author | coleenp |
Sat, 27 May 2017 09:21:01 -0400 | |
changeset 46505 | fd4bc78630b1 |
parent 42650 | 1f304d0c888b |
child 46619 | a3919f5e8d2b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2017, 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/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.inline.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/spaceDecorator.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/fprofiler.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/events.hpp" |
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#include "utilities/stack.inline.hpp" |
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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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void PSMarkSweep::initialize() { |
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MemRegion mr = ParallelScavengeHeap::heap()->reserved_region(); |
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set_ref_processor(new ReferenceProcessor(mr)); // a vanilla ref proc |
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_counters = new CollectorCounters("PSMarkSweep", 1); |
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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 collector 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->collector_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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// CollectorPolicy::_should_clear_all_soft_refs. |
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ClearedAllSoftRefs casr(clear_all_softrefs, heap->collector_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->accumulate_statistics_all_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(true /* Full GC */,gc_cause); |
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if (TraceOldGenTime) accumulated_time()->start(); |
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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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CodeCache::gc_prologue(); |
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BiasedLocking::preserve_marks(); |
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// Capture metadata size before collection for sizing. |
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size_t metadata_prev_used = MetaspaceAux::used_bytes(); |
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size_t old_gen_prev_used = old_gen->used_in_bytes(); |
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size_t young_gen_prev_used = young_gen->used_in_bytes(); |
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allocate_stacks(); |
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#if defined(COMPILER2) || INCLUDE_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 defined(COMPILER2) || INCLUDE_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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210 |
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mark_sweep_phase4(); |
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212 |
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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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eden_empty = young_gen->eden_space()->is_empty(); |
224 |
if (!eden_empty) { |
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225 |
eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); |
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226 |
} |
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227 |
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228 |
// Update heap occupancy information which is used as |
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229 |
// input to soft ref clearing policy at the next gc. |
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230 |
Universe::update_heap_info_at_gc(); |
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231 |
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232 |
survivors_empty = young_gen->from_space()->is_empty() && |
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young_gen->to_space()->is_empty(); |
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young_gen_empty = eden_empty && survivors_empty; |
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ModRefBarrierSet* modBS = barrier_set_cast<ModRefBarrierSet>(heap->barrier_set()); |
237 |
MemRegion old_mr = heap->old_gen()->reserved(); |
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238 |
if (young_gen_empty) { |
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239 |
modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
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240 |
} else { |
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241 |
modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
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1 | 242 |
} |
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// Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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ClassLoaderDataGraph::purge(); |
