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annotate src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp @ 6220:3a431b605145

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Merge
author jmasa
date Mon, 16 Jul 2012 13:00:26 -0700
parents d2a62e0f25eb 922993931b3d
children 194f52aa2f23
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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/concurrentG1Refine.hpp"
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27 #include "gc_implementation/g1/concurrentG1RefineThread.hpp"
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28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
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29 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
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30 #include "gc_implementation/g1/g1GCPhaseTimes.hpp"
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31 #include "gc_implementation/g1/g1RemSet.hpp"
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32 #include "gc_implementation/g1/heapRegionSeq.inline.hpp"
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33 #include "memory/space.inline.hpp"
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34 #include "runtime/atomic.hpp"
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35 #include "runtime/java.hpp"
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36 #include "utilities/copy.hpp"
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37
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38 // Possible sizes for the card counts cache: odd primes that roughly double in size.
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39 // (See jvmtiTagMap.cpp).
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40
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41 #define MAX_SIZE ((size_t) -1)
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42
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43 size_t ConcurrentG1Refine::_cc_cache_sizes[] = {
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44 16381, 32771, 76831, 150001, 307261,
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45 614563, 1228891, 2457733, 4915219, 9830479,
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46 19660831, 39321619, 78643219, 157286461, MAX_SIZE
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47 };
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48
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49 ConcurrentG1Refine::ConcurrentG1Refine() :
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50 _card_counts(NULL), _card_epochs(NULL),
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51 _n_card_counts(0), _max_cards(0), _max_n_card_counts(0),
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52 _cache_size_index(0), _expand_card_counts(false),
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53 _hot_cache(NULL),
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54 _def_use_cache(false), _use_cache(false),
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55 // We initialize the epochs of the array to 0. By initializing
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56 // _n_periods to 1 and not 0 we automatically invalidate all the
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57 // entries on the array. Otherwise we might accidentally think that
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58 // we claimed a card that was in fact never set (see CR7033292).
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59 _n_periods(1),
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60 _threads(NULL), _n_threads(0)
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61 {
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62
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63 // Ergomonically select initial concurrent refinement parameters
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64 if (FLAG_IS_DEFAULT(G1ConcRefinementGreenZone)) {
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65 FLAG_SET_DEFAULT(G1ConcRefinementGreenZone, MAX2<int>(ParallelGCThreads, 1));
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66 }
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67 set_green_zone(G1ConcRefinementGreenZone);
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68
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69 if (FLAG_IS_DEFAULT(G1ConcRefinementYellowZone)) {
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70 FLAG_SET_DEFAULT(G1ConcRefinementYellowZone, green_zone() * 3);
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71 }
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72 set_yellow_zone(MAX2<int>(G1ConcRefinementYellowZone, green_zone()));
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73
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74 if (FLAG_IS_DEFAULT(G1ConcRefinementRedZone)) {
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75 FLAG_SET_DEFAULT(G1ConcRefinementRedZone, yellow_zone() * 2);
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76 }
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77 set_red_zone(MAX2<int>(G1ConcRefinementRedZone, yellow_zone()));
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78 _n_worker_threads = thread_num();
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79 // We need one extra thread to do the young gen rset size sampling.
