Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp @ 2403:1927db75dd85
7024475: loop doesn't terminate when compiled
Reviewed-by: kvn
author | never |
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date | Sun, 27 Mar 2011 00:00:14 -0700 |
parents | 04d1138b4cce |
children | 02f49b66361a |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, 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 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
29 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
30 #include "gc_implementation/g1/g1RemSet.hpp" | |
31 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
32 #include "memory/space.inline.hpp" | |
33 #include "runtime/atomic.hpp" | |
34 #include "utilities/copy.hpp" | |
342 | 35 |
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36 // Possible sizes for the card counts cache: odd primes that roughly double in size. |
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37 // (See jvmtiTagMap.cpp). |
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38 int ConcurrentG1Refine::_cc_cache_sizes[] = { |
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39 16381, 32771, 76831, 150001, 307261, |
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40 614563, 1228891, 2457733, 4915219, 9830479, |
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41 19660831, 39321619, 78643219, 157286461, -1 |
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42 }; |
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43 |
342 | 44 ConcurrentG1Refine::ConcurrentG1Refine() : |
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45 _card_counts(NULL), _card_epochs(NULL), |
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46 _n_card_counts(0), _max_n_card_counts(0), |
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47 _cache_size_index(0), _expand_card_counts(false), |
342 | 48 _hot_cache(NULL), |
49 _def_use_cache(false), _use_cache(false), | |
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50 _n_periods(0), |
794 | 51 _threads(NULL), _n_threads(0) |
342 | 52 { |
1111 | 53 |
54 // Ergomonically select initial concurrent refinement parameters | |
1282 | 55 if (FLAG_IS_DEFAULT(G1ConcRefinementGreenZone)) { |
56 FLAG_SET_DEFAULT(G1ConcRefinementGreenZone, MAX2<int>(ParallelGCThreads, 1)); | |
1111 | 57 } |
1282 | 58 set_green_zone(G1ConcRefinementGreenZone); |
1111 | 59 |
1282 | 60 if (FLAG_IS_DEFAULT(G1ConcRefinementYellowZone)) { |
61 FLAG_SET_DEFAULT(G1ConcRefinementYellowZone, green_zone() * 3); | |
1111 | 62 } |
1282 | 63 set_yellow_zone(MAX2<int>(G1ConcRefinementYellowZone, green_zone())); |
1111 | 64 |
1282 | 65 if (FLAG_IS_DEFAULT(G1ConcRefinementRedZone)) { |
66 FLAG_SET_DEFAULT(G1ConcRefinementRedZone, yellow_zone() * 2); | |
1111 | 67 } |
1282 | 68 set_red_zone(MAX2<int>(G1ConcRefinementRedZone, yellow_zone())); |
1111 | 69 _n_worker_threads = thread_num(); |
70 // We need one extra thread to do the young gen rset size sampling. | |
71 _n_threads = _n_worker_threads + 1; | |
72 reset_threshold_step(); | |
73 | |
74 _threads = NEW_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _n_threads); | |
75 int worker_id_offset = (int)DirtyCardQueueSet::num_par_ids(); | |
76 ConcurrentG1RefineThread *next = NULL; | |
77 for (int i = _n_threads - 1; i >= 0; i--) { | |
78 ConcurrentG1RefineThread* t = new ConcurrentG1RefineThread(this, next, worker_id_offset, i); | |
79 assert(t != NULL, "Conc refine should have been created"); | |
80 assert(t->cg1r() == this, "Conc refine thread should refer to this"); | |
81 _threads[i] = t; | |
82 next = t; | |
342 | 83 } |
84 } | |
85 | |
1111 | 86 void ConcurrentG1Refine::reset_threshold_step() { |
1282 | 87 if (FLAG_IS_DEFAULT(G1ConcRefinementThresholdStep)) { |
1111 | 88 _thread_threshold_step = (yellow_zone() - green_zone()) / (worker_thread_num() + 1); |
89 } else { | |
1282 | 90 _thread_threshold_step = G1ConcRefinementThresholdStep; |
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91 } |
1111 | 92 } |
93 | |
94 int ConcurrentG1Refine::thread_num() { | |
1282 | 95 return MAX2<int>((G1ConcRefinementThreads > 0) ? G1ConcRefinementThreads : ParallelGCThreads, 1); |
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96 } |
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97 |
342 | 98 void ConcurrentG1Refine::init() { |
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99 if (G1ConcRSLogCacheSize > 0) { |
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100 _g1h = G1CollectedHeap::heap(); |
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101 _max_n_card_counts = |
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102 (unsigned) (_g1h->max_capacity() >> CardTableModRefBS::card_shift); |
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103 |
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104 size_t max_card_num = ((size_t)1 << (sizeof(unsigned)*BitsPerByte-1)) - 1; |
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105 guarantee(_max_n_card_counts < max_card_num, "card_num representation"); |
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106 |
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107 int desired = _max_n_card_counts / InitialCacheFraction; |
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108 for (_cache_size_index = 0; |
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109 _cc_cache_sizes[_cache_size_index] >= 0; _cache_size_index++) { |
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110 if (_cc_cache_sizes[_cache_size_index] >= desired) break; |
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111 } |
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112 _cache_size_index = MAX2(0, (_cache_size_index - 1)); |
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113 |
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114 int initial_size = _cc_cache_sizes[_cache_size_index]; |
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115 if (initial_size < 0) initial_size = _max_n_card_counts; |
