Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp @ 1703:f6f3eef8a521
6581734: CMS Old Gen's collection usage is zero after GC which is incorrect
Summary: Management code enabled for use by a concurrent collector.
Reviewed-by: mchung, ysr
author | kevinw |
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date | Fri, 30 Jul 2010 22:43:50 +0100 |
parents | c18cbe5936b8 |
children | 4e5661ba9d98 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2009, 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 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_concurrentMarkThread.cpp.incl" | |
27 | |
28 // ======= Concurrent Mark Thread ======== | |
29 | |
30 // The CM thread is created when the G1 garbage collector is used | |
31 | |
32 SurrogateLockerThread* | |
33 ConcurrentMarkThread::_slt = NULL; | |
34 | |
35 ConcurrentMarkThread::ConcurrentMarkThread(ConcurrentMark* cm) : | |
36 ConcurrentGCThread(), | |
37 _cm(cm), | |
38 _started(false), | |
39 _in_progress(false), | |
40 _vtime_accum(0.0), | |
41 _vtime_mark_accum(0.0), | |
42 _vtime_count_accum(0.0) | |
43 { | |
44 create_and_start(); | |
45 } | |
46 | |
47 class CMCheckpointRootsInitialClosure: public VoidClosure { | |
48 | |
49 ConcurrentMark* _cm; | |
50 public: | |
51 | |
52 CMCheckpointRootsInitialClosure(ConcurrentMark* cm) : | |
53 _cm(cm) {} | |
54 | |
55 void do_void(){ | |
56 _cm->checkpointRootsInitial(); | |
57 } | |
58 }; | |
59 | |
60 class CMCheckpointRootsFinalClosure: public VoidClosure { | |
61 | |
62 ConcurrentMark* _cm; | |
63 public: | |
64 | |
65 CMCheckpointRootsFinalClosure(ConcurrentMark* cm) : | |
66 _cm(cm) {} | |
67 | |
68 void do_void(){ | |
69 _cm->checkpointRootsFinal(false); // !clear_all_soft_refs | |
70 } | |
71 }; | |
72 | |
73 class CMCleanUp: public VoidClosure { | |
74 ConcurrentMark* _cm; | |
75 public: | |
76 | |
77 CMCleanUp(ConcurrentMark* cm) : | |
78 _cm(cm) {} | |
79 | |
80 void do_void(){ | |
81 _cm->cleanup(); | |
82 } | |
83 }; | |
84 | |
85 | |
86 | |
87 void ConcurrentMarkThread::run() { | |
88 initialize_in_thread(); | |
89 _vtime_start = os::elapsedVTime(); | |
90 wait_for_universe_init(); | |
91 | |
92 G1CollectedHeap* g1 = G1CollectedHeap::heap(); | |
93 G1CollectorPolicy* g1_policy = g1->g1_policy(); | |
94 G1MMUTracker *mmu_tracker = g1_policy->mmu_tracker(); | |
95 Thread *current_thread = Thread::current(); | |
96 | |
97 while (!_should_terminate) { | |
98 // wait until started is set. | |
99 sleepBeforeNextCycle(); | |
100 { | |
101 ResourceMark rm; | |
102 HandleMark hm; | |
103 double cycle_start = os::elapsedVTime(); | |
104 double mark_start_sec = os::elapsedTime(); | |
105 char verbose_str[128]; | |
106 | |
107 if (PrintGC) { | |
108 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
109 gclog_or_tty->stamp(PrintGCTimeStamps); | |
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110 gclog_or_tty->print_cr("[GC concurrent-mark-start]"); |
342 | 111 } |
112 | |
113 if (!g1_policy->in_young_gc_mode()) { | |
114 // this ensures the flag is not set if we bail out of the marking | |
115 // cycle; normally the flag is cleared immediately after cleanup | |
116 g1->set_marking_complete(); | |
117 | |
118 if (g1_policy->adaptive_young_list_length()) { | |
119 double now = os::elapsedTime(); | |
120 double init_prediction_ms = g1_policy->predict_init_time_ms(); | |
121 jlong sleep_time_ms = mmu_tracker->when_ms(now, init_prediction_ms); | |
122 os::sleep(current_thread, sleep_time_ms, false); | |
123 } | |
124 | |
125 // We don't have to skip here if we've been asked to restart, because | |