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80 _n_threads = _n_worker_threads + 1;
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81 reset_threshold_step();
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82
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83 _threads = NEW_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _n_threads, mtGC);
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84 int worker_id_offset = (int)DirtyCardQueueSet::num_par_ids();
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85 ConcurrentG1RefineThread *next = NULL;
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86 for (int i = _n_threads - 1; i >= 0; i--) {
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87 ConcurrentG1RefineThread* t = new ConcurrentG1RefineThread(this, next, worker_id_offset, i);
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88 assert(t != NULL, "Conc refine should have been created");
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89 assert(t->cg1r() == this, "Conc refine thread should refer to this");
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90 _threads[i] = t;
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91 next = t;
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92 }
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93 }
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94
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95 void ConcurrentG1Refine::reset_threshold_step() {
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96 if (FLAG_IS_DEFAULT(G1ConcRefinementThresholdStep)) {
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97 _thread_threshold_step = (yellow_zone() - green_zone()) / (worker_thread_num() + 1);
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98 } else {
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99 _thread_threshold_step = G1ConcRefinementThresholdStep;
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100 }
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101 }
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102
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103 int ConcurrentG1Refine::thread_num() {
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104 return MAX2<int>((G1ConcRefinementThreads > 0) ? G1ConcRefinementThreads : ParallelGCThreads, 1);
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105 }
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106
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107 void ConcurrentG1Refine::init() {
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108 if (G1ConcRSLogCacheSize > 0) {
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109 _g1h = G1CollectedHeap::heap();
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110
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111 _max_cards = _g1h->max_capacity() >> CardTableModRefBS::card_shift;
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112 _max_n_card_counts = _max_cards * G1MaxHotCardCountSizePercent / 100;
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113
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114 size_t max_card_num = ((size_t)1 << (sizeof(unsigned)*BitsPerByte-1)) - 1;
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115 guarantee(_max_cards < max_card_num, "card_num representation");
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116
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117 // We need _n_card_counts to be less than _max_n_card_counts here
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118 // so that the expansion call (below) actually allocates the
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119 // _counts and _epochs arrays.
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120 assert(_n_card_counts == 0, "pre-condition");
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121 assert(_max_n_card_counts > 0, "pre-condition");
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122
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123 // Find the index into cache size array that is of a size that's
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124 // large enough to hold desired_sz.
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125 size_t desired_sz = _max_cards / InitialCacheFraction;
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126 int desired_sz_index = 0;
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127 while (_cc_cache_sizes[desired_sz_index] < desired_sz) {
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128 desired_sz_index += 1;
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129 assert(desired_sz_index < MAX_CC_CACHE_INDEX, "invariant");
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130 }
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131 assert(desired_sz_index < MAX_CC_CACHE_INDEX, "invariant");
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132
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133 // If the desired_sz value is between two sizes then
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134 // _cc_cache_sizes[desired_sz_index-1] < desired_sz <= _cc_cache_sizes[desired_sz_index]
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135 // we will start with the lower size in the optimistic expectation that
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136 // we will not need to expand up. Note desired_sz_index could also be 0.
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137 if (desired_sz_index > 0 &&
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138 _cc_cache_sizes[desired_sz_index] > desired_sz) {
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139 desired_sz_index -= 1;
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140 }
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141
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142 if (!expand_card_count_cache(desired_sz_index)) {
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143 // Allocation was unsuccessful - exit
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144 vm_exit_during_initialization("Could not reserve enough space for card count cache");
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145 }
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146 assert(_n_card_counts > 0, "post-condition");
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147 assert(_cache_size_index == desired_sz_index, "post-condition");
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148
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149 Copy::fill_to_bytes(&_card_counts[0],
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150 _n_card_counts * sizeof(CardCountCacheEntry));
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151 Copy::fill_to_bytes(&_card_epochs[0], _n_card_counts * sizeof(CardEpochCacheEntry));
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152
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153 ModRefBarrierSet* bs = _g1h->mr_bs();
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154 guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition");
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155 _ct_bs = (CardTableModRefBS*)bs;
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156 _ct_bot = _ct_bs->byte_for_const(_g1h->reserved_region().start());
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157
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158 _def_use_cache = true;
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159 _use_cache = true;
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160 _hot_cache_size = (1 << G1ConcRSLogCacheSize);
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161 _hot_cache = NEW_C_HEAP_ARRAY(jbyte*, _hot_cache_size, mtGC);
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162 _n_hot = 0;
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163 _hot_cache_idx = 0;
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15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
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164
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165 // For refining the cards in the hot cache in parallel
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166 int n_workers = (ParallelGCThreads > 0 ?
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167 _g1h->workers()->total_workers() : 1);
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168 _hot_cache_par_chunk_size = MAX2(1, _hot_cache_size / n_workers);
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169 _hot_cache_par_claimed_idx = 0;
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170 }
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171 }
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172
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173 void ConcurrentG1Refine::stop() {
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174 if (_threads != NULL) {
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175 for (int i = 0; i < _n_threads; i++) {
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176 _threads[i]->stop();
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177 }
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178 }
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179 }
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180
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181 void ConcurrentG1Refine::reinitialize_threads() {
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182 reset_threshold_step();
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183 if (_threads != NULL) {
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184 for (int i = 0; i < _n_threads; i++) {
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185 _threads[i]->initialize();
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186 }
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187 }
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188 }
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189
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190 ConcurrentG1Refine::~ConcurrentG1Refine() {
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191 if (G1ConcRSLogCacheSize > 0) {
2431
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192 // Please see the comment in allocate_card_count_cache
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193 // for why we call os::malloc() and os::free() directly.
342
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194 assert(_card_counts != NULL, "Logic");
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195 os::free(_card_counts, mtGC);
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196 assert(_card_epochs != NULL, "Logic");
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197 os::free(_card_epochs, mtGC);
2431
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198
342
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199 assert(_hot_cache != NULL, "Logic");
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200 FREE_C_HEAP_ARRAY(jbyte*, _hot_cache, mtGC);
342
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201 }
794
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202 if (_threads != NULL) {
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203 for (int i = 0; i < _n_threads; i++) {
315a5d70b295 6484957: G1: parallel concurrent refinement
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204 delete _threads[i];
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205 }
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206 FREE_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _threads, mtGC);
342
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207 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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208 }
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209
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210 void ConcurrentG1Refine::threads_do(ThreadClosure *tc) {
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211 if (_threads != NULL) {
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212 for (int i = 0; i < _n_threads; i++) {
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213 tc->do_thread(_threads[i]);
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214 }
342
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215 }
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216 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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217
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218 bool ConcurrentG1Refine::is_young_card(jbyte* card_ptr) {
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219 HeapWord* start = _ct_bs->addr_for(card_ptr);
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220 HeapRegion* r = _g1h->heap_region_containing(start);
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221 if (r != NULL && r->is_young()) {
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222 return true;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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223 }
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224 // This card is not associated with a heap region
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225 // so can't be young.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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226 return false;
342
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227 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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228
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229 jbyte* ConcurrentG1Refine::add_card_count(jbyte* card_ptr, int* count, bool* defer) {
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230 unsigned new_card_num = ptr_2_card_num(card_ptr);
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231 unsigned bucket = hash(new_card_num);
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232 assert(0 <= bucket && bucket < _n_card_counts, "Bounds");
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233
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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234 CardCountCacheEntry* count_ptr = &_card_counts[bucket];
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235 CardEpochCacheEntry* epoch_ptr = &_card_epochs[bucket];
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236
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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237 // We have to construct a new entry if we haven't updated the counts
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238 // during the current period, or if the count was updated for a
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
239 // different card number.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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240 unsigned int new_epoch = (unsigned int) _n_periods;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
241 julong new_epoch_entry = make_epoch_entry(new_card_num, new_epoch);
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242
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
243 while (true) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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244 // Fetch the previous epoch value
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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245 julong prev_epoch_entry = epoch_ptr->_value;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
246 julong cas_res;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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247
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
248 if (extract_epoch(prev_epoch_entry) != new_epoch) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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249 // This entry has not yet been updated during this period.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
250 // Note: we update the epoch value atomically to ensure
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
251 // that there is only one winner that updates the cached
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
252 // card_ptr value even though all the refine threads share
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
253 // the same epoch value.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
254
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
255 cas_res = (julong) Atomic::cmpxchg((jlong) new_epoch_entry,
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
256 (volatile jlong*)&epoch_ptr->_value,
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
257 (jlong) prev_epoch_entry);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
258
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
259 if (cas_res == prev_epoch_entry) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
260 // We have successfully won the race to update the
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
261 // epoch and card_num value. Make it look like the
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
262 // count and eviction count were previously cleared.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
263 count_ptr->_count = 1;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
264 count_ptr->_evict_count = 0;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
265 *count = 0;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
266 // We can defer the processing of card_ptr
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
267 *defer = true;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
268 return card_ptr;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
269 }
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diff changeset
270 // We did not win the race to update the epoch field, so some other
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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271 // thread must have done it. The value that gets returned by CAS
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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272 // should be the new epoch value.
