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annotate src/share/vm/gc_implementation/shared/vmGCOperations.hpp @ 1562:dfe27f03244a
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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 | |
25 // The following class hierarchy represents | |
26 // a set of operations (VM_Operation) related to GC. | |
27 // | |
28 // VM_Operation | |
29 // VM_GC_Operation | |
30 // VM_GC_HeapInspection | |
31 // VM_GenCollectForAllocation | |
32 // VM_GenCollectFull | |
33 // VM_GenCollectFullConcurrent | |
34 // VM_ParallelGCFailedAllocation | |
35 // VM_ParallelGCFailedPermanentAllocation | |
36 // VM_ParallelGCSystemGC | |
37 // VM_GC_Operation | |
38 // - implements methods common to all classes in the hierarchy: | |
39 // prevents multiple gc requests and manages lock on heap; | |
40 // | |
41 // VM_GC_HeapInspection | |
42 // - prints class histogram on SIGBREAK if PrintClassHistogram | |
43 // is specified; and also the attach "inspectheap" operation | |
44 // | |
45 // VM_GenCollectForAllocation | |
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46 // VM_GenCollectForPermanentAllocation |
0 | 47 // VM_ParallelGCFailedAllocation |
48 // VM_ParallelGCFailedPermanentAllocation | |
49 // - this operation is invoked when allocation is failed; | |
50 // operation performs garbage collection and tries to | |
51 // allocate afterwards; | |
52 // | |
53 // VM_GenCollectFull | |
54 // VM_GenCollectFullConcurrent | |
55 // VM_ParallelGCSystemGC | |
56 // - these operations preform full collection of heaps of | |
57 // different kind | |
58 // | |
59 | |
60 class VM_GC_Operation: public VM_Operation { | |
61 protected: | |
62 BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL) | |
63 unsigned int _gc_count_before; // gc count before acquiring PLL | |
64 unsigned int _full_gc_count_before; // full gc count before acquiring PLL | |
65 bool _full; // whether a "full" collection | |
66 bool _prologue_succeeded; // whether doit_prologue succeeded | |
67 GCCause::Cause _gc_cause; // the putative cause for this gc op | |
68 bool _gc_locked; // will be set if gc was locked | |
69 | |
70 virtual bool skip_operation() const; | |
71 | |
72 // java.lang.ref.Reference support | |
73 void acquire_pending_list_lock(); | |
74 void release_and_notify_pending_list_lock(); | |
75 | |
76 public: | |
77 VM_GC_Operation(unsigned int gc_count_before, | |
78 unsigned int full_gc_count_before = 0, | |
79 bool full = false) { | |
80 _full = full; | |
81 _prologue_succeeded = false; | |
82 _gc_count_before = gc_count_before; | |
83 | |
84 // A subclass constructor will likely overwrite the following | |
85 _gc_cause = GCCause::_no_cause_specified; | |
86 | |
87 _gc_locked = false; | |
88 | |
89 if (full) { | |
90 _full_gc_count_before = full_gc_count_before; | |
91 } | |
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92 // In ParallelScavengeHeap::mem_allocate() collections can be |
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93 // executed within a loop and _all_soft_refs_clear can be set |
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94 // true after they have been cleared by a collection and another |
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95 // collection started so that _all_soft_refs_clear can be true |
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96 // when this collection is started. Don't assert that |
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97 // _all_soft_refs_clear have to be false here even though |
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98 // mutators have run. Soft refs will be cleared again in this |
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99 // collection. |
0 | 100 } |
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101 ~VM_GC_Operation() { |
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102 CollectedHeap* ch = Universe::heap(); |
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103 ch->collector_policy()->set_all_soft_refs_clear(false); |
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104 } |
0 | 105 |
106 // Acquire the reference synchronization lock | |
107 virtual bool doit_prologue(); | |
108 // Do notifyAll (if needed) and release held lock | |
109 virtual void doit_epilogue(); | |
110 | |
111 virtual bool allow_nested_vm_operations() const { return true; } | |
112 bool prologue_succeeded() const { return _prologue_succeeded; } | |
113 | |
114 void set_gc_locked() { _gc_locked = true; } | |
115 bool gc_locked() const { return _gc_locked; } | |
116 | |
117 static void notify_gc_begin(bool full = false); | |
118 static void notify_gc_end(); | |
119 }; | |
120 | |
121 | |
122 class VM_GC_HeapInspection: public VM_GC_Operation { | |
123 private: | |
124 outputStream* _out; | |
125 bool _full_gc; | |
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126 bool _need_prologue; |
0 | 127 public: |
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128 VM_GC_HeapInspection(outputStream* out, bool request_full_gc, |
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129 bool need_prologue) : |
0 | 130 VM_GC_Operation(0 /* total collections, dummy, ignored */, |
131 0 /* total full collections, dummy, ignored */, | |
132 request_full_gc) { | |
133 _out = out; | |
134 _full_gc = request_full_gc; | |
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135 _need_prologue = need_prologue; |
0 | 136 } |
137 | |
138 ~VM_GC_HeapInspection() {} | |
139 virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; } | |
140 virtual bool skip_operation() const; | |
141 virtual bool doit_prologue(); | |
142 virtual void doit(); | |
143 }; | |
144 | |
145 | |
146 class VM_GenCollectForAllocation: public VM_GC_Operation { | |
147 private: | |
148 HeapWord* _res; | |
149 size_t _size; // size of object to be allocated. | |
150 bool _tlab; // alloc is of a tlab. | |
151 public: | |
152 VM_GenCollectForAllocation(size_t size, | |
153 bool tlab, | |
154 unsigned int gc_count_before) | |
155 : VM_GC_Operation(gc_count_before), | |
156 _size(size), | |
157 _tlab(tlab) { | |
158 _res = NULL; | |
159 } | |
160 ~VM_GenCollectForAllocation() {} | |
161 virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; } | |
162 virtual void doit(); | |
163 HeapWord* result() const { return _res; } | |
164 }; | |
165 | |
166 | |
167 // VM operation to invoke a collection of the heap as a | |
168 // GenCollectedHeap heap. | |
169 class VM_GenCollectFull: public VM_GC_Operation { | |
170 private: | |
171 int _max_level; | |
172 public: | |
173 VM_GenCollectFull(unsigned int gc_count_before, | |
174 unsigned int full_gc_count_before, | |
175 GCCause::Cause gc_cause, | |
176 int max_level) | |
177 : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */), | |
178 _max_level(max_level) | |
179 { _gc_cause = gc_cause; } | |
180 ~VM_GenCollectFull() {} | |
181 virtual VMOp_Type type() const { return VMOp_GenCollectFull; } | |
182 virtual void doit(); | |
183 }; | |
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184 |
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185 class VM_GenCollectForPermanentAllocation: public VM_GC_Operation { |
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186 private: |
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187 HeapWord* _res; |
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188 size_t _size; // size of object to be allocated |
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189 public: |
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190 VM_GenCollectForPermanentAllocation(size_t size, |
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191 unsigned int gc_count_before, |
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192 unsigned int full_gc_count_before, |
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193 GCCause::Cause gc_cause) |
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194 : VM_GC_Operation(gc_count_before, full_gc_count_before, true), |
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195 _size(size) { |
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196 _res = NULL; |
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197 _gc_cause = gc_cause; |
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198 } |
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199 ~VM_GenCollectForPermanentAllocation() {} |
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200 virtual VMOp_Type type() const { return VMOp_GenCollectForPermanentAllocation; } |
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201 virtual void doit(); |
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202 HeapWord* result() const { return _res; } |
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203 }; |