Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/shared/vmGCOperations.cpp @ 10405:f2110083203d
8005849: JEP 167: Event-Based JVM Tracing
Reviewed-by: acorn, coleenp, sla
Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>
| author | sla |
|---|---|
| date | Mon, 10 Jun 2013 11:30:51 +0200 |
| parents | 868d87ed63c8 |
| children | bf9e50c573ad |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 7956 | 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 "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" | |
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39 #include "utilities/macros.hpp" |
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40 #if INCLUDE_ALL_GCS |
| 1972 | 41 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
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42 #endif // INCLUDE_ALL_GCS |
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43 |
| 4006 | 44 #ifndef USDT2 |
| 0 | 45 HS_DTRACE_PROBE_DECL1(hotspot, gc__begin, bool); |
| 46 HS_DTRACE_PROBE_DECL(hotspot, gc__end); | |
| 4006 | 47 #endif /* !USDT2 */ |
| 0 | 48 |
| 49 // The same dtrace probe can't be inserted in two different files, so we | |
| 50 // have to call it here, so it's only in one file. Can't create new probes | |
| 51 // for the other file anymore. The dtrace probes have to remain stable. | |
| 52 void VM_GC_Operation::notify_gc_begin(bool full) { | |
| 4006 | 53 #ifndef USDT2 |
| 0 | 54 HS_DTRACE_PROBE1(hotspot, gc__begin, full); |
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55 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); |
| 4006 | 56 #else /* USDT2 */ |
| 57 HOTSPOT_GC_BEGIN( | |
| 58 full); | |
| 59 #endif /* USDT2 */ | |
| 0 | 60 } |
| 61 | |
| 62 void VM_GC_Operation::notify_gc_end() { | |
| 4006 | 63 #ifndef USDT2 |
| 0 | 64 HS_DTRACE_PROBE(hotspot, gc__end); |
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65 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); |
| 4006 | 66 #else /* USDT2 */ |
| 67 HOTSPOT_GC_END( | |
| 68 ); | |
| 69 #endif /* USDT2 */ | |
| 0 | 70 } |
| 71 | |
| 72 void VM_GC_Operation::acquire_pending_list_lock() { | |
| 73 // we may enter this with pending exception set | |
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74 InstanceRefKlass::acquire_pending_list_lock(&_pending_list_basic_lock); |
| 0 | 75 } |
| 76 | |
| 77 | |
| 78 void VM_GC_Operation::release_and_notify_pending_list_lock() { | |
| 79 | |
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80 InstanceRefKlass::release_and_notify_pending_list_lock(&_pending_list_basic_lock); |
| 0 | 81 } |
| 82 | |
| 83 // Allocations may fail in several threads at about the same time, | |
| 84 // resulting in multiple gc requests. We only want to do one of them. | |
| 85 // In case a GC locker is active and the need for a GC is already signalled, | |
| 86 // we want to skip this GC attempt altogether, without doing a futile | |
| 87 // safepoint operation. | |
| 88 bool VM_GC_Operation::skip_operation() const { | |
| 89 bool skip = (_gc_count_before != Universe::heap()->total_collections()); | |
| 90 if (_full && skip) { | |
| 91 skip = (_full_gc_count_before != Universe::heap()->total_full_collections()); | |
| 92 } | |
| 93 if (!skip && GC_locker::is_active_and_needs_gc()) { | |
| 94 skip = Universe::heap()->is_maximal_no_gc(); | |
| 95 assert(!(skip && (_gc_cause == GCCause::_gc_locker)), | |
| 96 "GC_locker cannot be active when initiating GC"); | |
| 97 } | |
| 98 return skip; | |
| 99 } | |
| 100 | |
| 101 bool VM_GC_Operation::doit_prologue() { | |
| 102 assert(Thread::current()->is_Java_thread(), "just checking"); | |
| 2225 | 103 assert(((_gc_cause != GCCause::_no_gc) && |
| 104 (_gc_cause != GCCause::_no_cause_specified)), "Illegal GCCause"); | |
| 0 | 105 |
| 106 acquire_pending_list_lock(); | |
| 107 // If the GC count has changed someone beat us to the collection | |
| 108 // Get the Heap_lock after the pending_list_lock. | |
| 109 Heap_lock->lock(); | |
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110 |
| 0 | 111 // Check invocations |
| 112 if (skip_operation()) { | |
| 113 // skip collection | |
| 114 Heap_lock->unlock(); | |
| 115 release_and_notify_pending_list_lock(); | |
| 116 _prologue_succeeded = false; | |
| 117 } else { | |
| 118 _prologue_succeeded = true; | |
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119 SharedHeap* sh = SharedHeap::heap(); |
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120 if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = true; |
| 0 | 121 } |
| 122 return _prologue_succeeded; | |
| 123 } | |
| 124 | |
| 125 | |
| 126 void VM_GC_Operation::doit_epilogue() { | |
| 127 assert(Thread::current()->is_Java_thread(), "just checking"); | |
| 128 // Release the Heap_lock first. | |
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129 SharedHeap* sh = SharedHeap::heap(); |
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130 if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = false; |
| 0 | 131 Heap_lock->unlock(); |
| 132 release_and_notify_pending_list_lock(); | |
| 133 } | |
| 134 | |
| 135 bool VM_GC_HeapInspection::doit_prologue() { | |
| 136 if (Universe::heap()->supports_heap_inspection()) { | |
| 137 return VM_GC_Operation::doit_prologue(); | |
| 138 } else { | |
| 139 return false; | |
| 140 } | |
| 141 } | |
| 142 | |
| 143 bool VM_GC_HeapInspection::skip_operation() const { | |
| 144 assert(Universe::heap()->supports_heap_inspection(), "huh?"); | |
| 145 return false; | |
| 146 } | |
| 147 | |
| 10405 | 148 bool VM_GC_HeapInspection::collect() { |
| 149 if (GC_locker::is_active()) { | |
| 150 return false; | |
| 151 } | |
| 152 Universe::heap()->collect_as_vm_thread(GCCause::_heap_inspection); | |
| 153 return true; | |
| 154 } | |
| 155 | |
| 0 | 156 void VM_GC_HeapInspection::doit() { |
| 157 HandleMark hm; | |
| 10405 | 158 Universe::heap()->ensure_parsability(false); // must happen, even if collection does |
| 159 // not happen (e.g. due to GC_locker) | |
| 160 // or _full_gc being false | |
| 0 | 161 if (_full_gc) { |
| 10405 | 162 if (!collect()) { |
| 163 // The collection attempt was skipped because the gc locker is held. | |
| 164 // The following dump may then be a tad misleading to someone expecting | |
| 165 // only live objects to show up in the dump (see CR 6944195). Just issue | |
| 166 // a suitable warning in that case and do not attempt to do a collection. | |
| 167 // The latter is a subtle point, because even a failed attempt | |
| 168 // to GC will, in fact, induce one in the future, which we | |
| 169 // probably want to avoid in this case because the GC that we may | |
| 170 // be about to attempt holds value for us only | |
| 171 // if it happens now and not if it happens in the eventual | |
| 172 // future. | |
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173 warning("GC locker is held; pre-dump GC was skipped"); |
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174 } |
| 0 | 175 } |
| 7956 | 176 HeapInspection inspect(_csv_format, _print_help, _print_class_stats, |
| 177 _columns); | |
