Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp @ 6064:9d679effd28c
7166894: Add gc cause to GC logging for all collectors
Reviewed-by: mgerdin, johnc
| author | brutisso |
|---|---|
| date | Tue, 15 May 2012 10:25:06 +0200 |
| parents | 436b4a3231bf |
| children | b9a9ed0f8eeb 4202510ee0fe |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2005, 2011, 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" | |
| 29 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
| 30 #include "memory/gcLocker.inline.hpp" | |
| 31 #include "runtime/interfaceSupport.hpp" | |
| 32 #include "utilities/dtrace.hpp" | |
| 4006 | 33 |
| 34 | |
| 35 #ifndef USDT2 | |
| 0 | 36 HS_DTRACE_PROBE_DECL(hs_private, cms__initmark__begin); |
| 37 HS_DTRACE_PROBE_DECL(hs_private, cms__initmark__end); | |
| 38 | |
| 39 HS_DTRACE_PROBE_DECL(hs_private, cms__remark__begin); | |
| 40 HS_DTRACE_PROBE_DECL(hs_private, cms__remark__end); | |
| 4006 | 41 #endif /* !USDT2 */ |
| 0 | 42 |
| 43 ////////////////////////////////////////////////////////// | |
| 44 // Methods in abstract class VM_CMS_Operation | |
| 45 ////////////////////////////////////////////////////////// | |
| 46 void VM_CMS_Operation::acquire_pending_list_lock() { | |
| 47 // The caller may block while communicating | |
| 48 // with the SLT thread in order to acquire/release the PLL. | |
| 49 ConcurrentMarkSweepThread::slt()-> | |
| 50 manipulatePLL(SurrogateLockerThread::acquirePLL); | |
| 51 } | |
| 52 | |
| 53 void VM_CMS_Operation::release_and_notify_pending_list_lock() { | |
| 54 // The caller may block while communicating | |
| 55 // with the SLT thread in order to acquire/release the PLL. | |
| 56 ConcurrentMarkSweepThread::slt()-> | |
| 57 manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL); | |
| 58 } | |
| 59 | |
| 60 void VM_CMS_Operation::verify_before_gc() { | |
| 61 if (VerifyBeforeGC && | |
| 62 GenCollectedHeap::heap()->total_collections() >= VerifyGCStartAt) { | |
| 63 HandleMark hm; | |
| 64 FreelistLocker x(_collector); | |
| 65 MutexLockerEx y(_collector->bitMapLock(), Mutex::_no_safepoint_check_flag); | |
| 66 Universe::heap()->prepare_for_verify(); | |
| 67 Universe::verify(true); | |
| 68 } | |
| 69 } | |
| 70 | |
| 71 void VM_CMS_Operation::verify_after_gc() { | |
| 72 if (VerifyAfterGC && | |
| 73 GenCollectedHeap::heap()->total_collections() >= VerifyGCStartAt) { | |
| 74 HandleMark hm; | |
| 75 FreelistLocker x(_collector); | |
| 76 MutexLockerEx y(_collector->bitMapLock(), Mutex::_no_safepoint_check_flag); | |
| 77 Universe::verify(true); | |
| 78 } | |
| 79 } | |
| 80 | |
| 81 bool VM_CMS_Operation::lost_race() const { | |
| 82 if (CMSCollector::abstract_state() == CMSCollector::Idling) { | |
| 83 // We lost a race to a foreground collection | |
| 84 // -- there's nothing to do | |
| 85 return true; | |
| 86 } | |
| 87 assert(CMSCollector::abstract_state() == legal_state(), | |
| 88 "Inconsistent collector state?"); | |
| 89 return false; | |
| 90 } | |
| 91 | |
| 92 bool VM_CMS_Operation::doit_prologue() { | |
| 93 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking"); | |
| 94 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock"); | |
| 95 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(), | |
| 96 "Possible deadlock"); | |
| 97 | |
| 98 if (needs_pll()) { | |
| 99 acquire_pending_list_lock(); | |
| 100 } | |
| 101 // Get the Heap_lock after the pending_list_lock. | |
| 102 Heap_lock->lock(); | |
| 103 if (lost_race()) { | |
| 104 assert(_prologue_succeeded == false, "Initialized in c'tor"); | |
| 105 Heap_lock->unlock(); | |
| 106 if (needs_pll()) { | |
| 107 release_and_notify_pending_list_lock(); | |
| 108 } | |
| 109 } else { | |
| 110 _prologue_succeeded = true; | |
| 111 } | |
| 112 return _prologue_succeeded; | |
| 113 } | |
| 114 | |
| 115 void VM_CMS_Operation::doit_epilogue() { | |
| 116 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking"); | |
| 117 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock"); | |
| 118 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(), | |
| 119 "Possible deadlock"); | |
| 120 | |
| 121 // Release the Heap_lock first. | |
| 122 Heap_lock->unlock(); | |
| 123 if (needs_pll()) { | |
| 124 release_and_notify_pending_list_lock(); | |
| 125 } | |
| 126 } | |
| 127 | |
| 128 ////////////////////////////////////////////////////////// | |
