Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.hpp @ 4132:6d7d0790074d
7119584: UseParallelGC barrier task can be overwritten.
Summary: Provoke a GC for a metadata allocation failure.
Reviewed-by: johnc, iveresov
author | jmasa |
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date | Fri, 09 Dec 2011 19:28:34 -0800 |
parents | 7913e93dca52 |
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0 | 1 /* |
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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_PARALLELSCAVENGE_PSCOMPACTIONMANAGER_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSCOMPACTIONMANAGER_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "utilities/stack.hpp" | |
30 #include "utilities/taskqueue.hpp" | |
31 | |
0 | 32 // Move to some global location |
33 #define HAS_BEEN_MOVED 0x1501d01d | |
34 // End move to some global location | |
35 | |
36 | |
37 class MutableSpace; | |
38 class PSOldGen; | |
39 class ParCompactionManager; | |
40 class ObjectStartArray; | |
41 class ParallelCompactData; | |
42 class ParMarkBitMap; | |
43 | |
44 class ParCompactionManager : public CHeapObj { | |
45 friend class ParallelTaskTerminator; | |
46 friend class ParMarkBitMap; | |
47 friend class PSParallelCompact; | |
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48 friend class StealRegionCompactionTask; |
0 | 49 friend class UpdateAndFillClosure; |
50 friend class RefProcTaskExecutor; | |
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51 friend class IdleGCTask; |
0 | 52 |
53 public: | |
54 | |
55 // ------------------------ Don't putback if not needed | |
56 // Actions that the compaction manager should take. | |
57 enum Action { | |
58 Update, | |
59 Copy, | |
60 UpdateAndCopy, | |
61 CopyAndUpdate, | |
62 NotValid | |
63 }; | |
64 // ------------------------ End don't putback if not needed | |
65 | |
66 private: | |
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67 // 32-bit: 4K * 8 = 32KiB; 64-bit: 8K * 16 = 128KiB |
1638 | 68 #define QUEUE_SIZE (1 << NOT_LP64(12) LP64_ONLY(13)) |
69 typedef OverflowTaskQueue<ObjArrayTask, QUEUE_SIZE> ObjArrayTaskQueue; | |
70 typedef GenericTaskQueueSet<ObjArrayTaskQueue> ObjArrayTaskQueueSet; | |
71 #undef QUEUE_SIZE | |
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72 |
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73 static ParCompactionManager** _manager_array; |
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74 static OopTaskQueueSet* _stack_array; |
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75 static ObjArrayTaskQueueSet* _objarray_queues; |
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76 static ObjectStartArray* _start_array; |
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77 static RegionTaskQueueSet* _region_array; |
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78 static PSOldGen* _old_gen; |
0 | 79 |
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80 private: |
1638 | 81 OverflowTaskQueue<oop> _marking_stack; |
82 ObjArrayTaskQueue _objarray_stack; | |
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83 |
0 | 84 // Is there a way to reuse the _marking_stack for the |
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85 // saving empty regions? For now just create a different |
0 | 86 // type of TaskQueue. |
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87 RegionTaskQueue* _region_stack; |
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88 |
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89 static RegionTaskQueue** _region_list; |
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90 // Index in _region_list for current _region_stack. |
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91 uint _region_stack_index; |
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92 |
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93 // Indexes of recycled region stacks/overflow stacks |
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94 // Stacks of regions to be compacted are embedded in the tasks doing |
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95 // the compaction. A thread that executes the task extracts the |
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96 // region stack and drains it. These threads keep these region |
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97 // stacks for use during compaction task stealing. If a thread |
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98 // gets a second draining task, it pushed its current region stack |
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99 // index into the array _recycled_stack_index and gets a new |
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100 // region stack from the task. A thread that is executing a |
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101 // compaction stealing task without ever having executing a |
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102 // draining task, will get a region stack from _recycled_stack_index. |
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103 // |
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104 // Array of indexes into the array of region stacks. |
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105 static uint* _recycled_stack_index; |
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106 // The index into _recycled_stack_index of the last region stack index |
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107 // pushed. If -1, there are no entries into _recycled_stack_index. |
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108 static int _recycled_top; |
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109 // The index into _recycled_stack_index of the last region stack index |
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110 // popped. If -1, there has not been any entry popped. |
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111 static int _recycled_bottom; |
0 | 112 |
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113 Stack<Klass*> _revisit_klass_stack; |
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114 Stack<DataLayout*> _revisit_mdo_stack; |
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115 |
