Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp @ 883:27f6a9b9c311
6864886: G1: rename -XX parameters related to update buffers
Summary: renaming a couple of update buffer-related parameters to make them more understandable and consistent.
Reviewed-by: iveresov, ysr
| author | tonyp |
|---|---|
| date | Wed, 29 Jul 2009 11:01:26 -0400 |
| parents | 215f81b4d9b3 |
| children | 7f807f55161a |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. | |
| 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 _co_tracker(G1CRGroup), | |
| 43 _interval_ms(5.0) | |
| 44 { | |
| 45 create_and_start(); | |
| 46 } | |
| 47 | |
| 48 void ConcurrentG1RefineThread::sample_young_list_rs_lengths() { | |
| 49 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 50 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 51 if (g1p->adaptive_young_list_length()) { | |
| 52 int regions_visited = 0; | |
| 53 | |
| 54 g1h->young_list_rs_length_sampling_init(); | |
| 55 while (g1h->young_list_rs_length_sampling_more()) { | |
| 56 g1h->young_list_rs_length_sampling_next(); | |
| 57 ++regions_visited; | |
| 58 | |
| 59 // we try to yield every time we visit 10 regions | |
| 60 if (regions_visited == 10) { | |
| 61 if (_sts.should_yield()) { | |
| 62 _sts.yield("G1 refine"); | |
| 63 // we just abandon the iteration | |
| 64 break; | |
| 65 } | |
| 66 regions_visited = 0; | |
| 67 } | |
| 68 } | |
| 69 | |
| 70 g1p->check_prediction_validity(); | |
| 71 } | |
| 72 } | |
| 73 | |
| 74 void ConcurrentG1RefineThread::run() { | |
| 75 initialize_in_thread(); | |
| 76 _vtime_start = os::elapsedVTime(); | |
| 77 wait_for_universe_init(); | |
| 78 | |
| 79 _co_tracker.enable(); | |
| 80 _co_tracker.start(); | |
| 81 | |
| 82 while (!_should_terminate) { | |
| 794 | 83 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 84 // Wait for completed log buffers to exist. | |
| 85 { | |
| 86 MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag); | |
| 87 while (((_worker_id == 0 && !dcqs.process_completed_buffers()) || | |
| 88 (_worker_id > 0 && !is_active())) && | |
| 89 !_should_terminate) { | |
| 90 DirtyCardQ_CBL_mon->wait(Mutex::_no_safepoint_check_flag); | |
| 91 } | |
| 92 } | |
| 93 | |
| 94 if (_should_terminate) { | |
| 95 return; | |
| 96 } | |
| 97 | |
| 98 // Now we take them off (this doesn't hold locks while it applies | |
| 99 // closures.) (If we did a full collection, then we'll do a full | |
| 100 // traversal. | |
| 101 _sts.join(); | |
| 102 int n_logs = 0; | |
| 103 int lower_limit = 0; | |
| 104 double start_vtime_sec; // only used when G1SmoothConcRefine is on | |
| 105 int prev_buffer_num; // only used when G1SmoothConcRefine is on | |
| 106 // This thread activation threshold | |
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107 int threshold = G1UpdateBufferQueueProcessingThreshold * _worker_id; |
| 794 | 108 // Next thread activation threshold |
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109 int next_threshold = threshold + G1UpdateBufferQueueProcessingThreshold; |
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110 int deactivation_threshold = MAX2<int>(threshold - G1UpdateBufferQueueProcessingThreshold / 2, 0); |
| 794 | 111 |
| 112 if (G1SmoothConcRefine) { | |
| 113 lower_limit = 0; | |
| 114 start_vtime_sec = os::elapsedVTime(); | |
| 115 prev_buffer_num = (int) dcqs.completed_buffers_num(); | |
| 342 | 116 } else { |
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6864886: G1: rename -XX parameters related to update buffers
tonyp
parents:
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117 lower_limit = G1UpdateBufferQueueProcessingThreshold / 4; // For now. |
| 342 | 118 } |
|
795
215f81b4d9b3
6841831: G1: assert(contains_reference(from),"We just added it!") fires
iveresov
parents:
794
diff
changeset
