author | johnc |
Mon, 19 Dec 2011 10:02:05 -0800 | |
changeset 11251 | e29da6b5622b |
parent 10670 | 4ea0e7d2ffbc |
child 11636 | 3c07b54482a5 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2001, 2011, 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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#include "precompiled.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_implementation/parallelScavenge/generationSizer.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/psPermGen.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/isGCActiveMark.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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elapsedTimer PSMarkSweep::_accumulated_time; |
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unsigned int PSMarkSweep::_total_invocations = 0; |
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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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int count = (maximum_heap_compaction)?1:MarkSweepAlwaysCompactCount; |
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IntFlagSetting 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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void 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; |
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} |
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ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
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GCCause::Cause gc_cause = heap->gc_cause(); |
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assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
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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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PSPermGen* perm_gen = heap->perm_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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if (PrintHeapAtGC) { |
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Universe::print_heap_before_gc(); |
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} |
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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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gclog_or_tty->print(" VerifyBeforeGC:"); |
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Universe::verify(true); |
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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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perm_gen->verify_object_start_array(); |
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} |
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heap->pre_full_gc_dump(); |
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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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const bool is_system_gc = gc_cause == GCCause::_java_lang_system_gc; |
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// This is useful for debugging but don't change the output the |
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// the customer sees. |
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const char* gc_cause_str = "Full GC"; |
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if (is_system_gc && PrintGCDetails) { |
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gc_cause_str = "Full GC (System)"; |
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} |
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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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TraceTime t1(gc_cause_str, PrintGC, !PrintGCDetails, gclog_or_tty); |
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TraceCollectorStats tcs(counters()); |
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TraceMemoryManagerStats tms(true /* Full GC */,gc_cause); |
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if (TraceGen1Time) 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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// When collecting the permanent generation methodOops may be moving, |
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// so we either have to flush all bcp data or convert it into bci. |
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CodeCache::gc_prologue(); |
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Threads::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 perm gen size before collection for sizing. |
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size_t perm_gen_prev_used = perm_gen->used_in_bytes(); |
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// For PrintGCDetails |
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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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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); |
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mark_sweep_phase1(clear_all_softrefs); |
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mark_sweep_phase2(); |
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209 |
