Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/shared/vmGCOperations.cpp @ 6948:e522a00b91aa
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/ after NPG - C++ build works
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 12 Nov 2012 23:14:12 +0100 |
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children | 16fb9f942703 db9981fd3124 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2012, 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 "classfile/classLoader.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "gc_implementation/shared/vmGCOperations.hpp" | |
29 #include "memory/gcLocker.inline.hpp" | |
30 #include "memory/genCollectedHeap.hpp" | |
31 #include "memory/oopFactory.hpp" | |
32 #include "oops/instanceKlass.hpp" | |
33 #include "oops/instanceRefKlass.hpp" | |
34 #include "runtime/handles.inline.hpp" | |
35 #include "runtime/init.hpp" | |
36 #include "runtime/interfaceSupport.hpp" | |
37 #include "utilities/dtrace.hpp" | |
38 #include "utilities/preserveException.hpp" | |
39 #ifndef SERIALGC | |
40 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
41 #endif | |
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42 |
4006 | 43 #ifndef USDT2 |
0 | 44 HS_DTRACE_PROBE_DECL1(hotspot, gc__begin, bool); |
45 HS_DTRACE_PROBE_DECL(hotspot, gc__end); | |
4006 | 46 #endif /* !USDT2 */ |
0 | 47 |
48 // The same dtrace probe can't be inserted in two different files, so we | |
49 // have to call it here, so it's only in one file. Can't create new probes | |
50 // for the other file anymore. The dtrace probes have to remain stable. | |
51 void VM_GC_Operation::notify_gc_begin(bool full) { | |
4006 | 52 #ifndef USDT2 |
0 | 53 HS_DTRACE_PROBE1(hotspot, gc__begin, full); |
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54 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); |
4006 | 55 #else /* USDT2 */ |
56 HOTSPOT_GC_BEGIN( | |
57 full); | |
58 #endif /* USDT2 */ | |
0 | 59 } |
60 | |
61 void VM_GC_Operation::notify_gc_end() { | |
4006 | 62 #ifndef USDT2 |
0 | 63 HS_DTRACE_PROBE(hotspot, gc__end); |
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64 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); |
4006 | 65 #else /* USDT2 */ |
66 HOTSPOT_GC_END( | |
67 ); | |
68 #endif /* USDT2 */ | |
0 | 69 } |
70 | |
71 void VM_GC_Operation::acquire_pending_list_lock() { | |
72 // we may enter this with pending exception set | |
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73 InstanceRefKlass::acquire_pending_list_lock(&_pending_list_basic_lock); |
0 | 74 } |
75 | |
76 | |
77 void VM_GC_Operation::release_and_notify_pending_list_lock() { | |
78 | |
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79 InstanceRefKlass::release_and_notify_pending_list_lock(&_pending_list_basic_lock); |
0 | 80 } |
81 | |
82 // Allocations may fail in several threads at about the same time, | |
83 // resulting in multiple gc requests. We only want to do one of them. | |
84 // In case a GC locker is active and the need for a GC is already signalled, | |
85 // we want to skip this GC attempt altogether, without doing a futile | |
86 // safepoint operation. | |
87 bool VM_GC_Operation::skip_operation() const { | |
88 bool skip = (_gc_count_before != Universe::heap()->total_collections()); | |
89 if (_full && skip) { | |
90 skip = (_full_gc_count_before != Universe::heap()->total_full_collections()); | |
91 } | |
92 if (!skip && GC_locker::is_active_and_needs_gc()) { | |
93 skip = Universe::heap()->is_maximal_no_gc(); | |
94 assert(!(skip && (_gc_cause == GCCause::_gc_locker)), | |
95 "GC_locker cannot be active when initiating GC"); | |
96 } | |
97 return skip; | |
98 } | |
99 | |
100 bool VM_GC_Operation::doit_prologue() { | |
101 assert(Thread::current()->is_Java_thread(), "just checking"); | |
2225 | 102 assert(((_gc_cause != GCCause::_no_gc) && |
103 (_gc_cause != GCCause::_no_cause_specified)), "Illegal GCCause"); | |
0 | 104 |
105 acquire_pending_list_lock(); | |
106 // If the GC count has changed someone beat us to the collection | |
107 // Get the Heap_lock after the pending_list_lock. | |
108 Heap_lock->lock(); | |
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109 |
0 | 110 // Check invocations |
111 if (skip_operation()) { | |
112 // skip collection | |
113 Heap_lock->unlock(); | |
114 release_and_notify_pending_list_lock(); | |
115 _prologue_succeeded = false; | |
116 } else { | |
117 _prologue_succeeded = true; | |
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118 SharedHeap* sh = SharedHeap::heap(); |
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119 if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = true; |
0 | 120 } |
121 return _prologue_succeeded; | |
122 } | |
123 | |
124 | |
125 void VM_GC_Operation::doit_epilogue() { | |
126 assert(Thread::current()->is_Java_thread(), "just checking"); | |
127 // Release the Heap_lock first. | |
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128 SharedHeap* sh = SharedHeap::heap(); |
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129 if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = false; |
0 | 130 Heap_lock->unlock(); |
131 release_and_notify_pending_list_lock(); | |
132 } | |
133 | |
134 bool VM_GC_HeapInspection::doit_prologue() { | |
135 if (Universe::heap()->supports_heap_inspection()) { | |
136 return VM_GC_Operation::doit_prologue(); | |
137 } else { | |
138 return false; | |
139 } | |
140 } | |
141 | |
142 bool VM_GC_HeapInspection::skip_operation() const { | |
143 assert(Universe::heap()->supports_heap_inspection(), "huh?"); | |
144 return false; | |
145 } | |
146 | |
147 void VM_GC_HeapInspection::doit() { | |
148 HandleMark hm; | |
149 CollectedHeap* ch = Universe::heap(); | |
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150 ch->ensure_parsability(false); // must happen, even if collection does |
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151 // not happen (e.g. due to GC_locker) |
0 | 152 if (_full_gc) { |
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153 // The collection attempt below would be skipped anyway if |
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154 // the gc locker is held. The following dump may then be a tad |
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155 // misleading to someone expecting only live objects to show |
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156 // up in the dump (see CR 6944195). Just issue a suitable warning |
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157 // in that case and do not attempt to do a collection. |
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158 // The latter is a subtle point, because even a failed attempt |
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159 // to GC will, in fact, induce one in the future, which we |
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160 // probably want to avoid in this case because the GC that we may |
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161 // be about to attempt holds value for us only |
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162 // if it happens now and not if it happens in the eventual |
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163 // future. |
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164 if (GC_locker::is_active()) { |
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165 warning("GC locker is held; pre-dump GC was skipped"); |
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166 } else { |
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167 ch->collect_as_vm_thread(GCCause::_heap_inspection); |
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168 } |
0 | 169 } |
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170 HeapInspection::heap_inspection(_out, _need_prologue /* need_prologue */); |
0 | 171 } |
172 | |
173 | |
174 void VM_GenCollectForAllocation::doit() { | |
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175 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
0 | 176 |
177 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
178 GCCauseSetter gccs(gch, _gc_cause); | |
179 _res = gch->satisfy_failed_allocation(_size, _tlab); | |
180 assert(gch->is_in_reserved_or_null(_res), "result not in heap"); | |
181 | |
182 if (_res == NULL && GC_locker::is_active_and_needs_gc()) { | |
183 set_gc_locked(); | |
184 } | |
185 } | |
186 | |
187 void VM_GenCollectFull::doit() { | |
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188 SvcGCMarker sgcm(SvcGCMarker::FULL); |
0 | 189 |
190 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
191 GCCauseSetter gccs(gch, _gc_cause); | |
192 gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_level); | |
193 } | |
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194 |
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195 void VM_CollectForMetadataAllocation::doit() { |
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196 SvcGCMarker sgcm(SvcGCMarker::FULL); |
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197 |
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198 CollectedHeap* heap = Universe::heap(); |
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199 GCCauseSetter gccs(heap, _gc_cause); |
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200 |
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201 // Check again if the space is available. Another thread |
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202 // may have similarly failed a metadata allocation and induced |
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203 // a GC that freed space for the allocation. |
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204 if (!MetadataAllocationFailALot) { |
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205 _result = _loader_data->metaspace_non_null()->allocate(_size, _mdtype); |
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206 } |
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207 |
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208 if (_result == NULL) { |
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209 if (UseConcMarkSweepGC) { |
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210 if (CMSClassUnloadingEnabled) { |
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211 MetaspaceGC::set_should_concurrent_collect(true); |
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212 } |
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213 // For CMS expand since the collection is going to be concurrent. |
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214 _result = |
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215 _loader_data->metaspace_non_null()->expand_and_allocate(_size, _mdtype); |
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216 } |
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217 if (_result == NULL) { |
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218 // Don't clear the soft refs. This GC is for reclaiming metadata |
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219 // and is unrelated to the fullness of the Java heap which should |
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220 // be the criteria for clearing SoftReferences. |
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221 if (Verbose && PrintGCDetails && UseConcMarkSweepGC) { |
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222 gclog_or_tty->print_cr("\nCMS full GC for Metaspace"); |
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223 } |
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224 heap->collect_as_vm_thread(GCCause::_metadata_GC_threshold); |
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225 _result = _loader_data->metaspace_non_null()->allocate(_size, _mdtype); |
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226 } |
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227 if (_result == NULL && !UseConcMarkSweepGC /* CMS already tried */) { |
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228 // If still failing, allow the Metaspace to expand. |
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229 // See delta_capacity_until_GC() for explanation of the |
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230 // amount of the expansion. |
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231 // This should work unless there really is no more space |
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232 // or a MaxMetaspaceSize has been specified on the command line. |
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233 _result = |
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234 _loader_data->metaspace_non_null()->expand_and_allocate(_size, _mdtype); |
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235 |
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236 } |
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237 if (Verbose && PrintGCDetails && _result == NULL) { |
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238 gclog_or_tty->print_cr("\nAfter Metaspace GC failed to allocate size " |
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239 SIZE_FORMAT, _size); |
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240 } |
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241 } |
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6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
4006
diff
changeset
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242 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
4006
diff
changeset
|
243 if (_result == NULL && GC_locker::is_active_and_needs_gc()) { |
139
c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
0
diff
changeset
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244 set_gc_locked(); |
c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
0
diff
changeset
|
245 } |
c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
0
diff
changeset
|
246 } |