Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp @ 8090:2af22eb04623
Merge
author | vladidan |
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date | Thu, 21 Feb 2013 09:08:04 -0800 |
parents | 3a431b605145 |
children | 194f52aa2f23 |
rev | line source |
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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 #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" | |
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30 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" |
1972 | 31 #include "gc_implementation/g1/g1RemSet.hpp" |
32 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
33 #include "memory/space.inline.hpp" | |
34 #include "runtime/atomic.hpp" | |
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35 #include "runtime/java.hpp" |
1972 | 36 #include "utilities/copy.hpp" |
342 | 37 |
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38 // Possible sizes for the card counts cache: odd primes that roughly double in size. |
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39 // (See jvmtiTagMap.cpp). |
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40 |
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41 #define MAX_SIZE ((size_t) -1) |
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42 |
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43 size_t ConcurrentG1Refine::_cc_cache_sizes[] = { |
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44 16381, 32771, 76831, 150001, 307261, |
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45 614563, 1228891, 2457733, 4915219, 9830479, |
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46 19660831, 39321619, 78643219, 157286461, MAX_SIZE |
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47 }; |
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48 |
342 | 49 ConcurrentG1Refine::ConcurrentG1Refine() : |
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50 _card_counts(NULL), _card_epochs(NULL), |
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51 _n_card_counts(0), _max_cards(0), _max_n_card_counts(0), |
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52 _cache_size_index(0), _expand_card_counts(false), |
342 | 53 _hot_cache(NULL), |
54 _def_use_cache(false), _use_cache(false), | |
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55 // We initialize the epochs of the array to 0. By initializing |
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56 // _n_periods to 1 and not 0 we automatically invalidate all the |
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57 // entries on the array. Otherwise we might accidentally think that |
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58 // we claimed a card that was in fact never set (see CR7033292). |
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59 _n_periods(1), |
794 | 60 _threads(NULL), _n_threads(0) |
342 | 61 { |
1111 | 62 |
63 // Ergomonically select initial concurrent refinement parameters | |
1282 | 64 if (FLAG_IS_DEFAULT(G1ConcRefinementGreenZone)) { |
65 FLAG_SET_DEFAULT(G1ConcRefinementGreenZone, MAX2<int>(ParallelGCThreads, 1)); | |
1111 | 66 } |
1282 | 67 set_green_zone(G1ConcRefinementGreenZone); |
1111 | 68 |
1282 | 69 if (FLAG_IS_DEFAULT(G1ConcRefinementYellowZone)) { |
70 FLAG_SET_DEFAULT(G1ConcRefinementYellowZone, green_zone() * 3); | |
1111 | 71 } |
1282 | 72 set_yellow_zone(MAX2<int>(G1ConcRefinementYellowZone, green_zone())); |
1111 | 73 |
1282 | 74 if (FLAG_IS_DEFAULT(G1ConcRefinementRedZone)) { |
75 FLAG_SET_DEFAULT(G1ConcRefinementRedZone, yellow_zone() * 2); | |
1111 | 76 } |
1282 | 77 set_red_zone(MAX2<int>(G1ConcRefinementRedZone, yellow_zone())); |
1111 | 78 _n_worker_threads = thread_num(); |
79 // We need one extra thread to do the young gen rset size sampling. | |
80 _n_threads = _n_worker_threads + 1; | |
81 reset_threshold_step(); | |
82 | |
6197 | 83 _threads = NEW_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _n_threads, mtGC); |
1111 | 84 int worker_id_offset = (int)DirtyCardQueueSet::num_par_ids(); |
85 ConcurrentG1RefineThread *next = NULL; | |
86 for (int i = _n_threads - 1; i >= 0; i--) { | |
87 ConcurrentG1RefineThread* t = new ConcurrentG1RefineThread(this, next, worker_id_offset, i); | |
88 assert(t != NULL, "Conc refine should have been created"); | |
89 assert(t->cg1r() == this, "Conc refine thread should refer to this"); | |
90 _threads[i] = t; | |
91 next = t; | |
342 | 92 } |
93 } | |
94 | |
1111 | 95 void ConcurrentG1Refine::reset_threshold_step() { |
1282 | 96 if (FLAG_IS_DEFAULT(G1ConcRefinementThresholdStep)) { |
1111 | 97 _thread_threshold_step = (yellow_zone() - green_zone()) / (worker_thread_num() + 1); |
98 } else { | |
1282 | 99 _thread_threshold_step = G1ConcRefinementThresholdStep; |
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100 } |
1111 | 101 } |
102 | |
103 int ConcurrentG1Refine::thread_num() { | |
1282 | 104 return MAX2<int>((G1ConcRefinementThreads > 0) ? G1ConcRefinementThreads : ParallelGCThreads, 1); |
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105 } |
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106 |
342 | 107 void ConcurrentG1Refine::init() { |
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108 if (G1ConcRSLogCacheSize > 0) { |
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109 _g1h = G1CollectedHeap::heap(); |
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110 |
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111 _max_cards = _g1h->max_capacity() >> CardTableModRefBS::card_shift; |
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112 _max_n_card_counts = _max_cards * G1MaxHotCardCountSizePercent / 100; |
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113 |
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114 size_t max_card_num = ((size_t)1 << (sizeof(unsigned)*BitsPerByte-1)) - 1; |
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115 guarantee(_max_cards < max_card_num, "card_num representation"); |
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116 |
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117 // We need _n_card_counts to be less than _max_n_card_counts here |
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118 // so that the expansion call (below) actually allocates the |
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119 // _counts and _epochs arrays. |
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120 assert(_n_card_counts == 0, "pre-condition"); |