| 129 // Methods in class VM_CMS_Initial_Mark | |
| 130 ////////////////////////////////////////////////////////// | |
| 131 void VM_CMS_Initial_Mark::doit() { | |
| 132 if (lost_race()) { | |
| 133 // Nothing to do. | |
| 134 return; | |
| 135 } | |
| 4006 | 136 #ifndef USDT2 |
| 0 | 137 HS_DTRACE_PROBE(hs_private, cms__initmark__begin); |
| 4006 | 138 #else /* USDT2 */ |
| 139 HS_PRIVATE_CMS_INITMARK_BEGIN( | |
| 140 ); | |
| 141 #endif /* USDT2 */ | |
| 0 | 142 |
| 143 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 144 GCCauseSetter gccs(gch, GCCause::_cms_initial_mark); | |
| 145 | |
| 146 VM_CMS_Operation::verify_before_gc(); | |
| 147 | |
| 148 IsGCActiveMark x; // stop-world GC active | |
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149 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsInitial, gch->gc_cause()); |
| 0 | 150 |
| 151 VM_CMS_Operation::verify_after_gc(); | |
| 4006 | 152 #ifndef USDT2 |
| 0 | 153 HS_DTRACE_PROBE(hs_private, cms__initmark__end); |
| 4006 | 154 #else /* USDT2 */ |
| 155 HS_PRIVATE_CMS_INITMARK_END( | |
| 156 ); | |
| 157 #endif /* USDT2 */ | |
| 0 | 158 } |
| 159 | |
| 160 ////////////////////////////////////////////////////////// | |
| 161 // Methods in class VM_CMS_Final_Remark_Operation | |
| 162 ////////////////////////////////////////////////////////// | |
| 163 void VM_CMS_Final_Remark::doit() { | |
| 164 if (lost_race()) { | |
| 165 // Nothing to do. | |
| 166 return; | |
| 167 } | |
| 4006 | 168 #ifndef USDT2 |
| 0 | 169 HS_DTRACE_PROBE(hs_private, cms__remark__begin); |
| 4006 | 170 #else /* USDT2 */ |
| 171 HS_PRIVATE_CMS_REMARK_BEGIN( | |
| 172 ); | |
| 173 #endif /* USDT2 */ | |
| 0 | 174 |
| 175 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 176 GCCauseSetter gccs(gch, GCCause::_cms_final_remark); | |
| 177 | |
| 178 VM_CMS_Operation::verify_before_gc(); | |
| 179 | |
| 180 IsGCActiveMark x; // stop-world GC active | |
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181 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsFinal, gch->gc_cause()); |
| 0 | 182 |
| 183 VM_CMS_Operation::verify_after_gc(); | |
| 4006 | 184 #ifndef USDT2 |
| 0 | 185 HS_DTRACE_PROBE(hs_private, cms__remark__end); |
| 4006 | 186 #else /* USDT2 */ |
| 187 HS_PRIVATE_CMS_REMARK_END( | |
| 188 ); | |
| 189 #endif /* USDT2 */ | |
| 0 | 190 } |
| 191 | |
| 192 // VM operation to invoke a concurrent collection of a | |
| 193 // GenCollectedHeap heap. | |
| 194 void VM_GenCollectFullConcurrent::doit() { | |
| 195 assert(Thread::current()->is_VM_thread(), "Should be VM thread"); | |
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196 assert(GCLockerInvokesConcurrent || ExplicitGCInvokesConcurrent, "Unexpected"); |
| 0 | 197 |
| 198 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 199 if (_gc_count_before == gch->total_collections()) { | |
| 200 // The "full" of do_full_collection call below "forces" | |
| 201 // a collection; the second arg, 0, below ensures that | |
| 202 // only the young gen is collected. XXX In the future, | |
| 203 // we'll probably need to have something in this interface | |
| 204 // to say do this only if we are sure we will not bail | |
| 205 // out to a full collection in this attempt, but that's | |
| 206 // for the future. | |
| 207 assert(SafepointSynchronize::is_at_safepoint(), | |
| 208 "We can only be executing this arm of if at a safepoint"); | |
| 209 GCCauseSetter gccs(gch, _gc_cause); | |
| 210 gch->do_full_collection(gch->must_clear_all_soft_refs(), | |
| 211 0 /* collect only youngest gen */); | |
| 212 } // Else no need for a foreground young gc | |
| 213 assert((_gc_count_before < gch->total_collections()) || | |
| 214 (GC_locker::is_active() /* gc may have been skipped */ | |
| 215 && (_gc_count_before == gch->total_collections())), | |
| 216 "total_collections() should be monotonically increasing"); | |
| 217 | |
| 218 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
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219 assert(_full_gc_count_before <= gch->total_full_collections(), "Error"); |
| 0 | 220 if (gch->total_full_collections() == _full_gc_count_before) { |
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221 // Disable iCMS until the full collection is done, and |
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222 // remember that we did so. |
| 0 | 223 CMSCollector::disable_icms(); |
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224 _disabled_icms = true; |
| 0 | 225 // In case CMS thread was in icms_wait(), wake it up. |
| 226 CMSCollector::start_icms(); | |
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227 // Nudge the CMS thread to start a concurrent collection. |
| 0 | 228 CMSCollector::request_full_gc(_full_gc_count_before); |
| 229 } else { | |
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230 assert(_full_gc_count_before < gch->total_full_collections(), "Error"); |
| 0 | 231 FullGCCount_lock->notify_all(); // Inform the Java thread its work is done |
| 232 } | |
| 233 } | |
| 234 | |
| 235 bool VM_GenCollectFullConcurrent::evaluate_at_safepoint() const { | |
| 236 Thread* thr = Thread::current(); | |
| 237 assert(thr != NULL, "Unexpected tid"); | |
| 238 if (!thr->is_Java_thread()) { | |
| 239 assert(thr->is_VM_thread(), "Expected to be evaluated by VM thread"); | |
| 240 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 241 if (_gc_count_before != gch->total_collections()) { | |
| 242 // No need to do a young gc, we'll just nudge the CMS thread | |
| 243 // in the doit() method above, to be executed soon. | |
| 244 assert(_gc_count_before < gch->total_collections(), | |
| 245 "total_collections() should be monotnically increasing"); | |
| 246 return false; // no need for foreground young gc | |
| 247 } | |
| 248 } | |
| 249 return true; // may still need foreground young gc | |
| 250 } | |
| 251 | |
| 252 | |
| 253 void VM_GenCollectFullConcurrent::doit_epilogue() { | |
| 254 Thread* thr = Thread::current(); | |
| 255 assert(thr->is_Java_thread(), "just checking"); | |
| 256 JavaThread* jt = (JavaThread*)thr; | |
| 257 // Release the Heap_lock first. | |
| 258 Heap_lock->unlock(); | |
| 259 release_and_notify_pending_list_lock(); | |
| 260 | |
| 261 // It is fine to test whether completed collections has | |
| 262 // exceeded our request count without locking because | |
| 263 // the completion count is monotonically increasing; | |
| 264 // this will break for very long-running apps when the | |
| 265 // count overflows and wraps around. XXX fix me !!! | |
| 266 // e.g. at the rate of 1 full gc per ms, this could | |
| 267 // overflow in about 1000 years. | |
| 268 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
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269 if (_gc_cause != GCCause::_gc_locker && |
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270 gch->total_full_collections_completed() <= _full_gc_count_before) { |
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271 // maybe we should change the condition to test _gc_cause == |
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272 // GCCause::_java_lang_system_gc, instead of |
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273 // _gc_cause != GCCause::_gc_locker |
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274 assert(_gc_cause == GCCause::_java_lang_system_gc, |
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275 "the only way to get here if this was a System.gc()-induced GC"); |
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276 assert(ExplicitGCInvokesConcurrent, "Error"); |
| 0 | 277 // Now, wait for witnessing concurrent gc cycle to complete, |
| 278 // but do so in native mode, because we want to lock the | |
| 279 // FullGCEvent_lock, which may be needed by the VM thread | |
| 280 // or by the CMS thread, so we do not want to be suspended | |
| 281 // while holding that lock. | |
| 282 ThreadToNativeFromVM native(jt); | |
| 283 MutexLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
| 284 // Either a concurrent or a stop-world full gc is sufficient | |
| 285 // witness to our request. | |
| 286 while (gch->total_full_collections_completed() <= _full_gc_count_before) { | |
| 287 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 288 } | |
| 289 } | |
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290 // Enable iCMS back if we disabled it earlier. |
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291 if (_disabled_icms) { |
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292 CMSCollector::enable_icms(); |
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293 } |
| 0 | 294 } |