Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp @ 19083:09292c24d555
LSStackSlotAllocator: hide inner class.
author | Josef Eisl <josef.eisl@jku.at> |
---|---|
date | Sat, 31 Jan 2015 11:07:15 +0100 |
parents | 52b4284cb496 |
children | 7848fc12602b |
rev | line source |
---|---|
0 | 1 /* |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
13400
diff
changeset
|
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 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1520
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1520
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1520
diff
changeset
|
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 |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
13400
diff
changeset
|
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(); | |
6865
4202510ee0fe
8000831: Heap verification output incorrect/incomplete
johnc
parents:
6064
diff
changeset
|
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); | |
6865
4202510ee0fe
8000831: Heap verification output incorrect/incomplete
johnc
parents:
6064
diff
changeset
|
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 |
13400
86e6d691f2e1
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
10405
diff
changeset
|
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 | |
6064
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
4006
diff
changeset
|
157 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsInitial, gch->gc_cause()); |
0 | 158 |
159 VM_CMS_Operation::verify_after_gc(); | |
10405 | 160 |
13400
86e6d691f2e1
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
10405
diff
changeset
|
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 |
13400
86e6d691f2e1
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
10405
diff
changeset
|
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 | |
6064
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
4006
diff
changeset
|
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(); | |
13400
86e6d691f2e1
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
10405
diff
changeset
|
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"); | |
1520
bb843ebc7c55
6919638: CMS: ExplicitGCInvokesConcurrent misinteracts with gc locker
ysr
parents:
0
diff
changeset
|
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); | |
2365
a181f3a124dd
6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents:
1972
diff
changeset
|
236 assert(_full_gc_count_before <= gch->total_full_collections(), "Error"); |
0 | 237 if (gch->total_full_collections() == _full_gc_count_before) { |
2365
a181f3a124dd
6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents:
1972
diff
changeset
|
238 // Disable iCMS until the full collection is done, and |
a181f3a124dd
6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents:
1972
diff
changeset
|
239 // remember that we did so. |
0 | 240 CMSCollector::disable_icms(); |
2365
a181f3a124dd
6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents:
1972
diff
changeset
|
241 _disabled_icms = true; |
0 | 242 // In case CMS thread was in icms_wait(), wake it up. |
243 CMSCollector::start_icms(); | |
1520
bb843ebc7c55
6919638: CMS: ExplicitGCInvokesConcurrent misinteracts with gc locker
ysr
parents:
0
diff
changeset
|
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 { |
2365
a181f3a124dd
6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents:
1972
diff
changeset
|
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(); | |
1520
bb843ebc7c55
6919638: CMS: ExplicitGCInvokesConcurrent misinteracts with gc locker
ysr
parents:
0
diff
changeset
|
286 if (_gc_cause != GCCause::_gc_locker && |
bb843ebc7c55
6919638: CMS: ExplicitGCInvokesConcurrent misinteracts with gc locker
ysr
parents:
0
diff
changeset
|
287 gch->total_full_collections_completed() <= _full_gc_count_before) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1552
diff
changeset
|
288 // maybe we should change the condition to test _gc_cause == |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1552
diff
changeset
|
289 // GCCause::_java_lang_system_gc, instead of |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1552
diff
changeset
|
290 // _gc_cause != GCCause::_gc_locker |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1552
diff
changeset
|
291 assert(_gc_cause == GCCause::_java_lang_system_gc, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1552
diff
changeset
|
292 "the only way to get here if this was a System.gc()-induced GC"); |
1520
bb843ebc7c55
6919638: CMS: ExplicitGCInvokesConcurrent misinteracts with gc locker
ysr
parents:
0
diff
changeset
|
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 } | |
2365
a181f3a124dd
6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents:
1972
diff
changeset
|
307 // Enable iCMS back if we disabled it earlier. |
a181f3a124dd
6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents:
1972
diff
changeset
|
308 if (_disabled_icms) { |
a181f3a124dd
6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents:
1972
diff
changeset
|
309 CMSCollector::enable_icms(); |
a181f3a124dd
6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents:
1972
diff
changeset
|
310 } |
0 | 311 } |