Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp @ 3960:f08d439fab8c
7089790: integrate bsd-port changes
Reviewed-by: kvn, twisti, jrose
Contributed-by: Kurt Miller <kurt@intricatesoftware.com>, Greg Lewis <glewis@eyesbeyond.com>, Jung-uk Kim <jkim@freebsd.org>, Christos Zoulas <christos@zoulas.com>, Landon Fuller <landonf@plausible.coop>, The FreeBSD Foundation <board@freebsdfoundation.org>, Michael Franz <mvfranz@gmail.com>, Roger Hoover <rhoover@apple.com>, Alexander Strange <astrange@apple.com>
author | never |
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date | Sun, 25 Sep 2011 16:03:29 -0700 |
parents | ff53346271fe |
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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 CMCheckpointRootsFinalClosure: public VoidClosure { | |
54 | |
55 ConcurrentMark* _cm; | |
56 public: | |
57 | |
58 CMCheckpointRootsFinalClosure(ConcurrentMark* cm) : | |
59 _cm(cm) {} | |
60 | |
61 void do_void(){ | |
62 _cm->checkpointRootsFinal(false); // !clear_all_soft_refs | |
63 } | |
64 }; | |
65 | |
66 class CMCleanUp: public VoidClosure { | |
67 ConcurrentMark* _cm; | |
68 public: | |
69 | |
70 CMCleanUp(ConcurrentMark* cm) : | |
71 _cm(cm) {} | |
72 | |
73 void do_void(){ | |
74 _cm->cleanup(); | |
75 } | |
76 }; | |
77 | |
78 | |
79 | |
80 void ConcurrentMarkThread::run() { | |
81 initialize_in_thread(); | |
82 _vtime_start = os::elapsedVTime(); | |
83 wait_for_universe_init(); | |
84 | |
2152 | 85 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
86 G1CollectorPolicy* g1_policy = g1h->g1_policy(); | |
342 | 87 G1MMUTracker *mmu_tracker = g1_policy->mmu_tracker(); |
88 Thread *current_thread = Thread::current(); | |
89 | |
90 while (!_should_terminate) { | |
91 // wait until started is set. | |
92 sleepBeforeNextCycle(); | |
93 { | |
94 ResourceMark rm; | |
95 HandleMark hm; | |
96 double cycle_start = os::elapsedVTime(); | |
97 double mark_start_sec = os::elapsedTime(); | |
98 char verbose_str[128]; | |
99 | |
100 if (PrintGC) { | |
101 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
102 gclog_or_tty->stamp(PrintGCTimeStamps); | |
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103 gclog_or_tty->print_cr("[GC concurrent-mark-start]"); |
342 | 104 } |
105 | |
106 int iter = 0; | |
107 do { | |
108 iter++; | |
109 if (!cm()->has_aborted()) { | |
110 _cm->markFromRoots(); | |
111 } | |
112 | |
113 double mark_end_time = os::elapsedVTime(); | |
114 double mark_end_sec = os::elapsedTime(); | |
115 _vtime_mark_accum += (mark_end_time - cycle_start); | |
116 if (!cm()->has_aborted()) { | |
117 if (g1_policy->adaptive_young_list_length()) { | |
118 double now = os::elapsedTime(); | |
119 double remark_prediction_ms = g1_policy->predict_remark_time_ms(); | |
120 jlong sleep_time_ms = mmu_tracker->when_ms(now, remark_prediction_ms); | |
121 os::sleep(current_thread, sleep_time_ms, false); | |
122 } | |
123 | |
124 if (PrintGC) { | |
125 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
126 gclog_or_tty->stamp(PrintGCTimeStamps); | |
127 gclog_or_tty->print_cr("[GC concurrent-mark-end, %1.7lf sec]", | |
128 mark_end_sec - mark_start_sec); | |
129 } | |
130 | |
131 CMCheckpointRootsFinalClosure final_cl(_cm); | |
132 sprintf(verbose_str, "GC remark"); | |
133 VM_CGC_Operation op(&final_cl, verbose_str); | |
134 VMThread::execute(&op); | |
135 } | |
136 if (cm()->restart_for_overflow() && | |
137 G1TraceMarkStackOverflow) { | |
138 gclog_or_tty->print_cr("Restarting conc marking because of MS overflow " | |
139 "in remark (restart #%d).", iter); | |
140 } | |
141 | |
142 if (cm()->restart_for_overflow()) { | |
143 if (PrintGC) { | |
144 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
145 gclog_or_tty->stamp(PrintGCTimeStamps); | |
