Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp @ 8094:f1fb03a251e9
8008546: Wrong G1ConfidencePercent results in GUARANTEE(VARIANCE() > -1.0) FAILED
Reviewed-by: brutisso, johnc
Contributed-by: vladimir.kempik@oracle.com
author | poonam |
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date | Thu, 21 Feb 2013 23:58:05 -0800 |
parents | d275c3dc73e6 |
children | 96c885895d22 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, 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" | |
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29 #include "gc_implementation/g1/g1Log.hpp" |
1972 | 30 #include "gc_implementation/g1/g1MMUTracker.hpp" |
31 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
32 #include "memory/resourceArea.hpp" | |
33 #include "runtime/vmThread.hpp" | |
342 | 34 |
35 // ======= Concurrent Mark Thread ======== | |
36 | |
37 // The CM thread is created when the G1 garbage collector is used | |
38 | |
39 SurrogateLockerThread* | |
40 ConcurrentMarkThread::_slt = NULL; | |
41 | |
42 ConcurrentMarkThread::ConcurrentMarkThread(ConcurrentMark* cm) : | |
43 ConcurrentGCThread(), | |
44 _cm(cm), | |
45 _started(false), | |
46 _in_progress(false), | |
47 _vtime_accum(0.0), | |
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48 _vtime_mark_accum(0.0) { |
342 | 49 create_and_start(); |
50 } | |
51 | |
52 class CMCheckpointRootsFinalClosure: public VoidClosure { | |
53 | |
54 ConcurrentMark* _cm; | |
55 public: | |
56 | |
57 CMCheckpointRootsFinalClosure(ConcurrentMark* cm) : | |
58 _cm(cm) {} | |
59 | |
60 void do_void(){ | |
61 _cm->checkpointRootsFinal(false); // !clear_all_soft_refs | |
62 } | |
63 }; | |
64 | |
65 class CMCleanUp: public VoidClosure { | |
66 ConcurrentMark* _cm; | |
67 public: | |
68 | |
69 CMCleanUp(ConcurrentMark* cm) : | |
70 _cm(cm) {} | |
71 | |
72 void do_void(){ | |
73 _cm->cleanup(); | |
74 } | |
75 }; | |
76 | |
77 | |
78 | |
79 void ConcurrentMarkThread::run() { | |
80 initialize_in_thread(); | |
81 _vtime_start = os::elapsedVTime(); | |
82 wait_for_universe_init(); | |
83 | |
2152 | 84 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
85 G1CollectorPolicy* g1_policy = g1h->g1_policy(); | |
342 | 86 G1MMUTracker *mmu_tracker = g1_policy->mmu_tracker(); |
87 Thread *current_thread = Thread::current(); | |
88 | |
89 while (!_should_terminate) { | |
90 // wait until started is set. | |
91 sleepBeforeNextCycle(); | |
92 { | |
93 ResourceMark rm; | |
94 HandleMark hm; | |
95 double cycle_start = os::elapsedVTime(); | |
96 char verbose_str[128]; | |
97 | |
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98 // We have to ensure that we finish scanning the root regions |
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99 // before the next GC takes place. To ensure this we have to |
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100 // make sure that we do not join the STS until the root regions |
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101 // have been scanned. If we did then it's possible that a |
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102 // subsequent GC could block us from joining the STS and proceed |
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103 // without the root regions have been scanned which would be a |
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104 // correctness issue. |
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105 |
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106 double scan_start = os::elapsedTime(); |
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107 if (!cm()->has_aborted()) { |
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108 if (G1Log::fine()) { |
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109 gclog_or_tty->date_stamp(PrintGCDateStamps); |
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110 gclog_or_tty->stamp(PrintGCTimeStamps); |
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111 gclog_or_tty->print_cr("[GC concurrent-root-region-scan-start]"); |
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112 } |
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113 |
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114 _cm->scanRootRegions(); |
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115 |
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116 double scan_end = os::elapsedTime(); |
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117 if (G1Log::fine()) { |
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118 gclog_or_tty->date_stamp(PrintGCDateStamps); |
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119 gclog_or_tty->stamp(PrintGCTimeStamps); |
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120 gclog_or_tty->print_cr("[GC concurrent-root-region-scan-end, %1.7lf]", |
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121 scan_end - scan_start); |
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122 } |
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123 } |
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124 |
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125 double mark_start_sec = os::elapsedTime(); |
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126 if (G1Log::fine()) { |
342 | 127 gclog_or_tty->date_stamp(PrintGCDateStamps); |
128 gclog_or_tty->stamp(PrintGCTimeStamps); | |
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129 gclog_or_tty->print_cr("[GC concurrent-mark-start]"); |
342 | 130 } |
131 | |
132 int iter = 0; | |
133 do { | |
134 iter++; | |
135 if (!cm()->has_aborted()) { | |
136 _cm->markFromRoots(); | |
137 } | |
138 | |
139 double mark_end_time = os::elapsedVTime(); | |
140 double mark_end_sec = os::elapsedTime(); | |
141 _vtime_mark_accum += (mark_end_time - cycle_start); | |
142 if (!cm()->has_aborted()) { | |
143 if (g1_policy->adaptive_young_list_length()) { | |
144 double now = os::elapsedTime(); | |
145 double remark_prediction_ms = g1_policy->predict_remark_time_ms(); | |
146 jlong sleep_time_ms = mmu_tracker->when_ms(now, remark_prediction_ms); | |
147 os::sleep(current_thread, sleep_time_ms, false); | |
148 } | |
149 | |
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150 if (G1Log::fine()) { |
342 | 151 gclog_or_tty->date_stamp(PrintGCDateStamps); |
152 gclog_or_tty->stamp(PrintGCTimeStamps); | |
153 gclog_or_tty->print_cr("[GC concurrent-mark-end, %1.7lf sec]", | |
154 mark_end_sec - mark_start_sec); | |
155 } | |
156 | |
157 CMCheckpointRootsFinalClosure final_cl(_cm); | |
158 sprintf(verbose_str, "GC remark"); | |
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159 VM_CGC_Operation op(&final_cl, verbose_str, true /* needs_pll */); |
342 | 160 VMThread::execute(&op); |
161 } | |
162 if (cm()->restart_for_overflow()) { | |
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163 if (G1TraceMarkStackOverflow) { |
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164 gclog_or_tty->print_cr("Restarting conc marking because of MS overflow " |
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165 "in remark (restart #%d).", iter); |
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166 } |
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167 if (G1Log::fine()) { |
342 | 168 gclog_or_tty->date_stamp(PrintGCDateStamps); |
169 gclog_or_tty->stamp(PrintGCTimeStamps); | |
170 gclog_or_tty->print_cr("[GC concurrent-mark-restart-for-overflow]"); | |
171 } | |
172 } | |
173 } while (cm()->restart_for_overflow()); | |
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174 |
342 | 175 double end_time = os::elapsedVTime(); |
176 // Update the total virtual time before doing this, since it will try | |
177 // to measure it to get the vtime for this marking. We purposely | |
178 // neglect the presumably-short "completeCleanup" phase here. | |
179 _vtime_accum = (end_time - _vtime_start); | |
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180 |
342 | 181 if (!cm()->has_aborted()) { |
182 if (g1_policy->adaptive_young_list_length()) { | |
183 double now = os::elapsedTime(); | |
184 double cleanup_prediction_ms = g1_policy->predict_cleanup_time_ms(); | |
185 jlong sleep_time_ms = mmu_tracker->when_ms(now, cleanup_prediction_ms); | |
186 os::sleep(current_thread, sleep_time_ms, false); | |
187 } | |
188 | |
189 CMCleanUp cl_cl(_cm); | |
190 sprintf(verbose_str, "GC cleanup"); | |
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191 VM_CGC_Operation op(&cl_cl, verbose_str, false /* needs_pll */); |
342 | 192 VMThread::execute(&op); |
193 } else { | |
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194 // We don't want to update the marking status if a GC pause |
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195 // is already underway. |
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196 _sts.join(); |
2152 | 197 g1h->set_marking_complete(); |
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198 _sts.leave(); |
342 | 199 } |
200 | |
2152 | 201 // Check if cleanup set the free_regions_coming flag. If it |
202 // hasn't, we can just skip the next step. | |
203 if (g1h->free_regions_coming()) { | |
204 // The following will finish freeing up any regions that we | |
205 // found to be empty during cleanup. We'll do this part | |
206 // without joining the suspendible set. If an evacuation pause | |
2361 | 207 // takes place, then we would carry on freeing regions in |
2152 | 208 // case they are needed by the pause. If a Full GC takes |
2361 | 209 // place, it would wait for us to process the regions |
2152 | 210 // reclaimed by cleanup. |
211 | |
342 | 212 double cleanup_start_sec = os::elapsedTime(); |
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213 if (G1Log::fine()) { |
342 | 214 gclog_or_tty->date_stamp(PrintGCDateStamps); |
215 gclog_or_tty->stamp(PrintGCTimeStamps); | |
216 gclog_or_tty->print_cr("[GC concurrent-cleanup-start]"); | |
217 } | |
218 | |
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219 // Now do the concurrent cleanup operation. |
342 | 220 _cm->completeCleanup(); |
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221 |
2185 | 222 // Notify anyone who's waiting that there are no more free |
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223 // regions coming. We have to do this before we join the STS |
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224 // (in fact, we should not attempt to join the STS in the |
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225 // interval between finishing the cleanup pause and clearing |
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226 // the free_regions_coming flag) otherwise we might deadlock: |
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227 // a GC worker could be blocked waiting for the notification |
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228 // whereas this thread will be blocked for the pause to finish |
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229 // while it's trying to join the STS, which is conditional on |
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230 // the GC workers finishing. |
2185 | 231 g1h->reset_free_regions_coming(); |
232 | |
2152 | 233 double cleanup_end_sec = os::elapsedTime(); |
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234 if (G1Log::fine()) { |
2152 | 235 gclog_or_tty->date_stamp(PrintGCDateStamps); |
236 gclog_or_tty->stamp(PrintGCTimeStamps); | |
237 gclog_or_tty->print_cr("[GC concurrent-cleanup-end, %1.7lf]", | |
238 cleanup_end_sec - cleanup_start_sec); | |
342 | 239 } |
240 } | |
2152 | 241 guarantee(cm()->cleanup_list_is_empty(), |
242 "at this point there should be no regions on the cleanup list"); | |
342 | 243 |
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244 // There is a tricky race before recording that the concurrent |
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245 // cleanup has completed and a potential Full GC starting around |
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246 // the same time. We want to make sure that the Full GC calls |
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247 // abort() on concurrent mark after |
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248 // record_concurrent_mark_cleanup_completed(), since abort() is |
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249 // the method that will reset the concurrent mark state. If we |
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250 // end up calling record_concurrent_mark_cleanup_completed() |
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251 // after abort() then we might incorrectly undo some of the work |
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252 // abort() did. Checking the has_aborted() flag after joining |
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253 // the STS allows the correct ordering of the two methods. There |
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254 // are two scenarios: |
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255 // |
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256 // a) If we reach here before the Full GC, the fact that we have |
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257 // joined the STS means that the Full GC cannot start until we |
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258 // leave the STS, so record_concurrent_mark_cleanup_completed() |
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259 // will complete before abort() is called. |
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260 // |
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261 // b) If we reach here during the Full GC, we'll be held up from |
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262 // joining the STS until the Full GC is done, which means that |
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263 // abort() will have completed and has_aborted() will return |
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264 // true to prevent us from calling |
