Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp @ 4012:ec4b032a4977
7098085: G1: partially-young GCs not initiated under certain circumstances
Reviewed-by: ysr, brutisso
| author | tonyp |
|---|---|
| date | Thu, 13 Oct 2011 13:54:29 -0400 |
| parents | ff53346271fe |
| children | db89aa49298f |
| rev | line source |
|---|---|
| 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 | |
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218 // Now do the concurrent cleanup operation. |
| 342 | 219 _cm->completeCleanup(); |
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220 |
| 2185 | 221 // Notify anyone who's waiting that there are no more free |
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222 // regions coming. We have to do this before we join the STS |
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223 // (in fact, we should not attempt to join the STS in the |
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224 // interval between finishing the cleanup pause and clearing |
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225 // the free_regions_coming flag) otherwise we might deadlock: |
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226 // a GC worker could be blocked waiting for the notification |
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227 // whereas this thread will be blocked for the pause to finish |
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228 // while it's trying to join the STS, which is conditional on |
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229 // the GC workers finishing. |
| 2185 | 230 g1h->reset_free_regions_coming(); |
| 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 |
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243 // There is a tricky race before recording that the concurrent |
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244 // cleanup has completed and a potential Full GC starting around |
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245 // the same time. We want to make sure that the Full GC calls |
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246 // abort() on concurrent mark after |
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247 // record_concurrent_mark_cleanup_completed(), since abort() is |
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248 // the method that will reset the concurrent mark state. If we |
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249 // end up calling record_concurrent_mark_cleanup_completed() |
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250 // after abort() then we might incorrectly undo some of the work |
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251 // abort() did. Checking the has_aborted() flag after joining |
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252 // the STS allows the correct ordering of the two methods. There |
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253 // are two scenarios: |
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254 // |
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255 // a) If we reach here before the Full GC, the fact that we have |
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256 // joined the STS means that the Full GC cannot start until we |
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257 // leave the STS, so record_concurrent_mark_cleanup_completed() |
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258 // will complete before abort() is called. |
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259 // |
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260 // b) If we reach here during the Full GC, we'll be held up from |
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261 // joining the STS until the Full GC is done, which means that |
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262 // abort() will have completed and has_aborted() will return |
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263 // true to prevent us from calling |
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264 // record_concurrent_mark_cleanup_completed() (and, in fact, it's |
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265 // not needed any more as the concurrent mark state has been |
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266 // already reset). |
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267 _sts.join(); |
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268 if (!cm()->has_aborted()) { |
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269 g1_policy->record_concurrent_mark_cleanup_completed(); |
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270 } |
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271 _sts.leave(); |
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272 |
| 342 | 273 if (cm()->has_aborted()) { |
| 274 if (PrintGC) { | |
| 275 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
| 276 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 277 gclog_or_tty->print_cr("[GC concurrent-mark-abort]"); | |
| 278 } | |
| 279 } | |
| 280 | |
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281 // We now want to allow clearing of the marking bitmap to be |
| 342 | 282 // suspended by a collection pause. |
| 283 _sts.join(); | |
| 284 _cm->clearNextBitmap(); | |
| 285 _sts.leave(); | |
| 286 } | |
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287 |
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288 // Update the number of full collections that have been |
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289 // completed. This will also notify the FullGCCount_lock in case a |
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290 // Java thread is waiting for a full GC to happen (e.g., it |
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291 // called System.gc() with +ExplicitGCInvokesConcurrent). |
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292 _sts.join(); |
| 2152 | 293 g1h->increment_full_collections_completed(true /* concurrent */); |
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294 _sts.leave(); |
| 342 | 295 } |
| 296 assert(_should_terminate, "just checking"); | |
| 297 | |
| 298 terminate(); | |
| 299 } | |
| 300 | |
| 301 | |
| 302 void ConcurrentMarkThread::yield() { | |
| 303 _sts.yield("Concurrent Mark"); | |
| 304 } | |
| 305 | |
| 306 void ConcurrentMarkThread::stop() { | |
| 307 // it is ok to take late safepoints here, if needed | |
| 308 MutexLockerEx mu(Terminator_lock); | |
| 309 _should_terminate = true; | |
| 310 while (!_has_terminated) { | |
| 311 Terminator_lock->wait(); | |
| 312 } | |
| 313 } | |
| 314 | |
| 1019 | 315 void ConcurrentMarkThread::print() const { |
| 316 print_on(tty); | |
| 317 } | |
| 318 | |
| 319 void ConcurrentMarkThread::print_on(outputStream* st) const { | |
| 320 st->print("\"G1 Main Concurrent Mark GC Thread\" "); | |
| 321 Thread::print_on(st); | |
| 322 st->cr(); | |
| 342 | 323 } |
| 324 | |
| 325 void ConcurrentMarkThread::sleepBeforeNextCycle() { | |
| 326 // We join here because we don't want to do the "shouldConcurrentMark()" | |
| 327 // below while the world is otherwise stopped. | |
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328 assert(!in_progress(), "should have been cleared"); |
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329 |
| 342 | 330 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
| 331 while (!started()) { | |
| 332 CGC_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 333 } | |
| 334 set_in_progress(); | |
| 335 clear_started(); | |
| 336 } | |
| 337 | |
| 338 // Note: this method, although exported by the ConcurrentMarkSweepThread, | |
| 339 // which is a non-JavaThread, can only be called by a JavaThread. | |
| 340 // Currently this is done at vm creation time (post-vm-init) by the | |
| 341 // main/Primordial (Java)Thread. | |
| 342 // XXX Consider changing this in the future to allow the CMS thread | |
| 343 // itself to create this thread? | |
| 344 void ConcurrentMarkThread::makeSurrogateLockerThread(TRAPS) { | |
| 345 assert(_slt == NULL, "SLT already created"); | |
| 346 _slt = SurrogateLockerThread::make(THREAD); | |
| 347 } |