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121 assert(_max_n_card_counts > 0, "pre-condition"); |
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122 |
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123 // Find the index into cache size array that is of a size that's |
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124 // large enough to hold desired_sz. |
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125 size_t desired_sz = _max_cards / InitialCacheFraction; |
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126 int desired_sz_index = 0; |
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127 while (_cc_cache_sizes[desired_sz_index] < desired_sz) { |
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128 desired_sz_index += 1; |
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129 assert(desired_sz_index < MAX_CC_CACHE_INDEX, "invariant"); |
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130 } |
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131 assert(desired_sz_index < MAX_CC_CACHE_INDEX, "invariant"); |
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132 |
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133 // If the desired_sz value is between two sizes then |
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134 // _cc_cache_sizes[desired_sz_index-1] < desired_sz <= _cc_cache_sizes[desired_sz_index] |
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135 // we will start with the lower size in the optimistic expectation that |
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136 // we will not need to expand up. Note desired_sz_index could also be 0. |
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137 if (desired_sz_index > 0 && |
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138 _cc_cache_sizes[desired_sz_index] > desired_sz) { |
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139 desired_sz_index -= 1; |
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140 } |
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141 |
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142 if (!expand_card_count_cache(desired_sz_index)) { |
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143 // Allocation was unsuccessful - exit |
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144 vm_exit_during_initialization("Could not reserve enough space for card count cache"); |
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145 } |
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146 assert(_n_card_counts > 0, "post-condition"); |
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147 assert(_cache_size_index == desired_sz_index, "post-condition"); |
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148 |
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149 Copy::fill_to_bytes(&_card_counts[0], |
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150 _n_card_counts * sizeof(CardCountCacheEntry)); |
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151 Copy::fill_to_bytes(&_card_epochs[0], _n_card_counts * sizeof(CardEpochCacheEntry)); |
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152 |
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153 ModRefBarrierSet* bs = _g1h->mr_bs(); |
342 | 154 guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition"); |
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155 _ct_bs = (CardTableModRefBS*)bs; |
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156 _ct_bot = _ct_bs->byte_for_const(_g1h->reserved_region().start()); |
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157 |
342 | 158 _def_use_cache = true; |
159 _use_cache = true; | |
160 _hot_cache_size = (1 << G1ConcRSLogCacheSize); | |
6197 | 161 _hot_cache = NEW_C_HEAP_ARRAY(jbyte*, _hot_cache_size, mtGC); |
342 | 162 _n_hot = 0; |
163 _hot_cache_idx = 0; | |
889 | 164 |
165 // For refining the cards in the hot cache in parallel | |
166 int n_workers = (ParallelGCThreads > 0 ? | |
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167 _g1h->workers()->total_workers() : 1); |
889 | 168 _hot_cache_par_chunk_size = MAX2(1, _hot_cache_size / n_workers); |
169 _hot_cache_par_claimed_idx = 0; | |
342 | 170 } |
171 } | |
172 | |
794 | 173 void ConcurrentG1Refine::stop() { |
174 if (_threads != NULL) { | |
175 for (int i = 0; i < _n_threads; i++) { | |
176 _threads[i]->stop(); | |
177 } | |
178 } | |
179 } | |
180 | |
1111 | 181 void ConcurrentG1Refine::reinitialize_threads() { |
182 reset_threshold_step(); | |
183 if (_threads != NULL) { | |
184 for (int i = 0; i < _n_threads; i++) { | |
185 _threads[i]->initialize(); | |
186 } | |
187 } | |
188 } | |
189 | |
342 | 190 ConcurrentG1Refine::~ConcurrentG1Refine() { |
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191 if (G1ConcRSLogCacheSize > 0) { |
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192 // Please see the comment in allocate_card_count_cache |
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193 // for why we call os::malloc() and os::free() directly. |
342 | 194 assert(_card_counts != NULL, "Logic"); |
6197 | 195 os::free(_card_counts, mtGC); |
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196 assert(_card_epochs != NULL, "Logic"); |
6197 | 197 os::free(_card_epochs, mtGC); |
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198 |
342 | 199 assert(_hot_cache != NULL, "Logic"); |
6197 | 200 FREE_C_HEAP_ARRAY(jbyte*, _hot_cache, mtGC); |
342 | 201 } |
794 | 202 if (_threads != NULL) { |
203 for (int i = 0; i < _n_threads; i++) { | |
204 delete _threads[i]; | |
205 } | |
6197 | 206 FREE_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _threads, mtGC); |
342 | 207 } |
208 } | |
209 | |
794 | 210 void ConcurrentG1Refine::threads_do(ThreadClosure *tc) { |
211 if (_threads != NULL) { | |
212 for (int i = 0; i < _n_threads; i++) { | |
213 tc->do_thread(_threads[i]); | |
214 } | |
342 | 215 } |
216 } | |
217 | |
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218 bool ConcurrentG1Refine::is_young_card(jbyte* card_ptr) { |
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219 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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220 HeapRegion* r = _g1h->heap_region_containing(start); |
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221 if (r != NULL && r->is_young()) { |
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222 return true; |
