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annotate src/share/vm/gc_implementation/g1/concurrentG1Refine.hpp @ 1311:2a1472c30599

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4396719: Mark Sweep stack overflow on deeply nested Object arrays Summary: Use an explicit stack for object arrays and process them in chunks. Reviewed-by: iveresov, apetrusenko
author jcoomes
date Wed, 03 Mar 2010 14:48:26 -0800
parents b81f3572f355
children c18cbe5936b8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // Forward decl
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26 class ConcurrentG1RefineThread;
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27 class G1RemSet;
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28
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29 class ConcurrentG1Refine: public CHeapObj {
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30 ConcurrentG1RefineThread** _threads;
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31 int _n_threads;
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32 int _n_worker_threads;
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33 /*
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34 * The value of the update buffer queue length falls into one of 3 zones:
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35 * green, yellow, red. If the value is in [0, green) nothing is
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36 * done, the buffers are left unprocessed to enable the caching effect of the
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37 * dirtied cards. In the yellow zone [green, yellow) the concurrent refinement
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38 * threads are gradually activated. In [yellow, red) all threads are
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39 * running. If the length becomes red (max queue length) the mutators start
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40 * processing the buffers.
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41 *
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42 * There are some interesting cases (when G1UseAdaptiveConcRefinement
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43 * is turned off):
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44 * 1) green = yellow = red = 0. In this case the mutator will process all
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45 * buffers. Except for those that are created by the deferred updates
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46 * machinery during a collection.
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47 * 2) green = 0. Means no caching. Can be a good way to minimize the
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48 * amount of time spent updating rsets during a collection.
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49 */
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50 int _green_zone;
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51 int _yellow_zone;
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52 int _red_zone;
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53
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54 int _thread_threshold_step;
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55
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56 // Reset the threshold step value based of the current zone boundaries.
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57 void reset_threshold_step();
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58
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59 // The cache for card refinement.
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60 bool _use_cache;
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61 bool _def_use_cache;
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62
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63 size_t _n_periods; // Used as clearing epoch
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64
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65 // An evicting cache of the number of times each card
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66 // is accessed. Reduces, but does not eliminate, the amount
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67 // of duplicated processing of dirty cards.
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68
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69 enum SomePrivateConstants {
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70 epoch_bits = 32,
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71 card_num_shift = epoch_bits,
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72 epoch_mask = AllBits,
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73 card_num_mask = AllBits,
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74
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75 // The initial cache size is approximately this fraction
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76 // of a maximal cache (i.e. the size needed for all cards
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77 // in the heap)
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78 InitialCacheFraction = 512
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79 };
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80
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81 const static julong card_num_mask_in_place =
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82 (julong) card_num_mask << card_num_shift;
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83
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84 typedef struct {
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85 julong _value; // | card_num | epoch |
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86 } CardEpochCacheEntry;
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87
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88 julong make_epoch_entry(unsigned int card_num, unsigned int epoch) {
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89 assert(0 <= card_num && card_num < _max_n_card_counts, "Bounds");
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90 assert(0 <= epoch && epoch <= _n_periods, "must be");
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91
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92 return ((julong) card_num << card_num_shift) | epoch;
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93 }
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94
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95 unsigned int extract_epoch(julong v) {
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96 return (v & epoch_mask);
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97 }
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98
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99 unsigned int extract_card_num(julong v) {
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100 return (v & card_num_mask_in_place) >> card_num_shift;
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101 }
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102
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103 typedef struct {
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104 unsigned char _count;
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105 unsigned char _evict_count;
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106 } CardCountCacheEntry;
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107
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108 CardCountCacheEntry* _card_counts;
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109 CardEpochCacheEntry* _card_epochs;
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110
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111 // The current number of buckets in the card count cache
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112 unsigned _n_card_counts;
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113
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114 // The max number of buckets required for the number of
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115 // cards for the entire reserved heap
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116 unsigned _max_n_card_counts;
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117
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118 // Possible sizes of the cache: odd primes that roughly double in size.
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119 // (See jvmtiTagMap.cpp).
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120 static int _cc_cache_sizes[];
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121
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122 // The index in _cc_cache_sizes corresponding to the size of
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123 // _card_counts.
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124 int _cache_size_index;
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125
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126 bool _expand_card_counts;
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127
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128 const jbyte* _ct_bot;
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129
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130 jbyte** _hot_cache;
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131 int _hot_cache_size;
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132 int _n_hot;
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133 int _hot_cache_idx;
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134
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135 int _hot_cache_par_chunk_size;
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136 volatile int _hot_cache_par_claimed_idx;
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137
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138 // Needed to workaround 6817995
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139 CardTableModRefBS* _ct_bs;
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140 G1CollectedHeap* _g1h;
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141
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142 // Expands the array that holds the card counts to the next size up
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143 void expand_card_count_cache();
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144
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145 // hash a given key (index of card_ptr) with the specified size
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146 static unsigned int hash(size_t key, int size) {
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147 return (unsigned int) key % size;
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148 }
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149
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150 // hash a given key (index of card_ptr)
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151 unsigned int hash(size_t key) {
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152 return hash(key, _n_card_counts);
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153 }
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154
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155 unsigned ptr_2_card_num(jbyte* card_ptr) {
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156 return (unsigned) (card_ptr - _ct_bot);
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157 }
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158
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159 jbyte* card_num_2_ptr(unsigned card_num) {
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160 return (jbyte*) (_ct_bot + card_num);
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161 }
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162
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163 // Returns the count of this card after incrementing it.
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164 jbyte* add_card_count(jbyte* card_ptr, int* count, bool* defer);
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165
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166 // Returns true if this card is in a young region
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167 bool is_young_card(jbyte* card_ptr);
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168
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169 public:
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170 ConcurrentG1Refine();
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171 ~ConcurrentG1Refine();
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172
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173 void init(); // Accomplish some initialization that has to wait.
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174 void stop();
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175
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176 void reinitialize_threads();
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177
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178 // Iterate over the conc refine threads
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179 void threads_do(ThreadClosure *tc);
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180
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181 // If this is the first entry for the slot, writes into the cache and
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182 // returns NULL. If it causes an eviction, returns the evicted pointer.
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183 // Otherwise, its a cache hit, and returns NULL.
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184 jbyte* cache_insert(jbyte* card_ptr, bool* defer);
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185
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186 // Process the cached entries.
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187 void clean_up_cache(int worker_i, G1RemSet* g1rs);
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188
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189 // Set up for parallel processing of the cards in the hot cache
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190 void clear_hot_cache_claimed_index() {
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191 _hot_cache_par_claimed_idx = 0;
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192 }
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193
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194 // Discard entries in the hot cache.
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195 void clear_hot_cache() {
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196 _hot_cache_idx = 0; _n_hot = 0;
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197 }
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198
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199 bool hot_cache_is_empty() { return _n_hot == 0; }
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200
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201 bool use_cache() { return _use_cache; }
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202 void set_use_cache(bool b) {
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203 if (b) _use_cache = _def_use_cache;
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204 else _use_cache = false;
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205 }
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206
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207 void clear_and_record_card_counts();
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208
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209 static int thread_num();
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210
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211 void print_worker_threads_on(outputStream* st) const;
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212
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213 void set_green_zone(int x) { _green_zone = x; }
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214 void set_yellow_zone(int x) { _yellow_zone = x; }
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215 void set_red_zone(int x) { _red_zone = x; }
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216
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217 int green_zone() const { return _green_zone; }
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218 int yellow_zone() const { return _yellow_zone; }
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219 int red_zone() const { return _red_zone; }
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220
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221 int total_thread_num() const { return _n_threads; }
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222 int worker_thread_num() const { return _n_worker_threads; }
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223
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224 int thread_threshold_step() const { return _thread_threshold_step; }
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225 };