 215 |
|
216 |
// Compute sizes |
|
217 |
uintx size = _virtual_space.committed_size(); |
|
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uintx survivor_size = compute_survivor_size(size, SpaceAlignment); |
1 | 219 |
uintx eden_size = size - (2*survivor_size); |
220 |
assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); |
|
221 |
||
222 |
if (eden_size < minimum_eden_size) { |
|
223 |
// May happen due to 64Kb rounding, if so adjust eden size back up |
|
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minimum_eden_size = align_up(minimum_eden_size, SpaceAlignment); |
1 | 225 |
uintx maximum_survivor_size = (size - minimum_eden_size) / 2; |
226 |
uintx unaligned_survivor_size = |
|
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align_down(maximum_survivor_size, SpaceAlignment); |
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survivor_size = MAX2(unaligned_survivor_size, SpaceAlignment); |
1 | 229 |
eden_size = size - (2*survivor_size); |
230 |
assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); |
|
231 |
assert(eden_size >= minimum_eden_size, "just checking"); |
|
232 |
} |
|
233 |
||
234 |
char *eden_start = _virtual_space.low(); |
|
235 |
char *from_start = eden_start + eden_size; |
|
236 |
char *to_start = from_start + survivor_size; |
|
237 |
char *to_end = to_start + survivor_size; |
|
238 |
||
239 |
assert(to_end == _virtual_space.high(), "just checking"); |
|
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assert(Space::is_aligned(eden_start), "checking alignment"); |
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assert(Space::is_aligned(from_start), "checking alignment"); |
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242 |
assert(Space::is_aligned(to_start), "checking alignment"); |
1 | 243 |
|
244 |
MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)from_start); |
|
245 |
MemRegion fromMR((HeapWord*)from_start, (HeapWord*)to_start); |
|
246 |
MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); |
|
247 |
||
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// A minimum eden size implies that there is a part of eden that |
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249 |
// is being used and that affects the initialization of any |
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250 |
// newly formed eden. |
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251 |
bool live_in_eden = minimum_eden_size > 0; |
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|
252 |
|
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|
253 |
// If not clearing the spaces, do some checking to verify that |
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254 |
// the space are already mangled. |
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|
255 |
if (!clear_space) { |
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|
256 |
// Must check mangling before the spaces are reshaped. Otherwise, |
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|
257 |
// the bottom or end of one space may have moved into another |
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|
258 |
// a failure of the check may not correctly indicate which space |
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259 |
// is not properly mangled. |
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|
260 |
if (ZapUnusedHeapArea) { |
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|
261 |
HeapWord* limit = (HeapWord*) _virtual_space.high(); |
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|
262 |
eden()->check_mangled_unused_area(limit); |
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|
263 |
from()->check_mangled_unused_area(limit); |
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|
264 |
to()->check_mangled_unused_area(limit); |
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|
265 |
} |
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|
266 |
} |
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|
267 |
|
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|
268 |
// Reset the spaces for their new regions. |
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|
269 |
eden()->initialize(edenMR, |
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|
270 |
clear_space && !live_in_eden, |
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|
271 |
SpaceDecorator::Mangle); |
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|
272 |
// If clear_space and live_in_eden, we will not have cleared any |
1 | 273 |
// portion of eden above its top. This can cause newly |
274 |
// expanded space not to be mangled if using ZapUnusedHeapArea. |
|
275 |
// We explicitly do such mangling here. |
|
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|
276 |
if (ZapUnusedHeapArea && clear_space && live_in_eden && mangle_space) { |
1 | 277 |
eden()->mangle_unused_area(); |
278 |
} |
|
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|
279 |
from()->initialize(fromMR, clear_space, mangle_space); |
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|
280 |
to()->initialize(toMR, clear_space, mangle_space); |
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|
281 |
|
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|
282 |
// Set next compaction spaces. |
1 | 283 |
eden()->set_next_compaction_space(from()); |
284 |
// The to-space is normally empty before a compaction so need |
|
285 |
// not be considered. The exception is during promotion |
|
286 |
// failure handling when to-space can contain live objects. |
|
287 |
from()->set_next_compaction_space(NULL); |
|
288 |
} |
|
289 |
||
290 |
void DefNewGeneration::swap_spaces() { |
|
291 |
ContiguousSpace* s = from(); |
|
292 |
_from_space = to(); |
|
293 |
_to_space = s; |
|
294 |
eden()->set_next_compaction_space(from()); |
|
295 |
// The to-space is normally empty before a compaction so need |
|
296 |
// not be considered. The exception is during promotion |
|