0 | 116 static ParMarkBitMap* _mark_bitmap; |
117 | |
118 Action _action; | |
119 | |
120 static PSOldGen* old_gen() { return _old_gen; } | |
121 static ObjectStartArray* start_array() { return _start_array; } | |
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122 static OopTaskQueueSet* stack_array() { return _stack_array; } |
0 | 123 |
124 static void initialize(ParMarkBitMap* mbm); | |
125 | |
126 protected: | |
127 // Array of tasks. Needed by the ParallelTaskTerminator. | |
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128 static RegionTaskQueueSet* region_array() { return _region_array; } |
1638 | 129 OverflowTaskQueue<oop>* marking_stack() { return &_marking_stack; } |
0 | 130 |
131 // Pushes onto the marking stack. If the marking stack is full, | |
132 // pushes onto the overflow stack. | |
133 void stack_push(oop obj); | |
134 // Do not implement an equivalent stack_pop. Deal with the | |
135 // marking stack and overflow stack directly. | |
136 | |
1638 | 137 public: |
0 | 138 Action action() { return _action; } |
139 void set_action(Action v) { _action = v; } | |
140 | |
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141 RegionTaskQueue* region_stack() { return _region_stack; } |
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142 void set_region_stack(RegionTaskQueue* v) { _region_stack = v; } |
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143 |
0 | 144 inline static ParCompactionManager* manager_array(int index); |
145 | |
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146 inline static RegionTaskQueue* region_list(int index) { |
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147 return _region_list[index]; |
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148 } |
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149 |
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150 uint region_stack_index() { return _region_stack_index; } |
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151 void set_region_stack_index(uint v) { _region_stack_index = v; } |
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152 |
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153 // Pop and push unique reusable stack index |
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154 static int pop_recycled_stack_index(); |
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155 static void push_recycled_stack_index(uint v); |
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156 static void reset_recycled_stack_index() { |
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157 _recycled_bottom = _recycled_top = -1; |
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158 } |
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159 |
0 | 160 ParCompactionManager(); |
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161 ~ParCompactionManager(); |
0 | 162 |
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163 // Pushes onto the region stack at the given index. If the |
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164 // region stack is full, |
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165 // pushes onto the region overflow stack. |
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166 static void region_list_push(uint stack_index, size_t region_index); |
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167 static void verify_region_list_empty(uint stack_index); |
0 | 168 ParMarkBitMap* mark_bitmap() { return _mark_bitmap; } |
169 | |
170 // Take actions in preparation for a compaction. | |
171 static void reset(); | |
172 | |
173 // void drain_stacks(); | |
174 | |
175 bool should_update(); | |
176 bool should_copy(); | |
177 | |
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178 Stack<Klass*>* revisit_klass_stack() { return &_revisit_klass_stack; } |
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179 Stack<DataLayout*>* revisit_mdo_stack() { return &_revisit_mdo_stack; } |
0 | 180 |
1638 | 181 // Save for later processing. Must not fail. |
182 inline void push(oop obj) { _marking_stack.push(obj); } | |
183 inline void push_objarray(oop objarray, size_t index); | |
184 inline void push_region(size_t index); | |
0 | 185 |
186 // Access function for compaction managers | |
187 static ParCompactionManager* gc_thread_compaction_manager(int index); | |
188 | |
1638 | 189 static bool steal(int queue_num, int* seed, oop& t) { |
0 | 190 return stack_array()->steal(queue_num, seed, t); |
191 } | |
192 | |
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193 static bool steal_objarray(int queue_num, int* seed, ObjArrayTask& t) { |
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194 return _objarray_queues->steal(queue_num, seed, t); |
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195 } |
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196 |
1638 | 197 static bool steal(int queue_num, int* seed, size_t& region) { |
198 return region_array()->steal(queue_num, seed, region); | |
0 | 199 } |
200 | |
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201 // Process tasks remaining on any marking stack |
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202 void follow_marking_stacks(); |
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203 inline bool marking_stacks_empty() const; |
0 | 204 |
205 // Process tasks remaining on any stack | |
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206 void drain_region_stacks(); |
0 | 207 |
208 }; | |
209 | |
210 inline ParCompactionManager* ParCompactionManager::manager_array(int index) { | |
211 assert(_manager_array != NULL, "access of NULL manager_array"); | |
212 assert(index >= 0 && index <= (int)ParallelGCThreads, | |
213 "out of range manager_array access"); | |
214 return _manager_array[index]; | |
215 } | |
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216 |
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217 bool ParCompactionManager::marking_stacks_empty() const { |
1638 | 218 return _marking_stack.is_empty() && _objarray_stack.is_empty(); |
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219 } |
1972 | 220 |
221 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSCOMPACTIONMANAGER_HPP |