Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp @ 14380:e6195383bcaf
8034080: Remove the USDT1 dtrace code from Hotspot
Reviewed-by: dholmes, coleenp
| author | sla |
|---|---|
| date | Tue, 18 Feb 2014 09:15:40 +0100 |
| parents | e5d78f318aec |
| children | 4ca6dc0799b6 |
| 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 | |
| 0 | 38 ////////////////////////////////////////////////////////// |
| 39 // Methods in abstract class VM_CMS_Operation | |
| 40 ////////////////////////////////////////////////////////// | |
| 41 void VM_CMS_Operation::acquire_pending_list_lock() { | |
| 42 // The caller may block while communicating | |
| 43 // with the SLT thread in order to acquire/release the PLL. | |
| 44 ConcurrentMarkSweepThread::slt()-> | |
| 45 manipulatePLL(SurrogateLockerThread::acquirePLL); | |
| 46 } | |
| 47 | |
| 48 void VM_CMS_Operation::release_and_notify_pending_list_lock() { | |
| 49 // The caller may block while communicating | |
| 50 // with the SLT thread in order to acquire/release the PLL. | |
| 51 ConcurrentMarkSweepThread::slt()-> | |
| 52 manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL); | |
| 53 } | |
| 54 | |
| 55 void VM_CMS_Operation::verify_before_gc() { | |
| 56 if (VerifyBeforeGC && | |
| 57 GenCollectedHeap::heap()->total_collections() >= VerifyGCStartAt) { | |
| 10405 | 58 GCTraceTime tm("Verify Before", false, false, _collector->_gc_timer_cm); |
| 0 | 59 HandleMark hm; |
| 60 FreelistLocker x(_collector); | |
| 61 MutexLockerEx y(_collector->bitMapLock(), Mutex::_no_safepoint_check_flag); | |
| 62 Universe::heap()->prepare_for_verify(); | |
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63 Universe::verify(); |
| 0 | 64 } |
| 65 } | |
| 66 | |
| 67 void VM_CMS_Operation::verify_after_gc() { | |
| 68 if (VerifyAfterGC && | |
| 69 GenCollectedHeap::heap()->total_collections() >= VerifyGCStartAt) { | |
| 10405 | 70 GCTraceTime tm("Verify After", false, false, _collector->_gc_timer_cm); |
| 0 | 71 HandleMark hm; |
| 72 FreelistLocker x(_collector); | |
| 73 MutexLockerEx y(_collector->bitMapLock(), Mutex::_no_safepoint_check_flag); | |
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74 Universe::verify(); |
| 0 | 75 } |
| 76 } | |
| 77 | |
| 78 bool VM_CMS_Operation::lost_race() const { | |
| 79 if (CMSCollector::abstract_state() == CMSCollector::Idling) { | |
| 80 // We lost a race to a foreground collection | |
| 81 // -- there's nothing to do | |
| 82 return true; | |
| 83 } | |
| 84 assert(CMSCollector::abstract_state() == legal_state(), | |
| 85 "Inconsistent collector state?"); | |
| 86 return false; | |
| 87 } | |
| 88 | |
| 89 bool VM_CMS_Operation::doit_prologue() { | |
| 90 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking"); | |
| 91 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock"); | |
| 92 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(), | |
| 93 "Possible deadlock"); | |
| 94 | |
| 95 if (needs_pll()) { | |
| 96 acquire_pending_list_lock(); | |
| 97 } | |
| 98 // Get the Heap_lock after the pending_list_lock. | |
| 99 Heap_lock->lock(); | |
| 100 if (lost_race()) { | |
| 101 assert(_prologue_succeeded == false, "Initialized in c'tor"); | |
| 102 Heap_lock->unlock(); | |
| 103 if (needs_pll()) { | |
| 104 release_and_notify_pending_list_lock(); | |
| 105 } | |
| 106 } else { | |
| 107 _prologue_succeeded = true; | |
| 108 } | |
| 109 return _prologue_succeeded; | |
| 110 } | |
| 111 | |
| 112 void VM_CMS_Operation::doit_epilogue() { | |
| 113 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking"); | |
| 114 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock"); | |
| 115 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(), | |
| 116 "Possible deadlock"); | |
| 117 | |
| 118 // Release the Heap_lock first. | |
| 119 Heap_lock->unlock(); | |
| 120 if (needs_pll()) { | |
| 121 release_and_notify_pending_list_lock(); | |
| 122 } | |
| 123 } | |
| 124 | |
| 125 ////////////////////////////////////////////////////////// | |
| 126 // Methods in class VM_CMS_Initial_Mark | |
| 127 ////////////////////////////////////////////////////////// | |
| 128 void VM_CMS_Initial_Mark::doit() { | |
| 129 if (lost_race()) { | |
| 130 // Nothing to do. | |
| 131 return; | |
| 132 } | |
