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src/hotspot/share/gc/g1/g1ParScanThreadState.hpp

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 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #ifndef SHARE_GC_G1_G1PARSCANTHREADSTATE_HPP
 26 #define SHARE_GC_G1_G1PARSCANTHREADSTATE_HPP
 27 
 28 #include "gc/g1/g1CollectedHeap.hpp"
 29 #include "gc/g1/g1RedirtyCardsQueue.hpp"
 30 #include "gc/g1/g1OopClosures.hpp"
 31 #include "gc/g1/g1YoungGCAllocationFailureInjector.hpp"
 32 #include "gc/g1/g1_globals.hpp"
 33 #include "gc/shared/ageTable.hpp"
 34 #include "gc/shared/copyFailedInfo.hpp"
 35 #include "gc/shared/partialArrayTaskStepper.hpp"
 36 #include "gc/shared/preservedMarks.hpp"
 37 #include "gc/shared/stringdedup/stringDedup.hpp"
 38 #include "gc/shared/taskqueue.hpp"
 39 #include "memory/allocation.hpp"
 40 #include "oops/oop.hpp"
 41 #include "utilities/ticks.hpp"
 42 
 43 class G1CardTable;
 44 class G1CollectionSet;
 45 class G1EvacFailureRegions;
 46 class G1EvacuationRootClosures;
 47 class G1OopStarChunkedList;
 48 class G1PLABAllocator;
 49 class HeapRegion;
 50 class PreservedMarks;
 51 class PreservedMarksSet;
 52 class outputStream;
 53 
 54 class G1ParScanThreadState : public CHeapObj<mtGC> {
 55   G1CollectedHeap* _g1h;
 56   G1ScannerTasksQueue* _task_queue;
 57   G1RedirtyCardsLocalQueueSet _rdc_local_qset;
 58   G1CardTable* _ct;
 59   G1EvacuationRootClosures* _closures;
 60 
 61   G1PLABAllocator* _plab_allocator;
 62 
 63   AgeTable _age_table;
 64   // Local tenuring threshold.
 65   uint _tenuring_threshold;
 66   G1ScanEvacuatedObjClosure _scanner;
 67 
 68   uint _worker_id;
 69 
 70   // Remember the last enqueued card to avoid enqueuing the same card over and over;
 71   // since we only ever scan a card once, this is sufficient.

 89   // Size (in elements) of a partial objArray task chunk.
 90   int _partial_objarray_chunk_size;
 91   PartialArrayTaskStepper _partial_array_stepper;
 92   StringDedup::Requests _string_dedup_requests;
 93 
 94   G1CardTable* ct() { return _ct; }
 95 
 96   // Maximum number of optional regions at start of gc.
 97   size_t _max_num_optional_regions;
 98   G1OopStarChunkedList* _oops_into_optional_regions;
 99 
100   G1NUMA* _numa;
101   // Records how many object allocations happened at each node during copy to survivor.
102   // Only starts recording when log of gc+heap+numa is enabled and its data is
103   // transferred when flushed.
104   size_t* _obj_alloc_stat;
105 
106   // Per-thread evacuation failure data structures.
107   ALLOCATION_FAILURE_INJECTOR_ONLY(size_t _allocation_failure_inject_counter;)
108 
109   PreservedMarks* _preserved_marks;
110   EvacuationFailedInfo _evacuation_failed_info;
111   G1EvacFailureRegions* _evac_failure_regions;
112   // Number of additional cards into evacuation failed regions enqueued into
113   // the local DCQS. This is an approximation, as cards that would be added later
114   // outside of evacuation failure will not be subtracted again.
115   size_t _evac_failure_enqueued_cards;
116 
117   // Enqueue the card if not already in the set; this is a best-effort attempt on
118   // detecting duplicates.
119   template <class T> bool enqueue_if_new(T* p);
120   // Enqueue the card of p into the (evacuation failed) region.
121   template <class T> void enqueue_card_into_evac_fail_region(T* p, oop obj);
122 
123   bool inject_allocation_failure(uint region_idx) ALLOCATION_FAILURE_INJECTOR_RETURN_( return false; );
124 
125 public:
126   G1ParScanThreadState(G1CollectedHeap* g1h,
127                        G1RedirtyCardsQueueSet* rdcqs,
128                        PreservedMarks* preserved_marks,
129                        uint worker_id,
130                        uint num_workers,
131                        G1CollectionSet* collection_set,
132                        G1EvacFailureRegions* evac_failure_regions);
133   virtual ~G1ParScanThreadState();
134 
135   void set_ref_discoverer(ReferenceDiscoverer* rd) { _scanner.set_ref_discoverer(rd); }
136 
137 #ifdef ASSERT
138   bool queue_is_empty() const { return _task_queue->is_empty(); }
139 #endif
140 
141   void verify_task(narrowOop* task) const NOT_DEBUG_RETURN;
142   void verify_task(oop* task) const NOT_DEBUG_RETURN;
143   void verify_task(PartialArrayScanTask task) const NOT_DEBUG_RETURN;
144   void verify_task(ScannerTask task) const NOT_DEBUG_RETURN;
145 
146   void push_on_queue(ScannerTask task);
147 
148   // Apply the post barrier to the given reference field. Enqueues the card of p