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273 assert(extract_epoch(cas_res) == new_epoch, "unexpected epoch");
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diff changeset
274 // We could 'continue' here or just re-read the previous epoch value
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diff changeset
275 prev_epoch_entry = epoch_ptr->_value;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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276 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
277
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
278 // The epoch entry for card_ptr has been updated during this period.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
279 unsigned old_card_num = extract_card_num(prev_epoch_entry);
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diff changeset
280
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
281 // The card count that will be returned to caller
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
282 *count = count_ptr->_count;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
283
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
284 // Are we updating the count for the same card?
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
285 if (new_card_num == old_card_num) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
286 // Same card - just update the count. We could have more than one
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
287 // thread racing to update count for the current card. It should be
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
288 // OK not to use a CAS as the only penalty should be some missed
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
289 // increments of the count which delays identifying the card as "hot".
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
290
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
291 if (*count < max_jubyte) count_ptr->_count++;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
292 // We can defer the processing of card_ptr
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
293 *defer = true;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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diff changeset
294 return card_ptr;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
295 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
296
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
297 // Different card - evict old card info
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
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diff changeset
298 if (count_ptr->_evict_count < max_jubyte) count_ptr->_evict_count++;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
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parents: 889
diff changeset
299 if (count_ptr->_evict_count > G1CardCountCacheExpandThreshold) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
300 // Trigger a resize the next time we clear
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
301 _expand_card_counts = true;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
302 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
303
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
304 cas_res = (julong) Atomic::cmpxchg((jlong) new_epoch_entry,
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
305 (volatile jlong*)&epoch_ptr->_value,
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
306 (jlong) prev_epoch_entry);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
307
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
308 if (cas_res == prev_epoch_entry) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
309 // We successfully updated the card num value in the epoch entry
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
310 count_ptr->_count = 0; // initialize counter for new card num
1666
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
311 jbyte* old_card_ptr = card_num_2_ptr(old_card_num);
890
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
312
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
313 // Even though the region containg the card at old_card_num was not
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
314 // in the young list when old_card_num was recorded in the epoch
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
315 // cache it could have been added to the free list and subsequently
1666
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
316 // added to the young list in the intervening time. See CR 6817995.
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
317 // We do not deal with this case here - it will be handled in
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
318 // HeapRegion::oops_on_card_seq_iterate_careful after it has been
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
319 // determined that the region containing the card has been allocated
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
320 // to, and it's safe to check the young type of the region.
890
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
321
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
322 // We do not want to defer processing of card_ptr in this case
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
323 // (we need to refine old_card_ptr and card_ptr)
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
324 *defer = false;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
325 return old_card_ptr;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
326 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
327 // Someone else beat us - try again.
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
328 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
329 }
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
330
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
331 jbyte* ConcurrentG1Refine::cache_insert(jbyte* card_ptr, bool* defer) {
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
332 int count;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
333 jbyte* cached_ptr = add_card_count(card_ptr, &count, defer);
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
334 assert(cached_ptr != NULL, "bad cached card ptr");
1246
deada8912c54 6914402: G1: assert(!is_young_card(cached_ptr),"shouldn't get a card in young region")
johnc
parents: 1111
diff changeset
335
1666
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
336 // We've just inserted a card pointer into the card count cache
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
337 // and got back the card that we just inserted or (evicted) the
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
338 // previous contents of that count slot.