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119 while (dcqs.apply_closure_to_completed_buffer(_worker_id + _worker_id_offset, lower_limit)) { |
| 794 | 120 double end_vtime_sec; |
| 121 double elapsed_vtime_sec; | |
| 122 int elapsed_vtime_ms; | |
| 123 int curr_buffer_num = (int) dcqs.completed_buffers_num(); | |
| 124 | |
| 125 if (G1SmoothConcRefine) { | |
| 126 end_vtime_sec = os::elapsedVTime(); | |
| 127 elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
| 128 elapsed_vtime_ms = (int) (elapsed_vtime_sec * 1000.0); | |
| 129 | |
| 130 if (curr_buffer_num > prev_buffer_num || | |
| 131 curr_buffer_num > next_threshold) { | |
| 132 decreaseInterval(elapsed_vtime_ms); | |
| 133 } else if (curr_buffer_num < prev_buffer_num) { | |
| 134 increaseInterval(elapsed_vtime_ms); | |
| 135 } | |
| 136 } | |
| 137 if (_worker_id == 0) { | |
| 138 sample_young_list_rs_lengths(); | |
| 139 } else if (curr_buffer_num < deactivation_threshold) { | |
| 140 // If the number of the buffer has fallen below our threshold | |
| 141 // we should deactivate. The predecessor will reactivate this | |
| 142 // thread should the number of the buffers cross the threshold again. | |
| 143 MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag); | |
| 144 deactivate(); | |
| 145 if (G1TraceConcurrentRefinement) { | |
| 146 gclog_or_tty->print_cr("G1-Refine-deactivated worker %d", _worker_id); | |
| 147 } | |
| 148 break; | |
| 149 } | |
| 150 _co_tracker.update(false); | |
| 151 | |
| 152 // Check if we need to activate the next thread. | |
| 153 if (curr_buffer_num > next_threshold && _next != NULL && !_next->is_active()) { | |
| 154 MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag); | |
| 155 _next->activate(); | |
| 156 DirtyCardQ_CBL_mon->notify_all(); | |
| 157 if (G1TraceConcurrentRefinement) { | |
| 158 gclog_or_tty->print_cr("G1-Refine-activated worker %d", _next->_worker_id); | |
| 159 } | |
| 160 } | |
| 161 | |
| 162 if (G1SmoothConcRefine) { | |
| 163 prev_buffer_num = curr_buffer_num; | |
| 164 _sts.leave(); | |
| 165 os::sleep(Thread::current(), (jlong) _interval_ms, false); | |
| 166 _sts.join(); | |
| 167 start_vtime_sec = os::elapsedVTime(); | |
| 168 } | |
| 169 n_logs++; | |
| 170 } | |
| 171 _co_tracker.update(false); | |
| 342 | 172 _sts.leave(); |
| 794 | 173 |
| 342 | 174 if (os::supports_vtime()) { |
| 175 _vtime_accum = (os::elapsedVTime() - _vtime_start); | |
| 176 } else { | |
| 177 _vtime_accum = 0.0; | |
| 178 } | |
| 179 } | |
| 180 _sts.join(); | |
| 181 _co_tracker.update(true); | |
| 182 _sts.leave(); | |
| 183 assert(_should_terminate, "just checking"); | |
| 184 | |
| 185 terminate(); | |
| 186 } | |
| 187 | |
| 188 | |
| 189 void ConcurrentG1RefineThread::yield() { | |
| 751 | 190 if (G1TraceConcurrentRefinement) gclog_or_tty->print_cr("G1-Refine-yield"); |
| 342 | 191 _sts.yield("G1 refine"); |
| 751 | 192 if (G1TraceConcurrentRefinement) gclog_or_tty->print_cr("G1-Refine-yield-end"); |
| 342 | 193 } |
| 194 | |
| 195 void ConcurrentG1RefineThread::stop() { | |
| 196 // it is ok to take late safepoints here, if needed | |
| 197 { | |
| 198 MutexLockerEx mu(Terminator_lock); | |
| 199 _should_terminate = true; | |
| 200 } | |
| 201 | |
| 202 { | |
| 203 MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag); | |
| 204 DirtyCardQ_CBL_mon->notify_all(); | |
| 205 } | |
| 206 | |
| 207 { | |
| 208 MutexLockerEx mu(Terminator_lock); | |
| 209 while (!_has_terminated) { | |
| 210 Terminator_lock->wait(); | |
| 211 } | |
| 212 } | |
| 751 | 213 if (G1TraceConcurrentRefinement) gclog_or_tty->print_cr("G1-Refine-stop"); |
| 342 | 214 } |
| 215 | |
| 216 void ConcurrentG1RefineThread::print() { | |
| 217 gclog_or_tty->print("\"Concurrent G1 Refinement Thread\" "); | |
| 218 Thread::print(); | |
| 219 gclog_or_tty->cr(); | |
| 220 } |