Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parNew/parNewGeneration.hpp @ 4155:394404b2d9bd
Removed strict requirement for GRAAL environment variable. It only needs to be set now if the graal directory is not in the directory hierarchy of GraalVM JDK.
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Wed, 21 Dec 2011 11:25:27 +0100 |
| parents | bca17e38de00 |
| children | 441e946dc1af |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1665 | 2 * Copyright (c) 2001, 2010, 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 | |
| 28 #include "gc_implementation/parNew/parGCAllocBuffer.hpp" | |
| 29 #include "memory/defNewGeneration.hpp" | |
| 30 #include "utilities/taskqueue.hpp" | |
| 31 | |
| 0 | 32 class ChunkArray; |
| 33 class ParScanWithoutBarrierClosure; | |
| 34 class ParScanWithBarrierClosure; | |
| 35 class ParRootScanWithoutBarrierClosure; | |
| 36 class ParRootScanWithBarrierTwoGensClosure; | |
| 37 class ParEvacuateFollowersClosure; | |
| 38 | |
| 39 // It would be better if these types could be kept local to the .cpp file, | |
| 40 // but they must be here to allow ParScanClosure::do_oop_work to be defined | |
| 41 // in genOopClosures.inline.hpp. | |
| 42 | |
| 1665 | 43 typedef Padded<OopTaskQueue> ObjToScanQueue; |
| 44 typedef GenericTaskQueueSet<ObjToScanQueue> ObjToScanQueueSet; | |
| 0 | 45 |
| 46 class ParKeepAliveClosure: public DefNewGeneration::KeepAliveClosure { | |
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47 private: |
| 0 | 48 ParScanWeakRefClosure* _par_cl; |
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49 protected: |
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50 template <class T> void do_oop_work(T* p); |
| 0 | 51 public: |
| 52 ParKeepAliveClosure(ParScanWeakRefClosure* cl); | |
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53 virtual void do_oop(oop* p); |
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54 virtual void do_oop(narrowOop* p); |
| 0 | 55 }; |
| 56 | |
| 57 // The state needed by thread performing parallel young-gen collection. | |
| 58 class ParScanThreadState { | |
| 59 friend class ParScanThreadStateSet; | |
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60 private: |
| 0 | 61 ObjToScanQueue *_work_queue; |
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62 Stack<oop>* const _overflow_stack; |
| 0 | 63 |
| 64 ParGCAllocBuffer _to_space_alloc_buffer; | |
| 65 | |
| 66 ParScanWithoutBarrierClosure _to_space_closure; // scan_without_gc_barrier | |
| 67 ParScanWithBarrierClosure _old_gen_closure; // scan_with_gc_barrier | |
| 68 ParRootScanWithoutBarrierClosure _to_space_root_closure; // scan_root_without_gc_barrier | |
| 69 // One of these two will be passed to process_strong_roots, which will | |
| 70 // set its generation. The first is for two-gen configs where the | |
| 71 // old gen collects the perm gen; the second is for arbitrary configs. | |
| 72 // The second isn't used right now (it used to be used for the train, an | |
| 73 // incremental collector) but the declaration has been left as a reminder. | |
| 74 ParRootScanWithBarrierTwoGensClosure _older_gen_closure; | |
| 75 // This closure will always be bound to the old gen; it will be used | |
| 76 // in evacuate_followers. | |
| 77 ParRootScanWithBarrierTwoGensClosure _old_gen_root_closure; // scan_old_root_with_gc_barrier | |
| 78 ParEvacuateFollowersClosure _evacuate_followers; | |
| 79 DefNewGeneration::IsAliveClosure _is_alive_closure; | |
| 80 ParScanWeakRefClosure _scan_weak_ref_closure; | |
| 81 ParKeepAliveClosure _keep_alive_closure; | |
| 82 | |
| 83 | |
| 84 Space* _to_space; | |
| 85 Space* to_space() { return _to_space; } | |
| 86 | |
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87 ParNewGeneration* _young_gen; |
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88 ParNewGeneration* young_gen() const { return _young_gen; } |
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89 |
| 0 | 90 Generation* _old_gen; |
| 91 Generation* old_gen() { return _old_gen; } | |
| 92 | |
| 93 HeapWord *_young_old_boundary; | |
| 94 | |
| 95 int _hash_seed; | |
| 96 int _thread_num; | |
| 97 ageTable _ageTable; | |