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// Don't add any more derived pointers during phase3 |
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COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); |
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COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); |
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mark_sweep_phase3(); |
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215 |
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216 |
mark_sweep_phase4(); |
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restore_marks(); |
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deallocate_stacks(); |
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if (ZapUnusedHeapArea) { |
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// Do a complete mangle (top to end) because the usage for |
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// scratch does not maintain a top pointer. |
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young_gen->to_space()->mangle_unused_area_complete(); |
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} |
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eden_empty = young_gen->eden_space()->is_empty(); |
229 |
if (!eden_empty) { |
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230 |
eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen); |
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231 |
} |
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233 |
// Update heap occupancy information which is used as |
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234 |
// input to soft ref clearing policy at the next gc. |
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Universe::update_heap_info_at_gc(); |
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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; |
240 |
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241 |
BarrierSet* bs = heap->barrier_set(); |
|
242 |
if (bs->is_a(BarrierSet::ModRef)) { |
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243 |
ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; |
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244 |
MemRegion old_mr = heap->old_gen()->reserved(); |
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245 |
MemRegion perm_mr = heap->perm_gen()->reserved(); |
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246 |
assert(perm_mr.end() <= old_mr.start(), "Generations out of order"); |
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247 |
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248 |
if (young_gen_empty) { |
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249 |
modBS->clear(MemRegion(perm_mr.start(), old_mr.end())); |
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250 |
} else { |
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251 |
modBS->invalidate(MemRegion(perm_mr.start(), old_mr.end())); |
|
252 |
} |
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253 |
} |
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254 |
||
255 |
BiasedLocking::restore_marks(); |
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256 |
Threads::gc_epilogue(); |
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257 |
CodeCache::gc_epilogue(); |
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JvmtiExport::gc_epilogue(); |
1 | 259 |
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260 |
COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
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261 |
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262 |
ref_processor()->enqueue_discovered_references(NULL); |
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263 |
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264 |
// Update time of last GC |
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265 |
reset_millis_since_last_gc(); |
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266 |
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267 |
// Let the size policy know we're done |
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268 |
size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); |
|
269 |
||
270 |
if (UseAdaptiveSizePolicy) { |
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271 |
||
272 |
if (PrintAdaptiveSizePolicy) { |
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273 |
gclog_or_tty->print("AdaptiveSizeStart: "); |
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274 |
gclog_or_tty->stamp(); |
|
275 |
gclog_or_tty->print_cr(" collection: %d ", |
|
276 |
heap->total_collections()); |
|
277 |
if (Verbose) { |
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278 |
gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d" |
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279 |
" perm_gen_capacity: %d ", |
|
280 |
old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes(), |
|
281 |
perm_gen->capacity_in_bytes()); |
|
282 |
} |
|
283 |
} |
|
284 |
||
285 |
// Don't check if the size_policy is ready here. Let |
|
286 |
// the size_policy check that internally. |
|
287 |
if (UseAdaptiveGenerationSizePolicyAtMajorCollection && |
|
288 |
((gc_cause != GCCause::_java_lang_system_gc) || |
|
289 |
UseAdaptiveSizePolicyWithSystemGC)) { |
|
290 |
// Calculate optimal free space amounts |
|
291 |
assert(young_gen->max_size() > |
|
292 |
young_gen->from_space()->capacity_in_bytes() + |
|
293 |
young_gen->to_space()->capacity_in_bytes(), |
|
294 |
"Sizes of space in young gen are out-of-bounds"); |
|
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(); |
|
298 |
size_policy->compute_generation_free_space(young_gen->used_in_bytes(), |
|
299 |
young_gen->eden_space()->used_in_bytes(), |
|
300 |
old_gen->used_in_bytes(), |
|
301 |
perm_gen->used_in_bytes(), |
|
302 |
young_gen->eden_space()->capacity_in_bytes(), |
|
303 |
old_gen->max_gen_size(), |
|
304 |
max_eden_size, |
|
305 |
true /* full gc*/, |
|
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
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5076
diff
changeset
|
306 |
gc_cause, |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
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5076
diff
changeset
|
307 |
heap->collector_policy()); |
1 | 308 |
|
309 |
heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes()); |
|
310 |
||
311 |
// Don't resize the young generation at an major collection. A |
|
312 |
// desired young generation size may have been calculated but |
|
313 |
// resizing the young generation complicates the code because the |
|
314 |
// resizing of the old generation may have moved the boundary |
|
315 |
// between the young generation and the old generation. Let the |
|
316 |
// young generation resizing happen at the minor collections. |
|
317 |
} |
|
318 |
if (PrintAdaptiveSizePolicy) { |
|
319 |
gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", |
|
320 |
heap->total_collections()); |
|
321 |
} |
|
322 |
} |
|
323 |
||
324 |
if (UsePerfData) { |
|
325 |
heap->gc_policy_counters()->update_counters(); |
|
326 |
heap->gc_policy_counters()->update_old_capacity( |
|
327 |
old_gen->capacity_in_bytes()); |
|
328 |
heap->gc_policy_counters()->update_young_capacity( |
|
329 |
young_gen->capacity_in_bytes()); |
|
330 |
} |
|
331 |
||
332 |
heap->resize_all_tlabs(); |
|
333 |
||
334 |
// We collected the perm gen, so we'll resize it here. |
|
335 |
perm_gen->compute_new_size(perm_gen_prev_used); |
|
336 |
||
337 |
if (TraceGen1Time) accumulated_time()->stop(); |
|
338 |
||
339 |
if (PrintGC) { |
|
340 |
if (PrintGCDetails) { |
|
341 |
// Don't print a GC timestamp here. This is after the GC so |
|
342 |
// would be confusing. |
|
343 |
young_gen->print_used_change(young_gen_prev_used); |
|
344 |
old_gen->print_used_change(old_gen_prev_used); |
|
345 |
} |
|
346 |
heap->print_heap_change(prev_used); |
|
347 |
// Do perm gen after heap becase prev_used does |
|
348 |
// not include the perm gen (done this way in the other |
|
349 |
// collectors). |
|
350 |
if (PrintGCDetails) { |
|
351 |
perm_gen->print_used_change(perm_gen_prev_used); |
|
352 |
} |
|
353 |
} |
|
354 |
||
355 |
// Track memory usage and detect low memory |
|
356 |
MemoryService::track_memory_usage(); |
|
357 |
heap->update_counters(); |
|
358 |
} |
|
359 |
||
360 |
if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { |
|
361 |
HandleMark hm; // Discard invalid handles created during verification |
|
362 |
gclog_or_tty->print(" VerifyAfterGC:"); |
|
363 |
Universe::verify(false); |
|
364 |
} |
|
365 |
||
366 |
// Re-verify object start arrays |
|
367 |
if (VerifyObjectStartArray && |
|
368 |
VerifyAfterGC) { |
|
369 |
old_gen->verify_object_start_array(); |
|
370 |
perm_gen->verify_object_start_array(); |
|
371 |
} |
|
372 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
1
diff
changeset
|
373 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
1
diff
changeset
|
374 |
old_gen->object_space()->check_mangled_unused_area_complete(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
1
diff
changeset
|
375 |
perm_gen->object_space()->check_mangled_unused_area_complete(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
1
diff
changeset
|
376 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
1
diff
changeset
|
377 |
|
1 | 378 |
NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
379 |
||
380 |
if (PrintHeapAtGC) { |
|
381 |
Universe::print_heap_after_gc(); |
|
382 |
} |
|
2010
c13462bbad17
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
1668
diff
changeset
|
383 |
|
2141
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
2010
diff
changeset
|
384 |
heap->post_full_gc_dump(); |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
2010
diff
changeset
|
385 |
|
2010
c13462bbad17
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
1668
diff
changeset
|
386 |
#ifdef TRACESPINNING |
c13462bbad17
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
1668
diff
changeset
|
387 |
ParallelTaskTerminator::print_termination_counts(); |
c13462bbad17
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
1668
diff
changeset
|
388 |
#endif |
1 | 389 |
} |
390 |
||
391 |
bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, |
|
392 |
PSYoungGen* young_gen, |
|
393 |
PSOldGen* old_gen) { |
|
394 |
MutableSpace* const eden_space = young_gen->eden_space(); |
