Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/shared/vmGCOperations.hpp @ 22937:af8f16ac392c
8066771: Refactor VM GC operations caused by allocation failure
Reviewed-by: brutisso, jmasa
author | mlarsson |
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date | Thu, 09 Apr 2015 15:59:26 +0200 |
parents | fb69749583e8 |
children | a4ad5d51d29c |
rev | line source |
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0 | 1 /* |
22936 | 2 * Copyright (c) 2005, 2015, 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_GenCollectFull | |
42 // VM_GenCollectFullConcurrent | |
43 // VM_ParallelGCSystemGC | |
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44 // VM_CollectForAllocation |
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45 // VM_GenCollectForAllocation |
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46 // VM_ParallelGCFailedAllocation |
0 | 47 // VM_GC_Operation |
48 // - implements methods common to all classes in the hierarchy: | |
49 // prevents multiple gc requests and manages lock on heap; | |
50 // | |
51 // VM_GC_HeapInspection | |
52 // - prints class histogram on SIGBREAK if PrintClassHistogram | |
53 // is specified; and also the attach "inspectheap" operation | |
54 // | |
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55 // VM_CollectForAllocation |
0 | 56 // VM_GenCollectForAllocation |
57 // VM_ParallelGCFailedAllocation | |
58 // - this operation is invoked when allocation is failed; | |
59 // operation performs garbage collection and tries to | |
60 // allocate afterwards; | |
61 // | |
62 // VM_GenCollectFull | |
63 // VM_GenCollectFullConcurrent | |
64 // VM_ParallelGCSystemGC | |
65 // - these operations preform full collection of heaps of | |
66 // different kind | |
67 // | |
68 | |
69 class VM_GC_Operation: public VM_Operation { | |
70 protected: | |
22936 | 71 BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL) |
72 uint _gc_count_before; // gc count before acquiring PLL | |
73 uint _full_gc_count_before; // full gc count before acquiring PLL | |
74 bool _full; // whether a "full" collection | |
75 bool _prologue_succeeded; // whether doit_prologue succeeded | |
0 | 76 GCCause::Cause _gc_cause; // the putative cause for this gc op |
22936 | 77 bool _gc_locked; // will be set if gc was locked |
0 | 78 |
79 virtual bool skip_operation() const; | |
80 | |
81 // java.lang.ref.Reference support | |
82 void acquire_pending_list_lock(); | |
83 void release_and_notify_pending_list_lock(); | |
84 | |
85 public: | |
22936 | 86 VM_GC_Operation(uint gc_count_before, |
2225 | 87 GCCause::Cause _cause, |
22936 | 88 uint full_gc_count_before = 0, |
0 | 89 bool full = false) { |
90 _full = full; | |
91 _prologue_succeeded = false; | |
92 _gc_count_before = gc_count_before; | |
93 | |
94 // A subclass constructor will likely overwrite the following | |
2225 | 95 _gc_cause = _cause; |
0 | 96 |
97 _gc_locked = false; | |
98 | |
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99 _full_gc_count_before = full_gc_count_before; |
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100 // In ParallelScavengeHeap::mem_allocate() collections can be |
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101 // executed within a loop and _all_soft_refs_clear can be set |
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102 // true after they have been cleared by a collection and another |
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103 // collection started so that _all_soft_refs_clear can be true |
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104 // when this collection is started. Don't assert that |
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105 // _all_soft_refs_clear have to be false here even though |
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106 // mutators have run. Soft refs will be cleared again in this |
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107 // collection. |
0 | 108 } |
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109 ~VM_GC_Operation() { |
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110 CollectedHeap* ch = Universe::heap(); |
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111 ch->collector_policy()->set_all_soft_refs_clear(false); |
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112 } |
0 | 113 |
114 // Acquire the reference synchronization lock | |
115 virtual bool doit_prologue(); | |
116 // Do notifyAll (if needed) and release held lock | |
117 virtual void doit_epilogue(); | |
118 | |
119 virtual bool allow_nested_vm_operations() const { return true; } | |
120 bool prologue_succeeded() const { return _prologue_succeeded; } | |
121 | |
122 void set_gc_locked() { _gc_locked = true; } | |
123 bool gc_locked() const { return _gc_locked; } | |
124 | |
125 static void notify_gc_begin(bool full = false); | |
126 static void notify_gc_end(); | |
127 }; | |
128 | |
129 | |
130 class VM_GC_HeapInspection: public VM_GC_Operation { | |
131 private: | |
132 outputStream* _out; | |
133 bool _full_gc; | |
7956 | 134 bool _csv_format; // "comma separated values" format for spreadsheet. |
135 bool _print_help; | |
136 bool _print_class_stats; | |
137 const char* _columns; | |
0 | 138 public: |
10405 | 139 VM_GC_HeapInspection(outputStream* out, bool request_full_gc) : |
0 | 140 VM_GC_Operation(0 /* total collections, dummy, ignored */, |
2225 | 141 GCCause::_heap_inspection /* GC Cause */, |
0 | 142 0 /* total full collections, dummy, ignored */, |
143 request_full_gc) { | |
144 _out = out; | |
145 _full_gc = request_full_gc; | |
7956 | 146 _csv_format = false; |
147 _print_help = false; | |
148 _print_class_stats = false; | |
149 _columns = NULL; | |
0 | 150 } |
151 | |
152 ~VM_GC_HeapInspection() {} | |
153 virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; } | |
154 virtual bool skip_operation() const; | |
155 virtual bool doit_prologue(); | |
156 virtual void doit(); | |
7956 | 157 void set_csv_format(bool value) {_csv_format = value;} |