| 98 | |
| 99 bool _to_space_full; | |
| 100 | |
| 1710 | 101 #if TASKQUEUE_STATS |
| 102 size_t _term_attempts; | |
| 103 size_t _overflow_refills; | |
| 104 size_t _overflow_refill_objs; | |
| 105 #endif // TASKQUEUE_STATS | |
| 0 | 106 |
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107 // Stats for promotion failure |
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108 size_t _promotion_failure_size; |
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109 |
| 0 | 110 // Timing numbers. |
| 111 double _start; | |
| 112 double _start_strong_roots; | |
| 113 double _strong_roots_time; | |
| 114 double _start_term; | |
| 115 double _term_time; | |
| 116 | |
| 117 // Helper for trim_queues. Scans subset of an array and makes | |
| 118 // remainder available for work stealing. | |
| 119 void scan_partial_array_and_push_remainder(oop obj); | |
| 120 | |
| 121 // In support of CMS' parallel rescan of survivor space. | |
| 122 ChunkArray* _survivor_chunk_array; | |
| 123 ChunkArray* survivor_chunk_array() { return _survivor_chunk_array; } | |
| 124 | |
| 125 void record_survivor_plab(HeapWord* plab_start, size_t plab_word_size); | |
| 126 | |
| 127 ParScanThreadState(Space* to_space_, ParNewGeneration* gen_, | |
| 128 Generation* old_gen_, int thread_num_, | |
| 695 | 129 ObjToScanQueueSet* work_queue_set_, |
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130 Stack<oop>* overflow_stacks_, |
| 695 | 131 size_t desired_plab_sz_, |
| 0 | 132 ParallelTaskTerminator& term_); |
| 133 | |
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134 public: |
| 0 | 135 ageTable* age_table() {return &_ageTable;} |
| 136 | |
| 137 ObjToScanQueue* work_queue() { return _work_queue; } | |
| 138 | |
| 139 ParGCAllocBuffer* to_space_alloc_buffer() { | |
| 140 return &_to_space_alloc_buffer; | |
| 141 } | |
| 142 | |
| 143 ParEvacuateFollowersClosure& evacuate_followers_closure() { return _evacuate_followers; } | |
| 144 DefNewGeneration::IsAliveClosure& is_alive_closure() { return _is_alive_closure; } | |
| 145 ParScanWeakRefClosure& scan_weak_ref_closure() { return _scan_weak_ref_closure; } | |
| 146 ParKeepAliveClosure& keep_alive_closure() { return _keep_alive_closure; } | |
| 147 ParScanClosure& older_gen_closure() { return _older_gen_closure; } | |
| 148 ParRootScanWithoutBarrierClosure& to_space_root_closure() { return _to_space_root_closure; }; | |
| 149 | |
| 150 // Decrease queue size below "max_size". | |
| 151 void trim_queues(int max_size); | |
| 152 | |
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153 // Private overflow stack usage |
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154 Stack<oop>* overflow_stack() { return _overflow_stack; } |
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155 bool take_from_overflow_stack(); |
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156 void push_on_overflow_stack(oop p); |
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157 |
| 0 | 158 // Is new_obj a candidate for scan_partial_array_and_push_remainder method. |
| 159 inline bool should_be_partially_scanned(oop new_obj, oop old_obj) const; | |
| 160 | |
| 161 int* hash_seed() { return &_hash_seed; } | |
| 162 int thread_num() { return _thread_num; } | |
| 163 | |
| 164 // Allocate a to-space block of size "sz", or else return NULL. | |
| 165 HeapWord* alloc_in_to_space_slow(size_t word_sz); | |
| 166 | |
| 167 HeapWord* alloc_in_to_space(size_t word_sz) { | |
| 168 HeapWord* obj = to_space_alloc_buffer()->allocate(word_sz); | |
| 169 if (obj != NULL) return obj; | |
| 170 else return alloc_in_to_space_slow(word_sz); | |
| 171 } | |
| 172 | |
| 173 HeapWord* young_old_boundary() { return _young_old_boundary; } | |
| 174 | |
| 175 void set_young_old_boundary(HeapWord *boundary) { | |
| 176 _young_old_boundary = boundary; | |
| 177 } | |
| 178 | |
| 179 // Undo the most recent allocation ("obj", of "word_sz"). | |
| 180 void undo_alloc_in_to_space(HeapWord* obj, size_t word_sz); | |
| 181 | |
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182 // Promotion failure stats |
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183 size_t promotion_failure_size() { return promotion_failure_size(); } |
