Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/vm_operations_g1.cpp @ 20619:b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
Reviewed-by: mgerdin, coleenp, bdelsart
author | stefank |
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date | Thu, 02 Oct 2014 10:55:36 +0200 |
parents | d3fd73295885 |
children | 4e4ebe50c8e3 |
rev | line source |
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342 | 1 /* |
10405 | 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
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26 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
1972 | 27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
28 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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29 #include "gc_implementation/g1/g1Log.hpp" |
1972 | 30 #include "gc_implementation/g1/vm_operations_g1.hpp" |
10405 | 31 #include "gc_implementation/shared/gcTimer.hpp" |
32 #include "gc_implementation/shared/gcTraceTime.hpp" | |
1972 | 33 #include "gc_implementation/shared/isGCActiveMark.hpp" |
1973 | 34 #include "gc_implementation/g1/vm_operations_g1.hpp" |
1972 | 35 #include "runtime/interfaceSupport.hpp" |
342 | 36 |
1973 | 37 VM_G1CollectForAllocation::VM_G1CollectForAllocation( |
38 unsigned int gc_count_before, | |
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) { |
1973 | 42 guarantee(word_size > 0, "an allocation should always be requested"); |
43 } | |
44 | |
342 | 45 void VM_G1CollectForAllocation::doit() { |
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); |
1973 | 50 assert(_result == NULL || _pause_succeeded, |
51 "if we get back a result, the pause should have succeeded"); | |
342 | 52 } |
53 | |
54 void VM_G1CollectFull::doit() { | |
55 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
56 GCCauseSetter x(g1h, _gc_cause); | |
57 g1h->do_full_collection(false /* clear_all_soft_refs */); | |
58 } | |
59 | |
1973 | 60 VM_G1IncCollectionPause::VM_G1IncCollectionPause( |
61 unsigned int gc_count_before, | |
62 size_t word_size, | |
63 bool should_initiate_conc_mark, | |
64 double target_pause_time_ms, | |
65 GCCause::Cause gc_cause) | |
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66 : VM_G1OperationWithAllocRequest(gc_count_before, word_size, gc_cause), |
1973 | 67 _should_initiate_conc_mark(should_initiate_conc_mark), |
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) { |
1973 | 71 guarantee(target_pause_time_ms > 0.0, |
72 err_msg("target_pause_time_ms = %1.6lf should be positive", | |
73 target_pause_time_ms)); | |
74 _gc_cause = gc_cause; | |
75 } | |
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 |
342 | 93 void VM_G1IncCollectionPause::doit() { |
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 _gc_cause == GCCause::_update_allocation_context_stats_inc), |
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100 "only a GC locker, a System.gc(), stats update or a hum allocation induced GC should start a cycle"); |
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101 |
1973 | 102 if (_word_size > 0) { |
103 // An allocation has been requested. So, try to do that first. | |
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104 _result = g1h->attempt_allocation_at_safepoint(_word_size, allocation_context(), |
1973 | 105 false /* expect_null_cur_alloc_region */); |
106 if (_result != NULL) { | |
107 // If we can successfully allocate before we actually do the | |
108 // pause then we will consider this pause successful. | |
109 _pause_succeeded = true; | |
110 return; | |
111 } | |
112 } | |
113 | |
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114 GCCauseSetter x(g1h, _gc_cause); |
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115 if (_should_initiate_conc_mark) { |
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116 // It's safer to read old_marking_cycles_completed() here, given |
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117 // that noone else will be updating it concurrently. Since we'll |
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118 // only need it if we're initiating a marking cycle, no point in |
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119 // setting it earlier. |
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120 _old_marking_cycles_completed_before = g1h->old_marking_cycles_completed(); |
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121 |
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122 // At this point we are supposed to start a concurrent cycle. We |
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123 // will do so if one is not already in progress. |
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124 bool res = g1h->g1_policy()->force_initial_mark_if_outside_cycle(_gc_cause); |
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125 |
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126 // The above routine returns true if we were able to force the |
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127 // next GC pause to be an initial mark; it returns false if a |
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128 // marking cycle is already in progress. |
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129 // |
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130 // If a marking cycle is already in progress just return and skip the |
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131 // pause below - if the reason for requesting this initial mark pause |
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132 // was due to a System.gc() then the requesting thread should block in |
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133 // doit_epilogue() until the marking cycle is complete. |
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134 // |
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135 // If this initial mark pause was requested as part of a humongous |
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136 // allocation then we know that the marking cycle must just have |
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137 // been started by another thread (possibly also allocating a humongous |
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138 // object) as there was no active marking cycle when the requesting |
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139 // thread checked before calling collect() in |
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140 // attempt_allocation_humongous(). Retrying the GC, in this case, |
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141 // will cause the requesting thread to spin inside collect() until the |
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142 // just started marking cycle is complete - which may be a while. So |
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143 // we do NOT retry the GC. |
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144 if (!res) { |
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145 assert(_word_size == 0, "Concurrent Full GC/Humongous Object IM shouldn't be allocating"); |
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146 if (_gc_cause != GCCause::_g1_humongous_allocation) { |
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147 _should_retry_gc = true; |
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148 } |
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149 return; |
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150 } |
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151 } |
1973 | 152 |
153 _pause_succeeded = | |
154 g1h->do_collection_pause_at_safepoint(_target_pause_time_ms); | |
155 if (_pause_succeeded && _word_size > 0) { | |
156 // An allocation had been requested. | |
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157 _result = g1h->attempt_allocation_at_safepoint(_word_size, allocation_context(), |
1973 | 158 true /* expect_null_cur_alloc_region */); |
159 } else { | |
160 assert(_result == NULL, "invariant"); | |
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161 if (!_pause_succeeded) { |
