author | jmasa |
Fri, 01 Aug 2014 15:40:12 -0700 | |
changeset 25905 | 04a3d83cc752 |
parent 25714 | 87fa6860b5ae |
child 27887 | 8e793accbf05 |
permissions | -rw-r--r-- |
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1 | 2 |
/* |
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* Copyright (c) 2001, 2014, 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 "classfile/stringTable.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "code/codeCache.hpp" |
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#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
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#include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" |
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#include "gc_implementation/parallelScavenge/psMarkSweep.hpp" |
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#include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" |
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#include "gc_implementation/parallelScavenge/psOldGen.hpp" |
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#include "gc_implementation/parallelScavenge/psScavenge.hpp" |
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#include "gc_implementation/parallelScavenge/psYoungGen.hpp" |
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#include "gc_implementation/shared/gcHeapSummary.hpp" |
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#include "gc_implementation/shared/gcTimer.hpp" |
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#include "gc_implementation/shared/gcTrace.hpp" |
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#include "gc_implementation/shared/gcTraceTime.hpp" |
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#include "gc_implementation/shared/isGCActiveMark.hpp" |
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#include "gc_implementation/shared/markSweep.hpp" |
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#include "gc_implementation/shared/spaceDecorator.hpp" |
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#include "gc_interface/gcCause.hpp" |
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#include "memory/gcLocker.inline.hpp" |
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#include "memory/referencePolicy.hpp" |
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#include "memory/referenceProcessor.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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PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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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 = Universe::heap()->reserved_region(); |
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_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(!Universe::heap()->is_gc_active(), "not reentrant"); |
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ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::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 (GC_locker::check_active_before_gc()) { |
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return false; |
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} |
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ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
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assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
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GCCause::Cause gc_cause = heap->gc_cause(); |
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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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AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); |
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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(" VerifyBeforeGC:"); |
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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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heap->pre_full_gc_dump(_gc_timer); |
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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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gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
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TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
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GCTraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, NULL, _gc_tracer->gc_id()); |
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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(); |
1 | 178 |
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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 heap size before collection for printing. |
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size_t prev_used = heap->used(); |
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// Capture metadata size before collection for sizing. |
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size_t metadata_prev_used = MetaspaceAux::used_bytes(); |
1 | 190 |
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191 |
// For PrintGCDetails |
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192 |
size_t old_gen_prev_used = old_gen->used_in_bytes(); |
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193 |
size_t young_gen_prev_used = young_gen->used_in_bytes(); |
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194 |
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195 |
allocate_stacks(); |
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196 |
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197 |
COMPILER2_PRESENT(DerivedPointerTable::clear()); |
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ref_processor()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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ref_processor()->setup_policy(clear_all_softrefs); |
1 | 201 |
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202 |
mark_sweep_phase1(clear_all_softrefs); |
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203 |
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204 |
mark_sweep_phase2(); |
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205 |