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184 void log_promotion_failure(size_t sz) { |
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185 if (_promotion_failure_size == 0) { |
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186 _promotion_failure_size = sz; |
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187 } |
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188 } |
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189 void print_and_clear_promotion_failure_size(); |
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190 |
| 1710 | 191 #if TASKQUEUE_STATS |
| 192 TaskQueueStats & taskqueue_stats() const { return _work_queue->stats; } | |
| 193 | |
| 194 size_t term_attempts() const { return _term_attempts; } | |
| 195 size_t overflow_refills() const { return _overflow_refills; } | |
| 196 size_t overflow_refill_objs() const { return _overflow_refill_objs; } | |
| 0 | 197 |
| 1710 | 198 void note_term_attempt() { ++_term_attempts; } |
| 199 void note_overflow_refill(size_t objs) { | |
| 200 ++_overflow_refills; _overflow_refill_objs += objs; | |
| 0 | 201 } |
| 202 | |
| 1710 | 203 void reset_stats(); |
| 204 #endif // TASKQUEUE_STATS | |
| 205 | |
| 0 | 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 } | |
| 1710 | 212 double strong_roots_time() const { return _strong_roots_time; } |
| 0 | 213 void start_term_time() { |
| 1710 | 214 TASKQUEUE_STATS_ONLY(note_term_attempt()); |
| 0 | 215 _start_term = os::elapsedTime(); |
| 216 } | |
| 217 void end_term_time() { | |
| 218 _term_time += (os::elapsedTime() - _start_term); | |
| 219 } | |
| 1710 | 220 double term_time() const { return _term_time; } |
| 0 | 221 |
| 1710 | 222 double elapsed_time() const { |
| 0 | 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); | |
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243 |
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244 // Reset the terminator in ParScanThreadStateSet for |
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245 // "active_workers" threads. |
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246 virtual void set_for_termination(int active_workers); |
| 0 | 247 }; |
| 248 | |
| 249 class KeepAliveClosure: public DefNewGeneration::KeepAliveClosure { | |
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250 protected: |
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251 template <class T> void do_oop_work(T* p); |
| 0 | 252 public: |
| 253 KeepAliveClosure(ScanWeakRefClosure* cl); | |
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254 virtual void do_oop(oop* p); |
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255 virtual void do_oop(narrowOop* p); |
| 0 | 256 }; |
| 257 | |
| 258 class EvacuateFollowersClosureGeneral: public VoidClosure { | |
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259 private: |
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260 GenCollectedHeap* _gch; |
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261 int _level; |
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262 OopsInGenClosure* _scan_cur_or_nonheap; |
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263 OopsInGenClosure* _scan_older; |
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264 public: |
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265 EvacuateFollowersClosureGeneral(GenCollectedHeap* gch, int level, |
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266 OopsInGenClosure* cur, |
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267 OopsInGenClosure* older); |
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268 virtual void do_void(); |
| 0 | 269 }; |
| 270 | |
| 271 // Closure for scanning ParNewGeneration. | |
| 272 // Same as ScanClosure, except does parallel GC barrier. | |
| 273 class ScanClosureWithParBarrier: public ScanClosure { | |
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274 protected: |
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275 template <class T> void do_oop_work(T* p); |
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276 public: |
| 0 | 277 ScanClosureWithParBarrier(ParNewGeneration* g, bool gc_barrier); |
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278 virtual void do_oop(oop* p); |
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279 virtual void do_oop(narrowOop* p); |
| 0 | 280 }; |
| 281 | |
| 282 // Implements AbstractRefProcTaskExecutor for ParNew. | |
| 283 class ParNewRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
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284 private: |
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285 ParNewGeneration& _generation; |
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286 ParScanThreadStateSet& _state_set; |
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287 public: |
| 0 | 288 ParNewRefProcTaskExecutor(ParNewGeneration& generation, |
| 289 ParScanThreadStateSet& state_set) | |
| 290 : _generation(generation), _state_set(state_set) | |
| 291 { } | |
| 292 | |
| 293 // Executes a task using worker threads. | |
| 294 virtual void execute(ProcessTask& task); | |
| 295 virtual void execute(EnqueueTask& task); | |
| 296 // Switch to single threaded mode. | |
| 297 virtual void set_single_threaded_mode(); | |
| 298 }; | |
| 299 | |
| 300 | |
| 301 // A Generation that does parallel young-gen collection. | |
| 302 | |
| 303 class ParNewGeneration: public DefNewGeneration { | |
| 304 friend class ParNewGenTask; | |
| 305 friend class ParNewRefProcTask; | |
| 306 friend class ParNewRefProcTaskExecutor; | |
| 307 friend class ParScanThreadStateSet; | |
| 534 | 308 friend class ParEvacuateFollowersClosure; |
| 0 | 309 |
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310 private: |
| 695 | 311 // The per-worker-thread work queues |
| 0 | 312 ObjToScanQueueSet* _task_queues; |
| 313 | |
| 695 | 314 // Per-worker-thread local overflow stacks |
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315 Stack<oop>* _overflow_stacks; |
| 695 | 316 |
| 0 | 317 // Desired size of survivor space plab's |
| 318 PLABStats _plab_stats; | |
| 319 | |
| 320 // A list of from-space images of to-be-scanned objects, threaded through | |
| 321 // klass-pointers (klass information already copied to the forwarded | |
| 322 // image.) Manipulated with CAS. | |
| 323 oop _overflow_list; | |
| 534 | 324 NOT_PRODUCT(ssize_t _num_par_pushes;) |
| 0 | 325 |
| 326 // If true, older generation does not support promotion undo, so avoid. | |
| 327 static bool _avoid_promotion_undo; | |
| 328 | |
| 329 // This closure is used by the reference processor to filter out | |
| 330 // references to live referent. | |
| 331 DefNewGeneration::IsAliveClosure _is_alive_closure; | |
| 332 | |
| 333 static oop real_forwardee_slow(oop obj); | |
| 334 static void waste_some_time(); | |
| 335 | |
| 336 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
| 337 // word being overwritten with a self-forwarding-pointer. | |
| 338 void preserve_mark_if_necessary(oop obj, markOop m); | |
| 339 | |
| 340 protected: | |
| 341 | |
| 342 bool _survivor_overflow; | |
| 343 | |
| 344 bool avoid_promotion_undo() { return _avoid_promotion_undo; } | |
| 345 void set_avoid_promotion_undo(bool v) { _avoid_promotion_undo = v; } | |
| 346 | |
| 347 bool survivor_overflow() { return _survivor_overflow; } | |
| 348 void set_survivor_overflow(bool v) { _survivor_overflow = v; } | |
| 349 | |
| 350 // Adjust the tenuring threshold. See the implementation for | |
| 351 // the details of the policy. | |
| 352 virtual void adjust_desired_tenuring_threshold(); | |
| 353 | |
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354 public: |
| 0 | 355 ParNewGeneration(ReservedSpace rs, size_t initial_byte_size, int level); |
| 356 | |
| 357 ~ParNewGeneration() { | |
| 358 for (uint i = 0; i < ParallelGCThreads; i++) | |
| 359 delete _task_queues->queue(i); | |
| 360 | |
| 361 delete _task_queues; | |
| 362 } | |
| 363 | |
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364 static bool in_use(); |
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365 |
| 0 | 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 }; | |
| 1972 | 436 |
| 437 #endif // SHARE_VM_GC_IMPLEMENTATION_PARNEW_PARNEWGENERATION_HPP |