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265 // record_concurrent_mark_cleanup_completed() (and, in fact, it's |
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266 // not needed any more as the concurrent mark state has been |
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267 // already reset). |
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268 _sts.join(); |
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269 if (!cm()->has_aborted()) { |
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270 g1_policy->record_concurrent_mark_cleanup_completed(); |
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271 } |
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272 _sts.leave(); |
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273 |
342 | 274 if (cm()->has_aborted()) { |
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275 if (G1Log::fine()) { |
342 | 276 gclog_or_tty->date_stamp(PrintGCDateStamps); |
277 gclog_or_tty->stamp(PrintGCTimeStamps); | |
278 gclog_or_tty->print_cr("[GC concurrent-mark-abort]"); | |
279 } | |
280 } | |
281 | |
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282 // We now want to allow clearing of the marking bitmap to be |
342 | 283 // suspended by a collection pause. |
284 _sts.join(); | |
285 _cm->clearNextBitmap(); | |
286 _sts.leave(); | |
287 } | |
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288 |
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289 // Update the number of full collections that have been |
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290 // completed. This will also notify the FullGCCount_lock in case a |
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291 // Java thread is waiting for a full GC to happen (e.g., it |
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292 // called System.gc() with +ExplicitGCInvokesConcurrent). |
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293 _sts.join(); |
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294 g1h->increment_old_marking_cycles_completed(true /* concurrent */); |
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295 _sts.leave(); |
342 | 296 } |
297 assert(_should_terminate, "just checking"); | |
298 | |
299 terminate(); | |
300 } | |
301 | |
302 | |
303 void ConcurrentMarkThread::yield() { | |
304 _sts.yield("Concurrent Mark"); | |
305 } | |
306 | |
307 void ConcurrentMarkThread::stop() { | |
308 // it is ok to take late safepoints here, if needed | |
309 MutexLockerEx mu(Terminator_lock); | |
310 _should_terminate = true; | |
311 while (!_has_terminated) { | |
312 Terminator_lock->wait(); | |
313 } | |
314 } | |
315 | |
1019 | 316 void ConcurrentMarkThread::print() const { |
317 print_on(tty); | |
318 } | |
319 | |
320 void ConcurrentMarkThread::print_on(outputStream* st) const { | |
321 st->print("\"G1 Main Concurrent Mark GC Thread\" "); | |
322 Thread::print_on(st); | |
323 st->cr(); | |
342 | 324 } |
325 | |
326 void ConcurrentMarkThread::sleepBeforeNextCycle() { | |
327 // We join here because we don't want to do the "shouldConcurrentMark()" | |
328 // below while the world is otherwise stopped. | |
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329 assert(!in_progress(), "should have been cleared"); |
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330 |
342 | 331 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
332 while (!started()) { | |
333 CGC_lock->wait(Mutex::_no_safepoint_check_flag); | |
334 } | |
335 set_in_progress(); | |
336 clear_started(); | |
337 } | |
338 | |
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339 // Note: As is the case with CMS - this method, although exported |
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340 // by the ConcurrentMarkThread, which is a non-JavaThread, can only |
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341 // be called by a JavaThread. Currently this is done at vm creation |
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342 // time (post-vm-init) by the main/Primordial (Java)Thread. |
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343 // XXX Consider changing this in the future to allow the CM thread |
342 | 344 // itself to create this thread? |
345 void ConcurrentMarkThread::makeSurrogateLockerThread(TRAPS) { | |
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346 assert(UseG1GC, "SLT thread needed only for concurrent GC"); |
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347 assert(THREAD->is_Java_thread(), "must be a Java thread"); |
342 | 348 assert(_slt == NULL, "SLT already created"); |
349 _slt = SurrogateLockerThread::make(THREAD); | |
350 } |