Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/vm_operations_g1.cpp @ 23472:047a642c9729
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 |
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date | Wed, 02 Dec 2015 13:58:34 +0530 |
parents | af8f16ac392c |
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rev | line source |
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342 | 1 /* |
22936 | 2 * Copyright (c) 2001, 2015, 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 |
22936 | 37 VM_G1CollectForAllocation::VM_G1CollectForAllocation(uint gc_count_before, |
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."); |
1973 | 42 } |
43 | |
342 | 44 void VM_G1CollectForAllocation::doit() { |
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); |
1973 | 49 assert(_result == NULL || _pause_succeeded, |
50 "if we get back a result, the pause should have succeeded"); | |
342 | 51 } |
52 | |
53 void VM_G1CollectFull::doit() { | |
54 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
55 GCCauseSetter x(g1h, _gc_cause); | |
56 g1h->do_full_collection(false /* clear_all_soft_refs */); | |
57 } | |
58 | |
22936 | 59 VM_G1IncCollectionPause::VM_G1IncCollectionPause(uint gc_count_before, |
60 size_t word_size, | |
61 bool should_initiate_conc_mark, | |
62 double target_pause_time_ms, | |
63 GCCause::Cause gc_cause) | |
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64 : VM_G1OperationWithAllocRequest(gc_count_before, word_size, gc_cause), |
1973 | 65 _should_initiate_conc_mark(should_initiate_conc_mark), |
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) { |
1973 | 69 guarantee(target_pause_time_ms > 0.0, |
70 err_msg("target_pause_time_ms = %1.6lf should be positive", | |
71 target_pause_time_ms)); | |
72 _gc_cause = gc_cause; | |
73 } | |
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 |
342 | 91 void VM_G1IncCollectionPause::doit() { |
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 |
1973 | 96 if (_word_size > 0) { |
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(), |
1973 | 99 false /* expect_null_cur_alloc_region */); |
100 if (_result != NULL) { | |
101 // If we can successfully allocate before we actually do the | |
102 // pause then we will consider this pause successful. | |
103 _pause_succeeded = true; | |
104 return; | |
105 } | |
106 } | |
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; |
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142 } |
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143 return; |
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144 } |
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145 } |
1973 | 146 |
147 _pause_succeeded = | |
148 g1h->do_collection_pause_at_safepoint(_target_pause_time_ms); | |
149 if (_pause_succeeded && _word_size > 0) { | |
150 // An allocation had been requested. | |
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151 _result = g1h->attempt_allocation_at_safepoint(_word_size, allocation_context(), |
1973 | 152 true /* expect_null_cur_alloc_region */); |
153 } else { | |
154 assert(_result == NULL, "invariant"); | |
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155 if (!_pause_succeeded) { |
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156 // Another possible reason reason for the pause to not be successful |
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157 // is that, again, the GC locker is active (and has become active |
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158 // since the prologue was executed). In this case we should retry |
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159 // the pause after waiting for the GC locker to become inactive. |
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160 _should_retry_gc = true; |
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161 } |
1973 | 162 } |
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163 } |
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164 |
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165 void VM_G1IncCollectionPause::doit_epilogue() { |
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166 VM_G1OperationWithAllocRequest::doit_epilogue(); |
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167 |
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168 // If the pause was initiated by a System.gc() and |
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169 // +ExplicitGCInvokesConcurrent, we have to wait here for the cycle |
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170 // that just started (or maybe one that was already in progress) to |
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171 // finish. |
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172 if (_gc_cause == GCCause::_java_lang_system_gc && |
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173 _should_initiate_conc_mark) { |
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174 assert(ExplicitGCInvokesConcurrent, |
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175 "the only way to be here is if ExplicitGCInvokesConcurrent is set"); |
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176 |
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177 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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178 |
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179 // In the doit() method we saved g1h->old_marking_cycles_completed() |
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180 // in the _old_marking_cycles_completed_before field. We have to |
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181 // wait until we observe that g1h->old_marking_cycles_completed() |
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182 // has increased by at least one. This can happen if a) we started |
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183 // a cycle and it completes, b) a cycle already in progress |
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184 // completes, or c) a Full GC happens. |
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185 |
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186 // If the condition has already been reached, there's no point in |
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187 // actually taking the lock and doing the wait. |
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188 if (g1h->old_marking_cycles_completed() <= |
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189 _old_marking_cycles_completed_before) { |
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190 // The following is largely copied from CMS |
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191 |
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192 Thread* thr = Thread::current(); |
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193 assert(thr->is_Java_thread(), "invariant"); |
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194 JavaThread* jt = (JavaThread*)thr; |
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195 ThreadToNativeFromVM native(jt); |
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196 |
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197 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
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198 while (g1h->old_marking_cycles_completed() <= |
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199 _old_marking_cycles_completed_before) { |
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200 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag); |
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201 } |
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202 } |
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203 } |
342 | 204 } |
205 | |
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206 void VM_CGC_Operation::acquire_pending_list_lock() { |
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207 assert(_needs_pll, "don't call this otherwise"); |
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208 // The caller may block while communicating |
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209 // with the SLT thread in order to acquire/release the PLL. |
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210 SurrogateLockerThread* slt = ConcurrentMarkThread::slt(); |
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211 if (slt != NULL) { |
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212 slt->manipulatePLL(SurrogateLockerThread::acquirePLL); |
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213 } else { |
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214 SurrogateLockerThread::report_missing_slt(); |
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215 } |
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216 } |
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217 |
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218 void VM_CGC_Operation::release_and_notify_pending_list_lock() { |
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219 assert(_needs_pll, "don't call this otherwise"); |
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220 // The caller may block while communicating |
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221 // with the SLT thread in order to acquire/release the PLL. |
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222 ConcurrentMarkThread::slt()-> |
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223 manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL); |
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224 } |
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225 |
342 | 226 void VM_CGC_Operation::doit() { |
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227 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
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228 GCTraceTime t(_printGCMessage, G1Log::fine(), true, G1CollectedHeap::heap()->gc_timer_cm(), G1CollectedHeap::heap()->concurrent_mark()->concurrent_gc_id()); |
342 | 229 SharedHeap* sh = SharedHeap::heap(); |
230 // This could go away if CollectedHeap gave access to _gc_is_active... | |
231 if (sh != NULL) { | |
232 IsGCActiveMark x; | |
233 _cl->do_void(); | |
234 } else { | |
235 _cl->do_void(); | |
236 } | |
237 } | |
238 | |
239 bool VM_CGC_Operation::doit_prologue() { | |
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240 // Note the relative order of the locks must match that in |
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241 // VM_GC_Operation::doit_prologue() or deadlocks can occur |
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242 if (_needs_pll) { |
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243 acquire_pending_list_lock(); |
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244 } |
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245 |
342 | 246 Heap_lock->lock(); |
247 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = true; | |
248 return true; | |
249 } | |
250 | |
251 void VM_CGC_Operation::doit_epilogue() { | |
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252 // Note the relative order of the unlocks must match that in |
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253 // VM_GC_Operation::doit_epilogue() |
342 | 254 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = false; |
255 Heap_lock->unlock(); | |
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256 if (_needs_pll) { |
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257 release_and_notify_pending_list_lock(); |
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258 } |
342 | 259 } |