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206 |
// Don't add any more derived pointers during phase3 |
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207 |
COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); |
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208 |
COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); |
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209 |
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210 |
mark_sweep_phase3(); |
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211 |
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212 |
mark_sweep_phase4(); |
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213 |
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214 |
restore_marks(); |
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215 |
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216 |
deallocate_stacks(); |
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217 |
||
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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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223 |
|
1 | 224 |
eden_empty = young_gen->eden_space()->is_empty(); |
225 |
if (!eden_empty) { |
|
226 |
eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); |
|
227 |
} |
|
228 |
||
229 |
// Update heap occupancy information which is used as |
|
230 |
// input to soft ref clearing policy at the next gc. |
|
231 |
Universe::update_heap_info_at_gc(); |
|
232 |
||
233 |
survivors_empty = young_gen->from_space()->is_empty() && |
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young_gen->to_space()->is_empty(); |
1 | 235 |
young_gen_empty = eden_empty && survivors_empty; |
236 |
||
237 |
BarrierSet* bs = heap->barrier_set(); |
|
238 |
if (bs->is_a(BarrierSet::ModRef)) { |
|
239 |
ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; |
|
240 |
MemRegion old_mr = heap->old_gen()->reserved(); |
|
241 |
if (young_gen_empty) { |
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modBS->clear(MemRegion(old_mr.start(), old_mr.end())); |
1 | 243 |
} else { |
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modBS->invalidate(MemRegion(old_mr.start(), old_mr.end())); |
1 | 245 |
} |
246 |
} |
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247 |
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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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1 | 252 |
BiasedLocking::restore_marks(); |
253 |
CodeCache::gc_epilogue(); |
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|
254 |
JvmtiExport::gc_epilogue(); |
1 | 255 |
|
256 |
COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
|
257 |
||
258 |
ref_processor()->enqueue_discovered_references(NULL); |
|
259 |
||
260 |
// Update time of last GC |
|
261 |
reset_millis_since_last_gc(); |
|
262 |
||
263 |
// Let the size policy know we're done |
|
264 |
size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); |
|
265 |
||
266 |
if (UseAdaptiveSizePolicy) { |
|
267 |
||
268 |
if (PrintAdaptiveSizePolicy) { |
|
269 |
gclog_or_tty->print("AdaptiveSizeStart: "); |
|
270 |
gclog_or_tty->stamp(); |
|
271 |
gclog_or_tty->print_cr(" collection: %d ", |
|
272 |
heap->total_collections()); |
|
273 |
if (Verbose) { |
|
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|
274 |
gclog_or_tty->print("old_gen_capacity: " SIZE_FORMAT |
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275 |
" young_gen_capacity: " SIZE_FORMAT, |
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|
276 |
old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes()); |
1 | 277 |
} |
278 |
} |
|
279 |
||
280 |
// Don't check if the size_policy is ready here. Let |
|
281 |
// the size_policy check that internally. |
|
282 |
if (UseAdaptiveGenerationSizePolicyAtMajorCollection && |
|
283 |
((gc_cause != GCCause::_java_lang_system_gc) || |
|
284 |
UseAdaptiveSizePolicyWithSystemGC)) { |
|
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|
285 |
// Swap the survivor spaces if from_space is empty. The |
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|
286 |
// resize_young_gen() called below is normally used after |
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|
287 |
// a successful young GC and swapping of survivor spaces; |
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|
288 |
// otherwise, it will fail to resize the young gen with |
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|
289 |
// the current implementation. |
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|
290 |
if (young_gen->from_space()->is_empty()) { |
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|
291 |
young_gen->from_space()->clear(SpaceDecorator::Mangle); |
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|
292 |
young_gen->swap_spaces(); |
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|
293 |
} |
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|
294 |
|
1 | 295 |
// Calculate optimal free space amounts |
296 |
assert(young_gen->max_size() > |
|
297 |
young_gen->from_space()->capacity_in_bytes() + |
|
298 |
young_gen->to_space()->capacity_in_bytes(), |
|
299 |
"Sizes of space in young gen are out-of-bounds"); |
|
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|
300 |
|
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|
301 |
size_t young_live = young_gen->used_in_bytes(); |
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|
302 |
size_t eden_live = young_gen->eden_space()->used_in_bytes(); |
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|
303 |
size_t old_live = old_gen->used_in_bytes(); |
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|
304 |
size_t cur_eden = young_gen->eden_space()->capacity_in_bytes(); |
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|
305 |
size_t max_old_gen_size = old_gen->max_gen_size(); |
1 | 306 |
size_t max_eden_size = young_gen->max_size() - |
307 |
young_gen->from_space()->capacity_in_bytes() - |
|
308 |
young_gen->to_space()->capacity_in_bytes(); |
|
17393
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|
309 |
|
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|
310 |
// Used for diagnostics |
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|
