truffle: src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp annotate

annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 10287:12f651e29f6b

6843347: Boundary values in some public GC options cause crashes Summary: Setting some public integer options to specific values causes crashes or undefined GC behavior. This patchset adds the necessary argument checking for these options. Reviewed-by: jmasa, brutisso

author	tschatzl
date	Wed, 15 May 2013 11:05:09 +0200
parents	2f50bc369470
children	eba99d16dc6f

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
4872 aa3d708d67c4 7141200: log some interesting information in ring buffers for crashes never parents: 4712 diff changeset	2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
0 a61af66fc99e Initial load duke parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load duke parents: diff changeset	4 *
a61af66fc99e Initial load duke parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load duke parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load duke parents: diff changeset	7 * published by the Free Software Foundation.
a61af66fc99e Initial load duke parents: diff changeset	8 *
a61af66fc99e Initial load duke parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load duke parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load duke parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load duke parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load duke parents: diff changeset	13 * accompanied this code).
a61af66fc99e Initial load duke parents: diff changeset	14 *
a61af66fc99e Initial load duke parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load duke parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load duke parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load duke parents: diff changeset	18 *
1552 c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1387 diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1387 diff changeset	20 * or visit www.oracle.com if you need additional information or have any
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1387 diff changeset	21 * questions.
0 a61af66fc99e Initial load duke parents: diff changeset	22 *
a61af66fc99e Initial load duke parents: diff changeset	23 */
a61af66fc99e Initial load duke parents: diff changeset	24
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	25 #include "precompiled.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	26 #include "classfile/symbolTable.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	27 #include "classfile/systemDictionary.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	28 #include "code/codeCache.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	29 #include "gc_implementation/parallelScavenge/generationSizer.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	30 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	31 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	32 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	33 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	34 #include "gc_implementation/parallelScavenge/psOldGen.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	35 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	36 #include "gc_implementation/parallelScavenge/psYoungGen.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	37 #include "gc_implementation/shared/isGCActiveMark.hpp"
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	38 #include "gc_implementation/shared/markSweep.hpp"
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	39 #include "gc_implementation/shared/spaceDecorator.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	40 #include "gc_interface/gcCause.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	41 #include "memory/gcLocker.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	42 #include "memory/referencePolicy.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	43 #include "memory/referenceProcessor.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	44 #include "oops/oop.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	45 #include "runtime/biasedLocking.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	46 #include "runtime/fprofiler.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	47 #include "runtime/safepoint.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	48 #include "runtime/vmThread.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	49 #include "services/management.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	50 #include "services/memoryService.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	51 #include "utilities/events.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	52 #include "utilities/stack.inline.hpp"
0 a61af66fc99e Initial load duke parents: diff changeset	53
a61af66fc99e Initial load duke parents: diff changeset	54 elapsedTimer PSMarkSweep::_accumulated_time;
a61af66fc99e Initial load duke parents: diff changeset	55 jlong PSMarkSweep::_time_of_last_gc = 0;
a61af66fc99e Initial load duke parents: diff changeset	56 CollectorCounters* PSMarkSweep::_counters = NULL;
a61af66fc99e Initial load duke parents: diff changeset	57
a61af66fc99e Initial load duke parents: diff changeset	58 void PSMarkSweep::initialize() {
a61af66fc99e Initial load duke parents: diff changeset	59 MemRegion mr = Universe::heap()->reserved_region();
2369 92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 2177 diff changeset	60 _ref_processor = new ReferenceProcessor(mr); // a vanilla ref proc
374 a4b729f5b611 6716466: par compact - remove VerifyParallelOldWithMarkSweep code jcoomes parents: 263 diff changeset	61 _counters = new CollectorCounters("PSMarkSweep", 1);
0 a61af66fc99e Initial load duke parents: diff changeset	62 }
a61af66fc99e Initial load duke parents: diff changeset	63
a61af66fc99e Initial load duke parents: diff changeset	64 // This method contains all heap specific policy for invoking mark sweep.
a61af66fc99e Initial load duke parents: diff changeset	65 // PSMarkSweep::invoke_no_policy() will only attempt to mark-sweep-compact
a61af66fc99e Initial load duke parents: diff changeset	66 // the heap. It will do nothing further. If we need to bail out for policy
a61af66fc99e Initial load duke parents: diff changeset	67 // reasons, scavenge before full gc, or any other specialized behavior, it
a61af66fc99e Initial load duke parents: diff changeset	68 // needs to be added here.
a61af66fc99e Initial load duke parents: diff changeset	69 //
a61af66fc99e Initial load duke parents: diff changeset	70 // Note that this method should only be called from the vm_thread while
a61af66fc99e Initial load duke parents: diff changeset	71 // at a safepoint!
1387 0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	72 //
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	73 // Note that the all_soft_refs_clear flag in the collector policy
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	74 // may be true because this method can be called without intervening
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	75 // activity. For example when the heap space is tight and full measure
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	76 // are being taken to free space.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	77
0 a61af66fc99e Initial load duke parents: diff changeset	78 void PSMarkSweep::invoke(bool maximum_heap_compaction) {
a61af66fc99e Initial load duke parents: diff changeset	79 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
a61af66fc99e Initial load duke parents: diff changeset	80 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread");
a61af66fc99e Initial load duke parents: diff changeset	81 assert(!Universe::heap()->is_gc_active(), "not reentrant");
a61af66fc99e Initial load duke parents: diff changeset	82
a61af66fc99e Initial load duke parents: diff changeset	83 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
a61af66fc99e Initial load duke parents: diff changeset	84 GCCause::Cause gc_cause = heap->gc_cause();
a61af66fc99e Initial load duke parents: diff changeset	85 PSAdaptiveSizePolicy* policy = heap->size_policy();
1387 0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	86 IsGCActiveMark mark;
0 a61af66fc99e Initial load duke parents: diff changeset	87
1387 0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	88 if (ScavengeBeforeFullGC) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	89 PSScavenge::invoke_no_policy();
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	90 }
0 a61af66fc99e Initial load duke parents: diff changeset	91
1387 0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	92 const bool clear_all_soft_refs =
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	93 heap->collector_policy()->should_clear_all_soft_refs();
0 a61af66fc99e Initial load duke parents: diff changeset	94
10287 12f651e29f6b 6843347: Boundary values in some public GC options cause crashes tschatzl parents: 10188 diff changeset	95 uint count = maximum_heap_compaction ? 1 : MarkSweepAlwaysCompactCount;
12f651e29f6b 6843347: Boundary values in some public GC options cause crashes tschatzl parents: 10188 diff changeset	96 UIntFlagSetting flag_setting(MarkSweepAlwaysCompactCount, count);
1387 0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	97 PSMarkSweep::invoke_no_policy(clear_all_soft_refs \|\| maximum_heap_compaction);
0 a61af66fc99e Initial load duke parents: diff changeset	98 }
a61af66fc99e Initial load duke parents: diff changeset	99
a61af66fc99e Initial load duke parents: diff changeset	100 // This method contains no policy. You should probably
a61af66fc99e Initial load duke parents: diff changeset	101 // be calling invoke() instead.