297 |
// failure handling when to-space can contain live objects. |
|
298 |
from()->set_next_compaction_space(NULL); |
|
299 |
||
300 |
if (UsePerfData) { |
|
301 |
CSpaceCounters* c = _from_counters; |
|
302 |
_from_counters = _to_counters; |
|
303 |
_to_counters = c; |
|
304 |
} |
|
305 |
} |
|
306 |
||
307 |
bool DefNewGeneration::expand(size_t bytes) { |
|
308 |
MutexLocker x(ExpandHeap_lock); |
|
971
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|
309 |
HeapWord* prev_high = (HeapWord*) _virtual_space.high(); |
1 | 310 |
bool success = _virtual_space.expand_by(bytes); |
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|
311 |
if (success && ZapUnusedHeapArea) { |
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|
312 |
// Mangle newly committed space immediately because it |
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|
313 |
// can be done here more simply that after the new |
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|
314 |
// spaces have been computed. |
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|
315 |
HeapWord* new_high = (HeapWord*) _virtual_space.high(); |
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|
316 |
MemRegion mangle_region(prev_high, new_high); |
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|
317 |
SpaceMangler::mangle_region(mangle_region); |
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|
318 |
} |
1 | 319 |
|
320 |
// Do not attempt an expand-to-the reserve size. The |
|
321 |
// request should properly observe the maximum size of |
|
322 |
// the generation so an expand-to-reserve should be |
|
323 |
// unnecessary. Also a second call to expand-to-reserve |
|
324 |
// value potentially can cause an undue expansion. |
|
325 |
// For example if the first expand fail for unknown reasons, |
|
326 |
// but the second succeeds and expands the heap to its maximum |
|
327 |
// value. |
|
35492
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|
328 |
if (GCLocker::is_active()) { |
35061 | 329 |
log_debug(gc)("Garbage collection disabled, expanded heap instead"); |
1 | 330 |
} |
331 |
||
332 |
return success; |
|
333 |
} |
|
334 |
||
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|
335 |
size_t DefNewGeneration::adjust_for_thread_increase(size_t new_size_candidate, |
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|
336 |
size_t new_size_before, |
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|
337 |
size_t alignment) const { |
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|
338 |
size_t desired_new_size = new_size_before; |
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|
339 |
|
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|
340 |
if (NewSizeThreadIncrease > 0) { |
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|
341 |
int threads_count; |
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|
342 |
size_t thread_increase_size = 0; |
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|
343 |
|
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|
344 |
// 1. Check an overflow at 'threads_count * NewSizeThreadIncrease'. |
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|
345 |
threads_count = Threads::number_of_non_daemon_threads(); |
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|
346 |
if (threads_count > 0 && NewSizeThreadIncrease <= max_uintx / threads_count) { |
35458
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|
347 |
thread_increase_size = threads_count * NewSizeThreadIncrease; |
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|
348 |
|
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|
349 |
// 2. Check an overflow at 'new_size_candidate + thread_increase_size'. |
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|
350 |
if (new_size_candidate <= max_uintx - thread_increase_size) { |
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|
351 |
new_size_candidate += thread_increase_size; |
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|
352 |
|
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|
353 |
// 3. Check an overflow at 'align_up'. |
35458
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|
354 |
size_t aligned_max = ((max_uintx - alignment) & ~(alignment-1)); |
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|
355 |
if (new_size_candidate <= aligned_max) { |
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|
356 |
desired_new_size = align_up(new_size_candidate, alignment); |
35458
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|
357 |
} |
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|
358 |
} |
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|
359 |
} |
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|
360 |
} |
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|
361 |
|
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|
362 |
return desired_new_size; |
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|
363 |
} |
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|
364 |
|
1 | 365 |
void DefNewGeneration::compute_new_size() { |
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|
366 |
// This is called after a GC that includes the old generation, so from-space |
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|
367 |
// will normally be empty. |
1 | 368 |
// Note that we check both spaces, since if scavenge failed they revert roles. |
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|
369 |
// If not we bail out (otherwise we would have to relocate the objects). |
1 | 370 |
if (!from()->is_empty() || !to()->is_empty()) { |
371 |
return; |
|
372 |
} |
|
373 |
||
374 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
375 |
||
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|
376 |
size_t old_size = gch->old_gen()->capacity(); |
1 | 377 |
size_t new_size_before = _virtual_space.committed_size(); |
33580 | 378 |
size_t min_new_size = initial_size(); |
1 | 379 |
