Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/shared/vmGCOperations.cpp @ 14380:e6195383bcaf
8034080: Remove the USDT1 dtrace code from Hotspot
Reviewed-by: dholmes, coleenp
| author | sla |
|---|---|
| date | Tue, 18 Feb 2014 09:15:40 +0100 |
| parents | 2c95095271e9 |
| children | 4ca6dc0799b6 |
| 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 |
| 0 | 44 // The same dtrace probe can't be inserted in two different files, so we |
| 45 // have to call it here, so it's only in one file. Can't create new probes | |
| 46 // for the other file anymore. The dtrace probes have to remain stable. | |
| 47 void VM_GC_Operation::notify_gc_begin(bool full) { | |
| 4006 | 48 HOTSPOT_GC_BEGIN( |
| 49 full); | |
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50 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); |
| 0 | 51 } |
| 52 | |
| 53 void VM_GC_Operation::notify_gc_end() { | |
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54 HOTSPOT_GC_END(); |
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55 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); |
| 0 | 56 } |
| 57 | |
| 58 void VM_GC_Operation::acquire_pending_list_lock() { | |
| 59 // we may enter this with pending exception set | |
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60 InstanceRefKlass::acquire_pending_list_lock(&_pending_list_basic_lock); |
| 0 | 61 } |
| 62 | |
| 63 | |
| 64 void VM_GC_Operation::release_and_notify_pending_list_lock() { | |
| 65 | |
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66 InstanceRefKlass::release_and_notify_pending_list_lock(&_pending_list_basic_lock); |
| 0 | 67 } |
| 68 | |
| 69 // Allocations may fail in several threads at about the same time, | |
| 70 // resulting in multiple gc requests. We only want to do one of them. | |
| 14309 | 71 // In case a GC locker is active and the need for a GC is already signaled, |
| 0 | 72 // we want to skip this GC attempt altogether, without doing a futile |
| 73 // safepoint operation. | |
| 74 bool VM_GC_Operation::skip_operation() const { | |
| 75 bool skip = (_gc_count_before != Universe::heap()->total_collections()); | |
| 76 if (_full && skip) { | |
| 77 skip = (_full_gc_count_before != Universe::heap()->total_full_collections()); | |
| 78 } | |
| 79 if (!skip && GC_locker::is_active_and_needs_gc()) { | |
| 80 skip = Universe::heap()->is_maximal_no_gc(); | |
| 81 assert(!(skip && (_gc_cause == GCCause::_gc_locker)), | |
| 82 "GC_locker cannot be active when initiating GC"); | |
| 83 } | |
| 84 return skip; | |
| 85 } | |
| 86 | |
| 87 bool VM_GC_Operation::doit_prologue() { | |
| 88 assert(Thread::current()->is_Java_thread(), "just checking"); | |
| 2225 | 89 assert(((_gc_cause != GCCause::_no_gc) && |
| 90 (_gc_cause != GCCause::_no_cause_specified)), "Illegal GCCause"); | |
| 0 | 91 |
| 92 acquire_pending_list_lock(); | |
| 93 // If the GC count has changed someone beat us to the collection | |
| 94 // Get the Heap_lock after the pending_list_lock. | |
| 95 Heap_lock->lock(); | |
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96 |
| 0 | 97 // Check invocations |
| 98 if (skip_operation()) { | |
| 99 // skip collection | |
| 100 Heap_lock->unlock(); | |
| 101 release_and_notify_pending_list_lock(); | |
| 102 _prologue_succeeded = false; | |
| 103 } else { | |
| 104 _prologue_succeeded = true; | |
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105 SharedHeap* sh = SharedHeap::heap(); |
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106 if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = true; |
| 0 | 107 } |
| 108 return _prologue_succeeded; | |
| 109 } | |
| 110 | |
| 111 | |
| 112 void VM_GC_Operation::doit_epilogue() { | |
| 113 assert(Thread::current()->is_Java_thread(), "just checking"); | |
| 114 // Release the Heap_lock first. | |
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115 SharedHeap* sh = SharedHeap::heap(); |
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116 if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = false; |
| 0 | 117 Heap_lock->unlock(); |
| 118 release_and_notify_pending_list_lock(); | |
| 119 } | |
| 120 | |
| 121 bool VM_GC_HeapInspection::doit_prologue() { | |
| 122 if (Universe::heap()->supports_heap_inspection()) { | |
| 123 return VM_GC_Operation::doit_prologue(); | |
| 124 } else { | |
| 125 return false; | |
| 126 } | |
| 127 } | |
| 128 | |
| 129 bool VM_GC_HeapInspection::skip_operation() const { | |
| 130 assert(Universe::heap()->supports_heap_inspection(), "huh?"); | |
| 131 return false; | |
| 132 } | |
| 133 | |
| 10405 | 134 bool VM_GC_HeapInspection::collect() { |
| 135 if (GC_locker::is_active()) { | |
| 136 return false; | |
| 137 } | |
| 138 Universe::heap()->collect_as_vm_thread(GCCause::_heap_inspection); | |
| 139 return true; | |
| 140 } | |
| 141 | |
| 0 | 142 void VM_GC_HeapInspection::doit() { |
| 143 HandleMark hm; | |
| 10405 | 144 Universe::heap()->ensure_parsability(false); // must happen, even if collection does |
| 145 // not happen (e.g. due to GC_locker) | |
| 146 // or _full_gc being false | |
| 0 | 147 if (_full_gc) { |
| 10405 | 148 if (!collect()) { |
| 149 // The collection attempt was skipped because the gc locker is held. | |
| 150 // The following dump may then be a tad misleading to someone expecting | |
| 151 // only live objects to show up in the dump (see CR 6944195). Just issue | |
| 152 // a suitable warning in that case and do not attempt to do a collection. | |
| 153 // The latter is a subtle point, because even a failed attempt | |
| 154 // to GC will, in fact, induce one in the future, which we | |
| 155 // probably want to avoid in this case because the GC that we may | |
| 156 // be about to attempt holds value for us only | |
| 157 // if it happens now and not if it happens in the eventual | |
| 158 // future. | |
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159 warning("GC locker is held; pre-dump GC was skipped"); |
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160 } |
| 0 | 161 } |
| 7956 | 162 HeapInspection inspect(_csv_format, _print_help, _print_class_stats, |
| 163 _columns); | |
| 10405 | 164 inspect.heap_inspection(_out); |
| 0 | 165 } |
| 166 | |
| 167 | |
| 168 void VM_GenCollectForAllocation::doit() { | |
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169 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
| 0 | 170 |
| 171 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 172 GCCauseSetter gccs(gch, _gc_cause); | |
| 173 _res = gch->satisfy_failed_allocation(_size, _tlab); | |
| 174 assert(gch->is_in_reserved_or_null(_res), "result not in heap"); | |
| 175 | |