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MetaspaceAux::verify_metrics(); |
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|
247 |
|
1 | 248 |
BiasedLocking::restore_marks(); |
249 |
CodeCache::gc_epilogue(); |
|
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|
250 |
JvmtiExport::gc_epilogue(); |
1 | 251 |
|
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|
252 |
#if defined(COMPILER2) || INCLUDE_JVMCI |
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253 |
DerivedPointerTable::update_pointers(); |
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|
254 |
#endif |
1 | 255 |
|
256 |
ref_processor()->enqueue_discovered_references(NULL); |
|
257 |
||
258 |
// Update time of last GC |
|
259 |
reset_millis_since_last_gc(); |
|
260 |
||
261 |
// Let the size policy know we're done |
|
262 |
size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); |
|
263 |
||
264 |
if (UseAdaptiveSizePolicy) { |
|
265 |
||
35061 | 266 |
log_debug(gc, ergo)("AdaptiveSizeStart: collection: %d ", heap->total_collections()); |
267 |
log_trace(gc, ergo)("old_gen_capacity: " SIZE_FORMAT " young_gen_capacity: " SIZE_FORMAT, |
|
268 |
old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
|
1 | 269 |
|
270 |
// Don't check if the size_policy is ready here. Let |
|
271 |
// the size_policy check that internally. |
|
272 |
if (UseAdaptiveGenerationSizePolicyAtMajorCollection && |
|
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|
273 |
AdaptiveSizePolicy::should_update_promo_stats(gc_cause)) { |
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274 |
// Swap the survivor spaces if from_space is empty. The |
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275 |
// resize_young_gen() called below is normally used after |
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276 |
// a successful young GC and swapping of survivor spaces; |
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277 |
// otherwise, it will fail to resize the young gen with |
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|
278 |
// the current implementation. |
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279 |
if (young_gen->from_space()->is_empty()) { |
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280 |
young_gen->from_space()->clear(SpaceDecorator::Mangle); |
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281 |
young_gen->swap_spaces(); |
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|
282 |
} |
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|
283 |
|
1 | 284 |
// Calculate optimal free space amounts |
285 |
assert(young_gen->max_size() > |
|
286 |
young_gen->from_space()->capacity_in_bytes() + |
|
287 |
young_gen->to_space()->capacity_in_bytes(), |
|
288 |
"Sizes of space in young gen are out-of-bounds"); |
|
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|
289 |
|
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|
290 |
size_t young_live = young_gen->used_in_bytes(); |
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|
291 |
size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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|
292 |
size_t old_live = old_gen->used_in_bytes(); |
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|
293 |
size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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|
294 |
size_t max_old_gen_size = old_gen->max_gen_size(); |
1 | 295 |
size_t max_eden_size = young_gen->max_size() - |
296 |
young_gen->from_space()->capacity_in_bytes() - |
|
297 |
young_gen->to_space()->capacity_in_bytes(); |
|
17393
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|
298 |
|
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|
299 |
// Used for diagnostics |
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|
300 |
size_policy->clear_generation_free_space_flags(); |
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|
301 |
|
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|
302 |
size_policy->compute_generations_free_space(young_live, |
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|
303 |
eden_live, |
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|
304 |
old_live, |
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|
305 |
cur_eden, |
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|
306 |
max_old_gen_size, |
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|
307 |
max_eden_size, |
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|
308 |
true /* full gc*/); |
17393
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|
309 |
|
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|
310 |
size_policy->check_gc_overhead_limit(young_live, |
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|
311 |
eden_live, |
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|
312 |
max_old_gen_size, |
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|
313 |
max_eden_size, |
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|
314 |
true /* full gc*/, |