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162 // Another possible reason reason for the pause to not be successful |
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163 // is that, again, the GC locker is active (and has become active |
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164 // since the prologue was executed). In this case we should retry |
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165 // the pause after waiting for the GC locker to become inactive. |
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166 _should_retry_gc = true; |
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167 } |
1973 | 168 } |
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169 } |
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170 |
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171 void VM_G1IncCollectionPause::doit_epilogue() { |
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172 VM_GC_Operation::doit_epilogue(); |
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173 |
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174 // If the pause was initiated by a System.gc() and |
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175 // +ExplicitGCInvokesConcurrent, we have to wait here for the cycle |
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176 // that just started (or maybe one that was already in progress) to |
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177 // finish. |
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178 if (_gc_cause == GCCause::_java_lang_system_gc && |
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179 _should_initiate_conc_mark) { |
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180 assert(ExplicitGCInvokesConcurrent, |
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181 "the only way to be here is if ExplicitGCInvokesConcurrent is set"); |
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182 |
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183 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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184 |
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185 // In the doit() method we saved g1h->old_marking_cycles_completed() |
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186 // in the _old_marking_cycles_completed_before field. We have to |
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187 // wait until we observe that g1h->old_marking_cycles_completed() |
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188 // has increased by at least one. This can happen if a) we started |
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189 // a cycle and it completes, b) a cycle already in progress |
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190 // completes, or c) a Full GC happens. |
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191 |
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192 // If the condition has already been reached, there's no point in |
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193 // actually taking the lock and doing the wait. |
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194 if (g1h->old_marking_cycles_completed() <= |
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195 _old_marking_cycles_completed_before) { |
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196 // The following is largely copied from CMS |
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197 |
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198 Thread* thr = Thread::current(); |
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199 assert(thr->is_Java_thread(), "invariant"); |
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200 JavaThread* jt = (JavaThread*)thr; |
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201 ThreadToNativeFromVM native(jt); |
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202 |
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203 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
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204 while (g1h->old_marking_cycles_completed() <= |
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205 _old_marking_cycles_completed_before) { |
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206 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag); |
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207 } |
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208 } |
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209 } |
342 | 210 } |
211 | |
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212 void VM_CGC_Operation::acquire_pending_list_lock() { |
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213 assert(_needs_pll, "don't call this otherwise"); |
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214 // The caller may block while communicating |
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215 // with the SLT thread in order to acquire/release the PLL. |
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216 ConcurrentMarkThread::slt()-> |
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217 manipulatePLL(SurrogateLockerThread::acquirePLL); |
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218 } |
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219 |
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220 void VM_CGC_Operation::release_and_notify_pending_list_lock() { |
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221 assert(_needs_pll, "don't call this otherwise"); |
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222 // The caller may block while communicating |
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223 // with the SLT thread in order to acquire/release the PLL. |
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224 ConcurrentMarkThread::slt()-> |
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225 manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL); |
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226 } |
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227 |
342 | 228 void VM_CGC_Operation::doit() { |
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229 gclog_or_tty->date_stamp(G1Log::fine() && PrintGCDateStamps); |
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230 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
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231 GCTraceTime t(_printGCMessage, G1Log::fine(), true, G1CollectedHeap::heap()->gc_timer_cm(), G1CollectedHeap::heap()->concurrent_mark()->concurrent_gc_id()); |
342 | 232 SharedHeap* sh = SharedHeap::heap(); |
233 // This could go away if CollectedHeap gave access to _gc_is_active... | |
234 if (sh != NULL) { | |
235 IsGCActiveMark x; | |
236 _cl->do_void(); | |
237 } else { | |
238 _cl->do_void(); | |
239 } | |
240 } | |
241 | |
242 bool VM_CGC_Operation::doit_prologue() { | |
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243 // Note the relative order of the locks must match that in |
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244 // VM_GC_Operation::doit_prologue() or deadlocks can occur |
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245 if (_needs_pll) { |
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246 acquire_pending_list_lock(); |
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247 } |
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248 |
342 | 249 Heap_lock->lock(); |
250 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = true; | |
251 return true; | |
252 } | |
253 | |
254 void VM_CGC_Operation::doit_epilogue() { | |
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255 // Note the relative order of the unlocks must match that in |
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256 // VM_GC_Operation::doit_epilogue() |
342 | 257 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = false; |
258 Heap_lock->unlock(); | |
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259 if (_needs_pll) { |
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260 release_and_notify_pending_list_lock(); |
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261 } |
342 | 262 } |