Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp @ 1019:035d2e036a9b
6885041: G1: inconsistent thread dump
Summary: When G1 is enabled, thread dumps are inconsistent as the info for some of the G1 threads is not formatted properly.
Reviewed-by: ysr, johnc
| author | tonyp |
|---|---|
| date | Fri, 02 Oct 2009 16:12:07 -0400 |
| parents | e1fdf4fd34dc |
| children | 44f61c24ddab |
| rev | line source |
|---|---|
| 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/_concurrentG1RefineThread.cpp.incl" | |
| 27 | |
| 28 // ======= Concurrent Mark Thread ======== | |
| 29 | |
| 30 // The CM thread is created when the G1 garbage collector is used | |
| 31 | |
| 32 ConcurrentG1RefineThread:: | |
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33 ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread *next, |
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34 int worker_id_offset, int worker_id) : |
| 342 | 35 ConcurrentGCThread(), |
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36 _worker_id_offset(worker_id_offset), |
| 794 | 37 _worker_id(worker_id), |
| 38 _active(false), | |
| 39 _next(next), | |
| 342 | 40 _cg1r(cg1r), |
| 41 _vtime_accum(0.0), | |
| 42 _interval_ms(5.0) | |
| 43 { | |
| 44 create_and_start(); | |
| 45 } | |
| 46 | |
| 47 void ConcurrentG1RefineThread::sample_young_list_rs_lengths() { | |
| 48 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 49 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 50 if (g1p->adaptive_young_list_length()) { | |
| 51 int regions_visited = 0; | |
| 52 | |
| 53 g1h->young_list_rs_length_sampling_init(); | |
| 54 while (g1h->young_list_rs_length_sampling_more()) { | |
| 55 g1h->young_list_rs_length_sampling_next(); | |
| 56 ++regions_visited; | |
| 57 | |
| 58 // we try to yield every time we visit 10 regions | |
| 59 if (regions_visited == 10) { | |
| 60 if (_sts.should_yield()) { | |
| 61 _sts.yield("G1 refine"); | |
| 62 // we just abandon the iteration | |
| 63 break; | |
| 64 } | |
| 65 regions_visited = 0; | |
| 66 } | |
| 67 } | |
| 68 | |
| 69 g1p->check_prediction_validity(); | |
| 70 } | |
| 71 } | |
| 72 | |
| 73 void ConcurrentG1RefineThread::run() { | |
| 74 initialize_in_thread(); | |
| 75 _vtime_start = os::elapsedVTime(); | |
| 76 wait_for_universe_init(); | |
| 77 | |
| 78 while (!_should_terminate) { | |
| 794 | 79 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 80 // Wait for completed log buffers to exist. | |
| 81 { | |
| 82 MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag); | |
| 83 while (((_worker_id == 0 && !dcqs.process_completed_buffers()) || | |
| 84 (_worker_id > 0 && !is_active())) && | |
| 85 !_should_terminate) { | |
| 86 DirtyCardQ_CBL_mon->wait(Mutex::_no_safepoint_check_flag); | |
| 87 } | |
| 88 } | |
| 89 | |
| 90 if (_should_terminate) { | |
| 91 return; | |
| 92 } | |
| 93 | |
| 94 // Now we take them off (this doesn't hold locks while it applies | |
| 95 // closures.) (If we did a full collection, then we'll do a full | |
| 96 // traversal. | |
| 97 _sts.join(); | |
| 98 int n_logs = 0; | |
| 99 int lower_limit = 0; | |
| 100 double start_vtime_sec; // only used when G1SmoothConcRefine is on | |
| 101 int prev_buffer_num; // only used when G1SmoothConcRefine is on | |
| 102 // This thread activation threshold | |
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103 int threshold = G1UpdateBufferQueueProcessingThreshold * _worker_id; |
| 794 | 104 // Next thread activation threshold |
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105 int next_threshold = threshold + G1UpdateBufferQueueProcessingThreshold; |
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106 int deactivation_threshold = MAX2<int>(threshold - G1UpdateBufferQueueProcessingThreshold / 2, 0); |
| 794 | 107 |
| 108 if (G1SmoothConcRefine) { | |
| 109 lower_limit = 0; | |
| 110 start_vtime_sec = os::elapsedVTime(); | |
| 111 prev_buffer_num = (int) dcqs.completed_buffers_num(); | |
