Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/parNew/parNewGeneration.hpp @ 679:cea947c8a988
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
Summary: When using compressed oops, rather than chaining the overflowed grey objects' pre-images through their klass words, we use GC-worker thread-local overflow stacks.
Reviewed-by: jcoomes, jmasa
author | ysr |
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date | Sat, 28 Mar 2009 15:47:29 -0700 |
parents | 0fbdb4381b99 |
children | becb17ad5e51 |
rev | line source |
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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 | |
36 typedef OopTaskQueue ObjToScanQueue; | |
37 typedef OopTaskQueueSet ObjToScanQueueSet; | |
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 | |
100 // Timing numbers. | |
101 double _start; | |
102 double _start_strong_roots; | |
103 double _strong_roots_time; | |
104 double _start_term; | |
105 double _term_time; | |
106 | |
107 // Helper for trim_queues. Scans subset of an array and makes | |
108 // remainder available for work stealing. | |
109 void scan_partial_array_and_push_remainder(oop obj); | |
110 | |
111 // In support of CMS' parallel rescan of survivor space. | |
112 ChunkArray* _survivor_chunk_array; | |
113 ChunkArray* survivor_chunk_array() { return _survivor_chunk_array; } | |
114 | |
115 void record_survivor_plab(HeapWord* plab_start, size_t plab_word_size); | |
116 | |
117 ParScanThreadState(Space* to_space_, ParNewGeneration* gen_, | |
118 Generation* old_gen_, int thread_num_, | |
119 ObjToScanQueueSet* work_queue_set_, size_t desired_plab_sz_, | |
120 ParallelTaskTerminator& term_); | |
121 | |
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122 public: |
0 | 123 ageTable* age_table() {return &_ageTable;} |
124 | |
125 ObjToScanQueue* work_queue() { return _work_queue; } | |
126 | |
127 ParGCAllocBuffer* to_space_alloc_buffer() { | |
128 return &_to_space_alloc_buffer; | |
129 } | |
130 | |
131 ParEvacuateFollowersClosure& evacuate_followers_closure() { return _evacuate_followers; } | |
132 DefNewGeneration::IsAliveClosure& is_alive_closure() { return _is_alive_closure; } | |
133 ParScanWeakRefClosure& scan_weak_ref_closure() { return _scan_weak_ref_closure; } | |
134 ParKeepAliveClosure& keep_alive_closure() { return _keep_alive_closure; } | |
135 ParScanClosure& older_gen_closure() { return _older_gen_closure; } | |
136 ParRootScanWithoutBarrierClosure& to_space_root_closure() { return _to_space_root_closure; }; | |
137 | |
138 // Decrease queue size below "max_size". | |
139 void trim_queues(int max_size); | |
140 | |
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141 // Private overflow stack usage |
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142 GrowableArray<oop>* overflow_stack() { return _overflow_stack; } |
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143 bool take_from_overflow_stack(); |
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144 void push_on_overflow_stack(oop p); |
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145 |
0 | 146 // Is new_obj a candidate for scan_partial_array_and_push_remainder method. |
147 inline bool should_be_partially_scanned(oop new_obj, oop old_obj) const; | |
148 | |
149 int* hash_seed() { return &_hash_seed; } | |
150 int thread_num() { return _thread_num; } | |
151 | |
152 // Allocate a to-space block of size "sz", or else return NULL. | |
153 HeapWord* alloc_in_to_space_slow(size_t word_sz); | |
154 | |
155 HeapWord* alloc_in_to_space(size_t word_sz) { | |
156 HeapWord* obj = to_space_alloc_buffer()->allocate(word_sz); | |
157 if (obj != NULL) return obj; | |
158 else return alloc_in_to_space_slow(word_sz); | |
159 } | |
160 | |
161 HeapWord* young_old_boundary() { return _young_old_boundary; } | |
162 | |
163 void set_young_old_boundary(HeapWord *boundary) { | |
164 _young_old_boundary = boundary; | |
165 } | |
166 | |
167 // Undo the most recent allocation ("obj", of "word_sz"). | |
168 void undo_alloc_in_to_space(HeapWord* obj, size_t word_sz); | |
169 | |
170 int pushes() { return _pushes; } | |
171 int pops() { return _pops; } | |
172 int steals() { return _steals; } | |
173 int steal_attempts() { return _steal_attempts; } | |
174 int term_attempts() { return _term_attempts; } | |
175 int overflow_pushes() { return _overflow_pushes; } | |
176 int overflow_refills() { return _overflow_refills; } | |
177 int overflow_refill_objs() { return _overflow_refill_objs; } | |
178 | |
179 void note_push() { if (PAR_STATS_ENABLED) _pushes++; } | |
180 void note_pop() { if (PAR_STATS_ENABLED) _pops++; } | |
181 void note_steal() { if (PAR_STATS_ENABLED) _steals++; } | |
182 void note_steal_attempt() { if (PAR_STATS_ENABLED) _steal_attempts++; } | |
183 void note_term_attempt() { if (PAR_STATS_ENABLED) _term_attempts++; } | |
184 void note_overflow_push() { if (PAR_STATS_ENABLED) _overflow_pushes++; } | |
185 void note_overflow_refill(int objs) { | |
186 if (PAR_STATS_ENABLED) { | |
187 _overflow_refills++; | |
188 _overflow_refill_objs += objs; | |
189 } | |