4913 ab4422d0ed59 7146343: PS invoke methods should indicate the type of gc done jcoomes parents: 4872 diff changeset	102 bool PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) {
0 a61af66fc99e Initial load duke parents: diff changeset	103 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
a61af66fc99e Initial load duke parents: diff changeset	104 assert(ref_processor() != NULL, "Sanity");
a61af66fc99e Initial load duke parents: diff changeset	105
a61af66fc99e Initial load duke parents: diff changeset	106 if (GC_locker::check_active_before_gc()) {
4913 ab4422d0ed59 7146343: PS invoke methods should indicate the type of gc done jcoomes parents: 4872 diff changeset	107 return false;
0 a61af66fc99e Initial load duke parents: diff changeset	108 }
a61af66fc99e Initial load duke parents: diff changeset	109
a61af66fc99e Initial load duke parents: diff changeset	110 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
a61af66fc99e Initial load duke parents: diff changeset	111 GCCause::Cause gc_cause = heap->gc_cause();
a61af66fc99e Initial load duke parents: diff changeset	112 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
a61af66fc99e Initial load duke parents: diff changeset	113 PSAdaptiveSizePolicy* size_policy = heap->size_policy();
a61af66fc99e Initial load duke parents: diff changeset	114
1387 0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	115 // The scope of casr should end after code that can change
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	116 // CollectorPolicy::_should_clear_all_soft_refs.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	117 ClearedAllSoftRefs casr(clear_all_softrefs, heap->collector_policy());
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	118
0 a61af66fc99e Initial load duke parents: diff changeset	119 PSYoungGen* young_gen = heap->young_gen();
a61af66fc99e Initial load duke parents: diff changeset	120 PSOldGen* old_gen = heap->old_gen();
a61af66fc99e Initial load duke parents: diff changeset	121
a61af66fc99e Initial load duke parents: diff changeset	122 // Increment the invocation count
a61af66fc99e Initial load duke parents: diff changeset	123 heap->increment_total_collections(true /* full */);
a61af66fc99e Initial load duke parents: diff changeset	124
263 12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection. jmasa parents: 0 diff changeset	125 // Save information needed to minimize mangling
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection. jmasa parents: 0 diff changeset	126 heap->record_gen_tops_before_GC();
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection. jmasa parents: 0 diff changeset	127
0 a61af66fc99e Initial load duke parents: diff changeset	128 // We need to track unique mark sweep invocations as well.
a61af66fc99e Initial load duke parents: diff changeset	129 _total_invocations++;
a61af66fc99e Initial load duke parents: diff changeset	130
a61af66fc99e Initial load duke parents: diff changeset	131 AdaptiveSizePolicyOutput(size_policy, heap->total_collections());
a61af66fc99e Initial load duke parents: diff changeset	132
4872 aa3d708d67c4 7141200: log some interesting information in ring buffers for crashes never parents: 4712 diff changeset	133 heap->print_heap_before_gc();
0 a61af66fc99e Initial load duke parents: diff changeset	134
a61af66fc99e Initial load duke parents: diff changeset	135 // Fill in TLABs
a61af66fc99e Initial load duke parents: diff changeset	136 heap->accumulate_statistics_all_tlabs();
a61af66fc99e Initial load duke parents: diff changeset	137 heap->ensure_parsability(true); // retire TLABs
a61af66fc99e Initial load duke parents: diff changeset	138
a61af66fc99e Initial load duke parents: diff changeset	139 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) {
a61af66fc99e Initial load duke parents: diff changeset	140 HandleMark hm; // Discard invalid handles created during verification
10186 b06ac540229e 8013132: Add a flag to turn off the output of the verbose verification code stefank parents: 10183 diff changeset	141 Universe::verify(" VerifyBeforeGC:");
0 a61af66fc99e Initial load duke parents: diff changeset	142 }
a61af66fc99e Initial load duke parents: diff changeset	143
a61af66fc99e Initial load duke parents: diff changeset	144 // Verify object start arrays
a61af66fc99e Initial load duke parents: diff changeset	145 if (VerifyObjectStartArray &&
a61af66fc99e Initial load duke parents: diff changeset	146 VerifyBeforeGC) {
a61af66fc99e Initial load duke parents: diff changeset	147 old_gen->verify_object_start_array();
a61af66fc99e Initial load duke parents: diff changeset	148 }
a61af66fc99e Initial load duke parents: diff changeset	149
615 c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 546 diff changeset	150 heap->pre_full_gc_dump();
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 546 diff changeset	151
0 a61af66fc99e Initial load duke parents: diff changeset	152 // Filled in below to track the state of the young gen after the collection.
a61af66fc99e Initial load duke parents: diff changeset	153 bool eden_empty;
a61af66fc99e Initial load duke parents: diff changeset	154 bool survivors_empty;
a61af66fc99e Initial load duke parents: diff changeset	155 bool young_gen_empty;
a61af66fc99e Initial load duke parents: diff changeset	156
a61af66fc99e Initial load duke parents: diff changeset	157 {
a61af66fc99e Initial load duke parents: diff changeset	158 HandleMark hm;
6064 9d679effd28c 7166894: Add gc cause to GC logging for all collectors brutisso parents: 4913 diff changeset	159
0 a61af66fc99e Initial load duke parents: diff changeset	160 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps);
a61af66fc99e Initial load duke parents: diff changeset	161 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty);
6064 9d679effd28c 7166894: Add gc cause to GC logging for all collectors brutisso parents: 4913 diff changeset	162 TraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty);
0 a61af66fc99e Initial load duke parents: diff changeset	163 TraceCollectorStats tcs(counters());
3356 78542e2b5e35 7036199: Adding a notification to the implementation of GarbageCollectorMXBeans fparain parents: 2369 diff changeset	164 TraceMemoryManagerStats tms(true /* Full GC */,gc_cause);
0 a61af66fc99e Initial load duke parents: diff changeset	165
a61af66fc99e Initial load duke parents: diff changeset	166 if (TraceGen1Time) accumulated_time()->start();
a61af66fc99e Initial load duke parents: diff changeset	167
a61af66fc99e Initial load duke parents: diff changeset	168 // Let the size policy know we're starting
a61af66fc99e Initial load duke parents: diff changeset	169 size_policy->major_collection_begin();
a61af66fc99e Initial load duke parents: diff changeset	170
a61af66fc99e Initial load duke parents: diff changeset	171 CodeCache::gc_prologue();
a61af66fc99e Initial load duke parents: diff changeset	172 Threads::gc_prologue();
a61af66fc99e Initial load duke parents: diff changeset	173 BiasedLocking::preserve_marks();
a61af66fc99e Initial load duke parents: diff changeset	174
a61af66fc99e Initial load duke parents: diff changeset	175 // Capture heap size before collection for printing.
a61af66fc99e Initial load duke parents: diff changeset	176 size_t prev_used = heap->used();
a61af66fc99e Initial load duke parents: diff changeset	177
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	178 // Capture metadata size before collection for sizing.