| 342 | 112 } else { |
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113 lower_limit = G1UpdateBufferQueueProcessingThreshold / 4; // For now. |
| 342 | 114 } |
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115 while (dcqs.apply_closure_to_completed_buffer(_worker_id + _worker_id_offset, lower_limit)) { |
| 794 | 116 double end_vtime_sec; |
| 117 double elapsed_vtime_sec; | |
| 118 int elapsed_vtime_ms; | |
| 119 int curr_buffer_num = (int) dcqs.completed_buffers_num(); | |
| 120 | |
| 121 if (G1SmoothConcRefine) { | |
| 122 end_vtime_sec = os::elapsedVTime(); | |
| 123 elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
| 124 elapsed_vtime_ms = (int) (elapsed_vtime_sec * 1000.0); | |
| 125 | |
| 126 if (curr_buffer_num > prev_buffer_num || | |
| 127 curr_buffer_num > next_threshold) { | |
| 128 decreaseInterval(elapsed_vtime_ms); | |
| 129 } else if (curr_buffer_num < prev_buffer_num) { | |
| 130 increaseInterval(elapsed_vtime_ms); | |
| 131 } | |
| 132 } | |
| 133 if (_worker_id == 0) { | |
| 134 sample_young_list_rs_lengths(); | |
| 135 } else if (curr_buffer_num < deactivation_threshold) { | |
| 136 // If the number of the buffer has fallen below our threshold | |
| 137 // we should deactivate. The predecessor will reactivate this | |
| 138 // thread should the number of the buffers cross the threshold again. | |
| 139 MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag); | |
| 140 deactivate(); | |
| 141 if (G1TraceConcurrentRefinement) { | |
| 142 gclog_or_tty->print_cr("G1-Refine-deactivated worker %d", _worker_id); | |
| 143 } | |
| 144 break; | |
| 145 } | |
| 146 | |
| 147 // Check if we need to activate the next thread. | |
| 148 if (curr_buffer_num > next_threshold && _next != NULL && !_next->is_active()) { | |
| 149 MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag); | |
| 150 _next->activate(); | |
| 151 DirtyCardQ_CBL_mon->notify_all(); | |
| 152 if (G1TraceConcurrentRefinement) { | |
| 153 gclog_or_tty->print_cr("G1-Refine-activated worker %d", _next->_worker_id); | |
| 154 } | |
| 155 } | |
| 156 | |
| 157 if (G1SmoothConcRefine) { | |
| 158 prev_buffer_num = curr_buffer_num; | |
| 159 _sts.leave(); | |
| 160 os::sleep(Thread::current(), (jlong) _interval_ms, false); | |
| 161 _sts.join(); | |
| 162 start_vtime_sec = os::elapsedVTime(); | |
| 163 } | |
| 164 n_logs++; | |
| 165 } | |
| 342 | 166 _sts.leave(); |
| 794 | 167 |
| 342 | 168 if (os::supports_vtime()) { |
| 169 _vtime_accum = (os::elapsedVTime() - _vtime_start); | |
| 170 } else { | |
| 171 _vtime_accum = 0.0; | |
| 172 } | |
| 173 } | |
| 174 assert(_should_terminate, "just checking"); | |
| 175 | |
| 176 terminate(); | |
| 177 } | |
| 178 | |
| 179 | |
| 180 void ConcurrentG1RefineThread::yield() { | |
| 751 | 181 if (G1TraceConcurrentRefinement) gclog_or_tty->print_cr("G1-Refine-yield"); |
| 342 | 182 _sts.yield("G1 refine"); |
| 751 | 183 if (G1TraceConcurrentRefinement) gclog_or_tty->print_cr("G1-Refine-yield-end"); |
| 342 | 184 } |
| 185 | |
| 186 void ConcurrentG1RefineThread::stop() { | |
| 187 // it is ok to take late safepoints here, if needed | |
| 188 { | |
| 189 MutexLockerEx mu(Terminator_lock); | |
| 190 _should_terminate = true; | |
| 191 } | |
| 192 | |
| 193 { | |
| 194 MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag); | |
| 195 DirtyCardQ_CBL_mon->notify_all(); | |
| 196 } | |
| 197 | |
| 198 { | |
| 199 MutexLockerEx mu(Terminator_lock); | |
| 200 while (!_has_terminated) { | |
| 201 Terminator_lock->wait(); | |
| 202 } | |
| 203 } | |
| 751 | 204 if (G1TraceConcurrentRefinement) gclog_or_tty->print_cr("G1-Refine-stop"); |
| 342 | 205 } |
| 206 | |
| 1019 | 207 void ConcurrentG1RefineThread::print() const { |
| 208 print_on(tty); | |
| 342 | 209 } |
| 1019 | 210 |
| 211 void ConcurrentG1RefineThread::print_on(outputStream* st) const { | |
| 212 st->print("\"G1 Concurrent Refinement Thread#%d\" ", _worker_id); | |
| 213 Thread::print_on(st); | |
| 214 st->cr(); | |
| 215 } |