author | chegar |
Thu, 17 Oct 2019 20:54:25 +0100 | |
branch | datagramsocketimpl-branch |
changeset 58679 | 9c3209ff7550 |
parent 58678 | 9cf78a70fa4f |
parent 57662 | f81dbe27a7b1 |
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 "aot/aotLoader.hpp" |
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#include "classfile/classLoaderDataGraph.hpp" |
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#include "classfile/stringTable.hpp" |
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#include "classfile/symbolTable.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "code/codeCache.hpp" |
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#include "gc/parallel/parallelScavengeHeap.hpp" |
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#include "gc/parallel/psAdaptiveSizePolicy.hpp" |
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#include "gc/parallel/psMarkSweep.hpp" |
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#include "gc/parallel/psMarkSweepDecorator.hpp" |
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#include "gc/parallel/psOldGen.hpp" |
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#include "gc/parallel/psScavenge.hpp" |
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#include "gc/parallel/psYoungGen.hpp" |
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#include "gc/serial/markSweep.hpp" |
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#include "gc/shared/gcCause.hpp" |
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#include "gc/shared/gcHeapSummary.hpp" |
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#include "gc/shared/gcId.hpp" |
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#include "gc/shared/gcLocker.hpp" |
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#include "gc/shared/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/isGCActiveMark.hpp" |
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#include "gc/shared/referencePolicy.hpp" |
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#include "gc/shared/referenceProcessor.hpp" |
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#include "gc/shared/referenceProcessorPhaseTimes.hpp" |
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#include "gc/shared/spaceDecorator.hpp" |
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#include "gc/shared/weakProcessor.hpp" |
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#include "memory/universe.hpp" |
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#include "logging/log.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/biasedLocking.hpp" |
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#include "runtime/flags/flagSetting.hpp" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/safepoint.hpp" |
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#include "runtime/vmThread.hpp" |
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#include "services/management.hpp" |
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#include "services/memoryService.hpp" |
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#include "utilities/align.hpp" |
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#include "utilities/events.hpp" |
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#include "utilities/stack.inline.hpp" |
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#if INCLUDE_JVMCI |
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#include "jvmci/jvmci.hpp" |
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#endif |
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elapsedTimer PSMarkSweep::_accumulated_time; |
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jlong PSMarkSweep::_time_of_last_gc = 0; |
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CollectorCounters* PSMarkSweep::_counters = NULL; |
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SpanSubjectToDiscoveryClosure PSMarkSweep::_span_based_discoverer; |
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void PSMarkSweep::initialize() { |
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_span_based_discoverer.set_span(ParallelScavengeHeap::heap()->reserved_region()); |
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set_ref_processor(new ReferenceProcessor(&_span_based_discoverer)); // a vanilla ref proc |
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_counters = new CollectorCounters("Serial full collection pauses", 1); |
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MarkSweep::initialize(); |
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} |
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// This method contains all heap specific policy for invoking mark sweep. |
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// PSMarkSweep::invoke_no_policy() will only attempt to mark-sweep-compact |
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// the heap. It will do nothing further. If we need to bail out for policy |
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// reasons, scavenge before full gc, or any other specialized behavior, it |
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// needs to be added here. |
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// |
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// Note that this method should only be called from the vm_thread while |
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// at a safepoint! |
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// |
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// Note that the all_soft_refs_clear flag in the soft ref policy |
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// may be true because this method can be called without intervening |