156   // write_ref_field_post() above) has already been performed.
157   template <class T> void enqueue_card_if_tracked(G1HeapRegionAttr region_attr, T* p, oop o);
158 
159   G1EvacuationRootClosures* closures() { return _closures; }
160   uint worker_id() { return _worker_id; }
161 
162   size_t lab_waste_words() const;
163   size_t lab_undo_waste_words() const;
164 
165   size_t evac_failure_enqueued_cards() const;
166 
167   // Pass locally gathered statistics to global state. Returns the total number of
168   // HeapWords copied.
169   size_t flush_stats(size_t* surviving_young_words, uint num_workers, BufferNodeList* buffer_log);
170 
171 private:
172   void do_partial_array(PartialArrayScanTask task);
173   void start_partial_objarray(G1HeapRegionAttr dest_dir, oop from, oop to);
174 
175   HeapWord* allocate_copy_slow(G1HeapRegionAttr* dest_attr,
176                                oop old,
177                                size_t word_sz,
178                                uint age,
179                                uint node_index);
180 
181   void undo_allocation(G1HeapRegionAttr dest_addr,
182                        HeapWord* obj_ptr,
183                        size_t word_sz,
184                        uint node_index);
185 
186   void update_bot_after_copying(oop obj, size_t word_sz);
187 
188   oop do_copy_to_survivor_space(G1HeapRegionAttr region_attr,
189                                 oop obj,
190                                 markWord old_mark);
191 
192   // This method is applied to the fields of the objects that have just been copied.
193   template <class T> void do_oop_evac(T* p);
194 
195   void dispatch_task(ScannerTask task);
196 
197   // Tries to allocate word_sz in the PLAB of the next "generation" after trying to
198   // allocate into dest. Previous_plab_refill_failed indicates whether previous
199   // PLAB refill for the original (source) object failed.
200   // Returns a non-null pointer if successful, and updates dest if required.
201   // Also determines whether we should continue to try to allocate into the various
202   // generations or just end trying to allocate.
203   HeapWord* allocate_in_next_plab(G1HeapRegionAttr* dest,
204                                   size_t word_sz,
205                                   bool previous_plab_refill_failed,
206                                   uint node_index);
207 
208   inline G1HeapRegionAttr next_region_attr(G1HeapRegionAttr const region_attr, markWord const m, uint& age);
209 
210   void report_promotion_event(G1HeapRegionAttr const dest_attr,
211                               oop const old, size_t word_sz, uint age,
212                               HeapWord * const obj_ptr, uint node_index) const;
213 
214   void trim_queue_to_threshold(uint threshold);
215 
216   inline bool needs_partial_trimming() const;
217 
218   // NUMA statistics related methods.
219   void initialize_numa_stats();
220   void flush_numa_stats();
221   inline void update_numa_stats(uint node_index);
222 
223 public:
224   oop copy_to_survivor_space(G1HeapRegionAttr region_attr, oop obj, markWord old_mark);
225 
226   inline void trim_queue();
227   inline void trim_queue_partially();
228   void steal_and_trim_queue(G1ScannerTasksQueueSet *task_queues);
229 
230   Tickspan trim_ticks() const;
231   void reset_trim_ticks();
232 
233   // An attempt to evacuate "obj" has failed; take necessary steps.
234   oop handle_evacuation_failure_par(oop obj, markWord m, size_t word_sz, bool cause_pinned);
235 
236   template <typename T>
237   inline void remember_root_into_optional_region(T* p);
238   template <typename T>
239   inline void remember_reference_into_optional_region(T* p);
240 
241   inline G1OopStarChunkedList* oops_into_optional_region(const HeapRegion* hr);
242 };
243 
244 class G1ParScanThreadStateSet : public StackObj {
245   G1CollectedHeap* _g1h;
246   G1CollectionSet* _collection_set;
247   G1RedirtyCardsQueueSet _rdcqs;
248   PreservedMarksSet _preserved_marks_set;
249   G1ParScanThreadState** _states;
250   BufferNodeList* _rdc_buffers;
251   size_t* _surviving_young_words_total;
252   uint _num_workers;
253   bool _flushed;
254   G1EvacFailureRegions* _evac_failure_regions;
255 
256  public:
257   G1ParScanThreadStateSet(G1CollectedHeap* g1h,
258                           uint num_workers,
259                           G1CollectionSet* collection_set,
260                           G1EvacFailureRegions* evac_failure_regions);
261   ~G1ParScanThreadStateSet();
262 
263   G1RedirtyCardsQueueSet* rdcqs() { return &_rdcqs; }
264   BufferNodeList* rdc_buffers() { return _rdc_buffers; }
265   PreservedMarksSet* preserved_marks_set() { return &_preserved_marks_set; }
266 
267   void flush_stats();
268   void record_unused_optional_region(HeapRegion* hr);
269 
270   G1ParScanThreadState* state_for_worker(uint worker_id);
271   uint num_workers() const { return _num_workers; }
272 
273   const size_t* surviving_young_words() const;
274 };
275 
276 #endif // SHARE_GC_G1_G1PARSCANTHREADSTATE_HPP

