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annotate src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp @ 2426:1d1603768966
7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass
Summary: Update the copyright to be 2010 on all changed files in OpenJDK
Reviewed-by: ohair
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date | Tue, 05 Apr 2011 14:12:31 -0700 |
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342 | 1 /* |
2152 | 2 * Copyright (c) 2001, 2011, 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/concurrentMarkThread.inline.hpp" | |
27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
28 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
29 #include "gc_implementation/g1/g1MMUTracker.hpp" | |
30 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
31 #include "memory/resourceArea.hpp" | |
32 #include "runtime/vmThread.hpp" | |
342 | 33 |
34 // ======= Concurrent Mark Thread ======== | |
35 | |
36 // The CM thread is created when the G1 garbage collector is used | |
37 | |
38 SurrogateLockerThread* | |
39 ConcurrentMarkThread::_slt = NULL; | |
40 | |
41 ConcurrentMarkThread::ConcurrentMarkThread(ConcurrentMark* cm) : | |
42 ConcurrentGCThread(), | |
43 _cm(cm), | |
44 _started(false), | |
45 _in_progress(false), | |
46 _vtime_accum(0.0), | |
47 _vtime_mark_accum(0.0), | |
48 _vtime_count_accum(0.0) | |
49 { | |
50 create_and_start(); | |
51 } | |
52 | |
53 class CMCheckpointRootsInitialClosure: public VoidClosure { | |
54 | |
55 ConcurrentMark* _cm; | |
56 public: | |
57 | |
58 CMCheckpointRootsInitialClosure(ConcurrentMark* cm) : | |
59 _cm(cm) {} | |
60 | |
61 void do_void(){ | |
62 _cm->checkpointRootsInitial(); | |
63 } | |
64 }; | |
65 | |
66 class CMCheckpointRootsFinalClosure: public VoidClosure { | |
67 | |
68 ConcurrentMark* _cm; | |
69 public: | |
70 | |
71 CMCheckpointRootsFinalClosure(ConcurrentMark* cm) : | |
72 _cm(cm) {} | |
73 | |
74 void do_void(){ | |
75 _cm->checkpointRootsFinal(false); // !clear_all_soft_refs | |
76 } | |
77 }; | |
78 | |
79 class CMCleanUp: public VoidClosure { | |
80 ConcurrentMark* _cm; | |
81 public: | |
82 | |
83 CMCleanUp(ConcurrentMark* cm) : | |
84 _cm(cm) {} | |
85 | |
86 void do_void(){ | |
87 _cm->cleanup(); | |
88 } | |
89 }; | |
90 | |
91 | |
92 | |
93 void ConcurrentMarkThread::run() { | |
94 initialize_in_thread(); | |
95 _vtime_start = os::elapsedVTime(); | |
96 wait_for_universe_init(); | |
97 | |
2152 | 98 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
99 G1CollectorPolicy* g1_policy = g1h->g1_policy(); | |
342 | 100 G1MMUTracker *mmu_tracker = g1_policy->mmu_tracker(); |
101 Thread *current_thread = Thread::current(); | |
102 | |
103 while (!_should_terminate) { | |
104 // wait until started is set. | |
105 sleepBeforeNextCycle(); | |
106 { | |
107 ResourceMark rm; | |
108 HandleMark hm; | |
109 double cycle_start = os::elapsedVTime(); | |
110 double mark_start_sec = os::elapsedTime(); | |
111 char verbose_str[128]; | |
112 | |
113 if (PrintGC) { | |
114 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
115 gclog_or_tty->stamp(PrintGCTimeStamps); | |
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116 gclog_or_tty->print_cr("[GC concurrent-mark-start]"); |
342 | 117 } |
118 | |
119 if (!g1_policy->in_young_gc_mode()) { | |
120 // this ensures the flag is not set if we bail out of the marking | |
121 // cycle; normally the flag is cleared immediately after cleanup | |
2152 | 122 g1h->set_marking_complete(); |
342 | 123 |
124 if (g1_policy->adaptive_young_list_length()) { | |
125 double now = os::elapsedTime(); | |
126 double init_prediction_ms = g1_policy->predict_init_time_ms(); | |
127 jlong sleep_time_ms = mmu_tracker->when_ms(now, init_prediction_ms); | |
128 os::sleep(current_thread, sleep_time_ms, false); | |
129 } | |
130 | |
131 // We don't have to skip here if we've been asked to restart, because | |