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223 } |
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224 // This card is not associated with a heap region |
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225 // so can't be young. |
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226 return false; |
342 | 227 } |
228 | |
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229 jbyte* ConcurrentG1Refine::add_card_count(jbyte* card_ptr, int* count, bool* defer) { |
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230 unsigned new_card_num = ptr_2_card_num(card_ptr); |
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231 unsigned bucket = hash(new_card_num); |
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232 assert(0 <= bucket && bucket < _n_card_counts, "Bounds"); |
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233 |
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234 CardCountCacheEntry* count_ptr = &_card_counts[bucket]; |
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235 CardEpochCacheEntry* epoch_ptr = &_card_epochs[bucket]; |
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236 |
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237 // We have to construct a new entry if we haven't updated the counts |
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238 // during the current period, or if the count was updated for a |
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239 // different card number. |
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240 unsigned int new_epoch = (unsigned int) _n_periods; |
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241 julong new_epoch_entry = make_epoch_entry(new_card_num, new_epoch); |
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242 |
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243 while (true) { |
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244 // Fetch the previous epoch value |
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245 julong prev_epoch_entry = epoch_ptr->_value; |
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246 julong cas_res; |
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247 |
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248 if (extract_epoch(prev_epoch_entry) != new_epoch) { |
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249 // This entry has not yet been updated during this period. |
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250 // Note: we update the epoch value atomically to ensure |
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251 // that there is only one winner that updates the cached |
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252 // card_ptr value even though all the refine threads share |
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253 // the same epoch value. |
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254 |
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255 cas_res = (julong) Atomic::cmpxchg((jlong) new_epoch_entry, |
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256 (volatile jlong*)&epoch_ptr->_value, |
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257 (jlong) prev_epoch_entry); |
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258 |
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259 if (cas_res == prev_epoch_entry) { |
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260 // We have successfully won the race to update the |
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261 // epoch and card_num value. Make it look like the |
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262 // count and eviction count were previously cleared. |
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263 count_ptr->_count = 1; |
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264 count_ptr->_evict_count = 0; |
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265 *count = 0; |
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266 // We can defer the processing of card_ptr |
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267 *defer = true; |
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268 return card_ptr; |
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269 } |
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270 // We did not win the race to update the epoch field, so some other |
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271 // thread must have done it. The value that gets returned by CAS |
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272 // should be the new epoch value. |
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273 assert(extract_epoch(cas_res) == new_epoch, "unexpected epoch"); |
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274 // We could 'continue' here or just re-read the previous epoch value |
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275 prev_epoch_entry = epoch_ptr->_value; |
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276 } |
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277 |
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278 // The epoch entry for card_ptr has been updated during this period. |
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279 unsigned old_card_num = extract_card_num(prev_epoch_entry); |
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280 |
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281 // The card count that will be returned to caller |
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282 *count = count_ptr->_count; |
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283 |
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284 // Are we updating the count for the same card? |
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285 if (new_card_num == old_card_num) { |
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286 // Same card - just update the count. We could have more than one |
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287 // thread racing to update count for the current card. It should be |
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288 // OK not to use a CAS as the only penalty should be some missed |
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289 // increments of the count which delays identifying the card as "hot". |
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290 |
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291 if (*count < max_jubyte) count_ptr->_count++; |
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292 // We can defer the processing of card_ptr |
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293 *defer = true; |
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294 return card_ptr; |
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295 } |
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296 |
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297 // Different card - evict old card info |
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298 if (count_ptr->_evict_count < max_jubyte) count_ptr->_evict_count++; |
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299 if (count_ptr->_evict_count > G1CardCountCacheExpandThreshold) { |
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300 // Trigger a resize the next time we clear |
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301 _expand_card_counts = true; |
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302 } |
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303 |
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304 cas_res = (julong) Atomic::cmpxchg((jlong) new_epoch_entry, |
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305 (volatile jlong*)&epoch_ptr->_value, |
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306 (jlong) prev_epoch_entry); |
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307 |
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308 if (cas_res == prev_epoch_entry) { |
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309 // We successfully updated the card num value in the epoch entry |
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310 count_ptr->_count = 0; // initialize counter for new card num |
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311 jbyte* old_card_ptr = card_num_2_ptr(old_card_num); |
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312 |
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313 // Even though the region containg the card at old_card_num was not |
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314 // in the young list when old_card_num was recorded in the epoch |
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315 // cache it could have been added to the free list and subsequently |
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316 // added to the young list in the intervening time. See CR 6817995. |
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317 // We do not deal with this case here - it will be handled in |
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318 // HeapRegion::oops_on_card_seq_iterate_careful after it has been |
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319 // determined that the region containing the card has been allocated |
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320 // to, and it's safe to check the young type of the region. |
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321 |
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322 // We do not want to defer processing of card_ptr in this case |
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323 // (we need to refine old_card_ptr and card_ptr) |
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324 *defer = false; |
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325 return old_card_ptr; |
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326 } |
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327 // Someone else beat us - try again. |
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328 } |
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329 } |
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330 |
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331 jbyte* ConcurrentG1Refine::cache_insert(jbyte* card_ptr, bool* defer) { |
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332 int count; |
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333 jbyte* cached_ptr = add_card_count(card_ptr, &count, defer); |
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334 assert(cached_ptr != NULL, "bad cached card ptr"); |
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335 |
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336 // We've just inserted a card pointer into the card count cache |
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337 // and got back the card that we just inserted or (evicted) the |
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338 // previous contents of that count slot. |
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339 |
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340 // The card we got back could be in a young region. When the |
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341 // returned card (if evicted) was originally inserted, we had |
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342 // determined that its containing region was not young. However |
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343 // it is possible for the region to be freed during a cleanup |
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344 // pause, then reallocated and tagged as young which will result |
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345 // in the returned card residing in a young region. |
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346 // |
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347 // We do not deal with this case here - the change from non-young |
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348 // to young could be observed at any time - it will be handled in |
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349 // HeapRegion::oops_on_card_seq_iterate_careful after it has been |
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350 // determined that the region containing the card has been allocated |
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351 // to. |
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352 |
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353 // The card pointer we obtained from card count cache is not hot |
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354 // so do not store it in the cache; return it for immediate |
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355 // refining. |
342 | 356 if (count < G1ConcRSHotCardLimit) { |
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357 return cached_ptr; |
342 | 358 } |
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359 |
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360 // Otherwise, the pointer we got from the _card_counts cache is hot. |
342 | 361 jbyte* res = NULL; |
362 MutexLockerEx x(HotCardCache_lock, Mutex::_no_safepoint_check_flag); | |
363 if (_n_hot == _hot_cache_size) { | |
364 res = _hot_cache[_hot_cache_idx]; | |
365 _n_hot--; | |
366 } | |
367 // Now _n_hot < _hot_cache_size, and we can insert at _hot_cache_idx. | |
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368 _hot_cache[_hot_cache_idx] = cached_ptr; |
342 | 369 _hot_cache_idx++; |
370 if (_hot_cache_idx == _hot_cache_size) _hot_cache_idx = 0; | |
371 _n_hot++; | |
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372 |
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373 // The card obtained from the hot card cache could be in a young |
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374 // region. See above on how this can happen. |
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375 |
342 | 376 return res; |
377 } | |
378 | |
1705 | 379 void ConcurrentG1Refine::clean_up_cache(int worker_i, |
380 G1RemSet* g1rs, | |
381 DirtyCardQueue* into_cset_dcq) { | |
342 | 382 assert(!use_cache(), "cache should be disabled"); |
889 | 383 int start_idx; |
384 | |
385 while ((start_idx = _hot_cache_par_claimed_idx) < _n_hot) { // read once | |
386 int end_idx = start_idx + _hot_cache_par_chunk_size; | |
387 | |
388 if (start_idx == | |
389 Atomic::cmpxchg(end_idx, &_hot_cache_par_claimed_idx, start_idx)) { | |
390 // The current worker has successfully claimed the chunk [start_idx..end_idx) | |
391 end_idx = MIN2(end_idx, _n_hot); | |
392 for (int i = start_idx; i < end_idx; i++) { | |
393 jbyte* entry = _hot_cache[i]; | |
394 if (entry != NULL) { | |
1705 | 395 if (g1rs->concurrentRefineOneCard(entry, worker_i, true)) { |
396 // 'entry' contains references that point into the current | |
397 // collection set. We need to record 'entry' in the DCQS | |
398 // that's used for that purpose. | |
399 // | |
400 // The only time we care about recording cards that contain | |
401 // references that point into the collection set is during | |
402 // RSet updating while within an evacuation pause. | |
403 // In this case worker_i should be the id of a GC worker thread | |
404 assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause"); | |
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405 assert(worker_i < (int) (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), "incorrect worker id"); |
1705 | 406 into_cset_dcq->enqueue(entry); |
407 } | |
889 | 408 } |
409 } | |
342 | 410 } |
411 } | |
412 } | |
413 | |
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414 // The arrays used to hold the card counts and the epochs must have |
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415 // a 1:1 correspondence. Hence they are allocated and freed together |
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416 // Returns true if the allocations of both the counts and epochs |
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417 // were successful; false otherwise. |
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418 bool ConcurrentG1Refine::allocate_card_count_cache(size_t n, |
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419 CardCountCacheEntry** counts, |
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420 CardEpochCacheEntry** epochs) { |
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421 // We call the allocation/free routines directly for the counts |
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422 // and epochs arrays. The NEW_C_HEAP_ARRAY/FREE_C_HEAP_ARRAY |
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423 // macros call AllocateHeap and FreeHeap respectively. |
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424 // AllocateHeap will call vm_exit_out_of_memory in the event |
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425 // of an allocation failure and abort the JVM. With the |
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426 // _counts/epochs arrays we only need to abort the JVM if the |
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427 // initial allocation of these arrays fails. |
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428 // |
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429 // Additionally AllocateHeap/FreeHeap do some tracing of |
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430 // allocate/free calls so calling one without calling the |
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431 // other can cause inconsistencies in the tracing. So we |
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432 // call neither. |
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433 |
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434 assert(*counts == NULL, "out param"); |
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435 assert(*epochs == NULL, "out param"); |
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436 |
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437 size_t counts_size = n * sizeof(CardCountCacheEntry); |
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438 size_t epochs_size = n * sizeof(CardEpochCacheEntry); |
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439 |
6197 | 440 *counts = (CardCountCacheEntry*) os::malloc(counts_size, mtGC); |
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441 if (*counts == NULL) { |
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442 // allocation was unsuccessful |
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443 return false; |
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444 } |
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445 |
6197 | 446 *epochs = (CardEpochCacheEntry*) os::malloc(epochs_size, mtGC); |
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447 if (*epochs == NULL) { |
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448 // allocation was unsuccessful - free counts array |
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449 assert(*counts != NULL, "must be"); |
6197 | 450 os::free(*counts, mtGC); |
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451 *counts = NULL; |
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452 return false; |
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453 } |
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454 |
