Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.hpp @ 1638:b2a00dd3117c
6957084: simplify TaskQueue overflow handling
Reviewed-by: ysr, jmasa
| author | jcoomes |
|---|---|
| date | Thu, 01 Jul 2010 21:40:45 -0700 |
| parents | c18cbe5936b8 |
| children | 894b1d7c7e01 |
| rev | line source |
|---|---|
| 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 } |