146 gclog_or_tty->print_cr("[GC concurrent-mark-restart-for-overflow]"); | |
147 } | |
148 } | |
149 } while (cm()->restart_for_overflow()); | |
150 double counting_start_time = os::elapsedVTime(); | |
151 | |
152 // YSR: These look dubious (i.e. redundant) !!! FIX ME | |
153 slt()->manipulatePLL(SurrogateLockerThread::acquirePLL); | |
154 slt()->manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL); | |
155 | |
156 if (!cm()->has_aborted()) { | |
157 double count_start_sec = os::elapsedTime(); | |
158 if (PrintGC) { | |
159 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
160 gclog_or_tty->stamp(PrintGCTimeStamps); | |
161 gclog_or_tty->print_cr("[GC concurrent-count-start]"); | |
162 } | |
163 | |
164 _sts.join(); | |
165 _cm->calcDesiredRegions(); | |
166 _sts.leave(); | |
167 | |
168 if (!cm()->has_aborted()) { | |
169 double count_end_sec = os::elapsedTime(); | |
170 if (PrintGC) { | |
171 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
172 gclog_or_tty->stamp(PrintGCTimeStamps); | |
173 gclog_or_tty->print_cr("[GC concurrent-count-end, %1.7lf]", | |
174 count_end_sec - count_start_sec); | |
175 } | |
176 } | |
177 } | |
178 double end_time = os::elapsedVTime(); | |
179 _vtime_count_accum += (end_time - counting_start_time); | |
180 // Update the total virtual time before doing this, since it will try | |
181 // to measure it to get the vtime for this marking. We purposely | |
182 // neglect the presumably-short "completeCleanup" phase here. | |
183 _vtime_accum = (end_time - _vtime_start); | |
184 if (!cm()->has_aborted()) { | |
185 if (g1_policy->adaptive_young_list_length()) { | |
186 double now = os::elapsedTime(); | |
187 double cleanup_prediction_ms = g1_policy->predict_cleanup_time_ms(); | |
188 jlong sleep_time_ms = mmu_tracker->when_ms(now, cleanup_prediction_ms); | |
189 os::sleep(current_thread, sleep_time_ms, false); | |
190 } | |
191 | |
192 CMCleanUp cl_cl(_cm); | |
193 sprintf(verbose_str, "GC cleanup"); | |
194 VM_CGC_Operation op(&cl_cl, verbose_str); | |
195 VMThread::execute(&op); | |
196 } else { | |
2152 | 197 g1h->set_marking_complete(); |
342 | 198 } |
199 | |
2152 | 200 // Check if cleanup set the free_regions_coming flag. If it |
201 // hasn't, we can just skip the next step. | |
202 if (g1h->free_regions_coming()) { | |
203 // The following will finish freeing up any regions that we | |
204 // found to be empty during cleanup. We'll do this part | |
205 // without joining the suspendible set. If an evacuation pause | |
2361 | 206 // takes place, then we would carry on freeing regions in |
2152 | 207 // case they are needed by the pause. If a Full GC takes |
2361 | 208 // place, it would wait for us to process the regions |
2152 | 209 // reclaimed by cleanup. |
210 | |
342 | 211 double cleanup_start_sec = os::elapsedTime(); |
212 if (PrintGC) { | |
213 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
214 gclog_or_tty->stamp(PrintGCTimeStamps); | |
215 gclog_or_tty->print_cr("[GC concurrent-cleanup-start]"); | |
216 } | |
217 | |
218 // Now do the remainder of the cleanup operation. | |
219 _cm->completeCleanup(); | |
2185 | 220 // Notify anyone who's waiting that there are no more free |
221 // regions coming. We have to do this before we join the STS, | |
222 // otherwise we might deadlock: a GC worker could be blocked | |
223 // waiting for the notification whereas this thread will be | |
224 // blocked for the pause to finish while it's trying to join | |
225 // the STS, which is conditional on the GC workers finishing. | |
226 g1h->reset_free_regions_coming(); | |
227 | |
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228 _sts.join(); |
2152 | 229 g1_policy->record_concurrent_mark_cleanup_completed(); |
