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annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.inline.hpp @ 12835:69944b868a32

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8014555: G1: Memory ordering problem with Conc refinement and card marking Summary: Add a StoreLoad barrier in the G1 post-barrier to fix a race with concurrent refinement. Also-reviewed-by: martin.doerr@sap.com Reviewed-by: iveresov, tschatzl, brutisso, roland, kvn
author mgerdin
date Tue, 08 Oct 2013 17:35:51 +0200
parents d55c004e1d4d
children 096c224171c4 de6a9e811145
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP
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27
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28 #include "gc_implementation/g1/concurrentMark.hpp"
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29 #include "gc_implementation/g1/g1CollectedHeap.hpp"
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30 #include "gc_implementation/g1/g1AllocRegion.inline.hpp"
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31 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
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32 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
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33 #include "gc_implementation/g1/heapRegionSeq.inline.hpp"
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34 #include "utilities/taskqueue.hpp"
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35
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36 // Inline functions for G1CollectedHeap
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37
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38 template <class T>
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39 inline HeapRegion*
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40 G1CollectedHeap::heap_region_containing(const T addr) const {
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41 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) addr);
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42 // hr can be null if addr in perm_gen
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43 if (hr != NULL && hr->continuesHumongous()) {
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44 hr = hr->humongous_start_region();
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45 }
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46 return hr;
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47 }
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48
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49 template <class T>
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50 inline HeapRegion*
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51 G1CollectedHeap::heap_region_containing_raw(const T addr) const {
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52 assert(_g1_reserved.contains((const void*) addr), "invariant");
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53 HeapRegion* res = _hrs.addr_to_region_unsafe((HeapWord*) addr);
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54 return res;
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55 }
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56
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57 inline bool G1CollectedHeap::obj_in_cs(oop obj) {
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58 HeapRegion* r = _hrs.addr_to_region((HeapWord*) obj);
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59 return r != NULL && r->in_collection_set();
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60 }
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61
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62 inline HeapWord*
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63 G1CollectedHeap::attempt_allocation(size_t word_size,
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64 unsigned int* gc_count_before_ret,
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65 int* gclocker_retry_count_ret) {
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66 assert_heap_not_locked_and_not_at_safepoint();
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67 assert(!isHumongous(word_size), "attempt_allocation() should not "
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68 "be called for humongous allocation requests");
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69
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70 HeapWord* result = _mutator_alloc_region.attempt_allocation(word_size,
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71 false /* bot_updates */);
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72 if (result == NULL) {
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73 result = attempt_allocation_slow(word_size,
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74 gc_count_before_ret,
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75 gclocker_retry_count_ret);
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76 }
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77 assert_heap_not_locked();
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78 if (result != NULL) {
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79 dirty_young_block(result, word_size);
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80 }
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81 return result;
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82 }
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83
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84 inline HeapWord* G1CollectedHeap::survivor_attempt_allocation(size_t
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85 word_size) {
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86 assert(!isHumongous(word_size),
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87 "we should not be seeing humongous-size allocations in this path");
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88
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89 HeapWord* result = _survivor_gc_alloc_region.attempt_allocation(word_size,
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90 false /* bot_updates */);
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91 if (result == NULL) {
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92 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
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93 result = _survivor_gc_alloc_region.attempt_allocation_locked(word_size,
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94 false /* bot_updates */);
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95 }
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96 if (result != NULL) {
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97 dirty_young_block(result, word_size);
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98 }
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99 return result;
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100 }
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101
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102 inline HeapWord* G1CollectedHeap::old_attempt_allocation(size_t word_size) {
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103 assert(!isHumongous(word_size),
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104 "we should not be seeing humongous-size allocations in this path");
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105
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106 HeapWord* result = _old_gc_alloc_region.attempt_allocation(word_size,
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107 true /* bot_updates */);
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108 if (result == NULL) {
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109 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
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110 result = _old_gc_alloc_region.attempt_allocation_locked(word_size,
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111 true /* bot_updates */);
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112 }
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113 return result;
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114 }
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115
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116 // It dirties the cards that cover the block so that so that the post
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117 // write barrier never queues anything when updating objects on this
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118 // block. It is assumed (and in fact we assert) that the block
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119 // belongs to a young region.
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120 inline void
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121 G1CollectedHeap::dirty_young_block(HeapWord* start, size_t word_size) {
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122 assert_heap_not_locked();
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123
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124 // Assign the containing region to containing_hr so that we don't
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125 // have to keep calling heap_region_containing_raw() in the
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126 // asserts below.
