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annotate src/share/vm/gc_implementation/g1/vm_operations_g1.cpp @ 4829:9509c20bba28

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6976060: G1: humongous object allocations should initiate marking cycles when necessary Reviewed-by: tonyp, johnc
author brutisso
date Mon, 16 Jan 2012 22:10:05 +0100
parents db89aa49298f
children 64bf7c8270cb
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1 /*
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2 * Copyright (c) 2001, 2012, 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/vm_operations_g1.hpp"
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30 #include "gc_implementation/shared/isGCActiveMark.hpp"
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31 #include "gc_implementation/g1/vm_operations_g1.hpp"
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32 #include "runtime/interfaceSupport.hpp"
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33
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34 VM_G1CollectForAllocation::VM_G1CollectForAllocation(
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35 unsigned int gc_count_before,
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36 size_t word_size)
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37 : VM_G1OperationWithAllocRequest(gc_count_before, word_size) {
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38 guarantee(word_size > 0, "an allocation should always be requested");
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39 }
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40
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41 void VM_G1CollectForAllocation::doit() {
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42 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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43 _result = g1h->satisfy_failed_allocation(_word_size, &_pause_succeeded);
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44 assert(_result == NULL || _pause_succeeded,
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45 "if we get back a result, the pause should have succeeded");
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46 }
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47
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48 void VM_G1CollectFull::doit() {
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49 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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50 GCCauseSetter x(g1h, _gc_cause);
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51 g1h->do_full_collection(false /* clear_all_soft_refs */);
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52 }
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53
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54 VM_G1IncCollectionPause::VM_G1IncCollectionPause(
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55 unsigned int gc_count_before,
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56 size_t word_size,
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57 bool should_initiate_conc_mark,
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58 double target_pause_time_ms,
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59 GCCause::Cause gc_cause)
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60 : VM_G1OperationWithAllocRequest(gc_count_before, word_size),
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61 _should_initiate_conc_mark(should_initiate_conc_mark),
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62 _target_pause_time_ms(target_pause_time_ms),
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63 _full_collections_completed_before(0) {
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64 guarantee(target_pause_time_ms > 0.0,
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65 err_msg("target_pause_time_ms = %1.6lf should be positive",
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66 target_pause_time_ms));
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67 guarantee(word_size == 0 || gc_cause == GCCause::_g1_inc_collection_pause,
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68 "we can only request an allocation if the GC cause is for "
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69 "an incremental GC pause");
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70 _gc_cause = gc_cause;
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71 }
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72
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73 void VM_G1IncCollectionPause::doit() {
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74 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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75 assert(!_should_initiate_conc_mark ||
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76 ((_gc_cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) ||
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77 (_gc_cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent) ||
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78 _gc_cause == GCCause::_g1_humongous_allocation),
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79 "only a GC locker, a System.gc() or a hum allocation induced GC should start a cycle");
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80
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81 if (_word_size > 0) {
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82 // An allocation has been requested. So, try to do that first.
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83 _result = g1h->attempt_allocation_at_safepoint(_word_size,
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84 false /* expect_null_cur_alloc_region */);
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85 if (_result != NULL) {
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86 // If we can successfully allocate before we actually do the
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87 // pause then we will consider this pause successful.
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88 _pause_succeeded = true;
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89 return;
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90 }
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91 }
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92
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93 GCCauseSetter x(g1h, _gc_cause);
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94 if (_should_initiate_conc_mark) {
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95 // It's safer to read full_collections_completed() here, given
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96 // that noone else will be updating it concurrently. Since we'll
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97 // only need it if we're initiating a marking cycle, no point in
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98 // setting it earlier.
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99 _full_collections_completed_before = g1h->full_collections_completed();
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100
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101 // At this point we are supposed to start a concurrent cycle. We
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102 // will do so if one is not already in progress.
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103 bool res = g1h->g1_policy()->force_initial_mark_if_outside_cycle(_gc_cause);
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104
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105 // The above routine returns true if we were able to force the
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106 // next GC pause to be an initial mark; it returns false if a
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107 // marking cycle is already in progress.