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// activity. For example when the heap space is tight and full measure |
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// are being taken to free space. |
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void PSMarkSweep::invoke(bool maximum_heap_compaction) { |
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assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
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assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); |
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assert(!ParallelScavengeHeap::heap()->is_gc_active(), "not reentrant"); |
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ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
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GCCause::Cause gc_cause = heap->gc_cause(); |
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PSAdaptiveSizePolicy* policy = heap->size_policy(); |
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IsGCActiveMark mark; |
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if (ScavengeBeforeFullGC) { |
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PSScavenge::invoke_no_policy(); |
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} |
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const bool clear_all_soft_refs = |
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heap->soft_ref_policy()->should_clear_all_soft_refs(); |
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uint count = maximum_heap_compaction ? 1 : MarkSweepAlwaysCompactCount; |
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UIntFlagSetting flag_setting(MarkSweepAlwaysCompactCount, count); |
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PSMarkSweep::invoke_no_policy(clear_all_soft_refs || maximum_heap_compaction); |
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} |
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// This method contains no policy. You should probably |
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// be calling invoke() instead. |
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bool PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) { |
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assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); |
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assert(ref_processor() != NULL, "Sanity"); |
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if (GCLocker::check_active_before_gc()) { |
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return false; |
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} |
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ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
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GCCause::Cause gc_cause = heap->gc_cause(); |
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GCIdMark gc_id_mark; |
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_gc_timer->register_gc_start(); |
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_gc_tracer->report_gc_start(gc_cause, _gc_timer->gc_start()); |
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PSAdaptiveSizePolicy* size_policy = heap->size_policy(); |
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// The scope of casr should end after code that can change |
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// SoftRefolicy::_should_clear_all_soft_refs. |
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ClearedAllSoftRefs casr(clear_all_softrefs, heap->soft_ref_policy()); |
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PSYoungGen* young_gen = heap->young_gen(); |
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PSOldGen* old_gen = heap->old_gen(); |
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// Increment the invocation count |
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heap->increment_total_collections(true /* full */); |
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// Save information needed to minimize mangling |
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heap->record_gen_tops_before_GC(); |
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// We need to track unique mark sweep invocations as well. |
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_total_invocations++; |
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heap->print_heap_before_gc(); |
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heap->trace_heap_before_gc(_gc_tracer); |
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// Fill in TLABs |
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heap->ensure_parsability(true); // retire TLABs |
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if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { |
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HandleMark hm; // Discard invalid handles created during verification |
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Universe::verify("Before GC"); |
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} |
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// Verify object start arrays |
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if (VerifyObjectStartArray && |
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VerifyBeforeGC) { |
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old_gen->verify_object_start_array(); |
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} |
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// Filled in below to track the state of the young gen after the collection. |
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bool eden_empty; |
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bool survivors_empty; |
