Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parNew/parNewGeneration.hpp @ 11060:068b406e307f
7060111: race condition in VMError::report_and_die()
Reviewed-by: zgu, coleenp
Contributed-by: volker.simonis@gmail.com
author | fparain |
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date | Mon, 01 Jul 2013 09:13:19 +0000 |
parents | f2110083203d |
children | 9766f73e770d |
rev | line source |
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0 | 1 /* |
6595 | 2 * Copyright (c) 2001, 2012, 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 * | |
1552
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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_PARNEW_PARNEWGENERATION_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARNEW_PARNEWGENERATION_HPP | |
27 | |
10405 | 28 #include "gc_implementation/shared/gcTrace.hpp" |
6595 | 29 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
10405 | 30 #include "gc_implementation/shared/copyFailedInfo.hpp" |
1972 | 31 #include "memory/defNewGeneration.hpp" |
32 #include "utilities/taskqueue.hpp" | |
33 | |
0 | 34 class ChunkArray; |
35 class ParScanWithoutBarrierClosure; | |
36 class ParScanWithBarrierClosure; | |
37 class ParRootScanWithoutBarrierClosure; | |
38 class ParRootScanWithBarrierTwoGensClosure; | |
39 class ParEvacuateFollowersClosure; | |
40 | |
41 // It would be better if these types could be kept local to the .cpp file, | |
42 // but they must be here to allow ParScanClosure::do_oop_work to be defined | |
43 // in genOopClosures.inline.hpp. | |
44 | |
1665 | 45 typedef Padded<OopTaskQueue> ObjToScanQueue; |
6197 | 46 typedef GenericTaskQueueSet<ObjToScanQueue, mtGC> ObjToScanQueueSet; |
0 | 47 |
48 class ParKeepAliveClosure: public DefNewGeneration::KeepAliveClosure { | |
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49 private: |
0 | 50 ParScanWeakRefClosure* _par_cl; |
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51 protected: |
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52 template <class T> void do_oop_work(T* p); |
0 | 53 public: |
54 ParKeepAliveClosure(ParScanWeakRefClosure* cl); | |
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55 virtual void do_oop(oop* p); |
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56 virtual void do_oop(narrowOop* p); |
0 | 57 }; |
58 | |
59 // The state needed by thread performing parallel young-gen collection. | |
60 class ParScanThreadState { | |
61 friend class ParScanThreadStateSet; | |
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62 private: |
0 | 63 ObjToScanQueue *_work_queue; |
6197 | 64 Stack<oop, mtGC>* const _overflow_stack; |
0 | 65 |
66 ParGCAllocBuffer _to_space_alloc_buffer; | |
67 | |
68 ParScanWithoutBarrierClosure _to_space_closure; // scan_without_gc_barrier | |
69 ParScanWithBarrierClosure _old_gen_closure; // scan_with_gc_barrier | |
70 ParRootScanWithoutBarrierClosure _to_space_root_closure; // scan_root_without_gc_barrier | |
71 // One of these two will be passed to process_strong_roots, which will | |
72 // set its generation. The first is for two-gen configs where the | |
73 // old gen collects the perm gen; the second is for arbitrary configs. | |
74 // The second isn't used right now (it used to be used for the train, an | |
75 // incremental collector) but the declaration has been left as a reminder. | |
76 ParRootScanWithBarrierTwoGensClosure _older_gen_closure; | |
77 // This closure will always be bound to the old gen; it will be used | |
78 // in evacuate_followers. | |
79 ParRootScanWithBarrierTwoGensClosure _old_gen_root_closure; // scan_old_root_with_gc_barrier | |
80 ParEvacuateFollowersClosure _evacuate_followers; | |
81 DefNewGeneration::IsAliveClosure _is_alive_closure; | |
82 ParScanWeakRefClosure _scan_weak_ref_closure; | |
83 ParKeepAliveClosure _keep_alive_closure; | |
84 | |
85 | |
86 Space* _to_space; | |
87 Space* to_space() { return _to_space; } | |
88 | |
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89 ParNewGeneration* _young_gen; |
