graal-jvmci-8: src/share/vm/gc_implementation/g1/g1MarkSweep.cpp annotate

annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 20304:a22acf6d7598

8048112: G1 Full GC needs to support the case when the very first region is not available Summary: Refactor preparation for compaction during Full GC so that it lazily initializes the first compaction point. This also avoids problems later when the first region may not be committed. Also reviewed by K. Barrett. Reviewed-by: brutisso

author	tschatzl
date	Mon, 21 Jul 2014 10:00:31 +0200
parents	2c6ef90f030a
children	d35872270666

rev	line source
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	1 /*
17764 595c0f60d50d 8029075: String deduplication in G1 pliden parents: 17736 diff changeset	2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	4 *
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	7 * published by the Free Software Foundation.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	8 *
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	13 * accompanied this code).
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	14 *
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr 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.
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	22 *
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	23 */
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr 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/javaClasses.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	27 #include "classfile/symbolTable.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	28 #include "classfile/systemDictionary.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	29 #include "classfile/vmSymbols.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	30 #include "code/codeCache.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	31 #include "code/icBuffer.hpp"
6007 5c86f8211d1e 7160728: Introduce an extra logging level for G1 logging brutisso parents: 4872 diff changeset	32 #include "gc_implementation/g1/g1Log.hpp"
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	33 #include "gc_implementation/g1/g1MarkSweep.hpp"
17764 595c0f60d50d 8029075: String deduplication in G1 pliden parents: 17736 diff changeset	34 #include "gc_implementation/g1/g1StringDedup.hpp"
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 10188 diff changeset	35 #include "gc_implementation/shared/gcHeapSummary.hpp"
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 10188 diff changeset	36 #include "gc_implementation/shared/gcTimer.hpp"
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 10188 diff changeset	37 #include "gc_implementation/shared/gcTrace.hpp"
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 10188 diff changeset	38 #include "gc_implementation/shared/gcTraceTime.hpp"
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	39 #include "memory/gcLocker.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	40 #include "memory/genCollectedHeap.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	41 #include "memory/modRefBarrierSet.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/space.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	44 #include "oops/instanceRefKlass.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	45 #include "oops/oop.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	46 #include "prims/jvmtiExport.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	47 #include "runtime/biasedLocking.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	48 #include "runtime/fprofiler.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	49 #include "runtime/synchronizer.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	50 #include "runtime/thread.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	51 #include "runtime/vmThread.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	52 #include "utilities/copy.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1836 diff changeset	53 #include "utilities/events.hpp"
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	54
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	55 class HeapRegion;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	56
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	57 void G1MarkSweep::invoke_at_safepoint(ReferenceProcessor* rp,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	58 bool clear_all_softrefs) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	59 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	60
1387 0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	61 SharedHeap* sh = SharedHeap::heap();
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	62 #ifdef ASSERT
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	63 if (sh->collector_policy()->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	64 assert(clear_all_softrefs, "Policy should have been checked earler");
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	65 }
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. jmasa parents: 1311 diff changeset	66 #endif
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	67 // hook up weak ref data so it can be used during Mark-Sweep
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	68 assert(GenMarkSweep::ref_processor() == NULL, "no stomping");
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 358 diff changeset	69 assert(rp != NULL, "should be non-NULL");
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3772 diff changeset	70 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Precondition");
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3772 diff changeset	71
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	72 GenMarkSweep::_ref_processor = rp;
457 27a80744a83b 6778647: snap(), snap_policy() should be renamed setup(), setup_policy() ysr parents: 453 diff changeset	73 rp->setup_policy(clear_all_softrefs);
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	74
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6254 diff changeset	75 // When collecting the permanent generation Method*s may be moving,
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	76 // so we either have to flush all bcp data or convert it into bci.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	77 CodeCache::gc_prologue();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	78 Threads::gc_prologue();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	79
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	80 bool marked_for_unloading = false;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	81
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	82 allocate_stacks();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	83
358 8651a65ac4b4 6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails iveresov parents: 342 diff changeset	84 // We should save the marks of the currently locked biased monitors.