size_t max_new_size = reserved().byte_size(); |
380 |
assert(min_new_size <= new_size_before && |
|
381 |
new_size_before <= max_new_size, |
|
382 |
"just checking"); |
|
383 |
// All space sizes must be multiples of Generation::GenGrain. |
|
384 |
size_t alignment = Generation::GenGrain; |
|
385 |
||
35458
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|
386 |
int threads_count = 0; |
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|
387 |
size_t thread_increase_size = 0; |
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changeset
|
388 |
|
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|
389 |
size_t new_size_candidate = old_size / NewRatio; |
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|
390 |
// Compute desired new generation size based on NewRatio and NewSizeThreadIncrease |
71a08884be5f
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|
391 |
// and reverts to previous value if any overflow happens |
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|
392 |
size_t desired_new_size = adjust_for_thread_increase(new_size_candidate, new_size_before, alignment); |
1 | 393 |
|
394 |
// Adjust new generation size |
|
59221
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8233702: Introduce helper function to clamp value to range
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changeset
|
395 |
desired_new_size = clamp(desired_new_size, min_new_size, max_new_size); |
1 | 396 |
assert(desired_new_size <= max_new_size, "just checking"); |
397 |
||
398 |
bool changed = false; |
|
399 |
if (desired_new_size > new_size_before) { |
|
400 |
size_t change = desired_new_size - new_size_before; |
|
401 |
assert(change % alignment == 0, "just checking"); |
|
402 |
if (expand(change)) { |
|
403 |
changed = true; |
|
404 |
} |
|
405 |
// If the heap failed to expand to the desired size, |
|
406 |
// "changed" will be false. If the expansion failed |
|
407 |
// (and at this point it was expected to succeed), |
|
408 |
// ignore the failure (leaving "changed" as false). |
|
409 |
} |
|
410 |
if (desired_new_size < new_size_before && eden()->is_empty()) { |
|
411 |
// bail out of shrinking if objects in eden |
|
412 |
size_t change = new_size_before - desired_new_size; |
|
413 |
assert(change % alignment == 0, "just checking"); |
|
414 |
_virtual_space.shrink_by(change); |
|
415 |
changed = true; |
|
416 |
} |
|
417 |
if (changed) { |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
418 |
// 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
|
419 |
// 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
|
420 |
// 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
|
421 |
compute_space_boundaries(eden()->used(), |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
422 |
SpaceDecorator::Clear, |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
423 |
SpaceDecorator::DontMangle); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
424 |
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
|
425 |
(HeapWord*)_virtual_space.high()); |
49164
7e958a8ebcd3
8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents:
49050
diff
changeset
|
426 |
gch->rem_set()->resize_covered_region(cmr); |
35061 | 427 |
|
37200 | 428 |
log_debug(gc, ergo, heap)( |
35061 | 429 |
"New generation size " SIZE_FORMAT "K->" SIZE_FORMAT "K [eden=" SIZE_FORMAT "K,survivor=" SIZE_FORMAT "K]", |
430 |
new_size_before/K, _virtual_space.committed_size()/K, |
|
431 |
eden()->capacity()/K, from()->capacity()/K); |
|
37200 | 432 |
log_trace(gc, ergo, heap)( |
35061 | 433 |
" [allowed " SIZE_FORMAT "K extra for %d threads]", |
1 | 434 |
thread_increase_size/K, threads_count); |
435 |
} |
|
436 |
} |
|
437 |
||
30870
3050fdcdc60b
8080112: Replace and remove the last usages of CollectedHeap::n_par_threads()
stefank
parents:
30868
diff
changeset
|
438 |
void DefNewGeneration::younger_refs_iterate(OopsInGenClosure* cl, uint n_threads) { |
1 | 439 |
assert(false, "NYI -- are you sure you want to call this?"); |
440 |
} |
|
441 |
||
442 |
||
443 |
size_t DefNewGeneration::capacity() const { |
|
444 |
return eden()->capacity() |
|
445 |
+ from()->capacity(); // to() is only used during scavenge |
|
446 |
} |
|
447 |
||
448 |
||
449 |
size_t DefNewGeneration::used() const { |
|
450 |
return eden()->used() |
|
451 |
+ from()->used(); // to() is only used during scavenge |
|
452 |
} |
|
453 |
||
454 |
||
455 |
size_t DefNewGeneration::free() const { |
|
456 |
return eden()->free() |
|
457 |
+ from()->free(); // to() is only used during scavenge |
|
458 |
} |
|
459 |
||
460 |
size_t DefNewGeneration::max_capacity() const { |
|
461 |
const size_t reserved_bytes = reserved().byte_size(); |
|
54678
93f09ca4a7f8
8198505: Remove CollectorPolicy and its subclasses
stefank
parents:
52141
diff
changeset
|
462 |
return reserved_bytes - compute_survivor_size(reserved_bytes, SpaceAlignment); |
1 | 463 |
} |
464 |
||
465 |
size_t DefNewGeneration::unsafe_max_alloc_nogc() const { |
|
466 |
return eden()->free(); |
|
467 |
} |
|
468 |
||
469 |
size_t DefNewGeneration::capacity_before_gc() const { |
|
470 |
return eden()->capacity(); |
|
471 |
} |
|
472 |
||
473 |
size_t DefNewGeneration::contiguous_available() const { |
|
474 |
return eden()->free(); |
|
475 |
} |
|
476 |
||
477 |
||
41283
2615c024f3eb
8033552: Fix missing missing volatile specifiers in CAS operations in GC code
eosterlund
parents:
40914
diff
changeset
|
478 |
HeapWord* volatile* DefNewGeneration::top_addr() const { return eden()->top_addr(); } |
1 | 479 |
HeapWord** DefNewGeneration::end_addr() const { return eden()->end_addr(); } |
480 |
||
481 |
void DefNewGeneration::object_iterate(ObjectClosure* blk) { |
|
482 |
eden()->object_iterate(blk); |
|
483 |
from()->object_iterate(blk); |
|
484 |
} |
|
485 |
||
486 |
||
487 |
void DefNewGeneration::space_iterate(SpaceClosure* blk, |
|
488 |
bool usedOnly) { |
|
489 |
blk->do_space(eden()); |
|
490 |
blk->do_space(from()); |
|
491 |
