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annotate src/share/vm/gc_implementation/g1/vm_operations_g1.cpp @ 23472:047a642c9729

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8065579: WB method to start G1 concurrent mark cycle should be introduced Summary: Add a WhiteBox callback to the VM to start a concurrent mark cycle in G1. Reviewed-by: tschatzl, sjohanss Contributed-by: Leonid Mesnik <leonid.mesnik@oracle.com>
author kevinw
date Wed, 02 Dec 2015 13:58:34 +0530
parents af8f16ac392c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp"
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27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
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28 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
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29 #include "gc_implementation/g1/g1Log.hpp"
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30 #include "gc_implementation/g1/vm_operations_g1.hpp"
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31 #include "gc_implementation/shared/gcTimer.hpp"
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32 #include "gc_implementation/shared/gcTraceTime.hpp"
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33 #include "gc_implementation/shared/isGCActiveMark.hpp"
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34 #include "gc_implementation/g1/vm_operations_g1.hpp"
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35 #include "runtime/interfaceSupport.hpp"
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36
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37 VM_G1CollectForAllocation::VM_G1CollectForAllocation(uint gc_count_before,
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38 size_t word_size)
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39 : VM_G1OperationWithAllocRequest(gc_count_before, word_size,
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40 GCCause::_allocation_failure) {
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41 guarantee(word_size != 0, "An allocation should always be requested with this operation.");
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42 }
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43
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44 void VM_G1CollectForAllocation::doit() {
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45 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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46 GCCauseSetter x(g1h, _gc_cause);
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47
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48 _result = g1h->satisfy_failed_allocation(_word_size, allocation_context(), &_pause_succeeded);
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49 assert(_result == NULL || _pause_succeeded,
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50 "if we get back a result, the pause should have succeeded");
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51 }
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52
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53 void VM_G1CollectFull::doit() {
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54 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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55 GCCauseSetter x(g1h, _gc_cause);
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56 g1h->do_full_collection(false /* clear_all_soft_refs */);
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57 }
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58
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59 VM_G1IncCollectionPause::VM_G1IncCollectionPause(uint gc_count_before,
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60 size_t word_size,
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61 bool should_initiate_conc_mark,
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62 double target_pause_time_ms,
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63 GCCause::Cause gc_cause)
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64 : VM_G1OperationWithAllocRequest(gc_count_before, word_size, gc_cause),
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65 _should_initiate_conc_mark(should_initiate_conc_mark),
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66 _target_pause_time_ms(target_pause_time_ms),
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67 _should_retry_gc(false),
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68 _old_marking_cycles_completed_before(0) {
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69 guarantee(target_pause_time_ms > 0.0,
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70 err_msg("target_pause_time_ms = %1.6lf should be positive",
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71 target_pause_time_ms));
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72 _gc_cause = gc_cause;
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73 }
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74
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75 bool VM_G1IncCollectionPause::doit_prologue() {
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76 bool res = VM_G1OperationWithAllocRequest::doit_prologue();
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77 if (!res) {
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78 if (_should_initiate_conc_mark) {
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79 // The prologue can fail for a couple of reasons. The first is that another GC
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80 // got scheduled and prevented the scheduling of the initial mark GC. The
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81 // second is that the GC locker may be active and the heap can't be expanded.
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82 // In both cases we want to retry the GC so that the initial mark pause is
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83 // actually scheduled. In the second case, however, we should stall until
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84 // until the GC locker is no longer active and then retry the initial mark GC.
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85 _should_retry_gc = true;
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86 }
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87 }
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88 return res;
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89 }
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90
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91 void VM_G1IncCollectionPause::doit() {
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92 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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93 assert(!_should_initiate_conc_mark || g1h->should_do_concurrent_full_gc(_gc_cause),
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94 "only a GC locker, a System.gc(), stats update, whitebox, or a hum allocation induced GC should start a cycle");
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95
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96 if (_word_size > 0) {
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97 // An allocation has been requested. So, try to do that first.
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98 _result = g1h->attempt_allocation_at_safepoint(_word_size, allocation_context(),
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99 false /* expect_null_cur_alloc_region */);
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100 if (_result != NULL) {
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101 // If we can successfully allocate before we actually do the
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102 // pause then we will consider this pause successful.
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103 _pause_succeeded = true;
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104 return;
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105 }
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106 }
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107
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108 GCCauseSetter x(g1h, _gc_cause);
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109 if (_should_initiate_conc_mark) {
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110 // It's safer to read old_marking_cycles_completed() here, given
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111 // that noone else will be updating it concurrently. Since we'll
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112 // only need it if we're initiating a marking cycle, no point in
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113 // setting it earlier.
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114 _old_marking_cycles_completed_before = g1h->old_marking_cycles_completed();
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115
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116 // At this point we are supposed to start a concurrent cycle. We
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117 // will do so if one is not already in progress.
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118 bool res = g1h->g1_policy()->force_initial_mark_if_outside_cycle(_gc_cause);
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119
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120 // The above routine returns true if we were able to force the
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121 // next GC pause to be an initial mark; it returns false if a
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122 // marking cycle is already in progress.
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123 //
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124 // If a marking cycle is already in progress just return and skip the
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125 // pause below - if the reason for requesting this initial mark pause
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126 // was due to a System.gc() then the requesting thread should block in
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127 // doit_epilogue() until the marking cycle is complete.
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128 //
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129 // If this initial mark pause was requested as part of a humongous
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130 // allocation then we know that the marking cycle must just have
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131 // been started by another thread (possibly also allocating a humongous
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132 // object) as there was no active marking cycle when the requesting
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133 // thread checked before calling collect() in
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134 // attempt_allocation_humongous(). Retrying the GC, in this case,
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135 // will cause the requesting thread to spin inside collect() until the
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136 // just started marking cycle is complete - which may be a while. So
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137 // we do NOT retry the GC.
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138 if (!res) {
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139 assert(_word_size == 0, "Concurrent Full GC/Humongous Object IM shouldn't be allocating");
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140 if (_gc_cause != GCCause::_g1_humongous_allocation) {
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141 _should_retry_gc = true;
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
142 }
3773
5130fa1b24f1 7045751: G1: +ExplicitGCInvokesConcurrent causes excessive single region evacuation pauses
johnc
parents: 2426
diff changeset
143 return;
5130fa1b24f1 7045751: G1: +ExplicitGCInvokesConcurrent causes excessive single region evacuation pauses
johnc
parents: 2426
diff changeset
144 }
1656
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
145 }
1973
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
146
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
147 _pause_succeeded =
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
148 g1h->do_collection_pause_at_safepoint(_target_pause_time_ms);
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
149 if (_pause_succeeded && _word_size > 0) {
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
150 // An allocation had been requested.
20404
227a9e5e4b4a 8057536: Refactor G1 to allow context specific allocations
sjohanss
parents: 20190
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151 _result = g1h->attempt_allocation_at_safepoint(_word_size, allocation_context(),
1973
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
152 true /* expect_null_cur_alloc_region */);
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
153 } else {
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
154 assert(_result == NULL, "invariant");
5963
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
155 if (!_pause_succeeded) {
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
156 // Another possible reason reason for the pause to not be successful
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
157 // is that, again, the GC locker is active (and has become active
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
158 // since the prologue was executed). In this case we should retry
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
159 // the pause after waiting for the GC locker to become inactive.
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
160 _should_retry_gc = true;
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
161 }
1973
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
162 }
1656
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
163 }
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
164
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
165 void VM_G1IncCollectionPause::doit_epilogue() {
22937
af8f16ac392c 8066771: Refactor VM GC operations caused by allocation failure
mlarsson
parents: 22936
diff changeset
166 VM_G1OperationWithAllocRequest::doit_epilogue();
1656
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
167
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
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diff changeset
168 // If the pause was initiated by a System.gc() and
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
169 // +ExplicitGCInvokesConcurrent, we have to wait here for the cycle
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
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170 // that just started (or maybe one that was already in progress) to
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
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171 // finish.
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
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172 if (_gc_cause == GCCause::_java_lang_system_gc &&
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
173 _should_initiate_conc_mark) {
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
174 assert(ExplicitGCInvokesConcurrent,
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
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175 "the only way to be here is if ExplicitGCInvokesConcurrent is set");
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
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diff changeset
176
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
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177 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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tonyp
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178
6120
37552638d24a 7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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179 // In the doit() method we saved g1h->old_marking_cycles_completed()
37552638d24a 7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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180 // in the _old_marking_cycles_completed_before field. We have to
37552638d24a 7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents: 6062
diff changeset
181 // wait until we observe that g1h->old_marking_cycles_completed()
1656
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tonyp
parents: 1552
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182 // has increased by at least one. This can happen if a) we started
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
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183 // a cycle and it completes, b) a cycle already in progress
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
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184 // completes, or c) a Full GC happens.
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
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185
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tonyp
parents: 1552
diff changeset
186 // If the condition has already been reached, there's no point in
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
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187 // actually taking the lock and doing the wait.
