Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/shared/vmGCOperations.cpp @ 18041:52b4284cb496
Merge with jdk8u20-b26
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 16:02:50 +0200 |
| parents | 4ca6dc0799b6 9c3dc501b5eb |
| children | 7848fc12602b |
| 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 |
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106 // To be able to handle a GC the VM initialization needs to be completed. |
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107 if (!is_init_completed()) { |
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108 vm_exit_during_initialization( |
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109 err_msg("GC triggered before VM initialization completed. Try increasing " |
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110 "NewSize, current value " UINTX_FORMAT "%s.", |
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111 byte_size_in_proper_unit(NewSize), |
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112 proper_unit_for_byte_size(NewSize))); |
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113 } |
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114 |
| 0 | 115 acquire_pending_list_lock(); |
| 116 // If the GC count has changed someone beat us to the collection | |
| 117 // Get the Heap_lock after the pending_list_lock. | |
| 118 Heap_lock->lock(); | |
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119 |
| 0 | 120 // Check invocations |
| 121 if (skip_operation()) { | |
| 122 // skip collection | |
| 123 Heap_lock->unlock(); | |
| 124 release_and_notify_pending_list_lock(); | |
| 125 _prologue_succeeded = false; | |
| 126 } else { | |
| 127 _prologue_succeeded = true; | |
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128 SharedHeap* sh = SharedHeap::heap(); |
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129 if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = true; |
| 0 | 130 } |
| 131 return _prologue_succeeded; | |
| 132 } | |
| 133 | |
| 134 | |
| 135 void VM_GC_Operation::doit_epilogue() { | |
| 136 assert(Thread::current()->is_Java_thread(), "just checking"); | |
| 137 // Release the Heap_lock first. | |
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138 SharedHeap* sh = SharedHeap::heap(); |
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139 if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = false; |
| 0 | 140 Heap_lock->unlock(); |
| 141 release_and_notify_pending_list_lock(); | |
| 142 } | |
| 143 | |
| 144 bool VM_GC_HeapInspection::doit_prologue() { | |
| 145 if (Universe::heap()->supports_heap_inspection()) { | |
| 146 return VM_GC_Operation::doit_prologue(); | |
| 147 } else { | |
| 148 return false; | |
| 149 } | |
| 150 } | |
| 151 | |
| 152 bool VM_GC_HeapInspection::skip_operation() const { | |
| 153 assert(Universe::heap()->supports_heap_inspection(), "huh?"); | |
| 154 return false; | |
| 155 } | |
| 156 | |
| 10405 | 157 bool VM_GC_HeapInspection::collect() { |
| 158 if (GC_locker::is_active()) { | |
| 159 return false; | |
| 160 } | |
| 161 Universe::heap()->collect_as_vm_thread(GCCause::_heap_inspection); | |
| 162 return true; | |
| 163 } | |
| 164 | |
| 0 | 165 void VM_GC_HeapInspection::doit() { |
| 166 HandleMark hm; | |
| 10405 | 167 Universe::heap()->ensure_parsability(false); // must happen, even if collection does |
| 168 // not happen (e.g. due to GC_locker) | |
| 169 // or _full_gc being false | |
| 0 | 170 if (_full_gc) { |
| 10405 | 171 if (!collect()) { |
| 172 // The collection attempt was skipped because the gc locker is held. | |
| 173 // The following dump may then be a tad misleading to someone expecting | |
| 174 // only live objects to show up in the dump (see CR 6944195). Just issue | |
| 175 // a suitable warning in that case and do not attempt to do a collection. | |
| 176 // The latter is a subtle point, because even a failed attempt | |
| 177 // to GC will, in fact, induce one in the future, which we | |
| 178 // probably want to avoid in this case because the GC that we may | |
| 179 // be about to attempt holds value for us only | |
| 180 // if it happens now and not if it happens in the eventual | |
| 181 // future. | |
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182 warning("GC locker is held; pre-dump GC was skipped"); |
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183 } |
| 0 | 184 } |
| 7956 | 185 HeapInspection inspect(_csv_format, _print_help, _print_class_stats, |
| 186 _columns); | |
| 10405 | 187 inspect.heap_inspection(_out); |
| 0 | 188 } |
| 189 | |
| 190 | |
| 191 void VM_GenCollectForAllocation::doit() { | |
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192 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
| 0 | 193 |
| 194 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 195 GCCauseSetter gccs(gch, _gc_cause); | |
| 196 _res = gch->satisfy_failed_allocation(_size, _tlab); | |
| 197 assert(gch->is_in_reserved_or_null(_res), "result not in heap"); | |
| 198 | |
| 199 if (_res == NULL && GC_locker::is_active_and_needs_gc()) { | |
| 200 set_gc_locked(); | |
| 201 } | |
| 202 } | |
| 203 | |
| 204 void VM_GenCollectFull::doit() { | |
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205 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 0 | 206 |
| 207 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 208 GCCauseSetter gccs(gch, _gc_cause); | |
| 209 gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_level); | |
| 210 } | |
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211 |
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212 void VM_CollectForMetadataAllocation::doit() { |
