Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp @ 21811:22ac20a25842
8055479: TLAB stability
Reviewed-by: brutisso, stefank, ahgross
| author | mgerdin |
|---|---|
| date | Thu, 09 Oct 2014 15:42:23 +0200 |
| parents | 78bbf4d43a14 |
| children | 52b4284cb496 0982ec23da03 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.inline.hpp" | |
| 27 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
| 28 #include "gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp" | |
| 10405 | 29 #include "gc_implementation/shared/gcTimer.hpp" |
| 30 #include "gc_implementation/shared/gcTraceTime.hpp" | |
| 1972 | 31 #include "gc_implementation/shared/isGCActiveMark.hpp" |
| 32 #include "memory/gcLocker.inline.hpp" | |
| 33 #include "runtime/interfaceSupport.hpp" | |
| 10405 | 34 #include "runtime/os.hpp" |
| 1972 | 35 #include "utilities/dtrace.hpp" |
| 4006 | 36 |
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37 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
| 4006 | 38 |
| 39 #ifndef USDT2 | |
| 0 | 40 HS_DTRACE_PROBE_DECL(hs_private, cms__initmark__begin); |
| 41 HS_DTRACE_PROBE_DECL(hs_private, cms__initmark__end); | |
| 42 | |
| 43 HS_DTRACE_PROBE_DECL(hs_private, cms__remark__begin); | |
| 44 HS_DTRACE_PROBE_DECL(hs_private, cms__remark__end); | |
| 4006 | 45 #endif /* !USDT2 */ |
| 0 | 46 |
| 47 ////////////////////////////////////////////////////////// | |
| 48 // Methods in abstract class VM_CMS_Operation | |
| 49 ////////////////////////////////////////////////////////// | |
| 50 void VM_CMS_Operation::acquire_pending_list_lock() { | |
| 51 // The caller may block while communicating | |
| 52 // with the SLT thread in order to acquire/release the PLL. | |
| 53 ConcurrentMarkSweepThread::slt()-> | |
| 54 manipulatePLL(SurrogateLockerThread::acquirePLL); | |
| 55 } | |
| 56 | |
| 57 void VM_CMS_Operation::release_and_notify_pending_list_lock() { | |
| 58 // The caller may block while communicating | |
| 59 // with the SLT thread in order to acquire/release the PLL. | |
| 60 ConcurrentMarkSweepThread::slt()-> | |
| 61 manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL); | |
| 62 } | |
| 63 | |
| 64 void VM_CMS_Operation::verify_before_gc() { | |
| 65 if (VerifyBeforeGC && | |
| 66 GenCollectedHeap::heap()->total_collections() >= VerifyGCStartAt) { | |
| 10405 | 67 GCTraceTime tm("Verify Before", false, false, _collector->_gc_timer_cm); |
| 0 | 68 HandleMark hm; |
| 69 FreelistLocker x(_collector); | |
| 70 MutexLockerEx y(_collector->bitMapLock(), Mutex::_no_safepoint_check_flag); | |
| 71 Universe::heap()->prepare_for_verify(); | |
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72 Universe::verify(); |
| 0 | 73 } |
| 74 } | |
| 75 | |
| 76 void VM_CMS_Operation::verify_after_gc() { | |
| 77 if (VerifyAfterGC && | |
| 78 GenCollectedHeap::heap()->total_collections() >= VerifyGCStartAt) { | |
| 10405 | 79 GCTraceTime tm("Verify After", false, false, _collector->_gc_timer_cm); |
| 0 | 80 HandleMark hm; |
| 81 FreelistLocker x(_collector); | |
| 82 MutexLockerEx y(_collector->bitMapLock(), Mutex::_no_safepoint_check_flag); | |
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83 Universe::verify(); |
| 0 | 84 } |
| 85 } | |
| 86 | |
| 87 bool VM_CMS_Operation::lost_race() const { | |
| 88 if (CMSCollector::abstract_state() == CMSCollector::Idling) { | |
| 89 // We lost a race to a foreground collection | |
| 90 // -- there's nothing to do | |
| 91 return true; | |
| 92 } | |
| 93 assert(CMSCollector::abstract_state() == legal_state(), | |
| 94 "Inconsistent collector state?"); | |
| 95 return false; | |
| 96 } | |
| 97 | |
| 98 bool VM_CMS_Operation::doit_prologue() { | |
| 99 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking"); | |
| 100 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock"); | |
| 101 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(), | |
| 102 "Possible deadlock"); | |
| 103 | |
| 104 if (needs_pll()) { | |
| 105 acquire_pending_list_lock(); | |
| 106 } | |
| 107 // Get the Heap_lock after the pending_list_lock. | |
| 108 Heap_lock->lock(); | |
| 109 if (lost_race()) { | |
| 110 assert(_prologue_succeeded == false, "Initialized in c'tor"); | |
| 111 Heap_lock->unlock(); | |
| 112 if (needs_pll()) { | |
| 113 release_and_notify_pending_list_lock(); | |
| 114 } | |
| 115 } else { | |
| 116 _prologue_succeeded = true; | |
| 117 } | |
| 118 return _prologue_succeeded; | |
| 119 } | |
| 120 | |
| 121 void VM_CMS_Operation::doit_epilogue() { | |
| 122 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking"); | |
| 123 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock"); | |
| 124 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(), | |
| 125 "Possible deadlock"); | |
| 126 | |