 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #ifndef SHARE_GC_G1_G1PARSCANTHREADSTATE_HPP
 26 #define SHARE_GC_G1_G1PARSCANTHREADSTATE_HPP
 27 
 28 #include "gc/g1/g1CollectedHeap.hpp"
 29 #include "gc/g1/g1RedirtyCardsQueue.hpp"
 30 #include "gc/g1/g1OopClosures.hpp"
 31 #include "gc/g1/g1YoungGCAllocationFailureInjector.hpp"
 32 #include "gc/g1/g1_globals.hpp"
 33 #include "gc/shared/ageTable.hpp"
 34 #include "gc/shared/copyFailedInfo.hpp"
 35 #include "gc/shared/partialArrayTaskStepper.hpp"

 36 #include "gc/shared/stringdedup/stringDedup.hpp"
 37 #include "gc/shared/taskqueue.hpp"
 38 #include "memory/allocation.hpp"
 39 #include "oops/oop.hpp"
 40 #include "utilities/ticks.hpp"
 41 
 42 class G1CardTable;
 43 class G1CollectionSet;
 44 class G1EvacFailureRegions;
 45 class G1EvacuationRootClosures;
 46 class G1OopStarChunkedList;
 47 class G1PLABAllocator;
 48 class HeapRegion;


 49 class outputStream;
 50 
 51 class G1ParScanThreadState : public CHeapObj<mtGC> {
 52   G1CollectedHeap* _g1h;
 53   G1ScannerTasksQueue* _task_queue;
 54   G1RedirtyCardsLocalQueueSet _rdc_local_qset;
 55   G1CardTable* _ct;
 56   G1EvacuationRootClosures* _closures;
 57 
 58   G1PLABAllocator* _plab_allocator;
 59 
 60   AgeTable _age_table;
 61   // Local tenuring threshold.
 62   uint _tenuring_threshold;
 63   G1ScanEvacuatedObjClosure _scanner;
 64 
 65   uint _worker_id;
 66 
 67   // Remember the last enqueued card to avoid enqueuing the same card over and over;
 68   // since we only ever scan a card once, this is sufficient.

 86   // Size (in elements) of a partial objArray task chunk.
 87   int _partial_objarray_chunk_size;
 88   PartialArrayTaskStepper _partial_array_stepper;
 89   StringDedup::Requests _string_dedup_requests;
 90 
 91   G1CardTable* ct() { return _ct; }
 92 
 93   // Maximum number of optional regions at start of gc.
 94   size_t _max_num_optional_regions;
 95   G1OopStarChunkedList* _oops_into_optional_regions;
 96 
 97   G1NUMA* _numa;
 98   // Records how many object allocations happened at each node during copy to survivor.
 99   // Only starts recording when log of gc+heap+numa is enabled and its data is
100   // transferred when flushed.
101   size_t* _obj_alloc_stat;
102 
103   // Per-thread evacuation failure data structures.
104   ALLOCATION_FAILURE_INJECTOR_ONLY(size_t _allocation_failure_inject_counter;)
105 

106   EvacuationFailedInfo _evacuation_failed_info;
107   G1EvacFailureRegions* _evac_failure_regions;
108   // Number of additional cards into evacuation failed regions enqueued into
109   // the local DCQS. This is an approximation, as cards that would be added later
110   // outside of evacuation failure will not be subtracted again.
111   size_t _evac_failure_enqueued_cards;
112 
113   // Enqueue the card if not already in the set; this is a best-effort attempt on
114   // detecting duplicates.
115   template <class T> bool enqueue_if_new(T* p);
116   // Enqueue the card of p into the (evacuation failed) region.
117   template <class T> void enqueue_card_into_evac_fail_region(T* p, oop obj);
118 
119   bool inject_allocation_failure(uint region_idx) ALLOCATION_FAILURE_INJECTOR_RETURN_( return false; );
120 
121 public:
122   G1ParScanThreadState(G1CollectedHeap* g1h,
123                        G1RedirtyCardsQueueSet* rdcqs,

124                        uint worker_id,
125                        uint num_workers,
126                        G1CollectionSet* collection_set,
127                        G1EvacFailureRegions* evac_failure_regions);
128   virtual ~G1ParScanThreadState();
129 
130   void set_ref_discoverer(ReferenceDiscoverer* rd) { _scanner.set_ref_discoverer(rd); }
131 
132 #ifdef ASSERT
133   bool queue_is_empty() const { return _task_queue->is_empty(); }
134 #endif
135 
136   void verify_task(narrowOop* task) const NOT_DEBUG_RETURN;
137   void verify_task(oop* task) const NOT_DEBUG_RETURN;
138   void verify_task(PartialArrayScanTask task) const NOT_DEBUG_RETURN;
139   void verify_task(ScannerTask task) const NOT_DEBUG_RETURN;
140 
141   void push_on_queue(ScannerTask task);
142 
143   // Apply the post barrier to the given reference field. Enqueues the card of p

