Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/shared/vmGCOperations.cpp @ 1547:fb1a39993f69
6951319: enable solaris builds using Sun Studio 12 update 1
Reviewed-by: kamg, ysr, dholmes, johnc
| author | jcoomes |
|---|---|
| date | Tue, 18 May 2010 11:02:18 -0700 |
| parents | bdb5361c461c |
| children | c18cbe5936b8 |
| rev | line source |
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| 0 | 1 /* |
| 196 | 2 * Copyright 2005-2008 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 # include "incls/_precompiled.incl" | |
| 25 # include "incls/_vmGCOperations.cpp.incl" | |
| 26 | |
| 27 HS_DTRACE_PROBE_DECL1(hotspot, gc__begin, bool); | |
| 28 HS_DTRACE_PROBE_DECL(hotspot, gc__end); | |
| 29 | |
| 30 // The same dtrace probe can't be inserted in two different files, so we | |
| 31 // have to call it here, so it's only in one file. Can't create new probes | |
| 32 // for the other file anymore. The dtrace probes have to remain stable. | |
| 33 void VM_GC_Operation::notify_gc_begin(bool full) { | |
| 34 HS_DTRACE_PROBE1(hotspot, gc__begin, full); | |
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35 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); |
| 0 | 36 } |
| 37 | |
| 38 void VM_GC_Operation::notify_gc_end() { | |
| 39 HS_DTRACE_PROBE(hotspot, gc__end); | |
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40 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); |
| 0 | 41 } |
| 42 | |
| 43 void VM_GC_Operation::acquire_pending_list_lock() { | |
| 44 // we may enter this with pending exception set | |
| 45 instanceRefKlass::acquire_pending_list_lock(&_pending_list_basic_lock); | |
| 46 } | |
| 47 | |
| 48 | |
| 49 void VM_GC_Operation::release_and_notify_pending_list_lock() { | |
| 50 | |
| 51 instanceRefKlass::release_and_notify_pending_list_lock(&_pending_list_basic_lock); | |
| 52 } | |
| 53 | |
| 54 // Allocations may fail in several threads at about the same time, | |
| 55 // resulting in multiple gc requests. We only want to do one of them. | |
| 56 // In case a GC locker is active and the need for a GC is already signalled, | |
| 57 // we want to skip this GC attempt altogether, without doing a futile | |
| 58 // safepoint operation. | |
| 59 bool VM_GC_Operation::skip_operation() const { | |
| 60 bool skip = (_gc_count_before != Universe::heap()->total_collections()); | |
| 61 if (_full && skip) { | |
| 62 skip = (_full_gc_count_before != Universe::heap()->total_full_collections()); | |
| 63 } | |
| 64 if (!skip && GC_locker::is_active_and_needs_gc()) { | |
| 65 skip = Universe::heap()->is_maximal_no_gc(); | |
| 66 assert(!(skip && (_gc_cause == GCCause::_gc_locker)), | |
| 67 "GC_locker cannot be active when initiating GC"); | |
| 68 } | |
| 69 return skip; | |
| 70 } | |
| 71 | |
| 72 bool VM_GC_Operation::doit_prologue() { | |
| 73 assert(Thread::current()->is_Java_thread(), "just checking"); | |
| 74 | |
| 75 acquire_pending_list_lock(); | |
| 76 // If the GC count has changed someone beat us to the collection | |
| 77 // Get the Heap_lock after the pending_list_lock. | |
| 78 Heap_lock->lock(); | |
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79 |
| 0 | 80 // Check invocations |
| 81 if (skip_operation()) { | |
| 82 // skip collection | |
| 83 Heap_lock->unlock(); | |
| 84 release_and_notify_pending_list_lock(); | |
| 85 _prologue_succeeded = false; | |
| 86 } else { | |
| 87 _prologue_succeeded = true; | |
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88 SharedHeap* sh = SharedHeap::heap(); |
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89 if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = true; |
| 0 | 90 } |
| 91 return _prologue_succeeded; | |
| 92 } | |
| 93 | |
| 94 | |
| 95 void VM_GC_Operation::doit_epilogue() { | |
| 96 assert(Thread::current()->is_Java_thread(), "just checking"); | |
| 97 // Release the Heap_lock first. | |
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98 SharedHeap* sh = SharedHeap::heap(); |
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99 if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = false; |
| 0 | 100 Heap_lock->unlock(); |
| 101 release_and_notify_pending_list_lock(); | |
| 102 } | |
| 103 | |
| 104 bool VM_GC_HeapInspection::doit_prologue() { | |
| 105 if (Universe::heap()->supports_heap_inspection()) { | |
| 106 return VM_GC_Operation::doit_prologue(); | |
| 107 } else { | |
| 108 return false; | |
| 109 } | |
| 110 } | |
| 111 | |
| 112 bool VM_GC_HeapInspection::skip_operation() const { | |
| 113 assert(Universe::heap()->supports_heap_inspection(), "huh?"); | |
| 114 return false; | |
| 115 } | |
| 116 | |
| 117 void VM_GC_HeapInspection::doit() { | |
| 118 HandleMark hm; | |
| 119 CollectedHeap* ch = Universe::heap(); | |
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120 ch->ensure_parsability(false); // must happen, even if collection does |
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121 // not happen (e.g. due to GC_locker) |
| 0 | 122 if (_full_gc) { |
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123 // The collection attempt below would be skipped anyway if |
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124 // the gc locker is held. The following dump may then be a tad |
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125 // misleading to someone expecting only live objects to show |
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126 // up in the dump (see CR 6944195). Just issue a suitable warning |
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127 // in that case and do not attempt to do a collection. |
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128 // The latter is a subtle point, because even a failed attempt |
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129 // to GC will, in fact, induce one in the future, which we |
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130 // probably want to avoid in this case because the GC that we may |
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131 // be about to attempt holds value for us only |
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132 // if it happens now and not if it happens in the eventual |
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133 // future. |
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134 if (GC_locker::is_active()) { |
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135 warning("GC locker is held; pre-dump GC was skipped"); |
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136 } else { |
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137 ch->collect_as_vm_thread(GCCause::_heap_inspection); |
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138 } |
| 0 | 139 } |
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140 HeapInspection::heap_inspection(_out, _need_prologue /* need_prologue */); |
| 0 | 141 } |
| 142 | |
| 143 | |
| 144 void VM_GenCollectForAllocation::doit() { | |
| 145 JvmtiGCForAllocationMarker jgcm; | |
| 146 notify_gc_begin(false); | |
| 147 | |
| 148 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 149 GCCauseSetter gccs(gch, _gc_cause); | |
| 150 _res = gch->satisfy_failed_allocation(_size, _tlab); | |
| 151 assert(gch->is_in_reserved_or_null(_res), "result not in heap"); | |
| 152 | |
| 153 if (_res == NULL && GC_locker::is_active_and_needs_gc()) { | |
| 154 set_gc_locked(); | |
| 155 } | |
| 156 notify_gc_end(); | |
| 157 } | |
| 158 | |
| 159 void VM_GenCollectFull::doit() { | |
| 160 JvmtiGCFullMarker jgcm; | |
| 161 notify_gc_begin(true); | |
| 162 | |
| 163 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 164 GCCauseSetter gccs(gch, _gc_cause); | |
| 165 gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_level); | |
| 166 notify_gc_end(); | |
| 167 } | |
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168 |
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169 void VM_GenCollectForPermanentAllocation::doit() { |
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170 JvmtiGCForAllocationMarker jgcm; |
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171 notify_gc_begin(true); |
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172 SharedHeap* heap = (SharedHeap*)Universe::heap(); |
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173 GCCauseSetter gccs(heap, _gc_cause); |
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174 switch (heap->kind()) { |
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175 case (CollectedHeap::GenCollectedHeap): { |
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176 GenCollectedHeap* gch = (GenCollectedHeap*)heap; |
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177 gch->do_full_collection(gch->must_clear_all_soft_refs(), |
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178 gch->n_gens() - 1); |
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179 break; |
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180 } |
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181 #ifndef SERIALGC |
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182 case (CollectedHeap::G1CollectedHeap): { |
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183 G1CollectedHeap* g1h = (G1CollectedHeap*)heap; |
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184 g1h->do_full_collection(_gc_cause == GCCause::_last_ditch_collection); |
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185 break; |
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186 } |
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187 #endif // SERIALGC |
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188 default: |
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189 ShouldNotReachHere(); |
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190 } |
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191 _res = heap->perm_gen()->allocate(_size, false); |
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192 assert(heap->is_in_reserved_or_null(_res), "result not in heap"); |
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193 if (_res == NULL && GC_locker::is_active_and_needs_gc()) { |
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194 set_gc_locked(); |
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195 } |
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196 notify_gc_end(); |
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197 } |