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127 DEBUG_ONLY(HeapRegion* containing_hr = heap_region_containing_raw(start);)
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128 assert(containing_hr != NULL && start != NULL && word_size > 0,
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129 "pre-condition");
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130 assert(containing_hr->is_in(start), "it should contain start");
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131 assert(containing_hr->is_young(), "it should be young");
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132 assert(!containing_hr->isHumongous(), "it should not be humongous");
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133
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134 HeapWord* end = start + word_size;
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135 assert(containing_hr->is_in(end - 1), "it should also contain end - 1");
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136
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137 MemRegion mr(start, end);
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138 g1_barrier_set()->g1_mark_as_young(mr);
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139 }
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140
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141 inline RefToScanQueue* G1CollectedHeap::task_queue(int i) const {
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142 return _task_queues->queue(i);
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143 }
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144
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145 inline bool G1CollectedHeap::isMarkedPrev(oop obj) const {
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146 return _cm->prevMarkBitMap()->isMarked((HeapWord *)obj);
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147 }
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148
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149 inline bool G1CollectedHeap::isMarkedNext(oop obj) const {
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150 return _cm->nextMarkBitMap()->isMarked((HeapWord *)obj);
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151 }
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152
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153 #ifndef PRODUCT
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154 // Support for G1EvacuationFailureALot
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155
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156 inline bool
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157 G1CollectedHeap::evacuation_failure_alot_for_gc_type(bool gcs_are_young,
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158 bool during_initial_mark,
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159 bool during_marking) {
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160 bool res = false;
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161 if (during_marking) {
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162 res |= G1EvacuationFailureALotDuringConcMark;
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163 }
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164 if (during_initial_mark) {
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165 res |= G1EvacuationFailureALotDuringInitialMark;
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166 }
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167 if (gcs_are_young) {
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168 res |= G1EvacuationFailureALotDuringYoungGC;
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169 } else {
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170 // GCs are mixed
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171 res |= G1EvacuationFailureALotDuringMixedGC;
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172 }
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173 return res;
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174 }
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175
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176 inline void
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177 G1CollectedHeap::set_evacuation_failure_alot_for_current_gc() {
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178 if (G1EvacuationFailureALot) {
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179 // Note we can't assert that _evacuation_failure_alot_for_current_gc
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180 // is clear here. It may have been set during a previous GC but that GC
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181 // did not copy enough objects (i.e. G1EvacuationFailureALotCount) to
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182 // trigger an evacuation failure and clear the flags and and counts.
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183
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184 // Check if we have gone over the interval.
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185 const size_t gc_num = total_collections();
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186 const size_t elapsed_gcs = gc_num - _evacuation_failure_alot_gc_number;
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187
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188 _evacuation_failure_alot_for_current_gc = (elapsed_gcs >= G1EvacuationFailureALotInterval);
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189
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190 // Now check if G1EvacuationFailureALot is enabled for the current GC type.
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191 const bool gcs_are_young = g1_policy()->gcs_are_young();
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192 const bool during_im = g1_policy()->during_initial_mark_pause();
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193 const bool during_marking = mark_in_progress();
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194
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195 _evacuation_failure_alot_for_current_gc &=
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196 evacuation_failure_alot_for_gc_type(gcs_are_young,
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197 during_im,
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198 during_marking);
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199 }
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200 }
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201
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202 inline bool
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203 G1CollectedHeap::evacuation_should_fail() {
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204 if (!G1EvacuationFailureALot || !_evacuation_failure_alot_for_current_gc) {
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205 return false;
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206 }
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207 // G1EvacuationFailureALot is in effect for current GC
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208 // Access to _evacuation_failure_alot_count is not atomic;
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209 // the value does not have to be exact.
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210 if (++_evacuation_failure_alot_count < G1EvacuationFailureALotCount) {
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211 return false;
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212 }
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213 _evacuation_failure_alot_count = 0;
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214 return true;
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215 }
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216
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217 inline void G1CollectedHeap::reset_evacuation_should_fail() {
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218 if (G1EvacuationFailureALot) {
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219 _evacuation_failure_alot_gc_number = total_collections();
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220 _evacuation_failure_alot_count = 0;
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221 _evacuation_failure_alot_for_current_gc = false;
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222 }
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223 }
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224 #endif // #ifndef PRODUCT
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225
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226 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP