Mercurial > hg > truffle
comparison src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp @ 342:37f87013dfd8
6711316: Open source the Garbage-First garbage collector
Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
author | ysr |
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date | Thu, 05 Jun 2008 15:57:56 -0700 |
parents | |
children | 7ea5ca260b28 |
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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/_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); | |
110 tty->print_cr("[GC concurrent-mark-start]"); | |
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 } else { | |
140 if (TraceConcurrentMark) | |
141 gclog_or_tty->print_cr("CM-skip-mark-from-roots"); | |
142 } | |
143 | |
144 double mark_end_time = os::elapsedVTime(); | |
145 double mark_end_sec = os::elapsedTime(); | |
146 _vtime_mark_accum += (mark_end_time - cycle_start); | |
147 if (!cm()->has_aborted()) { | |
148 if (g1_policy->adaptive_young_list_length()) { | |
149 double now = os::elapsedTime(); | |
150 double remark_prediction_ms = g1_policy->predict_remark_time_ms(); | |
151 jlong sleep_time_ms = mmu_tracker->when_ms(now, remark_prediction_ms); | |
152 os::sleep(current_thread, sleep_time_ms, false); | |
153 } | |
154 | |
155 if (PrintGC) { | |
156 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
157 gclog_or_tty->stamp(PrintGCTimeStamps); | |
158 gclog_or_tty->print_cr("[GC concurrent-mark-end, %1.7lf sec]", | |
159 mark_end_sec - mark_start_sec); | |
160 } | |
161 | |
162 CMCheckpointRootsFinalClosure final_cl(_cm); | |
163 sprintf(verbose_str, "GC remark"); | |
164 VM_CGC_Operation op(&final_cl, verbose_str); | |
165 VMThread::execute(&op); | |
166 } else { | |
167 if (TraceConcurrentMark) | |
168 gclog_or_tty->print_cr("CM-skip-remark"); | |
169 } | |
170 if (cm()->restart_for_overflow() && | |
171 G1TraceMarkStackOverflow) { | |
172 gclog_or_tty->print_cr("Restarting conc marking because of MS overflow " | |
173 "in remark (restart #%d).", iter); | |
174 } | |
175 | |
176 if (cm()->restart_for_overflow()) { | |
177 if (PrintGC) { | |
178 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
179 gclog_or_tty->stamp(PrintGCTimeStamps); | |
180 gclog_or_tty->print_cr("[GC concurrent-mark-restart-for-overflow]"); | |
181 } | |
182 } | |
183 } while (cm()->restart_for_overflow()); | |
184 double counting_start_time = os::elapsedVTime(); | |
185 | |
186 // YSR: These look dubious (i.e. redundant) !!! FIX ME | |
187 slt()->manipulatePLL(SurrogateLockerThread::acquirePLL); | |
188 slt()->manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL); | |
189 | |
190 if (!cm()->has_aborted()) { | |
191 double count_start_sec = os::elapsedTime(); | |
192 if (PrintGC) { | |
193 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
194 gclog_or_tty->stamp(PrintGCTimeStamps); | |
195 gclog_or_tty->print_cr("[GC concurrent-count-start]"); | |
196 } | |
197 | |
198 _sts.join(); | |
199 _cm->calcDesiredRegions(); | |
200 _sts.leave(); | |
201 | |
202 if (!cm()->has_aborted()) { | |
203 double count_end_sec = os::elapsedTime(); | |
204 if (PrintGC) { | |
205 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
206 gclog_or_tty->stamp(PrintGCTimeStamps); | |
207 gclog_or_tty->print_cr("[GC concurrent-count-end, %1.7lf]", | |
208 count_end_sec - count_start_sec); | |
209 } | |
210 } | |
211 } else { | |
212 if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-skip-end-game"); | |
213 } | |
214 double end_time = os::elapsedVTime(); | |
215 _vtime_count_accum += (end_time - counting_start_time); | |
216 // Update the total virtual time before doing this, since it will try | |
217 // to measure it to get the vtime for this marking. We purposely | |
218 // neglect the presumably-short "completeCleanup" phase here. | |
219 _vtime_accum = (end_time - _vtime_start); | |
220 if (!cm()->has_aborted()) { | |
221 if (g1_policy->adaptive_young_list_length()) { | |
222 double now = os::elapsedTime(); | |
223 double cleanup_prediction_ms = g1_policy->predict_cleanup_time_ms(); | |