151   // write_ref_field_post() above) has already been performed.
152   template <class T> void enqueue_card_if_tracked(G1HeapRegionAttr region_attr, T* p, oop o);
153 
154   G1EvacuationRootClosures* closures() { return _closures; }
155   uint worker_id() { return _worker_id; }
156 
157   size_t lab_waste_words() const;
158   size_t lab_undo_waste_words() const;
159 
160   size_t evac_failure_enqueued_cards() const;
161 
162   // Pass locally gathered statistics to global state. Returns the total number of
163   // HeapWords copied.
164   size_t flush_stats(size_t* surviving_young_words, uint num_workers, BufferNodeList* buffer_log);
165 
166 private:
167   void do_partial_array(PartialArrayScanTask task);
168   void start_partial_objarray(G1HeapRegionAttr dest_dir, oop from, oop to);
169 
170   HeapWord* allocate_copy_slow(G1HeapRegionAttr* dest_attr,
171                                Klass* klass,
172                                size_t word_sz,
173                                uint age,
174                                uint node_index);
175 
176   void undo_allocation(G1HeapRegionAttr dest_addr,
177                        HeapWord* obj_ptr,
178                        size_t word_sz,
179                        uint node_index);
180 
181   void update_bot_after_copying(oop obj, size_t word_sz);
182 
183   oop do_copy_to_survivor_space(G1HeapRegionAttr region_attr,
184                                 oop obj,
185                                 markWord old_mark);
186 
187   // This method is applied to the fields of the objects that have just been copied.
188   template <class T> void do_oop_evac(T* p);
189 
190   void dispatch_task(ScannerTask task);
191 
192   // Tries to allocate word_sz in the PLAB of the next "generation" after trying to
193   // allocate into dest. Previous_plab_refill_failed indicates whether previous
194   // PLAB refill for the original (source) object failed.
195   // Returns a non-null pointer if successful, and updates dest if required.
196   // Also determines whether we should continue to try to allocate into the various
197   // generations or just end trying to allocate.
198   HeapWord* allocate_in_next_plab(G1HeapRegionAttr* dest,
199                                   size_t word_sz,
200                                   bool previous_plab_refill_failed,
201                                   uint node_index);
202 
203   inline G1HeapRegionAttr next_region_attr(G1HeapRegionAttr const region_attr, markWord const m, uint& age);
204 
205   void report_promotion_event(G1HeapRegionAttr const dest_attr,
206                               Klass* klass, size_t word_sz, uint age,
207                               HeapWord * const obj_ptr, uint node_index) const;
208 
209   void trim_queue_to_threshold(uint threshold);
210 
211   inline bool needs_partial_trimming() const;
212 
213   // NUMA statistics related methods.
214   void initialize_numa_stats();
215   void flush_numa_stats();
216   inline void update_numa_stats(uint node_index);
217 
218 public:
219   oop copy_to_survivor_space(G1HeapRegionAttr region_attr, oop obj, markWord old_mark);
220 
221   inline void trim_queue();
222   inline void trim_queue_partially();
223   void steal_and_trim_queue(G1ScannerTasksQueueSet *task_queues);
224 
225   Tickspan trim_ticks() const;
226   void reset_trim_ticks();
227 
228   // An attempt to evacuate "obj" has failed; take necessary steps.
229   oop handle_evacuation_failure_par(oop obj, markWord m, size_t word_sz, bool cause_pinned);
230 
231   template <typename T>
232   inline void remember_root_into_optional_region(T* p);
233   template <typename T>
234   inline void remember_reference_into_optional_region(T* p);
235 
236   inline G1OopStarChunkedList* oops_into_optional_region(const HeapRegion* hr);
237 };
238 
239 class G1ParScanThreadStateSet : public StackObj {
240   G1CollectedHeap* _g1h;
241   G1CollectionSet* _collection_set;
242   G1RedirtyCardsQueueSet _rdcqs;

243   G1ParScanThreadState** _states;
244   BufferNodeList* _rdc_buffers;
245   size_t* _surviving_young_words_total;
246   uint _num_workers;
247   bool _flushed;
248   G1EvacFailureRegions* _evac_failure_regions;
249 
250  public:
251   G1ParScanThreadStateSet(G1CollectedHeap* g1h,
252                           uint num_workers,
253                           G1CollectionSet* collection_set,
254                           G1EvacFailureRegions* evac_failure_regions);
255   ~G1ParScanThreadStateSet();
256 
257   G1RedirtyCardsQueueSet* rdcqs() { return &_rdcqs; }
258   BufferNodeList* rdc_buffers() { return _rdc_buffers; }

259 
260   void flush_stats();
261   void record_unused_optional_region(HeapRegion* hr);
262 
263   G1ParScanThreadState* state_for_worker(uint worker_id);
264   uint num_workers() const { return _num_workers; }
265 
266   const size_t* surviving_young_words() const;
267 };
268 
269 #endif // SHARE_GC_G1_G1PARSCANTHREADSTATE_HPP
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