Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/shared/vmGCOperations.cpp @ 3687:7958ebb561b0
Merge
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 18 Nov 2011 17:20:38 +0100 |
parents | c798c277ddd1 |
children | 436b4a3231bf |
rev | line source |
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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 |
0 | 43 HS_DTRACE_PROBE_DECL1(hotspot, gc__begin, bool); |
44 HS_DTRACE_PROBE_DECL(hotspot, gc__end); | |
45 | |
46 // The same dtrace probe can't be inserted in two different files, so we | |
47 // have to call it here, so it's only in one file. Can't create new probes | |
48 // for the other file anymore. The dtrace probes have to remain stable. | |
49 void VM_GC_Operation::notify_gc_begin(bool full) { | |
50 HS_DTRACE_PROBE1(hotspot, gc__begin, full); | |
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51 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); |
0 | 52 } |
53 | |
54 void VM_GC_Operation::notify_gc_end() { | |
55 HS_DTRACE_PROBE(hotspot, gc__end); | |
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56 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); |
0 | 57 } |
58 | |
59 void VM_GC_Operation::acquire_pending_list_lock() { | |
60 // we may enter this with pending exception set | |
61 instanceRefKlass::acquire_pending_list_lock(&_pending_list_basic_lock); | |
62 } | |
63 | |
64 | |
65 void VM_GC_Operation::release_and_notify_pending_list_lock() { | |
66 | |
67 instanceRefKlass::release_and_notify_pending_list_lock(&_pending_list_basic_lock); | |
68 } | |
69 | |
70 // Allocations may fail in several threads at about the same time, | |
71 // resulting in multiple gc requests. We only want to do one of them. | |
72 // In case a GC locker is active and the need for a GC is already signalled, | |
73 // we want to skip this GC attempt altogether, without doing a futile | |
74 // safepoint operation. | |
75 bool VM_GC_Operation::skip_operation() const { | |
76 bool skip = (_gc_count_before != Universe::heap()->total_collections()); | |
77 if (_full && skip) { | |
78 skip = (_full_gc_count_before != Universe::heap()->total_full_collections()); | |
79 } | |
80 if (!skip && GC_locker::is_active_and_needs_gc()) { | |
81 skip = Universe::heap()->is_maximal_no_gc(); | |
82 assert(!(skip && (_gc_cause == GCCause::_gc_locker)), | |
83 "GC_locker cannot be active when initiating GC"); | |
84 } | |
85 return skip; | |
86 } | |
87 | |
88 bool VM_GC_Operation::doit_prologue() { | |
89 assert(Thread::current()->is_Java_thread(), "just checking"); | |
2225 | 90 assert(((_gc_cause != GCCause::_no_gc) && |
91 (_gc_cause != GCCause::_no_cause_specified)), "Illegal GCCause"); | |
0 | 92 |
93 acquire_pending_list_lock(); | |
94 // If the GC count has changed someone beat us to the collection | |
95 // Get the Heap_lock after the pending_list_lock. | |
96 Heap_lock->lock(); | |
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97 |
0 | 98 // Check invocations |
99 if (skip_operation()) { | |
100 // skip collection | |
101 Heap_lock->unlock(); | |
102 release_and_notify_pending_list_lock(); | |
103 _prologue_succeeded = false; | |
104 } else { | |
105 _prologue_succeeded = true; | |
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106 SharedHeap* sh = SharedHeap::heap(); |
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107 if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = true; |
0 | 108 } |
109 return _prologue_succeeded; | |
110 } | |
111 | |
112 | |
113 void VM_GC_Operation::doit_epilogue() { | |
114 assert(Thread::current()->is_Java_thread(), "just checking"); | |
115 // Release the Heap_lock first. | |
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116 SharedHeap* sh = SharedHeap::heap(); |
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117 if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = false; |
0 | 118 Heap_lock->unlock(); |
119 release_and_notify_pending_list_lock(); | |
120 } | |
121 | |
122 bool VM_GC_HeapInspection::doit_prologue() { | |
123 if (Universe::heap()->supports_heap_inspection()) { | |
124 return VM_GC_Operation::doit_prologue(); | |
125 } else { | |
126 return false; | |
127 } | |
128 } | |
129 | |
130 bool VM_GC_HeapInspection::skip_operation() const { | |
131 assert(Universe::heap()->supports_heap_inspection(), "huh?"); | |
132 return false; | |
133 } | |
134 | |
135 void VM_GC_HeapInspection::doit() { | |
136 HandleMark hm; | |
137 CollectedHeap* ch = Universe::heap(); | |
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138 ch->ensure_parsability(false); // must happen, even if collection does |
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139 // not happen (e.g. due to GC_locker) |
0 | 140 if (_full_gc) { |
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141 // The collection attempt below would be skipped anyway if |
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142 // the gc locker is held. The following dump may then be a tad |