10183 868d87ed63c8 8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions jmasa parents: 10179 diff changeset	179 size_t metadata_prev_used = MetaspaceAux::allocated_used_bytes();
0 a61af66fc99e Initial load duke parents: diff changeset	180
a61af66fc99e Initial load duke parents: diff changeset	181 // For PrintGCDetails
a61af66fc99e Initial load duke parents: diff changeset	182 size_t old_gen_prev_used = old_gen->used_in_bytes();
a61af66fc99e Initial load duke parents: diff changeset	183 size_t young_gen_prev_used = young_gen->used_in_bytes();
a61af66fc99e Initial load duke parents: diff changeset	184
a61af66fc99e Initial load duke parents: diff changeset	185 allocate_stacks();
a61af66fc99e Initial load duke parents: diff changeset	186
a61af66fc99e Initial load duke parents: diff changeset	187 COMPILER2_PRESENT(DerivedPointerTable::clear());
a61af66fc99e Initial load duke parents: diff changeset	188
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3915 diff changeset	189 ref_processor()->enable_discovery(true /verify_disabled/, true /verify_no_refs/);
457 27a80744a83b 6778647: snap(), snap_policy() should be renamed setup(), setup_policy() ysr parents: 453 diff changeset	190 ref_processor()->setup_policy(clear_all_softrefs);
0 a61af66fc99e Initial load duke parents: diff changeset	191
a61af66fc99e Initial load duke parents: diff changeset	192 mark_sweep_phase1(clear_all_softrefs);
a61af66fc99e Initial load duke parents: diff changeset	193
a61af66fc99e Initial load duke parents: diff changeset	194 mark_sweep_phase2();
a61af66fc99e Initial load duke parents: diff changeset	195
a61af66fc99e Initial load duke parents: diff changeset	196 // Don't add any more derived pointers during phase3
a61af66fc99e Initial load duke parents: diff changeset	197 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity"));
a61af66fc99e Initial load duke parents: diff changeset	198 COMPILER2_PRESENT(DerivedPointerTable::set_active(false));
a61af66fc99e Initial load duke parents: diff changeset	199
a61af66fc99e Initial load duke parents: diff changeset	200 mark_sweep_phase3();
a61af66fc99e Initial load duke parents: diff changeset	201
a61af66fc99e Initial load duke parents: diff changeset	202 mark_sweep_phase4();
a61af66fc99e Initial load duke parents: diff changeset	203
a61af66fc99e Initial load duke parents: diff changeset	204 restore_marks();
a61af66fc99e Initial load duke parents: diff changeset	205
a61af66fc99e Initial load duke parents: diff changeset	206 deallocate_stacks();
a61af66fc99e Initial load duke parents: diff changeset	207
263 12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection. jmasa parents: 0 diff changeset	208 if (ZapUnusedHeapArea) {
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection. jmasa parents: 0 diff changeset	209 // Do a complete mangle (top to end) because the usage for
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection. jmasa parents: 0 diff changeset	210 // scratch does not maintain a top pointer.
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection. jmasa parents: 0 diff changeset	211 young_gen->to_space()->mangle_unused_area_complete();
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection. jmasa parents: 0 diff changeset	212 }
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection. jmasa parents: 0 diff changeset	213
0 a61af66fc99e Initial load duke parents: diff changeset	214 eden_empty = young_gen->eden_space()->is_empty();
a61af66fc99e Initial load duke parents: diff changeset	215 if (!eden_empty) {
a61af66fc99e Initial load duke parents: diff changeset	216 eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen);
a61af66fc99e Initial load duke parents: diff changeset	217 }
a61af66fc99e Initial load duke parents: diff changeset	218
a61af66fc99e Initial load duke parents: diff changeset	219 // Update heap occupancy information which is used as
a61af66fc99e Initial load duke parents: diff changeset	220 // input to soft ref clearing policy at the next gc.
a61af66fc99e Initial load duke parents: diff changeset	221 Universe::update_heap_info_at_gc();
a61af66fc99e Initial load duke parents: diff changeset	222
a61af66fc99e Initial load duke parents: diff changeset	223 survivors_empty = young_gen->from_space()->is_empty() &&
263 12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection. jmasa parents: 0 diff changeset	224 young_gen->to_space()->is_empty();
0 a61af66fc99e Initial load duke parents: diff changeset	225 young_gen_empty = eden_empty && survivors_empty;
a61af66fc99e Initial load duke parents: diff changeset	226
a61af66fc99e Initial load duke parents: diff changeset	227 BarrierSet* bs = heap->barrier_set();
a61af66fc99e Initial load duke parents: diff changeset	228 if (bs->is_a(BarrierSet::ModRef)) {
a61af66fc99e Initial load duke parents: diff changeset	229 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs;
a61af66fc99e Initial load duke parents: diff changeset	230 MemRegion old_mr = heap->old_gen()->reserved();
a61af66fc99e Initial load duke parents: diff changeset	231 if (young_gen_empty) {
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	232 modBS->clear(MemRegion(old_mr.start(), old_mr.end()));
0 a61af66fc99e Initial load duke parents: diff changeset	233 } else {
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	234 modBS->invalidate(MemRegion(old_mr.start(), old_mr.end()));
0 a61af66fc99e Initial load duke parents: diff changeset	235 }
a61af66fc99e Initial load duke parents: diff changeset	236 }
a61af66fc99e Initial load duke parents: diff changeset	237
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	238 // Delete metaspaces for unloaded class loaders and clean up loader_data graph
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	239 ClassLoaderDataGraph::purge();
10183 868d87ed63c8 8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions jmasa parents: 10179 diff changeset	240 MetaspaceAux::verify_metrics();
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	241
0 a61af66fc99e Initial load duke parents: diff changeset	242 BiasedLocking::restore_marks();
a61af66fc99e Initial load duke parents: diff changeset	243 Threads::gc_epilogue();
a61af66fc99e Initial load duke parents: diff changeset	244 CodeCache::gc_epilogue();
2147 9afee0b9fc1d 7012505: BreakpointWithFullGC.sh fails with Internal Error (src/share/vm/oops/methodOop.cpp:220) kamg parents: 1972 diff changeset	245 JvmtiExport::gc_epilogue();
0 a61af66fc99e Initial load duke parents: diff changeset	246
a61af66fc99e Initial load duke parents: diff changeset	247 COMPILER2_PRESENT(DerivedPointerTable::update_pointers());
a61af66fc99e Initial load duke parents: diff changeset	248
a61af66fc99e Initial load duke parents: diff changeset	249 ref_processor()->enqueue_discovered_references(NULL);
a61af66fc99e Initial load duke parents: diff changeset	250
a61af66fc99e Initial load duke parents: diff changeset	251 // Update time of last GC
a61af66fc99e Initial load duke parents: diff changeset	252 reset_millis_since_last_gc();
a61af66fc99e Initial load duke parents: diff changeset	253
a61af66fc99e Initial load duke parents: diff changeset	254 // Let the size policy know we're done
a61af66fc99e Initial load duke parents: diff changeset	255 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause);
a61af66fc99e Initial load duke parents: diff changeset	256
a61af66fc99e Initial load duke parents: diff changeset	257 if (UseAdaptiveSizePolicy) {
a61af66fc99e Initial load duke parents: diff changeset	258
a61af66fc99e Initial load duke parents: diff changeset	259 if (PrintAdaptiveSizePolicy) {
a61af66fc99e Initial load duke parents: diff changeset	260 gclog_or_tty->print("AdaptiveSizeStart: ");
a61af66fc99e Initial load duke parents: diff changeset	261 gclog_or_tty->stamp();
a61af66fc99e Initial load duke parents: diff changeset	262 gclog_or_tty->print_cr(" collection: %d ",
a61af66fc99e Initial load duke parents: diff changeset	263 heap->total_collections());
a61af66fc99e Initial load duke parents: diff changeset	264 if (Verbose) {
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	265 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d",
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	266 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes());
0 a61af66fc99e Initial load duke parents: diff changeset	267 }
a61af66fc99e Initial load duke parents: diff changeset	268 }
a61af66fc99e Initial load duke parents: diff changeset	269
a61af66fc99e Initial load duke parents: diff changeset	270 // Don't check if the size_policy is ready here. Let
a61af66fc99e Initial load duke parents: diff changeset	271 // the size_policy check that internally.