|
395 |
assert(!eden_space->is_empty(), "eden must be non-empty"); |
|
396 |
assert(young_gen->virtual_space()->alignment() == |
|
397 |
old_gen->virtual_space()->alignment(), "alignments do not match"); |
|
398 |
||
399 |
if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { |
|
400 |
return false; |
|
401 |
} |
|
402 |
||
403 |
// Both generations must be completely committed. |
|
404 |
if (young_gen->virtual_space()->uncommitted_size() != 0) { |
|
405 |
return false; |
|
406 |
} |
|
407 |
if (old_gen->virtual_space()->uncommitted_size() != 0) { |
|
408 |
return false; |
|
409 |
} |
|
410 |
||
411 |
// Figure out how much to take from eden. Include the average amount promoted |
|
412 |
// in the total; otherwise the next young gen GC will simply bail out to a |
|
413 |
// full GC. |
|
414 |
const size_t alignment = old_gen->virtual_space()->alignment(); |
|
415 |
const size_t eden_used = eden_space->used_in_bytes(); |
|
1668
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
416 |
const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); |
1 | 417 |
const size_t absorb_size = align_size_up(eden_used + promoted, alignment); |
418 |
const size_t eden_capacity = eden_space->capacity_in_bytes(); |
|
419 |
||
420 |
if (absorb_size >= eden_capacity) { |
|
421 |
return false; // Must leave some space in eden. |
|
422 |
} |
|
423 |
||
424 |
const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; |
|
425 |
if (new_young_size < young_gen->min_gen_size()) { |
|
426 |
return false; // Respect young gen minimum size. |
|
427 |
} |
|
428 |
||
429 |
if (TraceAdaptiveGCBoundary && Verbose) { |
|
430 |
gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " |
|
431 |
"eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " |
|
432 |
"from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " |
|
433 |
"young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", |
|
434 |
absorb_size / K, |
|
435 |
eden_capacity / K, (eden_capacity - absorb_size) / K, |
|
436 |
young_gen->from_space()->used_in_bytes() / K, |
|
437 |
young_gen->to_space()->used_in_bytes() / K, |
|
438 |
young_gen->capacity_in_bytes() / K, new_young_size / K); |
|
439 |
} |
|
440 |
||
441 |
// Fill the unused part of the old gen. |
|
442 |
MutableSpace* const old_space = old_gen->object_space(); |
|
1668
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
443 |
HeapWord* const unused_start = old_space->top(); |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
444 |
size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
1 | 445 |
|
1668
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
446 |
if (unused_words > 0) { |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
447 |
if (unused_words < CollectedHeap::min_fill_size()) { |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
448 |
return false; // If the old gen cannot be filled, must give up. |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
449 |
} |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
450 |
CollectedHeap::fill_with_objects(unused_start, unused_words); |
1 | 451 |
} |
452 |
||
453 |
// Take the live data from eden and set both top and end in the old gen to |
|
454 |
// eden top. (Need to set end because reset_after_change() mangles the region |
|
455 |
// from end to virtual_space->high() in debug builds). |
|
456 |
HeapWord* const new_top = eden_space->top(); |
|
457 |
old_gen->virtual_space()->expand_into(young_gen->virtual_space(), |
|
458 |
absorb_size); |
|
459 |
young_gen->reset_after_change(); |
|
460 |
old_space->set_top(new_top); |
|
461 |
old_space->set_end(new_top); |
|
462 |
old_gen->reset_after_change(); |
|
463 |
||
464 |
// Update the object start array for the filler object and the data from eden. |
|
465 |
ObjectStartArray* const start_array = old_gen->start_array(); |
|
1668
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
466 |
for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1610
diff
changeset
|
467 |
start_array->allocate_block(p); |
1 | 468 |
} |
469 |
||
470 |
// Could update the promoted average here, but it is not typically updated at |
|
471 |
// full GCs and the value to use is unclear. Something like |
|
472 |
// |
|
473 |
// cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. |
|
474 |
||
475 |
size_policy->set_bytes_absorbed_from_eden(absorb_size); |
|
476 |
return true; |
|
477 |
} |
|
478 |
||
479 |
void PSMarkSweep::allocate_stacks() { |
|
480 |
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
|
481 |
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
|
482 |
||
483 |
PSYoungGen* young_gen = heap->young_gen(); |
|
484 |
||
485 |
MutableSpace* to_space = young_gen->to_space(); |
|
486 |
_preserved_marks = (PreservedMark*)to_space->top(); |
|
487 |
_preserved_count = 0; |
|
488 |
||
489 |
// We want to calculate the size in bytes first. |
|
490 |
_preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte)); |
|
491 |
// Now divide by the size of a PreservedMark |
|
492 |
_preserved_count_max /= sizeof(PreservedMark); |
|
493 |
} |
|
494 |
||
495 |
||
496 |
void PSMarkSweep::deallocate_stacks() { |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
497 |