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230 _sts.leave(); |
342 | 231 |
2152 | 232 double cleanup_end_sec = os::elapsedTime(); |
233 if (PrintGC) { | |
234 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
235 gclog_or_tty->stamp(PrintGCTimeStamps); | |
236 gclog_or_tty->print_cr("[GC concurrent-cleanup-end, %1.7lf]", | |
237 cleanup_end_sec - cleanup_start_sec); | |
342 | 238 } |
239 } | |
2152 | 240 guarantee(cm()->cleanup_list_is_empty(), |
241 "at this point there should be no regions on the cleanup list"); | |
342 | 242 |
243 if (cm()->has_aborted()) { | |
244 if (PrintGC) { | |
245 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
246 gclog_or_tty->stamp(PrintGCTimeStamps); | |
247 gclog_or_tty->print_cr("[GC concurrent-mark-abort]"); | |
248 } | |
249 } | |
250 | |
251 // we now want to allow clearing of the marking bitmap to be | |
252 // suspended by a collection pause. | |
253 _sts.join(); | |
254 _cm->clearNextBitmap(); | |
255 _sts.leave(); | |
256 } | |
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257 |
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258 // Update the number of full collections that have been |
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259 // completed. This will also notify the FullGCCount_lock in case a |
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260 // Java thread is waiting for a full GC to happen (e.g., it |
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261 // called System.gc() with +ExplicitGCInvokesConcurrent). |
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262 _sts.join(); |
2152 | 263 g1h->increment_full_collections_completed(true /* concurrent */); |
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264 _sts.leave(); |
342 | 265 } |
266 assert(_should_terminate, "just checking"); | |
267 | |
268 terminate(); | |
269 } | |
270 | |
271 | |
272 void ConcurrentMarkThread::yield() { | |
273 _sts.yield("Concurrent Mark"); | |
274 } | |
275 | |
276 void ConcurrentMarkThread::stop() { | |
277 // it is ok to take late safepoints here, if needed | |
278 MutexLockerEx mu(Terminator_lock); | |
279 _should_terminate = true; | |
280 while (!_has_terminated) { | |
281 Terminator_lock->wait(); | |
282 } | |
283 } | |
284 | |
1019 | 285 void ConcurrentMarkThread::print() const { |
286 print_on(tty); | |
287 } | |
288 | |
289 void ConcurrentMarkThread::print_on(outputStream* st) const { | |
290 st->print("\"G1 Main Concurrent Mark GC Thread\" "); | |
291 Thread::print_on(st); | |
292 st->cr(); | |
342 | 293 } |
294 | |
295 void ConcurrentMarkThread::sleepBeforeNextCycle() { | |
296 // We join here because we don't want to do the "shouldConcurrentMark()" | |
297 // below while the world is otherwise stopped. | |
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298 assert(!in_progress(), "should have been cleared"); |
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299 |
342 | 300 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
301 while (!started()) { | |
302 CGC_lock->wait(Mutex::_no_safepoint_check_flag); | |
303 } | |
304 set_in_progress(); | |
305 clear_started(); | |
306 } | |
307 | |
308 // Note: this method, although exported by the ConcurrentMarkSweepThread, | |
309 // which is a non-JavaThread, can only be called by a JavaThread. | |
310 // Currently this is done at vm creation time (post-vm-init) by the | |
311 // main/Primordial (Java)Thread. | |
312 // XXX Consider changing this in the future to allow the CMS thread | |
313 // itself to create this thread? | |
314 void ConcurrentMarkThread::makeSurrogateLockerThread(TRAPS) { | |
315 assert(_slt == NULL, "SLT already created"); | |
316 _slt = SurrogateLockerThread::make(THREAD); | |
317 } |