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bool young_gen_empty; |
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{ |
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HandleMark hm; |
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GCTraceCPUTime tcpu; |
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GCTraceTime(Info, gc) t("Pause Full", NULL, gc_cause, true); |
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heap->pre_full_gc_dump(_gc_timer); |
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TraceCollectorStats tcs(counters()); |
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TraceMemoryManagerStats tms(heap->old_gc_manager(),gc_cause); |
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if (log_is_enabled(Debug, gc, heap, exit)) { |
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accumulated_time()->start(); |
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} |
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// Let the size policy know we're starting |
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size_policy->major_collection_begin(); |
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BiasedLocking::preserve_marks(); |
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const PreGenGCValues pre_gc_values = heap->get_pre_gc_values(); |
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allocate_stacks(); |
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#if COMPILER2_OR_JVMCI |
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DerivedPointerTable::clear(); |
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#endif |
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ref_processor()->enable_discovery(); |
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ref_processor()->setup_policy(clear_all_softrefs); |
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mark_sweep_phase1(clear_all_softrefs); |
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mark_sweep_phase2(); |
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#if COMPILER2_OR_JVMCI |
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// Don't add any more derived pointers during phase3 |
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assert(DerivedPointerTable::is_active(), "Sanity"); |
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DerivedPointerTable::set_active(false); |
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#endif |
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mark_sweep_phase3(); |
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218 |
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mark_sweep_phase4(); |
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restore_marks(); |
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deallocate_stacks(); |
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if (ZapUnusedHeapArea) { |
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// Do a complete mangle (top to end) because the usage for |
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// scratch does not maintain a top pointer. |
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young_gen->to_space()->mangle_unused_area_complete(); |
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} |
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230 |
|
1 | 231 |
eden_empty = young_gen->eden_space()->is_empty(); |
232 |
if (!eden_empty) { |
|
233 |
eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); |
|
234 |
} |
|
235 |
||
236 |
// Update heap occupancy information which is used as |
|
237 |
// input to soft ref clearing policy at the next gc. |
|
238 |
Universe::update_heap_info_at_gc(); |
|
239 |
||
240 |
survivors_empty = young_gen->from_space()->is_empty() && |
|
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241 |
young_gen->to_space()->is_empty(); |
1 | 242 |
young_gen_empty = eden_empty && survivors_empty; |
243 |
||
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244 |
PSCardTable* card_table = heap->card_table(); |
29325 | 245 |
MemRegion old_mr = heap->old_gen()->reserved(); |
246 |
if (young_gen_empty) { |
|
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card_table->clear(MemRegion(old_mr.start(), old_mr.end())); |
29325 | 248 |
} else { |
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249 |
card_table->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
1 | 250 |
} |
251 |
||
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252 |
// Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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253 |
ClassLoaderDataGraph::purge(); |
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254 |
MetaspaceUtils::verify_metrics(); |
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|
255 |
|
1 | 256 |
BiasedLocking::restore_marks(); |
54178 | 257 |
heap->prune_scavengable_nmethods(); |
1 | 258 |
|
47799 | 259 |
#if COMPILER2_OR_JVMCI |
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|
260 |
DerivedPointerTable::update_pointers(); |
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261 |
#endif |
1 | 262 |
|
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|
263 |
assert(!ref_processor()->discovery_enabled(), "Should have been disabled earlier"); |
1 | 264 |
|
265 |
// Update time of last GC |
|
266 |
reset_millis_since_last_gc(); |
|
267 |
||
268 |
// Let the size policy know we're done |
|
269 |
size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); |
|
270 |
||
271 |
if (UseAdaptiveSizePolicy) { |
|
272 |
||
35061 | 273 |
log_debug(gc, ergo)("AdaptiveSizeStart: collection: %d ", heap->total_collections()); |
274 |
log_trace(gc, ergo)("old_gen_capacity: " SIZE_FORMAT " young_gen_capacity: " SIZE_FORMAT, |
|
275 |
old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
|
1 | 276 |
|
277 |
// Don't check if the size_policy is ready here. Let |
|
278 |
// the size_policy check that internally. |
|
279 |
if (UseAdaptiveGenerationSizePolicyAtMajorCollection && |
|
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|
280 |
AdaptiveSizePolicy::should_update_promo_stats(gc_cause)) { |
23226
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|
281 |
// Swap the survivor spaces if from_space is empty. The |
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|
282 |
// resize_young_gen() called below is normally used after |
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283 |
// a successful young GC and swapping of survivor spaces; |
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|
284 |
// otherwise, it will fail to resize the young gen with |
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|
285 |
// the current implementation. |
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|
286 |
if (young_gen->from_space()->is_empty()) { |
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|
287 |
young_gen->from_space()->clear(SpaceDecorator::Mangle); |
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|
288 |
young_gen->swap_spaces(); |
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|
289 |
} |
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|
290 |
|
1 | 291 |
// Calculate optimal free space amounts |
292 |
assert(young_gen->max_size() > |
|
293 |
young_gen->from_space()->capacity_in_bytes() + |
|
294 |
young_gen->to_space()->capacity_in_bytes(), |
|
50095 | 295 |
"Sizes of space in young gen are out of bounds"); |
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|
296 |
|
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|
297 |
size_t young_live = young_gen->used_in_bytes(); |
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|
298 |
size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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|
299 |
size_t old_live = old_gen->used_in_bytes(); |
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|
300 |
size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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diff
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|
301 |
size_t max_old_gen_size = old_gen->max_gen_size(); |
1 | 302 |
size_t max_eden_size = young_gen->max_size() - |
303 |
young_gen->from_space()->capacity_in_bytes() - |
|
304 |
young_gen->to_space()->capacity_in_bytes(); |
|
17393
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diff
changeset
|
305 |
|
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diff
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|
306 |
// Used for diagnostics |
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diff
changeset
|
307 |
size_policy->clear_generation_free_space_flags(); |
7e99f263902c
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diff
changeset
|
308 |
|
17842
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8007762: Rename a bunch of methods in size policy across collectors
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diff
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|
309 |
size_policy->compute_generations_free_space(young_live, |
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|
310 |
eden_live, |
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diff
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|
311 |
old_live, |
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|
312 |
cur_eden, |
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|
313 |
max_old_gen_size, |
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diff
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|
314 |
max_eden_size, |
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diff
changeset
|
315 |
true /* full gc*/); |
17393
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diff
changeset
|
316 |
|
54085
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8212206: Refactor AdaptiveSizePolicy to separate out code related to GC overhead
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|
317 |
size_policy->check_gc_overhead_limit(eden_live, |
17393
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8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
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diff
changeset
|
318 |
max_old_gen_size, |
7e99f263902c
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
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diff
changeset
|
319 |
max_eden_size, |
7e99f263902c
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
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diff
changeset
|
320 |
true /* full gc*/, |
7e99f263902c
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
17392
diff
changeset
|
321 |
gc_cause, |
49047
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8198515: Extract SoftReferencePolicy code out of CollectorPolicy
stefank
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48168
diff
changeset
|
322 |
heap->soft_ref_policy()); |
17393
7e99f263902c
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
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diff
changeset
|
323 |
|
7e99f263902c
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
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diff
changeset
|
324 |
size_policy->decay_supplemental_growth(true /* full gc*/); |
1 | 325 |
|
326 |
heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); |
|
327 |
||
23226
3a3de05bb757
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diff
changeset
|
328 |
heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(), |
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diff
changeset
|
329 |
size_policy->calculated_survivor_size_in_bytes()); |
1 | 330 |
} |
35061 | 331 |