311 |
size_policy->clear_generation_free_space_flags(); |
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|
312 |
|
17842
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changeset
|
313 |
size_policy->compute_generations_free_space(young_live, |
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diff
changeset
|
314 |
eden_live, |
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diff
changeset
|
315 |
old_live, |
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diff
changeset
|
316 |
cur_eden, |
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|
317 |
max_old_gen_size, |
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diff
changeset
|
318 |
max_eden_size, |
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diff
changeset
|
319 |
true /* full gc*/); |
17393
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diff
changeset
|
320 |
|
7e99f263902c
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parents:
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diff
changeset
|
321 |
size_policy->check_gc_overhead_limit(young_live, |
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diff
changeset
|
322 |
eden_live, |
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8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
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parents:
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diff
changeset
|
323 |
max_old_gen_size, |
7e99f263902c
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
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diff
changeset
|
324 |
max_eden_size, |
7e99f263902c
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
parents:
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diff
changeset
|
325 |
true /* full gc*/, |
7e99f263902c
8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
tamao
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diff
changeset
|
326 |
gc_cause, |
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8007763: Refactoring: split up compute_generation_free_space() into two functions for class PSAdaptiveSizePolicy
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diff
changeset
|
327 |
heap->collector_policy()); |
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diff
changeset
|
328 |
|
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diff
changeset
|
329 |
size_policy->decay_supplemental_growth(true /* full gc*/); |
1 | 330 |
|
331 |
heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); |
|
332 |
||
23226
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diff
changeset
|
333 |
heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(), |
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diff
changeset
|
334 |
size_policy->calculated_survivor_size_in_bytes()); |
1 | 335 |
} |
336 |
if (PrintAdaptiveSizePolicy) { |
|
337 |
gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", |
|
338 |
heap->total_collections()); |
|
339 |
} |
|
340 |
} |
|
341 |
||
342 |
if (UsePerfData) { |
|
343 |
heap->gc_policy_counters()->update_counters(); |
|
344 |
heap->gc_policy_counters()->update_old_capacity( |
|
345 |
old_gen->capacity_in_bytes()); |
|
346 |
heap->gc_policy_counters()->update_young_capacity( |
|
347 |
young_gen->capacity_in_bytes()); |
|
348 |
} |
|
349 |
||
350 |
heap->resize_all_tlabs(); |
|
351 |
||
13728
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parents:
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diff
changeset
|
352 |
// We collected the heap, recalculate the metaspace capacity |
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|
353 |
MetaspaceGC::compute_new_size(); |
1 | 354 |
|
24941
4ebbe176a7b1
8042298: Remove the names gen0 and gen1 from the GC code
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diff
changeset
|
355 |
if (TraceOldGenTime) accumulated_time()->stop(); |
1 | 356 |
|
357 |
if (PrintGC) { |
|
358 |
if (PrintGCDetails) { |
|
359 |
// Don't print a GC timestamp here. This is after the GC so |
|
360 |
// would be confusing. |
|
361 |
young_gen->print_used_change(young_gen_prev_used); |
|
362 |
old_gen->print_used_change(old_gen_prev_used); |
|
363 |
} |
|
364 |
heap->print_heap_change(prev_used); |
|
365 |
if (PrintGCDetails) { |
|
13728
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diff
changeset
|
366 |
MetaspaceAux::print_metaspace_change(metadata_prev_used); |
1 | 367 |
} |
368 |
} |
|
369 |
||
370 |
// Track memory usage and detect low memory |
|
371 |
MemoryService::track_memory_usage(); |
|
372 |
heap->update_counters(); |
|
373 |
} |
|
374 |
||
375 |
if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { |
|
376 |
HandleMark hm; // Discard invalid handles created during verification |
|
17112
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8013132: Add a flag to turn off the output of the verbose verification code
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diff
changeset
|
377 |
Universe::verify(" VerifyAfterGC:"); |
1 | 378 |
} |
379 |
||
380 |
// Re-verify object start arrays |
|
381 |
if (VerifyObjectStartArray && |
|
382 |
VerifyAfterGC) { |
|
383 |
old_gen->verify_object_start_array(); |
|
384 |
} |
|
385 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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diff
changeset
|
386 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
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diff
changeset
|
387 |
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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diff
changeset
|
388 |
} |
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diff
changeset
|
389 |
|
1 | 390 |
NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
391 |
||
11636
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|
392 |
heap->print_heap_after_gc(); |
18025 | 393 |
heap->trace_heap_after_gc(_gc_tracer); |
2010
c13462bbad17
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diff
changeset
|
394 |
|
18025 | 395 |
heap->post_full_gc_dump(_gc_timer); |
2141
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
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diff
changeset
|
396 |
|
2010
c13462bbad17
6690928: Use spinning in combination with yields for workstealing termination.