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116 |
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117 // Make sure we don't go bigger than we will ever need |
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118 _n_card_counts = MIN2((unsigned) initial_size, _max_n_card_counts); |
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119 |
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120 _card_counts = NEW_C_HEAP_ARRAY(CardCountCacheEntry, _n_card_counts); |
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121 _card_epochs = NEW_C_HEAP_ARRAY(CardEpochCacheEntry, _n_card_counts); |
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122 |
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123 Copy::fill_to_bytes(&_card_counts[0], |
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124 _n_card_counts * sizeof(CardCountCacheEntry)); |
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125 Copy::fill_to_bytes(&_card_epochs[0], _n_card_counts * sizeof(CardEpochCacheEntry)); |
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126 |
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127 ModRefBarrierSet* bs = _g1h->mr_bs(); |
342 | 128 guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition"); |
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129 _ct_bs = (CardTableModRefBS*)bs; |
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130 _ct_bot = _ct_bs->byte_for_const(_g1h->reserved_region().start()); |
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131 |
342 | 132 _def_use_cache = true; |
133 _use_cache = true; | |
134 _hot_cache_size = (1 << G1ConcRSLogCacheSize); | |
135 _hot_cache = NEW_C_HEAP_ARRAY(jbyte*, _hot_cache_size); | |
136 _n_hot = 0; | |
137 _hot_cache_idx = 0; | |
889 | 138 |
139 // For refining the cards in the hot cache in parallel | |
140 int n_workers = (ParallelGCThreads > 0 ? | |
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141 _g1h->workers()->total_workers() : 1); |
889 | 142 _hot_cache_par_chunk_size = MAX2(1, _hot_cache_size / n_workers); |
143 _hot_cache_par_claimed_idx = 0; | |
342 | 144 } |
145 } | |
146 | |
794 | 147 void ConcurrentG1Refine::stop() { |
148 if (_threads != NULL) { | |
149 for (int i = 0; i < _n_threads; i++) { | |
150 _threads[i]->stop(); | |
151 } | |
152 } | |
153 } | |
154 | |
1111 | 155 void ConcurrentG1Refine::reinitialize_threads() { |
156 reset_threshold_step(); | |
157 if (_threads != NULL) { | |
158 for (int i = 0; i < _n_threads; i++) { | |
159 _threads[i]->initialize(); | |
160 } | |
161 } | |
162 } | |
163 | |
342 | 164 ConcurrentG1Refine::~ConcurrentG1Refine() { |
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165 if (G1ConcRSLogCacheSize > 0) { |
342 | 166 assert(_card_counts != NULL, "Logic"); |
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167 FREE_C_HEAP_ARRAY(CardCountCacheEntry, _card_counts); |
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168 assert(_card_epochs != NULL, "Logic"); |
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169 FREE_C_HEAP_ARRAY(CardEpochCacheEntry, _card_epochs); |
342 | 170 assert(_hot_cache != NULL, "Logic"); |
171 FREE_C_HEAP_ARRAY(jbyte*, _hot_cache); | |
172 } | |
794 | 173 if (_threads != NULL) { |
174 for (int i = 0; i < _n_threads; i++) { | |
175 delete _threads[i]; | |
176 } | |
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177 FREE_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _threads); |
342 | 178 } |
179 } | |
180 | |
794 | 181 void ConcurrentG1Refine::threads_do(ThreadClosure *tc) { |
182 if (_threads != NULL) { | |
183 for (int i = 0; i < _n_threads; i++) { | |
184 tc->do_thread(_threads[i]); | |
185 } | |
342 | 186 } |
187 } | |
188 | |
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189 bool ConcurrentG1Refine::is_young_card(jbyte* card_ptr) { |
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190 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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191 HeapRegion* r = _g1h->heap_region_containing(start); |
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192 if (r != NULL && r->is_young()) { |
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193 return true; |
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194 } |
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195 // This card is not associated with a heap region |
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196 // so can't be young. |
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197 return false; |
342 | 198 } |
199 | |
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200 jbyte* ConcurrentG1Refine::add_card_count(jbyte* card_ptr, int* count, bool* defer) { |
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201 unsigned new_card_num = ptr_2_card_num(card_ptr); |
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202 unsigned bucket = hash(new_card_num); |
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203 assert(0 <= bucket && bucket < _n_card_counts, "Bounds"); |
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204 |
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205 CardCountCacheEntry* count_ptr = &_card_counts[bucket]; |
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206 CardEpochCacheEntry* epoch_ptr = &_card_epochs[bucket]; |
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207 |
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208 // We have to construct a new entry if we haven't updated the counts |
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209 // during the current period, or if the count was updated for a |
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210 // different card number. |
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211 unsigned int new_epoch = (unsigned int) _n_periods; |
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212 julong new_epoch_entry = make_epoch_entry(new_card_num, new_epoch); |
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213 |