1246
deada8912c54 6914402: G1: assert(!is_young_card(cached_ptr),"shouldn't get a card in young region")
johnc
parents: 1111
diff changeset
339
1666
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
340 // The card we got back could be in a young region. When the
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
341 // returned card (if evicted) was originally inserted, we had
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
342 // determined that its containing region was not young. However
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
343 // it is possible for the region to be freed during a cleanup
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
344 // pause, then reallocated and tagged as young which will result
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
345 // in the returned card residing in a young region.
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
346 //
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
347 // We do not deal with this case here - the change from non-young
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
348 // to young could be observed at any time - it will be handled in
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
349 // HeapRegion::oops_on_card_seq_iterate_careful after it has been
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
350 // determined that the region containing the card has been allocated
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
351 // to.
890
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
352
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
353 // The card pointer we obtained from card count cache is not hot
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
354 // so do not store it in the cache; return it for immediate
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
355 // refining.
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
356 if (count < G1ConcRSHotCardLimit) {
890
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
357 return cached_ptr;
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
358 }
890
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
359
1666
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
360 // Otherwise, the pointer we got from the _card_counts cache is hot.
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
361 jbyte* res = NULL;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
362 MutexLockerEx x(HotCardCache_lock, Mutex::_no_safepoint_check_flag);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
363 if (_n_hot == _hot_cache_size) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
364 res = _hot_cache[_hot_cache_idx];
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
365 _n_hot--;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
366 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
367 // Now _n_hot < _hot_cache_size, and we can insert at _hot_cache_idx.
890
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
368 _hot_cache[_hot_cache_idx] = cached_ptr;
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
369 _hot_cache_idx++;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
370 if (_hot_cache_idx == _hot_cache_size) _hot_cache_idx = 0;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
371 _n_hot++;
890
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
372
1666
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
373 // The card obtained from the hot card cache could be in a young
5cbac8938c4c 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 1552
diff changeset
374 // region. See above on how this can happen.
890
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
375
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
376 return res;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
377 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
378
1705
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
379 void ConcurrentG1Refine::clean_up_cache(int worker_i,
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
380 G1RemSet* g1rs,
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
381 DirtyCardQueue* into_cset_dcq) {
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
382 assert(!use_cache(), "cache should be disabled");
889
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
johnc
parents: 844
diff changeset
383 int start_idx;
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
johnc
parents: 844
diff changeset
384
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
johnc
parents: 844
diff changeset
385 while ((start_idx = _hot_cache_par_claimed_idx) < _n_hot) { // read once
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
johnc
parents: 844
diff changeset
386 int end_idx = start_idx + _hot_cache_par_chunk_size;
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
johnc
parents: 844
diff changeset
387
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
johnc
parents: 844
diff changeset
388 if (start_idx ==
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
johnc
parents: 844
diff changeset
389 Atomic::cmpxchg(end_idx, &_hot_cache_par_claimed_idx, start_idx)) {
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
johnc
parents: 844
diff changeset
390 // The current worker has successfully claimed the chunk [start_idx..end_idx)
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
johnc
parents: 844
diff changeset
391 end_idx = MIN2(end_idx, _n_hot);
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
johnc
parents: 844
diff changeset
392 for (int i = start_idx; i < end_idx; i++) {
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
johnc
parents: 844
diff changeset
393 jbyte* entry = _hot_cache[i];
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
johnc
parents: 844
diff changeset
394 if (entry != NULL) {
1705
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
395 if (g1rs->concurrentRefineOneCard(entry, worker_i, true)) {
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
396 // 'entry' contains references that point into the current
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
397 // collection set. We need to record 'entry' in the DCQS
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
398 // that's used for that purpose.
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
399 //
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
400 // The only time we care about recording cards that contain
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
401 // references that point into the collection set is during
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
402 // RSet updating while within an evacuation pause.
