Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentG1Refine.hpp @ 8090:2af22eb04623
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author | vladidan |
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date | Thu, 21 Feb 2013 09:08:04 -0800 |
parents | b9a9ed0f8eeb |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "memory/cardTableModRefBS.hpp" | |
30 #include "runtime/thread.hpp" | |
31 #include "utilities/globalDefinitions.hpp" | |
32 | |
342 | 33 // Forward decl |
34 class ConcurrentG1RefineThread; | |
35 class G1RemSet; | |
36 | |
6197 | 37 class ConcurrentG1Refine: public CHeapObj<mtGC> { |
794 | 38 ConcurrentG1RefineThread** _threads; |
39 int _n_threads; | |
1111 | 40 int _n_worker_threads; |
41 /* | |
42 * The value of the update buffer queue length falls into one of 3 zones: | |
43 * green, yellow, red. If the value is in [0, green) nothing is | |
44 * done, the buffers are left unprocessed to enable the caching effect of the | |
45 * dirtied cards. In the yellow zone [green, yellow) the concurrent refinement | |
46 * threads are gradually activated. In [yellow, red) all threads are | |
47 * running. If the length becomes red (max queue length) the mutators start | |
48 * processing the buffers. | |
49 * | |
1282 | 50 * There are some interesting cases (when G1UseAdaptiveConcRefinement |
51 * is turned off): | |
1111 | 52 * 1) green = yellow = red = 0. In this case the mutator will process all |
53 * buffers. Except for those that are created by the deferred updates | |
54 * machinery during a collection. | |
55 * 2) green = 0. Means no caching. Can be a good way to minimize the | |
56 * amount of time spent updating rsets during a collection. | |
57 */ | |
58 int _green_zone; | |
59 int _yellow_zone; | |
60 int _red_zone; | |
61 | |
62 int _thread_threshold_step; | |
63 | |
64 // Reset the threshold step value based of the current zone boundaries. | |
65 void reset_threshold_step(); | |
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66 |
342 | 67 // The cache for card refinement. |
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68 bool _use_cache; |
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69 bool _def_use_cache; |
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70 |
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71 size_t _n_periods; // Used as clearing epoch |
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72 |
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73 // An evicting cache of the number of times each card |
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74 // is accessed. Reduces, but does not eliminate, the amount |
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75 // of duplicated processing of dirty cards. |
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76 |
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77 enum SomePrivateConstants { |
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78 epoch_bits = 32, |
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79 card_num_shift = epoch_bits, |
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80 epoch_mask = AllBits, |
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81 card_num_mask = AllBits, |
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82 |
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83 // The initial cache size is approximately this fraction |
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84 // of a maximal cache (i.e. the size needed for all cards |
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85 // in the heap) |
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86 InitialCacheFraction = 512 |
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87 }; |
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88 |
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89 const static julong card_num_mask_in_place = |
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90 (julong) card_num_mask << card_num_shift; |
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91 |
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92 typedef struct { |
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93 julong _value; // | card_num | epoch | |
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94 } CardEpochCacheEntry; |
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95 |
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96 julong make_epoch_entry(unsigned int card_num, unsigned int epoch) { |
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97 assert(0 <= card_num && card_num < _max_cards, "Bounds"); |
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98 assert(0 <= epoch && epoch <= _n_periods, "must be"); |
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99 |
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100 return ((julong) card_num << card_num_shift) | epoch; |
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101 } |
342 | 102 |
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103 unsigned int extract_epoch(julong v) { |
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104 return (v & epoch_mask); |
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105 } |
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106 |
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107 unsigned int extract_card_num(julong v) { |
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108 return (v & card_num_mask_in_place) >> card_num_shift; |
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109 } |
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110 |
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111 typedef struct { |
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112 unsigned char _count; |
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113 unsigned char _evict_count; |
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114 } CardCountCacheEntry; |
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115 |
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116 CardCountCacheEntry* _card_counts; |
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117 CardEpochCacheEntry* _card_epochs; |
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118 |
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119 // The current number of buckets in the card count cache |
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120 size_t _n_card_counts; |
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121 |
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122 // The number of cards for the entire reserved heap |
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123 size_t _max_cards; |
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124 |
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125 // The max number of buckets for the card counts and epochs caches. |
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126 // This is the maximum that the counts and epochs will grow to. |
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127 // It is specified as a fraction or percentage of _max_cards using |
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128 // G1MaxHotCardCountSizePercent. |
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129 size_t _max_n_card_counts; |
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130 |
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131 // Possible sizes of the cache: odd primes that roughly double in size. |
