Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp @ 10405:f2110083203d
8005849: JEP 167: Event-Based JVM Tracing
Reviewed-by: acorn, coleenp, sla
Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>
| author | sla |
|---|---|
| date | Mon, 10 Jun 2013 11:30:51 +0200 |
| parents | 633ba56cb013 |
| children | 86e6d691f2e1 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 10405 | 2 * Copyright (c) 2005, 2013, 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 |
| 37 | |
| 38 #ifndef USDT2 | |
| 0 | 39 HS_DTRACE_PROBE_DECL(hs_private, cms__initmark__begin); |
| 40 HS_DTRACE_PROBE_DECL(hs_private, cms__initmark__end); | |
| 41 | |
| 42 HS_DTRACE_PROBE_DECL(hs_private, cms__remark__begin); | |
| 43 HS_DTRACE_PROBE_DECL(hs_private, cms__remark__end); | |
| 4006 | 44 #endif /* !USDT2 */ |
| 0 | 45 |
| 46 ////////////////////////////////////////////////////////// | |
| 47 // Methods in abstract class VM_CMS_Operation | |
| 48 ////////////////////////////////////////////////////////// | |
| 49 void VM_CMS_Operation::acquire_pending_list_lock() { | |
| 50 // The caller may block while communicating | |
| 51 // with the SLT thread in order to acquire/release the PLL. | |
| 52 ConcurrentMarkSweepThread::slt()-> | |
| 53 manipulatePLL(SurrogateLockerThread::acquirePLL); | |
| 54 } | |
| 55 | |
| 56 void VM_CMS_Operation::release_and_notify_pending_list_lock() { | |
| 57 // The caller may block while communicating | |
| 58 // with the SLT thread in order to acquire/release the PLL. | |
| 59 ConcurrentMarkSweepThread::slt()-> | |
| 60 manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL); | |
| 61 } | |
| 62 | |
| 63 void VM_CMS_Operation::verify_before_gc() { | |
| 64 if (VerifyBeforeGC && | |
| 65 GenCollectedHeap::heap()->total_collections() >= VerifyGCStartAt) { | |
| 10405 | 66 GCTraceTime tm("Verify Before", false, false, _collector->_gc_timer_cm); |
| 0 | 67 HandleMark hm; |
| 68 FreelistLocker x(_collector); | |
| 69 MutexLockerEx y(_collector->bitMapLock(), Mutex::_no_safepoint_check_flag); | |
| 70 Universe::heap()->prepare_for_verify(); | |
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71 Universe::verify(); |
| 0 | 72 } |
| 73 } | |
| 74 | |
| 75 void VM_CMS_Operation::verify_after_gc() { | |
| 76 if (VerifyAfterGC && | |
| 77 GenCollectedHeap::heap()->total_collections() >= VerifyGCStartAt) { | |
| 10405 | 78 GCTraceTime tm("Verify After", false, false, _collector->_gc_timer_cm); |
| 0 | 79 HandleMark hm; |
| 80 FreelistLocker x(_collector); | |
| 81 MutexLockerEx y(_collector->bitMapLock(), Mutex::_no_safepoint_check_flag); | |
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82 Universe::verify(); |
| 0 | 83 } |
| 84 } | |
| 85 | |
| 86 bool VM_CMS_Operation::lost_race() const { | |
| 87 if (CMSCollector::abstract_state() == CMSCollector::Idling) { | |
| 88 // We lost a race to a foreground collection | |
| 89 // -- there's nothing to do | |
| 90 return true; | |
| 91 } | |
| 92 assert(CMSCollector::abstract_state() == legal_state(), | |
| 93 "Inconsistent collector state?"); | |
| 94 return false; | |
| 95 } | |
| 96 | |
| 97 bool VM_CMS_Operation::doit_prologue() { | |
| 98 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking"); | |
| 99 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock"); | |
| 100 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(), | |
| 101 "Possible deadlock"); | |
| 102 | |
| 103 if (needs_pll()) { | |
| 104 acquire_pending_list_lock(); | |
| 105 } | |
| 106 // Get the Heap_lock after the pending_list_lock. | |
| 107 Heap_lock->lock(); | |
| 108 if (lost_race()) { | |
| 109 assert(_prologue_succeeded == false, "Initialized in c'tor"); | |
| 110 Heap_lock->unlock(); | |
| 111 if (needs_pll()) { | |
| 112 release_and_notify_pending_list_lock(); | |
| 113 } | |
| 114 } else { | |
| 115 _prologue_succeeded = true; | |
| 116 } | |
| 117 return _prologue_succeeded; | |
| 118 } | |
| 119 | |
| 120 void VM_CMS_Operation::doit_epilogue() { | |
| 121 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking"); | |
| 122 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock"); | |
| 123 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(), | |
| 124 "Possible deadlock"); | |
| 125 | |
| 126 // Release the Heap_lock first. | |
| 127 Heap_lock->unlock(); | |
| 128 if (needs_pll()) { | |
| 129 release_and_notify_pending_list_lock(); | |
| 130 } | |
| 131 } | |
| 132 | |
| 133 ////////////////////////////////////////////////////////// | |
| 134 // Methods in class VM_CMS_Initial_Mark | |