190 } | |
191 | |
192 void start_strong_roots() { | |
193 _start_strong_roots = os::elapsedTime(); | |
194 } | |
195 void end_strong_roots() { | |
196 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); | |
197 } | |
198 double strong_roots_time() { return _strong_roots_time; } | |
199 void start_term_time() { | |
200 note_term_attempt(); | |
201 _start_term = os::elapsedTime(); | |
202 } | |
203 void end_term_time() { | |
204 _term_time += (os::elapsedTime() - _start_term); | |
205 } | |
206 double term_time() { return _term_time; } | |
207 | |
208 double elapsed() { | |
209 return os::elapsedTime() - _start; | |
210 } | |
211 }; | |
212 | |
213 class ParNewGenTask: public AbstractGangTask { | |
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214 private: |
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215 ParNewGeneration* _gen; |
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216 Generation* _next_gen; |
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217 HeapWord* _young_old_boundary; |
0 | 218 class ParScanThreadStateSet* _state_set; |
219 | |
220 public: | |
221 ParNewGenTask(ParNewGeneration* gen, | |
222 Generation* next_gen, | |
223 HeapWord* young_old_boundary, | |
224 ParScanThreadStateSet* state_set); | |
225 | |
226 HeapWord* young_old_boundary() { return _young_old_boundary; } | |
227 | |
228 void work(int i); | |
229 }; | |
230 | |
231 class KeepAliveClosure: public DefNewGeneration::KeepAliveClosure { | |
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232 protected: |
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233 template <class T> void do_oop_work(T* p); |
0 | 234 public: |
235 KeepAliveClosure(ScanWeakRefClosure* cl); | |
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236 virtual void do_oop(oop* p); |
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237 virtual void do_oop(narrowOop* p); |
0 | 238 }; |
239 | |
240 class EvacuateFollowersClosureGeneral: public VoidClosure { | |
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241 private: |
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242 GenCollectedHeap* _gch; |
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243 int _level; |
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244 OopsInGenClosure* _scan_cur_or_nonheap; |
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245 OopsInGenClosure* _scan_older; |
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246 public: |
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247 EvacuateFollowersClosureGeneral(GenCollectedHeap* gch, int level, |
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248 OopsInGenClosure* cur, |
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249 OopsInGenClosure* older); |
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250 virtual void do_void(); |
0 | 251 }; |
252 | |
253 // Closure for scanning ParNewGeneration. | |
254 // Same as ScanClosure, except does parallel GC barrier. | |
255 class ScanClosureWithParBarrier: public ScanClosure { | |
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256 protected: |
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257 template <class T> void do_oop_work(T* p); |
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258 public: |
0 | 259 ScanClosureWithParBarrier(ParNewGeneration* g, bool gc_barrier); |
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260 virtual void do_oop(oop* p); |
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261 virtual void do_oop(narrowOop* p); |
0 | 262 }; |
263 | |
264 // Implements AbstractRefProcTaskExecutor for ParNew. | |
265 class ParNewRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
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266 private: |
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267 ParNewGeneration& _generation; |
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268 ParScanThreadStateSet& _state_set; |
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269 public: |
0 | 270 ParNewRefProcTaskExecutor(ParNewGeneration& generation, |
271 ParScanThreadStateSet& state_set) | |
272 : _generation(generation), _state_set(state_set) | |
273 { } | |
274 | |
275 // Executes a task using worker threads. | |
276 virtual void execute(ProcessTask& task); | |
277 virtual void execute(EnqueueTask& task); | |
278 // Switch to single threaded mode. | |
279 virtual void set_single_threaded_mode(); | |
280 }; | |
281 | |
282 | |
283 // A Generation that does parallel young-gen collection. | |
284 | |
285 class ParNewGeneration: public DefNewGeneration { | |
286 friend class ParNewGenTask; | |
287 friend class ParNewRefProcTask; | |
288 friend class ParNewRefProcTaskExecutor; | |
289 friend class ParScanThreadStateSet; | |
534 | 290 friend class ParEvacuateFollowersClosure; |
0 | 291 |
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292 private: |
0 | 293 // XXX use a global constant instead of 64! |
294 struct ObjToScanQueuePadded { | |
295 ObjToScanQueue work_queue; | |
296 char pad[64 - sizeof(ObjToScanQueue)]; // prevent false sharing | |
