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comparison src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp @ 342:37f87013dfd8

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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
date Thu, 05 Jun 2008 15:57:56 -0700
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children 7ea5ca260b28
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189:0b27f3512f9e 342:37f87013dfd8
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 }