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90 ParNewGeneration* young_gen() const { return _young_gen; } |
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91 |
0 | 92 Generation* _old_gen; |
93 Generation* old_gen() { return _old_gen; } | |
94 | |
95 HeapWord *_young_old_boundary; | |
96 | |
97 int _hash_seed; | |
98 int _thread_num; | |
99 ageTable _ageTable; | |
100 | |
101 bool _to_space_full; | |
102 | |
1710 | 103 #if TASKQUEUE_STATS |
104 size_t _term_attempts; | |
105 size_t _overflow_refills; | |
106 size_t _overflow_refill_objs; | |
107 #endif // TASKQUEUE_STATS | |
0 | 108 |
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109 // Stats for promotion failure |
10405 | 110 PromotionFailedInfo _promotion_failed_info; |
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111 |
0 | 112 // Timing numbers. |
113 double _start; | |
114 double _start_strong_roots; | |
115 double _strong_roots_time; | |
116 double _start_term; | |
117 double _term_time; | |
118 | |
119 // Helper for trim_queues. Scans subset of an array and makes | |
120 // remainder available for work stealing. | |
121 void scan_partial_array_and_push_remainder(oop obj); | |
122 | |
123 // In support of CMS' parallel rescan of survivor space. | |
124 ChunkArray* _survivor_chunk_array; | |
125 ChunkArray* survivor_chunk_array() { return _survivor_chunk_array; } | |
126 | |
127 void record_survivor_plab(HeapWord* plab_start, size_t plab_word_size); | |
128 | |
129 ParScanThreadState(Space* to_space_, ParNewGeneration* gen_, | |
130 Generation* old_gen_, int thread_num_, | |
695 | 131 ObjToScanQueueSet* work_queue_set_, |
6197 | 132 Stack<oop, mtGC>* overflow_stacks_, |
695 | 133 size_t desired_plab_sz_, |
0 | 134 ParallelTaskTerminator& term_); |
135 | |
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136 public: |
0 | 137 ageTable* age_table() {return &_ageTable;} |
138 | |
139 ObjToScanQueue* work_queue() { return _work_queue; } | |
140 | |
141 ParGCAllocBuffer* to_space_alloc_buffer() { | |
142 return &_to_space_alloc_buffer; | |
143 } | |
144 | |
145 ParEvacuateFollowersClosure& evacuate_followers_closure() { return _evacuate_followers; } | |
146 DefNewGeneration::IsAliveClosure& is_alive_closure() { return _is_alive_closure; } | |
147 ParScanWeakRefClosure& scan_weak_ref_closure() { return _scan_weak_ref_closure; } | |
148 ParKeepAliveClosure& keep_alive_closure() { return _keep_alive_closure; } | |
149 ParScanClosure& older_gen_closure() { return _older_gen_closure; } | |
150 ParRootScanWithoutBarrierClosure& to_space_root_closure() { return _to_space_root_closure; }; | |
151 | |
152 // Decrease queue size below "max_size". | |
153 void trim_queues(int max_size); | |
154 | |
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155 // Private overflow stack usage |
6197 | 156 Stack<oop, mtGC>* overflow_stack() { return _overflow_stack; } |
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157 bool take_from_overflow_stack(); |
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158 void push_on_overflow_stack(oop p); |
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159 |
0 | 160 // Is new_obj a candidate for scan_partial_array_and_push_remainder method. |
161 inline bool should_be_partially_scanned(oop new_obj, oop old_obj) const; | |
162 | |
163 int* hash_seed() { return &_hash_seed; } | |
164 int thread_num() { return _thread_num; } | |
165 | |
166 // Allocate a to-space block of size "sz", or else return NULL. | |
167 HeapWord* alloc_in_to_space_slow(size_t word_sz); | |
168 | |
169 HeapWord* alloc_in_to_space(size_t word_sz) { | |
170 HeapWord* obj = to_space_alloc_buffer()->allocate(word_sz); | |
171 if (obj != NULL) return obj; | |
172 else return alloc_in_to_space_slow(word_sz); | |
173 } | |
174 | |
175 HeapWord* young_old_boundary() { return _young_old_boundary; } | |
176 | |
177 void set_young_old_boundary(HeapWord *boundary) { | |
178 _young_old_boundary = boundary; | |
