Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentG1Refine.hpp @ 941:8b46c4d82093
4957990: Perm heap bloat in JVM
Summary: Treat ProfileData in MDO's as a source of weak, not strong, roots. Fixes the bug for stop-world collection -- the case of concurrent collection will be fixed separately.
Reviewed-by: jcoomes, jmasa, kvn, never
author | ysr |
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date | Wed, 02 Sep 2009 00:04:29 -0700 |
parents | 6cb8e9df7174 |
children | 035d2e036a9b |
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342 | 1 /* |
579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // Forward decl | |
26 class ConcurrentG1RefineThread; | |
27 class G1RemSet; | |
28 | |
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29 class ConcurrentG1Refine: public CHeapObj { |
794 | 30 ConcurrentG1RefineThread** _threads; |
31 int _n_threads; | |
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32 |
342 | 33 // The cache for card refinement. |
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34 bool _use_cache; |
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35 bool _def_use_cache; |
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36 |
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37 size_t _n_periods; // Used as clearing epoch |
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38 |
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39 // An evicting cache of the number of times each card |
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40 // is accessed. Reduces, but does not eliminate, the amount |
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41 // of duplicated processing of dirty cards. |
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42 |
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43 enum SomePrivateConstants { |
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44 epoch_bits = 32, |
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45 card_num_shift = epoch_bits, |
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46 epoch_mask = AllBits, |
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47 card_num_mask = AllBits, |
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48 |
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49 // The initial cache size is approximately this fraction |
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50 // of a maximal cache (i.e. the size needed for all cards |
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51 // in the heap) |
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52 InitialCacheFraction = 512 |
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53 }; |
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54 |
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55 const static julong card_num_mask_in_place = |
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56 (julong) card_num_mask << card_num_shift; |
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57 |
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58 typedef struct { |
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59 julong _value; // | card_num | epoch | |
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60 } CardEpochCacheEntry; |
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61 |
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62 julong make_epoch_entry(unsigned int card_num, unsigned int epoch) { |
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63 assert(0 <= card_num && card_num < _max_n_card_counts, "Bounds"); |
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64 assert(0 <= epoch && epoch <= _n_periods, "must be"); |
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65 |
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66 return ((julong) card_num << card_num_shift) | epoch; |
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67 } |
342 | 68 |
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69 unsigned int extract_epoch(julong v) { |
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70 return (v & epoch_mask); |
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71 } |
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72 |
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73 unsigned int extract_card_num(julong v) { |
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74 return (v & card_num_mask_in_place) >> card_num_shift; |
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75 } |
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76 |
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77 typedef struct { |
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78 unsigned char _count; |
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79 unsigned char _evict_count; |
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80 } CardCountCacheEntry; |
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81 |
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82 CardCountCacheEntry* _card_counts; |
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83 CardEpochCacheEntry* _card_epochs; |
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84 |
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85 // The current number of buckets in the card count cache |
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86 unsigned _n_card_counts; |
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87 |
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88 // The max number of buckets required for the number of |
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89 // cards for the entire reserved heap |
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90 unsigned _max_n_card_counts; |
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91 |
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92 // Possible sizes of the cache: odd primes that roughly double in size. |
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93 // (See jvmtiTagMap.cpp). |
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94 static int _cc_cache_sizes[]; |
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95 |
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96 // The index in _cc_cache_sizes corresponding to the size of |
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97 // _card_counts. |
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98 int _cache_size_index; |
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99 |
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100 bool _expand_card_counts; |
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101 |
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102 const jbyte* _ct_bot; |
889 | 103 |
104 jbyte** _hot_cache; | |
105 int _hot_cache_size; | |
106 int _n_hot; | |
107 int _hot_cache_idx; | |
108 | |
109 int _hot_cache_par_chunk_size; | |
110 volatile int _hot_cache_par_claimed_idx; | |
342 | 111 |
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112 // Needed to workaround 6817995 |
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113 CardTableModRefBS* _ct_bs; |
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114 G1CollectedHeap* _g1h; |
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115 |
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116 // Expands the array that holds the card counts to the next size up |
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117 void expand_card_count_cache(); |
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118 |
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119 // hash a given key (index of card_ptr) with the specified size |
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120 static unsigned int hash(size_t key, int size) { |
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121 return (unsigned int) key % size; |
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122 } |
342 | 123 |
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124 // hash a given key (index of card_ptr) |
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125 unsigned int hash(size_t key) { |
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126 return hash(key, _n_card_counts); |
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127 } |
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128 |
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129 unsigned ptr_2_card_num(jbyte* card_ptr) { |
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130 return (unsigned) (card_ptr - _ct_bot); |
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131 } |
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132 |
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133 jbyte* card_num_2_ptr(unsigned card_num) { |
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134 return (jbyte*) (_ct_bot + card_num); |
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135 } |
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136 |
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137 // Returns the count of this card after incrementing it. |
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138 jbyte* add_card_count(jbyte* card_ptr, int* count, bool* defer); |
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139 |
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140 // Returns true if this card is in a young region |
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141 bool is_young_card(jbyte* card_ptr); |
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142 |
342 | 143 public: |
144 ConcurrentG1Refine(); | |
145 ~ConcurrentG1Refine(); | |
146 | |
147 void init(); // Accomplish some initialization that has to wait. | |
794 | 148 void stop(); |
342 | 149 |
794 | 150 // Iterate over the conc refine threads |
151 void threads_do(ThreadClosure *tc); | |
342 | 152 |
153 // If this is the first entry for the slot, writes into the cache and | |
154 // returns NULL. If it causes an eviction, returns the evicted pointer. | |
155 // Otherwise, its a cache hit, and returns NULL. | |
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156 jbyte* cache_insert(jbyte* card_ptr, bool* defer); |
342 | 157 |
158 // Process the cached entries. | |
159 void clean_up_cache(int worker_i, G1RemSet* g1rs); | |
160 | |
889 | 161 // Set up for parallel processing of the cards in the hot cache |
162 void clear_hot_cache_claimed_index() { | |
163 _hot_cache_par_claimed_idx = 0; | |
164 } | |
165 | |
342 | 166 // Discard entries in the hot cache. |
167 void clear_hot_cache() { | |
168 _hot_cache_idx = 0; _n_hot = 0; | |
169 } | |
170 | |
171 bool hot_cache_is_empty() { return _n_hot == 0; } | |
172 | |
173 bool use_cache() { return _use_cache; } | |
174 void set_use_cache(bool b) { | |
175 if (b) _use_cache = _def_use_cache; | |
176 else _use_cache = false; | |
177 } | |
178 | |
179 void clear_and_record_card_counts(); | |
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180 |
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181 static size_t thread_num(); |
342 | 182 }; |