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annotate src/share/vm/gc_implementation/shared/vmGCOperations.hpp @ 3687:7958ebb561b0
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author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 18 Nov 2011 17:20:38 +0100 |
parents | c798c277ddd1 |
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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 #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_ParallelGCFailedPermanentAllocation | |
46 // VM_ParallelGCSystemGC | |
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 // | |
55 // VM_GenCollectForAllocation | |
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56 // VM_GenCollectForPermanentAllocation |
0 | 57 // VM_ParallelGCFailedAllocation |
58 // VM_ParallelGCFailedPermanentAllocation | |
59 // - this operation is invoked when allocation is failed; | |
60 // operation performs garbage collection and tries to | |
61 // allocate afterwards; | |
62 // | |
63 // VM_GenCollectFull | |
64 // VM_GenCollectFullConcurrent | |
65 // VM_ParallelGCSystemGC | |
66 // - these operations preform full collection of heaps of | |
67 // different kind | |
68 // | |
69 | |
70 class VM_GC_Operation: public VM_Operation { | |
71 protected: | |
72 BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL) | |
73 unsigned int _gc_count_before; // gc count before acquiring PLL | |
74 unsigned int _full_gc_count_before; // full gc count before acquiring PLL | |
75 bool _full; // whether a "full" collection | |
76 bool _prologue_succeeded; // whether doit_prologue succeeded | |
77 GCCause::Cause _gc_cause; // the putative cause for this gc op | |
78 bool _gc_locked; // will be set if gc was locked | |
79 | |
80 virtual bool skip_operation() const; | |
81 | |
82 // java.lang.ref.Reference support | |
83 void acquire_pending_list_lock(); | |
84 void release_and_notify_pending_list_lock(); | |
85 | |
86 public: | |
87 VM_GC_Operation(unsigned int gc_count_before, | |
2225 | 88 GCCause::Cause _cause, |
0 | 89 unsigned int full_gc_count_before = 0, |
90 bool full = false) { | |
91 _full = full; | |
92 _prologue_succeeded = false; | |
93 _gc_count_before = gc_count_before; | |
94 | |
95 // A subclass constructor will likely overwrite the following | |
2225 | 96 _gc_cause = _cause; |
0 | 97 |
98 _gc_locked = false; | |
99 | |
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100 _full_gc_count_before = full_gc_count_before; |
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101 // In ParallelScavengeHeap::mem_allocate() collections can be |
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102 // executed within a loop and _all_soft_refs_clear can be set |
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103 // true after they have been cleared by a collection and another |
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104 // collection started so that _all_soft_refs_clear can be true |
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105 // when this collection is started. Don't assert that |
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106 // _all_soft_refs_clear have to be false here even though |
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107 // mutators have run. Soft refs will be cleared again in this |
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108 // collection. |
0 | 109 } |
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110 ~VM_GC_Operation() { |
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111 CollectedHeap* ch = Universe::heap(); |
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112 ch->collector_policy()->set_all_soft_refs_clear(false); |
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113 } |
0 | 114 |
115 // Acquire the reference synchronization lock | |
116 virtual bool doit_prologue(); | |
117 // Do notifyAll (if needed) and release held lock | |
118 virtual void doit_epilogue(); | |
119 | |
120 virtual bool allow_nested_vm_operations() const { return true; } | |
121 bool prologue_succeeded() const { return _prologue_succeeded; } | |
122 | |
123 void set_gc_locked() { _gc_locked = true; } | |
124 bool gc_locked() const { return _gc_locked; } | |
125 | |
126 static void notify_gc_begin(bool full = false); | |
127 static void notify_gc_end(); | |
128 }; | |
129 | |
130 | |
131 class VM_GC_HeapInspection: public VM_GC_Operation { | |
132 private: | |
133 outputStream* _out; | |
134 bool _full_gc; | |
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135 bool _need_prologue; |
0 | 136 public: |
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137 VM_GC_HeapInspection(outputStream* out, bool request_full_gc, |
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138 bool need_prologue) : |
0 | 139 VM_GC_Operation(0 /* total collections, dummy, ignored */, |
2225 | 140 GCCause::_heap_inspection /* GC Cause */, |
0 | 141 0 /* total full collections, dummy, ignored */, |
142 request_full_gc) { | |
143 _out = out; | |
144 _full_gc = request_full_gc; | |
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145 _need_prologue = need_prologue; |
0 | 146 } |
147 | |
148 ~VM_GC_HeapInspection() {} | |
149 virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; } | |
150 virtual bool skip_operation() const; | |
151 virtual bool doit_prologue(); | |
152 virtual void doit(); | |
153 }; | |
154 | |
155 | |
156 class VM_GenCollectForAllocation: public VM_GC_Operation { | |
157 private: | |
158 HeapWord* _res; | |
159 size_t _size; // size of object to be allocated. | |
160 bool _tlab; // alloc is of a tlab. | |
161 public: | |
162 VM_GenCollectForAllocation(size_t size, | |
163 bool tlab, | |
164 unsigned int gc_count_before) | |
2225 | 165 : VM_GC_Operation(gc_count_before, GCCause::_allocation_failure), |
0 | 166 _size(size), |
167 _tlab(tlab) { | |
168 _res = NULL; | |
169 } | |
170 ~VM_GenCollectForAllocation() {} | |
171 virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; } | |
172 virtual void doit(); | |
173 HeapWord* result() const { return _res; } | |
174 }; | |
175 | |
176 | |
177 // VM operation to invoke a collection of the heap as a | |
178 // GenCollectedHeap heap. | |
179 class VM_GenCollectFull: public VM_GC_Operation { | |
180 private: | |
181 int _max_level; | |
182 public: | |
183 VM_GenCollectFull(unsigned int gc_count_before, | |
184 unsigned int full_gc_count_before, | |
185 GCCause::Cause gc_cause, | |
186 int max_level) | |
2225 | 187 : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */), |
188 _max_level(max_level) { } | |
0 | 189 ~VM_GenCollectFull() {} |
190 virtual VMOp_Type type() const { return VMOp_GenCollectFull; } | |
191 virtual void doit(); | |
192 }; | |
139
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193 |
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194 class VM_GenCollectForPermanentAllocation: public VM_GC_Operation { |
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195 private: |
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196 HeapWord* _res; |
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197 size_t _size; // size of object to be allocated |
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198 public: |
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199 VM_GenCollectForPermanentAllocation(size_t size, |
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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 _size(size) { |
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205 _res = NULL; |
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206 _gc_cause = gc_cause; |
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207 } |
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208 ~VM_GenCollectForPermanentAllocation() {} |
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209 virtual VMOp_Type type() const { return VMOp_GenCollectForPermanentAllocation; } |
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210 virtual void doit(); |
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211 HeapWord* result() const { return _res; } |
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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 |