Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp @ 20192:581e70386ec9
8039147: Cleanup SuspendibleThreadSet
Reviewed-by: brutisso, tschatzl, mgerdin
| author | pliden |
|---|---|
| date | Fri, 11 Apr 2014 12:29:24 +0200 |
| parents | 8847586c9037 |
| children | 570cb6369f17 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 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 "memory/resourceArea.hpp" | |
| 31 #include "runtime/handles.inline.hpp" | |
| 32 #include "runtime/mutexLocker.hpp" | |
| 342 | 33 |
| 34 ConcurrentG1RefineThread:: | |
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35 ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread *next, |
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36 uint worker_id_offset, uint worker_id) : |
| 342 | 37 ConcurrentGCThread(), |
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38 _worker_id_offset(worker_id_offset), |
| 794 | 39 _worker_id(worker_id), |
| 40 _active(false), | |
| 41 _next(next), | |
| 1111 | 42 _monitor(NULL), |
| 342 | 43 _cg1r(cg1r), |
| 1111 | 44 _vtime_accum(0.0) |
| 342 | 45 { |
| 1111 | 46 |
| 47 // Each thread has its own monitor. The i-th thread is responsible for signalling | |
| 48 // to thread i+1 if the number of buffers in the queue exceeds a threashold for this | |
| 49 // thread. Monitors are also used to wake up the threads during termination. | |
| 50 // The 0th worker in notified by mutator threads and has a special monitor. | |
| 51 // The last worker is used for young gen rset size sampling. | |
| 52 if (worker_id > 0) { | |
| 53 _monitor = new Monitor(Mutex::nonleaf, "Refinement monitor", true); | |
| 54 } else { | |
| 55 _monitor = DirtyCardQ_CBL_mon; | |
| 56 } | |
| 57 initialize(); | |
| 342 | 58 create_and_start(); |
| 59 } | |
| 60 | |
| 1111 | 61 void ConcurrentG1RefineThread::initialize() { |
| 62 if (_worker_id < cg1r()->worker_thread_num()) { | |
| 63 // Current thread activation threshold | |
| 64 _threshold = MIN2<int>(cg1r()->thread_threshold_step() * (_worker_id + 1) + cg1r()->green_zone(), | |
| 65 cg1r()->yellow_zone()); | |
| 66 // A thread deactivates once the number of buffer reached a deactivation threshold | |
| 67 _deactivation_threshold = MAX2<int>(_threshold - cg1r()->thread_threshold_step(), cg1r()->green_zone()); | |
| 68 } else { | |
| 69 set_active(true); | |
| 70 } | |
| 71 } | |
| 72 | |
| 342 | 73 void ConcurrentG1RefineThread::sample_young_list_rs_lengths() { |
| 20192 | 74 SuspendibleThreadSetJoiner sts; |
| 342 | 75 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 76 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 77 if (g1p->adaptive_young_list_length()) { | |
| 78 int regions_visited = 0; | |
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79 g1h->young_list()->rs_length_sampling_init(); |
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80 while (g1h->young_list()->rs_length_sampling_more()) { |
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81 g1h->young_list()->rs_length_sampling_next(); |
| 342 | 82 ++regions_visited; |
| 83 | |
| 84 // we try to yield every time we visit 10 regions | |
| 85 if (regions_visited == 10) { | |
| 20192 | 86 if (sts.should_yield()) { |
| 87 sts.yield(); | |
| 342 | 88 // we just abandon the iteration |
| 89 break; | |
| 90 } | |
| 91 regions_visited = 0; | |
| 92 } | |
| 93 } | |
| 94 | |
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95 g1p->revise_young_list_target_length_if_necessary(); |
| 342 | 96 } |
| 97 } | |
| 98 | |
| 1111 | 99 void ConcurrentG1RefineThread::run_young_rs_sampling() { |
| 100 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 342 | 101 _vtime_start = os::elapsedVTime(); |
| 1111 | 102 while(!_should_terminate) { |
| 103 sample_young_list_rs_lengths(); | |
| 342 | 104 |
| 1111 | 105 if (os::supports_vtime()) { |
| 106 _vtime_accum = (os::elapsedVTime() - _vtime_start); | |
| 107 } else { | |
| 108 _vtime_accum = 0.0; | |
| 794 | 109 } |
| 110 | |
| 1111 | 111 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); |
| 112 if (_should_terminate) { | |
| 113 break; | |
| 114 } | |
| 1282 | 115 _monitor->wait(Mutex::_no_safepoint_check_flag, G1ConcRefinementServiceIntervalMillis); |
| 1111 | 116 } |
| 117 } | |
| 794 | 118 |
| 1111 | 119 void ConcurrentG1RefineThread::wait_for_completed_buffers() { |
| 120 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 121 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); | |
| 122 while (!_should_terminate && !is_active()) { | |
| 123 _monitor->wait(Mutex::_no_safepoint_check_flag); | |
| 124 } | |
| 125 } | |
| 126 | |
| 127 bool ConcurrentG1RefineThread::is_active() { | |