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diff
changeset
|
397 |
#ifdef TRACESPINNING |
c13462bbad17
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diff
changeset
|
398 |
ParallelTaskTerminator::print_termination_counts(); |
c13462bbad17
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diff
changeset
|
399 |
#endif |
11757
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changeset
|
400 |
|
21767
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8028128: Add a type safe alternative for working with counter based data
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parents:
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diff
changeset
|
401 |
_gc_timer->register_gc_end(); |
18025 | 402 |
|
403 |
_gc_tracer->report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions()); |
|
404 |
||
11757
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diff
changeset
|
405 |
return true; |
1 | 406 |
} |
407 |
||
408 |
bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, |
|
409 |
PSYoungGen* young_gen, |
|
410 |
PSOldGen* old_gen) { |
|
411 |
MutableSpace* const eden_space = young_gen->eden_space(); |
|
412 |
assert(!eden_space->is_empty(), "eden must be non-empty"); |
|
413 |
assert(young_gen->virtual_space()->alignment() == |
|
414 |
old_gen->virtual_space()->alignment(), "alignments do not match"); |
|
415 |
||
416 |
if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { |
|
417 |
return false; |
|
418 |
} |
|
419 |
||
420 |
// Both generations must be completely committed. |
|
421 |
if (young_gen->virtual_space()->uncommitted_size() != 0) { |
|
422 |
return false; |
|
423 |
} |
|
424 |
if (old_gen->virtual_space()->uncommitted_size() != 0) { |
|
425 |
return false; |
|
426 |
} |
|
427 |
||
428 |
// Figure out how much to take from eden. Include the average amount promoted |
|
429 |
// in the total; otherwise the next young gen GC will simply bail out to a |
|
430 |
// full GC. |
|
431 |
const size_t alignment = old_gen->virtual_space()->alignment(); |
|
432 |
const size_t eden_used = eden_space->used_in_bytes(); |
|
1668
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diff
changeset
|
433 |
const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
1 | 434 |
const size_t absorb_size = align_size_up(eden_used + promoted, alignment); |
435 |
const size_t eden_capacity = eden_space->capacity_in_bytes(); |
|
436 |
||
437 |
if (absorb_size >= eden_capacity) { |
|
438 |
return false; // Must leave some space in eden. |
|
439 |
} |
|
440 |
||
441 |
const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; |
|
442 |
if (new_young_size < young_gen->min_gen_size()) { |
|
443 |
return false; // Respect young gen minimum size. |
|
444 |
} |
|
445 |
||
446 |
if (TraceAdaptiveGCBoundary && Verbose) { |
|
447 |
gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " |
|
448 |
"eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " |
|
449 |
"from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " |
|
450 |
"young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", |
|
451 |
absorb_size / K, |
|
452 |
eden_capacity / K, (eden_capacity - absorb_size) / K, |
|
453 |
young_gen->from_space()->used_in_bytes() / K, |
|
454 |
young_gen->to_space()->used_in_bytes() / K, |
|
455 |
young_gen->capacity_in_bytes() / K, new_young_size / K); |
|
456 |
} |
|
457 |
||
458 |
// Fill the unused part of the old gen. |
|
459 |
MutableSpace* const old_space = old_gen->object_space(); |
|
1668
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jcoomes
parents:
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diff
changeset
|
460 |
HeapWord* const unused_start = old_space->top(); |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
461 |
size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
1 | 462 |
|
1668
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
463 |
if (unused_words > 0) { |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
464 |
if (unused_words < CollectedHeap::min_fill_size()) { |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
465 |
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
|
466 |
} |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
467 |
CollectedHeap::fill_with_objects(unused_start, unused_words); |