| 127 // Release the Heap_lock first. | |
| 128 Heap_lock->unlock(); | |
| 129 if (needs_pll()) { | |
| 130 release_and_notify_pending_list_lock(); | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 ////////////////////////////////////////////////////////// | |
| 135 // Methods in class VM_CMS_Initial_Mark | |
| 136 ////////////////////////////////////////////////////////// | |
| 137 void VM_CMS_Initial_Mark::doit() { | |
| 138 if (lost_race()) { | |
| 139 // Nothing to do. | |
| 140 return; | |
| 141 } | |
| 4006 | 142 #ifndef USDT2 |
| 0 | 143 HS_DTRACE_PROBE(hs_private, cms__initmark__begin); |
| 4006 | 144 #else /* USDT2 */ |
| 145 HS_PRIVATE_CMS_INITMARK_BEGIN( | |
| 146 ); | |
| 147 #endif /* USDT2 */ | |
| 0 | 148 |
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149 _collector->_gc_timer_cm->register_gc_pause_start("Initial Mark"); |
| 10405 | 150 |
| 0 | 151 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
| 152 GCCauseSetter gccs(gch, GCCause::_cms_initial_mark); | |
| 153 | |
| 154 VM_CMS_Operation::verify_before_gc(); | |
| 155 | |
| 156 IsGCActiveMark x; // stop-world GC active | |
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157 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsInitial, gch->gc_cause()); |
| 0 | 158 |
| 159 VM_CMS_Operation::verify_after_gc(); | |
| 10405 | 160 |
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161 _collector->_gc_timer_cm->register_gc_pause_end(); |
| 10405 | 162 |
| 4006 | 163 #ifndef USDT2 |
| 0 | 164 HS_DTRACE_PROBE(hs_private, cms__initmark__end); |
| 4006 | 165 #else /* USDT2 */ |
| 166 HS_PRIVATE_CMS_INITMARK_END( | |
| 167 ); | |
| 168 #endif /* USDT2 */ | |
| 0 | 169 } |
| 170 | |
| 171 ////////////////////////////////////////////////////////// | |
| 172 // Methods in class VM_CMS_Final_Remark_Operation | |
| 173 ////////////////////////////////////////////////////////// | |
| 174 void VM_CMS_Final_Remark::doit() { | |
| 175 if (lost_race()) { | |
| 176 // Nothing to do. | |
| 177 return; | |
| 178 } | |
| 4006 | 179 #ifndef USDT2 |
| 0 | 180 HS_DTRACE_PROBE(hs_private, cms__remark__begin); |
| 4006 | 181 #else /* USDT2 */ |
| 182 HS_PRIVATE_CMS_REMARK_BEGIN( | |
| 183 ); | |
| 184 #endif /* USDT2 */ | |
| 0 | 185 |
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186 _collector->_gc_timer_cm->register_gc_pause_start("Final Mark"); |
| 10405 | 187 |
| 0 | 188 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
| 189 GCCauseSetter gccs(gch, GCCause::_cms_final_remark); | |
| 190 | |
| 191 VM_CMS_Operation::verify_before_gc(); | |
| 192 | |
| 193 IsGCActiveMark x; // stop-world GC active | |
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194 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsFinal, gch->gc_cause()); |
| 0 | 195 |
| 196 VM_CMS_Operation::verify_after_gc(); | |
| 10405 | 197 |
| 198 _collector->save_heap_summary(); | |
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199 _collector->_gc_timer_cm->register_gc_pause_end(); |
| 10405 | 200 |
| 4006 | 201 #ifndef USDT2 |
| 0 | 202 HS_DTRACE_PROBE(hs_private, cms__remark__end); |
| 4006 | 203 #else /* USDT2 */ |
| 204 HS_PRIVATE_CMS_REMARK_END( | |
| 205 ); | |
| 206 #endif /* USDT2 */ | |
| 0 | 207 } |
| 208 | |
| 209 // VM operation to invoke a concurrent collection of a | |
| 210 // GenCollectedHeap heap. | |
| 211 void VM_GenCollectFullConcurrent::doit() { | |
| 212 assert(Thread::current()->is_VM_thread(), "Should be VM thread"); | |
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213 assert(GCLockerInvokesConcurrent || ExplicitGCInvokesConcurrent, "Unexpected"); |
| 0 | 214 |
| 215 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 216 if (_gc_count_before == gch->total_collections()) { | |
| 217 // The "full" of do_full_collection call below "forces" | |
| 218 // a collection; the second arg, 0, below ensures that | |
| 219 // only the young gen is collected. XXX In the future, | |
| 220 // we'll probably need to have something in this interface | |
| 221 // to say do this only if we are sure we will not bail | |
| 222 // out to a full collection in this attempt, but that's | |
| 223 // for the future. | |
| 224 assert(SafepointSynchronize::is_at_safepoint(), | |
| 225 "We can only be executing this arm of if at a safepoint"); | |
| 226 GCCauseSetter gccs(gch, _gc_cause); | |
| 227 gch->do_full_collection(gch->must_clear_all_soft_refs(), | |
| 228 0 /* collect only youngest gen */); | |
| 229 } // Else no need for a foreground young gc | |
| 230 assert((_gc_count_before < gch->total_collections()) || | |
| 231 (GC_locker::is_active() /* gc may have been skipped */ | |
| 232 && (_gc_count_before == gch->total_collections())), | |
| 233 "total_collections() should be monotonically increasing"); | |
| 234 | |