blk->do_space(to()); |
|
492 |
} |
|
493 |
||
494 |
// The last collection bailed out, we are running out of heap space, |
|
495 |
// so we try to allocate the from-space, too. |
|
496 |
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
|
497 |
bool should_try_alloc = should_allocate_from_space() || GCLocker::is_active_and_needs_gc(); |
35061 | 498 |
|
499 |
// If the Heap_lock is not locked by this thread, this will be called |
|
500 |
// again later with the Heap_lock held. |
|
501 |
bool do_alloc = should_try_alloc && (Heap_lock->owned_by_self() || (SafepointSynchronize::is_at_safepoint() && Thread::current()->is_VM_thread())); |
|
502 |
||
1 | 503 |
HeapWord* result = NULL; |
35061 | 504 |
if (do_alloc) { |
505 |
result = from()->allocate(size); |
|
506 |
} |
|
507 |
||
508 |
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
|
509 |
size, |
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
510 |
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
|
511 |
"true" : "false", |
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
512 |
Heap_lock->is_locked() ? "locked" : "unlocked", |
35061 | 513 |
from()->free(), |
514 |
should_try_alloc ? "" : " should_allocate_from_space: NOT", |
|
515 |
do_alloc ? " Heap_lock is not owned by self" : "", |
|
516 |
result == NULL ? "NULL" : "object"); |
|
517 |
||
1 | 518 |
return result; |
519 |
} |
|
520 |
||
521 |
HeapWord* DefNewGeneration::expand_and_allocate(size_t size, |
|
522 |
bool is_tlab, |
|
523 |
bool parallel) { |
|
524 |
// We don't attempt to expand the young generation (but perhaps we should.) |
|
525 |
return allocate(size, is_tlab); |
|
526 |
} |
|
527 |
||
15215
048f775ae371
8005972: ParNew should not update the tenuring threshold when promotion failed has occurred
brutisso
parents:
14583
diff
changeset
|
528 |
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
|
529 |
// Set the desired survivor size to half the real survivor space |
40914
90c87069b39c
8164936: G1 age table printout contains contents from previous GC
tschatzl
parents:
40655
diff
changeset
|
530 |
size_t const survivor_capacity = to()->capacity() / HeapWordSize; |
90c87069b39c
8164936: G1 age table printout contains contents from previous GC
tschatzl
parents:
40655
diff
changeset
|
531 |
size_t const desired_survivor_size = (size_t)((((double)survivor_capacity) * TargetSurvivorRatio) / 100); |
90c87069b39c
8164936: G1 age table printout contains contents from previous GC
tschatzl
parents:
40655
diff
changeset
|
532 |
|
90c87069b39c
8164936: G1 age table printout contains contents from previous GC
tschatzl
parents:
40655
diff
changeset
|
533 |
_tenuring_threshold = age_table()->compute_tenuring_threshold(desired_survivor_size); |
90c87069b39c
8164936: G1 age table printout contains contents from previous GC
tschatzl
parents:
40655
diff
changeset
|
534 |
|
90c87069b39c
8164936: G1 age table printout contains contents from previous GC
tschatzl
parents:
40655
diff
changeset
|
535 |
if (UsePerfData) { |
49050
170c7b36aea6
8198530: Move _gc_policy_counters from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49048
diff
changeset
|
536 |
GCPolicyCounters* gc_counters = GenCollectedHeap::heap()->counters(); |
40914
90c87069b39c
8164936: G1 age table printout contains contents from previous GC
tschatzl
parents:
40655
diff
changeset
|
537 |
gc_counters->tenuring_threshold()->set_value(_tenuring_threshold); |
90c87069b39c
8164936: G1 age table printout contains contents from previous GC
tschatzl
parents:
40655
diff
changeset
|
538 |
gc_counters->desired_survivor_size()->set_value(desired_survivor_size * oopSize); |
90c87069b39c
8164936: G1 age table printout contains contents from previous GC
tschatzl
parents:
40655
diff
changeset
|
539 |
} |
90c87069b39c
8164936: G1 age table printout contains contents from previous GC
tschatzl
parents:
40655
diff
changeset
|
540 |
|
90c87069b39c
8164936: G1 age table printout contains contents from previous GC
tschatzl
parents:
40655
diff
changeset
|
541 |
age_table()->print_age_table(_tenuring_threshold); |
15215
048f775ae371
8005972: ParNew should not update the tenuring threshold when promotion failed has occurred
brutisso
parents:
14583
diff
changeset
|
542 |
} |
1 | 543 |
|
544 |
void DefNewGeneration::collect(bool full, |
|
545 |
bool clear_all_soft_refs, |
|
546 |
size_t size, |
|
547 |
bool is_tlab) { |
|
548 |
assert(full || size > 0, "otherwise we don't want to collect"); |
|
18025 | 549 |
|
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
550 |
SerialHeap* heap = SerialHeap::heap(); |
18025 | 551 |
|
21767
41eaa9a17059
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
21561
diff
changeset
|
552 |
_gc_timer->register_gc_start(); |
18025 | 553 |
DefNewTracer gc_tracer; |
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
554 |
gc_tracer.report_gc_start(heap->gc_cause(), _gc_timer->gc_start()); |
18025 | 555 |
|
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
556 |
_old_gen = heap->old_gen(); |
1 | 557 |
|
18025 | 558 |
// If the next generation is too full to accommodate promotion |
1 | 559 |
// from this generation, pass on collection; let the next generation |
560 |
// do it. |
|
561 |
if (!collection_attempt_is_safe()) { |
|
35061 | 562 |
log_trace(gc)(":: Collection attempt not safe ::"); |
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
563 |
heap->set_incremental_collection_failed(); // Slight lie: we did not even attempt one |
1 | 564 |
return; |
565 |
} |
|
566 |
assert(to()->is_empty(), "Else not collection_attempt_is_safe"); |
|
567 |
||
568 |
init_assuming_no_promotion_failure(); |
|
569 |
||
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
570 |
GCTraceTime(Trace, gc, phases) tm("DefNew", NULL, heap->gc_cause()); |
1 | 571 |
|
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
572 |
heap->trace_heap_before_gc(&gc_tracer); |
18025 | 573 |
|
1 | 574 |
// These can be shared for all code paths |
575 |
