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annotate src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp @ 3710:4e037604f6ee
use alignment for constants specified in DataPatch.alignment
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Mon, 05 Dec 2011 18:15:25 -0800 |
parents | a181f3a124dd |
children | 436b4a3231bf |
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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" | |
0 | 33 HS_DTRACE_PROBE_DECL(hs_private, cms__initmark__begin); |
34 HS_DTRACE_PROBE_DECL(hs_private, cms__initmark__end); | |
35 | |
36 HS_DTRACE_PROBE_DECL(hs_private, cms__remark__begin); | |
37 HS_DTRACE_PROBE_DECL(hs_private, cms__remark__end); | |
38 | |
39 ////////////////////////////////////////////////////////// | |
40 // Methods in abstract class VM_CMS_Operation | |
41 ////////////////////////////////////////////////////////// | |
42 void VM_CMS_Operation::acquire_pending_list_lock() { | |
43 // The caller may block while communicating | |
44 // with the SLT thread in order to acquire/release the PLL. | |
45 ConcurrentMarkSweepThread::slt()-> | |
46 manipulatePLL(SurrogateLockerThread::acquirePLL); | |
47 } | |
48 | |
49 void VM_CMS_Operation::release_and_notify_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::releaseAndNotifyPLL); | |
54 } | |
55 | |
56 void VM_CMS_Operation::verify_before_gc() { | |
57 if (VerifyBeforeGC && | |
58 GenCollectedHeap::heap()->total_collections() >= VerifyGCStartAt) { | |
59 HandleMark hm; | |
60 FreelistLocker x(_collector); | |
61 MutexLockerEx y(_collector->bitMapLock(), Mutex::_no_safepoint_check_flag); | |
62 Universe::heap()->prepare_for_verify(); | |
63 Universe::verify(true); | |
64 } | |
65 } | |
66 | |
67 void VM_CMS_Operation::verify_after_gc() { | |
68 if (VerifyAfterGC && | |
69 GenCollectedHeap::heap()->total_collections() >= VerifyGCStartAt) { | |
70 HandleMark hm; | |
71 FreelistLocker x(_collector); | |
72 MutexLockerEx y(_collector->bitMapLock(), Mutex::_no_safepoint_check_flag); | |
73 Universe::verify(true); | |
74 } | |
75 } | |
76 | |
77 bool VM_CMS_Operation::lost_race() const { | |
78 if (CMSCollector::abstract_state() == CMSCollector::Idling) { | |
79 // We lost a race to a foreground collection | |
80 // -- there's nothing to do | |
81 return true; | |
82 } | |
83 assert(CMSCollector::abstract_state() == legal_state(), | |
84 "Inconsistent collector state?"); | |
85 return false; | |
86 } | |
87 | |
88 bool VM_CMS_Operation::doit_prologue() { | |
89 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking"); | |
90 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock"); | |
91 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(), | |
92 "Possible deadlock"); | |
93 | |
94 if (needs_pll()) { | |
95 acquire_pending_list_lock(); | |
96 } | |
97 // Get the Heap_lock after the pending_list_lock. | |
98 Heap_lock->lock(); | |
99 if (lost_race()) { | |
100 assert(_prologue_succeeded == false, "Initialized in c'tor"); | |
101 Heap_lock->unlock(); | |
102 if (needs_pll()) { | |
103 release_and_notify_pending_list_lock(); | |
104 } | |
105 } else { | |
106 _prologue_succeeded = true; | |
107 } | |
108 return _prologue_succeeded; | |
109 } | |
110 | |
111 void VM_CMS_Operation::doit_epilogue() { | |
112 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking"); | |
113 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock"); | |
114 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(), | |
115 "Possible deadlock"); | |
116 | |
117 // Release the Heap_lock first. | |
118 Heap_lock->unlock(); | |
119 if (needs_pll()) { | |
120 release_and_notify_pending_list_lock(); | |
121 } | |
122 } | |
123 | |
124 ////////////////////////////////////////////////////////// | |
125 // Methods in class VM_CMS_Initial_Mark | |
126 ////////////////////////////////////////////////////////// | |
127 void VM_CMS_Initial_Mark::doit() { | |
128 if (lost_race()) { | |
129 // Nothing to do. | |
130 return; | |
131 } | |
132 HS_DTRACE_PROBE(hs_private, cms__initmark__begin); | |
133 | |
134 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
135 GCCauseSetter gccs(gch, GCCause::_cms_initial_mark); | |
136 | |
137 VM_CMS_Operation::verify_before_gc(); | |
138 | |
139 IsGCActiveMark x; // stop-world GC active | |
140 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsInitial); | |
141 | |
142 VM_CMS_Operation::verify_after_gc(); | |
143 HS_DTRACE_PROBE(hs_private, cms__initmark__end); | |
144 } | |
145 | |
146 ////////////////////////////////////////////////////////// | |
147 // Methods in class VM_CMS_Final_Remark_Operation | |
148 ////////////////////////////////////////////////////////// | |
149 void VM_CMS_Final_Remark::doit() { | |
150 if (lost_race()) { | |
151 // Nothing to do. | |
152 return; | |
153 } | |
154 HS_DTRACE_PROBE(hs_private, cms__remark__begin); | |
155 | |
156 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
157 GCCauseSetter gccs(gch, GCCause::_cms_final_remark); | |
158 | |
159 VM_CMS_Operation::verify_before_gc(); | |
160 | |
161 IsGCActiveMark x; // stop-world GC active | |
162 _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsFinal); | |
163 | |
164 VM_CMS_Operation::verify_after_gc(); | |
165 HS_DTRACE_PROBE(hs_private, cms__remark__end); | |
166 } | |
167 | |
168 // VM operation to invoke a concurrent collection of a | |
169 // GenCollectedHeap heap. | |
170 void VM_GenCollectFullConcurrent::doit() { | |
171 assert(Thread::current()->is_VM_thread(), "Should be VM thread"); | |
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172 assert(GCLockerInvokesConcurrent || ExplicitGCInvokesConcurrent, "Unexpected"); |
0 | 173 |
174 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
175 if (_gc_count_before == gch->total_collections()) { | |
176 // The "full" of do_full_collection call below "forces" | |
177 // a collection; the second arg, 0, below ensures that | |
178 // only the young gen is collected. XXX In the future, | |
179 // we'll probably need to have something in this interface | |
180 // to say do this only if we are sure we will not bail | |
181 // out to a full collection in this attempt, but that's | |
182 // for the future. | |
183 assert(SafepointSynchronize::is_at_safepoint(), | |
184 "We can only be executing this arm of if at a safepoint"); | |
185 GCCauseSetter gccs(gch, _gc_cause); | |
186 gch->do_full_collection(gch->must_clear_all_soft_refs(), | |
187 0 /* collect only youngest gen */); | |
188 } // Else no need for a foreground young gc | |
189 assert((_gc_count_before < gch->total_collections()) || | |
190 (GC_locker::is_active() /* gc may have been skipped */ | |
191 && (_gc_count_before == gch->total_collections())), | |
192 "total_collections() should be monotonically increasing"); | |
193 | |
194 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
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195 assert(_full_gc_count_before <= gch->total_full_collections(), "Error"); |
0 | 196 if (gch->total_full_collections() == _full_gc_count_before) { |
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197 // Disable iCMS until the full collection is done, and |
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198 // remember that we did so. |
0 | 199 CMSCollector::disable_icms(); |
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200 _disabled_icms = true; |
0 | 201 // In case CMS thread was in icms_wait(), wake it up. |
202 CMSCollector::start_icms(); | |
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203 // Nudge the CMS thread to start a concurrent collection. |
0 | 204 CMSCollector::request_full_gc(_full_gc_count_before); |
205 } else { | |
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206 assert(_full_gc_count_before < gch->total_full_collections(), "Error"); |
0 | 207 FullGCCount_lock->notify_all(); // Inform the Java thread its work is done |
208 } | |
209 } | |
210 | |
211 bool VM_GenCollectFullConcurrent::evaluate_at_safepoint() const { | |
212 Thread* thr = Thread::current(); | |
213 assert(thr != NULL, "Unexpected tid"); | |
214 if (!thr->is_Java_thread()) { | |
215 assert(thr->is_VM_thread(), "Expected to be evaluated by VM thread"); | |
216 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
217 if (_gc_count_before != gch->total_collections()) { | |
218 // No need to do a young gc, we'll just nudge the CMS thread | |
219 // in the doit() method above, to be executed soon. | |
220 assert(_gc_count_before < gch->total_collections(), | |
221 "total_collections() should be monotnically increasing"); | |
222 return false; // no need for foreground young gc | |
223 } | |
224 } | |
225 return true; // may still need foreground young gc | |
226 } | |
227 | |
228 | |
229 void VM_GenCollectFullConcurrent::doit_epilogue() { | |
230 Thread* thr = Thread::current(); | |
231 assert(thr->is_Java_thread(), "just checking"); | |
232 JavaThread* jt = (JavaThread*)thr; | |
233 // Release the Heap_lock first. | |
234 Heap_lock->unlock(); | |
235 release_and_notify_pending_list_lock(); | |
236 | |
237 // It is fine to test whether completed collections has | |
238 // exceeded our request count without locking because | |
239 // the completion count is monotonically increasing; | |
240 // this will break for very long-running apps when the | |
241 // count overflows and wraps around. XXX fix me !!! | |
242 // e.g. at the rate of 1 full gc per ms, this could | |
243 // overflow in about 1000 years. | |
244 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
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245 if (_gc_cause != GCCause::_gc_locker && |
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246 gch->total_full_collections_completed() <= _full_gc_count_before) { |
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247 // maybe we should change the condition to test _gc_cause == |
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248 // GCCause::_java_lang_system_gc, instead of |
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249 // _gc_cause != GCCause::_gc_locker |
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250 assert(_gc_cause == GCCause::_java_lang_system_gc, |
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251 "the only way to get here if this was a System.gc()-induced GC"); |
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252 assert(ExplicitGCInvokesConcurrent, "Error"); |
0 | 253 // Now, wait for witnessing concurrent gc cycle to complete, |
254 // but do so in native mode, because we want to lock the | |
255 // FullGCEvent_lock, which may be needed by the VM thread | |
256 // or by the CMS thread, so we do not want to be suspended | |
257 // while holding that lock. | |
258 ThreadToNativeFromVM native(jt); | |
259 MutexLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
260 // Either a concurrent or a stop-world full gc is sufficient | |
261 // witness to our request. | |
262 while (gch->total_full_collections_completed() <= _full_gc_count_before) { | |
263 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag); | |
264 } | |
265 } | |
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266 // Enable iCMS back if we disabled it earlier. |
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267 if (_disabled_icms) { |
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268 CMSCollector::enable_icms(); |
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269 } |
0 | 270 } |