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annotate src/share/vm/gc_implementation/g1/vm_operations_g1.cpp @ 2431:02f49b66361a

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7026932: G1: No need to abort VM when card count cache expansion fails Summary: Manage allocation/freeing of the card cache counts and epochs arrays directly so that an allocation failure while attempting to expand these arrays does not abort the JVM. Failure to expand these arrays is not fatal. Reviewed-by: iveresov, tonyp
author johnc
date Mon, 28 Mar 2011 10:58:54 -0700
parents 7246a374a9f2
children 1d1603768966
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2001, 2010, 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/g1CollectedHeap.inline.hpp"
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27 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
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28 #include "gc_implementation/g1/vm_operations_g1.hpp"
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29 #include "gc_implementation/shared/isGCActiveMark.hpp"
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30 #include "gc_implementation/g1/vm_operations_g1.hpp"
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31 #include "runtime/interfaceSupport.hpp"
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32
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33 VM_G1CollectForAllocation::VM_G1CollectForAllocation(
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34 unsigned int gc_count_before,
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35 size_t word_size)
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36 : VM_G1OperationWithAllocRequest(gc_count_before, word_size) {
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37 guarantee(word_size > 0, "an allocation should always be requested");
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38 }
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39
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40 void VM_G1CollectForAllocation::doit() {
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41 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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42 _result = g1h->satisfy_failed_allocation(_word_size, &_pause_succeeded);
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43 assert(_result == NULL || _pause_succeeded,
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44 "if we get back a result, the pause should have succeeded");
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45 }
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46
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47 void VM_G1CollectFull::doit() {
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48 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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49 GCCauseSetter x(g1h, _gc_cause);
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50 g1h->do_full_collection(false /* clear_all_soft_refs */);
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51 }
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52
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53 VM_G1IncCollectionPause::VM_G1IncCollectionPause(
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54 unsigned int gc_count_before,
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55 size_t word_size,
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56 bool should_initiate_conc_mark,
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57 double target_pause_time_ms,
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58 GCCause::Cause gc_cause)
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59 : VM_G1OperationWithAllocRequest(gc_count_before, word_size),
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60 _should_initiate_conc_mark(should_initiate_conc_mark),
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61 _target_pause_time_ms(target_pause_time_ms),
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62 _full_collections_completed_before(0) {
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63 guarantee(target_pause_time_ms > 0.0,
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64 err_msg("target_pause_time_ms = %1.6lf should be positive",
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65 target_pause_time_ms));
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66 guarantee(word_size == 0 || gc_cause == GCCause::_g1_inc_collection_pause,
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67 "we can only request an allocation if the GC cause is for "
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68 "an incremental GC pause");
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69 _gc_cause = gc_cause;
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70 }
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71
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72 void VM_G1IncCollectionPause::doit() {
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73 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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74 assert(!_should_initiate_conc_mark ||
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75 ((_gc_cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) ||
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76 (_gc_cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)),
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77 "only a GC locker or a System.gc() induced GC should start a cycle");
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78
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79 if (_word_size > 0) {
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80 // An allocation has been requested. So, try to do that first.
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81 _result = g1h->attempt_allocation_at_safepoint(_word_size,
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82 false /* expect_null_cur_alloc_region */);
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83 if (_result != NULL) {
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84 // If we can successfully allocate before we actually do the
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85 // pause then we will consider this pause successful.
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86 _pause_succeeded = true;
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87 return;
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88 }
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89 }
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90
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91 GCCauseSetter x(g1h, _gc_cause);
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92 if (_should_initiate_conc_mark) {
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93 // It's safer to read full_collections_completed() here, given
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94 // that noone else will be updating it concurrently. Since we'll
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95 // only need it if we're initiating a marking cycle, no point in
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96 // setting it earlier.
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97 _full_collections_completed_before = g1h->full_collections_completed();
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98
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99 // At this point we are supposed to start a concurrent cycle. We
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100 // will do so if one is not already in progress.
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101 bool res = g1h->g1_policy()->force_initial_mark_if_outside_cycle();
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102 }
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103
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104 _pause_succeeded =
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105 g1h->do_collection_pause_at_safepoint(_target_pause_time_ms);
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106 if (_pause_succeeded && _word_size > 0) {
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107 // An allocation had been requested.
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108 _result = g1h->attempt_allocation_at_safepoint(_word_size,
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109 true /* expect_null_cur_alloc_region */);
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110 } else {
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111 assert(_result == NULL, "invariant");
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112 }
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113 }
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114
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115 void VM_G1IncCollectionPause::doit_epilogue() {
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116 VM_GC_Operation::doit_epilogue();
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117
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118 // If the pause was initiated by a System.gc() and
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119 // +ExplicitGCInvokesConcurrent, we have to wait here for the cycle
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120 // that just started (or maybe one that was already in progress) to
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121 // finish.
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122 if (_gc_cause == GCCause::_java_lang_system_gc &&
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123 _should_initiate_conc_mark) {
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124 assert(ExplicitGCInvokesConcurrent,
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125 "the only way to be here is if ExplicitGCInvokesConcurrent is set");
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126
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127 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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128
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129 // In the doit() method we saved g1h->full_collections_completed()
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130 // in the _full_collections_completed_before field. We have to
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131 // wait until we observe that g1h->full_collections_completed()
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132 // has increased by at least one. This can happen if a) we started
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133 // a cycle and it completes, b) a cycle already in progress
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134 // completes, or c) a Full GC happens.
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135
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136 // If the condition has already been reached, there's no point in
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137 // actually taking the lock and doing the wait.
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138 if (g1h->full_collections_completed() <=
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139 _full_collections_completed_before) {
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140 // The following is largely copied from CMS
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141
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142 Thread* thr = Thread::current();
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143 assert(thr->is_Java_thread(), "invariant");
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144 JavaThread* jt = (JavaThread*)thr;
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145 ThreadToNativeFromVM native(jt);
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146
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147 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag);
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148 while (g1h->full_collections_completed() <=
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149 _full_collections_completed_before) {
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150 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag);
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151 }
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152 }
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153 }
342
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154 }
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155
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156 void VM_CGC_Operation::doit() {
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157 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps);
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158 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty);
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159 TraceTime t(_printGCMessage, PrintGC, true, gclog_or_tty);
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160 SharedHeap* sh = SharedHeap::heap();
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161 // This could go away if CollectedHeap gave access to _gc_is_active...
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162 if (sh != NULL) {
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163 IsGCActiveMark x;
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164 _cl->do_void();
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165 } else {
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166 _cl->do_void();
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167 }
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168 }
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169
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170 bool VM_CGC_Operation::doit_prologue() {
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171 Heap_lock->lock();
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172 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = true;
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173 return true;
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174 }
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175
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176 void VM_CGC_Operation::doit_epilogue() {
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177 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = false;
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178 Heap_lock->unlock();
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179 }