8651a65ac4b4 6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails iveresov parents: 342 diff changeset	85 // The marking doesn't preserve the marks of biased objects.
8651a65ac4b4 6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails iveresov parents: 342 diff changeset	86 BiasedLocking::preserve_marks();
8651a65ac4b4 6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails iveresov parents: 342 diff changeset	87
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	88 mark_sweep_phase1(marked_for_unloading, clear_all_softrefs);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	89
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	90 mark_sweep_phase2();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	91
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	92 // Don't add any more derived pointers during phase3
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	93 COMPILER2_PRESENT(DerivedPointerTable::set_active(false));
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	94
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	95 mark_sweep_phase3();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	96
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	97 mark_sweep_phase4();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	98
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	99 GenMarkSweep::restore_marks();
358 8651a65ac4b4 6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails iveresov parents: 342 diff changeset	100 BiasedLocking::restore_marks();
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	101 GenMarkSweep::deallocate_stacks();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	102
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	103 // "free at last gc" is calculated from these.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	104 // CHF: cheating for now!!!
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	105 // Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity());
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	106 // Universe::set_heap_used_at_last_gc(Universe::heap()->used());
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	107
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	108 Threads::gc_epilogue();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	109 CodeCache::gc_epilogue();
2147 9afee0b9fc1d 7012505: BreakpointWithFullGC.sh fails with Internal Error (src/share/vm/oops/methodOop.cpp:220) kamg parents: 1972 diff changeset	110 JvmtiExport::gc_epilogue();
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	111
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	112 // refs processing: clean slate
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	113 GenMarkSweep::_ref_processor = NULL;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	114 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	115
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	116
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	117 void G1MarkSweep::allocate_stacks() {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	118 GenMarkSweep::_preserved_count_max = 0;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	119 GenMarkSweep::_preserved_marks = NULL;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	120 GenMarkSweep::_preserved_count = 0;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	121 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	122
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	123 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	124 bool clear_all_softrefs) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	125 // Recursively traverse all live objects and mark them
20190 0982ec23da03 8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps brutisso parents: 17764 diff changeset	126 GCTraceTime tm("phase 1", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id());
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	127 GenMarkSweep::trace(" 1");
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	128
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	129 SharedHeap* sh = SharedHeap::heap();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	130
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20258 diff changeset	131 // Need cleared claim bits for the roots processing
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6254 diff changeset	132 ClassLoaderDataGraph::clear_claimed_marks();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6254 diff changeset	133
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20258 diff changeset	134 MarkingCodeBlobClosure follow_code_closure(&GenMarkSweep::follow_root_closure, !CodeBlobToOopClosure::FixRelocations);
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20258 diff changeset	135 sh->process_strong_roots(true, // activate StrongRootsScope
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20258 diff changeset	136 SharedHeap::SO_None,
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	137 &GenMarkSweep::follow_root_closure,
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20258 diff changeset	138 &GenMarkSweep::follow_cld_closure,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20258 diff changeset	139 &follow_code_closure);
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	140
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	141 // Process reference objects found during marking
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 358 diff changeset	142 ReferenceProcessor* rp = GenMarkSweep::ref_processor();
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3772 diff changeset	143 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Sanity");
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3772 diff changeset	144
457 27a80744a83b 6778647: snap(), snap_policy() should be renamed setup(), setup_policy() ysr parents: 453 diff changeset	145 rp->setup_policy(clear_all_softrefs);
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 10188 diff changeset	146 const ReferenceProcessorStats& stats =
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 10188 diff changeset	147 rp->process_discovered_references(&GenMarkSweep::is_alive,
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 10188 diff changeset	148 &GenMarkSweep::keep_alive,
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 10188 diff changeset	149 &GenMarkSweep::follow_stack_closure,
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 10188 diff changeset	150 NULL,
20190 0982ec23da03 8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps brutisso parents: 17764 diff changeset	151 gc_timer(),
0982ec23da03 8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps brutisso parents: 17764 diff changeset	152 gc_tracer()->gc_id());
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 10188 diff changeset	153 gc_tracer()->report_gc_reference_stats(stats);
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	154
10188 2f50bc369470 8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading stefank parents: 10186 diff changeset	155
2f50bc369470 8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading stefank parents: 10186 diff changeset	156 // 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	157 assert(GenMarkSweep::_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	158
2f50bc369470 8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading stefank parents: 10186 diff changeset	159 // Unload classes and purge the SystemDictionary.