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213 SvcGCMarker sgcm(SvcGCMarker::FULL); |
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214 |
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215 CollectedHeap* heap = Universe::heap(); |
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216 GCCauseSetter gccs(heap, _gc_cause); |
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217 |
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218 // Check again if the space is available. Another thread |
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219 // may have similarly failed a metadata allocation and induced |
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220 // a GC that freed space for the allocation. |
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221 if (!MetadataAllocationFailALot) { |
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222 _result = _loader_data->metaspace_non_null()->allocate(_size, _mdtype); |
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223 } |
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224 |
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225 if (_result == NULL) { |
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226 if (UseConcMarkSweepGC) { |
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227 if (CMSClassUnloadingEnabled) { |
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228 MetaspaceGC::set_should_concurrent_collect(true); |
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229 } |
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230 // For CMS expand since the collection is going to be concurrent. |
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231 _result = |
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232 _loader_data->metaspace_non_null()->expand_and_allocate(_size, _mdtype); |
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233 } |
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234 if (_result == NULL) { |
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235 // Don't clear the soft refs yet. |
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236 if (Verbose && PrintGCDetails && UseConcMarkSweepGC) { |
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237 gclog_or_tty->print_cr("\nCMS full GC for Metaspace"); |
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238 } |
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239 heap->collect_as_vm_thread(GCCause::_metadata_GC_threshold); |
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240 // After a GC try to allocate without expanding. Could fail |
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241 // and expansion will be tried below. |
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242 _result = |
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243 _loader_data->metaspace_non_null()->allocate(_size, _mdtype); |
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244 } |
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245 if (_result == NULL) { |
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246 // If still failing, allow the Metaspace to expand. |
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247 // See delta_capacity_until_GC() for explanation of the |
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248 // amount of the expansion. |
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249 // This should work unless there really is no more space |
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250 // or a MaxMetaspaceSize has been specified on the command line. |
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251 _result = |
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252 _loader_data->metaspace_non_null()->expand_and_allocate(_size, _mdtype); |
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253 if (_result == NULL) { |
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254 // If expansion failed, do a last-ditch collection and try allocating |
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255 // again. A last-ditch collection will clear softrefs. This |
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256 // behavior is similar to the last-ditch collection done for perm |
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257 // gen when it was full and a collection for failed allocation |
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258 // did not free perm gen space. |
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259 heap->collect_as_vm_thread(GCCause::_last_ditch_collection); |
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260 _result = |
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261 _loader_data->metaspace_non_null()->allocate(_size, _mdtype); |
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262 } |
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263 } |
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264 if (Verbose && PrintGCDetails && _result == NULL) { |
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265 gclog_or_tty->print_cr("\nAfter Metaspace GC failed to allocate size " |
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266 SIZE_FORMAT, _size); |
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267 } |
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268 } |
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269 |
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270 if (_result == NULL && GC_locker::is_active_and_needs_gc()) { |
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271 set_gc_locked(); |
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272 } |
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273 } |