6120
37552638d24a 7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents: 6062
diff changeset
188 if (g1h->old_marking_cycles_completed() <=
37552638d24a 7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents: 6062
diff changeset
189 _old_marking_cycles_completed_before) {
1656
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
190 // The following is largely copied from CMS
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
191
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
192 Thread* thr = Thread::current();
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
193 assert(thr->is_Java_thread(), "invariant");
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
194 JavaThread* jt = (JavaThread*)thr;
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
195 ThreadToNativeFromVM native(jt);
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
196
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
197 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag);
6120
37552638d24a 7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents: 6062
diff changeset
198 while (g1h->old_marking_cycles_completed() <=
37552638d24a 7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents: 6062
diff changeset
199 _old_marking_cycles_completed_before) {
1656
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
200 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag);
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
201 }
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
202 }
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
203 }
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
204 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
205
4022
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
206 void VM_CGC_Operation::acquire_pending_list_lock() {
5963
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
207 assert(_needs_pll, "don't call this otherwise");
4022
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
208 // The caller may block while communicating
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
209 // with the SLT thread in order to acquire/release the PLL.
20646
4e4ebe50c8e3 8062036: ConcurrentMarkThread::slt may be invoked before ConcurrentMarkThread::makeSurrogateLockerThread causing intermittent crashes
kbarrett
parents: 20522
diff changeset
210 SurrogateLockerThread* slt = ConcurrentMarkThread::slt();
4e4ebe50c8e3 8062036: ConcurrentMarkThread::slt may be invoked before ConcurrentMarkThread::makeSurrogateLockerThread causing intermittent crashes
kbarrett
parents: 20522
diff changeset
211 if (slt != NULL) {
4e4ebe50c8e3 8062036: ConcurrentMarkThread::slt may be invoked before ConcurrentMarkThread::makeSurrogateLockerThread causing intermittent crashes
kbarrett
parents: 20522
diff changeset
212 slt->manipulatePLL(SurrogateLockerThread::acquirePLL);
4e4ebe50c8e3 8062036: ConcurrentMarkThread::slt may be invoked before ConcurrentMarkThread::makeSurrogateLockerThread causing intermittent crashes
kbarrett
parents: 20522
diff changeset
213 } else {
4e4ebe50c8e3 8062036: ConcurrentMarkThread::slt may be invoked before ConcurrentMarkThread::makeSurrogateLockerThread causing intermittent crashes
kbarrett
parents: 20522
diff changeset
214 SurrogateLockerThread::report_missing_slt();
4e4ebe50c8e3 8062036: ConcurrentMarkThread::slt may be invoked before ConcurrentMarkThread::makeSurrogateLockerThread causing intermittent crashes
kbarrett
parents: 20522
diff changeset
215 }
4022
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
216 }
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
217
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
218 void VM_CGC_Operation::release_and_notify_pending_list_lock() {
5963
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
219 assert(_needs_pll, "don't call this otherwise");
4022
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
220 // The caller may block while communicating
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
221 // with the SLT thread in order to acquire/release the PLL.
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
222 ConcurrentMarkThread::slt()->
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
223 manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL);
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
224 }
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
225
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
226 void VM_CGC_Operation::doit() {
6007
5c86f8211d1e 7160728: Introduce an extra logging level for G1 logging
brutisso
parents: 5963
diff changeset
227 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty);
20190
0982ec23da03 8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents: 12113
diff changeset
228 GCTraceTime t(_printGCMessage, G1Log::fine(), true, G1CollectedHeap::heap()->gc_timer_cm(), G1CollectedHeap::heap()->concurrent_mark()->concurrent_gc_id());
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
229 SharedHeap* sh = SharedHeap::heap();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
230 // This could go away if CollectedHeap gave access to _gc_is_active...
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
231 if (sh != NULL) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
232 IsGCActiveMark x;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
233 _cl->do_void();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
234 } else {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
235 _cl->do_void();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
236 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
237 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
238
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
239 bool VM_CGC_Operation::doit_prologue() {
4022
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
240 // Note the relative order of the locks must match that in
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
241 // VM_GC_Operation::doit_prologue() or deadlocks can occur
5963
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
242 if (_needs_pll) {
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
243 acquire_pending_list_lock();
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
244 }
4022
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
245
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
246 Heap_lock->lock();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
247 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = true;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
248 return true;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
249 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
250
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
251 void VM_CGC_Operation::doit_epilogue() {
4022
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
252 // Note the relative order of the unlocks must match that in
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
253 // VM_GC_Operation::doit_epilogue()
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
254 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = false;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
255 Heap_lock->unlock();
5963
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
256 if (_needs_pll) {
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
257 release_and_notify_pending_list_lock();
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
258 }
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
259 }