Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parNew/parNewGeneration.hpp @ 1286:ab75c83d7c37
Merge
author | johnc |
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date | Tue, 02 Mar 2010 13:57:46 -0800 |
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children | c18cbe5936b8 |
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0 | 1 /* |
579 | 2 * Copyright 2001-2009 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 class ChunkArray; | |
26 class ParScanWithoutBarrierClosure; | |
27 class ParScanWithBarrierClosure; | |
28 class ParRootScanWithoutBarrierClosure; | |
29 class ParRootScanWithBarrierTwoGensClosure; | |
30 class ParEvacuateFollowersClosure; | |
31 | |
32 // It would be better if these types could be kept local to the .cpp file, | |
33 // but they must be here to allow ParScanClosure::do_oop_work to be defined | |
34 // in genOopClosures.inline.hpp. | |
35 | |
695 | 36 typedef OopTaskQueue ObjToScanQueue; |
37 typedef OopTaskQueueSet ObjToScanQueueSet; | |
0 | 38 |
39 // Enable this to get push/pop/steal stats. | |
40 const int PAR_STATS_ENABLED = 0; | |
41 | |
42 class ParKeepAliveClosure: public DefNewGeneration::KeepAliveClosure { | |
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43 private: |
0 | 44 ParScanWeakRefClosure* _par_cl; |
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45 protected: |
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46 template <class T> void do_oop_work(T* p); |
0 | 47 public: |
48 ParKeepAliveClosure(ParScanWeakRefClosure* cl); | |
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49 virtual void do_oop(oop* p); |
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50 virtual void do_oop(narrowOop* p); |
0 | 51 }; |
52 | |
53 // The state needed by thread performing parallel young-gen collection. | |
54 class ParScanThreadState { | |
55 friend class ParScanThreadStateSet; | |
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56 private: |
0 | 57 ObjToScanQueue *_work_queue; |
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58 GrowableArray<oop>* _overflow_stack; |
0 | 59 |
60 ParGCAllocBuffer _to_space_alloc_buffer; | |
61 | |
62 ParScanWithoutBarrierClosure _to_space_closure; // scan_without_gc_barrier | |
63 ParScanWithBarrierClosure _old_gen_closure; // scan_with_gc_barrier | |
64 ParRootScanWithoutBarrierClosure _to_space_root_closure; // scan_root_without_gc_barrier | |
65 // One of these two will be passed to process_strong_roots, which will | |
66 // set its generation. The first is for two-gen configs where the | |
67 // old gen collects the perm gen; the second is for arbitrary configs. | |
68 // The second isn't used right now (it used to be used for the train, an | |
69 // incremental collector) but the declaration has been left as a reminder. | |
70 ParRootScanWithBarrierTwoGensClosure _older_gen_closure; | |
71 // This closure will always be bound to the old gen; it will be used | |
72 // in evacuate_followers. | |
73 ParRootScanWithBarrierTwoGensClosure _old_gen_root_closure; // scan_old_root_with_gc_barrier | |
74 ParEvacuateFollowersClosure _evacuate_followers; | |
75 DefNewGeneration::IsAliveClosure _is_alive_closure; | |
76 ParScanWeakRefClosure _scan_weak_ref_closure; | |
77 ParKeepAliveClosure _keep_alive_closure; | |
78 | |
79 | |
80 Space* _to_space; | |
81 Space* to_space() { return _to_space; } | |
82 | |
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83 ParNewGeneration* _young_gen; |
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84 ParNewGeneration* young_gen() const { return _young_gen; } |
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85 |
0 | 86 Generation* _old_gen; |
87 Generation* old_gen() { return _old_gen; } | |
88 | |
89 HeapWord *_young_old_boundary; | |
90 | |
91 int _hash_seed; | |
92 int _thread_num; | |
93 ageTable _ageTable; | |
94 | |
95 bool _to_space_full; | |
96 | |
97 int _pushes, _pops, _steals, _steal_attempts, _term_attempts; | |
98 int _overflow_pushes, _overflow_refills, _overflow_refill_objs; | |
99 | |
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100 // Stats for promotion failure |
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101 size_t _promotion_failure_size; |
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102 |
0 | 103 // Timing numbers. |
104 double _start; | |
105 double _start_strong_roots; | |
106 double _strong_roots_time; | |
107 double _start_term; | |
108 double _term_time; | |
109 | |
110 // Helper for trim_queues. Scans subset of an array and makes | |
111 // remainder available for work stealing. | |
112 void scan_partial_array_and_push_remainder(oop obj); | |
113 | |
114 // In support of CMS' parallel rescan of survivor space. | |
115 ChunkArray* _survivor_chunk_array; | |
116 ChunkArray* survivor_chunk_array() { return _survivor_chunk_array; } | |
117 | |
118 void record_survivor_plab(HeapWord* plab_start, size_t plab_word_size); | |
