Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parNew/parNewGeneration.hpp @ 12885:8df6f123d35e
8026124: JSR-292 bug: java.nio.file.Path.toString cores dump
Summary: catch problem case, assert it matches valid input, new test
Reviewed-by: jrose, twisti, kvn
author | drchase |
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date | Sat, 12 Oct 2013 17:26:41 -0400 |
parents | 9766f73e770d |
children | 2c6ef90f030a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 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_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" |
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32 #include "memory/padded.hpp" |
1972 | 33 #include "utilities/taskqueue.hpp" |
34 | |
0 | 35 class ChunkArray; |
36 class ParScanWithoutBarrierClosure; | |
37 class ParScanWithBarrierClosure; | |
38 class ParRootScanWithoutBarrierClosure; | |
39 class ParRootScanWithBarrierTwoGensClosure; | |
40 class ParEvacuateFollowersClosure; | |
41 | |
42 // It would be better if these types could be kept local to the .cpp file, | |
43 // but they must be here to allow ParScanClosure::do_oop_work to be defined | |
44 // in genOopClosures.inline.hpp. | |
45 | |
1665 | 46 typedef Padded<OopTaskQueue> ObjToScanQueue; |
6197 | 47 typedef GenericTaskQueueSet<ObjToScanQueue, mtGC> ObjToScanQueueSet; |
0 | 48 |
49 class ParKeepAliveClosure: public DefNewGeneration::KeepAliveClosure { | |
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50 private: |
0 | 51 ParScanWeakRefClosure* _par_cl; |
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52 protected: |
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53 template <class T> void do_oop_work(T* p); |
0 | 54 public: |
55 ParKeepAliveClosure(ParScanWeakRefClosure* cl); | |
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56 virtual void do_oop(oop* p); |
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57 virtual void do_oop(narrowOop* p); |
0 | 58 }; |
59 | |
60 // The state needed by thread performing parallel young-gen collection. | |
61 class ParScanThreadState { | |
62 friend class ParScanThreadStateSet; | |
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63 private: |
0 | 64 ObjToScanQueue *_work_queue; |
6197 | 65 Stack<oop, mtGC>* const _overflow_stack; |
0 | 66 |
67 ParGCAllocBuffer _to_space_alloc_buffer; | |
68 | |
69 ParScanWithoutBarrierClosure _to_space_closure; // scan_without_gc_barrier | |
70 ParScanWithBarrierClosure _old_gen_closure; // scan_with_gc_barrier | |
71 ParRootScanWithoutBarrierClosure _to_space_root_closure; // scan_root_without_gc_barrier | |
72 // One of these two will be passed to process_strong_roots, which will | |
73 // set its generation. The first is for two-gen configs where the | |
74 // old gen collects the perm gen; the second is for arbitrary configs. | |
75 // The second isn't used right now (it used to be used for the train, an | |
76 // incremental collector) but the declaration has been left as a reminder. | |
77 ParRootScanWithBarrierTwoGensClosure _older_gen_closure; | |
78 // This closure will always be bound to the old gen; it will be used | |
79 // in evacuate_followers. | |
80 ParRootScanWithBarrierTwoGensClosure _old_gen_root_closure; // scan_old_root_with_gc_barrier | |
81 ParEvacuateFollowersClosure _evacuate_followers; | |
82 DefNewGeneration::IsAliveClosure _is_alive_closure; | |
83 ParScanWeakRefClosure _scan_weak_ref_closure; | |
84 ParKeepAliveClosure _keep_alive_closure; | |
85 | |
86 | |
87 Space* _to_space; | |
88 Space* to_space() { return _to_space; } | |
89 | |
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90 ParNewGeneration* _young_gen; |
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91 ParNewGeneration* young_gen() const { return _young_gen; } |
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92 |
0 | 93 Generation* _old_gen; |
94 Generation* old_gen() { return _old_gen; } | |
95 | |
96 HeapWord *_young_old_boundary; | |
97 | |
98 int _hash_seed; | |
99 int _thread_num; | |
100 ageTable _ageTable; | |
101 | |
102 bool _to_space_full; | |
103 | |
1710 | 104 #if TASKQUEUE_STATS |
105 size_t _term_attempts; | |
106 size_t _overflow_refills; | |
107 size_t _overflow_refill_objs; | |
108 #endif // TASKQUEUE_STATS | |
0 | 109 |
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110 // Stats for promotion failure |
10405 | 111 PromotionFailedInfo _promotion_failed_info; |
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112 |
0 | 113 // Timing numbers. |
114 double _start; | |
115 double _start_strong_roots; | |
116 double _strong_roots_time; | |
117 double _start_term; | |
118 double _term_time; | |
119 | |
120 // Helper for trim_queues. Scans subset of an array and makes | |
121 // remainder available for work stealing. | |
122 void scan_partial_array_and_push_remainder(oop obj); | |
123 | |