| 176 if (_res == NULL && GC_locker::is_active_and_needs_gc()) { | |
| 177 set_gc_locked(); | |
| 178 } | |
| 179 } | |
| 180 | |
| 181 void VM_GenCollectFull::doit() { | |
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182 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 0 | 183 |
| 184 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 185 GCCauseSetter gccs(gch, _gc_cause); | |
| 186 gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_level); | |
| 187 } | |
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188 |
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189 void VM_CollectForMetadataAllocation::doit() { |
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190 SvcGCMarker sgcm(SvcGCMarker::FULL); |
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191 |
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192 CollectedHeap* heap = Universe::heap(); |
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193 GCCauseSetter gccs(heap, _gc_cause); |
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194 |
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195 // Check again if the space is available. Another thread |
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196 // may have similarly failed a metadata allocation and induced |
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197 // a GC that freed space for the allocation. |
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198 if (!MetadataAllocationFailALot) { |
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199 _result = _loader_data->metaspace_non_null()->allocate(_size, _mdtype); |
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200 } |
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201 |
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202 if (_result == NULL) { |
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203 if (UseConcMarkSweepGC) { |
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204 if (CMSClassUnloadingEnabled) { |
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205 MetaspaceGC::set_should_concurrent_collect(true); |
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206 } |
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207 // For CMS expand since the collection is going to be concurrent. |
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208 _result = |
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209 _loader_data->metaspace_non_null()->expand_and_allocate(_size, _mdtype); |
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210 } |
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211 if (_result == NULL) { |
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212 // Don't clear the soft refs yet. |
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213 if (Verbose && PrintGCDetails && UseConcMarkSweepGC) { |
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214 gclog_or_tty->print_cr("\nCMS full GC for Metaspace"); |
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215 } |
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216 heap->collect_as_vm_thread(GCCause::_metadata_GC_threshold); |
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217 // After a GC try to allocate without expanding. Could fail |
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218 // and expansion will be tried below. |
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219 _result = |
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220 _loader_data->metaspace_non_null()->allocate(_size, _mdtype); |
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221 } |
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222 if (_result == NULL) { |
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223 // If still failing, allow the Metaspace to expand. |
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224 // See delta_capacity_until_GC() for explanation of the |
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225 // amount of the expansion. |
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226 // This should work unless there really is no more space |
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227 // or a MaxMetaspaceSize has been specified on the command line. |
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228 _result = |
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229 _loader_data->metaspace_non_null()->expand_and_allocate(_size, _mdtype); |
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230 if (_result == NULL) { |
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231 // If expansion failed, do a last-ditch collection and try allocating |
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232 // again. A last-ditch collection will clear softrefs. This |
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233 // behavior is similar to the last-ditch collection done for perm |
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234 // gen when it was full and a collection for failed allocation |
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235 // did not free perm gen space. |
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236 heap->collect_as_vm_thread(GCCause::_last_ditch_collection); |
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237 _result = |
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238 _loader_data->metaspace_non_null()->allocate(_size, _mdtype); |
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239 } |
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240 } |
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241 if (Verbose && PrintGCDetails && _result == NULL) { |
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7198873: NPG: VM Does not unload classes with UseConcMarkSweepGC
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242 gclog_or_tty->print_cr("\nAfter Metaspace GC failed to allocate size " |
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243 SIZE_FORMAT, _size); |
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342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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244 } |
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245 } |
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6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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246 |
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247 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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248 set_gc_locked(); |
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249 } |
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250 } |