119 | |
120 ParScanThreadState(Space* to_space_, ParNewGeneration* gen_, | |
121 Generation* old_gen_, int thread_num_, | |
695 | 122 ObjToScanQueueSet* work_queue_set_, |
123 GrowableArray<oop>** overflow_stack_set_, | |
124 size_t desired_plab_sz_, | |
0 | 125 ParallelTaskTerminator& term_); |
126 | |
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127 public: |
0 | 128 ageTable* age_table() {return &_ageTable;} |
129 | |
130 ObjToScanQueue* work_queue() { return _work_queue; } | |
131 | |
132 ParGCAllocBuffer* to_space_alloc_buffer() { | |
133 return &_to_space_alloc_buffer; | |
134 } | |
135 | |
136 ParEvacuateFollowersClosure& evacuate_followers_closure() { return _evacuate_followers; } | |
137 DefNewGeneration::IsAliveClosure& is_alive_closure() { return _is_alive_closure; } | |
138 ParScanWeakRefClosure& scan_weak_ref_closure() { return _scan_weak_ref_closure; } | |
139 ParKeepAliveClosure& keep_alive_closure() { return _keep_alive_closure; } | |
140 ParScanClosure& older_gen_closure() { return _older_gen_closure; } | |
141 ParRootScanWithoutBarrierClosure& to_space_root_closure() { return _to_space_root_closure; }; | |
142 | |
143 // Decrease queue size below "max_size". | |
144 void trim_queues(int max_size); | |
145 | |
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146 // Private overflow stack usage |
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147 GrowableArray<oop>* overflow_stack() { return _overflow_stack; } |
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148 bool take_from_overflow_stack(); |
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149 void push_on_overflow_stack(oop p); |
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150 |
0 | 151 // Is new_obj a candidate for scan_partial_array_and_push_remainder method. |
152 inline bool should_be_partially_scanned(oop new_obj, oop old_obj) const; | |
153 | |
154 int* hash_seed() { return &_hash_seed; } | |
155 int thread_num() { return _thread_num; } | |
156 | |
157 // Allocate a to-space block of size "sz", or else return NULL. | |
158 HeapWord* alloc_in_to_space_slow(size_t word_sz); | |
159 | |
160 HeapWord* alloc_in_to_space(size_t word_sz) { | |
161 HeapWord* obj = to_space_alloc_buffer()->allocate(word_sz); | |
162 if (obj != NULL) return obj; | |
163 else return alloc_in_to_space_slow(word_sz); | |
164 } | |
165 | |
166 HeapWord* young_old_boundary() { return _young_old_boundary; } | |
167 | |
168 void set_young_old_boundary(HeapWord *boundary) { | |
169 _young_old_boundary = boundary; | |
170 } | |
171 | |
172 // Undo the most recent allocation ("obj", of "word_sz"). | |
173 void undo_alloc_in_to_space(HeapWord* obj, size_t word_sz); | |
174 | |
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175 // Promotion failure stats |
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176 size_t promotion_failure_size() { return promotion_failure_size(); } |
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177 void log_promotion_failure(size_t sz) { |
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178 if (_promotion_failure_size == 0) { |
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179 _promotion_failure_size = sz; |
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180 } |
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181 } |
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182 void print_and_clear_promotion_failure_size(); |
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183 |
0 | 184 int pushes() { return _pushes; } |
185 int pops() { return _pops; } | |
186 int steals() { return _steals; } | |
187 int steal_attempts() { return _steal_attempts; } | |
188 int term_attempts() { return _term_attempts; } | |
189 int overflow_pushes() { return _overflow_pushes; } | |
190 int overflow_refills() { return _overflow_refills; } | |
191 int overflow_refill_objs() { return _overflow_refill_objs; } | |
192 | |
193 void note_push() { if (PAR_STATS_ENABLED) _pushes++; } | |
194 void note_pop() { if (PAR_STATS_ENABLED) _pops++; } | |
195 void note_steal() { if (PAR_STATS_ENABLED) _steals++; } | |
196 void note_steal_attempt() { if (PAR_STATS_ENABLED) _steal_attempts++; } | |
197 void note_term_attempt() { if (PAR_STATS_ENABLED) _term_attempts++; } | |
198 void note_overflow_push() { if (PAR_STATS_ENABLED) _overflow_pushes++; } | |
199 void note_overflow_refill(int objs) { | |
200 if (PAR_STATS_ENABLED) { | |
201 _overflow_refills++; | |
202 _overflow_refill_objs += objs; | |
203 } | |
204 } | |
205 | |
206 void start_strong_roots() { | |
207 _start_strong_roots = os::elapsedTime(); | |
208 } | |
209 void end_strong_roots() { | |
210 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); | |
211 } | |
212 double strong_roots_time() { return _strong_roots_time; } | |
213 void start_term_time() { | |
214 note_term_attempt(); | |
215 _start_term = os::elapsedTime(); | |
216 } | |
217 void end_term_time() { | |