| 235 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
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236 assert(_full_gc_count_before <= gch->total_full_collections(), "Error"); |
| 0 | 237 if (gch->total_full_collections() == _full_gc_count_before) { |
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238 // Disable iCMS until the full collection is done, and |
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239 // remember that we did so. |
| 0 | 240 CMSCollector::disable_icms(); |
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241 _disabled_icms = true; |
| 0 | 242 // In case CMS thread was in icms_wait(), wake it up. |
| 243 CMSCollector::start_icms(); | |
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244 // Nudge the CMS thread to start a concurrent collection. |
| 10405 | 245 CMSCollector::request_full_gc(_full_gc_count_before, _gc_cause); |
| 0 | 246 } else { |
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247 assert(_full_gc_count_before < gch->total_full_collections(), "Error"); |
| 0 | 248 FullGCCount_lock->notify_all(); // Inform the Java thread its work is done |
| 249 } | |
| 250 } | |
| 251 | |
| 252 bool VM_GenCollectFullConcurrent::evaluate_at_safepoint() const { | |
| 253 Thread* thr = Thread::current(); | |
| 254 assert(thr != NULL, "Unexpected tid"); | |
| 255 if (!thr->is_Java_thread()) { | |
| 256 assert(thr->is_VM_thread(), "Expected to be evaluated by VM thread"); | |
| 257 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 258 if (_gc_count_before != gch->total_collections()) { | |
| 259 // No need to do a young gc, we'll just nudge the CMS thread | |
| 260 // in the doit() method above, to be executed soon. | |
| 261 assert(_gc_count_before < gch->total_collections(), | |
| 262 "total_collections() should be monotnically increasing"); | |
| 263 return false; // no need for foreground young gc | |
| 264 } | |
| 265 } | |
| 266 return true; // may still need foreground young gc | |
| 267 } | |
| 268 | |
| 269 | |
| 270 void VM_GenCollectFullConcurrent::doit_epilogue() { | |
| 271 Thread* thr = Thread::current(); | |
| 272 assert(thr->is_Java_thread(), "just checking"); | |
| 273 JavaThread* jt = (JavaThread*)thr; | |
| 274 // Release the Heap_lock first. | |
| 275 Heap_lock->unlock(); | |
| 276 release_and_notify_pending_list_lock(); | |
| 277 | |
| 278 // It is fine to test whether completed collections has | |
| 279 // exceeded our request count without locking because | |
| 280 // the completion count is monotonically increasing; | |
| 281 // this will break for very long-running apps when the | |
| 282 // count overflows and wraps around. XXX fix me !!! | |
| 283 // e.g. at the rate of 1 full gc per ms, this could | |
| 284 // overflow in about 1000 years. | |
| 285 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
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286 if (_gc_cause != GCCause::_gc_locker && |
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287 gch->total_full_collections_completed() <= _full_gc_count_before) { |
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288 // maybe we should change the condition to test _gc_cause == |
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289 // GCCause::_java_lang_system_gc, instead of |
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290 // _gc_cause != GCCause::_gc_locker |
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291 assert(_gc_cause == GCCause::_java_lang_system_gc, |
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292 "the only way to get here if this was a System.gc()-induced GC"); |
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293 assert(ExplicitGCInvokesConcurrent, "Error"); |
| 0 | 294 // Now, wait for witnessing concurrent gc cycle to complete, |
| 295 // but do so in native mode, because we want to lock the | |
| 296 // FullGCEvent_lock, which may be needed by the VM thread | |
| 297 // or by the CMS thread, so we do not want to be suspended | |
| 298 // while holding that lock. | |
| 299 ThreadToNativeFromVM native(jt); | |
| 300 MutexLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
| 301 // Either a concurrent or a stop-world full gc is sufficient | |
| 302 // witness to our request. | |
| 303 while (gch->total_full_collections_completed() <= _full_gc_count_before) { | |
| 304 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 305 } | |
| 306 } | |
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307 // Enable iCMS back if we disabled it earlier. |
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308 if (_disabled_icms) { |
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309 CMSCollector::enable_icms(); |
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310 } |
| 0 | 311 } |