179 } | |
180 | |
181 // Undo the most recent allocation ("obj", of "word_sz"). | |
182 void undo_alloc_in_to_space(HeapWord* obj, size_t word_sz); | |
183 | |
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184 // Promotion failure stats |
10405 | 185 void register_promotion_failure(size_t sz) { |
186 _promotion_failed_info.register_copy_failure(sz); | |
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187 } |
10405 | 188 PromotionFailedInfo& promotion_failed_info() { |
189 return _promotion_failed_info; | |
190 } | |
191 bool promotion_failed() { | |
192 return _promotion_failed_info.has_failed(); | |
193 } | |
194 void print_promotion_failure_size(); | |
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195 |
1710 | 196 #if TASKQUEUE_STATS |
197 TaskQueueStats & taskqueue_stats() const { return _work_queue->stats; } | |
198 | |
199 size_t term_attempts() const { return _term_attempts; } | |
200 size_t overflow_refills() const { return _overflow_refills; } | |
201 size_t overflow_refill_objs() const { return _overflow_refill_objs; } | |
0 | 202 |
1710 | 203 void note_term_attempt() { ++_term_attempts; } |
204 void note_overflow_refill(size_t objs) { | |
205 ++_overflow_refills; _overflow_refill_objs += objs; | |
0 | 206 } |
207 | |
1710 | 208 void reset_stats(); |
209 #endif // TASKQUEUE_STATS | |
210 | |
0 | 211 void start_strong_roots() { |
212 _start_strong_roots = os::elapsedTime(); | |
213 } | |
214 void end_strong_roots() { | |
215 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); | |
216 } | |
1710 | 217 double strong_roots_time() const { return _strong_roots_time; } |
0 | 218 void start_term_time() { |
1710 | 219 TASKQUEUE_STATS_ONLY(note_term_attempt()); |
0 | 220 _start_term = os::elapsedTime(); |
221 } | |
222 void end_term_time() { | |
223 _term_time += (os::elapsedTime() - _start_term); | |
224 } | |
1710 | 225 double term_time() const { return _term_time; } |
0 | 226 |
1710 | 227 double elapsed_time() const { |
0 | 228 return os::elapsedTime() - _start; |
229 } | |
230 }; | |
231 | |
232 class ParNewGenTask: public AbstractGangTask { | |
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233 private: |
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234 ParNewGeneration* _gen; |
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235 Generation* _next_gen; |
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236 HeapWord* _young_old_boundary; |
0 | 237 class ParScanThreadStateSet* _state_set; |
238 | |
239 public: | |
240 ParNewGenTask(ParNewGeneration* gen, | |
241 Generation* next_gen, | |
242 HeapWord* young_old_boundary, | |
243 ParScanThreadStateSet* state_set); | |
244 | |
245 HeapWord* young_old_boundary() { return _young_old_boundary; } | |
246 | |
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247 void work(uint worker_id); |
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248 |
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249 // Reset the terminator in ParScanThreadStateSet for |
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250 // "active_workers" threads. |
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251 virtual void set_for_termination(int active_workers); |
0 | 252 }; |
253 | |
254 class KeepAliveClosure: public DefNewGeneration::KeepAliveClosure { | |
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255 protected: |
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256 template <class T> void do_oop_work(T* p); |
0 | 257 public: |
258 KeepAliveClosure(ScanWeakRefClosure* cl); | |
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259 virtual void do_oop(oop* p); |
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260 virtual void do_oop(narrowOop* p); |
0 | 261 }; |
262 | |
263 class EvacuateFollowersClosureGeneral: public VoidClosure { | |
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264 private: |
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265 GenCollectedHeap* _gch; |
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266 int _level; |
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267 OopsInGenClosure* _scan_cur_or_nonheap; |
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268 OopsInGenClosure* _scan_older; |
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269 public: |
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270 EvacuateFollowersClosureGeneral(GenCollectedHeap* gch, int level, |
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271 OopsInGenClosure* cur, |
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272 OopsInGenClosure* older); |
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273 virtual void do_void(); |
0 | 274 }; |
275 | |
276 // Closure for scanning ParNewGeneration. | |
277 // Same as ScanClosure, except does parallel GC barrier. | |
278 class ScanClosureWithParBarrier: public ScanClosure { | |
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279 protected: |
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280 template <class T> void do_oop_work(T* p); |
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281 public: |
0 | 282 ScanClosureWithParBarrier(ParNewGeneration* g, bool gc_barrier); |
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283 virtual void do_oop(oop* p); |
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284 virtual void do_oop(narrowOop* p); |
0 | 285 }; |
286 | |
287 // Implements AbstractRefProcTaskExecutor for ParNew. | |
288 class ParNewRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
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289 private: |
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290 ParNewGeneration& _generation; |
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291 ParScanThreadStateSet& _state_set; |
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292 public: |
0 | 293 ParNewRefProcTaskExecutor(ParNewGeneration& generation, |
294 ParScanThreadStateSet& state_set) | |
295 : _generation(generation), _state_set(state_set) | |
296 { } | |
297 | |
298 // Executes a task using worker threads. | |
299 virtual void execute(ProcessTask& task); | |
300 virtual void execute(EnqueueTask& task); | |
301 // Switch to single threaded mode. | |
302 virtual void set_single_threaded_mode(); | |
303 }; | |
304 | |
305 | |
306 // A Generation that does parallel young-gen collection. | |
307 | |
308 class ParNewGeneration: public DefNewGeneration { | |
309 friend class ParNewGenTask; | |
310 friend class ParNewRefProcTask; | |
311 friend class ParNewRefProcTaskExecutor; | |
312 friend class ParScanThreadStateSet; | |
534 | 313 friend class ParEvacuateFollowersClosure; |
0 | 314 |
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315 private: |
695 | 316 // The per-worker-thread work queues |
0 | 317 ObjToScanQueueSet* _task_queues; |
318 | |
695 | 319 // Per-worker-thread local overflow stacks |
6197 | 320 Stack<oop, mtGC>* _overflow_stacks; |
695 | 321 |
0 | 322 // Desired size of survivor space plab's |
323 PLABStats _plab_stats; | |
324 | |
325 // A list of from-space images of to-be-scanned objects, threaded through | |
326 // klass-pointers (klass information already copied to the forwarded | |
327 // image.) Manipulated with CAS. | |
328 oop _overflow_list; | |
534 | 329 NOT_PRODUCT(ssize_t _num_par_pushes;) |
0 | 330 |
331 // If true, older generation does not support promotion undo, so avoid. | |
332 static bool _avoid_promotion_undo; | |
333 | |
334 // This closure is used by the reference processor to filter out | |
335 // references to live referent. | |
336 DefNewGeneration::IsAliveClosure _is_alive_closure; | |
337 | |
338 static oop real_forwardee_slow(oop obj); | |
339 static void waste_some_time(); | |
340 | |
341 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
342 // word being overwritten with a self-forwarding-pointer. | |
343 void preserve_mark_if_necessary(oop obj, markOop m); | |
344 | |