218 _term_time += (os::elapsedTime() - _start_term); | |
219 } | |
220 double term_time() { return _term_time; } | |
221 | |
222 double elapsed() { | |
223 return os::elapsedTime() - _start; | |
224 } | |
225 }; | |
226 | |
227 class ParNewGenTask: public AbstractGangTask { | |
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228 private: |
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229 ParNewGeneration* _gen; |
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230 Generation* _next_gen; |
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231 HeapWord* _young_old_boundary; |
0 | 232 class ParScanThreadStateSet* _state_set; |
233 | |
234 public: | |
235 ParNewGenTask(ParNewGeneration* gen, | |
236 Generation* next_gen, | |
237 HeapWord* young_old_boundary, | |
238 ParScanThreadStateSet* state_set); | |
239 | |
240 HeapWord* young_old_boundary() { return _young_old_boundary; } | |
241 | |
242 void work(int i); | |
243 }; | |
244 | |
245 class KeepAliveClosure: public DefNewGeneration::KeepAliveClosure { | |
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246 protected: |
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247 template <class T> void do_oop_work(T* p); |
0 | 248 public: |
249 KeepAliveClosure(ScanWeakRefClosure* cl); | |
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250 virtual void do_oop(oop* p); |
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251 virtual void do_oop(narrowOop* p); |
0 | 252 }; |
253 | |
254 class EvacuateFollowersClosureGeneral: public VoidClosure { | |
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255 private: |
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256 GenCollectedHeap* _gch; |
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257 int _level; |
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258 OopsInGenClosure* _scan_cur_or_nonheap; |
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259 OopsInGenClosure* _scan_older; |
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260 public: |
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261 EvacuateFollowersClosureGeneral(GenCollectedHeap* gch, int level, |
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262 OopsInGenClosure* cur, |
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263 OopsInGenClosure* older); |
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264 virtual void do_void(); |
0 | 265 }; |
266 | |
267 // Closure for scanning ParNewGeneration. | |
268 // Same as ScanClosure, except does parallel GC barrier. | |
269 class ScanClosureWithParBarrier: public ScanClosure { | |
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270 protected: |
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271 template <class T> void do_oop_work(T* p); |
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272 public: |
0 | 273 ScanClosureWithParBarrier(ParNewGeneration* g, bool gc_barrier); |
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274 virtual void do_oop(oop* p); |
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275 virtual void do_oop(narrowOop* p); |
0 | 276 }; |
277 | |
278 // Implements AbstractRefProcTaskExecutor for ParNew. | |
279 class ParNewRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
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280 private: |
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281 ParNewGeneration& _generation; |
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282 ParScanThreadStateSet& _state_set; |
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283 public: |
0 | 284 ParNewRefProcTaskExecutor(ParNewGeneration& generation, |
285 ParScanThreadStateSet& state_set) | |
286 : _generation(generation), _state_set(state_set) | |
287 { } | |
288 | |
289 // Executes a task using worker threads. | |
290 virtual void execute(ProcessTask& task); | |
291 virtual void execute(EnqueueTask& task); | |
292 // Switch to single threaded mode. | |
293 virtual void set_single_threaded_mode(); | |
294 }; | |
295 | |
296 | |
297 // A Generation that does parallel young-gen collection. | |
298 | |
299 class ParNewGeneration: public DefNewGeneration { | |
300 friend class ParNewGenTask; | |
301 friend class ParNewRefProcTask; | |
302 friend class ParNewRefProcTaskExecutor; | |
303 friend class ParScanThreadStateSet; | |
534 | 304 friend class ParEvacuateFollowersClosure; |
0 | 305 |
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306 private: |
0 | 307 // XXX use a global constant instead of 64! |
308 struct ObjToScanQueuePadded { | |
309 ObjToScanQueue work_queue; | |
310 char pad[64 - sizeof(ObjToScanQueue)]; // prevent false sharing | |
311 }; | |
312 | |
695 | 313 // The per-worker-thread work queues |
0 | 314 ObjToScanQueueSet* _task_queues; |
315 | |
695 | 316 // Per-worker-thread local overflow stacks |
317 GrowableArray<oop>** _overflow_stacks; | |
318 | |
0 | 319 // Desired size of survivor space plab's |