IsAliveClosure is_alive(this); |
|
576 |
ScanWeakRefClosure scan_weak_ref(this); |
|
577 |
||
578 |
age_table()->clear(); |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
579 |
to()->clear(SpaceDecorator::Mangle); |
36202
219f8808c3bd
8146989: Introduce per-worker preserved mark stacks in ParNew
tonyp
parents:
35862
diff
changeset
|
580 |
// The preserved marks should be empty at the start of the GC. |
219f8808c3bd
8146989: Introduce per-worker preserved mark stacks in ParNew
tonyp
parents:
35862
diff
changeset
|
581 |
_preserved_marks_set.init(1); |
1 | 582 |
|
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
583 |
heap->rem_set()->prepare_for_younger_refs_iterate(false); |
1 | 584 |
|
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
585 |
assert(heap->no_allocs_since_save_marks(), |
1 | 586 |
"save marks have not been newly set."); |
587 |
||
588 |
FastScanClosure fsc_with_no_gc_barrier(this, false); |
|
589 |
FastScanClosure fsc_with_gc_barrier(this, true); |
|
590 |
||
47580 | 591 |
CLDScanClosure cld_scan_closure(&fsc_with_no_gc_barrier, |
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
592 |
heap->rem_set()->cld_rem_set()->accumulate_modified_oops()); |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
593 |
|
1 | 594 |
set_promo_failure_scan_stack_closure(&fsc_with_no_gc_barrier); |
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
595 |
FastEvacuateFollowersClosure evacuate_followers(heap, |
1 | 596 |
&fsc_with_no_gc_barrier, |
597 |
&fsc_with_gc_barrier); |
|
598 |
||
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
599 |
assert(heap->no_allocs_since_save_marks(), |
1 | 600 |
"save marks have not been newly set."); |
601 |
||
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
602 |
{ |
30871 | 603 |
// DefNew needs to run with n_threads == 0, to make sure the serial |
604 |
// version of the card table scanning code is used. |
|
49164
7e958a8ebcd3
8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents:
49050
diff
changeset
|
605 |
// See: CardTableRS::non_clean_card_iterate_possibly_parallel. |
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
606 |
StrongRootsScope srs(0); |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
607 |
|
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
608 |
heap->young_process_roots(&srs, |
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
609 |
&fsc_with_no_gc_barrier, |
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
610 |
&fsc_with_gc_barrier, |
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
611 |
&cld_scan_closure); |
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
612 |
} |
1 | 613 |
|
614 |
// "evacuate followers". |
|
615 |
evacuate_followers.do_void(); |
|
616 |
||
617 |
FastKeepAliveClosure keep_alive(this, &scan_weak_ref); |
|
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1388
diff
changeset
|
618 |
ReferenceProcessor* rp = ref_processor(); |
1610
5dddd195cc86
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
1606
diff
changeset
|
619 |
rp->setup_policy(clear_all_soft_refs); |
50396
7f48bff40a9a
8204094: assert(worker_i < _length) failed: Worker 15 is greater than max: 11 at ReferenceProcessorPhaseTimes
sangheki
parents:
50034
diff
changeset
|
620 |
ReferenceProcessorPhaseTimes pt(_gc_timer, rp->max_num_queues()); |
18025 | 621 |
const ReferenceProcessorStats& stats = |
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1388
diff
changeset
|
622 |
rp->process_discovered_references(&is_alive, &keep_alive, &evacuate_followers, |
46795
623a5e42deb6
8173335: Improve logging for j.l.ref.reference processing
sangheki
parents:
46625
diff
changeset
|
623 |
NULL, &pt); |
18025 | 624 |
gc_tracer.report_gc_reference_stats(stats); |
33143
2083f82acec8
8139134: Wrong tenuring threshold in young GC trace event
ehelin
parents:
33107
diff
changeset
|
625 |
gc_tracer.report_tenuring_threshold(tenuring_threshold()); |
46795
623a5e42deb6
8173335: Improve logging for j.l.ref.reference processing
sangheki
parents:
46625
diff
changeset
|
626 |
pt.print_all_references(); |
18025 | 627 |
|
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
628 |
assert(heap->no_allocs_since_save_marks(), "save marks have not been newly set."); |
47676
b1c020fc35a3
8189748: More precise closures for WeakProcessor::weak_oops_do calls
stefank
parents:
47648
diff
changeset
|
629 |
|
b1c020fc35a3
8189748: More precise closures for WeakProcessor::weak_oops_do calls
stefank
parents:
47648
diff
changeset
|
630 |
WeakProcessor::weak_oops_do(&is_alive, &keep_alive); |
b1c020fc35a3
8189748: More precise closures for WeakProcessor::weak_oops_do calls
stefank
parents:
47648
diff
changeset
|
631 |
|
b1c020fc35a3
8189748: More precise closures for WeakProcessor::weak_oops_do calls
stefank
parents:
47648
diff
changeset
|
632 |
// Verify that the usage of keep_alive didn't copy any objects. |
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
633 |
assert(heap->no_allocs_since_save_marks(), "save marks have not been newly set."); |
47648
226b1fc611b9
8189359: Move native weak oops cleaning out of ReferenceProcessor
stefank
parents:
47622
diff
changeset
|
634 |
|
18025 | 635 |
if (!_promotion_failed) { |
1 | 636 |
// Swap the survivor spaces. |
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
637 |
eden()->clear(SpaceDecorator::Mangle); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
638 |
from()->clear(SpaceDecorator::Mangle); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
639 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
640 |
// 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
|
641 |
// can check for valid mangling at intermediate points in the |
32623
390a27af5657
8134626: Misc cleanups after generation array removal
jwilhelm
parents:
31964
diff
changeset
|
642 |
// 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
|
643 |
// 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
|
644 |