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133 HS_PRIVATE_CMS_INITMARK_BEGIN(); |
| 0 | 134 |
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135 _collector->_gc_timer_cm->register_gc_pause_start("Initial Mark"); |
| 10405 | 136 |
| 0 | 137 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
| 138 GCCauseSetter gccs(gch, GCCause::_cms_initial_mark); | |
| 139 | |
| 140 VM_CMS_Operation::verify_before_gc(); | |
| 141 | |
| 142 IsGCActiveMark x; // stop-world GC active | |
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143 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsInitial, gch->gc_cause()); |
| 0 | 144 |
| 145 VM_CMS_Operation::verify_after_gc(); | |
| 10405 | 146 |
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147 _collector->_gc_timer_cm->register_gc_pause_end(); |
| 10405 | 148 |
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149 HS_PRIVATE_CMS_INITMARK_END(); |
| 0 | 150 } |
| 151 | |
| 152 ////////////////////////////////////////////////////////// | |
| 153 // Methods in class VM_CMS_Final_Remark_Operation | |
| 154 ////////////////////////////////////////////////////////// | |
| 155 void VM_CMS_Final_Remark::doit() { | |
| 156 if (lost_race()) { | |
| 157 // Nothing to do. | |
| 158 return; | |
| 159 } | |
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160 HS_PRIVATE_CMS_REMARK_BEGIN(); |
| 0 | 161 |
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162 _collector->_gc_timer_cm->register_gc_pause_start("Final Mark"); |
| 10405 | 163 |
| 0 | 164 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
| 165 GCCauseSetter gccs(gch, GCCause::_cms_final_remark); | |
| 166 | |
| 167 VM_CMS_Operation::verify_before_gc(); | |
| 168 | |
| 169 IsGCActiveMark x; // stop-world GC active | |
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170 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsFinal, gch->gc_cause()); |
| 0 | 171 |
| 172 VM_CMS_Operation::verify_after_gc(); | |
| 10405 | 173 |
| 174 _collector->save_heap_summary(); | |
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175 _collector->_gc_timer_cm->register_gc_pause_end(); |
| 10405 | 176 |
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177 HS_PRIVATE_CMS_REMARK_END(); |
| 0 | 178 } |
| 179 | |
| 180 // VM operation to invoke a concurrent collection of a | |
| 181 // GenCollectedHeap heap. | |
| 182 void VM_GenCollectFullConcurrent::doit() { | |
| 183 assert(Thread::current()->is_VM_thread(), "Should be VM thread"); | |
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184 assert(GCLockerInvokesConcurrent || ExplicitGCInvokesConcurrent, "Unexpected"); |
| 0 | 185 |
| 186 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 187 if (_gc_count_before == gch->total_collections()) { | |
| 188 // The "full" of do_full_collection call below "forces" | |
| 189 // a collection; the second arg, 0, below ensures that | |
| 190 // only the young gen is collected. XXX In the future, | |
| 191 // we'll probably need to have something in this interface | |
| 192 // to say do this only if we are sure we will not bail | |
| 193 // out to a full collection in this attempt, but that's | |
| 194 // for the future. | |
| 195 assert(SafepointSynchronize::is_at_safepoint(), | |
| 196 "We can only be executing this arm of if at a safepoint"); | |
| 197 GCCauseSetter gccs(gch, _gc_cause); | |
| 198 gch->do_full_collection(gch->must_clear_all_soft_refs(), | |
| 199 0 /* collect only youngest gen */); | |
| 200 } // Else no need for a foreground young gc | |
| 201 assert((_gc_count_before < gch->total_collections()) || | |
| 202 (GC_locker::is_active() /* gc may have been skipped */ | |
| 203 && (_gc_count_before == gch->total_collections())), | |
| 204 "total_collections() should be monotonically increasing"); | |
| 205 | |
| 206 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
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207 assert(_full_gc_count_before <= gch->total_full_collections(), "Error"); |
| 0 | 208 if (gch->total_full_collections() == _full_gc_count_before) { |
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209 // Disable iCMS until the full collection is done, and |
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210 // remember that we did so. |
| 0 | 211 CMSCollector::disable_icms(); |