224 jlong sleep_time_ms = mmu_tracker->when_ms(now, cleanup_prediction_ms); | |
225 os::sleep(current_thread, sleep_time_ms, false); | |
226 } | |
227 | |
228 CMCleanUp cl_cl(_cm); | |
229 sprintf(verbose_str, "GC cleanup"); | |
230 VM_CGC_Operation op(&cl_cl, verbose_str); | |
231 VMThread::execute(&op); | |
232 } else { | |
233 if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-skip-cleanup"); | |
234 G1CollectedHeap::heap()->set_marking_complete(); | |
235 } | |
236 | |
237 if (!cm()->has_aborted()) { | |
238 double cleanup_start_sec = os::elapsedTime(); | |
239 if (PrintGC) { | |
240 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
241 gclog_or_tty->stamp(PrintGCTimeStamps); | |
242 gclog_or_tty->print_cr("[GC concurrent-cleanup-start]"); | |
243 } | |
244 | |
245 // Now do the remainder of the cleanup operation. | |
246 _sts.join(); | |
247 _cm->completeCleanup(); | |
248 if (!cm()->has_aborted()) { | |
249 g1_policy->record_concurrent_mark_cleanup_completed(); | |
250 | |
251 double cleanup_end_sec = os::elapsedTime(); | |
252 if (PrintGC) { | |
253 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
254 gclog_or_tty->stamp(PrintGCTimeStamps); | |
255 gclog_or_tty->print_cr("[GC concurrent-cleanup-end, %1.7lf]", | |
256 cleanup_end_sec - cleanup_start_sec); | |
257 } | |
258 } | |
259 _sts.leave(); | |
260 } | |
261 // We're done: no more unclean regions coming. | |
262 G1CollectedHeap::heap()->set_unclean_regions_coming(false); | |
263 | |
264 if (cm()->has_aborted()) { | |
265 if (PrintGC) { | |
266 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
267 gclog_or_tty->stamp(PrintGCTimeStamps); | |
268 gclog_or_tty->print_cr("[GC concurrent-mark-abort]"); | |
269 } | |
270 } | |
271 | |
272 _sts.join(); | |
273 _cm->disable_co_trackers(); | |
274 _sts.leave(); | |
275 | |
276 // we now want to allow clearing of the marking bitmap to be | |
277 // suspended by a collection pause. | |
278 _sts.join(); | |
279 _cm->clearNextBitmap(); | |
280 _sts.leave(); | |
281 } | |
282 } | |
283 assert(_should_terminate, "just checking"); | |
284 | |
285 terminate(); | |
286 } | |
287 | |
288 | |
289 void ConcurrentMarkThread::yield() { | |
290 if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-yield"); | |
291 _sts.yield("Concurrent Mark"); | |
292 if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-yield-end"); | |
293 } | |
294 | |
295 void ConcurrentMarkThread::stop() { | |
296 // it is ok to take late safepoints here, if needed | |
297 MutexLockerEx mu(Terminator_lock); | |
298 _should_terminate = true; | |
299 while (!_has_terminated) { | |
300 Terminator_lock->wait(); | |
301 } | |
302 if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-stop"); | |
303 } | |
304 | |
305 void ConcurrentMarkThread::print() { | |
306 gclog_or_tty->print("\"Concurrent Mark GC Thread\" "); | |
307 Thread::print(); | |
308 gclog_or_tty->cr(); | |
309 } | |
310 | |
311 void ConcurrentMarkThread::sleepBeforeNextCycle() { | |
312 clear_in_progress(); | |
313 // We join here because we don't want to do the "shouldConcurrentMark()" | |
314 // below while the world is otherwise stopped. | |
315 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); | |
316 while (!started()) { | |
317 if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-sleeping"); | |
318 CGC_lock->wait(Mutex::_no_safepoint_check_flag); | |
319 } | |
320 set_in_progress(); | |
321 clear_started(); | |
322 if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-starting"); | |
323 | |
324 return; | |
325 } | |
326 | |
327 // Note: this method, although exported by the ConcurrentMarkSweepThread, | |
328 // which is a non-JavaThread, can only be called by a JavaThread. | |
329 // Currently this is done at vm creation time (post-vm-init) by the | |
330 // main/Primordial (Java)Thread. | |
331 // XXX Consider changing this in the future to allow the CMS thread | |
332 // itself to create this thread? | |
333 void ConcurrentMarkThread::makeSurrogateLockerThread(TRAPS) { | |
334 assert(_slt == NULL, "SLT already created"); | |
335 _slt = SurrogateLockerThread::make(THREAD); | |
336 } |