Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp @ 1286:ab75c83d7c37
Merge
author | johnc |
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date | Tue, 02 Mar 2010 13:57:46 -0800 |
parents | b81f3572f355 |
children | c18cbe5936b8 |
rev | line source |
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342 | 1 /* |
844 | 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 #include "incls/_precompiled.incl" | |
26 #include "incls/_concurrentG1Refine.cpp.incl" | |
27 | |
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28 // Possible sizes for the card counts cache: odd primes that roughly double in size. |
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29 // (See jvmtiTagMap.cpp). |
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30 int ConcurrentG1Refine::_cc_cache_sizes[] = { |
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31 16381, 32771, 76831, 150001, 307261, |
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32 614563, 1228891, 2457733, 4915219, 9830479, |
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33 19660831, 39321619, 78643219, 157286461, -1 |
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34 }; |
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35 |
342 | 36 ConcurrentG1Refine::ConcurrentG1Refine() : |
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37 _card_counts(NULL), _card_epochs(NULL), |
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38 _n_card_counts(0), _max_n_card_counts(0), |
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39 _cache_size_index(0), _expand_card_counts(false), |
342 | 40 _hot_cache(NULL), |
41 _def_use_cache(false), _use_cache(false), | |
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42 _n_periods(0), |
794 | 43 _threads(NULL), _n_threads(0) |
342 | 44 { |
1111 | 45 |
46 // Ergomonically select initial concurrent refinement parameters | |
1282 | 47 if (FLAG_IS_DEFAULT(G1ConcRefinementGreenZone)) { |
48 FLAG_SET_DEFAULT(G1ConcRefinementGreenZone, MAX2<int>(ParallelGCThreads, 1)); | |
1111 | 49 } |
1282 | 50 set_green_zone(G1ConcRefinementGreenZone); |
1111 | 51 |
1282 | 52 if (FLAG_IS_DEFAULT(G1ConcRefinementYellowZone)) { |
53 FLAG_SET_DEFAULT(G1ConcRefinementYellowZone, green_zone() * 3); | |
1111 | 54 } |
1282 | 55 set_yellow_zone(MAX2<int>(G1ConcRefinementYellowZone, green_zone())); |
1111 | 56 |
1282 | 57 if (FLAG_IS_DEFAULT(G1ConcRefinementRedZone)) { |
58 FLAG_SET_DEFAULT(G1ConcRefinementRedZone, yellow_zone() * 2); | |
1111 | 59 } |
1282 | 60 set_red_zone(MAX2<int>(G1ConcRefinementRedZone, yellow_zone())); |
1111 | 61 _n_worker_threads = thread_num(); |
62 // We need one extra thread to do the young gen rset size sampling. | |
63 _n_threads = _n_worker_threads + 1; | |
64 reset_threshold_step(); | |
65 | |
66 _threads = NEW_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _n_threads); | |
67 int worker_id_offset = (int)DirtyCardQueueSet::num_par_ids(); | |
68 ConcurrentG1RefineThread *next = NULL; | |
69 for (int i = _n_threads - 1; i >= 0; i--) { | |
70 ConcurrentG1RefineThread* t = new ConcurrentG1RefineThread(this, next, worker_id_offset, i); | |
71 assert(t != NULL, "Conc refine should have been created"); | |
72 assert(t->cg1r() == this, "Conc refine thread should refer to this"); | |
73 _threads[i] = t; | |
74 next = t; | |
342 | 75 } |
76 } | |
77 | |
1111 | 78 void ConcurrentG1Refine::reset_threshold_step() { |
1282 | 79 if (FLAG_IS_DEFAULT(G1ConcRefinementThresholdStep)) { |
1111 | 80 _thread_threshold_step = (yellow_zone() - green_zone()) / (worker_thread_num() + 1); |
81 } else { | |
1282 | 82 _thread_threshold_step = G1ConcRefinementThresholdStep; |
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83 } |
1111 | 84 } |
85 | |
86 int ConcurrentG1Refine::thread_num() { | |
1282 | 87 return MAX2<int>((G1ConcRefinementThreads > 0) ? G1ConcRefinementThreads : ParallelGCThreads, 1); |
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88 } |
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89 |
342 | 90 void ConcurrentG1Refine::init() { |
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91 if (G1ConcRSLogCacheSize > 0) { |
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92 _g1h = G1CollectedHeap::heap(); |
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93 _max_n_card_counts = |
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94 (unsigned) (_g1h->g1_reserved_obj_bytes() >> CardTableModRefBS::card_shift); |
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95 |
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96 size_t max_card_num = ((size_t)1 << (sizeof(unsigned)*BitsPerByte-1)) - 1; |
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97 guarantee(_max_n_card_counts < max_card_num, "card_num representation"); |
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98 |
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99 int desired = _max_n_card_counts / InitialCacheFraction; |
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100 for (_cache_size_index = 0; |
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101 _cc_cache_sizes[_cache_size_index] >= 0; _cache_size_index++) { |
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102 if (_cc_cache_sizes[_cache_size_index] >= desired) break; |
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103 } |
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104 _cache_size_index = MAX2(0, (_cache_size_index - 1)); |
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105 |
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106 int initial_size = _cc_cache_sizes[_cache_size_index]; |
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107 if (initial_size < 0) initial_size = _max_n_card_counts; |
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108 |
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109 // Make sure we don't go bigger than we will ever need |
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110 _n_card_counts = MIN2((unsigned) initial_size, _max_n_card_counts); |
