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annotate src/share/vm/gc_implementation/parallelScavenge/psPromotionManager.hpp @ 1286:ab75c83d7c37
Merge
author | johnc |
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date | Tue, 02 Mar 2010 13:57:46 -0800 |
parents | d1605aabd0a1 |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 2002-2008 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // | |
26 // psPromotionManager is used by a single thread to manage object survival | |
27 // during a scavenge. The promotion manager contains thread local data only. | |
28 // | |
29 // NOTE! Be carefull when allocating the stacks on cheap. If you are going | |
30 // to use a promotion manager in more than one thread, the stacks MUST be | |
31 // on cheap. This can lead to memory leaks, though, as they are not auto | |
32 // deallocated. | |
33 // | |
34 // FIX ME FIX ME Add a destructor, and don't rely on the user to drain/flush/deallocate! | |
35 // | |
36 | |
37 // Move to some global location | |
38 #define HAS_BEEN_MOVED 0x1501d01d | |
39 // End move to some global location | |
40 | |
41 class MutableSpace; | |
42 class PSOldGen; | |
43 class ParCompactionManager; | |
44 | |
45 #define PS_PM_STATS 0 | |
46 | |
47 class PSPromotionManager : public CHeapObj { | |
48 friend class PSScavenge; | |
49 friend class PSRefProcTaskExecutor; | |
50 private: | |
51 static PSPromotionManager** _manager_array; | |
52 static OopStarTaskQueueSet* _stack_array_depth; | |
53 static OopTaskQueueSet* _stack_array_breadth; | |
54 static PSOldGen* _old_gen; | |
55 static MutableSpace* _young_space; | |
56 | |
57 #if PS_PM_STATS | |
58 uint _total_pushes; | |
59 uint _masked_pushes; | |
60 | |
61 uint _overflow_pushes; | |
62 uint _max_overflow_length; | |
63 | |
64 uint _arrays_chunked; | |
65 uint _array_chunks_processed; | |
66 | |
67 uint _total_steals; | |
68 uint _masked_steals; | |
69 | |
70 void print_stats(uint i); | |
71 static void print_stats(); | |
72 #endif // PS_PM_STATS | |
73 | |
74 PSYoungPromotionLAB _young_lab; | |
75 PSOldPromotionLAB _old_lab; | |
76 bool _young_gen_is_full; | |
77 bool _old_gen_is_full; | |
78 PrefetchQueue _prefetch_queue; | |
79 | |
80 OopStarTaskQueue _claimed_stack_depth; | |
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81 GrowableArray<StarTask>* _overflow_stack_depth; |
0 | 82 OopTaskQueue _claimed_stack_breadth; |
83 GrowableArray<oop>* _overflow_stack_breadth; | |
84 | |
85 bool _depth_first; | |
86 bool _totally_drain; | |
87 uint _target_stack_size; | |
88 | |
89 uint _array_chunk_size; | |
90 uint _min_array_size_for_chunking; | |
91 | |
92 // Accessors | |
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93 static PSOldGen* old_gen() { return _old_gen; } |
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94 static MutableSpace* young_space() { return _young_space; } |
0 | 95 |
96 inline static PSPromotionManager* manager_array(int index); | |
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97 template <class T> inline void claim_or_forward_internal_depth(T* p); |
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98 template <class T> inline void claim_or_forward_internal_breadth(T* p); |
0 | 99 |
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100 GrowableArray<StarTask>* overflow_stack_depth() { return _overflow_stack_depth; } |
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101 GrowableArray<oop>* overflow_stack_breadth() { return _overflow_stack_breadth; } |
0 | 102 |
103 // On the task queues we push reference locations as well as | |
104 // partially-scanned arrays (in the latter case, we push an oop to | |
105 // the from-space image of the array and the length on the | |
106 // from-space image indicates how many entries on the array we still | |
