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comparison src/share/vm/gc_implementation/parNew/parNewGeneration.hpp @ 679:cea947c8a988

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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
date Sat, 28 Mar 2009 15:47:29 -0700
parents 0fbdb4381b99
children becb17ad5e51
comparison
equal deleted inserted replaced
678:4ac7d97e6101 679:cea947c8a988
53 // The state needed by thread performing parallel young-gen collection. 53 // The state needed by thread performing parallel young-gen collection.
54 class ParScanThreadState { 54 class ParScanThreadState {
55 friend class ParScanThreadStateSet; 55 friend class ParScanThreadStateSet;
56 private: 56 private:
57 ObjToScanQueue *_work_queue; 57 ObjToScanQueue *_work_queue;
58 GrowableArray<oop>* _overflow_stack;
58 59
59 ParGCAllocBuffer _to_space_alloc_buffer; 60 ParGCAllocBuffer _to_space_alloc_buffer;
60 61
61 ParScanWithoutBarrierClosure _to_space_closure; // scan_without_gc_barrier 62 ParScanWithoutBarrierClosure _to_space_closure; // scan_without_gc_barrier
62 ParScanWithBarrierClosure _old_gen_closure; // scan_with_gc_barrier 63 ParScanWithBarrierClosure _old_gen_closure; // scan_with_gc_barrier
77 78
78 79
79 Space* _to_space; 80 Space* _to_space;
80 Space* to_space() { return _to_space; } 81 Space* to_space() { return _to_space; }
81 82
83 ParNewGeneration* _young_gen;
84 ParNewGeneration* young_gen() const { return _young_gen; }
85
82 Generation* _old_gen; 86 Generation* _old_gen;
83 Generation* old_gen() { return _old_gen; } 87 Generation* old_gen() { return _old_gen; }
84 88
85 HeapWord *_young_old_boundary; 89 HeapWord *_young_old_boundary;
86 90
131 ParScanClosure& older_gen_closure() { return _older_gen_closure; } 135 ParScanClosure& older_gen_closure() { return _older_gen_closure; }
132 ParRootScanWithoutBarrierClosure& to_space_root_closure() { return _to_space_root_closure; }; 136 ParRootScanWithoutBarrierClosure& to_space_root_closure() { return _to_space_root_closure; };
133 137
134 // Decrease queue size below "max_size". 138 // Decrease queue size below "max_size".
135 void trim_queues(int max_size); 139 void trim_queues(int max_size);
140
141 // Private overflow stack usage
142 GrowableArray<oop>* overflow_stack() { return _overflow_stack; }
143 bool take_from_overflow_stack();
144 void push_on_overflow_stack(oop p);
136 145
137 // Is new_obj a candidate for scan_partial_array_and_push_remainder method. 146 // Is new_obj a candidate for scan_partial_array_and_push_remainder method.
138 inline bool should_be_partially_scanned(oop new_obj, oop old_obj) const; 147 inline bool should_be_partially_scanned(oop new_obj, oop old_obj) const;
139 148
140 int* hash_seed() { return &_hash_seed; } 149 int* hash_seed() { return &_hash_seed; }
376 385
377 // in support of testing overflow code 386 // in support of testing overflow code
378 NOT_PRODUCT(int _overflow_counter;) 387 NOT_PRODUCT(int _overflow_counter;)
379 NOT_PRODUCT(bool should_simulate_overflow();) 388 NOT_PRODUCT(bool should_simulate_overflow();)
380 389
390 // Accessor for overflow list
391 oop overflow_list() { return _overflow_list; }
392
381 // Push the given (from-space) object on the global overflow list. 393 // Push the given (from-space) object on the global overflow list.
382 void push_on_overflow_list(oop from_space_obj, ParScanThreadState* par_scan_state); 394 void push_on_overflow_list(oop from_space_obj, ParScanThreadState* par_scan_state);
383 395
384 // If the global overflow list is non-empty, move some tasks from it 396 // If the global overflow list is non-empty, move some tasks from it
385 // onto "work_q" (which must be empty). No more than 1/4 of the 397 // onto "work_q" (which need not be empty). No more than 1/4 of the
386 // max_elems of "work_q" are moved. 398 // available space on "work_q" is used.
387 bool take_from_overflow_list(ParScanThreadState* par_scan_state); 399 bool take_from_overflow_list(ParScanThreadState* par_scan_state);
400 bool take_from_overflow_list_work(ParScanThreadState* par_scan_state);
388 401
389 // The task queues to be used by parallel GC threads. 402 // The task queues to be used by parallel GC threads.
390 ObjToScanQueueSet* task_queues() { 403 ObjToScanQueueSet* task_queues() {
391 return _task_queues; 404 return _task_queues;
392 } 405 }