_preserved_mark_stack.clear(true); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
498 |
_preserved_oop_stack.clear(true); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
499 |
_marking_stack.clear(); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
500 |
_objarray_stack.clear(true); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
501 |
_revisit_klass_stack.clear(true); |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
502 |
_revisit_mdo_stack.clear(true); |
1 | 503 |
} |
504 |
||
505 |
void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) { |
|
506 |
// Recursively traverse all live objects and mark them |
|
507 |
EventMark m("1 mark object"); |
|
508 |
TraceTime tm("phase 1", PrintGCDetails && Verbose, true, gclog_or_tty); |
|
509 |
trace(" 1"); |
|
510 |
||
511 |
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
|
512 |
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
|
513 |
||
514 |
// General strong roots. |
|
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
515 |
{ |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
516 |
ParallelScavengeHeap::ParStrongRootsScope psrs; |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
517 |
Universe::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
518 |
JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
519 |
CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /*do_marking=*/ true); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
520 |
Threads::oops_do(mark_and_push_closure(), &each_active_code_blob); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
521 |
ObjectSynchronizer::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
522 |
FlatProfiler::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
523 |
Management::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
524 |
JvmtiExport::oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
525 |
SystemDictionary::always_strong_oops_do(mark_and_push_closure()); |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
526 |
// 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
|
527 |
//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
|
528 |
} |
1 | 529 |
|
530 |
// Flush marking stack. |
|
531 |
follow_stack(); |
|
532 |
||
533 |
// Process reference objects found during marking |
|
534 |
{ |
|
1610
5dddd195cc86
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
1606
diff
changeset
|
535 |
ref_processor()->setup_policy(clear_all_softrefs); |
1 | 536 |
ref_processor()->process_discovered_references( |
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1412
diff
changeset
|
537 |
is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL); |
1 | 538 |
} |
539 |
||
540 |
// Follow system dictionary roots and unload classes |
|
541 |
bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); |
|
542 |
||
543 |
// Follow code cache roots |
|
544 |
CodeCache::do_unloading(is_alive_closure(), mark_and_push_closure(), |
|
545 |
purged_class); |
|
546 |
follow_stack(); // Flush marking stack |
|
547 |
||
548 |
// Update subklass/sibling/implementor links of live klasses |
|
549 |
follow_weak_klass_links(); |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
550 |
assert(_marking_stack.is_empty(), "just drained"); |
1 | 551 |
|
3696 | 552 |
// Visit memoized mdo's and clear unmarked weak refs |
553 |
follow_mdo_weak_refs(); |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
554 |
assert(_marking_stack.is_empty(), "just drained"); |
3696 | 555 |
|
8076
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7918
diff
changeset
|
556 |
// Visit interned string tables and delete unmarked oops |
1 | 557 |
StringTable::unlink(is_alive_closure()); |
8076
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7918
diff
changeset
|
558 |
// Clean up unreferenced symbols in symbol table. |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7918
diff
changeset
|
559 |
SymbolTable::unlink(); |
1 | 560 |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
5547
diff
changeset
|
561 |
assert(_marking_stack.is_empty(), "stack should be empty by now"); |
1 | 562 |
} |
563 |
||
564 |
||
565 |
void PSMarkSweep::mark_sweep_phase2() { |
|
566 |
EventMark m("2 compute new addresses"); |
|
567 |
TraceTime tm("phase 2", PrintGCDetails && Verbose, true, gclog_or_tty); |
|
568 |
trace("2"); |
|
569 |
||
570 |
// Now all live objects are marked, compute the new object addresses. |
|
571 |
||
572 |
// It is imperative that we traverse perm_gen LAST. If dead space is |
|
573 |
// allowed a range of dead object may get overwritten by a dead int |
|
574 |
// array. If perm_gen is not traversed last a klassOop may get |
|
575 |
// overwritten. This is fine since it is dead, but if the class has dead |
|
576 |
// instances we have to skip them, and in order to find their size we |
|
577 |
// need the klassOop! |
|
578 |
// |
|
579 |
// It is not required that we traverse spaces in the same order in |
|
580 |
// phase2, phase3 and phase4, but the ValidateMarkSweep live oops |
|
581 |
// tracking expects us to do so. See comment under phase4. |
|
582 |
||
583 |
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
|
584 |
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