107 // need to scan; this is basically how ParNew does partial array | |
108 // scanning too). To be able to distinguish between reference | |
109 // locations and partially-scanned array oops we simply mask the | |
110 // latter oops with 0x01. The next three methods do the masking, | |
111 // unmasking, and checking whether the oop is masked or not. Notice | |
112 // that the signature of the mask and unmask methods looks a bit | |
113 // strange, as they accept and return different types (oop and | |
114 // oop*). This is because of the difference in types between what | |
115 // the task queue holds (oop*) and oops to partially-scanned arrays | |
116 // (oop). We do all the necessary casting in the mask / unmask | |
117 // methods to avoid sprinkling the rest of the code with more casts. | |
118 | |
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119 // These are added to the taskqueue so PS_CHUNKED_ARRAY_OOP_MASK (or any |
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120 // future masks) can't conflict with COMPRESSED_OOP_MASK |
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121 #define PS_CHUNKED_ARRAY_OOP_MASK 0x2 |
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122 |
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123 bool is_oop_masked(StarTask p) { |
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124 // If something is marked chunked it's always treated like wide oop* |
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125 return (((intptr_t)(oop*)p) & PS_CHUNKED_ARRAY_OOP_MASK) == |
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126 PS_CHUNKED_ARRAY_OOP_MASK; |
0 | 127 } |
128 | |
129 oop* mask_chunked_array_oop(oop obj) { | |
130 assert(!is_oop_masked((oop*) obj), "invariant"); | |
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131 oop* ret = (oop*) ((uintptr_t)obj | PS_CHUNKED_ARRAY_OOP_MASK); |
0 | 132 assert(is_oop_masked(ret), "invariant"); |
133 return ret; | |
134 } | |
135 | |
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136 oop unmask_chunked_array_oop(StarTask p) { |
0 | 137 assert(is_oop_masked(p), "invariant"); |
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138 assert(!p.is_narrow(), "chunked array oops cannot be narrow"); |
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139 oop *chunk = (oop*)p; // cast p to oop (uses conversion operator) |
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140 oop ret = oop((oop*)((uintptr_t)chunk & ~PS_CHUNKED_ARRAY_OOP_MASK)); |
0 | 141 assert(!is_oop_masked((oop*) ret), "invariant"); |
142 return ret; | |
143 } | |
144 | |
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145 template <class T> void process_array_chunk_work(oop obj, |
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146 int start, int end); |
0 | 147 void process_array_chunk(oop old); |
148 | |
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149 template <class T> void push_depth(T* p) { |
0 | 150 assert(depth_first(), "pre-condition"); |
151 | |
152 #if PS_PM_STATS | |
153 ++_total_pushes; | |
154 #endif // PS_PM_STATS | |
155 | |
156 if (!claimed_stack_depth()->push(p)) { | |
157 overflow_stack_depth()->push(p); | |
158 #if PS_PM_STATS | |
159 ++_overflow_pushes; | |
160 uint stack_length = (uint) overflow_stack_depth()->length(); | |
161 if (stack_length > _max_overflow_length) { | |
162 _max_overflow_length = stack_length; | |
163 } | |
164 #endif // PS_PM_STATS | |
165 } | |
166 } | |
167 | |
168 void push_breadth(oop o) { | |
169 assert(!depth_first(), "pre-condition"); | |
170 | |
171 #if PS_PM_STATS | |
172 ++_total_pushes; | |
173 #endif // PS_PM_STATS | |
174 | |
175 if(!claimed_stack_breadth()->push(o)) { | |
176 overflow_stack_breadth()->push(o); | |