| 128 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 129 return _worker_id > 0 ? _active : dcqs.process_completed_buffers(); | |
| 130 } | |
| 131 | |
| 132 void ConcurrentG1RefineThread::activate() { | |
| 133 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); | |
| 134 if (_worker_id > 0) { | |
| 1282 | 135 if (G1TraceConcRefinement) { |
| 1111 | 136 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 137 gclog_or_tty->print_cr("G1-Refine-activated worker %d, on threshold %d, current %d", | |
| 138 _worker_id, _threshold, (int)dcqs.completed_buffers_num()); | |
| 342 | 139 } |
| 1111 | 140 set_active(true); |
| 141 } else { | |
| 142 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 143 dcqs.set_process_completed(true); | |
| 144 } | |
| 145 _monitor->notify(); | |
| 146 } | |
| 794 | 147 |
| 1111 | 148 void ConcurrentG1RefineThread::deactivate() { |
| 149 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); | |
| 150 if (_worker_id > 0) { | |
| 1282 | 151 if (G1TraceConcRefinement) { |
| 1111 | 152 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 153 gclog_or_tty->print_cr("G1-Refine-deactivated worker %d, off threshold %d, current %d", | |
| 154 _worker_id, _deactivation_threshold, (int)dcqs.completed_buffers_num()); | |
| 155 } | |
| 156 set_active(false); | |
| 157 } else { | |
| 158 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 159 dcqs.set_process_completed(false); | |
| 160 } | |
| 161 } | |
| 162 | |
| 163 void ConcurrentG1RefineThread::run() { | |
| 164 initialize_in_thread(); | |
| 165 wait_for_universe_init(); | |
| 794 | 166 |
| 1111 | 167 if (_worker_id >= cg1r()->worker_thread_num()) { |
| 168 run_young_rs_sampling(); | |
| 169 terminate(); | |
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170 return; |
| 1111 | 171 } |
| 172 | |
| 173 _vtime_start = os::elapsedVTime(); | |
| 174 while (!_should_terminate) { | |
| 175 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 176 | |
| 177 // Wait for work | |
| 178 wait_for_completed_buffers(); | |
| 179 | |
| 180 if (_should_terminate) { | |
| 181 break; | |
| 182 } | |
| 183 | |
| 20192 | 184 { |
| 185 SuspendibleThreadSetJoiner sts; | |
| 186 | |
| 187 do { | |
| 188 int curr_buffer_num = (int)dcqs.completed_buffers_num(); | |
| 189 // If the number of the buffers falls down into the yellow zone, | |
| 190 // that means that the transition period after the evacuation pause has ended. | |
| 191 if (dcqs.completed_queue_padding() > 0 && curr_buffer_num <= cg1r()->yellow_zone()) { | |
| 192 dcqs.set_completed_queue_padding(0); | |
| 193 } | |
| 1111 | 194 |
| 20192 | 195 if (_worker_id > 0 && curr_buffer_num <= _deactivation_threshold) { |
| 196 // If the number of the buffer has fallen below our threshold | |
| 197 // we should deactivate. The predecessor will reactivate this | |
| 198 // thread should the number of the buffers cross the threshold again. | |
| 199 deactivate(); | |
| 200 break; | |
| 201 } | |
| 1111 | 202 |
| 20192 | 203 // Check if we need to activate the next thread. |
| 204 if (_next != NULL && !_next->is_active() && curr_buffer_num > _next->_threshold) { | |
| 205 _next->activate(); | |
| 206 } | |
| 207 } while (dcqs.apply_closure_to_completed_buffer(_worker_id + _worker_id_offset, cg1r()->green_zone())); | |
| 208 | |
| 209 // We can exit the loop above while being active if there was a yield request. | |
| 210 if (is_active()) { | |
| 794 | 211 deactivate(); |
| 212 } | |
| 213 } | |
| 1111 | 214 |
| 342 | 215 if (os::supports_vtime()) { |
| 216 _vtime_accum = (os::elapsedVTime() - _vtime_start); | |
| 217 } else { | |
| 218 _vtime_accum = 0.0; | |
| 219 } | |
| 220 } | |
| 221 assert(_should_terminate, "just checking"); | |
| 222 terminate(); | |
| 223 } | |
| 224 | |
| 225 void ConcurrentG1RefineThread::stop() { | |
| 226 // it is ok to take late safepoints here, if needed | |
| 227 { | |
| 228 MutexLockerEx mu(Terminator_lock); | |
| 229 _should_terminate = true; | |
| 230 } | |
| 231 | |
| 232 { | |
| 1111 | 233 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); |
| 234 _monitor->notify(); | |
| 342 | 235 } |
| 236 | |
| 237 { | |
| 238 MutexLockerEx mu(Terminator_lock); | |
| 239 while (!_has_terminated) { | |
| 240 Terminator_lock->wait(); | |
| 241 } | |
| 242 } | |
| 1282 | 243 if (G1TraceConcRefinement) { |
| 244 gclog_or_tty->print_cr("G1-Refine-stop"); | |
| 245 } | |
| 342 | 246 } |
| 247 | |
| 1019 | 248 void ConcurrentG1RefineThread::print() const { |
| 249 print_on(tty); | |
| 342 | 250 } |
| 1019 | 251 |
| 252 void ConcurrentG1RefineThread::print_on(outputStream* st) const { | |
| 253 st->print("\"G1 Concurrent Refinement Thread#%d\" ", _worker_id); | |
| 254 Thread::print_on(st); | |
| 255 st->cr(); | |
| 256 } |