|
585 |
||
586 |
PSOldGen* old_gen = heap->old_gen(); |
|
587 |
PSPermGen* perm_gen = heap->perm_gen(); |
|
588 |
||
589 |
// Begin compacting into the old gen |
|
590 |
PSMarkSweepDecorator::set_destination_decorator_tenured(); |
|
591 |
||
592 |
// This will also compact the young gen spaces. |
|
593 |
old_gen->precompact(); |
|
594 |
||
595 |
// Compact the perm gen into the perm gen |
|
596 |
PSMarkSweepDecorator::set_destination_decorator_perm_gen(); |
|
597 |
||
598 |
perm_gen->precompact(); |
|
599 |
} |
|
600 |
||
601 |
// This should be moved to the shared markSweep code! |
|
602 |
class PSAlwaysTrueClosure: public BoolObjectClosure { |
|
603 |
public: |
|
604 |
void do_object(oop p) { ShouldNotReachHere(); } |
|
605 |
bool do_object_b(oop p) { return true; } |
|
606 |
}; |
|
607 |
static PSAlwaysTrueClosure always_true; |
|
608 |
||
609 |
void PSMarkSweep::mark_sweep_phase3() { |
|
610 |
// Adjust the pointers to reflect the new locations |
|
611 |
EventMark m("3 adjust pointers"); |
|
612 |
TraceTime tm("phase 3", PrintGCDetails && Verbose, true, gclog_or_tty); |
|
613 |
trace("3"); |
|
614 |
||
615 |
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
|
616 |
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
|
617 |
||
618 |
PSYoungGen* young_gen = heap->young_gen(); |
|
619 |
PSOldGen* old_gen = heap->old_gen(); |
|
620 |
PSPermGen* perm_gen = heap->perm_gen(); |
|
621 |
||
622 |
// General strong roots. |
|
623 |
Universe::oops_do(adjust_root_pointer_closure()); |
|
624 |
JNIHandles::oops_do(adjust_root_pointer_closure()); // Global (strong) JNI handles |
|
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
625 |
Threads::oops_do(adjust_root_pointer_closure(), NULL); |
1 | 626 |
ObjectSynchronizer::oops_do(adjust_root_pointer_closure()); |
627 |
FlatProfiler::oops_do(adjust_root_pointer_closure()); |
|
628 |
Management::oops_do(adjust_root_pointer_closure()); |
|
629 |
JvmtiExport::oops_do(adjust_root_pointer_closure()); |
|
630 |
// SO_AllClasses |
|
631 |
SystemDictionary::oops_do(adjust_root_pointer_closure()); |
|
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2154
diff
changeset
|
632 |
//CodeCache::scavenge_root_nmethods_oops_do(adjust_root_pointer_closure()); |
1 | 633 |
|
634 |
// Now adjust pointers in remaining weak roots. (All of which should |
|
635 |
// have been cleared if they pointed to non-surviving objects.) |
|
636 |
// Global (weak) JNI handles |
|
637 |
JNIHandles::weak_oops_do(&always_true, adjust_root_pointer_closure()); |
|
638 |
||
639 |
CodeCache::oops_do(adjust_pointer_closure()); |
|
640 |
StringTable::oops_do(adjust_root_pointer_closure()); |
|
641 |
ref_processor()->weak_oops_do(adjust_root_pointer_closure()); |
|
642 |
PSScavenge::reference_processor()->weak_oops_do(adjust_root_pointer_closure()); |
|
643 |
||
644 |
adjust_marks(); |
|
645 |
||
646 |
young_gen->adjust_pointers(); |
|
647 |
old_gen->adjust_pointers(); |
|
648 |
perm_gen->adjust_pointers(); |
|
649 |
} |
|
650 |
||
651 |
void PSMarkSweep::mark_sweep_phase4() { |
|
652 |
EventMark m("4 compact heap"); |
|
653 |
TraceTime tm("phase 4", PrintGCDetails && Verbose, true, gclog_or_tty); |
|
654 |
trace("4"); |
|
655 |
||
656 |
// All pointers are now adjusted, move objects accordingly |
|
657 |
||
658 |
// It is imperative that we traverse perm_gen first in phase4. All |
|
659 |
// classes must be allocated earlier than their instances, and traversing |
|
660 |
// perm_gen first makes sure that all klassOops have moved to their new |
|
661 |
// location before any instance does a dispatch through it's klass! |
|
662 |
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
|
663 |
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
|
664 |
||
665 |
PSYoungGen* young_gen = heap->young_gen(); |
|
666 |
PSOldGen* old_gen = heap->old_gen(); |
|
667 |
PSPermGen* perm_gen = heap->perm_gen(); |
|
668 |
||
669 |
perm_gen->compact(); |
|
670 |
old_gen->compact(); |
|
671 |
young_gen->compact(); |
|
672 |
} |
|
673 |
||
674 |
jlong PSMarkSweep::millis_since_last_gc() { |
|
11251
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
10670
diff
changeset
|
675 |
// We need a monotonically non-deccreasing time in ms but |
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
10670
diff
changeset
|
676 |
// 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
|
677 |
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
|
678 |
jlong ret_val = now - _time_of_last_gc; |
1 | 679 |
// XXX See note in genCollectedHeap::millis_since_last_gc(). |
680 |
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
|
681 |
NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) |
1 | 682 |
return 0; |
683 |
} |
|
684 |
return ret_val; |
|
685 |
} |
|
686 |
||
687 |
void PSMarkSweep::reset_millis_since_last_gc() { |
|
11251
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
10670
diff
changeset
|
688 |
// We need a monotonically non-deccreasing time in ms but |
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
10670
diff
changeset
|
689 |
// 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
|
690 |
_time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
1 | 691 |
} |