177 #if PS_PM_STATS | |
178 ++_overflow_pushes; | |
179 uint stack_length = (uint) overflow_stack_breadth()->length(); | |
180 if (stack_length > _max_overflow_length) { | |
181 _max_overflow_length = stack_length; | |
182 } | |
183 #endif // PS_PM_STATS | |
184 } | |
185 } | |
186 | |
187 protected: | |
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188 static OopStarTaskQueueSet* stack_array_depth() { return _stack_array_depth; } |
0 | 189 static OopTaskQueueSet* stack_array_breadth() { return _stack_array_breadth; } |
190 | |
191 public: | |
192 // Static | |
193 static void initialize(); | |
194 | |
195 static void pre_scavenge(); | |
196 static void post_scavenge(); | |
197 | |
198 static PSPromotionManager* gc_thread_promotion_manager(int index); | |
199 static PSPromotionManager* vm_thread_promotion_manager(); | |
200 | |
201 static bool steal_depth(int queue_num, int* seed, StarTask& t) { | |
202 assert(stack_array_depth() != NULL, "invariant"); | |
203 return stack_array_depth()->steal(queue_num, seed, t); | |
204 } | |
205 | |
206 static bool steal_breadth(int queue_num, int* seed, Task& t) { | |
207 assert(stack_array_breadth() != NULL, "invariant"); | |
208 return stack_array_breadth()->steal(queue_num, seed, t); | |
209 } | |
210 | |
211 PSPromotionManager(); | |
212 | |
213 // Accessors | |
214 OopStarTaskQueue* claimed_stack_depth() { | |
215 return &_claimed_stack_depth; | |
216 } | |
217 OopTaskQueue* claimed_stack_breadth() { | |
218 return &_claimed_stack_breadth; | |
219 } | |
220 | |
221 bool young_gen_is_full() { return _young_gen_is_full; } | |
222 | |
223 bool old_gen_is_full() { return _old_gen_is_full; } | |
224 void set_old_gen_is_full(bool state) { _old_gen_is_full = state; } | |
225 | |
226 // Promotion methods | |
227 oop copy_to_survivor_space(oop o, bool depth_first); | |
228 oop oop_promotion_failed(oop obj, markOop obj_mark); | |
229 | |
230 void reset(); | |
231 | |
232 void flush_labs(); | |
233 void drain_stacks(bool totally_drain) { | |
234 if (depth_first()) { | |
235 drain_stacks_depth(totally_drain); | |
236 } else { | |
237 drain_stacks_breadth(totally_drain); | |
238 } | |
239 } | |
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240 public: |
0 | 241 void drain_stacks_cond_depth() { |
242 if (claimed_stack_depth()->size() > _target_stack_size) { | |
243 drain_stacks_depth(false); | |
244 } | |
245 } | |
246 void drain_stacks_depth(bool totally_drain); | |
247 void drain_stacks_breadth(bool totally_drain); | |
248 | |
249 bool claimed_stack_empty() { | |
250 if (depth_first()) { | |
251 return claimed_stack_depth()->size() <= 0; | |
252 } else { | |
253 return claimed_stack_breadth()->size() <= 0; | |
254 } | |
255 } | |
256 bool overflow_stack_empty() { | |
257 if (depth_first()) { | |
258 return overflow_stack_depth()->length() <= 0; | |
259 } else { | |
260 return overflow_stack_breadth()->length() <= 0; | |
261 } | |
262 } | |
263 bool stacks_empty() { | |
264 return claimed_stack_empty() && overflow_stack_empty(); | |
265 } | |
266 bool depth_first() { | |
267 return _depth_first; | |
268 } | |
269 | |
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270 inline void process_popped_location_depth(StarTask p); |
0 | 271 |
272 inline void flush_prefetch_queue(); | |
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273 template <class T> inline void claim_or_forward_depth(T* p); |
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274 template <class T> inline void claim_or_forward_breadth(T* p); |
0 | 275 |
276 #if PS_PM_STATS | |
277 void increment_steals(oop* p = NULL) { | |
278 _total_steals += 1; | |
279 if (p != NULL && is_oop_masked(p)) { | |
280 _masked_steals += 1; | |
281 } | |
282 } | |
283 #endif // PS_PM_STATS | |
284 }; |