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annotate src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
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| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | 2a1472c30599 |
| children | b2a00dd3117c |
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| 0 | 1 /* |
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2 * Copyright (c) 2005, 2009, 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 |
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62 #define OBJARRAY_QUEUE_SIZE (1 << NOT_LP64(12) LP64_ONLY(13)) |
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63 typedef GenericTaskQueue<ObjArrayTask, OBJARRAY_QUEUE_SIZE> ObjArrayTaskQueue; |
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64 typedef GenericTaskQueueSet<ObjArrayTaskQueue> ObjArrayTaskQueueSet; |
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65 #undef OBJARRAY_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: |
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75 OopTaskQueue _marking_stack; |
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76 GrowableArray<oop>* _overflow_stack; |
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77 |
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78 typedef GrowableArray<ObjArrayTask> ObjArrayOverflowStack; |
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79 ObjArrayTaskQueue _objarray_queue; |
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80 ObjArrayOverflowStack* _objarray_overflow_stack; |
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81 |
| 0 | 82 // Is there a way to reuse the _marking_stack for the |
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83 // saving empty regions? For now just create a different |
| 0 | 84 // type of TaskQueue. |
| 85 | |
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86 #ifdef USE_RegionTaskQueueWithOverflow |
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87 RegionTaskQueueWithOverflow _region_stack; |
| 0 | 88 #else |
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89 RegionTaskQueue _region_stack; |
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90 GrowableArray<size_t>* _region_overflow_stack; |
| 0 | 91 #endif |
| 92 | |
| 93 #if 1 // does this happen enough to need a per thread stack? | |
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94 GrowableArray<Klass*>* _revisit_klass_stack; |
| 941 | 95 GrowableArray<DataLayout*>* _revisit_mdo_stack; |
| 0 | 96 #endif |
| 97 static ParMarkBitMap* _mark_bitmap; | |
| 98 | |
| 99 Action _action; | |
| 100 | |
| 101 static PSOldGen* old_gen() { return _old_gen; } | |
| 102 static ObjectStartArray* start_array() { return _start_array; } | |
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103 static OopTaskQueueSet* stack_array() { return _stack_array; } |
| 0 | 104 |
| 105 static void initialize(ParMarkBitMap* mbm); | |
| 106 | |
| 107 protected: | |
| 108 // Array of tasks. Needed by the ParallelTaskTerminator. | |
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109 static RegionTaskQueueSet* region_array() { return _region_array; } |
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110 OopTaskQueue* marking_stack() { return &_marking_stack; } |
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111 GrowableArray<oop>* overflow_stack() { return _overflow_stack; } |
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112 #ifdef USE_RegionTaskQueueWithOverflow |
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113 RegionTaskQueueWithOverflow* region_stack() { return &_region_stack; } |
| 0 | 114 #else |
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115 RegionTaskQueue* region_stack() { return &_region_stack; } |
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116 GrowableArray<size_t>* region_overflow_stack() { |
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117 return _region_overflow_stack; |
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118 } |
| 0 | 119 #endif |
| 120 | |
| 121 // Pushes onto the marking stack. If the marking stack is full, | |
| 122 // pushes onto the overflow stack. | |
| 123 void stack_push(oop obj); | |
| 124 // Do not implement an equivalent stack_pop. Deal with the | |
| 125 // marking stack and overflow stack directly. | |
| 126 | |
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127 // Pushes onto the region stack. If the region stack is full, |
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128 // pushes onto the region overflow stack. |
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129 void region_stack_push(size_t region_index); |
| 0 | 130 |
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131 public: |
| 0 | 132 Action action() { return _action; } |
| 133 void set_action(Action v) { _action = v; } | |
| 134 | |
| 135 inline static ParCompactionManager* manager_array(int index); | |
| 136 | |
| 137 ParCompactionManager(); | |
| 138 ~ParCompactionManager(); | |
| 139 | |
| 140 void allocate_stacks(); | |
| 141 void deallocate_stacks(); | |
| 142 ParMarkBitMap* mark_bitmap() { return _mark_bitmap; } | |
| 143 | |
| 144 // Take actions in preparation for a compaction. | |
| 145 static void reset(); | |
| 146 | |
| 147 // void drain_stacks(); | |
| 148 | |
| 149 bool should_update(); | |
| 150 bool should_copy(); | |
| 151 bool should_verify_only(); | |
| 152 bool should_reset_only(); | |
| 153 | |
| 154 #if 1 | |
| 155 // Probably stays as a growable array | |
| 156 GrowableArray<Klass*>* revisit_klass_stack() { return _revisit_klass_stack; } | |
| 941 | 157 GrowableArray<DataLayout*>* revisit_mdo_stack() { return _revisit_mdo_stack; } |
| 0 | 158 #endif |
| 159 | |
| 160 // Save oop for later processing. Must not fail. | |
| 161 void save_for_scanning(oop m); | |
| 162 // Get a oop for scanning. If returns null, no oop were found. | |
| 163 oop retrieve_for_scanning(); | |
| 164 | |
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165 inline void push_objarray(oop obj, size_t index); |
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166 |
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167 // Save region for later processing. Must not fail. |
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168 void save_for_processing(size_t region_index); |
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169 // Get a region for processing. If returns null, no region were found. |
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170 bool retrieve_for_processing(size_t& region_index); |
| 0 | 171 |
| 172 // Access function for compaction managers | |
| 173 static ParCompactionManager* gc_thread_compaction_manager(int index); | |
| 174 | |
| 175 static bool steal(int queue_num, int* seed, Task& t) { | |
| 176 return stack_array()->steal(queue_num, seed, t); | |
| 177 } | |
| 178 | |
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179 static bool steal_objarray(int queue_num, int* seed, ObjArrayTask& t) { |
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180 return _objarray_queues->steal(queue_num, seed, t); |
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181 } |
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182 |
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183 static bool steal(int queue_num, int* seed, RegionTask& t) { |
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184 return region_array()->steal(queue_num, seed, t); |
| 0 | 185 } |
| 186 | |
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187 // Process tasks remaining on any marking stack |
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188 void follow_marking_stacks(); |
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189 inline bool marking_stacks_empty() const; |
| 0 | 190 |
| 191 // Process tasks remaining on any stack | |
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192 void drain_region_stacks(); |
| 0 | 193 |
| 194 // Process tasks remaining on any stack | |
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195 void drain_region_overflow_stack(); |
| 0 | 196 |
| 197 // Debugging support | |
| 198 #ifdef ASSERT | |
| 199 bool stacks_have_been_allocated(); | |
| 200 #endif | |
| 201 }; | |
| 202 | |
| 203 inline ParCompactionManager* ParCompactionManager::manager_array(int index) { | |
| 204 assert(_manager_array != NULL, "access of NULL manager_array"); | |
| 205 assert(index >= 0 && index <= (int)ParallelGCThreads, | |
| 206 "out of range manager_array access"); | |
| 207 return _manager_array[index]; | |
| 208 } | |
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209 |
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210 bool ParCompactionManager::marking_stacks_empty() const { |
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211 return _marking_stack.size() == 0 && _overflow_stack->is_empty() && |
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212 _objarray_queue.size() == 0 && _objarray_overflow_stack->is_empty(); |
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213 } |