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	160 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	161
10188 2f50bc369470 8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading stefank parents: 10186 diff changeset	162 // Unload nmethods.
6787 8966c2d65d96 7200470: KeepAliveClosure not needed in CodeCache::do_unloading brutisso parents: 6725 diff changeset	163 CodeCache::do_unloading(&GenMarkSweep::is_alive, purged_class);
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	164
10188 2f50bc369470 8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading stefank parents: 10186 diff changeset	165 // Prune dead klasses from subklass/sibling/implementor lists.
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6254 diff changeset	166 Klass::clean_weak_klass_links(&GenMarkSweep::is_alive);
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	167
17634 5a32d2a3cc1e 8027476: Improve performance of Stringtable unlink tschatzl parents: 12343 diff changeset	168 // Delete entries for dead interned string and clean up unreferenced symbols in symbol table.
5a32d2a3cc1e 8027476: Improve performance of Stringtable unlink tschatzl parents: 12343 diff changeset	169 G1CollectedHeap::heap()->unlink_string_and_symbol_table(&GenMarkSweep::is_alive);
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	170
3772 6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	171 if (VerifyDuringGC) {
6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	172 HandleMark hm; // handle scope
6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	173 COMPILER2_PRESENT(DerivedPointerTableDeactivate dpt_deact);
6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	174 Universe::heap()->prepare_for_verify();
6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	175 // Note: we can verify only the heap here. When an object is
6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	176 // marked, the previous value of the mark word (including
6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	177 // identity hash values, ages, etc) is preserved, and the mark
6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	178 // word is set to markOop::marked_value - effectively removing
6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	179 // any hash values from the mark word. These hash values are
6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	180 // used when verifying the dictionaries and so removing them
6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	181 // from the mark word can make verification of the dictionaries
6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	182 // fail. At the end of the GC, the orginal mark word values
6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	183 // (including hash values) are restored to the appropriate
6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	184 // objects.
10186 b06ac540229e 8013132: Add a flag to turn off the output of the verbose verification code stefank parents: 10179 diff changeset	185 if (!VerifySilently) {
b06ac540229e 8013132: Add a flag to turn off the output of the verbose verification code stefank parents: 10179 diff changeset	186 gclog_or_tty->print(" VerifyDuringGC:(full)[Verifying ");
b06ac540229e 8013132: Add a flag to turn off the output of the verbose verification code stefank parents: 10179 diff changeset	187 }
b06ac540229e 8013132: Add a flag to turn off the output of the verbose verification code stefank parents: 10179 diff changeset	188 Universe::heap()->verify(VerifySilently, VerifyOption_G1UseMarkWord);
b06ac540229e 8013132: Add a flag to turn off the output of the verbose verification code stefank parents: 10179 diff changeset	189 if (!VerifySilently) {
b06ac540229e 8013132: Add a flag to turn off the output of the verbose verification code stefank parents: 10179 diff changeset	190 gclog_or_tty->print_cr("]");
b06ac540229e 8013132: Add a flag to turn off the output of the verbose verification code stefank parents: 10179 diff changeset	191 }
3772 6747fd0512e0 7004681: G1: Extend marking verification to Full GCs johnc parents: 2361 diff changeset	192 }
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 10188 diff changeset	193
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 10188 diff changeset	194 gc_tracer()->report_object_count_after_gc(&GenMarkSweep::is_alive);
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	195 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	196
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	197 class G1PrepareCompactClosure: public HeapRegionClosure {
2152 0fa27f37d4d4 6977804: G1: remove the zero-filling thread tonyp parents: 1972 diff changeset	198 G1CollectedHeap* _g1h;
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	199 ModRefBarrierSet* _mrbs;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	200 CompactPoint _cp;
17736 58fc1b1523dc 8034079: G1: Refactor the HeapRegionSet hierarchy brutisso parents: 17634 diff changeset	201 HeapRegionSetCount _humongous_regions_removed;
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	202
20304 a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	203 bool is_cp_initialized() const {
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	204 return _cp.space != NULL;
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	205 }
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	206
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	207 void prepare_for_compaction(HeapRegion* hr, HeapWord* end) {
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	208 // If this is the first live region that we came across which we can compact,
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	209 // initialize the CompactPoint.
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	210 if (!is_cp_initialized()) {
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	211 _cp.space = hr;
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	212 _cp.threshold = hr->initialize_threshold();
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	213 }
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	214 hr->prepare_for_compaction(&_cp);
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	215 // Also clear the part of the card table that will be unused after
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	216 // compaction.
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	217 _mrbs->clear(MemRegion(hr->compaction_top(), end));
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	218 }
a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	219
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	220 void free_humongous_region(HeapRegion* hr) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	221 HeapWord* end = hr->end();
2361 1216415d8e35 7014923: G1: code cleanup tonyp parents: 2177 diff changeset	222 FreeRegionList dummy_free_list("Dummy Free List for G1MarkSweep");
1216415d8e35 7014923: G1: code cleanup tonyp parents: 2177 diff changeset	223
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	224 assert(hr->startsHumongous(),
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	225 "Only the start of a humongous region should be freed.");
17736 58fc1b1523dc 8034079: G1: Refactor the HeapRegionSet hierarchy brutisso parents: 17634 diff changeset	226
58fc1b1523dc 8034079: G1: Refactor the HeapRegionSet hierarchy brutisso parents: 17634 diff changeset	227 hr->set_containing_set(NULL);
58fc1b1523dc 8034079: G1: Refactor the HeapRegionSet hierarchy brutisso parents: 17634 diff changeset	228 _humongous_regions_removed.increment(1u, hr->capacity());
58fc1b1523dc 8034079: G1: Refactor the HeapRegionSet hierarchy brutisso parents: 17634 diff changeset	229
58fc1b1523dc 8034079: G1: Refactor the HeapRegionSet hierarchy brutisso parents: 17634 diff changeset	230 _g1h->free_humongous_region(hr, &dummy_free_list, false /* par */);
20304 a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	231 prepare_for_compaction(hr, end);
2361 1216415d8e35 7014923: G1: code cleanup tonyp parents: 2177 diff changeset	232 dummy_free_list.remove_all();
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	233 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	234
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	235 public:
20304 a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	236 G1PrepareCompactClosure()
2152 0fa27f37d4d4 6977804: G1: remove the zero-filling thread tonyp parents: 1972 diff changeset	237 : _g1h(G1CollectedHeap::heap()),
12343 d55c004e1d4d 8025305: Cleanup CardTableModRefBS usage in G1 mgerdin parents: 11096 diff changeset	238 _mrbs(_g1h->g1_barrier_set()),
20304 a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	239 _cp(NULL),
17736 58fc1b1523dc 8034079: G1: Refactor the HeapRegionSet hierarchy brutisso parents: 17634 diff changeset	240 _humongous_regions_removed() { }
2152 0fa27f37d4d4 6977804: G1: remove the zero-filling thread tonyp parents: 1972 diff changeset	241
0fa27f37d4d4 6977804: G1: remove the zero-filling thread tonyp parents: 1972 diff changeset	242 void update_sets() {
0fa27f37d4d4 6977804: G1: remove the zero-filling thread tonyp parents: 1972 diff changeset	243 // We'll recalculate total used bytes and recreate the free list
0fa27f37d4d4 6977804: G1: remove the zero-filling thread tonyp parents: 1972 diff changeset	244 // at the end of the GC, so no point in updating those values here.
17736 58fc1b1523dc 8034079: G1: Refactor the HeapRegionSet hierarchy brutisso parents: 17634 diff changeset	245 HeapRegionSetCount empty_set;
58fc1b1523dc 8034079: G1: Refactor the HeapRegionSet hierarchy brutisso parents: 17634 diff changeset	246 _g1h->remove_from_old_sets(empty_set, _humongous_regions_removed);
2152 0fa27f37d4d4 6977804: G1: remove the zero-filling thread tonyp parents: 1972 diff changeset	247 }
0fa27f37d4d4 6977804: G1: remove the zero-filling thread tonyp parents: 1972 diff changeset	248
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	249 bool doHeapRegion(HeapRegion* hr) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	250 if (hr->isHumongous()) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	251 if (hr->startsHumongous()) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	252 oop obj = oop(hr->bottom());
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	253 if (obj->is_gc_marked()) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	254 obj->forward_to(obj);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	255 } else {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	256 free_humongous_region(hr);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	257 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	258 } else {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	259 assert(hr->continuesHumongous(), "Invalid humongous.");
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	260 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	261 } else {
20304 a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	262 prepare_for_compaction(hr, hr->end());
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	263 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	264 return false;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	265 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	266 };
677 96b229c54d1e 6543938: G1: remove the concept of popularity apetrusenko parents: 470 diff changeset	267
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	268 void G1MarkSweep::mark_sweep_phase2() {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	269 // Now all live objects are marked, compute the new object addresses.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	270
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	271 // It is not required that we traverse spaces in the same order in
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	272 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	273 // tracking expects us to do so. See comment under phase4.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	274
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	275 G1CollectedHeap* g1h = G1CollectedHeap::heap();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	276
20190 0982ec23da03 8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps brutisso parents: 17764 diff changeset	277 GCTraceTime tm("phase 2", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id());
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	278 GenMarkSweep::trace("2");
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	279
20304 a22acf6d7598 8048112: G1 Full GC needs to support the case when the very first region is not available tschatzl parents: 20278 diff changeset	280 G1PrepareCompactClosure blk;
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	281 g1h->heap_region_iterate(&blk);
2152 0fa27f37d4d4 6977804: G1: remove the zero-filling thread tonyp parents: 1972 diff changeset	282 blk.update_sets();
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	283 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	284
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	285 class G1AdjustPointersClosure: public HeapRegionClosure {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	286 public:
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	287 bool doHeapRegion(HeapRegion* r) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	288 if (r->isHumongous()) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	289 if (r->startsHumongous()) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	290 // We must adjust the pointers on the single H object.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	291 oop obj = oop(r->bottom());
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	292 // point all the oops to the new location
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	293 obj->adjust_pointers();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	294 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	295 } else {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	296 // This really ought to be "as_CompactibleSpace"...
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	297 r->adjust_pointers();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	298 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	299 return false;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	300 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	301 };
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	302
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	303 void G1MarkSweep::mark_sweep_phase3() {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	304 G1CollectedHeap* g1h = G1CollectedHeap::heap();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	305
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	306 // Adjust the pointers to reflect the new locations
20190 0982ec23da03 8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps brutisso parents: 17764 diff changeset	307 GCTraceTime tm("phase 3", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id());
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	308 GenMarkSweep::trace("3");
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	309
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	310 SharedHeap* sh = SharedHeap::heap();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	311
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20258 diff changeset	312 // Need cleared claim bits for the roots processing
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6254 diff changeset	313 ClassLoaderDataGraph::clear_claimed_marks();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6254 diff changeset	314
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20258 diff changeset	315 CodeBlobToOopClosure adjust_code_closure(&GenMarkSweep::adjust_pointer_closure, CodeBlobToOopClosure::FixRelocations);
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20258 diff changeset	316 sh->process_all_roots(true, // activate StrongRootsScope
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20258 diff changeset	317 SharedHeap::SO_AllCodeCache,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20258 diff changeset	318 &GenMarkSweep::adjust_pointer_closure,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20258 diff changeset	319 &GenMarkSweep::adjust_cld_closure,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20258 diff changeset	320 &adjust_code_closure);
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	321
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3772 diff changeset	322 assert(GenMarkSweep::ref_processor() == g1h->ref_processor_stw(), "Sanity");
10179 a08c80e9e1e5 8012687: Remove unused is_root checks and closures stefank parents: 7448 diff changeset	323 g1h->ref_processor_stw()->weak_oops_do(&GenMarkSweep::adjust_pointer_closure);
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	324
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	325 // Now adjust pointers in remaining weak roots. (All of which should
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	326 // have been cleared if they pointed to non-surviving objects.)
20257 7426d8d76305 8034761: Remove the do_code_roots parameter from process_strong_roots stefank parents: 20254 diff changeset	327 sh->process_weak_roots(&GenMarkSweep::adjust_pointer_closure);
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	328
17764 595c0f60d50d 8029075: String deduplication in G1 pliden parents: 17736 diff changeset	329 if (G1StringDedup::is_enabled()) {
595c0f60d50d 8029075: String deduplication in G1 pliden parents: 17736 diff changeset	330 G1StringDedup::oops_do(&GenMarkSweep::adjust_pointer_closure);
595c0f60d50d 8029075: String deduplication in G1 pliden parents: 17736 diff changeset	331 }
595c0f60d50d 8029075: String deduplication in G1 pliden parents: 17736 diff changeset	332
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	333 GenMarkSweep::adjust_marks();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	334
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	335 G1AdjustPointersClosure blk;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	336 g1h->heap_region_iterate(&blk);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	337 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	338
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	339 class G1SpaceCompactClosure: public HeapRegionClosure {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	340 public:
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	341 G1SpaceCompactClosure() {}
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	343 bool doHeapRegion(HeapRegion* hr) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	344 if (hr->isHumongous()) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	345 if (hr->startsHumongous()) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	346 oop obj = oop(hr->bottom());
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	347 if (obj->is_gc_marked()) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	348 obj->init_mark();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	349 } else {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	350 assert(hr->is_empty(), "Should have been cleared in phase 2.");
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	351 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	352 hr->reset_during_compaction();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	353 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	354 } else {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	355 hr->compact();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	356 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	357 return false;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	358 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	359 };
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	360
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	361 void G1MarkSweep::mark_sweep_phase4() {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	362 // All pointers are now adjusted, move objects accordingly
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	363
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	364 // The ValidateMarkSweep live oops tracking expects us to traverse spaces
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	365 // in the same order in phase2, phase3 and phase4. We don't quite do that
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6254 diff changeset	366 // here (code and comment not fixed for perm removal), so we tell the validate code
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	367 // to use a higher index (saved from phase2) when verifying perm_gen.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	368 G1CollectedHeap* g1h = G1CollectedHeap::heap();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	369
20190 0982ec23da03 8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps brutisso parents: 17764 diff changeset	370 GCTraceTime tm("phase 4", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id());
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	371 GenMarkSweep::trace("4");
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	372
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	373 G1SpaceCompactClosure blk;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	374 g1h->heap_region_iterate(&blk);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	375
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: diff changeset	376 }

Mercurial > hg > graal-jvmci-8

annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 20304:a22acf6d7598