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
403 // In this case worker_i should be the id of a GC worker thread
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
404 assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause");
2364
04d1138b4cce 7023747: G1: too strict assert in RefineRecordRefsIntoCSCardTableEntryClosure::do_card_ptr in g1RemSet.cpp
brutisso
parents: 2188
diff changeset
405 assert(worker_i < (int) (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), "incorrect worker id");
1705
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
406 into_cset_dcq->enqueue(entry);
2d160770d2e5 6814437: G1: remove the _new_refs array
johnc
parents: 1666
diff changeset
407 }
889
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
johnc
parents: 844
diff changeset
408 }
15c5903cf9e1 6865703: G1: Parallelize hot card cache cleanup
johnc
parents: 844
diff changeset
409 }
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
410 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
411 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
412 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
413
2431
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
414 // The arrays used to hold the card counts and the epochs must have
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
415 // a 1:1 correspondence. Hence they are allocated and freed together
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
416 // Returns true if the allocations of both the counts and epochs
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
417 // were successful; false otherwise.
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
418 bool ConcurrentG1Refine::allocate_card_count_cache(size_t n,
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
419 CardCountCacheEntry** counts,
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
420 CardEpochCacheEntry** epochs) {
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
421 // We call the allocation/free routines directly for the counts
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
422 // and epochs arrays. The NEW_C_HEAP_ARRAY/FREE_C_HEAP_ARRAY
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
423 // macros call AllocateHeap and FreeHeap respectively.
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
424 // AllocateHeap will call vm_exit_out_of_memory in the event
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
425 // of an allocation failure and abort the JVM. With the
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
426 // _counts/epochs arrays we only need to abort the JVM if the
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
427 // initial allocation of these arrays fails.
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
428 //
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
429 // Additionally AllocateHeap/FreeHeap do some tracing of
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
430 // allocate/free calls so calling one without calling the
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
431 // other can cause inconsistencies in the tracing. So we
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
432 // call neither.
890
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
433
2431
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
434 assert(*counts == NULL, "out param");
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
435 assert(*epochs == NULL, "out param");
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
436
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
437 size_t counts_size = n * sizeof(CardCountCacheEntry);
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
438 size_t epochs_size = n * sizeof(CardEpochCacheEntry);
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
439
6197
d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 2434
diff changeset
440 *counts = (CardCountCacheEntry*) os::malloc(counts_size, mtGC);
2431
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
441 if (*counts == NULL) {
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
442 // allocation was unsuccessful
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
443 return false;
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
444 }
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
445
6197
d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 2434
diff changeset
446 *epochs = (CardEpochCacheEntry*) os::malloc(epochs_size, mtGC);
2431
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
447 if (*epochs == NULL) {
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
448 // allocation was unsuccessful - free counts array
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
449 assert(*counts != NULL, "must be");
6197
d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 2434
diff changeset
450 os::free(*counts, mtGC);
2431
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
451 *counts = NULL;
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
452 return false;
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
453 }
890
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
454
2431
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
455 // We successfully allocated both counts and epochs
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
456 return true;
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
457 }
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
458
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
459 // Returns true if the card counts/epochs cache was
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
460 // successfully expanded; false otherwise.
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
461 bool ConcurrentG1Refine::expand_card_count_cache(int cache_size_idx) {
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
462 // Can we expand the card count and epoch tables?
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
463 if (_n_card_counts < _max_n_card_counts) {
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
464 assert(cache_size_idx >= 0 && cache_size_idx < MAX_CC_CACHE_INDEX, "oob");
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
465
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
466 size_t cache_size = _cc_cache_sizes[cache_size_idx];
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
467 // Make sure we don't go bigger than we will ever need
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
468 cache_size = MIN2(cache_size, _max_n_card_counts);
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
469
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
470 // Should we expand the card count and card epoch tables?
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
471 if (cache_size > _n_card_counts) {
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
472 // We have been asked to allocate new, larger, arrays for
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
473 // the card counts and the epochs. Attempt the allocation
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
474 // of both before we free the existing arrays in case
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
475 // the allocation is unsuccessful...
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
476 CardCountCacheEntry* counts = NULL;
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
477 CardEpochCacheEntry* epochs = NULL;
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
478
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
479 if (allocate_card_count_cache(cache_size, &counts, &epochs)) {
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
480 // Allocation was successful.
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
481 // We can just free the old arrays; we're
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
482 // not interested in preserving the contents
6197
d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 2434
diff changeset
483 if (_card_counts != NULL) os::free(_card_counts, mtGC);
d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 2434
diff changeset
484 if (_card_epochs != NULL) os::free(_card_epochs, mtGC);
2431
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
485
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
486 // Cache the size of the arrays and the index that got us there.
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
487 _n_card_counts = cache_size;
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
488 _cache_size_index = cache_size_idx;
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
489
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
490 _card_counts = counts;
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
491 _card_epochs = epochs;
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
492
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
493 // We successfully allocated/expanded the caches.
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
494 return true;
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
495 }
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
496 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
497 }
2431
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
498
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
499 // We did not successfully expand the caches.
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
500 return false;
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
501 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
502
890
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
503 void ConcurrentG1Refine::clear_and_record_card_counts() {
6219
922993931b3d 7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents: 2434
diff changeset
504 if (G1ConcRSLogCacheSize == 0) {
922993931b3d 7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents: 2434
diff changeset
505 return;
922993931b3d 7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents: 2434
diff changeset
506 }
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
507
890
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
508 double start = os::elapsedTime();
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
509
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
510 if (_expand_card_counts) {
2431
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
511 int new_idx = _cache_size_index + 1;
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
512
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
513 if (expand_card_count_cache(new_idx)) {
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
514 // Allocation was successful and _n_card_counts has
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
515 // been updated to the new size. We only need to clear
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
516 // the epochs so we don't read a bogus epoch value
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
517 // when inserting a card into the hot card cache.
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
518 Copy::fill_to_bytes(&_card_epochs[0], _n_card_counts * sizeof(CardEpochCacheEntry));
02f49b66361a 7026932: G1: No need to abort VM when card count cache expansion fails
johnc
parents: 2364
diff changeset
519 }
890
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
520 _expand_card_counts = false;
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
521 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
522
890
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
523 int this_epoch = (int) _n_periods;
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
524 assert((this_epoch+1) <= max_jint, "to many periods");
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
525 // Update epoch
6cb8e9df7174 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 889
diff changeset
526 _n_periods++;
6219
922993931b3d 7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents: 2434
diff changeset
527 double cc_clear_time_ms = (os::elapsedTime() - start) * 1000;
922993931b3d 7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents: 2434
diff changeset
528 _g1h->g1_policy()->phase_times()->record_cc_clear_time_ms(cc_clear_time_ms);
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
529 }
1019
035d2e036a9b 6885041: G1: inconsistent thread dump
tonyp
parents: 890
diff changeset
530
035d2e036a9b 6885041: G1: inconsistent thread dump
tonyp
parents: 890
diff changeset
531 void ConcurrentG1Refine::print_worker_threads_on(outputStream* st) const {
035d2e036a9b 6885041: G1: inconsistent thread dump
tonyp
parents: 890
diff changeset
532 for (int i = 0; i < _n_threads; ++i) {
035d2e036a9b 6885041: G1: inconsistent thread dump
tonyp
parents: 890
diff changeset
533 _threads[i]->print_on(st);
035d2e036a9b 6885041: G1: inconsistent thread dump
tonyp
parents: 890
diff changeset
534 st->cr();
035d2e036a9b 6885041: G1: inconsistent thread dump
tonyp
parents: 890
diff changeset
535 }
035d2e036a9b 6885041: G1: inconsistent thread dump
tonyp
parents: 890
diff changeset
536 }