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212 _disabled_icms = true; |
| 0 | 213 // In case CMS thread was in icms_wait(), wake it up. |
| 214 CMSCollector::start_icms(); | |
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215 // Nudge the CMS thread to start a concurrent collection. |
| 10405 | 216 CMSCollector::request_full_gc(_full_gc_count_before, _gc_cause); |
| 0 | 217 } else { |
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218 assert(_full_gc_count_before < gch->total_full_collections(), "Error"); |
| 0 | 219 FullGCCount_lock->notify_all(); // Inform the Java thread its work is done |
| 220 } | |
| 221 } | |
| 222 | |
| 223 bool VM_GenCollectFullConcurrent::evaluate_at_safepoint() const { | |
| 224 Thread* thr = Thread::current(); | |
| 225 assert(thr != NULL, "Unexpected tid"); | |
| 226 if (!thr->is_Java_thread()) { | |
| 227 assert(thr->is_VM_thread(), "Expected to be evaluated by VM thread"); | |
| 228 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 229 if (_gc_count_before != gch->total_collections()) { | |
| 230 // No need to do a young gc, we'll just nudge the CMS thread | |
| 231 // in the doit() method above, to be executed soon. | |
| 232 assert(_gc_count_before < gch->total_collections(), | |
| 14358 | 233 "total_collections() should be monotonically increasing"); |
| 0 | 234 return false; // no need for foreground young gc |
| 235 } | |
| 236 } | |
| 237 return true; // may still need foreground young gc | |
| 238 } | |
| 239 | |
| 240 | |
| 241 void VM_GenCollectFullConcurrent::doit_epilogue() { | |
| 242 Thread* thr = Thread::current(); | |
| 243 assert(thr->is_Java_thread(), "just checking"); | |
| 244 JavaThread* jt = (JavaThread*)thr; | |
| 245 // Release the Heap_lock first. | |
| 246 Heap_lock->unlock(); | |
| 247 release_and_notify_pending_list_lock(); | |
| 248 | |
| 249 // It is fine to test whether completed collections has | |
| 250 // exceeded our request count without locking because | |
| 251 // the completion count is monotonically increasing; | |
| 252 // this will break for very long-running apps when the | |
| 253 // count overflows and wraps around. XXX fix me !!! | |
| 254 // e.g. at the rate of 1 full gc per ms, this could | |
| 255 // overflow in about 1000 years. | |
| 256 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
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257 if (_gc_cause != GCCause::_gc_locker && |
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258 gch->total_full_collections_completed() <= _full_gc_count_before) { |
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259 // maybe we should change the condition to test _gc_cause == |
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260 // GCCause::_java_lang_system_gc, instead of |
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261 // _gc_cause != GCCause::_gc_locker |
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262 assert(_gc_cause == GCCause::_java_lang_system_gc, |
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263 "the only way to get here if this was a System.gc()-induced GC"); |
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264 assert(ExplicitGCInvokesConcurrent, "Error"); |
| 0 | 265 // Now, wait for witnessing concurrent gc cycle to complete, |
| 266 // but do so in native mode, because we want to lock the | |
| 267 // FullGCEvent_lock, which may be needed by the VM thread | |
| 268 // or by the CMS thread, so we do not want to be suspended | |
| 269 // while holding that lock. | |
| 270 ThreadToNativeFromVM native(jt); | |
| 271 MutexLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
| 272 // Either a concurrent or a stop-world full gc is sufficient | |
| 273 // witness to our request. | |
| 274 while (gch->total_full_collections_completed() <= _full_gc_count_before) { | |
| 275 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 276 } | |
| 277 } | |
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278 // Enable iCMS back if we disabled it earlier. |
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279 if (_disabled_icms) { |
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280 CMSCollector::enable_icms(); |
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281 } |
| 0 | 282 } |