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132 // (See jvmtiTagMap.cpp). |
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133 enum { |
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134 MAX_CC_CACHE_INDEX = 15 // maximum index into the cache size array. |
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135 }; |
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136 |
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137 static size_t _cc_cache_sizes[MAX_CC_CACHE_INDEX]; |
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138 |
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139 // The index in _cc_cache_sizes corresponding to the size of |
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140 // _card_counts. |
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141 int _cache_size_index; |
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142 |
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143 bool _expand_card_counts; |
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144 |
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145 const jbyte* _ct_bot; |
889 | 146 |
147 jbyte** _hot_cache; | |
148 int _hot_cache_size; | |
149 int _n_hot; | |
150 int _hot_cache_idx; | |
151 | |
152 int _hot_cache_par_chunk_size; | |
153 volatile int _hot_cache_par_claimed_idx; | |
342 | 154 |
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155 // Needed to workaround 6817995 |
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156 CardTableModRefBS* _ct_bs; |
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157 G1CollectedHeap* _g1h; |
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158 |
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159 // Helper routine for expand_card_count_cache(). |
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160 // The arrays used to hold the card counts and the epochs must have |
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161 // a 1:1 correspondence. Hence they are allocated and freed together. |
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162 // Returns true if the allocations of both the counts and epochs |
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163 // were successful; false otherwise. |
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164 bool allocate_card_count_cache(size_t n, |
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165 CardCountCacheEntry** counts, |
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166 CardEpochCacheEntry** epochs); |
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167 |
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168 // Expands the arrays that hold the card counts and epochs |
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169 // to the cache size at index. Returns true if the expansion/ |
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170 // allocation was successful; false otherwise. |
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171 bool expand_card_count_cache(int index); |
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172 |
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173 // hash a given key (index of card_ptr) with the specified size |
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174 static unsigned int hash(size_t key, size_t size) { |
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175 return (unsigned int) (key % size); |
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176 } |
342 | 177 |
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178 // hash a given key (index of card_ptr) |
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179 unsigned int hash(size_t key) { |
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180 return hash(key, _n_card_counts); |
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181 } |
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182 |
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183 unsigned int ptr_2_card_num(jbyte* card_ptr) { |
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184 return (unsigned int) (card_ptr - _ct_bot); |
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185 } |
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186 |
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187 jbyte* card_num_2_ptr(unsigned int card_num) { |
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188 return (jbyte*) (_ct_bot + card_num); |
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189 } |
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190 |
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191 // Returns the count of this card after incrementing it. |
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192 jbyte* add_card_count(jbyte* card_ptr, int* count, bool* defer); |
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193 |
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194 // Returns true if this card is in a young region |
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195 bool is_young_card(jbyte* card_ptr); |
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196 |
342 | 197 public: |
198 ConcurrentG1Refine(); | |
199 ~ConcurrentG1Refine(); | |
200 | |
201 void init(); // Accomplish some initialization that has to wait. | |
794 | 202 void stop(); |
342 | 203 |
1111 | 204 void reinitialize_threads(); |
205 | |
794 | 206 // Iterate over the conc refine threads |
207 void threads_do(ThreadClosure *tc); | |
342 | 208 |
209 // If this is the first entry for the slot, writes into the cache and | |
210 // returns NULL. If it causes an eviction, returns the evicted pointer. | |
211 // Otherwise, its a cache hit, and returns NULL. | |
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212 jbyte* cache_insert(jbyte* card_ptr, bool* defer); |
342 | 213 |
214 // Process the cached entries. | |
1705 | 215 void clean_up_cache(int worker_i, G1RemSet* g1rs, DirtyCardQueue* into_cset_dcq); |
342 | 216 |
889 | 217 // Set up for parallel processing of the cards in the hot cache |
218 void clear_hot_cache_claimed_index() { | |
219 _hot_cache_par_claimed_idx = 0; | |
220 } | |
221 | |
342 | 222 // Discard entries in the hot cache. |
223 void clear_hot_cache() { | |
224 _hot_cache_idx = 0; _n_hot = 0; | |
225 } | |
226 | |
227 bool hot_cache_is_empty() { return _n_hot == 0; } | |
228 | |
229 bool use_cache() { return _use_cache; } | |
230 void set_use_cache(bool b) { | |
231 if (b) _use_cache = _def_use_cache; | |
232 else _use_cache = false; | |
233 } | |
234 | |
235 void clear_and_record_card_counts(); | |
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236 |
1111 | 237 static int thread_num(); |
1019 | 238 |
239 void print_worker_threads_on(outputStream* st) const; | |
1111 | 240 |
241 void set_green_zone(int x) { _green_zone = x; } | |
242 void set_yellow_zone(int x) { _yellow_zone = x; } | |
243 void set_red_zone(int x) { _red_zone = x; } | |
244 | |
245 int green_zone() const { return _green_zone; } | |
246 int yellow_zone() const { return _yellow_zone; } | |
247 int red_zone() const { return _red_zone; } | |
248 | |
249 int total_thread_num() const { return _n_threads; } | |
250 int worker_thread_num() const { return _n_worker_threads; } | |
251 | |
252 int thread_threshold_step() const { return _thread_threshold_step; } | |
342 | 253 }; |
1972 | 254 |
255 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP |