Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/shared/vmGCOperations.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | c798c277ddd1 |
| children | 685df3c6f84b |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2005, 2012, 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP | |
| 27 | |
| 28 #include "memory/heapInspection.hpp" | |
| 29 #include "runtime/handles.hpp" | |
| 30 #include "runtime/jniHandles.hpp" | |
| 31 #include "runtime/synchronizer.hpp" | |
| 32 #include "runtime/vm_operations.hpp" | |
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33 #include "prims/jvmtiExport.hpp" |
| 1972 | 34 |
| 0 | 35 // The following class hierarchy represents |
| 36 // a set of operations (VM_Operation) related to GC. | |
| 37 // | |
| 38 // VM_Operation | |
| 39 // VM_GC_Operation | |
| 40 // VM_GC_HeapInspection | |
| 41 // VM_GenCollectForAllocation | |
| 42 // VM_GenCollectFull | |
| 43 // VM_GenCollectFullConcurrent | |
| 44 // VM_ParallelGCFailedAllocation | |
| 45 // VM_ParallelGCSystemGC | |
| 46 // VM_GC_Operation | |
| 47 // - implements methods common to all classes in the hierarchy: | |
| 48 // prevents multiple gc requests and manages lock on heap; | |
| 49 // | |
| 50 // VM_GC_HeapInspection | |
| 51 // - prints class histogram on SIGBREAK if PrintClassHistogram | |
| 52 // is specified; and also the attach "inspectheap" operation | |
| 53 // | |
| 54 // VM_GenCollectForAllocation | |
| 55 // VM_ParallelGCFailedAllocation | |
| 56 // - this operation is invoked when allocation is failed; | |
| 57 // operation performs garbage collection and tries to | |
| 58 // allocate afterwards; | |
| 59 // | |
| 60 // VM_GenCollectFull | |
| 61 // VM_GenCollectFullConcurrent | |
| 62 // VM_ParallelGCSystemGC | |
| 63 // - these operations preform full collection of heaps of | |
| 64 // different kind | |
| 65 // | |
| 66 | |
| 67 class VM_GC_Operation: public VM_Operation { | |
| 68 protected: | |
| 69 BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL) | |
| 70 unsigned int _gc_count_before; // gc count before acquiring PLL | |
| 71 unsigned int _full_gc_count_before; // full gc count before acquiring PLL | |
| 72 bool _full; // whether a "full" collection | |
| 73 bool _prologue_succeeded; // whether doit_prologue succeeded | |
| 74 GCCause::Cause _gc_cause; // the putative cause for this gc op | |
| 75 bool _gc_locked; // will be set if gc was locked | |
| 76 | |
| 77 virtual bool skip_operation() const; | |
| 78 | |
| 79 // java.lang.ref.Reference support | |
| 80 void acquire_pending_list_lock(); | |
| 81 void release_and_notify_pending_list_lock(); | |
| 82 | |
| 83 public: | |
| 84 VM_GC_Operation(unsigned int gc_count_before, | |
| 2225 | 85 GCCause::Cause _cause, |
| 0 | 86 unsigned int full_gc_count_before = 0, |
| 87 bool full = false) { | |
| 88 _full = full; | |
| 89 _prologue_succeeded = false; | |
| 90 _gc_count_before = gc_count_before; | |
| 91 | |
| 92 // A subclass constructor will likely overwrite the following | |
| 2225 | 93 _gc_cause = _cause; |
| 0 | 94 |
| 95 _gc_locked = false; | |
| 96 | |
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97 _full_gc_count_before = full_gc_count_before; |
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98 // In ParallelScavengeHeap::mem_allocate() collections can be |
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99 // executed within a loop and _all_soft_refs_clear can be set |
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100 // true after they have been cleared by a collection and another |
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101 // collection started so that _all_soft_refs_clear can be true |
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102 // when this collection is started. Don't assert that |
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103 // _all_soft_refs_clear have to be false here even though |
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104 // mutators have run. Soft refs will be cleared again in this |
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105 // collection. |
| 0 | 106 } |
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107 ~VM_GC_Operation() { |
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108 CollectedHeap* ch = Universe::heap(); |
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109 ch->collector_policy()->set_all_soft_refs_clear(false); |
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110 } |
| 0 | 111 |
| 112 // Acquire the reference synchronization lock | |
| 113 virtual bool doit_prologue(); | |
| 114 // Do notifyAll (if needed) and release held lock | |
| 115 virtual void doit_epilogue(); | |
| 116 | |
| 117 virtual bool allow_nested_vm_operations() const { return true; } | |
| 118 bool prologue_succeeded() const { return _prologue_succeeded; } | |
| 119 | |
| 120 void set_gc_locked() { _gc_locked = true; } | |
| 121 bool gc_locked() const { return _gc_locked; } | |
| 122 | |
| 123 static void notify_gc_begin(bool full = false); | |
| 124 static void notify_gc_end(); | |
| 125 }; | |
| 126 | |
| 127 | |
| 128 class VM_GC_HeapInspection: public VM_GC_Operation { | |
| 129 private: | |
| 130 outputStream* _out; | |
| 131 bool _full_gc; | |
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132 bool _need_prologue; |
| 0 | 133 public: |
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134 VM_GC_HeapInspection(outputStream* out, bool request_full_gc, |