158 void set_print_help(bool value) {_print_help = value;} | |
159 void set_print_class_stats(bool value) {_print_class_stats = value;} | |
160 void set_columns(const char* value) {_columns = value;} | |
10405 | 161 protected: |
162 bool collect(); | |
0 | 163 }; |
164 | |
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165 class VM_CollectForAllocation : public VM_GC_Operation { |
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166 protected: |
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167 size_t _word_size; // Size of object to be allocated (in number of words) |
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168 HeapWord* _result; // Allocation result (NULL if allocation failed) |
0 | 169 |
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170 public: |
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171 VM_CollectForAllocation(size_t word_size, uint gc_count_before, GCCause::Cause cause) |
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172 : VM_GC_Operation(gc_count_before, cause), _result(NULL), _word_size(word_size) {} |
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173 |
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174 HeapWord* result() const { |
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175 return _result; |
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176 } |
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177 }; |
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178 |
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179 class VM_GenCollectForAllocation : public VM_CollectForAllocation { |
0 | 180 private: |
181 bool _tlab; // alloc is of a tlab. | |
182 public: | |
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183 VM_GenCollectForAllocation(size_t word_size, |
0 | 184 bool tlab, |
22936 | 185 uint gc_count_before) |
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186 : VM_CollectForAllocation(word_size, gc_count_before, GCCause::_allocation_failure), |
0 | 187 _tlab(tlab) { |
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188 assert(word_size != 0, "An allocation should always be requested with this operation."); |
0 | 189 } |
190 ~VM_GenCollectForAllocation() {} | |
191 virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; } | |
192 virtual void doit(); | |
193 }; | |
194 | |
195 // VM operation to invoke a collection of the heap as a | |
196 // GenCollectedHeap heap. | |
197 class VM_GenCollectFull: public VM_GC_Operation { | |
198 private: | |
199 int _max_level; | |
200 public: | |
22936 | 201 VM_GenCollectFull(uint gc_count_before, |
202 uint full_gc_count_before, | |
0 | 203 GCCause::Cause gc_cause, |
22936 | 204 int max_level) |
2225 | 205 : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */), |
206 _max_level(max_level) { } | |
0 | 207 ~VM_GenCollectFull() {} |
208 virtual VMOp_Type type() const { return VMOp_GenCollectFull; } | |
209 virtual void doit(); | |
210 }; | |
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211 |
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212 class VM_CollectForMetadataAllocation: public VM_GC_Operation { |
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213 private: |
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214 MetaWord* _result; |
6885 | 215 size_t _size; // size of object to be allocated |
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216 Metaspace::MetadataType _mdtype; |
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217 ClassLoaderData* _loader_data; |
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218 public: |
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219 VM_CollectForMetadataAllocation(ClassLoaderData* loader_data, |
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220 size_t size, Metaspace::MetadataType mdtype, |
22936 | 221 uint gc_count_before, |
222 uint full_gc_count_before, | |
223 GCCause::Cause gc_cause) | |
2225 | 224 : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true), |
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225 _loader_data(loader_data), _size(size), _mdtype(mdtype), _result(NULL) { |
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226 } |
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227 virtual VMOp_Type type() const { return VMOp_CollectForMetadataAllocation; } |
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228 virtual void doit(); |
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229 MetaWord* result() const { return _result; } |
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230 |
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231 bool initiate_concurrent_GC(); |
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232 }; |
1972 | 233 |
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234 class SvcGCMarker : public StackObj { |
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235 private: |
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236 JvmtiGCMarker _jgcm; |
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237 public: |
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238 typedef enum { MINOR, FULL, OTHER } reason_type; |
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239 |
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240 SvcGCMarker(reason_type reason ) { |
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241 VM_GC_Operation::notify_gc_begin(reason == FULL); |
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242 } |
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243 |
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244 ~SvcGCMarker() { |
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245 VM_GC_Operation::notify_gc_end(); |
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246 } |
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247 }; |
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248 |
1972 | 249 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP |