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annotate src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp @ 4625:73f935f28920
in esa mode, check that values in stateAfter are all ready after LIRGen of a ValudeNode
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Fri, 17 Feb 2012 11:37:44 +0100 |
parents | 436b4a3231bf |
children | 9d679effd28c |
rev | line source |
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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 | |
149 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsInitial); | |
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 | |
181 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsFinal); | |
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 } |