Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/shared/vmGCOperations.cpp @ 4006:436b4a3231bf
7098194: integrate macosx-port changes
Summary: Integrate bsd-port/hotspot and macosx-port/hotspot changes as of 2011.09.29.
Reviewed-by: kvn, dholmes, never, phh
Contributed-by: Christos Zoulas <christos@zoulas.com>, Greg Lewis <glewis@eyesbeyond.com>, Kurt Miller <kurt@intricatesoftware.com>, Alexander Strange <astrange@apple.com>, Mike Swingler <swingler@apple.com>, Roger Hoover <rhoover@apple.com>, Victor Hernandez <vhernandez@apple.com>, Pratik Solanki <psolanki@apple.com>
| author | dcubed |
|---|---|
| date | Thu, 13 Oct 2011 09:35:42 -0700 |
| parents | c798c277ddd1 |
| children | da91efe96a93 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2225 | 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 "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 | |
| 73 instanceRefKlass::acquire_pending_list_lock(&_pending_list_basic_lock); | |
| 74 } | |
| 75 | |
| 76 | |
| 77 void VM_GC_Operation::release_and_notify_pending_list_lock() { | |
| 78 | |
| 79 instanceRefKlass::release_and_notify_pending_list_lock(&_pending_list_basic_lock); | |
| 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_GenCollectForPermanentAllocation::doit() { |
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196 SvcGCMarker sgcm(SvcGCMarker::FULL); |
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197 |
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198 SharedHeap* heap = (SharedHeap*)Universe::heap(); |
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199 GCCauseSetter gccs(heap, _gc_cause); |
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200 switch (heap->kind()) { |
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201 case (CollectedHeap::GenCollectedHeap): { |
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202 GenCollectedHeap* gch = (GenCollectedHeap*)heap; |
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203 gch->do_full_collection(gch->must_clear_all_soft_refs(), |
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204 gch->n_gens() - 1); |
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205 break; |
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206 } |
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207 #ifndef SERIALGC |
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208 case (CollectedHeap::G1CollectedHeap): { |
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209 G1CollectedHeap* g1h = (G1CollectedHeap*)heap; |
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210 g1h->do_full_collection(_gc_cause == GCCause::_last_ditch_collection); |
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211 break; |
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212 } |
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213 #endif // SERIALGC |
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214 default: |
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215 ShouldNotReachHere(); |
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216 } |
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217 _res = heap->perm_gen()->allocate(_size, false); |
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218 assert(heap->is_in_reserved_or_null(_res), "result not in heap"); |
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219 if (_res == NULL && GC_locker::is_active_and_needs_gc()) { |
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220 set_gc_locked(); |
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221 } |
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222 } |