a61af66fc99e Initial load duke parents: diff changeset	272 if (UseAdaptiveGenerationSizePolicyAtMajorCollection &&
a61af66fc99e Initial load duke parents: diff changeset	273 ((gc_cause != GCCause::_java_lang_system_gc) \|\|
a61af66fc99e Initial load duke parents: diff changeset	274 UseAdaptiveSizePolicyWithSystemGC)) {
a61af66fc99e Initial load duke parents: diff changeset	275 // Calculate optimal free space amounts
a61af66fc99e Initial load duke parents: diff changeset	276 assert(young_gen->max_size() >
a61af66fc99e Initial load duke parents: diff changeset	277 young_gen->from_space()->capacity_in_bytes() +
a61af66fc99e Initial load duke parents: diff changeset	278 young_gen->to_space()->capacity_in_bytes(),
a61af66fc99e Initial load duke parents: diff changeset	279 "Sizes of space in young gen are out-of-bounds");
a61af66fc99e Initial load duke parents: diff changeset	280 size_t max_eden_size = young_gen->max_size() -
a61af66fc99e Initial load duke parents: diff changeset	281 young_gen->from_space()->capacity_in_bytes() -
a61af66fc99e Initial load duke parents: diff changeset	282 young_gen->to_space()->capacity_in_bytes();
a61af66fc99e Initial load duke parents: diff changeset	283 size_policy->compute_generation_free_space(young_gen->used_in_bytes(),
a61af66fc99e Initial load duke parents: diff changeset	284 young_gen->eden_space()->used_in_bytes(),
a61af66fc99e Initial load duke parents: diff changeset	285 old_gen->used_in_bytes(),
a61af66fc99e Initial load duke parents: diff changeset	286 young_gen->eden_space()->capacity_in_bytes(),
a61af66fc99e Initial load duke parents: diff changeset	287 old_gen->max_gen_size(),
a61af66fc99e Initial load duke parents: diff changeset	288 max_eden_size,
a61af66fc99e Initial load duke parents: diff changeset	289 true /* full gc*/,
1387 0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	290 gc_cause,
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	291 heap->collector_policy());
0 a61af66fc99e Initial load duke parents: diff changeset	292
a61af66fc99e Initial load duke parents: diff changeset	293 heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes());
a61af66fc99e Initial load duke parents: diff changeset	294
a61af66fc99e Initial load duke parents: diff changeset	295 // Don't resize the young generation at an major collection. A
a61af66fc99e Initial load duke parents: diff changeset	296 // desired young generation size may have been calculated but
a61af66fc99e Initial load duke parents: diff changeset	297 // resizing the young generation complicates the code because the
a61af66fc99e Initial load duke parents: diff changeset	298 // resizing of the old generation may have moved the boundary
a61af66fc99e Initial load duke parents: diff changeset	299 // between the young generation and the old generation. Let the
a61af66fc99e Initial load duke parents: diff changeset	300 // young generation resizing happen at the minor collections.
a61af66fc99e Initial load duke parents: diff changeset	301 }
a61af66fc99e Initial load duke parents: diff changeset	302 if (PrintAdaptiveSizePolicy) {
a61af66fc99e Initial load duke parents: diff changeset	303 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ",
a61af66fc99e Initial load duke parents: diff changeset	304 heap->total_collections());
a61af66fc99e Initial load duke parents: diff changeset	305 }
a61af66fc99e Initial load duke parents: diff changeset	306 }
a61af66fc99e Initial load duke parents: diff changeset	307
a61af66fc99e Initial load duke parents: diff changeset	308 if (UsePerfData) {
a61af66fc99e Initial load duke parents: diff changeset	309 heap->gc_policy_counters()->update_counters();
a61af66fc99e Initial load duke parents: diff changeset	310 heap->gc_policy_counters()->update_old_capacity(
a61af66fc99e Initial load duke parents: diff changeset	311 old_gen->capacity_in_bytes());
a61af66fc99e Initial load duke parents: diff changeset	312 heap->gc_policy_counters()->update_young_capacity(
a61af66fc99e Initial load duke parents: diff changeset	313 young_gen->capacity_in_bytes());
a61af66fc99e Initial load duke parents: diff changeset	314 }
a61af66fc99e Initial load duke parents: diff changeset	315
a61af66fc99e Initial load duke parents: diff changeset	316 heap->resize_all_tlabs();
a61af66fc99e Initial load duke parents: diff changeset	317
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	318 // We collected the heap, recalculate the metaspace capacity
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	319 MetaspaceGC::compute_new_size();
0 a61af66fc99e Initial load duke parents: diff changeset	320
a61af66fc99e Initial load duke parents: diff changeset	321 if (TraceGen1Time) accumulated_time()->stop();
a61af66fc99e Initial load duke parents: diff changeset	322
a61af66fc99e Initial load duke parents: diff changeset	323 if (PrintGC) {
a61af66fc99e Initial load duke parents: diff changeset	324 if (PrintGCDetails) {
a61af66fc99e Initial load duke parents: diff changeset	325 // Don't print a GC timestamp here. This is after the GC so
a61af66fc99e Initial load duke parents: diff changeset	326 // would be confusing.
a61af66fc99e Initial load duke parents: diff changeset	327 young_gen->print_used_change(young_gen_prev_used);
a61af66fc99e Initial load duke parents: diff changeset	328 old_gen->print_used_change(old_gen_prev_used);
a61af66fc99e Initial load duke parents: diff changeset	329 }
a61af66fc99e Initial load duke parents: diff changeset	330 heap->print_heap_change(prev_used);
a61af66fc99e Initial load duke parents: diff changeset	331 if (PrintGCDetails) {
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	332 MetaspaceAux::print_metaspace_change(metadata_prev_used);
0 a61af66fc99e Initial load duke parents: diff changeset	333 }
a61af66fc99e Initial load duke parents: diff changeset	334 }
a61af66fc99e Initial load duke parents: diff changeset	335
a61af66fc99e Initial load duke parents: diff changeset	336 // Track memory usage and detect low memory
a61af66fc99e Initial load duke parents: diff changeset	337 MemoryService::track_memory_usage();
a61af66fc99e Initial load duke parents: diff changeset	338 heap->update_counters();
a61af66fc99e Initial load duke parents: diff changeset	339 }
a61af66fc99e Initial load duke parents: diff changeset	340
a61af66fc99e Initial load duke parents: diff changeset	341 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) {
a61af66fc99e Initial load duke parents: diff changeset	342 HandleMark hm; // Discard invalid handles created during verification
10186 b06ac540229e 8013132: Add a flag to turn off the output of the verbose verification code stefank parents: 10183 diff changeset	343 Universe::verify(" VerifyAfterGC:");
0 a61af66fc99e Initial load duke parents: diff changeset	344 }
a61af66fc99e Initial load duke parents: diff changeset	345
a61af66fc99e Initial load duke parents: diff changeset	346 // Re-verify object start arrays
a61af66fc99e Initial load duke parents: diff changeset	347 if (VerifyObjectStartArray &&
a61af66fc99e Initial load duke parents: diff changeset	348 VerifyAfterGC) {
a61af66fc99e Initial load duke parents: diff changeset	349 old_gen->verify_object_start_array();
a61af66fc99e Initial load duke parents: diff changeset	350 }
a61af66fc99e Initial load duke parents: diff changeset	351
263 12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection. jmasa parents: 0 diff changeset	352 if (ZapUnusedHeapArea) {
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection. jmasa parents: 0 diff changeset	353 old_gen->object_space()->check_mangled_unused_area_complete();
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection. jmasa parents: 0 diff changeset	354 }
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection. jmasa parents: 0 diff changeset	355
0 a61af66fc99e Initial load duke parents: diff changeset	356 NOT_PRODUCT(ref_processor()->verify_no_references_recorded());
a61af66fc99e Initial load duke parents: diff changeset	357
4872 aa3d708d67c4 7141200: log some interesting information in ring buffers for crashes never parents: 4712 diff changeset	358 heap->print_heap_after_gc();
546 05c6d52fa7a9 6690928: Use spinning in combination with yields for workstealing termination. jmasa parents: 481 diff changeset	359
615 c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 546 diff changeset	360 heap->post_full_gc_dump();
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 546 diff changeset	361
546 05c6d52fa7a9 6690928: Use spinning in combination with yields for workstealing termination. jmasa parents: 481 diff changeset	362 #ifdef TRACESPINNING
05c6d52fa7a9 6690928: Use spinning in combination with yields for workstealing termination. jmasa parents: 481 diff changeset	363 ParallelTaskTerminator::print_termination_counts();
05c6d52fa7a9 6690928: Use spinning in combination with yields for workstealing termination. jmasa parents: 481 diff changeset	364 #endif
4913 ab4422d0ed59 7146343: PS invoke methods should indicate the type of gc done jcoomes parents: 4872 diff changeset	365
ab4422d0ed59 7146343: PS invoke methods should indicate the type of gc done jcoomes parents: 4872 diff changeset	366 return true;
0 a61af66fc99e Initial load duke parents: diff changeset	367 }
a61af66fc99e Initial load duke parents: diff changeset	368
a61af66fc99e Initial load duke parents: diff changeset	369 bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy,
a61af66fc99e Initial load duke parents: diff changeset	370 PSYoungGen* young_gen,
a61af66fc99e Initial load duke parents: diff changeset	371 PSOldGen* old_gen) {
a61af66fc99e Initial load duke parents: diff changeset	372 MutableSpace* const eden_space = young_gen->eden_space();
a61af66fc99e Initial load duke parents: diff changeset	373 assert(!eden_space->is_empty(), "eden must be non-empty");
a61af66fc99e Initial load duke parents: diff changeset	374 assert(young_gen->virtual_space()->alignment() ==
a61af66fc99e Initial load duke parents: diff changeset	375 old_gen->virtual_space()->alignment(), "alignments do not match");
a61af66fc99e Initial load duke parents: diff changeset	376
a61af66fc99e Initial load duke parents: diff changeset	377 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) {
a61af66fc99e Initial load duke parents: diff changeset	378 return false;
a61af66fc99e Initial load duke parents: diff changeset	379 }
a61af66fc99e Initial load duke parents: diff changeset	380
a61af66fc99e Initial load duke parents: diff changeset	381 // Both generations must be completely committed.
a61af66fc99e Initial load duke parents: diff changeset	382 if (young_gen->virtual_space()->uncommitted_size() != 0) {
a61af66fc99e Initial load duke parents: diff changeset	383 return false;
a61af66fc99e Initial load duke parents: diff changeset	384 }
a61af66fc99e Initial load duke parents: diff changeset	385 if (old_gen->virtual_space()->uncommitted_size() != 0) {
a61af66fc99e Initial load duke parents: diff changeset	386 return false;
a61af66fc99e Initial load duke parents: diff changeset	387 }
a61af66fc99e Initial load duke parents: diff changeset	388
a61af66fc99e Initial load duke parents: diff changeset	389 // Figure out how much to take from eden. Include the average amount promoted
a61af66fc99e Initial load duke parents: diff changeset	390 // in the total; otherwise the next young gen GC will simply bail out to a
a61af66fc99e Initial load duke parents: diff changeset	391 // full GC.
a61af66fc99e Initial load duke parents: diff changeset	392 const size_t alignment = old_gen->virtual_space()->alignment();
a61af66fc99e Initial load duke parents: diff changeset	393 const size_t eden_used = eden_space->used_in_bytes();
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 457 diff changeset	394 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average();
0 a61af66fc99e Initial load duke parents: diff changeset	395 const size_t absorb_size = align_size_up(eden_used + promoted, alignment);
a61af66fc99e Initial load duke parents: diff changeset	396 const size_t eden_capacity = eden_space->capacity_in_bytes();
a61af66fc99e Initial load duke parents: diff changeset	397
a61af66fc99e Initial load duke parents: diff changeset	398 if (absorb_size >= eden_capacity) {
a61af66fc99e Initial load duke parents: diff changeset	399 return false; // Must leave some space in eden.
a61af66fc99e Initial load duke parents: diff changeset	400 }
a61af66fc99e Initial load duke parents: diff changeset	401
a61af66fc99e Initial load duke parents: diff changeset	402 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size;
a61af66fc99e Initial load duke parents: diff changeset	403 if (new_young_size < young_gen->min_gen_size()) {
a61af66fc99e Initial load duke parents: diff changeset	404 return false; // Respect young gen minimum size.
a61af66fc99e Initial load duke parents: diff changeset	405 }
a61af66fc99e Initial load duke parents: diff changeset	406
a61af66fc99e Initial load duke parents: diff changeset	407 if (TraceAdaptiveGCBoundary && Verbose) {
a61af66fc99e Initial load duke parents: diff changeset	408 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: "
a61af66fc99e Initial load duke parents: diff changeset	409 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K "
a61af66fc99e Initial load duke parents: diff changeset	410 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K "
a61af66fc99e Initial load duke parents: diff changeset	411 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ",
a61af66fc99e Initial load duke parents: diff changeset	412 absorb_size / K,
a61af66fc99e Initial load duke parents: diff changeset	413 eden_capacity / K, (eden_capacity - absorb_size) / K,
a61af66fc99e Initial load duke parents: diff changeset	414 young_gen->from_space()->used_in_bytes() / K,
a61af66fc99e Initial load duke parents: diff changeset	415 young_gen->to_space()->used_in_bytes() / K,
a61af66fc99e Initial load duke parents: diff changeset	416 young_gen->capacity_in_bytes() / K, new_young_size / K);
a61af66fc99e Initial load duke parents: diff changeset	417 }
a61af66fc99e Initial load duke parents: diff changeset	418
a61af66fc99e Initial load duke parents: diff changeset	419 // Fill the unused part of the old gen.
a61af66fc99e Initial load duke parents: diff changeset	420 MutableSpace* const old_space = old_gen->object_space();
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 457 diff changeset	421 HeapWord* const unused_start = old_space->top();
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 457 diff changeset	422 size_t const unused_words = pointer_delta(old_space->end(), unused_start);
0 a61af66fc99e Initial load duke parents: diff changeset	423
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 457 diff changeset	424 if (unused_words > 0) {
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 457 diff changeset	425 if (unused_words < CollectedHeap::min_fill_size()) {
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 457 diff changeset	426 return false; // If the old gen cannot be filled, must give up.