126 // in the worst case we just enqueue a new VM operation to start a | |
127 // marking. Note that the init operation resets has_aborted() | |
128 CMCheckpointRootsInitialClosure init_cl(_cm); | |
129 strcpy(verbose_str, "GC initial-mark"); | |
130 VM_CGC_Operation op(&init_cl, verbose_str); | |
131 VMThread::execute(&op); | |
132 } | |
133 | |
134 int iter = 0; | |
135 do { | |
136 iter++; | |
137 if (!cm()->has_aborted()) { | |
138 _cm->markFromRoots(); | |
139 } | |
140 | |
141 double mark_end_time = os::elapsedVTime(); | |
142 double mark_end_sec = os::elapsedTime(); | |
143 _vtime_mark_accum += (mark_end_time - cycle_start); | |
144 if (!cm()->has_aborted()) { | |
145 if (g1_policy->adaptive_young_list_length()) { | |
146 double now = os::elapsedTime(); | |
147 double remark_prediction_ms = g1_policy->predict_remark_time_ms(); | |
148 jlong sleep_time_ms = mmu_tracker->when_ms(now, remark_prediction_ms); | |
149 os::sleep(current_thread, sleep_time_ms, false); | |
150 } | |
151 | |
152 if (PrintGC) { | |
153 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
154 gclog_or_tty->stamp(PrintGCTimeStamps); | |
155 gclog_or_tty->print_cr("[GC concurrent-mark-end, %1.7lf sec]", | |
156 mark_end_sec - mark_start_sec); | |
157 } | |
158 | |
159 CMCheckpointRootsFinalClosure final_cl(_cm); | |
160 sprintf(verbose_str, "GC remark"); | |
161 VM_CGC_Operation op(&final_cl, verbose_str); | |
162 VMThread::execute(&op); | |
163 } | |
164 if (cm()->restart_for_overflow() && | |
165 G1TraceMarkStackOverflow) { | |
166 gclog_or_tty->print_cr("Restarting conc marking because of MS overflow " | |
167 "in remark (restart #%d).", iter); | |
168 } | |
169 | |
170 if (cm()->restart_for_overflow()) { | |
171 if (PrintGC) { | |
172 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
173 gclog_or_tty->stamp(PrintGCTimeStamps); | |
174 gclog_or_tty->print_cr("[GC concurrent-mark-restart-for-overflow]"); | |
175 } | |
176 } | |
177 } while (cm()->restart_for_overflow()); | |
178 double counting_start_time = os::elapsedVTime(); | |
179 | |
180 // YSR: These look dubious (i.e. redundant) !!! FIX ME | |
181 slt()->manipulatePLL(SurrogateLockerThread::acquirePLL); | |
182 slt()->manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL); | |
183 | |
184 if (!cm()->has_aborted()) { | |
185 double count_start_sec = os::elapsedTime(); | |
186 if (PrintGC) { | |
187 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
188 gclog_or_tty->stamp(PrintGCTimeStamps); | |
189 gclog_or_tty->print_cr("[GC concurrent-count-start]"); | |
190 } | |
191 | |
192 _sts.join(); | |
193 _cm->calcDesiredRegions(); | |
194 _sts.leave(); | |
195 | |
196 if (!cm()->has_aborted()) { | |
197 double count_end_sec = os::elapsedTime(); | |
198 if (PrintGC) { | |
199 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
200 gclog_or_tty->stamp(PrintGCTimeStamps); | |
201 gclog_or_tty->print_cr("[GC concurrent-count-end, %1.7lf]", | |
202 count_end_sec - count_start_sec); | |
203 } | |
204 } | |
205 } | |
206 double end_time = os::elapsedVTime(); | |
207 _vtime_count_accum += (end_time - counting_start_time); | |
208 // Update the total virtual time before doing this, since it will try | |
209 // to measure it to get the vtime for this marking. We purposely | |
210 // neglect the presumably-short "completeCleanup" phase here. | |
211 _vtime_accum = (end_time - _vtime_start); | |
212 if (!cm()->has_aborted()) { | |
213 if (g1_policy->adaptive_young_list_length()) { | |
214 double now = os::elapsedTime(); | |
215 double cleanup_prediction_ms = g1_policy->predict_cleanup_time_ms(); | |
216 jlong sleep_time_ms = mmu_tracker->when_ms(now, cleanup_prediction_ms); | |