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214 while (true) { |
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215 // Fetch the previous epoch value |
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216 julong prev_epoch_entry = epoch_ptr->_value; |
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217 julong cas_res; |
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218 |
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219 if (extract_epoch(prev_epoch_entry) != new_epoch) { |
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220 // This entry has not yet been updated during this period. |
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221 // Note: we update the epoch value atomically to ensure |
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222 // that there is only one winner that updates the cached |
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223 // card_ptr value even though all the refine threads share |
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224 // the same epoch value. |
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225 |
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226 cas_res = (julong) Atomic::cmpxchg((jlong) new_epoch_entry, |
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227 (volatile jlong*)&epoch_ptr->_value, |
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228 (jlong) prev_epoch_entry); |
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229 |
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230 if (cas_res == prev_epoch_entry) { |
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231 // We have successfully won the race to update the |
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232 // epoch and card_num value. Make it look like the |
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233 // count and eviction count were previously cleared. |
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234 count_ptr->_count = 1; |
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235 count_ptr->_evict_count = 0; |
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236 *count = 0; |
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237 // We can defer the processing of card_ptr |
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238 *defer = true; |
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239 return card_ptr; |
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240 } |
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241 // We did not win the race to update the epoch field, so some other |
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242 // thread must have done it. The value that gets returned by CAS |
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243 // should be the new epoch value. |
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244 assert(extract_epoch(cas_res) == new_epoch, "unexpected epoch"); |
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245 // We could 'continue' here or just re-read the previous epoch value |
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246 prev_epoch_entry = epoch_ptr->_value; |
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247 } |
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248 |
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249 // The epoch entry for card_ptr has been updated during this period. |
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250 unsigned old_card_num = extract_card_num(prev_epoch_entry); |
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251 |
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252 // The card count that will be returned to caller |
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253 *count = count_ptr->_count; |
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254 |
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255 // Are we updating the count for the same card? |
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256 if (new_card_num == old_card_num) { |
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257 // Same card - just update the count. We could have more than one |
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258 // thread racing to update count for the current card. It should be |
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259 // OK not to use a CAS as the only penalty should be some missed |
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260 // increments of the count which delays identifying the card as "hot". |
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261 |
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262 if (*count < max_jubyte) count_ptr->_count++; |
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263 // We can defer the processing of card_ptr |
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264 *defer = true; |
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265 return card_ptr; |
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266 } |
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267 |
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268 // Different card - evict old card info |
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269 if (count_ptr->_evict_count < max_jubyte) count_ptr->_evict_count++; |
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270 if (count_ptr->_evict_count > G1CardCountCacheExpandThreshold) { |
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271 // Trigger a resize the next time we clear |
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272 _expand_card_counts = true; |
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273 } |
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274 |
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275 cas_res = (julong) Atomic::cmpxchg((jlong) new_epoch_entry, |
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276 (volatile jlong*)&epoch_ptr->_value, |
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277 (jlong) prev_epoch_entry); |