log_debug(gc, ergo)("AdaptiveSizeStop: collection: %d ", heap->total_collections()); |
1 | 332 |
} |
333 |
||
334 |
if (UsePerfData) { |
|
335 |
heap->gc_policy_counters()->update_counters(); |
|
336 |
heap->gc_policy_counters()->update_old_capacity( |
|
337 |
old_gen->capacity_in_bytes()); |
|
338 |
heap->gc_policy_counters()->update_young_capacity( |
|
339 |
young_gen->capacity_in_bytes()); |
|
340 |
} |
|
341 |
||
342 |
heap->resize_all_tlabs(); |
|
343 |
||
13728
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diff
changeset
|
344 |
// We collected the heap, recalculate the metaspace capacity |
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diff
changeset
|
345 |
MetaspaceGC::compute_new_size(); |
1 | 346 |
|
47546
64ba55ba8516
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diff
changeset
|
347 |
if (log_is_enabled(Debug, gc, heap, exit)) { |
64ba55ba8516
8184286: print_tracing_info() does not use Unified Logging for output
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|
348 |
accumulated_time()->stop(); |
64ba55ba8516
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|
349 |
} |
1 | 350 |
|
57662
f81dbe27a7b1
8227225: ParallelGC: add subspace transitions for young gen for gc+heap=info log lines
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diff
changeset
|
351 |
heap->print_heap_change(pre_gc_values); |
1 | 352 |
|
353 |
// Track memory usage and detect low memory |
|
354 |
MemoryService::track_memory_usage(); |
|
355 |
heap->update_counters(); |
|
35939
05df7e64ecfc
8149035: Make the full_gc_dump() calls be recorded as part of the GC
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diff
changeset
|
356 |
|
05df7e64ecfc
8149035: Make the full_gc_dump() calls be recorded as part of the GC
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diff
changeset
|
357 |
heap->post_full_gc_dump(_gc_timer); |
1 | 358 |
} |
359 |
||
360 |
if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { |
|
361 |
HandleMark hm; // Discard invalid handles created during verification |
|
35061 | 362 |
Universe::verify("After GC"); |
1 | 363 |
} |
364 |
||
365 |
// Re-verify object start arrays |
|
366 |
if (VerifyObjectStartArray && |
|
367 |
VerifyAfterGC) { |
|
368 |
old_gen->verify_object_start_array(); |
|
369 |
} |
|
370 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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diff
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|
371 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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diff
changeset
|
372 |
old_gen->object_space()->check_mangled_unused_area_complete(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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|
373 |
} |
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diff
changeset
|
374 |
|
1 | 375 |
NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
376 |
||
11636
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changeset
|
377 |
heap->print_heap_after_gc(); |
18025 | 378 |
heap->trace_heap_after_gc(_gc_tracer); |
2010
c13462bbad17
6690928: Use spinning in combination with yields for workstealing termination.
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|
379 |
|
c13462bbad17
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|
380 |
#ifdef TRACESPINNING |
c13462bbad17
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|
381 |
ParallelTaskTerminator::print_termination_counts(); |
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|
382 |
#endif |
11757
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diff
changeset
|
383 |
|
35061 | 384 |
AdaptiveSizePolicyOutput::print(size_policy, heap->total_collections()); |
385 |
||
21767
41eaa9a17059
8028128: Add a type safe alternative for working with counter based data
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diff
changeset
|
386 |
_gc_timer->register_gc_end(); |
18025 | 387 |
|
388 |
_gc_tracer->report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions()); |
|
389 |
||
11757
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changeset
|
390 |
return true; |
1 | 391 |
} |
392 |
||
393 |
bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, |
|
394 |
PSYoungGen* young_gen, |
|
395 |
PSOldGen* old_gen) { |
|
396 |
MutableSpace* const eden_space = young_gen->eden_space(); |
|
397 |
assert(!eden_space->is_empty(), "eden must be non-empty"); |
|
398 |
assert(young_gen->virtual_space()->alignment() == |
|
399 |
old_gen->virtual_space()->alignment(), "alignments do not match"); |
|
400 |
||
401 |
if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { |
|
402 |
return false; |
|
403 |
} |
|
404 |
||
405 |
// Both generations must be completely committed. |
|
406 |
if (young_gen->virtual_space()->uncommitted_size() != 0) { |
|
407 |
return false; |
|
408 |
} |
|
409 |
if (old_gen->virtual_space()->uncommitted_size() != 0) { |
|
410 |
return false; |
|
411 |
} |
|
412 |
||
413 |
// Figure out how much to take from eden. Include the average amount promoted |
|
414 |
// in the total; otherwise the next young gen GC will simply bail out to a |
|
415 |
// full GC. |
|
416 |
const size_t alignment = old_gen->virtual_space()->alignment(); |
|
417 |
const size_t eden_used = eden_space->used_in_bytes(); |
|
1668
8ec481b8f514
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changeset
|
418 |
const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
46619
a3919f5e8d2b
8178499: Remove _ptr_ and _size_ infixes from align functions
stefank
parents:
46505
diff
changeset
|
419 |
const size_t absorb_size = align_up(eden_used + promoted, alignment); |
1 | 420 |
const size_t eden_capacity = eden_space->capacity_in_bytes(); |
421 |
||
422 |
if (absorb_size >= eden_capacity) { |
|
423 |
return false; // Must leave some space in eden. |
|
424 |