217 os::sleep(current_thread, sleep_time_ms, false); | |
218 } | |
219 | |
220 CMCleanUp cl_cl(_cm); | |
221 sprintf(verbose_str, "GC cleanup"); | |
222 VM_CGC_Operation op(&cl_cl, verbose_str); | |
223 VMThread::execute(&op); | |
224 } else { | |
225 G1CollectedHeap::heap()->set_marking_complete(); | |
226 } | |
227 | |
228 if (!cm()->has_aborted()) { | |
229 double cleanup_start_sec = os::elapsedTime(); | |
230 if (PrintGC) { | |
231 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
232 gclog_or_tty->stamp(PrintGCTimeStamps); | |
233 gclog_or_tty->print_cr("[GC concurrent-cleanup-start]"); | |
234 } | |
235 | |
236 // Now do the remainder of the cleanup operation. | |
237 _sts.join(); | |
238 _cm->completeCleanup(); | |
239 if (!cm()->has_aborted()) { | |
240 g1_policy->record_concurrent_mark_cleanup_completed(); | |
241 | |
242 double cleanup_end_sec = os::elapsedTime(); | |
243 if (PrintGC) { | |
244 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
245 gclog_or_tty->stamp(PrintGCTimeStamps); | |
246 gclog_or_tty->print_cr("[GC concurrent-cleanup-end, %1.7lf]", | |
247 cleanup_end_sec - cleanup_start_sec); | |
248 } | |
249 } | |
250 _sts.leave(); | |
251 } | |
252 // We're done: no more unclean regions coming. | |
253 G1CollectedHeap::heap()->set_unclean_regions_coming(false); | |
254 | |
255 if (cm()->has_aborted()) { | |
256 if (PrintGC) { | |
257 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
258 gclog_or_tty->stamp(PrintGCTimeStamps); | |
259 gclog_or_tty->print_cr("[GC concurrent-mark-abort]"); | |
260 } | |
261 } | |
262 | |
263 // we now want to allow clearing of the marking bitmap to be | |
264 // suspended by a collection pause. | |
265 _sts.join(); | |
266 _cm->clearNextBitmap(); | |
267 _sts.leave(); | |
268 } | |
269 } | |
270 assert(_should_terminate, "just checking"); | |
271 | |
272 terminate(); | |
273 } | |
274 | |
275 | |
276 void ConcurrentMarkThread::yield() { | |
277 _sts.yield("Concurrent Mark"); | |
278 } | |
279 | |
280 void ConcurrentMarkThread::stop() { | |
281 // it is ok to take late safepoints here, if needed | |
282 MutexLockerEx mu(Terminator_lock); | |
283 _should_terminate = true; | |
284 while (!_has_terminated) { | |
285 Terminator_lock->wait(); | |
286 } | |
287 } | |
288 | |
1019 | 289 void ConcurrentMarkThread::print() const { |
290 print_on(tty); | |
291 } | |
292 | |
293 void ConcurrentMarkThread::print_on(outputStream* st) const { | |
294 st->print("\"G1 Main Concurrent Mark GC Thread\" "); | |
295 Thread::print_on(st); | |
296 st->cr(); | |
342 | 297 } |
298 | |
299 void ConcurrentMarkThread::sleepBeforeNextCycle() { | |
300 clear_in_progress(); | |
301 // We join here because we don't want to do the "shouldConcurrentMark()" | |
302 // below while the world is otherwise stopped. | |
303 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); | |
304 while (!started()) { | |
305 CGC_lock->wait(Mutex::_no_safepoint_check_flag); | |
306 } | |
307 set_in_progress(); | |
308 clear_started(); | |
309 } | |
310 | |
311 // Note: this method, although exported by the ConcurrentMarkSweepThread, | |
312 // which is a non-JavaThread, can only be called by a JavaThread. | |
313 // Currently this is done at vm creation time (post-vm-init) by the | |
314 // main/Primordial (Java)Thread. | |
315 // XXX Consider changing this in the future to allow the CMS thread | |
316 // itself to create this thread? | |
317 void ConcurrentMarkThread::makeSurrogateLockerThread(TRAPS) { | |
318 assert(_slt == NULL, "SLT already created"); | |
319 _slt = SurrogateLockerThread::make(THREAD); | |
320 } |