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135 bool need_prologue) : |
| 0 | 136 VM_GC_Operation(0 /* total collections, dummy, ignored */, |
| 2225 | 137 GCCause::_heap_inspection /* GC Cause */, |
| 0 | 138 0 /* total full collections, dummy, ignored */, |
| 139 request_full_gc) { | |
| 140 _out = out; | |
| 141 _full_gc = request_full_gc; | |
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142 _need_prologue = need_prologue; |
| 0 | 143 } |
| 144 | |
| 145 ~VM_GC_HeapInspection() {} | |
| 146 virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; } | |
| 147 virtual bool skip_operation() const; | |
| 148 virtual bool doit_prologue(); | |
| 149 virtual void doit(); | |
| 150 }; | |
| 151 | |
| 152 | |
| 153 class VM_GenCollectForAllocation: public VM_GC_Operation { | |
| 154 private: | |
| 155 HeapWord* _res; | |
| 156 size_t _size; // size of object to be allocated. | |
| 157 bool _tlab; // alloc is of a tlab. | |
| 158 public: | |
| 159 VM_GenCollectForAllocation(size_t size, | |
| 160 bool tlab, | |
| 161 unsigned int gc_count_before) | |
| 2225 | 162 : VM_GC_Operation(gc_count_before, GCCause::_allocation_failure), |
| 0 | 163 _size(size), |
| 164 _tlab(tlab) { | |
| 165 _res = NULL; | |
| 166 } | |
| 167 ~VM_GenCollectForAllocation() {} | |
| 168 virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; } | |
| 169 virtual void doit(); | |
| 170 HeapWord* result() const { return _res; } | |
| 171 }; | |
| 172 | |
| 173 | |
| 174 // VM operation to invoke a collection of the heap as a | |
| 175 // GenCollectedHeap heap. | |
| 176 class VM_GenCollectFull: public VM_GC_Operation { | |
| 177 private: | |
| 178 int _max_level; | |
| 179 public: | |
| 180 VM_GenCollectFull(unsigned int gc_count_before, | |
| 181 unsigned int full_gc_count_before, | |
| 182 GCCause::Cause gc_cause, | |
| 183 int max_level) | |
| 2225 | 184 : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */), |
| 185 _max_level(max_level) { } | |
| 0 | 186 ~VM_GenCollectFull() {} |
| 187 virtual VMOp_Type type() const { return VMOp_GenCollectFull; } | |
| 188 virtual void doit(); | |
| 189 }; | |
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190 |
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191 class VM_CollectForMetadataAllocation: public VM_GC_Operation { |
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192 private: |
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193 MetaWord* _result; |
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194 size_t _size; // size of object to be allocated |
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195 Metaspace::MetadataType _mdtype; |
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196 ClassLoaderData* _loader_data; |
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197 public: |
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198 VM_CollectForMetadataAllocation(ClassLoaderData* loader_data, |
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199 size_t size, Metaspace::MetadataType mdtype, |
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200 unsigned int gc_count_before, |
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201 unsigned int full_gc_count_before, |
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202 GCCause::Cause gc_cause) |
| 2225 | 203 : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true), |
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204 _loader_data(loader_data), _size(size), _mdtype(mdtype), _result(NULL) { |
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205 } |
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206 ~VM_CollectForMetadataAllocation() { |
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207 MetaspaceGC::set_expand_after_GC(false); |
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208 } |
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209 virtual VMOp_Type type() const { return VMOp_CollectForMetadataAllocation; } |
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210 virtual void doit(); |
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211 MetaWord* result() const { return _result; } |
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212 }; |
| 1972 | 213 |
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214 class SvcGCMarker : public StackObj { |
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215 private: |
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216 JvmtiGCMarker _jgcm; |
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217 public: |
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218 typedef enum { MINOR, FULL, OTHER } reason_type; |
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219 |
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220 SvcGCMarker(reason_type reason ) { |
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221 VM_GC_Operation::notify_gc_begin(reason == FULL); |
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222 } |
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223 |
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224 ~SvcGCMarker() { |
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225 VM_GC_Operation::notify_gc_end(); |
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226 } |
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227 }; |
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228 |
| 1972 | 229 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP |