Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp @ 1903:87d6a4d1ecbc
6990192: VM crashes in ciTypeFlow::get_block_for()
Reviewed-by: never
author | twisti |
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date | Tue, 19 Oct 2010 02:52:57 -0700 |
parents | 4e5661ba9d98 |
children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2006, 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 # include "incls/_precompiled.incl" | |
25 # include "incls/_vmCMSOperations.cpp.incl" | |
26 | |
27 HS_DTRACE_PROBE_DECL(hs_private, cms__initmark__begin); | |
28 HS_DTRACE_PROBE_DECL(hs_private, cms__initmark__end); | |
29 | |
30 HS_DTRACE_PROBE_DECL(hs_private, cms__remark__begin); | |
31 HS_DTRACE_PROBE_DECL(hs_private, cms__remark__end); | |
32 | |
33 ////////////////////////////////////////////////////////// | |
34 // Methods in abstract class VM_CMS_Operation | |
35 ////////////////////////////////////////////////////////// | |
36 void VM_CMS_Operation::acquire_pending_list_lock() { | |
37 // The caller may block while communicating | |
38 // with the SLT thread in order to acquire/release the PLL. | |
39 ConcurrentMarkSweepThread::slt()-> | |
40 manipulatePLL(SurrogateLockerThread::acquirePLL); | |
41 } | |
42 | |
43 void VM_CMS_Operation::release_and_notify_pending_list_lock() { | |
44 // The caller may block while communicating | |
45 // with the SLT thread in order to acquire/release the PLL. | |
46 ConcurrentMarkSweepThread::slt()-> | |
47 manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL); | |
48 } | |
49 | |
50 void VM_CMS_Operation::verify_before_gc() { | |
51 if (VerifyBeforeGC && | |
52 GenCollectedHeap::heap()->total_collections() >= VerifyGCStartAt) { | |
53 HandleMark hm; | |
54 FreelistLocker x(_collector); | |
55 MutexLockerEx y(_collector->bitMapLock(), Mutex::_no_safepoint_check_flag); | |
56 Universe::heap()->prepare_for_verify(); | |
57 Universe::verify(true); | |
58 } | |
59 } | |
60 | |
61 void VM_CMS_Operation::verify_after_gc() { | |
62 if (VerifyAfterGC && | |
63 GenCollectedHeap::heap()->total_collections() >= VerifyGCStartAt) { | |
64 HandleMark hm; | |
65 FreelistLocker x(_collector); | |
66 MutexLockerEx y(_collector->bitMapLock(), Mutex::_no_safepoint_check_flag); | |
67 Universe::verify(true); | |
68 } | |
69 } | |
70 | |
71 bool VM_CMS_Operation::lost_race() const { | |
72 if (CMSCollector::abstract_state() == CMSCollector::Idling) { | |
73 // We lost a race to a foreground collection | |
74 // -- there's nothing to do | |
75 return true; | |
76 } | |
77 assert(CMSCollector::abstract_state() == legal_state(), | |
78 "Inconsistent collector state?"); | |
79 return false; | |
80 } | |
81 | |
82 bool VM_CMS_Operation::doit_prologue() { | |
83 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking"); | |
84 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock"); | |
85 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(), | |
86 "Possible deadlock"); | |
87 | |
88 if (needs_pll()) { | |
89 acquire_pending_list_lock(); | |
90 } | |
91 // Get the Heap_lock after the pending_list_lock. | |
92 Heap_lock->lock(); | |
93 if (lost_race()) { | |
94 assert(_prologue_succeeded == false, "Initialized in c'tor"); | |
95 Heap_lock->unlock(); | |
96 if (needs_pll()) { | |
97 release_and_notify_pending_list_lock(); | |
98 } | |
99 } else { | |
100 _prologue_succeeded = true; | |
101 } | |
102 return _prologue_succeeded; | |
103 } | |
104 | |
105 void VM_CMS_Operation::doit_epilogue() { | |
106 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking"); | |
107 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock"); | |
108 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(), | |
109 "Possible deadlock"); | |
110 | |
111 // Release the Heap_lock first. | |
112 Heap_lock->unlock(); | |
113 if (needs_pll()) { | |
114 release_and_notify_pending_list_lock(); | |
115 } | |
116 } | |
117 | |
118 ////////////////////////////////////////////////////////// | |
119 // Methods in class VM_CMS_Initial_Mark | |
120 ////////////////////////////////////////////////////////// | |
121 void VM_CMS_Initial_Mark::doit() { | |
122 if (lost_race()) { | |
123 // Nothing to do. | |
124 return; | |
125 } | |
126 HS_DTRACE_PROBE(hs_private, cms__initmark__begin); | |
127 | |
128 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
129 GCCauseSetter gccs(gch, GCCause::_cms_initial_mark); | |
130 | |
131 VM_CMS_Operation::verify_before_gc(); | |
132 | |
133 IsGCActiveMark x; // stop-world GC active | |
134 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsInitial); | |
135 | |
136 VM_CMS_Operation::verify_after_gc(); | |
137 HS_DTRACE_PROBE(hs_private, cms__initmark__end); | |
138 } | |
139 | |
140 ////////////////////////////////////////////////////////// | |
141 // Methods in class VM_CMS_Final_Remark_Operation | |
142 ////////////////////////////////////////////////////////// | |
143 void VM_CMS_Final_Remark::doit() { | |
144 if (lost_race()) { | |
145 // Nothing to do. | |
146 return; | |
147 } | |
148 HS_DTRACE_PROBE(hs_private, cms__remark__begin); | |
149 | |
150 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
151 GCCauseSetter gccs(gch, GCCause::_cms_final_remark); | |
152 | |
153 VM_CMS_Operation::verify_before_gc(); | |
154 | |
155 IsGCActiveMark x; // stop-world GC active | |
156 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsFinal); | |
157 | |
158 VM_CMS_Operation::verify_after_gc(); | |
159 HS_DTRACE_PROBE(hs_private, cms__remark__end); | |
160 } | |
161 | |
162 // VM operation to invoke a concurrent collection of a | |
163 // GenCollectedHeap heap. | |
164 void VM_GenCollectFullConcurrent::doit() { | |
165 assert(Thread::current()->is_VM_thread(), "Should be VM thread"); | |
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166 assert(GCLockerInvokesConcurrent || ExplicitGCInvokesConcurrent, "Unexpected"); |
0 | 167 |
168 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
169 if (_gc_count_before == gch->total_collections()) { | |
170 // The "full" of do_full_collection call below "forces" | |
171 // a collection; the second arg, 0, below ensures that | |
172 // only the young gen is collected. XXX In the future, | |
173 // we'll probably need to have something in this interface | |
174 // to say do this only if we are sure we will not bail | |
175 // out to a full collection in this attempt, but that's | |
176 // for the future. | |
177 assert(SafepointSynchronize::is_at_safepoint(), | |
178 "We can only be executing this arm of if at a safepoint"); | |
179 GCCauseSetter gccs(gch, _gc_cause); | |
180 gch->do_full_collection(gch->must_clear_all_soft_refs(), | |
181 0 /* collect only youngest gen */); | |
182 } // Else no need for a foreground young gc | |
183 assert((_gc_count_before < gch->total_collections()) || | |
184 (GC_locker::is_active() /* gc may have been skipped */ | |
185 && (_gc_count_before == gch->total_collections())), | |
186 "total_collections() should be monotonically increasing"); | |
187 | |
188 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
189 if (gch->total_full_collections() == _full_gc_count_before) { | |
190 // Disable iCMS until the full collection is done. | |
191 CMSCollector::disable_icms(); | |
192 // In case CMS thread was in icms_wait(), wake it up. | |
193 CMSCollector::start_icms(); | |
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194 // Nudge the CMS thread to start a concurrent collection. |
0 | 195 CMSCollector::request_full_gc(_full_gc_count_before); |
196 } else { | |
197 FullGCCount_lock->notify_all(); // Inform the Java thread its work is done | |
198 } | |
199 } | |
200 | |
201 bool VM_GenCollectFullConcurrent::evaluate_at_safepoint() const { | |
202 Thread* thr = Thread::current(); | |
203 assert(thr != NULL, "Unexpected tid"); | |
204 if (!thr->is_Java_thread()) { | |
205 assert(thr->is_VM_thread(), "Expected to be evaluated by VM thread"); | |
206 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
207 if (_gc_count_before != gch->total_collections()) { | |
208 // No need to do a young gc, we'll just nudge the CMS thread | |
209 // in the doit() method above, to be executed soon. | |
210 assert(_gc_count_before < gch->total_collections(), | |
211 "total_collections() should be monotnically increasing"); | |
212 return false; // no need for foreground young gc | |
213 } | |
214 } | |
215 return true; // may still need foreground young gc | |
216 } | |
217 | |
218 | |
219 void VM_GenCollectFullConcurrent::doit_epilogue() { | |
220 Thread* thr = Thread::current(); | |
221 assert(thr->is_Java_thread(), "just checking"); | |
222 JavaThread* jt = (JavaThread*)thr; | |
223 // Release the Heap_lock first. | |
224 Heap_lock->unlock(); | |
225 release_and_notify_pending_list_lock(); | |
226 | |
227 // It is fine to test whether completed collections has | |
228 // exceeded our request count without locking because | |
229 // the completion count is monotonically increasing; | |
230 // this will break for very long-running apps when the | |
231 // count overflows and wraps around. XXX fix me !!! | |
232 // e.g. at the rate of 1 full gc per ms, this could | |
233 // overflow in about 1000 years. | |
234 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
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235 if (_gc_cause != GCCause::_gc_locker && |
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236 gch->total_full_collections_completed() <= _full_gc_count_before) { |
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237 // maybe we should change the condition to test _gc_cause == |
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238 // GCCause::_java_lang_system_gc, instead of |
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239 // _gc_cause != GCCause::_gc_locker |
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240 assert(_gc_cause == GCCause::_java_lang_system_gc, |
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241 "the only way to get here if this was a System.gc()-induced GC"); |
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242 assert(ExplicitGCInvokesConcurrent, "Error"); |
0 | 243 // Now, wait for witnessing concurrent gc cycle to complete, |
244 // but do so in native mode, because we want to lock the | |
245 // FullGCEvent_lock, which may be needed by the VM thread | |
246 // or by the CMS thread, so we do not want to be suspended | |
247 // while holding that lock. | |
248 ThreadToNativeFromVM native(jt); | |
249 MutexLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
250 // Either a concurrent or a stop-world full gc is sufficient | |
251 // witness to our request. | |
252 while (gch->total_full_collections_completed() <= _full_gc_count_before) { | |
253 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag); | |
254 } | |
255 } | |
256 // Enable iCMS back. | |
257 CMSCollector::enable_icms(); | |
258 } |