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annotate src/share/vm/gc_implementation/parallelScavenge/psPromotionManager.hpp @ 21598:05ecef0a6a24
LinearScanLifetimeAnalysisPhase: special case StackStoreOp.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Thu, 28 May 2015 13:07:25 +0200 |
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0 | 1 /* |
10405 | 2 * Copyright (c) 2002, 2013, 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_PSPROMOTIONMANAGER_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_HPP | |
27 | |
28 #include "gc_implementation/parallelScavenge/psPromotionLAB.hpp" | |
10405 | 29 #include "gc_implementation/shared/gcTrace.hpp" |
30 #include "gc_implementation/shared/copyFailedInfo.hpp" | |
1972 | 31 #include "memory/allocation.hpp" |
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32 #include "memory/padded.hpp" |
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33 #include "utilities/globalDefinitions.hpp" |
1972 | 34 #include "utilities/taskqueue.hpp" |
35 | |
0 | 36 // |
37 // psPromotionManager is used by a single thread to manage object survival | |
38 // during a scavenge. The promotion manager contains thread local data only. | |
39 // | |
10405 | 40 // NOTE! Be careful when allocating the stacks on cheap. If you are going |
0 | 41 // to use a promotion manager in more than one thread, the stacks MUST be |
42 // on cheap. This can lead to memory leaks, though, as they are not auto | |
43 // deallocated. | |
44 // | |
45 // FIX ME FIX ME Add a destructor, and don't rely on the user to drain/flush/deallocate! | |
46 // | |
47 | |
48 // Move to some global location | |
49 #define HAS_BEEN_MOVED 0x1501d01d | |
50 // End move to some global location | |
51 | |
52 class MutableSpace; | |
53 class PSOldGen; | |
54 class ParCompactionManager; | |
55 | |
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56 class PSPromotionManager VALUE_OBJ_CLASS_SPEC { |
0 | 57 friend class PSScavenge; |
58 friend class PSRefProcTaskExecutor; | |
59 private: | |
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60 static PaddedEnd<PSPromotionManager>* _manager_array; |
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61 static OopStarTaskQueueSet* _stack_array_depth; |
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62 static PSOldGen* _old_gen; |
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63 static MutableSpace* _young_space; |
0 | 64 |
1665 | 65 #if TASKQUEUE_STATS |
66 size_t _masked_pushes; | |
67 size_t _masked_steals; | |
68 size_t _arrays_chunked; | |
69 size_t _array_chunks_processed; | |
0 | 70 |
1665 | 71 void print_taskqueue_stats(uint i) const; |
72 void print_local_stats(uint i) const; | |
73 static void print_stats(); | |
0 | 74 |
1665 | 75 void reset_stats(); |
76 #endif // TASKQUEUE_STATS | |
0 | 77 |
78 PSYoungPromotionLAB _young_lab; | |
79 PSOldPromotionLAB _old_lab; | |
80 bool _young_gen_is_full; | |
81 bool _old_gen_is_full; | |
82 | |
83 OopStarTaskQueue _claimed_stack_depth; | |
6197 | 84 OverflowTaskQueue<oop, mtGC> _claimed_stack_breadth; |
0 | 85 |
86 bool _totally_drain; | |
87 uint _target_stack_size; | |
88 | |
89 uint _array_chunk_size; | |
90 uint _min_array_size_for_chunking; | |
91 | |
10405 | 92 PromotionFailedInfo _promotion_failed_info; |
93 | |
0 | 94 // Accessors |
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95 static PSOldGen* old_gen() { return _old_gen; } |
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96 static MutableSpace* young_space() { return _young_space; } |
0 | 97 |
98 inline static PSPromotionManager* manager_array(int index); | |
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99 template <class T> inline void claim_or_forward_internal_depth(T* p); |
0 | 100 |
101 // On the task queues we push reference locations as well as | |
102 // partially-scanned arrays (in the latter case, we push an oop to | |
103 // the from-space image of the array and the length on the | |
104 // from-space image indicates how many entries on the array we still | |
105 // need to scan; this is basically how ParNew does partial array | |
106 // scanning too). To be able to distinguish between reference | |
107 // locations and partially-scanned array oops we simply mask the | |
108 // latter oops with 0x01. The next three methods do the masking, | |
109 // unmasking, and checking whether the oop is masked or not. Notice | |
110 // that the signature of the mask and unmask methods looks a bit | |
111 // strange, as they accept and return different types (oop and | |
112 // oop*). This is because of the difference in types between what | |
113 // the task queue holds (oop*) and oops to partially-scanned arrays | |
114 // (oop). We do all the necessary casting in the mask / unmask | |
115 // methods to avoid sprinkling the rest of the code with more casts. | |
116 | |
113
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117 // These are added to the taskqueue so PS_CHUNKED_ARRAY_OOP_MASK (or any |
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118 // future masks) can't conflict with COMPRESSED_OOP_MASK |
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119 #define PS_CHUNKED_ARRAY_OOP_MASK 0x2 |
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120 |
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121 bool is_oop_masked(StarTask p) { |
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122 // If something is marked chunked it's always treated like wide oop* |
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123 return (((intptr_t)(oop*)p) & PS_CHUNKED_ARRAY_OOP_MASK) == |
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124 PS_CHUNKED_ARRAY_OOP_MASK; |
0 | 125 } |
126 | |
127 oop* mask_chunked_array_oop(oop obj) { | |
128 assert(!is_oop_masked((oop*) obj), "invariant"); | |
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129 oop* ret = (oop*) (cast_from_oop<uintptr_t>(obj) | PS_CHUNKED_ARRAY_OOP_MASK); |
0 | 130 assert(is_oop_masked(ret), "invariant"); |
131 return ret; | |
132 } | |
133 | |
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134 oop unmask_chunked_array_oop(StarTask p) { |
0 | 135 assert(is_oop_masked(p), "invariant"); |
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136 assert(!p.is_narrow(), "chunked array oops cannot be narrow"); |
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137 oop *chunk = (oop*)p; // cast p to oop (uses conversion operator) |
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138 oop ret = oop((oop*)((uintptr_t)chunk & ~PS_CHUNKED_ARRAY_OOP_MASK)); |
0 | 139 assert(!is_oop_masked((oop*) ret), "invariant"); |
140 return ret; | |
141 } | |
142 | |
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143 template <class T> void process_array_chunk_work(oop obj, |
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144 int start, int end); |
0 | 145 void process_array_chunk(oop old); |
146 | |
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147 template <class T> void push_depth(T* p) { |
1638 | 148 claimed_stack_depth()->push(p); |
0 | 149 } |
150 | |
151 protected: | |
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152 static OopStarTaskQueueSet* stack_array_depth() { return _stack_array_depth; } |
0 | 153 public: |
154 // Static | |
155 static void initialize(); | |
156 | |
157 static void pre_scavenge(); | |
10405 | 158 static bool post_scavenge(YoungGCTracer& gc_tracer); |
0 | 159 |
160 static PSPromotionManager* gc_thread_promotion_manager(int index); | |
161 static PSPromotionManager* vm_thread_promotion_manager(); | |
162 | |
163 static bool steal_depth(int queue_num, int* seed, StarTask& t) { | |
164 return stack_array_depth()->steal(queue_num, seed, t); | |
165 } | |
166 | |
167 PSPromotionManager(); | |
168 | |
169 // Accessors | |
170 OopStarTaskQueue* claimed_stack_depth() { | |
171 return &_claimed_stack_depth; | |
172 } | |
173 | |
174 bool young_gen_is_full() { return _young_gen_is_full; } | |
175 | |
176 bool old_gen_is_full() { return _old_gen_is_full; } | |
177 void set_old_gen_is_full(bool state) { _old_gen_is_full = state; } | |
178 | |
179 // Promotion methods | |
4909 | 180 template<bool promote_immediately> oop copy_to_survivor_space(oop o); |
0 | 181 oop oop_promotion_failed(oop obj, markOop obj_mark); |
182 | |
183 void reset(); | |
184 | |
185 void flush_labs(); | |
186 void drain_stacks(bool totally_drain) { | |
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187 drain_stacks_depth(totally_drain); |
0 | 188 } |
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189 public: |
0 | 190 void drain_stacks_cond_depth() { |
191 if (claimed_stack_depth()->size() > _target_stack_size) { | |
192 drain_stacks_depth(false); | |
193 } | |
194 } | |
195 void drain_stacks_depth(bool totally_drain); | |
196 | |
197 bool stacks_empty() { | |
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198 return claimed_stack_depth()->is_empty(); |
0 | 199 } |
200 | |
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201 inline void process_popped_location_depth(StarTask p); |
0 | 202 |
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203 template <class T> inline void claim_or_forward_depth(T* p); |
0 | 204 |
1665 | 205 TASKQUEUE_STATS_ONLY(inline void record_steal(StarTask& p);) |
0 | 206 }; |
1972 | 207 |
208 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_HPP |