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455 // We successfully allocated both counts and epochs |
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456 return true; |
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457 } |
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458 |
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459 // Returns true if the card counts/epochs cache was |
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460 // successfully expanded; false otherwise. |
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461 bool ConcurrentG1Refine::expand_card_count_cache(int cache_size_idx) { |
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462 // Can we expand the card count and epoch tables? |
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463 if (_n_card_counts < _max_n_card_counts) { |
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464 assert(cache_size_idx >= 0 && cache_size_idx < MAX_CC_CACHE_INDEX, "oob"); |
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465 |
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466 size_t cache_size = _cc_cache_sizes[cache_size_idx]; |
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467 // Make sure we don't go bigger than we will ever need |
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468 cache_size = MIN2(cache_size, _max_n_card_counts); |
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469 |
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470 // Should we expand the card count and card epoch tables? |
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471 if (cache_size > _n_card_counts) { |
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472 // We have been asked to allocate new, larger, arrays for |
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473 // the card counts and the epochs. Attempt the allocation |
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474 // of both before we free the existing arrays in case |
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475 // the allocation is unsuccessful... |
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476 CardCountCacheEntry* counts = NULL; |
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477 CardEpochCacheEntry* epochs = NULL; |
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478 |
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479 if (allocate_card_count_cache(cache_size, &counts, &epochs)) { |
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480 // Allocation was successful. |
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481 // We can just free the old arrays; we're |
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482 // not interested in preserving the contents |
6197 | 483 if (_card_counts != NULL) os::free(_card_counts, mtGC); |
484 if (_card_epochs != NULL) os::free(_card_epochs, mtGC); | |
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485 |
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486 // Cache the size of the arrays and the index that got us there. |
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487 _n_card_counts = cache_size; |
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488 _cache_size_index = cache_size_idx; |
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489 |
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490 _card_counts = counts; |
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491 _card_epochs = epochs; |
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492 |
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493 // We successfully allocated/expanded the caches. |
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494 return true; |
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495 } |
342 | 496 } |
497 } | |
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498 |
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499 // We did not successfully expand the caches. |
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500 return false; |
342 | 501 } |
502 | |
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503 void ConcurrentG1Refine::clear_and_record_card_counts() { |
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504 if (G1ConcRSLogCacheSize == 0) { |
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505 return; |
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506 } |
342 | 507 |
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508 double start = os::elapsedTime(); |
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509 |
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510 if (_expand_card_counts) { |
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511 int new_idx = _cache_size_index + 1; |
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512 |
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513 if (expand_card_count_cache(new_idx)) { |
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514 // Allocation was successful and _n_card_counts has |
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515 // been updated to the new size. We only need to clear |
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516 // the epochs so we don't read a bogus epoch value |
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517 // when inserting a card into the hot card cache. |
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518 Copy::fill_to_bytes(&_card_epochs[0], _n_card_counts * sizeof(CardEpochCacheEntry)); |
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519 } |
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520 _expand_card_counts = false; |
342 | 521 } |
522 | |
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523 int this_epoch = (int) _n_periods; |
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524 assert((this_epoch+1) <= max_jint, "to many periods"); |
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525 // Update epoch |
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526 _n_periods++; |
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527 double cc_clear_time_ms = (os::elapsedTime() - start) * 1000; |
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528 _g1h->g1_policy()->phase_times()->record_cc_clear_time_ms(cc_clear_time_ms); |
342 | 529 } |
1019 | 530 |
531 void ConcurrentG1Refine::print_worker_threads_on(outputStream* st) const { | |
532 for (int i = 0; i < _n_threads; ++i) { | |
533 _threads[i]->print_on(st); | |
534 st->cr(); | |
535 } | |
536 } |