| 135 ////////////////////////////////////////////////////////// | |
| 136 void VM_CMS_Initial_Mark::doit() { | |
| 137 if (lost_race()) { | |
| 138 // Nothing to do. | |
| 139 return; | |
| 140 } | |
| 4006 | 141 #ifndef USDT2 |
| 0 | 142 HS_DTRACE_PROBE(hs_private, cms__initmark__begin); |
| 4006 | 143 #else /* USDT2 */ |
| 144 HS_PRIVATE_CMS_INITMARK_BEGIN( | |
| 145 ); | |
| 146 #endif /* USDT2 */ | |
| 0 | 147 |
| 10405 | 148 _collector->_gc_timer_cm->register_gc_pause_start("Initial Mark", os::elapsed_counter()); |
| 149 | |
| 0 | 150 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
| 151 GCCauseSetter gccs(gch, GCCause::_cms_initial_mark); | |
| 152 | |
| 153 VM_CMS_Operation::verify_before_gc(); | |
| 154 | |
| 155 IsGCActiveMark x; // stop-world GC active | |
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156 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsInitial, gch->gc_cause()); |
| 0 | 157 |
| 158 VM_CMS_Operation::verify_after_gc(); | |
| 10405 | 159 |
| 160 _collector->_gc_timer_cm->register_gc_pause_end(os::elapsed_counter()); | |
| 161 | |
| 4006 | 162 #ifndef USDT2 |
| 0 | 163 HS_DTRACE_PROBE(hs_private, cms__initmark__end); |
| 4006 | 164 #else /* USDT2 */ |
| 165 HS_PRIVATE_CMS_INITMARK_END( | |
| 166 ); | |
| 167 #endif /* USDT2 */ | |
| 0 | 168 } |
| 169 | |
| 170 ////////////////////////////////////////////////////////// | |
| 171 // Methods in class VM_CMS_Final_Remark_Operation | |
| 172 ////////////////////////////////////////////////////////// | |
| 173 void VM_CMS_Final_Remark::doit() { | |
| 174 if (lost_race()) { | |
| 175 // Nothing to do. | |
| 176 return; | |
| 177 } | |
| 4006 | 178 #ifndef USDT2 |
| 0 | 179 HS_DTRACE_PROBE(hs_private, cms__remark__begin); |
| 4006 | 180 #else /* USDT2 */ |
| 181 HS_PRIVATE_CMS_REMARK_BEGIN( | |
| 182 ); | |
| 183 #endif /* USDT2 */ | |
| 0 | 184 |
| 10405 | 185 _collector->_gc_timer_cm->register_gc_pause_start("Final Mark", os::elapsed_counter()); |
| 186 | |
| 0 | 187 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
| 188 GCCauseSetter gccs(gch, GCCause::_cms_final_remark); | |
| 189 | |
| 190 VM_CMS_Operation::verify_before_gc(); | |
| 191 | |
| 192 IsGCActiveMark x; // stop-world GC active | |
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193 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsFinal, gch->gc_cause()); |
| 0 | 194 |
| 195 VM_CMS_Operation::verify_after_gc(); | |
| 10405 | 196 |
| 197 _collector->save_heap_summary(); | |
| 198 _collector->_gc_timer_cm->register_gc_pause_end(os::elapsed_counter()); | |
| 199 | |
| 4006 | 200 #ifndef USDT2 |
| 0 | 201 HS_DTRACE_PROBE(hs_private, cms__remark__end); |
| 4006 | 202 #else /* USDT2 */ |
| 203 HS_PRIVATE_CMS_REMARK_END( | |
| 204 ); | |
| 205 #endif /* USDT2 */ | |
| 0 | 206 } |
| 207 | |
| 208 // VM operation to invoke a concurrent collection of a | |
| 209 // GenCollectedHeap heap. | |
| 210 void VM_GenCollectFullConcurrent::doit() { | |
| 211 assert(Thread::current()->is_VM_thread(), "Should be VM thread"); | |
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212 assert(GCLockerInvokesConcurrent || ExplicitGCInvokesConcurrent, "Unexpected"); |
| 0 | 213 |
| 214 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 215 if (_gc_count_before == gch->total_collections()) { | |
| 216 // The "full" of do_full_collection call below "forces" | |
| 217 // a collection; the second arg, 0, below ensures that | |
| 218 // only the young gen is collected. XXX In the future, | |
| 219 // we'll probably need to have something in this interface | |
| 220 // to say do this only if we are sure we will not bail | |
| 221 // out to a full collection in this attempt, but that's | |
| 222 // for the future. | |
| 223 assert(SafepointSynchronize::is_at_safepoint(), | |
| 224 "We can only be executing this arm of if at a safepoint"); | |
| 225 GCCauseSetter gccs(gch, _gc_cause); | |
| 226 gch->do_full_collection(gch->must_clear_all_soft_refs(), | |
| 227 0 /* collect only youngest gen */); | |
| 228 } // Else no need for a foreground young gc | |
| 229 assert((_gc_count_before < gch->total_collections()) || | |
| 230 (GC_locker::is_active() /* gc may have been skipped */ | |
| 231 && (_gc_count_before == gch->total_collections())), | |
| 232 "total_collections() should be monotonically increasing"); | |
| 233 | |
| 234 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
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235 assert(_full_gc_count_before <= gch->total_full_collections(), "Error"); |