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|
315 |
gc_cause, |
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|
316 |
heap->collector_policy()); |
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|
317 |
|
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|
318 |
size_policy->decay_supplemental_growth(true /* full gc*/); |
1 | 319 |
|
320 |
heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); |
|
321 |
||
23226
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|
322 |
heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(), |
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|
323 |
size_policy->calculated_survivor_size_in_bytes()); |
1 | 324 |
} |
35061 | 325 |
log_debug(gc, ergo)("AdaptiveSizeStop: collection: %d ", heap->total_collections()); |
1 | 326 |
} |
327 |
||
328 |
if (UsePerfData) { |
|
329 |
heap->gc_policy_counters()->update_counters(); |
|
330 |
heap->gc_policy_counters()->update_old_capacity( |
|
331 |
old_gen->capacity_in_bytes()); |
|
332 |
heap->gc_policy_counters()->update_young_capacity( |
|
333 |
young_gen->capacity_in_bytes()); |
|
334 |
} |
|
335 |
||
336 |
heap->resize_all_tlabs(); |
|
337 |
||
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|
338 |
// We collected the heap, recalculate the metaspace capacity |
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|
339 |
MetaspaceGC::compute_new_size(); |
1 | 340 |
|
24941
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8042298: Remove the names gen0 and gen1 from the GC code
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|
341 |
if (TraceOldGenTime) accumulated_time()->stop(); |
1 | 342 |
|
35061 | 343 |
young_gen->print_used_change(young_gen_prev_used); |
344 |
old_gen->print_used_change(old_gen_prev_used); |
|
345 |
MetaspaceAux::print_metaspace_change(metadata_prev_used); |
|
1 | 346 |
|
347 |
// Track memory usage and detect low memory |
|
348 |
MemoryService::track_memory_usage(); |
|
349 |
heap->update_counters(); |
|
35939
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|
350 |
|
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|
351 |
heap->post_full_gc_dump(_gc_timer); |
1 | 352 |
} |
353 |
||
354 |
if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { |
|
355 |
HandleMark hm; // Discard invalid handles created during verification |
|
35061 | 356 |
Universe::verify("After GC"); |
1 | 357 |
} |
358 |
||
359 |
// Re-verify object start arrays |
|
360 |
if (VerifyObjectStartArray && |
|
361 |
VerifyAfterGC) { |
|
362 |
old_gen->verify_object_start_array(); |
|
363 |
} |
|
364 |
||
971
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|
365 |
if (ZapUnusedHeapArea) { |
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|
366 |
old_gen->object_space()->check_mangled_unused_area_complete(); |
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|
367 |
} |
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|
368 |
|
1 | 369 |
NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
370 |
||
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|
371 |
heap->print_heap_after_gc(); |
18025 | 372 |
heap->trace_heap_after_gc(_gc_tracer); |
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|
373 |
|
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|
374 |
#ifdef TRACESPINNING |
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|
375 |
ParallelTaskTerminator::print_termination_counts(); |
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|
376 |
#endif |
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|
377 |
|
35061 | 378 |
AdaptiveSizePolicyOutput::print(size_policy, heap->total_collections()); |
379 |
||
21767
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|
380 |
_gc_timer->register_gc_end(); |
18025 | 381 |
|
382 |
_gc_tracer->report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions()); |
|
383 |
||
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|
384 |
return true; |
1 | 385 |
} |
386 |
||
387 |
bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, |
|
388 |
PSYoungGen* young_gen, |
|
389 |
PSOldGen* old_gen) { |
|
390 |
MutableSpace* const eden_space = young_gen->eden_space(); |
|
391 |
assert(!eden_space->is_empty(), "eden must be non-empty"); |
|
392 |
assert(young_gen->virtual_space()->alignment() == |
|
393 |
old_gen->virtual_space()->alignment(), "alignments do not match"); |
|
394 |
||
395 |
if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { |
|
396 |
return false; |
|
397 |
} |
|
398 |
||
399 |
// Both generations must be completely committed. |
|
400 |
if (young_gen->virtual_space()->uncommitted_size() != 0) { |
|
401 |
return false; |
|
402 |
} |
|
403 |
if (old_gen->virtual_space()->uncommitted_size() != 0) { |
|
404 |
return false; |
|
405 |
} |
|
406 |
||
407 |
// Figure out how much to take from eden. Include the average amount promoted |
|
408 |
// in the total; otherwise the next young gen GC will simply bail out to a |
|
409 |
// full GC. |
|
410 |
const size_t alignment = old_gen->virtual_space()->alignment(); |
|
411 |
const size_t eden_used = eden_space->used_in_bytes(); |
|
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|
412 |
const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
1 | 413 |
const size_t absorb_size = align_size_up(eden_used + promoted, alignment); |
414 |
const size_t eden_capacity = eden_space->capacity_in_bytes(); |
|
415 |
||
416 |
if (absorb_size >= eden_capacity) { |
|
417 |
return false; // Must leave some space in eden. |
|
418 |
} |
|
419 |
||
420 |
const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; |
|
421 |
if (new_young_size < young_gen->min_gen_size()) { |
|
422 |
return false; // Respect young gen minimum size. |
|
423 |
} |
|
424 |
||
35061 | 425 |
log_trace(heap, ergo)(" absorbing " SIZE_FORMAT "K: " |
1 | 426 |
"eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " |
427 |
"from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " |
|
428 |
"young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", |
|
429 |
absorb_size / K, |
|
430 |
eden_capacity / K, (eden_capacity - absorb_size) / K, |
|
431 |
young_gen->from_space()->used_in_bytes() / K, |
|
432 |
young_gen->to_space()->used_in_bytes() / K, |
|
433 |
young_gen->capacity_in_bytes() / K, new_young_size / K); |
|
434 |
||
435 |
// Fill the unused part of the old gen. |
|
436 |
MutableSpace* const old_space = old_gen->object_space(); |
|
1668
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|
437 |
HeapWord* const unused_start = old_space->top(); |
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|
438 |
size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
1 | 439 |
|
1668
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|
440 |
if (unused_words > 0) { |
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|
441 |
if (unused_words < CollectedHeap::min_fill_size()) { |
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|
442 |
return false; // If the old gen cannot be filled, must give up. |
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|
443 |
} |
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diff
changeset
|
444 |
CollectedHeap::fill_with_objects(unused_start, unused_words); |
1 | 445 |
} |
446 |
||
447 |
// Take the live data from eden and set both top and end in the old gen to |
|
448 |
// eden top. (Need to set end because reset_after_change() mangles the region |
|
449 |
// from end to virtual_space->high() in debug builds). |
|
450 |
HeapWord* const new_top = eden_space->top(); |
|
451 |
old_gen->virtual_space()->expand_into(young_gen->virtual_space(), |
|
452 |
absorb_size); |
|
453 |
young_gen->reset_after_change(); |
|
454 |
old_space->set_top(new_top); |
|
455 |
old_space->set_end(new_top); |
|
456 |
old_gen->reset_after_change(); |
|
457 |
||
458 |
// Update the object start array for the filler object and the data from eden. |
|
459 |
ObjectStartArray* const start_array = old_gen->start_array(); |
|
1668
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diff
changeset
|
460 |
for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
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diff
changeset
|
461 |
start_array->allocate_block(p); |
1 | 462 |
} |
463 |
||
464 |
// Could update the promoted average here, but it is not typically updated at |
|
465 |
// full GCs and the value to use is unclear. Something like |
|
466 |
// |
|
467 |
// cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. |
|
468 |
||
469 |
size_policy->set_bytes_absorbed_from_eden(absorb_size); |
|
470 |
return true; |
|
471 |
} |
|
472 |
||
473 |
void PSMarkSweep::allocate_stacks() { |
|
30173
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parents:
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changeset
|
474 |
ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
1 | 475 |
PSYoungGen* young_gen = heap->young_gen(); |
476 |
||
477 |
MutableSpace* to_space = young_gen->to_space(); |
|
478 |
_preserved_marks = (PreservedMark*)to_space->top(); |
|
479 |
_preserved_count = 0; |
|
480 |
||
481 |
// We want to calculate the size in bytes first. |
|
482 |
_preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); |
|
483 |
// Now divide by the size of a PreservedMark |
|
484 |
_preserved_count_max /= sizeof(PreservedMark); |
|
485 |
} |
|
486 |
||
487 |
||
488 |
void PSMarkSweep::deallocate_stacks() { |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
489 |
_preserved_mark_stack.clear(true); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
490 |
_preserved_oop_stack.clear(true); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
491 |
_marking_stack.clear(); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
492 |
_objarray_stack.clear(true); |
1 | 493 |
} |
494 |
||
495 |
void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { |
|
496 |
// Recursively traverse all live objects and mark them |
|
37146 | 497 |
GCTraceTime(Info, gc, phases) tm("Phase 1: Mark live objects", _gc_timer); |
1 | 498 |
|
30173
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8077413: Avoid use of Universe::heap() inside collectors
pliden
parents:
29798
diff
changeset
|
499 |
ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
1 | 500 |
|
13728
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6964458: Reimplement class meta-data storage to use native memory
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parents:
12630
diff
changeset
|
501 |
// 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
|
502 |
ClassLoaderDataGraph::clear_claimed_marks(); |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
503 |
|
1 | 504 |
// General strong roots. |
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
505 |
{ |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
506 |
ParallelScavengeHeap::ParStrongRootsScope psrs; |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
507 |
Universe::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
508 |
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
|
509 |
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
|
510 |
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
|
511 |
ObjectSynchronizer::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
512 |
FlatProfiler::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
513 |
Management::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
514 |
JvmtiExport::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
515 |
SystemDictionary::always_strong_oops_do(mark_and_push_closure()); |
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
516 |
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
|
517 |
// Do not treat nmethods as strong roots for mark/sweep, since we can unload them. |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
518 |
//CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure())); |
42650 | 519 |
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
|
520 |
} |
1 | 521 |
|
522 |
// Flush marking stack. |
|
523 |
follow_stack(); |
|
524 |
||
525 |
// Process reference objects found during marking |
|
526 |
{ |
|
37146 | 527 |
GCTraceTime(Debug, gc, phases) t("Reference Processing", _gc_timer); |
528 |
||
1610
5dddd195cc86
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
1606
diff
changeset
|
529 |
ref_processor()->setup_policy(clear_all_softrefs); |
18025 | 530 |
const ReferenceProcessorStats& stats = |
531 |
ref_processor()->process_discovered_references( |
|
33107
77bf0d2069a3
8134953: Make the GC ID available in a central place
brutisso
parents:
32606
diff
changeset
|
532 |
is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL, _gc_timer); |
18025 | 533 |
gc_tracer()->report_gc_reference_stats(stats); |
1 | 534 |
} |
535 |
||
17114
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17112
diff
changeset
|
536 |
// This is the point where the entire marking should have completed. |
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17112
diff
changeset
|
537 |
assert(_marking_stack.is_empty(), "Marking should have completed"); |
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17112
diff
changeset
|
538 |
|
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
539 |
{ |
37146 | 540 |
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
|
541 |
|
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
542 |
// Unload classes and purge the SystemDictionary. |
46505
fd4bc78630b1
8174749: Use hash table/oops for MemberName table
coleenp
parents:
42650
diff
changeset
|
543 |
bool purged_class = SystemDictionary::do_unloading(is_alive_closure(), _gc_timer); |
1 | 544 |
|
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
545 |
// Unload nmethods. |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
546 |
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
|
547 |
|
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
548 |
// Prune dead klasses from subklass/sibling/implementor lists. |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
549 |
Klass::clean_weak_klass_links(is_alive_closure()); |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
550 |
} |
1 | 551 |
|
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
552 |
{ |
37146 | 553 |
GCTraceTime(Debug, gc, phases) t("Scrub String Table", _gc_timer); |
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
554 |
// Delete entries for dead interned strings. |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
555 |
StringTable::unlink(is_alive_closure()); |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
556 |
} |
3696 | 557 |
|
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
558 |
{ |
37146 | 559 |
GCTraceTime(Debug, gc, phases) t("Scrub Symbol Table", _gc_timer); |
37140
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
560 |
// Clean up unreferenced symbols in symbol table. |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
561 |
SymbolTable::unlink(); |
b62549ead2cf
8027423: Parallel compact GC class unloading measurement includes symbol and string table time
stefank
parents:
37106
diff
changeset
|
562 |
} |
17114
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17112
diff
changeset
|
563 |
|
18025 | 564 |
_gc_tracer->report_object_count_after_gc(is_alive_closure()); |
1 | 565 |
} |