10405 | 345 void handle_promotion_failed(GenCollectedHeap* gch, ParScanThreadStateSet& thread_state_set, ParNewTracer& gc_tracer); |
346 | |
0 | 347 protected: |
348 | |
349 bool _survivor_overflow; | |
350 | |
351 bool avoid_promotion_undo() { return _avoid_promotion_undo; } | |
352 void set_avoid_promotion_undo(bool v) { _avoid_promotion_undo = v; } | |
353 | |
354 bool survivor_overflow() { return _survivor_overflow; } | |
355 void set_survivor_overflow(bool v) { _survivor_overflow = v; } | |
356 | |
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357 public: |
0 | 358 ParNewGeneration(ReservedSpace rs, size_t initial_byte_size, int level); |
359 | |
360 ~ParNewGeneration() { | |
361 for (uint i = 0; i < ParallelGCThreads; i++) | |
362 delete _task_queues->queue(i); | |
363 | |
364 delete _task_queues; | |
365 } | |
366 | |
367 virtual void ref_processor_init(); | |
368 virtual Generation::Name kind() { return Generation::ParNew; } | |
369 virtual const char* name() const; | |
370 virtual const char* short_name() const { return "ParNew"; } | |
371 | |
372 // override | |
373 virtual bool refs_discovery_is_mt() const { | |
374 assert(UseParNewGC, "ParNewGeneration only when UseParNewGC"); | |
375 return ParallelGCThreads > 1; | |
376 } | |
377 | |
378 // Make the collection virtual. | |
379 virtual void collect(bool full, | |
380 bool clear_all_soft_refs, | |
381 size_t size, | |
382 bool is_tlab); | |
383 | |
384 // This needs to be visible to the closure function. | |
385 // "obj" is the object to be copied, "m" is a recent value of its mark | |
386 // that must not contain a forwarding pointer (though one might be | |
387 // inserted in "obj"s mark word by a parallel thread). | |
388 inline oop copy_to_survivor_space(ParScanThreadState* par_scan_state, | |
389 oop obj, size_t obj_sz, markOop m) { | |
390 if (_avoid_promotion_undo) { | |
391 return copy_to_survivor_space_avoiding_promotion_undo(par_scan_state, | |
392 obj, obj_sz, m); | |
393 } | |
394 | |
395 return copy_to_survivor_space_with_undo(par_scan_state, obj, obj_sz, m); | |
396 } | |
397 | |
398 oop copy_to_survivor_space_avoiding_promotion_undo(ParScanThreadState* par_scan_state, | |
399 oop obj, size_t obj_sz, markOop m); | |
400 | |
401 oop copy_to_survivor_space_with_undo(ParScanThreadState* par_scan_state, | |
402 oop obj, size_t obj_sz, markOop m); | |
403 | |
534 | 404 // in support of testing overflow code |
405 NOT_PRODUCT(int _overflow_counter;) | |
406 NOT_PRODUCT(bool should_simulate_overflow();) | |
407 | |
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408 // Accessor for overflow list |
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409 oop overflow_list() { return _overflow_list; } |
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410 |
0 | 411 // Push the given (from-space) object on the global overflow list. |
534 | 412 void push_on_overflow_list(oop from_space_obj, ParScanThreadState* par_scan_state); |
0 | 413 |
414 // If the global overflow list is non-empty, move some tasks from it | |
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415 // onto "work_q" (which need not be empty). No more than 1/4 of the |
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416 // available space on "work_q" is used. |
0 | 417 bool take_from_overflow_list(ParScanThreadState* par_scan_state); |
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418 bool take_from_overflow_list_work(ParScanThreadState* par_scan_state); |
0 | 419 |
420 // The task queues to be used by parallel GC threads. | |
421 ObjToScanQueueSet* task_queues() { | |
422 return _task_queues; | |
423 } | |
424 | |
425 PLABStats* plab_stats() { | |
426 return &_plab_stats; | |
427 } | |
428 | |
429 size_t desired_plab_sz() { | |
430 return _plab_stats.desired_plab_sz(); | |
431 } | |
432 | |
433 static oop real_forwardee(oop obj); | |
434 | |
435 DEBUG_ONLY(static bool is_legal_forward_ptr(oop p);) | |
436 }; | |
1972 | 437 |
438 #endif // SHARE_VM_GC_IMPLEMENTATION_PARNEW_PARNEWGENERATION_HPP |