1 | 468 |
} |
469 |
||
470 |
// Take the live data from eden and set both top and end in the old gen to |
|
471 |
// eden top. (Need to set end because reset_after_change() mangles the region |
|
472 |
// from end to virtual_space->high() in debug builds). |
|
473 |
HeapWord* const new_top = eden_space->top(); |
|
474 |
old_gen->virtual_space()->expand_into(young_gen->virtual_space(), |
|
475 |
absorb_size); |
|
476 |
young_gen->reset_after_change(); |
|
477 |
old_space->set_top(new_top); |
|
478 |
old_space->set_end(new_top); |
|
479 |
old_gen->reset_after_change(); |
|
480 |
||
481 |
// Update the object start array for the filler object and the data from eden. |
|
482 |
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
|
483 |
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
|
484 |
start_array->allocate_block(p); |
1 | 485 |
} |
486 |
||
487 |
// Could update the promoted average here, but it is not typically updated at |
|
488 |
// full GCs and the value to use is unclear. Something like |
|
489 |
// |
|
490 |
// cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. |
|
491 |
||
492 |
size_policy->set_bytes_absorbed_from_eden(absorb_size); |
|
493 |
return true; |
|
494 |
} |
|
495 |
||
496 |
void PSMarkSweep::allocate_stacks() { |
|
497 |
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
|
498 |
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
|
499 |
||
500 |
PSYoungGen* young_gen = heap->young_gen(); |
|
501 |
||
502 |
MutableSpace* to_space = young_gen->to_space(); |
|
503 |
_preserved_marks = (PreservedMark*)to_space->top(); |
|
504 |
_preserved_count = 0; |
|
505 |
||
506 |
// We want to calculate the size in bytes first. |
|
507 |
_preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); |
|
508 |
// Now divide by the size of a PreservedMark |
|
509 |
_preserved_count_max /= sizeof(PreservedMark); |
|
510 |
} |
|
511 |
||
512 |
||
513 |
void PSMarkSweep::deallocate_stacks() { |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
514 |
_preserved_mark_stack.clear(true); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
515 |
_preserved_oop_stack.clear(true); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
516 |
_marking_stack.clear(); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
517 |
_objarray_stack.clear(true); |
1 | 518 |
} |
519 |
||
520 |
void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { |
|
521 |
// Recursively traverse all live objects and mark them |
|
25350
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
24941
diff
changeset
|
522 |
GCTraceTime tm("phase 1", PrintGCDetails && Verbose, true, _gc_timer, _gc_tracer->gc_id()); |
1 | 523 |
trace(" 1"); |
524 |
||
525 |
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
|
526 |
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
|
527 |
||
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
528 |
// 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
|
529 |
ClassLoaderDataGraph::clear_claimed_marks(); |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
530 |
|
1 | 531 |
// General strong roots. |
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
532 |
{ |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
533 |
ParallelScavengeHeap::ParStrongRootsScope psrs; |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
534 |
Universe::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
535 |
JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles |
14582
490bb6c0df7c
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
14076
diff
changeset
|
536 |
CLDToOopClosure mark_and_push_from_cld(mark_and_push_closure()); |
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
537 |
MarkingCodeBlobClosure each_active_code_blob(mark_and_push_closure(), !CodeBlobToOopClosure::FixRelocations); |
14582
490bb6c0df7c
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
14076
diff
changeset
|
538 |
Threads::oops_do(mark_and_push_closure(), &mark_and_push_from_cld, &each_active_code_blob); |
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
539 |
ObjectSynchronizer::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
540 |
FlatProfiler::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
541 |
Management::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
542 |
JvmtiExport::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
543 |
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
|
544 |
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
|
545 |
// 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
|
546 |
//CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure())); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
547 |
} |
1 | 548 |
|
549 |
// Flush marking stack. |
|
550 |
follow_stack(); |
|
551 |
||
552 |
// Process reference objects found during marking |
|
553 |
{ |
|
1610
5dddd195cc86
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
1606
diff
changeset
|
554 |
ref_processor()->setup_policy(clear_all_softrefs); |
18025 | 555 |
const ReferenceProcessorStats& stats = |
556 |
ref_processor()->process_discovered_references( |
|
25350
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
24941
diff
changeset
|
557 |
is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL, _gc_timer, _gc_tracer->gc_id()); |
18025 | 558 |
gc_tracer()->report_gc_reference_stats(stats); |
1 | 559 |
} |
560 |
||
17114
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17112
diff
changeset
|
561 |
// 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
|
562 |
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
|
563 |
|
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17112
diff
changeset
|
564 |
// Unload classes and purge the SystemDictionary. |
1 | 565 |
bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); |
566 |
||
17114
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17112
diff
changeset
|
567 |
// Unload nmethods. |
13878
6e6a462a6cff
7200470: KeepAliveClosure not needed in CodeCache::do_unloading
brutisso
parents:
13728
diff
changeset
|
568 |
CodeCache::do_unloading(is_alive_closure(), purged_class); |
1 | 569 |
|
17114
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17112
diff
changeset
|
570 |
// Prune dead klasses from subklass/sibling/implementor lists. |
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17112
diff
changeset
|
571 |
Klass::clean_weak_klass_links(is_alive_closure()); |
3696 | 572 |
|
17114
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17112
diff
changeset
|
573 |
// Delete entries for dead interned strings. |
1 | 574 |
StringTable::unlink(is_alive_closure()); |
17114
b341b4c63384
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
17112
diff
changeset
|
575 |
|
8076
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7918
diff
changeset
|
576 |
// Clean up unreferenced symbols in symbol table. |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7918
diff
changeset
|
577 |
SymbolTable::unlink(); |
18025 | 578 |
_gc_tracer->report_object_count_after_gc(is_alive_closure()); |
1 | 579 |
} |
580 |
||
581 |
||
582 |
void PSMarkSweep::mark_sweep_phase2() { |
|
25350
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
24941
diff
changeset
|
583 |
GCTraceTime tm("phase 2", PrintGCDetails && Verbose, true, _gc_timer, _gc_tracer->gc_id()); |
1 | 584 |
trace("2"); |
585 |
||
586 |
// Now all live objects are marked, compute the new object addresses. |
|
587 |
||
588 |
// It is not required that we traverse spaces in the same order in |
|
589 |
// phase2, phase3 and phase4, but the ValidateMarkSweep live oops |
|
590 |
// tracking expects us to do so. See comment under phase4. |
|
591 |
||
592 |
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
|
593 |
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
|
594 |
||
595 |
PSOldGen* old_gen = heap->old_gen(); |
|
596 |
||
597 |
// Begin compacting into the old gen |
|
598 |
PSMarkSweepDecorator::set_destination_decorator_tenured(); |
|
599 |
||
600 |
// This will also compact the young gen spaces. |
|
601 |
old_gen->precompact(); |
|
602 |
} |
|
603 |
||
604 |
// This should be moved to the shared markSweep code! |
|
605 |
class PSAlwaysTrueClosure: public BoolObjectClosure { |
|
606 |
public: |
|
607 |
bool do_object_b(oop p) { return true; } |
|
608 |
}; |
|
609 |
static PSAlwaysTrueClosure always_true; |
|
610 |
||
611 |
void PSMarkSweep::mark_sweep_phase3() { |
|
612 |
// Adjust the pointers to reflect the new locations |
