Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp @ 3759:cfcf2ba8f3eb
Merge
author | never |
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date | Wed, 15 Jun 2011 10:20:03 -0700 |
parents | f95d63e2154a |
children | 4f41766176cf |
rev | line source |
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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 int worker_id_offset, int 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() { |
74 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
75 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
76 if (g1p->adaptive_young_list_length()) { | |
77 int regions_visited = 0; | |
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78 g1h->young_list()->rs_length_sampling_init(); |
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79 while (g1h->young_list()->rs_length_sampling_more()) { |
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80 g1h->young_list()->rs_length_sampling_next(); |
342 | 81 ++regions_visited; |
82 | |
83 // we try to yield every time we visit 10 regions | |
84 if (regions_visited == 10) { | |
85 if (_sts.should_yield()) { | |
86 _sts.yield("G1 refine"); | |
87 // we just abandon the iteration | |
88 break; | |
89 } | |
90 regions_visited = 0; | |
91 } | |
92 } | |
93 | |
94 g1p->check_prediction_validity(); | |
95 } | |
96 } | |
97 | |
1111 | 98 void ConcurrentG1RefineThread::run_young_rs_sampling() { |
99 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
342 | 100 _vtime_start = os::elapsedVTime(); |
1111 | 101 while(!_should_terminate) { |
102 _sts.join(); | |
103 sample_young_list_rs_lengths(); | |
104 _sts.leave(); | |
342 | 105 |
1111 | 106 if (os::supports_vtime()) { |
107 _vtime_accum = (os::elapsedVTime() - _vtime_start); | |
108 } else { | |
109 _vtime_accum = 0.0; | |
794 | 110 } |
111 | |
1111 | 112 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); |
113 if (_should_terminate) { | |
114 break; | |
115 } | |
1282 | 116 _monitor->wait(Mutex::_no_safepoint_check_flag, G1ConcRefinementServiceIntervalMillis); |
1111 | 117 } |
118 } | |
794 | 119 |
1111 | 120 void ConcurrentG1RefineThread::wait_for_completed_buffers() { |
121 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
122 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); | |
123 while (!_should_terminate && !is_active()) { | |
124 _monitor->wait(Mutex::_no_safepoint_check_flag); | |
125 } | |
126 } | |
127 | |
128 bool ConcurrentG1RefineThread::is_active() { | |
129 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
130 return _worker_id > 0 ? _active : dcqs.process_completed_buffers(); | |
131 } | |
132 | |
133 void ConcurrentG1RefineThread::activate() { | |
134 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); | |
135 if (_worker_id > 0) { | |
1282 | 136 if (G1TraceConcRefinement) { |
1111 | 137 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
138 gclog_or_tty->print_cr("G1-Refine-activated worker %d, on threshold %d, current %d", | |
139 _worker_id, _threshold, (int)dcqs.completed_buffers_num()); | |
342 | 140 } |
1111 | 141 set_active(true); |
142 } else { | |
143 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
144 dcqs.set_process_completed(true); | |
145 } | |
146 _monitor->notify(); | |
147 } | |
794 | 148 |
1111 | 149 void ConcurrentG1RefineThread::deactivate() { |
150 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); | |
151 if (_worker_id > 0) { | |
1282 | 152 if (G1TraceConcRefinement) { |
1111 | 153 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
154 gclog_or_tty->print_cr("G1-Refine-deactivated worker %d, off threshold %d, current %d", | |
155 _worker_id, _deactivation_threshold, (int)dcqs.completed_buffers_num()); | |
156 } | |
157 set_active(false); | |
158 } else { | |
159 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
160 dcqs.set_process_completed(false); | |
161 } | |
162 } | |
163 | |
164 void ConcurrentG1RefineThread::run() { | |
165 initialize_in_thread(); | |
166 wait_for_universe_init(); | |
794 | 167 |
1111 | 168 if (_worker_id >= cg1r()->worker_thread_num()) { |
169 run_young_rs_sampling(); | |
170 terminate(); | |
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171 return; |
1111 | 172 } |
173 | |
174 _vtime_start = os::elapsedVTime(); | |
175 while (!_should_terminate) { | |
176 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
177 | |
178 // Wait for work | |
179 wait_for_completed_buffers(); | |
180 | |
181 if (_should_terminate) { | |
182 break; | |
183 } | |
184 | |
185 _sts.join(); | |
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); | |
794 | 193 } |
1111 | 194 |
195 if (_worker_id > 0 && curr_buffer_num <= _deactivation_threshold) { | |
794 | 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 } | |
202 | |
203 // Check if we need to activate the next thread. | |
1111 | 204 if (_next != NULL && !_next->is_active() && curr_buffer_num > _next->_threshold) { |
794 | 205 _next->activate(); |
206 } | |
1111 | 207 } while (dcqs.apply_closure_to_completed_buffer(_worker_id + _worker_id_offset, cg1r()->green_zone())); |
794 | 208 |
1111 | 209 // We can exit the loop above while being active if there was a yield request. |
210 if (is_active()) { | |
211 deactivate(); | |
794 | 212 } |
1111 | 213 |
342 | 214 _sts.leave(); |
794 | 215 |
342 | 216 if (os::supports_vtime()) { |
217 _vtime_accum = (os::elapsedVTime() - _vtime_start); | |
218 } else { | |
219 _vtime_accum = 0.0; | |
220 } | |
221 } | |
222 assert(_should_terminate, "just checking"); | |
223 terminate(); | |
224 } | |
225 | |
226 | |
227 void ConcurrentG1RefineThread::yield() { | |
1282 | 228 if (G1TraceConcRefinement) { |
229 gclog_or_tty->print_cr("G1-Refine-yield"); | |
230 } | |
342 | 231 _sts.yield("G1 refine"); |
1282 | 232 if (G1TraceConcRefinement) { |
233 gclog_or_tty->print_cr("G1-Refine-yield-end"); | |
234 } | |
342 | 235 } |
236 | |
237 void ConcurrentG1RefineThread::stop() { | |
238 // it is ok to take late safepoints here, if needed | |
239 { | |
240 MutexLockerEx mu(Terminator_lock); | |
241 _should_terminate = true; | |
242 } | |
243 | |
244 { | |
1111 | 245 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); |
246 _monitor->notify(); | |
342 | 247 } |
248 | |
249 { | |
250 MutexLockerEx mu(Terminator_lock); | |
251 while (!_has_terminated) { | |
252 Terminator_lock->wait(); | |
253 } | |
254 } | |
1282 | 255 if (G1TraceConcRefinement) { |
256 gclog_or_tty->print_cr("G1-Refine-stop"); | |
257 } | |
342 | 258 } |
259 | |
1019 | 260 void ConcurrentG1RefineThread::print() const { |
261 print_on(tty); | |
342 | 262 } |
1019 | 263 |
264 void ConcurrentG1RefineThread::print_on(outputStream* st) const { | |
265 st->print("\"G1 Concurrent Refinement Thread#%d\" ", _worker_id); | |
266 Thread::print_on(st); | |
267 st->cr(); | |
268 } |