Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp @ 13037:c8fc12209830
8027616: Off by one error in putback for compressed oops nashorn performance improvement
Summary: Should compare bounds greater than or equal 4G when deciding if shift is needed or CDS area + compressed class space are within 4G of each other.
Reviewed-by: stefank, hseigel, zgu
author | coleenp |
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date | Thu, 31 Oct 2013 14:11:02 -0400 |
parents | f2110083203d |
children | 86e6d691f2e1 |
rev | line source |
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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 } |