124 // In support of CMS' parallel rescan of survivor space. | |
125 ChunkArray* _survivor_chunk_array; | |
126 ChunkArray* survivor_chunk_array() { return _survivor_chunk_array; } | |
127 | |
128 void record_survivor_plab(HeapWord* plab_start, size_t plab_word_size); | |
129 | |
130 ParScanThreadState(Space* to_space_, ParNewGeneration* gen_, | |
131 Generation* old_gen_, int thread_num_, | |
695 | 132 ObjToScanQueueSet* work_queue_set_, |
6197 | 133 Stack<oop, mtGC>* overflow_stacks_, |
695 | 134 size_t desired_plab_sz_, |
0 | 135 ParallelTaskTerminator& term_); |
136 | |
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137 public: |
0 | 138 ageTable* age_table() {return &_ageTable;} |
139 | |
140 ObjToScanQueue* work_queue() { return _work_queue; } | |
141 | |
142 ParGCAllocBuffer* to_space_alloc_buffer() { | |
143 return &_to_space_alloc_buffer; | |
144 } | |
145 | |
146 ParEvacuateFollowersClosure& evacuate_followers_closure() { return _evacuate_followers; } | |
147 DefNewGeneration::IsAliveClosure& is_alive_closure() { return _is_alive_closure; } | |
148 ParScanWeakRefClosure& scan_weak_ref_closure() { return _scan_weak_ref_closure; } | |
149 ParKeepAliveClosure& keep_alive_closure() { return _keep_alive_closure; } | |
150 ParScanClosure& older_gen_closure() { return _older_gen_closure; } | |
151 ParRootScanWithoutBarrierClosure& to_space_root_closure() { return _to_space_root_closure; }; | |
152 | |
153 // Decrease queue size below "max_size". | |
154 void trim_queues(int max_size); | |
155 | |
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156 // Private overflow stack usage |
6197 | 157 Stack<oop, mtGC>* overflow_stack() { return _overflow_stack; } |
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158 bool take_from_overflow_stack(); |
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159 void push_on_overflow_stack(oop p); |
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160 |
0 | 161 // Is new_obj a candidate for scan_partial_array_and_push_remainder method. |
162 inline bool should_be_partially_scanned(oop new_obj, oop old_obj) const; | |
163 | |
164 int* hash_seed() { return &_hash_seed; } | |
165 int thread_num() { return _thread_num; } | |
166 | |
167 // Allocate a to-space block of size "sz", or else return NULL. | |
168 HeapWord* alloc_in_to_space_slow(size_t word_sz); | |
169 | |
170 HeapWord* alloc_in_to_space(size_t word_sz) { | |
171 HeapWord* obj = to_space_alloc_buffer()->allocate(word_sz); | |
172 if (obj != NULL) return obj; | |
173 else return alloc_in_to_space_slow(word_sz); | |
174 } | |
175 | |
176 HeapWord* young_old_boundary() { return _young_old_boundary; } | |
177 | |
178 void set_young_old_boundary(HeapWord *boundary) { | |
179 _young_old_boundary = boundary; | |
180 } | |
181 | |
182 // Undo the most recent allocation ("obj", of "word_sz"). | |
183 void undo_alloc_in_to_space(HeapWord* obj, size_t word_sz); | |
184 | |
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185 // Promotion failure stats |
10405 | 186 void register_promotion_failure(size_t sz) { |
187 _promotion_failed_info.register_copy_failure(sz); | |
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188 } |
10405 | 189 PromotionFailedInfo& promotion_failed_info() { |
190 return _promotion_failed_info; | |
191 } | |
192 bool promotion_failed() { | |
193 return _promotion_failed_info.has_failed(); | |
194 } | |
195 void print_promotion_failure_size(); | |
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196 |
1710 | 197 #if TASKQUEUE_STATS |
198 TaskQueueStats & taskqueue_stats() const { return _work_queue->stats; } | |
199 | |
200 size_t term_attempts() const { return _term_attempts; } | |
201 size_t overflow_refills() const { return _overflow_refills; } | |
202 size_t overflow_refill_objs() const { return _overflow_refill_objs; } | |
0 | 203 |
1710 | 204 void note_term_attempt() { ++_term_attempts; } |
205 void note_overflow_refill(size_t objs) { | |
206 ++_overflow_refills; _overflow_refill_objs += objs; | |
0 | 207 } |
208 | |
1710 | 209 void reset_stats(); |
210 #endif // TASKQUEUE_STATS | |
211 | |
0 | 212 void start_strong_roots() { |
213 _start_strong_roots = os::elapsedTime(); | |
214 } | |
215 void end_strong_roots() { | |
216 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); | |
217 } | |
1710 | 218 double strong_roots_time() const { return _strong_roots_time; } |
0 | 219 void start_term_time() { |
1710 | 220 TASKQUEUE_STATS_ONLY(note_term_attempt()); |
0 | 221 _start_term = os::elapsedTime(); |
222 } | |
223 void end_term_time() { | |
224 _term_time += (os::elapsedTime() - _start_term); | |
225 } | |
1710 | 226 double term_time() const { return _term_time; } |
0 | 227 |
1710 | 228 double elapsed_time() const { |
0 | 229 return os::elapsedTime() - _start; |
230 } | |
231 }; | |
232 | |
233 class ParNewGenTask: public AbstractGangTask { | |