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 457 diff changeset	427 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 457 diff changeset	428 CollectedHeap::fill_with_objects(unused_start, unused_words);
0 a61af66fc99e Initial load duke parents: diff changeset	429 }
a61af66fc99e Initial load duke parents: diff changeset	430
a61af66fc99e Initial load duke parents: diff changeset	431 // Take the live data from eden and set both top and end in the old gen to
a61af66fc99e Initial load duke parents: diff changeset	432 // eden top. (Need to set end because reset_after_change() mangles the region
a61af66fc99e Initial load duke parents: diff changeset	433 // from end to virtual_space->high() in debug builds).
a61af66fc99e Initial load duke parents: diff changeset	434 HeapWord* const new_top = eden_space->top();
a61af66fc99e Initial load duke parents: diff changeset	435 old_gen->virtual_space()->expand_into(young_gen->virtual_space(),
a61af66fc99e Initial load duke parents: diff changeset	436 absorb_size);
a61af66fc99e Initial load duke parents: diff changeset	437 young_gen->reset_after_change();
a61af66fc99e Initial load duke parents: diff changeset	438 old_space->set_top(new_top);
a61af66fc99e Initial load duke parents: diff changeset	439 old_space->set_end(new_top);
a61af66fc99e Initial load duke parents: diff changeset	440 old_gen->reset_after_change();
a61af66fc99e Initial load duke parents: diff changeset	441
a61af66fc99e Initial load duke parents: diff changeset	442 // Update the object start array for the filler object and the data from eden.
a61af66fc99e Initial load duke parents: diff changeset	443 ObjectStartArray* const start_array = old_gen->start_array();
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 457 diff changeset	444 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) {
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 457 diff changeset	445 start_array->allocate_block(p);
0 a61af66fc99e Initial load duke parents: diff changeset	446 }
a61af66fc99e Initial load duke parents: diff changeset	447
a61af66fc99e Initial load duke parents: diff changeset	448 // Could update the promoted average here, but it is not typically updated at
a61af66fc99e Initial load duke parents: diff changeset	449 // full GCs and the value to use is unclear. Something like
a61af66fc99e Initial load duke parents: diff changeset	450 //
a61af66fc99e Initial load duke parents: diff changeset	451 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc.
a61af66fc99e Initial load duke parents: diff changeset	452
a61af66fc99e Initial load duke parents: diff changeset	453 size_policy->set_bytes_absorbed_from_eden(absorb_size);
a61af66fc99e Initial load duke parents: diff changeset	454 return true;
a61af66fc99e Initial load duke parents: diff changeset	455 }
a61af66fc99e Initial load duke parents: diff changeset	456
a61af66fc99e Initial load duke parents: diff changeset	457 void PSMarkSweep::allocate_stacks() {
a61af66fc99e Initial load duke parents: diff changeset	458 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
a61af66fc99e Initial load duke parents: diff changeset	459 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
a61af66fc99e Initial load duke parents: diff changeset	460
a61af66fc99e Initial load duke parents: diff changeset	461 PSYoungGen* young_gen = heap->young_gen();
a61af66fc99e Initial load duke parents: diff changeset	462
a61af66fc99e Initial load duke parents: diff changeset	463 MutableSpace* to_space = young_gen->to_space();
a61af66fc99e Initial load duke parents: diff changeset	464 _preserved_marks = (PreservedMark*)to_space->top();
a61af66fc99e Initial load duke parents: diff changeset	465 _preserved_count = 0;
a61af66fc99e Initial load duke parents: diff changeset	466
a61af66fc99e Initial load duke parents: diff changeset	467 // We want to calculate the size in bytes first.
a61af66fc99e Initial load duke parents: diff changeset	468 _preserved_count_max = pointer_delta(to_space->end(), to_space->top(), sizeof(jbyte));
a61af66fc99e Initial load duke parents: diff changeset	469 // Now divide by the size of a PreservedMark
a61af66fc99e Initial load duke parents: diff changeset	470 _preserved_count_max /= sizeof(PreservedMark);
a61af66fc99e Initial load duke parents: diff changeset	471 }
a61af66fc99e Initial load duke parents: diff changeset	472
a61af66fc99e Initial load duke parents: diff changeset	473
a61af66fc99e Initial load duke parents: diff changeset	474 void PSMarkSweep::deallocate_stacks() {
1836 894b1d7c7e01 6423256: GC stacks should use a better data structure jcoomes parents: 1552 diff changeset	475 _preserved_mark_stack.clear(true);
894b1d7c7e01 6423256: GC stacks should use a better data structure jcoomes parents: 1552 diff changeset	476 _preserved_oop_stack.clear(true);
894b1d7c7e01 6423256: GC stacks should use a better data structure jcoomes parents: 1552 diff changeset	477 _marking_stack.clear();
894b1d7c7e01 6423256: GC stacks should use a better data structure jcoomes parents: 1552 diff changeset	478 _objarray_stack.clear(true);
0 a61af66fc99e Initial load duke parents: diff changeset	479 }
a61af66fc99e Initial load duke parents: diff changeset	480
a61af66fc99e Initial load duke parents: diff changeset	481 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) {
a61af66fc99e Initial load duke parents: diff changeset	482 // Recursively traverse all live objects and mark them
a61af66fc99e Initial load duke parents: diff changeset	483 TraceTime tm("phase 1", PrintGCDetails && Verbose, true, gclog_or_tty);
a61af66fc99e Initial load duke parents: diff changeset	484 trace(" 1");
a61af66fc99e Initial load duke parents: diff changeset	485
a61af66fc99e Initial load duke parents: diff changeset	486 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
a61af66fc99e Initial load duke parents: diff changeset	487 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
a61af66fc99e Initial load duke parents: diff changeset	488
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	489 // Need to clear claim bits before the tracing starts.
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	490 ClassLoaderDataGraph::clear_claimed_marks();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	491
0 a61af66fc99e Initial load duke parents: diff changeset	492 // General strong roots.