297 }; | |
298 | |
299 // The per-thread work queues, available here for stealing. | |
300 ObjToScanQueueSet* _task_queues; | |
301 | |
302 // Desired size of survivor space plab's | |
303 PLABStats _plab_stats; | |
304 | |
305 // A list of from-space images of to-be-scanned objects, threaded through | |
306 // klass-pointers (klass information already copied to the forwarded | |
307 // image.) Manipulated with CAS. | |
308 oop _overflow_list; | |
534 | 309 NOT_PRODUCT(ssize_t _num_par_pushes;) |
0 | 310 |
311 // If true, older generation does not support promotion undo, so avoid. | |
312 static bool _avoid_promotion_undo; | |
313 | |
314 // This closure is used by the reference processor to filter out | |
315 // references to live referent. | |
316 DefNewGeneration::IsAliveClosure _is_alive_closure; | |
317 | |
318 static oop real_forwardee_slow(oop obj); | |
319 static void waste_some_time(); | |
320 | |
321 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
322 // word being overwritten with a self-forwarding-pointer. | |
323 void preserve_mark_if_necessary(oop obj, markOop m); | |
324 | |
325 protected: | |
326 | |
327 bool _survivor_overflow; | |
328 | |
329 bool avoid_promotion_undo() { return _avoid_promotion_undo; } | |
330 void set_avoid_promotion_undo(bool v) { _avoid_promotion_undo = v; } | |
331 | |
332 bool survivor_overflow() { return _survivor_overflow; } | |
333 void set_survivor_overflow(bool v) { _survivor_overflow = v; } | |
334 | |
335 // Adjust the tenuring threshold. See the implementation for | |
336 // the details of the policy. | |
337 virtual void adjust_desired_tenuring_threshold(); | |
338 | |
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339 public: |
0 | 340 ParNewGeneration(ReservedSpace rs, size_t initial_byte_size, int level); |
341 | |
342 ~ParNewGeneration() { | |
343 for (uint i = 0; i < ParallelGCThreads; i++) | |
344 delete _task_queues->queue(i); | |
345 | |
346 delete _task_queues; | |
347 } | |
348 | |
349 virtual void ref_processor_init(); | |
350 virtual Generation::Name kind() { return Generation::ParNew; } | |
351 virtual const char* name() const; | |
352 virtual const char* short_name() const { return "ParNew"; } | |
353 | |
354 // override | |
355 virtual bool refs_discovery_is_mt() const { | |
356 assert(UseParNewGC, "ParNewGeneration only when UseParNewGC"); | |
357 return ParallelGCThreads > 1; | |
358 } | |
359 | |
360 // Make the collection virtual. | |
361 virtual void collect(bool full, | |
362 bool clear_all_soft_refs, | |
363 size_t size, | |
364 bool is_tlab); | |
365 | |
366 // This needs to be visible to the closure function. | |
367 // "obj" is the object to be copied, "m" is a recent value of its mark | |
368 // that must not contain a forwarding pointer (though one might be | |
369 // inserted in "obj"s mark word by a parallel thread). | |
370 inline oop copy_to_survivor_space(ParScanThreadState* par_scan_state, | |
371 oop obj, size_t obj_sz, markOop m) { | |
372 if (_avoid_promotion_undo) { | |
373 return copy_to_survivor_space_avoiding_promotion_undo(par_scan_state, | |
374 obj, obj_sz, m); | |
375 } | |
376 | |
377 return copy_to_survivor_space_with_undo(par_scan_state, obj, obj_sz, m); | |
378 } | |
379 | |
380 oop copy_to_survivor_space_avoiding_promotion_undo(ParScanThreadState* par_scan_state, | |
381 oop obj, size_t obj_sz, markOop m); | |
382 | |
383 oop copy_to_survivor_space_with_undo(ParScanThreadState* par_scan_state, | |
384 oop obj, size_t obj_sz, markOop m); | |
385 | |
534 | 386 // in support of testing overflow code |
387 NOT_PRODUCT(int _overflow_counter;) | |
388 NOT_PRODUCT(bool should_simulate_overflow();) | |
389 | |
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390 // Accessor for overflow list |
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391 oop overflow_list() { return _overflow_list; } |
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392 |
0 | 393 // Push the given (from-space) object on the global overflow list. |
534 | 394 void push_on_overflow_list(oop from_space_obj, ParScanThreadState* par_scan_state); |
0 | 395 |
396 // If the global overflow list is non-empty, move some tasks from it | |
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397 // onto "work_q" (which need not be empty). No more than 1/4 of the |
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398 // available space on "work_q" is used. |
0 | 399 bool take_from_overflow_list(ParScanThreadState* par_scan_state); |
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400 bool take_from_overflow_list_work(ParScanThreadState* par_scan_state); |
0 | 401 |
402 // The task queues to be used by parallel GC threads. | |
403 ObjToScanQueueSet* task_queues() { | |
404 return _task_queues; | |
405 } | |
406 | |
407 PLABStats* plab_stats() { | |
408 return &_plab_stats; | |
409 } | |
410 | |
411 size_t desired_plab_sz() { | |
412 return _plab_stats.desired_plab_sz(); | |
413 } | |
414 | |
415 static oop real_forwardee(oop obj); | |
416 | |
417 DEBUG_ONLY(static bool is_legal_forward_ptr(oop p);) | |
418 }; |