132 // in the worst case we just enqueue a new VM operation to start a | |
133 // marking. Note that the init operation resets has_aborted() | |
134 CMCheckpointRootsInitialClosure init_cl(_cm); | |
135 strcpy(verbose_str, "GC initial-mark"); | |
136 VM_CGC_Operation op(&init_cl, verbose_str); | |
137 VMThread::execute(&op); | |
138 } | |
139 | |
140 int iter = 0; | |
141 do { | |
142 iter++; | |
143 if (!cm()->has_aborted()) { | |
144 _cm->markFromRoots(); | |
145 } | |
146 | |
147 double mark_end_time = os::elapsedVTime(); | |
148 double mark_end_sec = os::elapsedTime(); | |
149 _vtime_mark_accum += (mark_end_time - cycle_start); | |
150 if (!cm()->has_aborted()) { | |
151 if (g1_policy->adaptive_young_list_length()) { | |
152 double now = os::elapsedTime(); | |
153 double remark_prediction_ms = g1_policy->predict_remark_time_ms(); | |
154 jlong sleep_time_ms = mmu_tracker->when_ms(now, remark_prediction_ms); | |
155 os::sleep(current_thread, sleep_time_ms, false); | |
156 } | |
157 | |
158 if (PrintGC) { | |
159 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
160 gclog_or_tty->stamp(PrintGCTimeStamps); | |
161 gclog_or_tty->print_cr("[GC concurrent-mark-end, %1.7lf sec]", | |
162 mark_end_sec - mark_start_sec); | |
163 } | |
164 | |
165 CMCheckpointRootsFinalClosure final_cl(_cm); | |
166 sprintf(verbose_str, "GC remark"); | |
167 VM_CGC_Operation op(&final_cl, verbose_str); | |
168 VMThread::execute(&op); | |
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 } | |
212 double end_time = os::elapsedVTime(); | |
213 _vtime_count_accum += (end_time - counting_start_time); | |
214 // Update the total virtual time before doing this, since it will try | |
215 // to measure it to get the vtime for this marking. We purposely | |
216 // neglect the presumably-short "completeCleanup" phase here. | |
217 _vtime_accum = (end_time - _vtime_start); | |
218 if (!cm()->has_aborted()) { | |
219 if (g1_policy->adaptive_young_list_length()) { | |
220 double now = os::elapsedTime(); | |
221 double cleanup_prediction_ms = g1_policy->predict_cleanup_time_ms(); | |
222 jlong sleep_time_ms = mmu_tracker->when_ms(now, cleanup_prediction_ms); | |
223 os::sleep(current_thread, sleep_time_ms, false); | |
224 } | |
225 | |
226 CMCleanUp cl_cl(_cm); | |
227 sprintf(verbose_str, "GC cleanup"); | |
228 VM_CGC_Operation op(&cl_cl, verbose_str); | |
229 VMThread::execute(&op); | |
230 } else { | |
2152 | 231 g1h->set_marking_complete(); |
342 | 232 } |
233 | |
2152 | 234 // Check if cleanup set the free_regions_coming flag. If it |
235 // hasn't, we can just skip the next step. | |
236 if (g1h->free_regions_coming()) { | |
237 // The following will finish freeing up any regions that we | |
238 // found to be empty during cleanup. We'll do this part | |
239 // without joining the suspendible set. If an evacuation pause | |
2361 | 240 // takes place, then we would carry on freeing regions in |
2152 | 241 // case they are needed by the pause. If a Full GC takes |
2361 | 242 // place, it would wait for us to process the regions |
2152 | 243 // reclaimed by cleanup. |
244 | |
342 | 245 double cleanup_start_sec = os::elapsedTime(); |
246 if (PrintGC) { | |
247 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
248 gclog_or_tty->stamp(PrintGCTimeStamps); | |
249 gclog_or_tty->print_cr("[GC concurrent-cleanup-start]"); | |
250 } | |
251 | |
252 // Now do the remainder of the cleanup operation. | |
253 _cm->completeCleanup(); | |
2185 | 254 // Notify anyone who's waiting that there are no more free |
255 // regions coming. We have to do this before we join the STS, | |
256 // otherwise we might deadlock: a GC worker could be blocked | |
257 // waiting for the notification whereas this thread will be | |
258 // blocked for the pause to finish while it's trying to join | |
259 // the STS, which is conditional on the GC workers finishing. | |
260 g1h->reset_free_regions_coming(); | |
261 | |
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262 _sts.join(); |
2152 | 263 g1_policy->record_concurrent_mark_cleanup_completed(); |
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264 _sts.leave(); |
342 | 265 |
2152 | 266 double cleanup_end_sec = os::elapsedTime(); |
267 if (PrintGC) { | |
268 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
269 gclog_or_tty->stamp(PrintGCTimeStamps); | |
270 gclog_or_tty->print_cr("[GC concurrent-cleanup-end, %1.7lf]", | |
271 cleanup_end_sec - cleanup_start_sec); | |
342 | 272 } |
273 } | |
2152 | 274 guarantee(cm()->cleanup_list_is_empty(), |
275 "at this point there should be no regions on the cleanup list"); | |
342 | 276 |
277 if (cm()->has_aborted()) { | |
278 if (PrintGC) { | |
279 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
280 gclog_or_tty->stamp(PrintGCTimeStamps); | |
281 gclog_or_tty->print_cr("[GC concurrent-mark-abort]"); | |
282 } | |
283 } | |
284 | |
285 // we now want to allow clearing of the marking bitmap to be | |
286 // suspended by a collection pause. | |
287 _sts.join(); | |
288 _cm->clearNextBitmap(); | |
289 _sts.leave(); | |
290 } | |
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291 |
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292 // Update the number of full collections that have been |
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293 // completed. This will also notify the FullGCCount_lock in case a |
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294 // Java thread is waiting for a full GC to happen (e.g., it |
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295 // called System.gc() with +ExplicitGCInvokesConcurrent). |
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296 _sts.join(); |
2152 | 297 g1h->increment_full_collections_completed(true /* concurrent */); |
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298 _sts.leave(); |
342 | 299 } |
300 assert(_should_terminate, "just checking"); | |
301 | |
302 terminate(); | |
303 } | |
304 | |
305 | |
306 void ConcurrentMarkThread::yield() { | |
307 _sts.yield("Concurrent Mark"); | |
308 } | |
309 | |
310 void ConcurrentMarkThread::stop() { | |
311 // it is ok to take late safepoints here, if needed | |
312 MutexLockerEx mu(Terminator_lock); | |
313 _should_terminate = true; | |
314 while (!_has_terminated) { | |
315 Terminator_lock->wait(); | |
316 } | |
317 } | |
318 | |
1019 | 319 void ConcurrentMarkThread::print() const { |
320 print_on(tty); | |
321 } | |
322 | |
323 void ConcurrentMarkThread::print_on(outputStream* st) const { | |
324 st->print("\"G1 Main Concurrent Mark GC Thread\" "); | |
325 Thread::print_on(st); | |
326 st->cr(); | |
342 | 327 } |
328 | |
329 void ConcurrentMarkThread::sleepBeforeNextCycle() { | |
330 // We join here because we don't want to do the "shouldConcurrentMark()" | |
331 // below while the world is otherwise stopped. | |
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332 assert(!in_progress(), "should have been cleared"); |
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333 |
342 | 334 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
335 while (!started()) { | |
336 CGC_lock->wait(Mutex::_no_safepoint_check_flag); | |
337 } | |
338 set_in_progress(); | |
339 clear_started(); | |
340 } | |
341 | |
342 // Note: this method, although exported by the ConcurrentMarkSweepThread, | |
343 // which is a non-JavaThread, can only be called by a JavaThread. | |
344 // Currently this is done at vm creation time (post-vm-init) by the | |
345 // main/Primordial (Java)Thread. | |
346 // XXX Consider changing this in the future to allow the CMS thread | |
347 // itself to create this thread? | |
348 void ConcurrentMarkThread::makeSurrogateLockerThread(TRAPS) { | |
349 assert(_slt == NULL, "SLT already created"); | |
350 _slt = SurrogateLockerThread::make(THREAD); | |
351 } |