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111 |
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112 _card_counts = NEW_C_HEAP_ARRAY(CardCountCacheEntry, _n_card_counts); |
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113 _card_epochs = NEW_C_HEAP_ARRAY(CardEpochCacheEntry, _n_card_counts); |
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114 |
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115 Copy::fill_to_bytes(&_card_counts[0], |
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116 _n_card_counts * sizeof(CardCountCacheEntry)); |
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117 Copy::fill_to_bytes(&_card_epochs[0], _n_card_counts * sizeof(CardEpochCacheEntry)); |
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118 |
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119 ModRefBarrierSet* bs = _g1h->mr_bs(); |
342 | 120 guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition"); |
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121 _ct_bs = (CardTableModRefBS*)bs; |
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122 _ct_bot = _ct_bs->byte_for_const(_g1h->reserved_region().start()); |
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123 |
342 | 124 _def_use_cache = true; |
125 _use_cache = true; | |
126 _hot_cache_size = (1 << G1ConcRSLogCacheSize); | |
127 _hot_cache = NEW_C_HEAP_ARRAY(jbyte*, _hot_cache_size); | |
128 _n_hot = 0; | |
129 _hot_cache_idx = 0; | |
889 | 130 |
131 // For refining the cards in the hot cache in parallel | |
132 int n_workers = (ParallelGCThreads > 0 ? | |
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133 _g1h->workers()->total_workers() : 1); |
889 | 134 _hot_cache_par_chunk_size = MAX2(1, _hot_cache_size / n_workers); |
135 _hot_cache_par_claimed_idx = 0; | |
342 | 136 } |
137 } | |
138 | |
794 | 139 void ConcurrentG1Refine::stop() { |
140 if (_threads != NULL) { | |
141 for (int i = 0; i < _n_threads; i++) { | |
142 _threads[i]->stop(); | |
143 } | |
144 } | |
145 } | |
146 | |
1111 | 147 void ConcurrentG1Refine::reinitialize_threads() { |
148 reset_threshold_step(); | |
149 if (_threads != NULL) { | |
150 for (int i = 0; i < _n_threads; i++) { | |
151 _threads[i]->initialize(); | |
152 } | |
153 } | |
154 } | |
155 | |
342 | 156 ConcurrentG1Refine::~ConcurrentG1Refine() { |
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157 if (G1ConcRSLogCacheSize > 0) { |
342 | 158 assert(_card_counts != NULL, "Logic"); |
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159 FREE_C_HEAP_ARRAY(CardCountCacheEntry, _card_counts); |
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160 assert(_card_epochs != NULL, "Logic"); |
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161 FREE_C_HEAP_ARRAY(CardEpochCacheEntry, _card_epochs); |
342 | 162 assert(_hot_cache != NULL, "Logic"); |
163 FREE_C_HEAP_ARRAY(jbyte*, _hot_cache); | |
164 } | |
794 | 165 if (_threads != NULL) { |
166 for (int i = 0; i < _n_threads; i++) { | |
167 delete _threads[i]; | |
168 } | |
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169 FREE_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _threads); |
342 | 170 } |
171 } | |
172 | |
794 | 173 void ConcurrentG1Refine::threads_do(ThreadClosure *tc) { |
174 if (_threads != NULL) { | |
175 for (int i = 0; i < _n_threads; i++) { | |
176 tc->do_thread(_threads[i]); | |
177 } | |
342 | 178 } |
179 } | |
180 | |
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181 bool ConcurrentG1Refine::is_young_card(jbyte* card_ptr) { |
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182 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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183 HeapRegion* r = _g1h->heap_region_containing(start); |
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184 if (r != NULL && r->is_young()) { |
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185 return true; |
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186 } |
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187 // This card is not associated with a heap region |
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188 // so can't be young. |
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189 return false; |
342 | 190 } |
191 | |
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192 jbyte* ConcurrentG1Refine::add_card_count(jbyte* card_ptr, int* count, bool* defer) { |
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193 unsigned new_card_num = ptr_2_card_num(card_ptr); |
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194 unsigned bucket = hash(new_card_num); |
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195 assert(0 <= bucket && bucket < _n_card_counts, "Bounds"); |
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196 |
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197 CardCountCacheEntry* count_ptr = &_card_counts[bucket]; |
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198 CardEpochCacheEntry* epoch_ptr = &_card_epochs[bucket]; |
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199 |
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200 // We have to construct a new entry if we haven't updated the counts |
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201 // during the current period, or if the count was updated for a |
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202 // different card number. |
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203 unsigned int new_epoch = (unsigned int) _n_periods; |
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204 julong new_epoch_entry = make_epoch_entry(new_card_num, new_epoch); |
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205 |
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206 while (true) { |
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207 // Fetch the previous epoch value |
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208 julong prev_epoch_entry = epoch_ptr->_value; |
