Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/vm_operations_g1.cpp @ 19083:09292c24d555
LSStackSlotAllocator: hide inner class.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Sat, 31 Jan 2015 11:07:15 +0100 |
parents | f7d3b4387a16 |
children | 0982ec23da03 |
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); |
1973 | 48 _result = g1h->satisfy_failed_allocation(_word_size, &_pause_succeeded); |
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 | |
1973 | 59 VM_G1IncCollectionPause::VM_G1IncCollectionPause( |
60 unsigned int gc_count_before, | |
61 size_t word_size, | |
62 bool should_initiate_conc_mark, | |
63 double target_pause_time_ms, | |
64 GCCause::Cause gc_cause) | |
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65 : VM_G1OperationWithAllocRequest(gc_count_before, word_size, gc_cause), |
1973 | 66 _should_initiate_conc_mark(should_initiate_conc_mark), |
67 _target_pause_time_ms(target_pause_time_ms), | |
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68 _should_retry_gc(false), |
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69 _old_marking_cycles_completed_before(0) { |
1973 | 70 guarantee(target_pause_time_ms > 0.0, |
71 err_msg("target_pause_time_ms = %1.6lf should be positive", | |
72 target_pause_time_ms)); | |
73 _gc_cause = gc_cause; | |
74 } | |
75 | |
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76 bool VM_G1IncCollectionPause::doit_prologue() { |
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77 bool res = VM_GC_Operation::doit_prologue(); |
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78 if (!res) { |
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79 if (_should_initiate_conc_mark) { |
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80 // The prologue can fail for a couple of reasons. The first is that another GC |
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81 // got scheduled and prevented the scheduling of the initial mark GC. The |
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82 // second is that the GC locker may be active and the heap can't be expanded. |
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83 // In both cases we want to retry the GC so that the initial mark pause is |
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84 // actually scheduled. In the second case, however, we should stall until |
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85 // until the GC locker is no longer active and then retry the initial mark GC. |
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86 _should_retry_gc = true; |
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87 } |
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88 } |
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89 return res; |
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90 } |
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91 |
342 | 92 void VM_G1IncCollectionPause::doit() { |
93 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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94 assert(!_should_initiate_conc_mark || |
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95 ((_gc_cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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96 (_gc_cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent) || |
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97 _gc_cause == GCCause::_g1_humongous_allocation), |
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98 "only a GC locker, a System.gc() or a hum allocation induced GC should start a cycle"); |
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99 |
1973 | 100 if (_word_size > 0) { |
101 // An allocation has been requested. So, try to do that first. | |
102 _result = g1h->attempt_allocation_at_safepoint(_word_size, | |
103 false /* expect_null_cur_alloc_region */); | |
104 if (_result != NULL) { | |
105 // If we can successfully allocate before we actually do the | |
106 // pause then we will consider this pause successful. | |
107 _pause_succeeded = true; | |
108 return; | |
109 } | |
110 } | |
111 | |
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112 GCCauseSetter x(g1h, _gc_cause); |
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113 if (_should_initiate_conc_mark) { |
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114 // It's safer to read old_marking_cycles_completed() here, given |
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115 // that noone else will be updating it concurrently. Since we'll |
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116 // only need it if we're initiating a marking cycle, no point in |
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117 // setting it earlier. |
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118 _old_marking_cycles_completed_before = g1h->old_marking_cycles_completed(); |
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119 |
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120 // At this point we are supposed to start a concurrent cycle. We |
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121 // will do so if one is not already in progress. |
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122 bool res = g1h->g1_policy()->force_initial_mark_if_outside_cycle(_gc_cause); |
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123 |
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124 // The above routine returns true if we were able to force the |
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125 // next GC pause to be an initial mark; it returns false if a |
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126 // marking cycle is already in progress. |
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127 // |
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128 // If a marking cycle is already in progress just return and skip the |
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129 // pause below - if the reason for requesting this initial mark pause |
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130 // was due to a System.gc() then the requesting thread should block in |
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131 // doit_epilogue() until the marking cycle is complete. |
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132 // |
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133 // If this initial mark pause was requested as part of a humongous |
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134 // allocation then we know that the marking cycle must just have |
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135 // been started by another thread (possibly also allocating a humongous |
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136 // object) as there was no active marking cycle when the requesting |
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137 // thread checked before calling collect() in |
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138 // attempt_allocation_humongous(). Retrying the GC, in this case, |
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139 // will cause the requesting thread to spin inside collect() until the |
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140 // just started marking cycle is complete - which may be a while. So |
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141 // we do NOT retry the GC. |
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142 if (!res) { |
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143 assert(_word_size == 0, "Concurrent Full GC/Humongous Object IM shouldn't be allocating"); |
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144 if (_gc_cause != GCCause::_g1_humongous_allocation) { |
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145 _should_retry_gc = true; |
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146 } |
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147 return; |
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148 } |
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149 } |
1973 | 150 |
151 _pause_succeeded = | |
152 g1h->do_collection_pause_at_safepoint(_target_pause_time_ms); | |
153 if (_pause_succeeded && _word_size > 0) { | |
154 // An allocation had been requested. | |
155 _result = g1h->attempt_allocation_at_safepoint(_word_size, | |
156 true /* expect_null_cur_alloc_region */); | |
157 } else { | |
158 assert(_result == NULL, "invariant"); | |
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159 if (!_pause_succeeded) { |
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160 // Another possible reason reason for the pause to not be successful |
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161 // is that, again, the GC locker is active (and has become active |
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162 // since the prologue was executed). In this case we should retry |
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163 // the pause after waiting for the GC locker to become inactive. |
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164 _should_retry_gc = true; |
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165 } |
1973 | 166 } |
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167 } |
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168 |
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169 void VM_G1IncCollectionPause::doit_epilogue() { |
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170 VM_GC_Operation::doit_epilogue(); |
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171 |
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172 // If the pause was initiated by a System.gc() and |
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173 // +ExplicitGCInvokesConcurrent, we have to wait here for the cycle |
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174 // that just started (or maybe one that was already in progress) to |
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175 // finish. |
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176 if (_gc_cause == GCCause::_java_lang_system_gc && |
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177 _should_initiate_conc_mark) { |
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178 assert(ExplicitGCInvokesConcurrent, |
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179 "the only way to be here is if ExplicitGCInvokesConcurrent is set"); |
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180 |
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181 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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182 |
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183 // In the doit() method we saved g1h->old_marking_cycles_completed() |
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184 // in the _old_marking_cycles_completed_before field. We have to |
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185 // wait until we observe that g1h->old_marking_cycles_completed() |
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186 // has increased by at least one. This can happen if a) we started |
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187 // a cycle and it completes, b) a cycle already in progress |
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188 // completes, or c) a Full GC happens. |
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189 |
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190 // If the condition has already been reached, there's no point in |
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191 // actually taking the lock and doing the wait. |
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192 if (g1h->old_marking_cycles_completed() <= |
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193 _old_marking_cycles_completed_before) { |
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194 // The following is largely copied from CMS |
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195 |
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196 Thread* thr = Thread::current(); |
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197 assert(thr->is_Java_thread(), "invariant"); |
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198 JavaThread* jt = (JavaThread*)thr; |
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199 ThreadToNativeFromVM native(jt); |
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200 |
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201 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
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202 while (g1h->old_marking_cycles_completed() <= |
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203 _old_marking_cycles_completed_before) { |
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204 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag); |
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205 } |
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206 } |
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207 } |
342 | 208 } |
209 | |
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210 void VM_CGC_Operation::acquire_pending_list_lock() { |
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211 assert(_needs_pll, "don't call this otherwise"); |
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212 // The caller may block while communicating |
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213 // with the SLT thread in order to acquire/release the PLL. |
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214 ConcurrentMarkThread::slt()-> |
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215 manipulatePLL(SurrogateLockerThread::acquirePLL); |
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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 gclog_or_tty->date_stamp(G1Log::fine() && PrintGCDateStamps); |
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228 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
10405 | 229 GCTraceTime t(_printGCMessage, G1Log::fine(), true, G1CollectedHeap::heap()->gc_timer_cm()); |
342 | 230 SharedHeap* sh = SharedHeap::heap(); |
231 // This could go away if CollectedHeap gave access to _gc_is_active... | |
232 if (sh != NULL) { | |
233 IsGCActiveMark x; | |
234 _cl->do_void(); | |
235 } else { | |
236 _cl->do_void(); | |
237 } | |
238 } | |
239 | |
240 bool VM_CGC_Operation::doit_prologue() { | |
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241 // Note the relative order of the locks must match that in |
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242 // VM_GC_Operation::doit_prologue() or deadlocks can occur |
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243 if (_needs_pll) { |
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244 acquire_pending_list_lock(); |
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245 } |
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246 |
342 | 247 Heap_lock->lock(); |
248 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = true; | |
249 return true; | |
250 } | |
251 | |
252 void VM_CGC_Operation::doit_epilogue() { | |
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253 // Note the relative order of the unlocks must match that in |
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254 // VM_GC_Operation::doit_epilogue() |
342 | 255 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = false; |
256 Heap_lock->unlock(); | |
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257 if (_needs_pll) { |
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258 release_and_notify_pending_list_lock(); |
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259 } |
342 | 260 } |