} |
|
425 |
||
426 |
const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; |
|
427 |
if (new_young_size < young_gen->min_gen_size()) { |
|
428 |
return false; // Respect young gen minimum size. |
|
429 |
} |
|
430 |
||
51978 | 431 |
log_trace(gc, ergo, heap)(" absorbing " SIZE_FORMAT "K: " |
432 |
"eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " |
|
433 |
"from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " |
|
434 |
"young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", |
|
435 |
absorb_size / K, |
|
436 |
eden_capacity / K, (eden_capacity - absorb_size) / K, |
|
437 |
young_gen->from_space()->used_in_bytes() / K, |
|
438 |
young_gen->to_space()->used_in_bytes() / K, |
|
439 |
young_gen->capacity_in_bytes() / K, new_young_size / K); |
|
1 | 440 |
|
441 |
// Fill the unused part of the old gen. |
|
442 |
MutableSpace* const old_space = old_gen->object_space(); |
|
1668
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
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parents:
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diff
changeset
|
443 |
HeapWord* const unused_start = old_space->top(); |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
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diff
changeset
|
444 |
size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
1 | 445 |
|
1668
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
446 |
if (unused_words > 0) { |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
447 |
if (unused_words < CollectedHeap::min_fill_size()) { |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
448 |
return false; // If the old gen cannot be filled, must give up. |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
449 |
} |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
450 |
CollectedHeap::fill_with_objects(unused_start, unused_words); |
1 | 451 |
} |
452 |
||
453 |
// Take the live data from eden and set both top and end in the old gen to |
|
454 |
// eden top. (Need to set end because reset_after_change() mangles the region |
|
455 |
// from end to virtual_space->high() in debug builds). |
|
456 |
HeapWord* const new_top = eden_space->top(); |
|
457 |
old_gen->virtual_space()->expand_into(young_gen->virtual_space(), |
|
458 |
absorb_size); |
|
459 |
young_gen->reset_after_change(); |
|
460 |
old_space->set_top(new_top); |
|
461 |
old_space->set_end(new_top); |
|
462 |
old_gen->reset_after_change(); |
|
463 |
||
464 |
// Update the object start array for the filler object and the data from eden. |
|
465 |
ObjectStartArray* const start_array = old_gen->start_array(); |
|
1668
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
466 |
for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
467 |
start_array->allocate_block(p); |
1 | 468 |
} |
469 |
||
470 |
// Could update the promoted average here, but it is not typically updated at |
|
471 |
// full GCs and the value to use is unclear. Something like |
|
472 |
// |
|
473 |
// cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. |
|
474 |
||
475 |
size_policy->set_bytes_absorbed_from_eden(absorb_size); |
|
476 |
return true; |
|
477 |
} |
|
478 |
||
479 |
void PSMarkSweep::allocate_stacks() { |
|
30173
13cf7580b000
8077413: Avoid use of Universe::heap() inside collectors
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parents:
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diff
changeset
|
480 |
ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
1 | 481 |
PSYoungGen* young_gen = heap->young_gen(); |
482 |
||
483 |
MutableSpace* to_space = young_gen->to_space(); |
|
484 |
_preserved_marks = (PreservedMark*)to_space->top(); |
|
485 |
_preserved_count = 0; |
|
486 |
||
487 |
// We want to calculate the size in bytes first. |
|
488 |
_preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); |
|
489 |
// Now divide by the size of a PreservedMark |
|
490 |
_preserved_count_max /= sizeof(PreservedMark); |
|
491 |
} |
|
492 |
||
493 |
||
494 |
void PSMarkSweep::deallocate_stacks() { |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
495 |
_preserved_mark_stack.clear(true); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
496 |
_preserved_oop_stack.clear(true); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
497 |
_marking_stack.clear(); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
498 |
_objarray_stack.clear(true); |
1 | 499 |
} |
500 |
||
501 |
void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { |
|
502 |
// Recursively traverse all live objects and mark them |
|
37146 | 503 |
GCTraceTime(Info, gc, phases) tm("Phase 1: Mark live objects", _gc_timer); |
1 | 504 |
|
30173
13cf7580b000
8077413: Avoid use of Universe::heap() inside collectors
pliden
parents:
29798
diff
changeset
|
505 |
ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
1 | 506 |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
507 |
// Need to clear claim bits before the tracing starts. |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
508 |
ClassLoaderDataGraph::clear_claimed_marks(); |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
509 |
|
1 | 510 |
// General strong roots. |
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
511 |
{ |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
512 |
ParallelScavengeHeap::ParStrongRootsScope psrs; |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
513 |
Universe::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
514 |
JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles |
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
515 |
MarkingCodeBlobClosure each_active_code_blob(mark_and_push_closure(), !CodeBlobToOopClosure::FixRelocations); |
38074
8475fdc6dcc3
8154580: Save mirror in interpreter frame to enable cleanups of CLDClosure
coleenp
parents:
37146
diff
changeset
|
516 |
Threads::oops_do(mark_and_push_closure(), &each_active_code_blob); |
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
517 |
ObjectSynchronizer::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
518 |
Management::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
519 |
JvmtiExport::oops_do(mark_and_push_closure()); |
50297
580744d900c8
8202813: Move vm_weak processing from SystemDictionary to WeakProcessor
coleenp
parents:
50095
diff
changeset
|
520 |
SystemDictionary::oops_do(mark_and_push_closure()); |
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
521 |
ClassLoaderDataGraph::always_strong_cld_do(follow_cld_closure()); |
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
522 |
// Do not treat nmethods as strong roots for mark/sweep, since we can unload them. |
54122
4b1426ed1c44
8220343: Move scavenge_root_nmethods from shared code
stefank
parents:
54085
diff
changeset
|
523 |
//ScavengableNMethods::scavengable_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure())); |
54669
ad45b3802d4e
8220623: [JVMCI] Update JVMCI to support JVMCI based Compiler compiled into shared library
kvn
parents:
54178
diff
changeset
|
524 |
AOT_ONLY(AOTLoader::oops_do(mark_and_push_closure());) |
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
525 |
} |
1 | 526 |
|
527 |
// Flush marking stack. |
|
528 |
follow_stack(); |
|
529 |
||
530 |
// Process reference objects found during marking |
|
531 |
{ |
|
37146 | 532 |
GCTraceTime(Debug, gc, phases) t("Reference Processing", _gc_timer); |
533 |
||
1610
5dddd195cc86
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
1606
diff
changeset
|
534 |
ref_processor()->setup_policy(clear_all_softrefs); |
50396
7f48bff40a9a
8204094: assert(worker_i < _length) failed: Worker 15 is greater than max: 11 at ReferenceProcessorPhaseTimes
sangheki
parents:
50297
diff
changeset
|
535 |
ReferenceProcessorPhaseTimes pt(_gc_timer, ref_processor()->max_num_queues()); |
18025 | 536 |
const ReferenceProcessorStats& stats = |
537 |
ref_processor()->process_discovered_references( |
|
46795
623a5e42deb6
8173335: Improve logging for j.l.ref.reference processing
sangheki
parents:
46625
diff
changeset
|
538 |
is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL, &pt); |
18025 | 539 |
gc_tracer()->report_gc_reference_stats(stats); |
46795
623a5e42deb6
8173335: Improve logging for j.l.ref.reference processing
sangheki
parents:
46625
diff
changeset
|
540 |
pt.print_all_references(); |
1 | 541 |
} |
542 |
||
47676
b1c020fc35a3
8189748: More precise closures for WeakProcessor::weak_oops_do calls
stefank
parents:
47648
diff
changeset
|
543 |
// This is the point where the entire marking should have completed. |
b1c020fc35a3
8189748: More precise closures for WeakProcessor::weak_oops_do calls
stefank
parents:
47648
diff
changeset
|
544 |
assert(_marking_stack.is_empty(), "Marking should have completed"); |
b1c020fc35a3
8189748: More precise closures for WeakProcessor::weak_oops_do calls
stefank
parents:
47648
diff
changeset
|
545 |
|
47648
226b1fc611b9
8189359: Move native weak oops cleaning out of ReferenceProcessor
stefank
parents:
47546
diff
changeset
|
546 |
{ |
226b1fc611b9
8189359: Move native weak oops cleaning out of ReferenceProcessor
stefank
parents:
47546
diff
changeset
|
547 |
GCTraceTime(Debug, gc, phases) t("Weak Processing", _gc_timer); |
47676
b1c020fc35a3
8189748: More precise closures for WeakProcessor::weak_oops_do calls
stefank
parents:
47648
diff
changeset
|
548 |
WeakProcessor::weak_oops_do(is_alive_closure(), &do_nothing_cl); |
47648
226b1fc611b9
8189359: Move native weak oops cleaning out of ReferenceProcessor
stefank
parents:
47546
diff
changeset
|
549 |
} |
226b1fc611b9
8189359: Move native weak oops cleaning out of ReferenceProcessor
stefank
parents:
47546
diff
changeset
|
550 |
|
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
551 |
{ |
37146 | 552 |
GCTraceTime(Debug, gc, phases) t("Class Unloading", _gc_timer); |
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
553 |
|
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
554 |
// Unload classes and purge the SystemDictionary. |
50297
580744d900c8
8202813: Move vm_weak processing from SystemDictionary to WeakProcessor
coleenp
parents:
50095
diff
changeset
|
555 |
bool purged_class = SystemDictionary::do_unloading(_gc_timer); |
1 | 556 |
|
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
557 |
// Unload nmethods. |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
558 |
CodeCache::do_unloading(is_alive_closure(), purged_class); |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
559 |
|
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
560 |
// Prune dead klasses from subklass/sibling/implementor lists. |
49969
8624981f1ffa
8202447: Fix unloading_occurred to mean unloading_occurred
coleenp
parents:
49967
diff
changeset
|
561 |
Klass::clean_weak_klass_links(purged_class); |
54669
ad45b3802d4e
8220623: [JVMCI] Update JVMCI to support JVMCI based Compiler compiled into shared library
kvn
parents:
54178
diff
changeset
|
562 |
|
ad45b3802d4e
8220623: [JVMCI] Update JVMCI to support JVMCI based Compiler compiled into shared library
kvn
parents:
54178
diff
changeset
|
563 |
// Clean JVMCI metadata handles. |
ad45b3802d4e
8220623: [JVMCI] Update JVMCI to support JVMCI based Compiler compiled into shared library
kvn
parents:
54178
diff
changeset
|
564 |
JVMCI_ONLY(JVMCI::do_unloading(purged_class)); |
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
565 |
} |
1 | 566 |
|
18025 | 567 |
_gc_tracer->report_object_count_after_gc(is_alive_closure()); |
1 | 568 |
} |
569 |
||
570 |
||
571 |
void PSMarkSweep::mark_sweep_phase2() { |
|
37146 | 572 |
GCTraceTime(Info, gc, phases) tm("Phase 2: Compute new object addresses", _gc_timer); |
1 | 573 |
|
574 |
// Now all live objects are marked, compute the new object addresses. |
|
575 |
||
576 |
// It is not required that we traverse spaces in the same order in |
|
577 |
// phase2, phase3 and phase4, but the ValidateMarkSweep live oops |
|
578 |
// tracking expects us to do so. See comment under phase4. |
|
579 |
||
30173
13cf7580b000
8077413: Avoid use of Universe::heap() inside collectors
pliden
parents:
29798
diff
changeset
|
580 |
ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
1 | 581 |
PSOldGen* old_gen = heap->old_gen(); |
582 |
||
583 |
// Begin compacting into the old gen |
|
584 |
PSMarkSweepDecorator::set_destination_decorator_tenured(); |
|
585 |
||
586 |
// This will also compact the young gen spaces. |
|
587 |
old_gen->precompact(); |
|
588 |
} |
|
589 |
||
590 |
void PSMarkSweep::mark_sweep_phase3() { |
|
591 |
// Adjust the pointers to reflect the new locations |
|
37146 | 592 |
GCTraceTime(Info, gc, phases) tm("Phase 3: Adjust pointers", _gc_timer); |
1 | 593 |
|
30173
13cf7580b000
8077413: Avoid use of Universe::heap() inside collectors
pliden
parents:
29798
diff
changeset
|
594 |
ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
1 | 595 |
PSYoungGen* young_gen = heap->young_gen(); |
596 |
PSOldGen* old_gen = heap->old_gen(); |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
597 |
|
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
598 |
// Need to clear claim bits before the tracing starts. |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
599 |
ClassLoaderDataGraph::clear_claimed_marks(); |
1 | 600 |
|
601 |
// General strong roots. |
|
17105
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
602 |
Universe::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
603 |
JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles |
38074
8475fdc6dcc3
8154580: Save mirror in interpreter frame to enable cleanups of CLDClosure
coleenp
parents:
37146
diff
changeset
|
604 |
Threads::oops_do(adjust_pointer_closure(), NULL); |
17105
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
605 |
ObjectSynchronizer::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
606 |
Management::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
607 |
JvmtiExport::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
608 |
SystemDictionary::oops_do(adjust_pointer_closure()); |
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
609 |
ClassLoaderDataGraph::cld_do(adjust_cld_closure()); |
1 | 610 |
|
611 |
// Now adjust pointers in remaining weak roots. (All of which should |
|
612 |
// have been cleared if they pointed to non-surviving objects.) |
|
613 |
// Global (weak) JNI handles |
|
47648
226b1fc611b9
8189359: Move native weak oops cleaning out of ReferenceProcessor
stefank
parents:
47546
diff
changeset
|
614 |
WeakProcessor::oops_do(adjust_pointer_closure()); |
1 | 615 |
|
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
616 |
CodeBlobToOopClosure adjust_from_blobs(adjust_pointer_closure(), CodeBlobToOopClosure::FixRelocations); |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
617 |
CodeCache::blobs_do(&adjust_from_blobs); |
54669
ad45b3802d4e
8220623: [JVMCI] Update JVMCI to support JVMCI based Compiler compiled into shared library
kvn
parents:
54178
diff
changeset
|
618 |
AOT_ONLY(AOTLoader::oops_do(adjust_pointer_closure());) |
ad45b3802d4e
8220623: [JVMCI] Update JVMCI to support JVMCI based Compiler compiled into shared library
kvn
parents:
54178
diff
changeset
|
619 |
|
17105
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
620 |
ref_processor()->weak_oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
621 |
PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure()); |
1 | 622 |
|
623 |
adjust_marks(); |
|
624 |
||
625 |
young_gen->adjust_pointers(); |
|
626 |
old_gen->adjust_pointers(); |
|
627 |
} |
|
628 |
||
629 |
void PSMarkSweep::mark_sweep_phase4() { |
|
630 |
EventMark m("4 compact heap"); |
|
37146 | 631 |
GCTraceTime(Info, gc, phases) tm("Phase 4: Move objects", _gc_timer); |
1 | 632 |
|
633 |
// All pointers are now adjusted, move objects accordingly |
|
634 |
||
30173
13cf7580b000
8077413: Avoid use of Universe::heap() inside collectors
pliden
parents:
29798
diff
changeset
|
635 |
ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
1 | 636 |
PSYoungGen* young_gen = heap->young_gen(); |
637 |
PSOldGen* old_gen = heap->old_gen(); |
|
638 |
||
639 |
old_gen->compact(); |
|
640 |
young_gen->compact(); |
|
641 |
} |
|
642 |
||
643 |
jlong PSMarkSweep::millis_since_last_gc() { |
|
22551 | 644 |
// We need a monotonically non-decreasing time in ms but |
11251
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
10670
diff
changeset
|
645 |
// os::javaTimeMillis() does not guarantee monotonicity. |
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
10670
diff
changeset
|
646 |
jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
10670
diff
changeset
|
647 |
jlong ret_val = now - _time_of_last_gc; |
1 | 648 |
// XXX See note in genCollectedHeap::millis_since_last_gc(). |
649 |
if (ret_val < 0) { |
|
37073
c39d0903390b
8151605: Change warning() to log_warning(gc) in the GC code
brutisso
parents:
35939
diff
changeset
|
650 |
NOT_PRODUCT(log_warning(gc)("time warp: " JLONG_FORMAT, ret_val);) |
1 | 651 |
return 0; |
652 |
} |
|
653 |
return ret_val; |
|
654 |
} |
|
655 |
||
656 |
void PSMarkSweep::reset_millis_since_last_gc() { |
|
22551 | 657 |
// We need a monotonically non-decreasing time in ms but |
11251
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
10670
diff
changeset
|
658 |
// os::javaTimeMillis() does not guarantee monotonicity. |
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
10670
diff
changeset
|
659 |
_time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
1 | 660 |
} |