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209 julong cas_res; |
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210 |
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211 if (extract_epoch(prev_epoch_entry) != new_epoch) { |
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212 // This entry has not yet been updated during this period. |
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213 // Note: we update the epoch value atomically to ensure |
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214 // that there is only one winner that updates the cached |
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215 // card_ptr value even though all the refine threads share |
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216 // the same epoch value. |
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217 |
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218 cas_res = (julong) Atomic::cmpxchg((jlong) new_epoch_entry, |
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219 (volatile jlong*)&epoch_ptr->_value, |
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220 (jlong) prev_epoch_entry); |
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221 |
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222 if (cas_res == prev_epoch_entry) { |
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223 // We have successfully won the race to update the |
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224 // epoch and card_num value. Make it look like the |
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225 // count and eviction count were previously cleared. |
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226 count_ptr->_count = 1; |
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227 count_ptr->_evict_count = 0; |
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228 *count = 0; |
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229 // We can defer the processing of card_ptr |
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230 *defer = true; |
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231 return card_ptr; |
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232 } |
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233 // We did not win the race to update the epoch field, so some other |
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234 // thread must have done it. The value that gets returned by CAS |
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235 // should be the new epoch value. |
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236 assert(extract_epoch(cas_res) == new_epoch, "unexpected epoch"); |
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237 // We could 'continue' here or just re-read the previous epoch value |
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238 prev_epoch_entry = epoch_ptr->_value; |
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239 } |
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240 |
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241 // The epoch entry for card_ptr has been updated during this period. |
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242 unsigned old_card_num = extract_card_num(prev_epoch_entry); |
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243 |
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244 // The card count that will be returned to caller |
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245 *count = count_ptr->_count; |
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246 |
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247 // Are we updating the count for the same card? |
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248 if (new_card_num == old_card_num) { |
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249 // Same card - just update the count. We could have more than one |
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250 // thread racing to update count for the current card. It should be |
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251 // OK not to use a CAS as the only penalty should be some missed |
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252 // increments of the count which delays identifying the card as "hot". |
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253 |
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254 if (*count < max_jubyte) count_ptr->_count++; |
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255 // We can defer the processing of card_ptr |
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256 *defer = true; |
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257 return card_ptr; |
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258 } |
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259 |
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260 // Different card - evict old card info |
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261 if (count_ptr->_evict_count < max_jubyte) count_ptr->_evict_count++; |
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262 if (count_ptr->_evict_count > G1CardCountCacheExpandThreshold) { |
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263 // Trigger a resize the next time we clear |
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264 _expand_card_counts = true; |
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265 } |
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266 |
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267 cas_res = (julong) Atomic::cmpxchg((jlong) new_epoch_entry, |
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268 (volatile jlong*)&epoch_ptr->_value, |
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269 (jlong) prev_epoch_entry); |
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270 |
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271 if (cas_res == prev_epoch_entry) { |