320 PLABStats _plab_stats; | |
321 | |
322 // A list of from-space images of to-be-scanned objects, threaded through | |
323 // klass-pointers (klass information already copied to the forwarded | |
324 // image.) Manipulated with CAS. | |
325 oop _overflow_list; | |
534 | 326 NOT_PRODUCT(ssize_t _num_par_pushes;) |
0 | 327 |
328 // If true, older generation does not support promotion undo, so avoid. | |
329 static bool _avoid_promotion_undo; | |
330 | |
331 // This closure is used by the reference processor to filter out | |
332 // references to live referent. | |
333 DefNewGeneration::IsAliveClosure _is_alive_closure; | |
334 | |
335 static oop real_forwardee_slow(oop obj); | |
336 static void waste_some_time(); | |
337 | |
338 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
339 // word being overwritten with a self-forwarding-pointer. | |
340 void preserve_mark_if_necessary(oop obj, markOop m); | |
341 | |
342 protected: | |
343 | |
344 bool _survivor_overflow; | |
345 | |
346 bool avoid_promotion_undo() { return _avoid_promotion_undo; } | |
347 void set_avoid_promotion_undo(bool v) { _avoid_promotion_undo = v; } | |
348 | |
349 bool survivor_overflow() { return _survivor_overflow; } | |
350 void set_survivor_overflow(bool v) { _survivor_overflow = v; } | |
351 | |
352 // Adjust the tenuring threshold. See the implementation for | |
353 // the details of the policy. | |
354 virtual void adjust_desired_tenuring_threshold(); | |
355 | |
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356 public: |
0 | 357 ParNewGeneration(ReservedSpace rs, size_t initial_byte_size, int level); |
358 | |
359 ~ParNewGeneration() { | |
360 for (uint i = 0; i < ParallelGCThreads; i++) | |
361 delete _task_queues->queue(i); | |
362 | |
363 delete _task_queues; | |
364 } | |
365 | |
366 virtual void ref_processor_init(); | |
367 virtual Generation::Name kind() { return Generation::ParNew; } | |
368 virtual const char* name() const; | |
369 virtual const char* short_name() const { return "ParNew"; } | |
370 | |
371 // override | |
372 virtual bool refs_discovery_is_mt() const { | |
373 assert(UseParNewGC, "ParNewGeneration only when UseParNewGC"); | |
374 return ParallelGCThreads > 1; | |
375 } | |
376 | |
377 // Make the collection virtual. | |
378 virtual void collect(bool full, | |
379 bool clear_all_soft_refs, | |
380 size_t size, | |
381 bool is_tlab); | |
382 | |
383 // This needs to be visible to the closure function. | |
384 // "obj" is the object to be copied, "m" is a recent value of its mark | |
385 // that must not contain a forwarding pointer (though one might be | |
386 // inserted in "obj"s mark word by a parallel thread). | |
387 inline oop copy_to_survivor_space(ParScanThreadState* par_scan_state, | |
388 oop obj, size_t obj_sz, markOop m) { | |
389 if (_avoid_promotion_undo) { | |
390 return copy_to_survivor_space_avoiding_promotion_undo(par_scan_state, | |
391 obj, obj_sz, m); | |
392 } | |
393 | |
394 return copy_to_survivor_space_with_undo(par_scan_state, obj, obj_sz, m); | |
395 } | |
396 | |
397 oop copy_to_survivor_space_avoiding_promotion_undo(ParScanThreadState* par_scan_state, | |
398 oop obj, size_t obj_sz, markOop m); | |
399 | |
400 oop copy_to_survivor_space_with_undo(ParScanThreadState* par_scan_state, | |
401 oop obj, size_t obj_sz, markOop m); | |
402 | |
534 | 403 // in support of testing overflow code |
404 NOT_PRODUCT(int _overflow_counter;) | |
405 NOT_PRODUCT(bool should_simulate_overflow();) | |
406 | |
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407 // Accessor for overflow list |
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408 oop overflow_list() { return _overflow_list; } |
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409 |
0 | 410 // Push the given (from-space) object on the global overflow list. |
534 | 411 void push_on_overflow_list(oop from_space_obj, ParScanThreadState* par_scan_state); |
0 | 412 |
413 // If the global overflow list is non-empty, move some tasks from it | |
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414 // onto "work_q" (which need not be empty). No more than 1/4 of the |
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415 // available space on "work_q" is used. |
0 | 416 bool take_from_overflow_list(ParScanThreadState* par_scan_state); |
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417 bool take_from_overflow_list_work(ParScanThreadState* par_scan_state); |
0 | 418 |
419 // The task queues to be used by parallel GC threads. | |
420 ObjToScanQueueSet* task_queues() { | |
421 return _task_queues; | |
422 } | |
423 | |
424 PLABStats* plab_stats() { | |
425 return &_plab_stats; | |
426 } | |
427 | |
428 size_t desired_plab_sz() { | |
429 return _plab_stats.desired_plab_sz(); | |
430 } | |
431 | |
432 static oop real_forwardee(oop obj); | |
433 | |
434 DEBUG_ONLY(static bool is_legal_forward_ptr(oop p);) | |
435 }; |