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annotate src/share/vm/gc_implementation/g1/g1Allocator.cpp @ 20652:e8bf410d5e23

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8058209: Race in G1 card scanning could allow scanning of memory covered by PLABs Summary: Read _top before _gc_time_stamp in saved_mark_word() with LoadLoad order to ensure we get a consistent view Reviewed-by: brutisso, dcubed, dholmes, stefank
author mgerdin
date Fri, 14 Nov 2014 14:23:25 +0100
parents 227a9e5e4b4a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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20404
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1 /*
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2 * Copyright (c) 2014, 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/g1Allocator.hpp"
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27 #include "gc_implementation/g1/g1CollectedHeap.hpp"
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28 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
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29 #include "gc_implementation/g1/heapRegion.inline.hpp"
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30 #include "gc_implementation/g1/heapRegionSet.inline.hpp"
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31
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32 void G1DefaultAllocator::init_mutator_alloc_region() {
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33 assert(_mutator_alloc_region.get() == NULL, "pre-condition");
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34 _mutator_alloc_region.init();
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35 }
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36
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37 void G1DefaultAllocator::release_mutator_alloc_region() {
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38 _mutator_alloc_region.release();
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39 assert(_mutator_alloc_region.get() == NULL, "post-condition");
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40 }
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41
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42 void G1Allocator::reuse_retained_old_region(EvacuationInfo& evacuation_info,
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43 OldGCAllocRegion* old,
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44 HeapRegion** retained_old) {
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45 HeapRegion* retained_region = *retained_old;
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46 *retained_old = NULL;
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47
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48 // We will discard the current GC alloc region if:
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49 // a) it's in the collection set (it can happen!),
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50 // b) it's already full (no point in using it),
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51 // c) it's empty (this means that it was emptied during
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52 // a cleanup and it should be on the free list now), or
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53 // d) it's humongous (this means that it was emptied
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54 // during a cleanup and was added to the free list, but
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55 // has been subsequently used to allocate a humongous
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56 // object that may be less than the region size).
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57 if (retained_region != NULL &&
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58 !retained_region->in_collection_set() &&
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59 !(retained_region->top() == retained_region->end()) &&
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60 !retained_region->is_empty() &&
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61 !retained_region->isHumongous()) {
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62 retained_region->record_top_and_timestamp();
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63 // The retained region was added to the old region set when it was
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64 // retired. We have to remove it now, since we don't allow regions
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65 // we allocate to in the region sets. We'll re-add it later, when
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66 // it's retired again.
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67 _g1h->_old_set.remove(retained_region);
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68 bool during_im = _g1h->g1_policy()->during_initial_mark_pause();
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69 retained_region->note_start_of_copying(during_im);
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70 old->set(retained_region);
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71 _g1h->_hr_printer.reuse(retained_region);
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72 evacuation_info.set_alloc_regions_used_before(retained_region->used());
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73 }
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74 }
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75
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76 void G1DefaultAllocator::init_gc_alloc_regions(EvacuationInfo& evacuation_info) {
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77 assert_at_safepoint(true /* should_be_vm_thread */);
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78
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79 _survivor_gc_alloc_region.init();
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80 _old_gc_alloc_region.init();
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81 reuse_retained_old_region(evacuation_info,
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82 &_old_gc_alloc_region,
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83 &_retained_old_gc_alloc_region);
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84 }
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85
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86 void G1DefaultAllocator::release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info) {
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87 AllocationContext_t context = AllocationContext::current();
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88 evacuation_info.set_allocation_regions(survivor_gc_alloc_region(context)->count() +
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89 old_gc_alloc_region(context)->count());
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90 survivor_gc_alloc_region(context)->release();
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91 // If we have an old GC alloc region to release, we'll save it in
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92 // _retained_old_gc_alloc_region. If we don't
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93 // _retained_old_gc_alloc_region will become NULL. This is what we
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94 // want either way so no reason to check explicitly for either
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95 // condition.
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96 _retained_old_gc_alloc_region = old_gc_alloc_region(context)->release();
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97
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98 if (ResizePLAB) {
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99 _g1h->_survivor_plab_stats.adjust_desired_plab_sz(no_of_gc_workers);
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100 _g1h->_old_plab_stats.adjust_desired_plab_sz(no_of_gc_workers);
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101 }
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102 }
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103
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104 void G1DefaultAllocator::abandon_gc_alloc_regions() {
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105 assert(survivor_gc_alloc_region(AllocationContext::current())->get() == NULL, "pre-condition");
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106 assert(old_gc_alloc_region(AllocationContext::current())->get() == NULL, "pre-condition");
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107 _retained_old_gc_alloc_region = NULL;
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108 }
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109
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110 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) :
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111 ParGCAllocBuffer(gclab_word_size), _retired(true) { }
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112
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113 HeapWord* G1ParGCAllocator::allocate_slow(GCAllocPurpose purpose, size_t word_sz, AllocationContext_t context) {
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114 HeapWord* obj = NULL;
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115 size_t gclab_word_size = _g1h->desired_plab_sz(purpose);
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116 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) {
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117 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose, context);
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118 add_to_alloc_buffer_waste(alloc_buf->words_remaining());
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119 alloc_buf->retire(false /* end_of_gc */, false /* retain */);
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120
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121 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size, context);
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122 if (buf == NULL) {
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123 return NULL; // Let caller handle allocation failure.
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124 }
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125 // Otherwise.
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126 alloc_buf->set_word_size(gclab_word_size);
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127 alloc_buf->set_buf(buf);
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128
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129 obj = alloc_buf->allocate(word_sz);
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130 assert(obj != NULL, "buffer was definitely big enough...");
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131 } else {
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132 obj = _g1h->par_allocate_during_gc(purpose, word_sz, context);
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133 }
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134 return obj;
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135 }
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136
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137 G1DefaultParGCAllocator::G1DefaultParGCAllocator(G1CollectedHeap* g1h) :
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138 G1ParGCAllocator(g1h),
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139 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)),
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140 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)) {
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141
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142 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer;
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143 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer;
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144
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145 }
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146
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147 void G1DefaultParGCAllocator::retire_alloc_buffers() {
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148 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) {
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149 size_t waste = _alloc_buffers[ap]->words_remaining();
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150 add_to_alloc_buffer_waste(waste);
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151 _alloc_buffers[ap]->flush_stats_and_retire(_g1h->stats_for_purpose((GCAllocPurpose)ap),
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152 true /* end_of_gc */,
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153 false /* retain */);
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154 }
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155 }