// 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
|
645 |
// 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
|
646 |
// other spaces. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
647 |
to()->mangle_unused_area(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
648 |
} |
1 | 649 |
swap_spaces(); |
650 |
||
651 |
assert(to()->is_empty(), "to space should be empty now"); |
|
652 |
||
15215
048f775ae371
8005972: ParNew should not update the tenuring threshold when promotion failed has occurred
brutisso
parents:
14583
diff
changeset
|
653 |
adjust_desired_tenuring_threshold(); |
1 | 654 |
|
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4574
diff
changeset
|
655 |
// 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
|
656 |
// for full GC's. |
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
657 |
AdaptiveSizePolicy* size_policy = heap->size_policy(); |
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4574
diff
changeset
|
658 |
size_policy->reset_gc_overhead_limit_count(); |
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
659 |
assert(!heap->incremental_collection_failed(), "Should be clear"); |
1 | 660 |
} else { |
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
661 |
assert(_promo_failure_scan_stack.is_empty(), "post condition"); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
662 |
_promo_failure_scan_stack.clear(true); // Clear cached segments. |
1 | 663 |
|
664 |
remove_forwarding_pointers(); |
|
37422
8a7443b5edf8
8152312: ParNew: Restore preserved marks in parallel
tonyp
parents:
37248
diff
changeset
|
665 |
log_info(gc, promotion)("Promotion failed"); |
1 | 666 |
// Add to-space to the list of space to compact |
667 |
// when a promotion failure has occurred. In that |
|
668 |
// case there can be live objects in to-space |
|
669 |
// as a result of a partial evacuation of eden |
|
670 |
// and from-space. |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
671 |
swap_spaces(); // For uniformity wrt ParNewGeneration. |
1 | 672 |
from()->set_next_compaction_space(to()); |
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
673 |
heap->set_incremental_collection_failed(); |
1 | 674 |
|
4574
b2d5b0975515
6631166: CMS: better heuristics when combatting fragmentation
ysr
parents:
3908
diff
changeset
|
675 |
// 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
|
676 |
_old_gen->promotion_failure_occurred(); |
18025 | 677 |
gc_tracer.report_promotion_failed(_promotion_failed_info); |
4574
b2d5b0975515
6631166: CMS: better heuristics when combatting fragmentation
ysr
parents:
3908
diff
changeset
|
678 |
|
1 | 679 |
// Reset the PromotionFailureALot counters. |
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
680 |
NOT_PRODUCT(heap->reset_promotion_should_fail();) |
1 | 681 |
} |
36202
219f8808c3bd
8146989: Introduce per-worker preserved mark stacks in ParNew
tonyp
parents:
35862
diff
changeset
|
682 |
// We should have processed and cleared all the preserved marks. |
219f8808c3bd
8146989: Introduce per-worker preserved mark stacks in ParNew
tonyp
parents:
35862
diff
changeset
|
683 |
_preserved_marks_set.reclaim(); |
1 | 684 |
// set new iteration safe limit for the survivor spaces |
685 |
from()->set_concurrent_iteration_safe_limit(from()->top()); |
|
686 |
to()->set_concurrent_iteration_safe_limit(to()->top()); |
|
11755 | 687 |
|
18025 | 688 |
// We need to use a monotonically non-decreasing time in ms |
11755 | 689 |
// or we will see time-warp warnings and os::javaTimeMillis() |
690 |
// does not guarantee monotonicity. |
|
691 |
jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
|
692 |
update_time_of_last_gc(now); |
|
18025 | 693 |
|
50033
000c697c81db
8202639: Use concrete Generation classes in SerialHeap and CMSHeap
stefank
parents:
50032
diff
changeset
|
694 |
heap->trace_heap_after_gc(&gc_tracer); |
18025 | 695 |
|
21767
41eaa9a17059
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
21561
diff
changeset
|
696 |
_gc_timer->register_gc_end(); |
18025 | 697 |
|
698 |
gc_tracer.report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions()); |
|
1 | 699 |
} |
700 |
||
701 |
void DefNewGeneration::init_assuming_no_promotion_failure() { |
|
702 |
_promotion_failed = false; |
|
18025 | 703 |
_promotion_failed_info.reset(); |
1 | 704 |
from()->set_next_compaction_space(NULL); |
705 |
} |
|
706 |
||
707 |
void DefNewGeneration::remove_forwarding_pointers() { |
|
36202
219f8808c3bd
8146989: Introduce per-worker preserved mark stacks in ParNew
tonyp
parents:
35862
diff
changeset
|
708 |
RemoveForwardedPointerClosure rspc; |
1 | 709 |
eden()->object_iterate(&rspc); |
710 |
from()->object_iterate(&rspc); |
|
47622
817f2a7019e4
8179387: Factor out CMS specific code from GenCollectedHeap into its own subclass
rkennke
parents:
47580
diff
changeset
|
711 |
restore_preserved_marks(); |
817f2a7019e4
8179387: Factor out CMS specific code from GenCollectedHeap into its own subclass
rkennke
parents:
47580
diff
changeset
|
712 |
} |
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
713 |
|
47622
817f2a7019e4
8179387: Factor out CMS specific code from GenCollectedHeap into its own subclass
rkennke
parents:
47580
diff
changeset
|
714 |
void DefNewGeneration::restore_preserved_marks() { |
817f2a7019e4
8179387: Factor out CMS specific code from GenCollectedHeap into its own subclass
rkennke
parents:
47580
diff
changeset
|
715 |
SharedRestorePreservedMarksTaskExecutor task_executor(NULL); |
39228
32ce84798166
8156032: Clean up parallel GC specific code from vm/gc/shared/preservedMarks.cpp
lmesnik
parents:
38010
diff
changeset
|
716 |
_preserved_marks_set.restore(&task_executor); |
1 | 717 |
} |
718 |
||
719 |
void DefNewGeneration::handle_promotion_failure(oop old) { |
|
35061 | 720 |
log_debug(gc, promotion)("Promotion failure size = %d) ", old->size()); |
721 |
||
7658
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7419
diff
changeset
|
722 |
_promotion_failed = true; |
18025 | 723 |
_promotion_failed_info.register_copy_failure(old->size()); |
49722
a47d1e21b3f1
8199735: Mark word updates need to use Access API
rkennke
parents:
49594
diff
changeset
|
724 |
_preserved_marks_set.get()->push_if_necessary(old, old->mark_raw()); |
1 | 725 |
// forward to self |
726 |
old->forward_to(old); |
|
727 |
||
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
728 |
_promo_failure_scan_stack.push(old); |
1 | 729 |
|
730 |
if (!_promo_failure_drain_in_progress) { |
|
731 |
// prevent recursion in copy_to_survivor_space() |
|
732 |
_promo_failure_drain_in_progress = true; |
|
733 |
drain_promo_failure_scan_stack(); |
|
734 |
_promo_failure_drain_in_progress = false; |
|
735 |
} |
|
736 |
} |
|
737 |
||
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
738 |
oop DefNewGeneration::copy_to_survivor_space(oop old) { |
1 | 739 |
assert(is_in_reserved(old) && !old->is_forwarded(), |
740 |
"shouldn't be scavenging this oop"); |
|
741 |
size_t s = old->size(); |
|
742 |
oop obj = NULL; |
|
743 |
||
744 |
// Try allocating obj in to-space (unless too old) |
|
745 |
if (old->age() < tenuring_threshold()) { |
|
25905
04a3d83cc752
8031323: Optionally align objects copied to survivor spaces
jmasa
parents:
25492
diff
changeset
|
746 |
obj = (oop) to()->allocate_aligned(s); |
1 | 747 |
} |
748 |
||
749 |
// Otherwise try allocating obj tenured |
|
750 |
if (obj == NULL) { |
|
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
751 |
obj = _old_gen->promote(old, s); |
1 | 752 |
if (obj == NULL) { |
753 |
handle_promotion_failure(old); |
|
754 |
return old; |
|
755 |
} |
|
756 |
} else { |
|
757 |
// Prefetch beyond obj |
|
758 |
const intx interval = PrefetchCopyIntervalInBytes; |
|
759 |
Prefetch::write(obj, interval); |
|
760 |
||
761 |
// Copy obj |
|
762 |
Copy::aligned_disjoint_words((HeapWord*)old, (HeapWord*)obj, s); |
|
763 |
||
764 |
// Increment age if obj still in new generation |
|
765 |
obj->incr_age(); |
|
766 |
age_table()->add(obj, s); |
|
767 |
} |
|
768 |
||
769 |
// Done, insert forward pointer to obj in this header |
|
770 |
old->forward_to(obj); |
|
771 |
||
772 |
return obj; |
|
773 |
} |
|
774 |
||
775 |
void DefNewGeneration::drain_promo_failure_scan_stack() { |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
776 |
while (!_promo_failure_scan_stack.is_empty()) { |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
777 |
oop obj = _promo_failure_scan_stack.pop(); |
1 | 778 |
obj->oop_iterate(_promo_failure_scan_stack_closure); |
779 |
} |
|
780 |
} |
|
781 |
||
782 |
void DefNewGeneration::save_marks() { |
|
783 |
eden()->set_saved_mark(); |
|
784 |
to()->set_saved_mark(); |
|
785 |
from()->set_saved_mark(); |
|
786 |
} |
|
787 |
||
788 |
||
789 |
void DefNewGeneration::reset_saved_marks() { |
|
790 |
eden()->reset_saved_mark(); |
|
791 |
to()->reset_saved_mark(); |
|
792 |
from()->reset_saved_mark(); |
|
793 |
} |
|
794 |
||
795 |
||
796 |
bool DefNewGeneration::no_allocs_since_save_marks() { |
|
797 |
assert(eden()->saved_mark_at_top(), "Violated spec - alloc in eden"); |
|
798 |
assert(from()->saved_mark_at_top(), "Violated spec - alloc in from"); |
|
799 |
return to()->saved_mark_at_top(); |
|
800 |
} |
|
801 |
||
802 |
void DefNewGeneration::contribute_scratch(ScratchBlock*& list, Generation* requestor, |
|
803 |
size_t max_alloc_words) { |
|
31358
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
804 |
if (requestor == this || _promotion_failed) { |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
805 |
return; |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
806 |
} |
693058672cc6
8077842: Remove the level parameter passed around in GenCollectedHeap
jwilhelm
parents:
31032
diff
changeset
|
807 |
assert(GenCollectedHeap::heap()->is_old_gen(requestor), "We should not call our own generation"); |
1 | 808 |
|
809 |
/* $$$ Assert this? "trace" is a "MarkSweep" function so that's not appropriate. |
|
810 |
if (to_space->top() > to_space->bottom()) { |
|
811 |
trace("to_space not empty when contribute_scratch called"); |
|
812 |
} |
|
813 |
*/ |
|
814 |
||
815 |
ContiguousSpace* to_space = to(); |
|
816 |
assert(to_space->end() >= to_space->top(), "pointers out of order"); |
|
817 |
size_t free_words = pointer_delta(to_space->end(), to_space->top()); |
|
818 |
if (free_words >= MinFreeScratchWords) { |
|
819 |
ScratchBlock* sb = (ScratchBlock*)to_space->top(); |
|
820 |
sb->num_words = free_words; |
|
821 |
sb->next = list; |
|
822 |
list = sb; |
|
823 |
} |
|
824 |
} |
|
825 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
826 |
void DefNewGeneration::reset_scratch() { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
827 |
// 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
|
828 |
// 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
|
829 |
// 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
|
830 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
831 |
to()->mangle_unused_area_complete(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
832 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
833 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
834 |
|
1 | 835 |
bool DefNewGeneration::collection_attempt_is_safe() { |
836 |
if (!to()->is_empty()) { |
|
35061 | 837 |
log_trace(gc)(":: to is not empty ::"); |
1 | 838 |
return false; |
839 |
} |
|
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
840 |
if (_old_gen == NULL) { |
1 | 841 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
842 |
_old_gen = gch->old_gen(); |
1 | 843 |
} |
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
844 |
return _old_gen->promotion_attempt_is_safe(used()); |
1 | 845 |
} |
846 |
||
847 |
void DefNewGeneration::gc_epilogue(bool full) { |
|
6986
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
848 |
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
|
849 |
|
35492
c8c0273e6b91
8146690: Make all classes in GC follow the naming convention.