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 628 diff changeset	493 {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 628 diff changeset	494 ParallelScavengeHeap::ParStrongRootsScope psrs;
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 628 diff changeset	495 Universe::oops_do(mark_and_push_closure());
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 628 diff changeset	496 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles
7179 d0aa87f04bd5 8003720: NPG: Method in interpreter stack frame can be deallocated stefank parents: 6865 diff changeset	497 CLDToOopClosure mark_and_push_from_cld(mark_and_push_closure());
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 628 diff changeset	498 CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /do_marking=/ true);
7179 d0aa87f04bd5 8003720: NPG: Method in interpreter stack frame can be deallocated stefank parents: 6865 diff changeset	499 Threads::oops_do(mark_and_push_closure(), &mark_and_push_from_cld, &each_active_code_blob);
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 628 diff changeset	500 ObjectSynchronizer::oops_do(mark_and_push_closure());
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 628 diff changeset	501 FlatProfiler::oops_do(mark_and_push_closure());
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 628 diff changeset	502 Management::oops_do(mark_and_push_closure());
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 628 diff changeset	503 JvmtiExport::oops_do(mark_and_push_closure());
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 628 diff changeset	504 SystemDictionary::always_strong_oops_do(mark_and_push_closure());
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	505 ClassLoaderDataGraph::always_strong_oops_do(mark_and_push_closure(), follow_klass_closure(), true);
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 628 diff changeset	506 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 628 diff changeset	507 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure()));
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 628 diff changeset	508 }
0 a61af66fc99e Initial load duke parents: diff changeset	509
a61af66fc99e Initial load duke parents: diff changeset	510 // Flush marking stack.
a61af66fc99e Initial load duke parents: diff changeset	511 follow_stack();
a61af66fc99e Initial load duke parents: diff changeset	512
a61af66fc99e Initial load duke parents: diff changeset	513 // Process reference objects found during marking
a61af66fc99e Initial load duke parents: diff changeset	514 {
457 27a80744a83b 6778647: snap(), snap_policy() should be renamed setup(), setup_policy() ysr parents: 453 diff changeset	515 ref_processor()->setup_policy(clear_all_softrefs);
0 a61af66fc99e Initial load duke parents: diff changeset	516 ref_processor()->process_discovered_references(
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 380 diff changeset	517 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL);
0 a61af66fc99e Initial load duke parents: diff changeset	518 }
a61af66fc99e Initial load duke parents: diff changeset	519
10188 2f50bc369470 8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading stefank parents: 10186 diff changeset	520 // This is the point where the entire marking should have completed.
2f50bc369470 8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading stefank parents: 10186 diff changeset	521 assert(_marking_stack.is_empty(), "Marking should have completed");
2f50bc369470 8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading stefank parents: 10186 diff changeset	522
2f50bc369470 8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading stefank parents: 10186 diff changeset	523 // Unload classes and purge the SystemDictionary.
0 a61af66fc99e Initial load duke parents: diff changeset	524 bool purged_class = SystemDictionary::do_unloading(is_alive_closure());
a61af66fc99e Initial load duke parents: diff changeset	525
10188 2f50bc369470 8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading stefank parents: 10186 diff changeset	526 // Unload nmethods.
6787 8966c2d65d96 7200470: KeepAliveClosure not needed in CodeCache::do_unloading brutisso parents: 6725 diff changeset	527 CodeCache::do_unloading(is_alive_closure(), purged_class);
0 a61af66fc99e Initial load duke parents: diff changeset	528
10188 2f50bc369470 8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading stefank parents: 10186 diff changeset	529 // Prune dead klasses from subklass/sibling/implementor lists.
2f50bc369470 8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading stefank parents: 10186 diff changeset	530 Klass::clean_weak_klass_links(is_alive_closure());
941 8b46c4d82093 4957990: Perm heap bloat in JVM ysr parents: 628 diff changeset	531
10188 2f50bc369470 8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading stefank parents: 10186 diff changeset	532 // Delete entries for dead interned strings.
0 a61af66fc99e Initial load duke parents: diff changeset	533 StringTable::unlink(is_alive_closure());
10188 2f50bc369470 8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading stefank parents: 10186 diff changeset	534
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 2147 diff changeset	535 // Clean up unreferenced symbols in symbol table.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 2147 diff changeset	536 SymbolTable::unlink();
0 a61af66fc99e Initial load duke parents: diff changeset	537 }
a61af66fc99e Initial load duke parents: diff changeset	538
a61af66fc99e Initial load duke parents: diff changeset	539
a61af66fc99e Initial load duke parents: diff changeset	540 void PSMarkSweep::mark_sweep_phase2() {
a61af66fc99e Initial load duke parents: diff changeset	541 TraceTime tm("phase 2", PrintGCDetails && Verbose, true, gclog_or_tty);
a61af66fc99e Initial load duke parents: diff changeset	542 trace("2");
a61af66fc99e Initial load duke parents: diff changeset	543
a61af66fc99e Initial load duke parents: diff changeset	544 // Now all live objects are marked, compute the new object addresses.
a61af66fc99e Initial load duke parents: diff changeset	545
a61af66fc99e Initial load duke parents: diff changeset	546 // It is not required that we traverse spaces in the same order in
a61af66fc99e Initial load duke parents: diff changeset	547 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops
a61af66fc99e Initial load duke parents: diff changeset	548 // tracking expects us to do so. See comment under phase4.
a61af66fc99e Initial load duke parents: diff changeset	549
a61af66fc99e Initial load duke parents: diff changeset	550 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
a61af66fc99e Initial load duke parents: diff changeset	551 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
a61af66fc99e Initial load duke parents: diff changeset	552
a61af66fc99e Initial load duke parents: diff changeset	553 PSOldGen* old_gen = heap->old_gen();
a61af66fc99e Initial load duke parents: diff changeset	554
a61af66fc99e Initial load duke parents: diff changeset	555 // Begin compacting into the old gen
a61af66fc99e Initial load duke parents: diff changeset	556 PSMarkSweepDecorator::set_destination_decorator_tenured();
a61af66fc99e Initial load duke parents: diff changeset	557
a61af66fc99e Initial load duke parents: diff changeset	558 // This will also compact the young gen spaces.
a61af66fc99e Initial load duke parents: diff changeset	559 old_gen->precompact();
a61af66fc99e Initial load duke parents: diff changeset	560 }
a61af66fc99e Initial load duke parents: diff changeset	561
a61af66fc99e Initial load duke parents: diff changeset	562 // This should be moved to the shared markSweep code!
a61af66fc99e Initial load duke parents: diff changeset	563 class PSAlwaysTrueClosure: public BoolObjectClosure {
a61af66fc99e Initial load duke parents: diff changeset	564 public:
a61af66fc99e Initial load duke parents: diff changeset	565 void do_object(oop p) { ShouldNotReachHere(); }
a61af66fc99e Initial load duke parents: diff changeset	566 bool do_object_b(oop p) { return true; }
a61af66fc99e Initial load duke parents: diff changeset	567 };
a61af66fc99e Initial load duke parents: diff changeset	568 static PSAlwaysTrueClosure always_true;
a61af66fc99e Initial load duke parents: diff changeset	569
a61af66fc99e Initial load duke parents: diff changeset	570 void PSMarkSweep::mark_sweep_phase3() {
a61af66fc99e Initial load duke parents: diff changeset	571 // Adjust the pointers to reflect the new locations
a61af66fc99e Initial load duke parents: diff changeset	572 TraceTime tm("phase 3", PrintGCDetails && Verbose, true, gclog_or_tty);
a61af66fc99e Initial load duke parents: diff changeset	573 trace("3");
a61af66fc99e Initial load duke parents: diff changeset	574
a61af66fc99e Initial load duke parents: diff changeset	575 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
a61af66fc99e Initial load duke parents: diff changeset	576 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
a61af66fc99e Initial load duke parents: diff changeset	577
a61af66fc99e Initial load duke parents: diff changeset	578 PSYoungGen* young_gen = heap->young_gen();
a61af66fc99e Initial load duke parents: diff changeset	579 PSOldGen* old_gen = heap->old_gen();
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	580
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	581 // Need to clear claim bits before the tracing starts.
