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annotate src/share/vm/gc_implementation/g1/vm_operations_g1.cpp @ 20404:227a9e5e4b4a

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8057536: Refactor G1 to allow context specific allocations Summary: Splitting out a g1 allocator class to simply specialized allocators which can associate each allocation with a given context. Reviewed-by: mgerdin, brutisso
author sjohanss
date Fri, 05 Sep 2014 09:49:19 +0200
parents 0982ec23da03
children d3fd73295885
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * Copyright (c) 2001, 2013, 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(
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38 unsigned int gc_count_before,
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39 size_t word_size)
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40 : VM_G1OperationWithAllocRequest(gc_count_before, word_size,
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41 GCCause::_allocation_failure) {
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42 guarantee(word_size > 0, "an allocation should always be requested");
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43 }
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44
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45 void VM_G1CollectForAllocation::doit() {
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46 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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47 GCCauseSetter x(g1h, _gc_cause);
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48
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49 _result = g1h->satisfy_failed_allocation(_word_size, allocation_context(), &_pause_succeeded);
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50 assert(_result == NULL || _pause_succeeded,
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51 "if we get back a result, the pause should have succeeded");
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52 }
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53
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54 void VM_G1CollectFull::doit() {
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55 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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56 GCCauseSetter x(g1h, _gc_cause);
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57 g1h->do_full_collection(false /* clear_all_soft_refs */);
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58 }
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59
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60 VM_G1IncCollectionPause::VM_G1IncCollectionPause(
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61 unsigned int gc_count_before,
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62 size_t word_size,
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63 bool should_initiate_conc_mark,
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64 double target_pause_time_ms,
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65 GCCause::Cause gc_cause)
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66 : VM_G1OperationWithAllocRequest(gc_count_before, word_size, gc_cause),
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67 _should_initiate_conc_mark(should_initiate_conc_mark),
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68 _target_pause_time_ms(target_pause_time_ms),
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69 _should_retry_gc(false),
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70 _old_marking_cycles_completed_before(0) {
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71 guarantee(target_pause_time_ms > 0.0,
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72 err_msg("target_pause_time_ms = %1.6lf should be positive",
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73 target_pause_time_ms));
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74 _gc_cause = gc_cause;
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75 }
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76
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77 bool VM_G1IncCollectionPause::doit_prologue() {
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78 bool res = VM_GC_Operation::doit_prologue();
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79 if (!res) {
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80 if (_should_initiate_conc_mark) {
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81 // The prologue can fail for a couple of reasons. The first is that another GC
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82 // got scheduled and prevented the scheduling of the initial mark GC. The
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83 // second is that the GC locker may be active and the heap can't be expanded.
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84 // In both cases we want to retry the GC so that the initial mark pause is
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85 // actually scheduled. In the second case, however, we should stall until
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86 // until the GC locker is no longer active and then retry the initial mark GC.
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87 _should_retry_gc = true;
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88 }
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89 }
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90 return res;
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91 }
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92
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93 void VM_G1IncCollectionPause::doit() {
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94 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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95 assert(!_should_initiate_conc_mark ||
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96 ((_gc_cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) ||
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97 (_gc_cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent) ||
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98 _gc_cause == GCCause::_g1_humongous_allocation),
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99 "only a GC locker, a System.gc() or a hum allocation induced GC should start a cycle");
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100
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101 if (_word_size > 0) {
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102 // An allocation has been requested. So, try to do that first.
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103 _result = g1h->attempt_allocation_at_safepoint(_word_size, allocation_context(),
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104 false /* expect_null_cur_alloc_region */);
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105 if (_result != NULL) {
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106 // If we can successfully allocate before we actually do the
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107 // pause then we will consider this pause successful.
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108 _pause_succeeded = true;
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109 return;
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110 }
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111 }
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112
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113 GCCauseSetter x(g1h, _gc_cause);
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114 if (_should_initiate_conc_mark) {
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115 // It's safer to read old_marking_cycles_completed() here, given
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116 // that noone else will be updating it concurrently. Since we'll
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117 // only need it if we're initiating a marking cycle, no point in
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118 // setting it earlier.
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119 _old_marking_cycles_completed_before = g1h->old_marking_cycles_completed();
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120
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121 // At this point we are supposed to start a concurrent cycle. We
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122 // will do so if one is not already in progress.
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123 bool res = g1h->g1_policy()->force_initial_mark_if_outside_cycle(_gc_cause);
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124
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125 // The above routine returns true if we were able to force the
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126 // next GC pause to be an initial mark; it returns false if a
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127 // marking cycle is already in progress.
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128 //
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129 // If a marking cycle is already in progress just return and skip the
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130 // pause below - if the reason for requesting this initial mark pause
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131 // was due to a System.gc() then the requesting thread should block in
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132 // doit_epilogue() until the marking cycle is complete.
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133 //
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134 // If this initial mark pause was requested as part of a humongous
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135 // allocation then we know that the marking cycle must just have
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136 // been started by another thread (possibly also allocating a humongous
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137 // object) as there was no active marking cycle when the requesting
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138 // thread checked before calling collect() in
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139 // attempt_allocation_humongous(). Retrying the GC, in this case,
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140 // will cause the requesting thread to spin inside collect() until the
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141 // just started marking cycle is complete - which may be a while. So
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142 // we do NOT retry the GC.
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5130fa1b24f1 7045751: G1: +ExplicitGCInvokesConcurrent causes excessive single region evacuation pauses
johnc
parents: 2426
diff changeset
143 if (!res) {
5963
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
144 assert(_word_size == 0, "Concurrent Full GC/Humongous Object IM shouldn't be allocating");
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
145 if (_gc_cause != GCCause::_g1_humongous_allocation) {
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
146 _should_retry_gc = true;
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
147 }
3773
5130fa1b24f1 7045751: G1: +ExplicitGCInvokesConcurrent causes excessive single region evacuation pauses
johnc
parents: 2426
diff changeset
148 return;
5130fa1b24f1 7045751: G1: +ExplicitGCInvokesConcurrent causes excessive single region evacuation pauses
johnc
parents: 2426
diff changeset
149 }
1656
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
150 }
1973
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
151
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
152 _pause_succeeded =
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
153 g1h->do_collection_pause_at_safepoint(_target_pause_time_ms);
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
154 if (_pause_succeeded && _word_size > 0) {
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
155 // An allocation had been requested.
20404
227a9e5e4b4a 8057536: Refactor G1 to allow context specific allocations
sjohanss
parents: 20190
diff changeset
156 _result = g1h->attempt_allocation_at_safepoint(_word_size, allocation_context(),
1973
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
157 true /* expect_null_cur_alloc_region */);
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
158 } else {
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
159 assert(_result == NULL, "invariant");
5963
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
160 if (!_pause_succeeded) {
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
161 // Another possible reason reason for the pause to not be successful
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
162 // is that, again, the GC locker is active (and has become active
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
163 // since the prologue was executed). In this case we should retry
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
164 // the pause after waiting for the GC locker to become inactive.
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
165 _should_retry_gc = true;
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
166 }
1973
631f79e71e90 6974966: G1: unnecessary direct-to-old allocations
tonyp
parents: 1972
diff changeset
167 }
1656
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
168 }
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
169
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
170 void VM_G1IncCollectionPause::doit_epilogue() {
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
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diff changeset
171 VM_GC_Operation::doit_epilogue();
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
172
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
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diff changeset
173 // 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
174 // +ExplicitGCInvokesConcurrent, we have to wait here for the cycle
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
175 // that just started (or maybe one that was already in progress) to
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
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176 // finish.
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
177 if (_gc_cause == GCCause::_java_lang_system_gc &&
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
178 _should_initiate_conc_mark) {
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
179 assert(ExplicitGCInvokesConcurrent,
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
180 "the only way to be here is if ExplicitGCInvokesConcurrent is set");
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
181
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
182 G1CollectedHeap* g1h = G1CollectedHeap::heap();
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
183
6120
37552638d24a 7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents: 6062
diff changeset
184 // 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
parents: 6062
diff changeset
185 // 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
186 // wait until we observe that g1h->old_marking_cycles_completed()
1656
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tonyp
parents: 1552
diff changeset
187 // 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
diff changeset
188 // a cycle and it completes, b) a cycle already in progress
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
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189 // completes, or c) a Full GC happens.
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
190
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
191 // 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
diff changeset
192 // 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
193 if (g1h->old_marking_cycles_completed() <=
37552638d24a 7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents: 6062
diff changeset
194 _old_marking_cycles_completed_before) {
1656
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
195 // The following is largely copied from CMS
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 Thread* thr = Thread::current();
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
198 assert(thr->is_Java_thread(), "invariant");
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
199 JavaThread* jt = (JavaThread*)thr;
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
200 ThreadToNativeFromVM native(jt);
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 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
203 while (g1h->old_marking_cycles_completed() <=
37552638d24a 7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents: 6062
diff changeset
204 _old_marking_cycles_completed_before) {
1656
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
205 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag);
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
206 }
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
207 }
4e5661ba9d98 6944166: G1: explicit GCs are not always handled correctly
tonyp
parents: 1552
diff changeset
208 }
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
209 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
210
4022
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
211 void VM_CGC_Operation::acquire_pending_list_lock() {
5963
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
212 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
213 // 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
214 // 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
215 ConcurrentMarkThread::slt()->
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
216 manipulatePLL(SurrogateLockerThread::acquirePLL);
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
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
219 void VM_CGC_Operation::release_and_notify_pending_list_lock() {
5963
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
220 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
221 // 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
222 // 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
223 ConcurrentMarkThread::slt()->
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
224 manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL);
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
225 }
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
226
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
227 void VM_CGC_Operation::doit() {
6007
5c86f8211d1e 7160728: Introduce an extra logging level for G1 logging
brutisso
parents: 5963
diff changeset
228 gclog_or_tty->date_stamp(G1Log::fine() && PrintGCDateStamps);
5c86f8211d1e 7160728: Introduce an extra logging level for G1 logging
brutisso
parents: 5963
diff changeset
229 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
230 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
231 SharedHeap* sh = SharedHeap::heap();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
232 // 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
233 if (sh != NULL) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
234 IsGCActiveMark x;
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 } else {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
237 _cl->do_void();
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 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
240
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
241 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
242 // 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
243 // VM_GC_Operation::doit_prologue() or deadlocks can occur
5963
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
244 if (_needs_pll) {
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
245 acquire_pending_list_lock();
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
246 }
4022
db89aa49298f 7099824: G1: we should take the pending list lock before doing the remark pause
johnc
parents: 3914
diff changeset
247
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
248 Heap_lock->lock();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
249 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = true;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
250 return true;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
251 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
252
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
253 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
254 // 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
255 // VM_GC_Operation::doit_epilogue()
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
256 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = false;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
257 Heap_lock->unlock();
5963
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
258 if (_needs_pll) {
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
259 release_and_notify_pending_list_lock();
64bf7c8270cb 7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents: 4829
diff changeset
260 }
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
261 }