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278 |
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279 if (cas_res == prev_epoch_entry) { |
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280 // We successfully updated the card num value in the epoch entry |
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281 count_ptr->_count = 0; // initialize counter for new card num |
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282 jbyte* old_card_ptr = card_num_2_ptr(old_card_num); |
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283 |
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284 // Even though the region containg the card at old_card_num was not |
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285 // in the young list when old_card_num was recorded in the epoch |
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286 // cache it could have been added to the free list and subsequently |
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287 // added to the young list in the intervening time. See CR 6817995. |
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288 // We do not deal with this case here - it will be handled in |
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289 // HeapRegion::oops_on_card_seq_iterate_careful after it has been |
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290 // determined that the region containing the card has been allocated |
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291 // to, and it's safe to check the young type of the region. |
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292 |
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293 // We do not want to defer processing of card_ptr in this case |
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294 // (we need to refine old_card_ptr and card_ptr) |
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295 *defer = false; |
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296 return old_card_ptr; |
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297 } |
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298 // Someone else beat us - try again. |
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299 } |
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300 } |
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301 |
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302 jbyte* ConcurrentG1Refine::cache_insert(jbyte* card_ptr, bool* defer) { |
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303 int count; |
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304 jbyte* cached_ptr = add_card_count(card_ptr, &count, defer); |
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305 assert(cached_ptr != NULL, "bad cached card ptr"); |
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306 |
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307 // We've just inserted a card pointer into the card count cache |
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308 // and got back the card that we just inserted or (evicted) the |
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309 // previous contents of that count slot. |
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310 |
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311 // The card we got back could be in a young region. When the |
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312 // returned card (if evicted) was originally inserted, we had |
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313 // determined that its containing region was not young. However |
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314 // it is possible for the region to be freed during a cleanup |
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315 // pause, then reallocated and tagged as young which will result |
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316 // in the returned card residing in a young region. |
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317 // |
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318 // We do not deal with this case here - the change from non-young |
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319 // to young could be observed at any time - it will be handled in |
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320 // HeapRegion::oops_on_card_seq_iterate_careful after it has been |
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321 // determined that the region containing the card has been allocated |
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322 // to. |
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323 |
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324 // The card pointer we obtained from card count cache is not hot |
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325 // so do not store it in the cache; return it for immediate |
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326 // refining. |
342 | 327 if (count < G1ConcRSHotCardLimit) { |
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328 return cached_ptr; |
342 | 329 } |
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330 |
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331 // Otherwise, the pointer we got from the _card_counts cache is hot. |
342 | 332 jbyte* res = NULL; |
333 MutexLockerEx x(HotCardCache_lock, Mutex::_no_safepoint_check_flag); | |
334 if (_n_hot == _hot_cache_size) { | |
335 res = _hot_cache[_hot_cache_idx]; | |
336 _n_hot--; | |
337 } | |
338 // Now _n_hot < _hot_cache_size, and we can insert at _hot_cache_idx. | |
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339 _hot_cache[_hot_cache_idx] = cached_ptr; |
342 | 340 _hot_cache_idx++; |
341 if (_hot_cache_idx == _hot_cache_size) _hot_cache_idx = 0; | |
342 _n_hot++; | |
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343 |
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344 // The card obtained from the hot card cache could be in a young |