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272 // We successfully updated the card num value in the epoch entry |
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273 count_ptr->_count = 0; // initialize counter for new card num |
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274 |
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275 // Even though the region containg the card at old_card_num was not |
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276 // in the young list when old_card_num was recorded in the epoch |
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277 // cache it could have been added to the free list and subsequently |
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278 // added to the young list in the intervening time. If the evicted |
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279 // card is in a young region just return the card_ptr and the evicted |
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280 // card will not be cleaned. See CR 6817995. |
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281 |
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282 jbyte* old_card_ptr = card_num_2_ptr(old_card_num); |
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283 if (is_young_card(old_card_ptr)) { |
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284 *count = 0; |
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285 // We can defer the processing of card_ptr |
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286 *defer = true; |
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287 return card_ptr; |
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288 } |
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289 |
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290 // We do not want to defer processing of card_ptr in this case |
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291 // (we need to refine old_card_ptr and card_ptr) |
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292 *defer = false; |
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293 return old_card_ptr; |
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294 } |
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295 // Someone else beat us - try again. |
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296 } |
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297 } |
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298 |
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299 jbyte* ConcurrentG1Refine::cache_insert(jbyte* card_ptr, bool* defer) { |
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300 int count; |
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301 jbyte* cached_ptr = add_card_count(card_ptr, &count, defer); |
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302 assert(cached_ptr != NULL, "bad cached card ptr"); |
1246
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303 |
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304 if (is_young_card(cached_ptr)) { |
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305 // The region containing cached_ptr has been freed during a clean up |
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306 // pause, reallocated, and tagged as young. |
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307 assert(cached_ptr != card_ptr, "shouldn't be"); |
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|
308 |
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309 // We've just inserted a new old-gen card pointer into the card count |
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310 // cache and evicted the previous contents of that count slot. |
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311 // The evicted card pointer has been determined to be in a young region |
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312 // and so cannot be the newly inserted card pointer (that will be |
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313 // in an old region). |
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314 // The count for newly inserted card will be set to zero during the |
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315 // insertion, so we don't want to defer the cleaning of the newly |
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316 // inserted card pointer. |
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317 assert(*defer == false, "deferring non-hot card"); |
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318 return NULL; |
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|
319 } |
890
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320 |
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321 // The card pointer we obtained from card count cache is not hot |
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322 // so do not store it in the cache; return it for immediate |
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323 // refining. |
342 | 324 if (count < G1ConcRSHotCardLimit) { |
890
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325 return cached_ptr; |
342 | 326 } |
890
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327 |
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328 // Otherwise, the pointer we got from the _card_counts is hot. |
342 | 329 jbyte* res = NULL; |
330 MutexLockerEx x(HotCardCache_lock, Mutex::_no_safepoint_check_flag); | |
331 if (_n_hot == _hot_cache_size) { | |
332 res = _hot_cache[_hot_cache_idx]; | |
333 _n_hot--; | |
334 } | |
335 // Now _n_hot < _hot_cache_size, and we can insert at _hot_cache_idx. | |
890
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336 _hot_cache[_hot_cache_idx] = cached_ptr; |
342 | 337 _hot_cache_idx++; |
338 if (_hot_cache_idx == _hot_cache_size) _hot_cache_idx = 0; | |
339 _n_hot++; | |
890
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340 |
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341 if (res != NULL) { |
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342 // Even though the region containg res was not in the young list |
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343 // when it was recorded in the hot cache it could have been added |
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344 // to the free list and subsequently added to the young list in |
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345 // the intervening time. If res is in a young region, return NULL |
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346 // so that res is not cleaned. See CR 6817995. |
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|
347 |
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|
348 if (is_young_card(res)) { |
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349 res = NULL; |
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|
350 } |
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|
351 } |
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352 |
342 | 353 return res; |
354 } | |
355 | |
356 void ConcurrentG1Refine::clean_up_cache(int worker_i, G1RemSet* g1rs) { | |
357 assert(!use_cache(), "cache should be disabled"); | |
889 | 358 int start_idx; |
359 | |
360 while ((start_idx = _hot_cache_par_claimed_idx) < _n_hot) { // read once | |
361 int end_idx = start_idx + _hot_cache_par_chunk_size; | |
362 | |
363 if (start_idx == | |
364 Atomic::cmpxchg(end_idx, &_hot_cache_par_claimed_idx, start_idx)) { | |
365 // The current worker has successfully claimed the chunk [start_idx..end_idx) | |
366 end_idx = MIN2(end_idx, _n_hot); | |
367 for (int i = start_idx; i < end_idx; i++) { | |
368 jbyte* entry = _hot_cache[i]; | |
369 if (entry != NULL) { | |
370 g1rs->concurrentRefineOneCard(entry, worker_i); | |
371 } | |
372 } | |
342 | 373 } |
374 } | |
375 } | |
376 | |
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377 void ConcurrentG1Refine::expand_card_count_cache() { |
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378 if (_n_card_counts < _max_n_card_counts) { |
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379 int new_idx = _cache_size_index+1; |
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380 int new_size = _cc_cache_sizes[new_idx]; |
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381 if (new_size < 0) new_size = _max_n_card_counts; |
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382 |
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383 // Make sure we don't go bigger than we will ever need |
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384 new_size = MIN2((unsigned) new_size, _max_n_card_counts); |
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385 |
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386 // Expand the card count and card epoch tables |
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387 if (new_size > (int)_n_card_counts) { |
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388 // We can just free and allocate a new array as we're |
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389 // not interested in preserving the contents |
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390 assert(_card_counts != NULL, "Logic!"); |
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391 assert(_card_epochs != NULL, "Logic!"); |
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392 FREE_C_HEAP_ARRAY(CardCountCacheEntry, _card_counts); |
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393 FREE_C_HEAP_ARRAY(CardEpochCacheEntry, _card_epochs); |
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394 _n_card_counts = new_size; |
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395 _card_counts = NEW_C_HEAP_ARRAY(CardCountCacheEntry, _n_card_counts); |
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396 _card_epochs = NEW_C_HEAP_ARRAY(CardEpochCacheEntry, _n_card_counts); |
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397 _cache_size_index = new_idx; |
342 | 398 } |
399 } | |
400 } | |
401 | |
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402 void ConcurrentG1Refine::clear_and_record_card_counts() { |
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403 if (G1ConcRSLogCacheSize == 0) return; |
342 | 404 |
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405 #ifndef PRODUCT |
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406 double start = os::elapsedTime(); |
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407 #endif |
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408 |
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409 if (_expand_card_counts) { |
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410 expand_card_count_cache(); |
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411 _expand_card_counts = false; |
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412 // Only need to clear the epochs. |
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413 Copy::fill_to_bytes(&_card_epochs[0], _n_card_counts * sizeof(CardEpochCacheEntry)); |
342 | 414 } |
415 | |
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416 int this_epoch = (int) _n_periods; |
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417 assert((this_epoch+1) <= max_jint, "to many periods"); |
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418 // Update epoch |
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419 _n_periods++; |
342 | 420 |
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421 #ifndef PRODUCT |
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422 double elapsed = os::elapsedTime() - start; |
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423 _g1h->g1_policy()->record_cc_clear_time(elapsed * 1000.0); |
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424 #endif |
342 | 425 } |
1019 | 426 |
427 void ConcurrentG1Refine::print_worker_threads_on(outputStream* st) const { | |
428 for (int i = 0; i < _n_threads; ++i) { | |
429 _threads[i]->print_on(st); | |
430 st->cr(); | |
431 } | |
432 } |