566 |
||
567 |
||
568 |
void PSMarkSweep::mark_sweep_phase2() { |
|
37146 | 569 |
GCTraceTime(Info, gc, phases) tm("Phase 2: Compute new object addresses", _gc_timer); |
1 | 570 |
|
571 |
// Now all live objects are marked, compute the new object addresses. |
|
572 |
||
573 |
// It is not required that we traverse spaces in the same order in |
|
574 |
// phase2, phase3 and phase4, but the ValidateMarkSweep live oops |
|
575 |
// tracking expects us to do so. See comment under phase4. |
|
576 |
||
30173
13cf7580b000
8077413: Avoid use of Universe::heap() inside collectors
pliden
parents:
29798
diff
changeset
|
577 |
ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
1 | 578 |
PSOldGen* old_gen = heap->old_gen(); |
579 |
||
580 |
// Begin compacting into the old gen |
|
581 |
PSMarkSweepDecorator::set_destination_decorator_tenured(); |
|
582 |
||
583 |
// This will also compact the young gen spaces. |
|
584 |
old_gen->precompact(); |
|
585 |
} |
|
586 |
||
587 |
void PSMarkSweep::mark_sweep_phase3() { |
|
588 |
// Adjust the pointers to reflect the new locations |
|
37146 | 589 |
GCTraceTime(Info, gc, phases) tm("Phase 3: Adjust pointers", _gc_timer); |
1 | 590 |
|
30173
13cf7580b000
8077413: Avoid use of Universe::heap() inside collectors
pliden
parents:
29798
diff
changeset
|
591 |
ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
1 | 592 |
PSYoungGen* young_gen = heap->young_gen(); |
593 |
PSOldGen* old_gen = heap->old_gen(); |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
594 |
|
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
595 |
// 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
|
596 |
ClassLoaderDataGraph::clear_claimed_marks(); |
1 | 597 |
|
598 |
// General strong roots. |
|
17105
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
599 |
Universe::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
600 |
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
|
601 |
Threads::oops_do(adjust_pointer_closure(), NULL); |
17105
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
602 |
ObjectSynchronizer::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
603 |
FlatProfiler::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
604 |
Management::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
605 |
JvmtiExport::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
606 |
SystemDictionary::oops_do(adjust_pointer_closure()); |
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
607 |
ClassLoaderDataGraph::cld_do(adjust_cld_closure()); |
1 | 608 |
|
609 |
// Now adjust pointers in remaining weak roots. (All of which should |
|
610 |
// have been cleared if they pointed to non-surviving objects.) |
|
611 |
// Global (weak) JNI handles |
|
37106 | 612 |
JNIHandles::weak_oops_do(adjust_pointer_closure()); |
1 | 613 |
|
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
614 |
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
|
615 |
CodeCache::blobs_do(&adjust_from_blobs); |
42650 | 616 |
AOTLoader::oops_do(adjust_pointer_closure()); |
17105
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
617 |
StringTable::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
618 |
ref_processor()->weak_oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
619 |
PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure()); |
1 | 620 |
|
621 |
adjust_marks(); |
|
622 |
||
623 |
young_gen->adjust_pointers(); |
|
624 |
old_gen->adjust_pointers(); |
|
625 |
} |
|
626 |
||
627 |
void PSMarkSweep::mark_sweep_phase4() { |
|
628 |
EventMark m("4 compact heap"); |
|
37146 | 629 |
GCTraceTime(Info, gc, phases) tm("Phase 4: Move objects", _gc_timer); |
1 | 630 |
|
631 |
// All pointers are now adjusted, move objects accordingly |
|
632 |
||
30173
13cf7580b000
8077413: Avoid use of Universe::heap() inside collectors
pliden
parents:
29798
diff
changeset
|
633 |
ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
1 | 634 |
PSYoungGen* young_gen = heap->young_gen(); |
635 |
PSOldGen* old_gen = heap->old_gen(); |
|
636 |
||
637 |
old_gen->compact(); |
|
638 |
young_gen->compact(); |
|
639 |
} |
|
640 |
||
641 |
jlong PSMarkSweep::millis_since_last_gc() { |
|
22551 | 642 |
// 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
|
643 |
// 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
|
644 |
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
|
645 |
jlong ret_val = now - _time_of_last_gc; |
1 | 646 |
// XXX See note in genCollectedHeap::millis_since_last_gc(). |
647 |
if (ret_val < 0) { |
|
37073
c39d0903390b
8151605: Change warning() to log_warning(gc) in the GC code
brutisso
parents:
35939
diff
changeset
|
648 |
NOT_PRODUCT(log_warning(gc)("time warp: " JLONG_FORMAT, ret_val);) |
1 | 649 |
return 0; |
650 |
} |
|
651 |
return ret_val; |
|
652 |
} |
|
653 |
||
654 |
void PSMarkSweep::reset_millis_since_last_gc() { |
|
22551 | 655 |
// 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
|
656 |
// 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
|
657 |
_time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
1 | 658 |
} |