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345 // region. See above on how this can happen. |
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346 |
342 | 347 return res; |
348 } | |
349 | |
1705 | 350 void ConcurrentG1Refine::clean_up_cache(int worker_i, |
351 G1RemSet* g1rs, | |
352 DirtyCardQueue* into_cset_dcq) { | |
342 | 353 assert(!use_cache(), "cache should be disabled"); |
889 | 354 int start_idx; |
355 | |
356 while ((start_idx = _hot_cache_par_claimed_idx) < _n_hot) { // read once | |
357 int end_idx = start_idx + _hot_cache_par_chunk_size; | |
358 | |
359 if (start_idx == | |
360 Atomic::cmpxchg(end_idx, &_hot_cache_par_claimed_idx, start_idx)) { | |
361 // The current worker has successfully claimed the chunk [start_idx..end_idx) | |
362 end_idx = MIN2(end_idx, _n_hot); | |
363 for (int i = start_idx; i < end_idx; i++) { | |
364 jbyte* entry = _hot_cache[i]; | |
365 if (entry != NULL) { | |
1705 | 366 if (g1rs->concurrentRefineOneCard(entry, worker_i, true)) { |
367 // 'entry' contains references that point into the current | |
368 // collection set. We need to record 'entry' in the DCQS | |
369 // that's used for that purpose. | |
370 // | |
371 // The only time we care about recording cards that contain | |
372 // references that point into the collection set is during | |
373 // RSet updating while within an evacuation pause. | |
374 // In this case worker_i should be the id of a GC worker thread | |
375 assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause"); | |
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376 assert(worker_i < (int) (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), "incorrect worker id"); |
1705 | 377 into_cset_dcq->enqueue(entry); |
378 } | |
889 | 379 } |
380 } | |
342 | 381 } |
382 } | |
383 } | |
384 | |
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385 void ConcurrentG1Refine::expand_card_count_cache() { |
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386 if (_n_card_counts < _max_n_card_counts) { |
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387 int new_idx = _cache_size_index+1; |
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388 int new_size = _cc_cache_sizes[new_idx]; |
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389 if (new_size < 0) new_size = _max_n_card_counts; |
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390 |
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391 // Make sure we don't go bigger than we will ever need |
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392 new_size = MIN2((unsigned) new_size, _max_n_card_counts); |
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393 |
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394 // Expand the card count and card epoch tables |
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395 if (new_size > (int)_n_card_counts) { |
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396 // We can just free and allocate a new array as we're |
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397 // not interested in preserving the contents |
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398 assert(_card_counts != NULL, "Logic!"); |
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399 assert(_card_epochs != NULL, "Logic!"); |
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400 FREE_C_HEAP_ARRAY(CardCountCacheEntry, _card_counts); |
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401 FREE_C_HEAP_ARRAY(CardEpochCacheEntry, _card_epochs); |
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402 _n_card_counts = new_size; |
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403 _card_counts = NEW_C_HEAP_ARRAY(CardCountCacheEntry, _n_card_counts); |
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404 _card_epochs = NEW_C_HEAP_ARRAY(CardEpochCacheEntry, _n_card_counts); |
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405 _cache_size_index = new_idx; |
342 | 406 } |
407 } | |
408 } | |
409 | |
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410 void ConcurrentG1Refine::clear_and_record_card_counts() { |
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411 if (G1ConcRSLogCacheSize == 0) return; |
342 | 412 |
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413 #ifndef PRODUCT |
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414 double start = os::elapsedTime(); |
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415 #endif |
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416 |
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417 if (_expand_card_counts) { |
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418 expand_card_count_cache(); |
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419 _expand_card_counts = false; |
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420 // Only need to clear the epochs. |
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421 Copy::fill_to_bytes(&_card_epochs[0], _n_card_counts * sizeof(CardEpochCacheEntry)); |
342 | 422 } |
423 | |
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424 int this_epoch = (int) _n_periods; |
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425 assert((this_epoch+1) <= max_jint, "to many periods"); |
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426 // Update epoch |
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427 _n_periods++; |
342 | 428 |
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429 #ifndef PRODUCT |
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430 double elapsed = os::elapsedTime() - start; |
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431 _g1h->g1_policy()->record_cc_clear_time(elapsed * 1000.0); |
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432 #endif |
342 | 433 } |
1019 | 434 |
435 void ConcurrentG1Refine::print_worker_threads_on(outputStream* st) const { | |
436 for (int i = 0; i < _n_threads; ++i) { | |
437 _threads[i]->print_on(st); | |
438 st->cr(); | |
439 } | |
440 } |