Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.hpp @ 1656:4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
Summary: G1 was not handling explicit GCs correctly in many ways. It does now. See the CR for the list of improvements contained in this changeset.
Reviewed-by: iveresov, ysr, johnc
author | tonyp |
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date | Mon, 28 Jun 2010 14:13:17 -0400 |
parents | b2a00dd3117c |
children | 894b1d7c7e01 |
rev | line source |
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0 | 1 /* |
1638 | 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 // Move to some global location | |
26 #define HAS_BEEN_MOVED 0x1501d01d | |
27 // End move to some global location | |
28 | |
29 | |
30 class MutableSpace; | |
31 class PSOldGen; | |
32 class ParCompactionManager; | |
33 class ObjectStartArray; | |
34 class ParallelCompactData; | |
35 class ParMarkBitMap; | |
36 | |
37 class ParCompactionManager : public CHeapObj { | |
38 friend class ParallelTaskTerminator; | |
39 friend class ParMarkBitMap; | |
40 friend class PSParallelCompact; | |
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41 friend class StealRegionCompactionTask; |
0 | 42 friend class UpdateAndFillClosure; |
43 friend class RefProcTaskExecutor; | |
44 | |
45 public: | |
46 | |
47 // ------------------------ Don't putback if not needed | |
48 // Actions that the compaction manager should take. | |
49 enum Action { | |
50 Update, | |
51 Copy, | |
52 UpdateAndCopy, | |
53 CopyAndUpdate, | |
54 VerifyUpdate, | |
55 ResetObjects, | |
56 NotValid | |
57 }; | |
58 // ------------------------ End don't putback if not needed | |
59 | |
60 private: | |
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61 // 32-bit: 4K * 8 = 32KiB; 64-bit: 8K * 16 = 128KiB |
1638 | 62 #define QUEUE_SIZE (1 << NOT_LP64(12) LP64_ONLY(13)) |
63 typedef OverflowTaskQueue<ObjArrayTask, QUEUE_SIZE> ObjArrayTaskQueue; | |
64 typedef GenericTaskQueueSet<ObjArrayTaskQueue> ObjArrayTaskQueueSet; | |
65 #undef QUEUE_SIZE | |
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66 |
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67 static ParCompactionManager** _manager_array; |
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68 static OopTaskQueueSet* _stack_array; |
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69 static ObjArrayTaskQueueSet* _objarray_queues; |
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70 static ObjectStartArray* _start_array; |
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71 static RegionTaskQueueSet* _region_array; |
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72 static PSOldGen* _old_gen; |
0 | 73 |
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74 private: |
1638 | 75 OverflowTaskQueue<oop> _marking_stack; |
76 ObjArrayTaskQueue _objarray_stack; | |
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77 |
0 | 78 // Is there a way to reuse the _marking_stack for the |
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79 // saving empty regions? For now just create a different |
0 | 80 // type of TaskQueue. |
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81 RegionTaskQueue _region_stack; |
0 | 82 |
83 #if 1 // does this happen enough to need a per thread stack? | |
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84 GrowableArray<Klass*>* _revisit_klass_stack; |
941 | 85 GrowableArray<DataLayout*>* _revisit_mdo_stack; |
0 | 86 #endif |
87 static ParMarkBitMap* _mark_bitmap; | |
88 | |
89 Action _action; | |
90 | |
91 static PSOldGen* old_gen() { return _old_gen; } | |
92 static ObjectStartArray* start_array() { return _start_array; } | |
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93 static OopTaskQueueSet* stack_array() { return _stack_array; } |
0 | 94 |
95 static void initialize(ParMarkBitMap* mbm); | |
96 | |
97 protected: | |
98 // Array of tasks. Needed by the ParallelTaskTerminator. | |
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99 static RegionTaskQueueSet* region_array() { return _region_array; } |
1638 | 100 OverflowTaskQueue<oop>* marking_stack() { return &_marking_stack; } |
101 RegionTaskQueue* region_stack() { return &_region_stack; } | |
0 | 102 |
103 // Pushes onto the marking stack. If the marking stack is full, | |
104 // pushes onto the overflow stack. | |
105 void stack_push(oop obj); | |
106 // Do not implement an equivalent stack_pop. Deal with the | |
107 // marking stack and overflow stack directly. | |
108 | |
1638 | 109 public: |
0 | 110 Action action() { return _action; } |
111 void set_action(Action v) { _action = v; } | |
112 | |
113 inline static ParCompactionManager* manager_array(int index); | |
114 | |
115 ParCompactionManager(); | |
116 ~ParCompactionManager(); | |
117 | |
118 void allocate_stacks(); | |
119 void deallocate_stacks(); | |
120 ParMarkBitMap* mark_bitmap() { return _mark_bitmap; } | |
121 | |
122 // Take actions in preparation for a compaction. | |
123 static void reset(); | |
124 | |
125 // void drain_stacks(); | |
126 | |
127 bool should_update(); | |
128 bool should_copy(); | |
129 bool should_verify_only(); | |
130 bool should_reset_only(); | |
131 | |
132 #if 1 | |
133 // Probably stays as a growable array | |
134 GrowableArray<Klass*>* revisit_klass_stack() { return _revisit_klass_stack; } | |
941 | 135 GrowableArray<DataLayout*>* revisit_mdo_stack() { return _revisit_mdo_stack; } |
0 | 136 #endif |
137 | |
1638 | 138 // Save for later processing. Must not fail. |
139 inline void push(oop obj) { _marking_stack.push(obj); } | |
140 inline void push_objarray(oop objarray, size_t index); | |
141 inline void push_region(size_t index); | |
0 | 142 |
143 // Access function for compaction managers | |
144 static ParCompactionManager* gc_thread_compaction_manager(int index); | |
145 | |
1638 | 146 static bool steal(int queue_num, int* seed, oop& t) { |
0 | 147 return stack_array()->steal(queue_num, seed, t); |
148 } | |
149 | |
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150 static bool steal_objarray(int queue_num, int* seed, ObjArrayTask& t) { |
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151 return _objarray_queues->steal(queue_num, seed, t); |
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152 } |
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153 |
1638 | 154 static bool steal(int queue_num, int* seed, size_t& region) { |
155 return region_array()->steal(queue_num, seed, region); | |
0 | 156 } |
157 | |
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158 // Process tasks remaining on any marking stack |
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159 void follow_marking_stacks(); |
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160 inline bool marking_stacks_empty() const; |
0 | 161 |
162 // Process tasks remaining on any stack | |
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163 void drain_region_stacks(); |
0 | 164 |
165 // Debugging support | |
166 #ifdef ASSERT | |
167 bool stacks_have_been_allocated(); | |
168 #endif | |
169 }; | |
170 | |
171 inline ParCompactionManager* ParCompactionManager::manager_array(int index) { | |
172 assert(_manager_array != NULL, "access of NULL manager_array"); | |
173 assert(index >= 0 && index <= (int)ParallelGCThreads, | |
174 "out of range manager_array access"); | |
175 return _manager_array[index]; | |
176 } | |
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177 |
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178 bool ParCompactionManager::marking_stacks_empty() const { |
1638 | 179 return _marking_stack.is_empty() && _objarray_stack.is_empty(); |
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180 } |