| 10405 | 178 inspect.heap_inspection(_out); |
| 0 | 179 } |
| 180 | |
| 181 | |
| 182 void VM_GenCollectForAllocation::doit() { | |
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183 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
| 0 | 184 |
| 185 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 186 GCCauseSetter gccs(gch, _gc_cause); | |
| 187 _res = gch->satisfy_failed_allocation(_size, _tlab); | |
| 188 assert(gch->is_in_reserved_or_null(_res), "result not in heap"); | |
| 189 | |
| 190 if (_res == NULL && GC_locker::is_active_and_needs_gc()) { | |
| 191 set_gc_locked(); | |
| 192 } | |
| 193 } | |
| 194 | |
| 195 void VM_GenCollectFull::doit() { | |
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196 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 0 | 197 |
| 198 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 199 GCCauseSetter gccs(gch, _gc_cause); | |
| 200 gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_level); | |
| 201 } | |
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202 |
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203 void VM_CollectForMetadataAllocation::doit() { |
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204 SvcGCMarker sgcm(SvcGCMarker::FULL); |
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205 |
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206 CollectedHeap* heap = Universe::heap(); |
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207 GCCauseSetter gccs(heap, _gc_cause); |
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208 |
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209 // Check again if the space is available. Another thread |
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210 // may have similarly failed a metadata allocation and induced |
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211 // a GC that freed space for the allocation. |
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212 if (!MetadataAllocationFailALot) { |
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213 _result = _loader_data->metaspace_non_null()->allocate(_size, _mdtype); |
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214 } |
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215 |
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216 if (_result == NULL) { |
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217 if (UseConcMarkSweepGC) { |
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218 if (CMSClassUnloadingEnabled) { |
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219 MetaspaceGC::set_should_concurrent_collect(true); |
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220 } |
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221 // For CMS expand since the collection is going to be concurrent. |
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222 _result = |
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223 _loader_data->metaspace_non_null()->expand_and_allocate(_size, _mdtype); |
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224 } |
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225 if (_result == NULL) { |
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226 // Don't clear the soft refs. This GC is for reclaiming metadata |
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227 // and is unrelated to the fullness of the Java heap which should |
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228 // be the criteria for clearing SoftReferences. |
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229 if (Verbose && PrintGCDetails && UseConcMarkSweepGC) { |
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230 gclog_or_tty->print_cr("\nCMS full GC for Metaspace"); |
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231 } |
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232 heap->collect_as_vm_thread(GCCause::_metadata_GC_threshold); |
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233 // After a GC try to allocate without expanding. Could fail |
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234 // and expansion will be tried below. |
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235 _result = |
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236 _loader_data->metaspace_non_null()->allocate(_size, _mdtype); |
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237 } |
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238 if (_result == NULL && !UseConcMarkSweepGC /* CMS already tried */) { |
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239 // If still failing, allow the Metaspace to expand. |
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240 // See delta_capacity_until_GC() for explanation of the |
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241 // amount of the expansion. |
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242 // This should work unless there really is no more space |
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243 // or a MaxMetaspaceSize has been specified on the command line. |
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244 _result = |
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245 _loader_data->metaspace_non_null()->expand_and_allocate(_size, _mdtype); |
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246 |
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247 } |
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248 if (Verbose && PrintGCDetails && _result == NULL) { |
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249 gclog_or_tty->print_cr("\nAfter Metaspace GC failed to allocate size " |
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097d78aaf2b5
7198873: NPG: VM Does not unload classes with UseConcMarkSweepGC
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250 SIZE_FORMAT, _size); |
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342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
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251 } |
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37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
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252 } |
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6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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253 |
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da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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254 if (_result == NULL && GC_locker::is_active_and_needs_gc()) { |
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c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
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255 set_gc_locked(); |
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c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
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256 } |
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6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
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257 } |