Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentG1Refine.hpp @ 1779:6eddcbe17c83
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Summary: Pass correct value for length to NumberSeq constructor. Guard dereferences of "body_summary" pointer with a NULL check.
Reviewed-by: tonyp, ysr
author | johnc |
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date | Mon, 13 Sep 2010 10:00:24 -0700 |
parents | 2d160770d2e5 |
children | f95d63e2154a |
rev | line source |
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342 | 1 /* |
1705 | 2 * Copyright (c) 2001, 2010, 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 | |
25 // Forward decl | |
26 class ConcurrentG1RefineThread; | |
27 class G1RemSet; | |
28 | |
549
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29 class ConcurrentG1Refine: public CHeapObj { |
794 | 30 ConcurrentG1RefineThread** _threads; |
31 int _n_threads; | |
1111 | 32 int _n_worker_threads; |
33 /* | |
34 * The value of the update buffer queue length falls into one of 3 zones: | |
35 * green, yellow, red. If the value is in [0, green) nothing is | |
36 * done, the buffers are left unprocessed to enable the caching effect of the | |
37 * dirtied cards. In the yellow zone [green, yellow) the concurrent refinement | |
38 * threads are gradually activated. In [yellow, red) all threads are | |
39 * running. If the length becomes red (max queue length) the mutators start | |
40 * processing the buffers. | |
41 * | |
1282 | 42 * There are some interesting cases (when G1UseAdaptiveConcRefinement |
43 * is turned off): | |
1111 | 44 * 1) green = yellow = red = 0. In this case the mutator will process all |
45 * buffers. Except for those that are created by the deferred updates | |
46 * machinery during a collection. | |
47 * 2) green = 0. Means no caching. Can be a good way to minimize the | |
48 * amount of time spent updating rsets during a collection. | |
49 */ | |
50 int _green_zone; | |
51 int _yellow_zone; | |
52 int _red_zone; | |
53 | |
54 int _thread_threshold_step; | |
55 | |
56 // Reset the threshold step value based of the current zone boundaries. | |
57 void reset_threshold_step(); | |
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58 |
342 | 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 } |
342 | 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; |
889 | 129 |
130 jbyte** _hot_cache; | |
131 int _hot_cache_size; | |
132 int _n_hot; | |
133 int _hot_cache_idx; | |
134 | |
135 int _hot_cache_par_chunk_size; | |
136 volatile int _hot_cache_par_claimed_idx; | |
342 | 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 } |
342 | 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 |
342 | 169 public: |
170 ConcurrentG1Refine(); | |
171 ~ConcurrentG1Refine(); | |
172 | |
173 void init(); // Accomplish some initialization that has to wait. | |
794 | 174 void stop(); |
342 | 175 |
1111 | 176 void reinitialize_threads(); |
177 | |
794 | 178 // Iterate over the conc refine threads |
179 void threads_do(ThreadClosure *tc); | |
342 | 180 |
181 // If this is the first entry for the slot, writes into the cache and | |
182 // returns NULL. If it causes an eviction, returns the evicted pointer. | |
183 // Otherwise, its a cache hit, and returns NULL. | |
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184 jbyte* cache_insert(jbyte* card_ptr, bool* defer); |
342 | 185 |
186 // Process the cached entries. | |
1705 | 187 void clean_up_cache(int worker_i, G1RemSet* g1rs, DirtyCardQueue* into_cset_dcq); |
342 | 188 |
889 | 189 // Set up for parallel processing of the cards in the hot cache |
190 void clear_hot_cache_claimed_index() { | |
191 _hot_cache_par_claimed_idx = 0; | |
192 } | |
193 | |
342 | 194 // Discard entries in the hot cache. |
195 void clear_hot_cache() { | |
196 _hot_cache_idx = 0; _n_hot = 0; | |
197 } | |
198 | |
199 bool hot_cache_is_empty() { return _n_hot == 0; } | |
200 | |
201 bool use_cache() { return _use_cache; } | |
202 void set_use_cache(bool b) { | |
203 if (b) _use_cache = _def_use_cache; | |
204 else _use_cache = false; | |
205 } | |
206 | |
207 void clear_and_record_card_counts(); | |
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208 |
1111 | 209 static int thread_num(); |
1019 | 210 |
211 void print_worker_threads_on(outputStream* st) const; | |
1111 | 212 |
213 void set_green_zone(int x) { _green_zone = x; } | |
214 void set_yellow_zone(int x) { _yellow_zone = x; } | |
215 void set_red_zone(int x) { _red_zone = x; } | |
216 | |
217 int green_zone() const { return _green_zone; } | |
218 int yellow_zone() const { return _yellow_zone; } | |
219 int red_zone() const { return _red_zone; } | |
220 | |
221 int total_thread_num() const { return _n_threads; } | |
222 int worker_thread_num() const { return _n_worker_threads; } | |
223 | |
224 int thread_threshold_step() const { return _thread_threshold_step; } | |
342 | 225 }; |