| 0 | 236 if (gch->total_full_collections() == _full_gc_count_before) { |
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237 // Disable iCMS until the full collection is done, and |
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238 // remember that we did so. |
| 0 | 239 CMSCollector::disable_icms(); |
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240 _disabled_icms = true; |
| 0 | 241 // In case CMS thread was in icms_wait(), wake it up. |
| 242 CMSCollector::start_icms(); | |
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243 // Nudge the CMS thread to start a concurrent collection. |
| 10405 | 244 CMSCollector::request_full_gc(_full_gc_count_before, _gc_cause); |
| 0 | 245 } else { |
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246 assert(_full_gc_count_before < gch->total_full_collections(), "Error"); |
| 0 | 247 FullGCCount_lock->notify_all(); // Inform the Java thread its work is done |
| 248 } | |
| 249 } | |
| 250 | |
| 251 bool VM_GenCollectFullConcurrent::evaluate_at_safepoint() const { | |
| 252 Thread* thr = Thread::current(); | |
| 253 assert(thr != NULL, "Unexpected tid"); | |
| 254 if (!thr->is_Java_thread()) { | |
| 255 assert(thr->is_VM_thread(), "Expected to be evaluated by VM thread"); | |
| 256 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 257 if (_gc_count_before != gch->total_collections()) { | |
| 258 // No need to do a young gc, we'll just nudge the CMS thread | |
| 259 // in the doit() method above, to be executed soon. | |
| 260 assert(_gc_count_before < gch->total_collections(), | |
| 261 "total_collections() should be monotnically increasing"); | |
| 262 return false; // no need for foreground young gc | |
| 263 } | |
| 264 } | |
| 265 return true; // may still need foreground young gc | |
| 266 } | |
| 267 | |
| 268 | |
| 269 void VM_GenCollectFullConcurrent::doit_epilogue() { | |
| 270 Thread* thr = Thread::current(); | |
| 271 assert(thr->is_Java_thread(), "just checking"); | |
| 272 JavaThread* jt = (JavaThread*)thr; | |
| 273 // Release the Heap_lock first. | |
| 274 Heap_lock->unlock(); | |
| 275 release_and_notify_pending_list_lock(); | |
| 276 | |
| 277 // It is fine to test whether completed collections has | |
| 278 // exceeded our request count without locking because | |
| 279 // the completion count is monotonically increasing; | |
| 280 // this will break for very long-running apps when the | |
| 281 // count overflows and wraps around. XXX fix me !!! | |
| 282 // e.g. at the rate of 1 full gc per ms, this could | |
| 283 // overflow in about 1000 years. | |
| 284 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
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285 if (_gc_cause != GCCause::_gc_locker && |
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286 gch->total_full_collections_completed() <= _full_gc_count_before) { |
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287 // maybe we should change the condition to test _gc_cause == |
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288 // GCCause::_java_lang_system_gc, instead of |
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289 // _gc_cause != GCCause::_gc_locker |
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290 assert(_gc_cause == GCCause::_java_lang_system_gc, |
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291 "the only way to get here if this was a System.gc()-induced GC"); |
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292 assert(ExplicitGCInvokesConcurrent, "Error"); |
| 0 | 293 // Now, wait for witnessing concurrent gc cycle to complete, |
| 294 // but do so in native mode, because we want to lock the | |
| 295 // FullGCEvent_lock, which may be needed by the VM thread | |
| 296 // or by the CMS thread, so we do not want to be suspended | |
| 297 // while holding that lock. | |
| 298 ThreadToNativeFromVM native(jt); | |
| 299 MutexLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
| 300 // Either a concurrent or a stop-world full gc is sufficient | |
| 301 // witness to our request. | |
| 302 while (gch->total_full_collections_completed() <= _full_gc_count_before) { | |
| 303 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 304 } | |
| 305 } | |
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306 // Enable iCMS back if we disabled it earlier. |
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307 if (_disabled_icms) { |
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308 CMSCollector::enable_icms(); |
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309 } |
| 0 | 310 } |