Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp @ 2361:1216415d8e35
7014923: G1: code cleanup
Summary: Some G1 code cleanup.
Reviewed-by: johnc, jcoomes, jwilhelm
| author | tonyp |
|---|---|
| date | Fri, 04 Mar 2011 17:13:19 -0500 |
| parents | b7a938236e43 |
| children | ff53346271fe |
| 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 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 } |