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234 private: |
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235 ParNewGeneration* _gen; |
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236 Generation* _next_gen; |
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237 HeapWord* _young_old_boundary; |
0 | 238 class ParScanThreadStateSet* _state_set; |
239 | |
240 public: | |
241 ParNewGenTask(ParNewGeneration* gen, | |
242 Generation* next_gen, | |
243 HeapWord* young_old_boundary, | |
244 ParScanThreadStateSet* state_set); | |
245 | |
246 HeapWord* young_old_boundary() { return _young_old_boundary; } | |
247 | |
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248 void work(uint worker_id); |
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249 |
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250 // Reset the terminator in ParScanThreadStateSet for |
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251 // "active_workers" threads. |
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252 virtual void set_for_termination(int active_workers); |
0 | 253 }; |
254 | |
255 class KeepAliveClosure: public DefNewGeneration::KeepAliveClosure { | |
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256 protected: |
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257 template <class T> void do_oop_work(T* p); |
0 | 258 public: |
259 KeepAliveClosure(ScanWeakRefClosure* cl); | |
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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 class EvacuateFollowersClosureGeneral: public VoidClosure { | |
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265 private: |
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266 GenCollectedHeap* _gch; |
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267 int _level; |
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268 OopsInGenClosure* _scan_cur_or_nonheap; |
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269 OopsInGenClosure* _scan_older; |
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270 public: |
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271 EvacuateFollowersClosureGeneral(GenCollectedHeap* gch, int level, |
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272 OopsInGenClosure* cur, |
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273 OopsInGenClosure* older); |
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274 virtual void do_void(); |
0 | 275 }; |
276 | |
277 // Closure for scanning ParNewGeneration. | |
278 // Same as ScanClosure, except does parallel GC barrier. | |
279 class ScanClosureWithParBarrier: public ScanClosure { | |
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280 protected: |
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281 template <class T> void do_oop_work(T* p); |
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282 public: |
0 | 283 ScanClosureWithParBarrier(ParNewGeneration* g, bool gc_barrier); |
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284 virtual void do_oop(oop* p); |
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285 virtual void do_oop(narrowOop* p); |
0 | 286 }; |
287 | |
288 // Implements AbstractRefProcTaskExecutor for ParNew. | |
289 class ParNewRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
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290 private: |
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291 ParNewGeneration& _generation; |
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292 ParScanThreadStateSet& _state_set; |
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293 public: |
0 | 294 ParNewRefProcTaskExecutor(ParNewGeneration& generation, |
295 ParScanThreadStateSet& state_set) | |
296 : _generation(generation), _state_set(state_set) | |
297 { } | |
298 | |
299 // Executes a task using worker threads. | |
300 virtual void execute(ProcessTask& task); | |
301 virtual void execute(EnqueueTask& task); | |
302 // Switch to single threaded mode. | |
303 virtual void set_single_threaded_mode(); | |
304 }; | |
305 | |
306 | |
307 // A Generation that does parallel young-gen collection. | |
308 | |
309 class ParNewGeneration: public DefNewGeneration { | |
310 friend class ParNewGenTask; | |
311 friend class ParNewRefProcTask; | |
312 friend class ParNewRefProcTaskExecutor; | |
313 friend class ParScanThreadStateSet; | |
534 | 314 friend class ParEvacuateFollowersClosure; |
0 | 315 |
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316 private: |
695 | 317 // The per-worker-thread work queues |
0 | 318 ObjToScanQueueSet* _task_queues; |
319 | |
695 | 320 // Per-worker-thread local overflow stacks |
6197 | 321 Stack<oop, mtGC>* _overflow_stacks; |
695 | 322 |
0 | 323 // Desired size of survivor space plab's |
324 PLABStats _plab_stats; | |
325 | |
326 // A list of from-space images of to-be-scanned objects, threaded through | |
327 // klass-pointers (klass information already copied to the forwarded | |
328 // image.) Manipulated with CAS. | |
329 oop _overflow_list; | |
534 | 330 NOT_PRODUCT(ssize_t _num_par_pushes;) |
0 | 331 |
332 // If true, older generation does not support promotion undo, so avoid. | |
333 static bool _avoid_promotion_undo; | |
334 | |
335 // This closure is used by the reference processor to filter out | |
336 // references to live referent. | |
337 DefNewGeneration::IsAliveClosure _is_alive_closure; | |
338 | |
339 static oop real_forwardee_slow(oop obj); | |
340 static void waste_some_time(); | |
341 | |
342 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
343 // word being overwritten with a self-forwarding-pointer. | |
344 void preserve_mark_if_necessary(oop obj, markOop m); | |
345 | |
10405 | 346 void handle_promotion_failed(GenCollectedHeap* gch, ParScanThreadStateSet& thread_state_set, ParNewTracer& gc_tracer); |
347 | |
0 | 348 protected: |
349 | |
350 bool _survivor_overflow; | |
351 | |
352 bool avoid_promotion_undo() { return _avoid_promotion_undo; } | |
353 void set_avoid_promotion_undo(bool v) { _avoid_promotion_undo = v; } | |
354 | |
355 bool survivor_overflow() { return _survivor_overflow; } | |
356 void set_survivor_overflow(bool v) { _survivor_overflow = v; } | |
357 | |
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358 public: |
0 | 359 ParNewGeneration(ReservedSpace rs, size_t initial_byte_size, int level); |
360 | |
361 ~ParNewGeneration() { | |
362 for (uint i = 0; i < ParallelGCThreads; i++) | |
363 delete _task_queues->queue(i); | |
364 | |
365 delete _task_queues; | |
366 } | |
367 | |
368 virtual void ref_processor_init(); | |
369 virtual Generation::Name kind() { return Generation::ParNew; } | |
370 virtual const char* name() const; | |
371 virtual const char* short_name() const { return "ParNew"; } | |
372 | |
373 // override | |
374 virtual bool refs_discovery_is_mt() const { | |
375 assert(UseParNewGC, "ParNewGeneration only when UseParNewGC"); | |
376 return ParallelGCThreads > 1; | |
377 } | |
378 | |
379 // Make the collection virtual. | |
380 virtual void collect(bool full, | |
381 bool clear_all_soft_refs, | |
382 size_t size, | |
383 bool is_tlab); | |
384 | |
385 // This needs to be visible to the closure function. | |
386 // "obj" is the object to be copied, "m" is a recent value of its mark | |
387 // that must not contain a forwarding pointer (though one might be | |
388 // inserted in "obj"s mark word by a parallel thread). | |
389 inline oop copy_to_survivor_space(ParScanThreadState* par_scan_state, | |
390 oop obj, size_t obj_sz, markOop m) { | |
391 if (_avoid_promotion_undo) { | |
392 return copy_to_survivor_space_avoiding_promotion_undo(par_scan_state, | |
393 obj, obj_sz, m); | |
394 } | |
395 | |
396 return copy_to_survivor_space_with_undo(par_scan_state, obj, obj_sz, m); | |
397 } | |
398 | |
399 oop copy_to_survivor_space_avoiding_promotion_undo(ParScanThreadState* par_scan_state, | |
400 oop obj, size_t obj_sz, markOop m); | |
401 | |
402 oop copy_to_survivor_space_with_undo(ParScanThreadState* par_scan_state, | |
403 oop obj, size_t obj_sz, markOop m); | |
404 | |
534 | 405 // in support of testing overflow code |
406 NOT_PRODUCT(int _overflow_counter;) | |
407 NOT_PRODUCT(bool should_simulate_overflow();) | |
408 | |
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409 // Accessor for overflow list |
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410 oop overflow_list() { return _overflow_list; } |
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411 |
0 | 412 // Push the given (from-space) object on the global overflow list. |
534 | 413 void push_on_overflow_list(oop from_space_obj, ParScanThreadState* par_scan_state); |
0 | 414 |
415 // If the global overflow list is non-empty, move some tasks from it | |
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416 // onto "work_q" (which need not be empty). No more than 1/4 of the |
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417 // available space on "work_q" is used. |
0 | 418 bool take_from_overflow_list(ParScanThreadState* par_scan_state); |
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419 bool take_from_overflow_list_work(ParScanThreadState* par_scan_state); |
0 | 420 |
421 // The task queues to be used by parallel GC threads. | |
422 ObjToScanQueueSet* task_queues() { | |
423 return _task_queues; | |
424 } | |
425 | |
426 PLABStats* plab_stats() { | |
427 return &_plab_stats; | |
428 } | |
429 | |
430 size_t desired_plab_sz() { | |
431 return _plab_stats.desired_plab_sz(); | |
432 } | |
433 | |
434 static oop real_forwardee(oop obj); | |
435 | |
436 DEBUG_ONLY(static bool is_legal_forward_ptr(oop p);) | |
437 }; | |
1972 | 438 |
439 #endif // SHARE_VM_GC_IMPLEMENTATION_PARNEW_PARNEWGENERATION_HPP |