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108 //
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109 // If a marking cycle is already in progress just return and skip
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110 // the pause - the requesting thread should block in doit_epilogue
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111 // until the marking cycle is complete.
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112 if (!res) {
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113 assert(_word_size == 0, "ExplicitGCInvokesConcurrent shouldn't be allocating");
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114 return;
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115 }
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116 }
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117
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118 _pause_succeeded =
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119 g1h->do_collection_pause_at_safepoint(_target_pause_time_ms);
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120 if (_pause_succeeded && _word_size > 0) {
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121 // An allocation had been requested.
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122 _result = g1h->attempt_allocation_at_safepoint(_word_size,
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123 true /* expect_null_cur_alloc_region */);
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124 } else {
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125 assert(_result == NULL, "invariant");
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126 }
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127 }
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128
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129 void VM_G1IncCollectionPause::doit_epilogue() {
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130 VM_GC_Operation::doit_epilogue();
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131
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132 // If the pause was initiated by a System.gc() and
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133 // +ExplicitGCInvokesConcurrent, we have to wait here for the cycle
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134 // that just started (or maybe one that was already in progress) to
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135 // finish.
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136 if (_gc_cause == GCCause::_java_lang_system_gc &&
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137 _should_initiate_conc_mark) {
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138 assert(ExplicitGCInvokesConcurrent,
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139 "the only way to be here is if ExplicitGCInvokesConcurrent is set");
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140
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141 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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142
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143 // In the doit() method we saved g1h->full_collections_completed()
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144 // in the _full_collections_completed_before field. We have to
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145 // wait until we observe that g1h->full_collections_completed()
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146 // has increased by at least one. This can happen if a) we started
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147 // a cycle and it completes, b) a cycle already in progress
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148 // completes, or c) a Full GC happens.
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149
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150 // If the condition has already been reached, there's no point in
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151 // actually taking the lock and doing the wait.
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152 if (g1h->full_collections_completed() <=
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153 _full_collections_completed_before) {
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154 // The following is largely copied from CMS
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155
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156 Thread* thr = Thread::current();
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157 assert(thr->is_Java_thread(), "invariant");
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158 JavaThread* jt = (JavaThread*)thr;
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159 ThreadToNativeFromVM native(jt);
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160
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161 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag);
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162 while (g1h->full_collections_completed() <=
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163 _full_collections_completed_before) {
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164 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag);
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165 }
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166 }
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167 }
342
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168 }
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169
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170 void VM_CGC_Operation::acquire_pending_list_lock() {
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171 // The caller may block while communicating
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172 // with the SLT thread in order to acquire/release the PLL.
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173 ConcurrentMarkThread::slt()->
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174 manipulatePLL(SurrogateLockerThread::acquirePLL);
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175 }
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176
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177 void VM_CGC_Operation::release_and_notify_pending_list_lock() {
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178 // The caller may block while communicating
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179 // with the SLT thread in order to acquire/release the PLL.
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180 ConcurrentMarkThread::slt()->
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181 manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL);
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182 }
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183
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184 void VM_CGC_Operation::doit() {
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185 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps);
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186 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty);
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187 TraceTime t(_printGCMessage, PrintGC, true, gclog_or_tty);
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188 SharedHeap* sh = SharedHeap::heap();
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189 // This could go away if CollectedHeap gave access to _gc_is_active...
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190 if (sh != NULL) {
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191 IsGCActiveMark x;
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192 _cl->do_void();
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193 } else {
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194 _cl->do_void();
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195 }
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196 }
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197
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198 bool VM_CGC_Operation::doit_prologue() {
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199 // Note the relative order of the locks must match that in
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200 // VM_GC_Operation::doit_prologue() or deadlocks can occur
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201 acquire_pending_list_lock();
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202
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203 Heap_lock->lock();
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204 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = true;
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205 return true;
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206 }
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207
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208 void VM_CGC_Operation::doit_epilogue() {
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209 // Note the relative order of the unlocks must match that in
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210 // VM_GC_Operation::doit_epilogue()
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211 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = false;
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212 Heap_lock->unlock();
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213 release_and_notify_pending_list_lock();
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214 }