david
parents:
35471
diff
changeset
|
850 |
assert(!GCLocker::is_active(), "We should not be executing here"); |
1 | 851 |
// Check if the heap is approaching full after a collection has |
852 |
// been done. Generally the young generation is empty at |
|
853 |
// a minimum at the end of a collection. If it is not, then |
|
854 |
// the heap is approaching full. |
|
855 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
6985
e9364ec299ac
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
6762
diff
changeset
|
856 |
if (full) { |
6986
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
857 |
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
|
858 |
if (!collection_attempt_is_safe() && !_eden_space->is_empty()) { |
35061 | 859 |
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
|
860 |
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
|
861 |
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
|
862 |
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
|
863 |
} else { |
35061 | 864 |
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
|
865 |
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
|
866 |
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
|
867 |
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
|
868 |
} |
1 | 869 |
} else { |
6986
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
870 |
#ifdef ASSERT |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
871 |
// 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
|
872 |
// 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
|
873 |
// 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
|
874 |
// 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
|
875 |
// 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
|
876 |
// a full collection in between. |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
877 |
if (!seen_incremental_collection_failed && |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
878 |
gch->incremental_collection_failed()) { |
35061 | 879 |
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
|
880 |
GCCause::to_string(gch->gc_cause())); |
6986
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
881 |
seen_incremental_collection_failed = true; |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
882 |
} else if (seen_incremental_collection_failed) { |
35061 | 883 |
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
|
884 |
GCCause::to_string(gch->gc_cause())); |
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
885 |
assert(gch->gc_cause() == GCCause::_scavenge_alot || |
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
886 |
!gch->incremental_collection_failed(), |
7378
fe845b64d7fb
6998802: ScavengeALot: assert(!gch->incremental_collection_failed()) failed: Twice in a row
ysr
parents:
6986
diff
changeset
|
887 |
"Twice in a row"); |
6986
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
888 |
seen_incremental_collection_failed = false; |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
889 |
} |
daf18aec57b5
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
ysr
parents:
6985
diff
changeset
|
890 |
#endif // ASSERT |
1 | 891 |
} |
892 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
893 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
894 |
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
|
895 |
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
|
896 |
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
|
897 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
898 |
|
10022
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
7658
diff
changeset
|
899 |
if (!CleanChunkPoolAsync) { |
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
7658
diff
changeset
|
900 |
Chunk::clean_chunk_pool(); |
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
7658
diff
changeset
|
901 |
} |
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
7658
diff
changeset
|
902 |
|
1 | 903 |
// update the generation and space performance counters |
904 |
update_counters(); |
|
49050
170c7b36aea6
8198530: Move _gc_policy_counters from GenCollectorPolicy to GenCollectedHeap
stefank
parents:
49048
diff
changeset
|
905 |
gch->counters()->update_counters(); |
1 | 906 |
} |
907 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
908 |
void DefNewGeneration::record_spaces_top() { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
909 |
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
|
910 |
eden()->set_top_for_allocations(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
911 |
to()->set_top_for_allocations(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
912 |
from()->set_top_for_allocations(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
913 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
914 |
|
18025 | 915 |
void DefNewGeneration::ref_processor_init() { |
916 |
Generation::ref_processor_init(); |
|
917 |
} |
|
918 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
919 |
|
1 | 920 |
void DefNewGeneration::update_counters() { |
921 |
if (UsePerfData) { |
|
922 |
_eden_counters->update_all(); |
|
923 |
_from_counters->update_all(); |
|
924 |
_to_counters->update_all(); |
|
925 |
_gen_counters->update_all(); |
|
926 |
} |
|
927 |
} |
|
928 |
||
12379 | 929 |
void DefNewGeneration::verify() { |
930 |
eden()->verify(); |
|
931 |
from()->verify(); |
|
932 |
to()->verify(); |
|
1 | 933 |
} |
934 |
||
935 |
void DefNewGeneration::print_on(outputStream* st) const { |
|
936 |
Generation::print_on(st); |
|
937 |
st->print(" eden"); |
|
938 |
eden()->print_on(st); |
|
939 |
st->print(" from"); |
|
940 |
from()->print_on(st); |
|
941 |
st->print(" to "); |
|
942 |
to()->print_on(st); |
|
943 |
} |
|
944 |
||
945 |
||
946 |
const char* DefNewGeneration::name() const { |
|
947 |
return "def new generation"; |
|
948 |
} |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
949 |
|
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
950 |
// 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
|
951 |
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
|
952 |
return eden(); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
953 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
954 |
|
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
955 |
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
|
956 |
// 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
|
957 |
// 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
|
958 |
// 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
|
959 |
// 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
|
960 |
// 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
|
961 |
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
|
962 |
if (result != NULL) { |
50031
aa04bf7b99bd
8202591: Remove usage of CMSEdenChunksRecordAlways in defNewGeneration.cpp
stefank
parents:
49982
diff
changeset
|
963 |
if (_old_gen != NULL) { |
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
964 |
_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
|
965 |
} |
27625 | 966 |
} else { |
967 |
// If the eden is full and the last collection bailed out, we are running |
|
968 |
// out of heap space, and we try to allocate the from-space, too. |
|
969 |
// allocate_from_space can't be inlined because that would introduce a |
|
970 |
// 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
|
971 |
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
|
972 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
973 |
return result; |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
974 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
975 |
|
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
976 |
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
|
977 |
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
|
978 |
HeapWord* res = eden()->par_allocate(word_size); |
50031
aa04bf7b99bd
8202591: Remove usage of CMSEdenChunksRecordAlways in defNewGeneration.cpp
stefank
parents:
49982
diff
changeset
|
979 |
if (_old_gen != NULL) { |
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29200
diff
changeset
|
980 |
_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
|
981 |
} |
d32a17b7502c
6990419: CMS Remaining work for 6572569: consistently skewed work distribution in (long) re-mark pauses
jmasa
parents:
18687
diff
changeset
|
982 |
return res; |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
983 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
984 |
|
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
985 |
size_t DefNewGeneration::tlab_capacity() const { |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
986 |
return eden()->capacity(); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
987 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
988 |
|
22552 | 989 |
size_t DefNewGeneration::tlab_used() const { |
990 |
return eden()->used(); |
|
991 |
} |
|
992 |
||
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
993 |
size_t DefNewGeneration::unsafe_max_tlab_alloc() const { |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
994 |
return unsafe_max_alloc_nogc(); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
995 |
} |