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143 // misleading to someone expecting only live objects to show |
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144 // up in the dump (see CR 6944195). Just issue a suitable warning |
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145 // in that case and do not attempt to do a collection. |
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146 // The latter is a subtle point, because even a failed attempt |
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147 // to GC will, in fact, induce one in the future, which we |
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148 // probably want to avoid in this case because the GC that we may |
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149 // be about to attempt holds value for us only |
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150 // if it happens now and not if it happens in the eventual |
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151 // future. |
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152 if (GC_locker::is_active()) { |
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153 warning("GC locker is held; pre-dump GC was skipped"); |
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154 } else { |
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155 ch->collect_as_vm_thread(GCCause::_heap_inspection); |
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156 } |
0 | 157 } |
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158 HeapInspection::heap_inspection(_out, _need_prologue /* need_prologue */); |
0 | 159 } |
160 | |
161 | |
162 void VM_GenCollectForAllocation::doit() { | |
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163 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
0 | 164 |
165 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
166 GCCauseSetter gccs(gch, _gc_cause); | |
167 _res = gch->satisfy_failed_allocation(_size, _tlab); | |
168 assert(gch->is_in_reserved_or_null(_res), "result not in heap"); | |
169 | |
170 if (_res == NULL && GC_locker::is_active_and_needs_gc()) { | |
171 set_gc_locked(); | |
172 } | |
173 } | |
174 | |
175 void VM_GenCollectFull::doit() { | |
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176 SvcGCMarker sgcm(SvcGCMarker::FULL); |
0 | 177 |
178 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
179 GCCauseSetter gccs(gch, _gc_cause); | |
180 gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_level); | |
181 } | |
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182 |
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183 void VM_GenCollectForPermanentAllocation::doit() { |
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184 SvcGCMarker sgcm(SvcGCMarker::FULL); |
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185 |
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186 SharedHeap* heap = (SharedHeap*)Universe::heap(); |
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187 GCCauseSetter gccs(heap, _gc_cause); |
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188 switch (heap->kind()) { |
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189 case (CollectedHeap::GenCollectedHeap): { |
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190 GenCollectedHeap* gch = (GenCollectedHeap*)heap; |
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191 gch->do_full_collection(gch->must_clear_all_soft_refs(), |
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192 gch->n_gens() - 1); |
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193 break; |
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194 } |
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195 #ifndef SERIALGC |
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196 case (CollectedHeap::G1CollectedHeap): { |
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197 G1CollectedHeap* g1h = (G1CollectedHeap*)heap; |
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198 g1h->do_full_collection(_gc_cause == GCCause::_last_ditch_collection); |
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199 break; |
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200 } |
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201 #endif // SERIALGC |
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202 default: |
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203 ShouldNotReachHere(); |
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204 } |
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205 _res = heap->perm_gen()->allocate(_size, false); |
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206 assert(heap->is_in_reserved_or_null(_res), "result not in heap"); |
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207 if (_res == NULL && GC_locker::is_active_and_needs_gc()) { |
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208 set_gc_locked(); |
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209 } |
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210 } |