Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/shared/vmGCOperations.cpp @ 2186:e49cfa28f585
6999988: CMS: Increased fragmentation leading to promotion failure after CR#6631166 got implemented
Summary: Fix calculation of _desired, in free list statistics, which was missing an intended set of parentheses.
Reviewed-by: poonam, jmasa
author | ysr |
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date | Tue, 01 Feb 2011 10:02:01 -0800 |
parents | 7246a374a9f2 |
children | c798c277ddd1 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2005, 2010, 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"); | |
90 | |
91 acquire_pending_list_lock(); | |
92 // If the GC count has changed someone beat us to the collection | |
93 // Get the Heap_lock after the pending_list_lock. | |
94 Heap_lock->lock(); | |
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95 |
0 | 96 // Check invocations |
97 if (skip_operation()) { | |
98 // skip collection | |
99 Heap_lock->unlock(); | |
100 release_and_notify_pending_list_lock(); | |
101 _prologue_succeeded = false; | |
102 } else { | |
103 _prologue_succeeded = true; | |
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104 SharedHeap* sh = SharedHeap::heap(); |
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105 if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = true; |
0 | 106 } |
107 return _prologue_succeeded; | |
108 } | |
109 | |
110 | |
111 void VM_GC_Operation::doit_epilogue() { | |
112 assert(Thread::current()->is_Java_thread(), "just checking"); | |
113 // Release the Heap_lock first. | |
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114 SharedHeap* sh = SharedHeap::heap(); |
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115 if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = false; |
0 | 116 Heap_lock->unlock(); |
117 release_and_notify_pending_list_lock(); | |
118 } | |
119 | |
120 bool VM_GC_HeapInspection::doit_prologue() { | |
121 if (Universe::heap()->supports_heap_inspection()) { | |
122 return VM_GC_Operation::doit_prologue(); | |
123 } else { | |
124 return false; | |
125 } | |
126 } | |
127 | |
128 bool VM_GC_HeapInspection::skip_operation() const { | |
129 assert(Universe::heap()->supports_heap_inspection(), "huh?"); | |
130 return false; | |
131 } | |
132 | |
133 void VM_GC_HeapInspection::doit() { | |
134 HandleMark hm; | |
135 CollectedHeap* ch = Universe::heap(); | |
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136 ch->ensure_parsability(false); // must happen, even if collection does |
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137 // not happen (e.g. due to GC_locker) |
0 | 138 if (_full_gc) { |
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139 // The collection attempt below would be skipped anyway if |
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140 // the gc locker is held. The following dump may then be a tad |
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141 // misleading to someone expecting only live objects to show |
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142 // up in the dump (see CR 6944195). Just issue a suitable warning |
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143 // in that case and do not attempt to do a collection. |
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144 // The latter is a subtle point, because even a failed attempt |
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145 // to GC will, in fact, induce one in the future, which we |
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146 // probably want to avoid in this case because the GC that we may |
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147 // be about to attempt holds value for us only |
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148 // if it happens now and not if it happens in the eventual |
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149 // future. |
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150 if (GC_locker::is_active()) { |
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151 warning("GC locker is held; pre-dump GC was skipped"); |
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152 } else { |
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153 ch->collect_as_vm_thread(GCCause::_heap_inspection); |
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154 } |
0 | 155 } |
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156 HeapInspection::heap_inspection(_out, _need_prologue /* need_prologue */); |
0 | 157 } |
158 | |
159 | |
160 void VM_GenCollectForAllocation::doit() { | |
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161 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
0 | 162 |
163 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
164 GCCauseSetter gccs(gch, _gc_cause); | |
165 _res = gch->satisfy_failed_allocation(_size, _tlab); | |
166 assert(gch->is_in_reserved_or_null(_res), "result not in heap"); | |
167 | |
168 if (_res == NULL && GC_locker::is_active_and_needs_gc()) { | |
169 set_gc_locked(); | |
170 } | |
171 } | |
172 | |
173 void VM_GenCollectFull::doit() { | |
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174 SvcGCMarker sgcm(SvcGCMarker::FULL); |
0 | 175 |
176 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
177 GCCauseSetter gccs(gch, _gc_cause); | |
178 gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_level); | |
179 } | |
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180 |
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181 void VM_GenCollectForPermanentAllocation::doit() { |
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182 SvcGCMarker sgcm(SvcGCMarker::FULL); |
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183 |
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184 SharedHeap* heap = (SharedHeap*)Universe::heap(); |
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185 GCCauseSetter gccs(heap, _gc_cause); |
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186 switch (heap->kind()) { |
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187 case (CollectedHeap::GenCollectedHeap): { |
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188 GenCollectedHeap* gch = (GenCollectedHeap*)heap; |
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189 gch->do_full_collection(gch->must_clear_all_soft_refs(), |
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190 gch->n_gens() - 1); |
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191 break; |
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192 } |
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193 #ifndef SERIALGC |
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194 case (CollectedHeap::G1CollectedHeap): { |
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195 G1CollectedHeap* g1h = (G1CollectedHeap*)heap; |
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196 g1h->do_full_collection(_gc_cause == GCCause::_last_ditch_collection); |
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197 break; |
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198 } |
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199 #endif // SERIALGC |
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200 default: |
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201 ShouldNotReachHere(); |
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202 } |
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203 _res = heap->perm_gen()->allocate(_size, false); |
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204 assert(heap->is_in_reserved_or_null(_res), "result not in heap"); |
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205 if (_res == NULL && GC_locker::is_active_and_needs_gc()) { |
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206 set_gc_locked(); |
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207 } |
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208 } |