|
25350
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
24941
diff
changeset
|
613 |
GCTraceTime tm("phase 3", PrintGCDetails && Verbose, true, _gc_timer, _gc_tracer->gc_id()); |
1 | 614 |
trace("3"); |
615 |
||
616 |
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
|
617 |
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
|
618 |
||
619 |
PSYoungGen* young_gen = heap->young_gen(); |
|
620 |
PSOldGen* old_gen = heap->old_gen(); |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
621 |
|
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12630
diff
changeset
|
622 |
// 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
|
623 |
ClassLoaderDataGraph::clear_claimed_marks(); |
1 | 624 |
|
625 |
// General strong roots. |
|
17105
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
626 |
Universe::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
627 |
JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
628 |
CLDToOopClosure adjust_from_cld(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
629 |
Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
630 |
ObjectSynchronizer::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
631 |
FlatProfiler::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
632 |
Management::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
633 |
JvmtiExport::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
634 |
SystemDictionary::oops_do(adjust_pointer_closure()); |
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
635 |
ClassLoaderDataGraph::cld_do(adjust_cld_closure()); |
1 | 636 |
|
637 |
// Now adjust pointers in remaining weak roots. (All of which should |
|
638 |
// have been cleared if they pointed to non-surviving objects.) |
|
639 |
// Global (weak) JNI handles |
|
17105
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
640 |
JNIHandles::weak_oops_do(&always_true, adjust_pointer_closure()); |
1 | 641 |
|
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
642 |
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
|
643 |
CodeCache::blobs_do(&adjust_from_blobs); |
17105
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
644 |
StringTable::oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
645 |
ref_processor()->weak_oops_do(adjust_pointer_closure()); |
25b392a7740d
8012687: Remove unused is_root checks and closures
stefank
parents:
14582
diff
changeset
|
646 |
PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure()); |
1 | 647 |
|
648 |
adjust_marks(); |
|
649 |
||
650 |
young_gen->adjust_pointers(); |
|
651 |
old_gen->adjust_pointers(); |
|
652 |
} |
|
653 |
||
654 |
void PSMarkSweep::mark_sweep_phase4() { |
|
655 |
EventMark m("4 compact heap"); |
|
25350
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
24941
diff
changeset
|
656 |
GCTraceTime tm("phase 4", PrintGCDetails && Verbose, true, _gc_timer, _gc_tracer->gc_id()); |
1 | 657 |
trace("4"); |
658 |
||
659 |
// All pointers are now adjusted, move objects accordingly |
|
660 |
||
661 |
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
|
662 |
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
|
663 |
||
664 |
PSYoungGen* young_gen = heap->young_gen(); |
|
665 |
PSOldGen* old_gen = heap->old_gen(); |
|
666 |
||
667 |
old_gen->compact(); |
|
668 |
young_gen->compact(); |
|
669 |
} |
|
670 |
||
671 |
jlong PSMarkSweep::millis_since_last_gc() { |
|
22551 | 672 |
// 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
|
673 |
// 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
|
674 |
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
|
675 |
jlong ret_val = now - _time_of_last_gc; |
1 | 676 |
// XXX See note in genCollectedHeap::millis_since_last_gc(). |
677 |
if (ret_val < 0) { |
|
11251
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
10670
diff
changeset
|
678 |
NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
1 | 679 |
return 0; |
680 |
} |
|
681 |
return ret_val; |
|
682 |
} |
|
683 |
||
684 |
void PSMarkSweep::reset_millis_since_last_gc() { |
|
22551 | 685 |
// 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
|
686 |
// 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
|
687 |
_time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
1 | 688 |
} |