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6064 diff changeset	582 ClassLoaderDataGraph::clear_claimed_marks();
0 a61af66fc99e Initial load duke parents: diff changeset	583
a61af66fc99e Initial load duke parents: diff changeset	584 // General strong roots.
10179 a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7179 diff changeset	585 Universe::oops_do(adjust_pointer_closure());
a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7179 diff changeset	586 JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles
a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7179 diff changeset	587 CLDToOopClosure adjust_from_cld(adjust_pointer_closure());
a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7179 diff changeset	588 Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL);
a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7179 diff changeset	589 ObjectSynchronizer::oops_do(adjust_pointer_closure());
a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7179 diff changeset	590 FlatProfiler::oops_do(adjust_pointer_closure());
a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7179 diff changeset	591 Management::oops_do(adjust_pointer_closure());
a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7179 diff changeset	592 JvmtiExport::oops_do(adjust_pointer_closure());
0 a61af66fc99e Initial load duke parents: diff changeset	593 // SO_AllClasses
10179 a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7179 diff changeset	594 SystemDictionary::oops_do(adjust_pointer_closure());
a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7179 diff changeset	595 ClassLoaderDataGraph::oops_do(adjust_pointer_closure(), adjust_klass_closure(), true);
0 a61af66fc99e Initial load duke parents: diff changeset	596
a61af66fc99e Initial load duke parents: diff changeset	597 // Now adjust pointers in remaining weak roots. (All of which should
a61af66fc99e Initial load duke parents: diff changeset	598 // have been cleared if they pointed to non-surviving objects.)
a61af66fc99e Initial load duke parents: diff changeset	599 // Global (weak) JNI handles
10179 a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7179 diff changeset	600 JNIHandles::weak_oops_do(&always_true, adjust_pointer_closure());
0 a61af66fc99e Initial load duke parents: diff changeset	601
a61af66fc99e Initial load duke parents: diff changeset	602 CodeCache::oops_do(adjust_pointer_closure());
10179 a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7179 diff changeset	603 StringTable::oops_do(adjust_pointer_closure());
a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7179 diff changeset	604 ref_processor()->weak_oops_do(adjust_pointer_closure());
a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7179 diff changeset	605 PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure());
0 a61af66fc99e Initial load duke parents: diff changeset	606
a61af66fc99e Initial load duke parents: diff changeset	607 adjust_marks();
a61af66fc99e Initial load duke parents: diff changeset	608
a61af66fc99e Initial load duke parents: diff changeset	609 young_gen->adjust_pointers();
a61af66fc99e Initial load duke parents: diff changeset	610 old_gen->adjust_pointers();
a61af66fc99e Initial load duke parents: diff changeset	611 }
a61af66fc99e Initial load duke parents: diff changeset	612
a61af66fc99e Initial load duke parents: diff changeset	613 void PSMarkSweep::mark_sweep_phase4() {
a61af66fc99e Initial load duke parents: diff changeset	614 EventMark m("4 compact heap");
a61af66fc99e Initial load duke parents: diff changeset	615 TraceTime tm("phase 4", PrintGCDetails && Verbose, true, gclog_or_tty);
a61af66fc99e Initial load duke parents: diff changeset	616 trace("4");
a61af66fc99e Initial load duke parents: diff changeset	617
a61af66fc99e Initial load duke parents: diff changeset	618 // All pointers are now adjusted, move objects accordingly
a61af66fc99e Initial load duke parents: diff changeset	619
a61af66fc99e Initial load duke parents: diff changeset	620 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
a61af66fc99e Initial load duke parents: diff changeset	621 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
a61af66fc99e Initial load duke parents: diff changeset	622
a61af66fc99e Initial load duke parents: diff changeset	623 PSYoungGen* young_gen = heap->young_gen();
a61af66fc99e Initial load duke parents: diff changeset	624 PSOldGen* old_gen = heap->old_gen();
a61af66fc99e Initial load duke parents: diff changeset	625
a61af66fc99e Initial load duke parents: diff changeset	626 old_gen->compact();
a61af66fc99e Initial load duke parents: diff changeset	627 young_gen->compact();
a61af66fc99e Initial load duke parents: diff changeset	628 }
a61af66fc99e Initial load duke parents: diff changeset	629
a61af66fc99e Initial load duke parents: diff changeset	630 jlong PSMarkSweep::millis_since_last_gc() {
4712 e7dead7e90af 7117303: VM uses non-monotonic time source and complains that it is non-monotonic johnc parents: 3979 diff changeset	631 // We need a monotonically non-deccreasing time in ms but
e7dead7e90af 7117303: VM uses non-monotonic time source and complains that it is non-monotonic johnc parents: 3979 diff changeset	632 // os::javaTimeMillis() does not guarantee monotonicity.
e7dead7e90af 7117303: VM uses non-monotonic time source and complains that it is non-monotonic johnc parents: 3979 diff changeset	633 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC;
e7dead7e90af 7117303: VM uses non-monotonic time source and complains that it is non-monotonic johnc parents: 3979 diff changeset	634 jlong ret_val = now - _time_of_last_gc;
0 a61af66fc99e Initial load duke parents: diff changeset	635 // XXX See note in genCollectedHeap::millis_since_last_gc().
a61af66fc99e Initial load duke parents: diff changeset	636 if (ret_val < 0) {
4712 e7dead7e90af 7117303: VM uses non-monotonic time source and complains that it is non-monotonic johnc parents: 3979 diff changeset	637 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);)
0 a61af66fc99e Initial load duke parents: diff changeset	638 return 0;
a61af66fc99e Initial load duke parents: diff changeset	639 }
a61af66fc99e Initial load duke parents: diff changeset	640 return ret_val;
a61af66fc99e Initial load duke parents: diff changeset	641 }
a61af66fc99e Initial load duke parents: diff changeset	642
a61af66fc99e Initial load duke parents: diff changeset	643 void PSMarkSweep::reset_millis_since_last_gc() {
4712 e7dead7e90af 7117303: VM uses non-monotonic time source and complains that it is non-monotonic johnc parents: 3979 diff changeset	644 // We need a monotonically non-deccreasing time in ms but
e7dead7e90af 7117303: VM uses non-monotonic time source and complains that it is non-monotonic johnc parents: 3979 diff changeset	645 // os::javaTimeMillis() does not guarantee monotonicity.
e7dead7e90af 7117303: VM uses non-monotonic time source and complains that it is non-monotonic johnc parents: 3979 diff changeset	646 _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC;
0 a61af66fc99e Initial load duke parents: diff changeset	647 }

Mercurial > hg > truffle

annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 10287:12f651e29f6b