1 /*
2 * Copyright (c) 2014, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
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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
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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/g1YoungGCEvacFailureInjector.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.
72 size_t _last_enqueued_card;
73
74 // Upper and lower threshold to start and end work queue draining.
75 uint const _stack_trim_upper_threshold;
76 uint const _stack_trim_lower_threshold;
77
78 Tickspan _trim_ticks;
79 // Map from young-age-index (0 == not young, 1 is youngest) to
80 // surviving words. base is what we get back from the malloc call
81 size_t* _surviving_young_words_base;
82 // this points into the array, as we use the first few entries for padding
83 size_t* _surviving_young_words;
84 // Number of elements in the array above.
85 size_t _surviving_words_length;
86 // Indicates whether in the last generation (old) there is no more space
87 // available for allocation.
88 bool _old_gen_is_full;
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 EVAC_FAILURE_INJECTOR_ONLY(size_t _evac_failure_inject_counter;)
108
109 PreservedMarks* _preserved_marks;
110 EvacuationFailedInfo _evacuation_failed_info;
111 G1EvacFailureRegions* _evac_failure_regions;
112
113 bool inject_evacuation_failure(uint region_idx) EVAC_FAILURE_INJECTOR_RETURN_( return false; );
114
115 public:
116 G1ParScanThreadState(G1CollectedHeap* g1h,
117 G1RedirtyCardsQueueSet* rdcqs,
118 PreservedMarks* preserved_marks,
119 uint worker_id,
120 uint num_workers,
121 G1CollectionSet* collection_set,
122 G1EvacFailureRegions* evac_failure_regions);
123 virtual ~G1ParScanThreadState();
124
125 void set_ref_discoverer(ReferenceDiscoverer* rd) { _scanner.set_ref_discoverer(rd); }
126
127 #ifdef ASSERT
128 bool queue_is_empty() const { return _task_queue->is_empty(); }
129 #endif
130
131 void verify_task(narrowOop* task) const NOT_DEBUG_RETURN;
132 void verify_task(oop* task) const NOT_DEBUG_RETURN;
133 void verify_task(PartialArrayScanTask task) const NOT_DEBUG_RETURN;
134 void verify_task(ScannerTask task) const NOT_DEBUG_RETURN;
135
136 void push_on_queue(ScannerTask task);
137
138 // Apply the post barrier to the given reference field. Enqueues the card of p
139 // if the barrier does not filter out the reference for some reason (e.g.
140 // p and q are in the same region, p is in survivor, p is in collection set)
141 // To be called during GC if nothing particular about p and obj are known.
142 template <class T> void write_ref_field_post(T* p, oop obj);
143
144 // Enqueue the card if the reference's target region's remembered set is tracked.
145 // Assumes that a significant amount of pre-filtering (like done by
146 // write_ref_field_post() above) has already been performed.
147 template <class T> void enqueue_card_if_tracked(G1HeapRegionAttr region_attr, T* p, oop o);
148
149 G1EvacuationRootClosures* closures() { return _closures; }
150 uint worker_id() { return _worker_id; }
151
152 size_t lab_waste_words() const;
153 size_t lab_undo_waste_words() const;
154
155 // Pass locally gathered statistics to global state. Returns the total number of
156 // HeapWords copied.
157 size_t flush_stats(size_t* surviving_young_words, uint num_workers);
158
159 private:
160 void do_partial_array(PartialArrayScanTask task);
161 void start_partial_objarray(G1HeapRegionAttr dest_dir, oop from, oop to);
162
163 HeapWord* allocate_copy_slow(G1HeapRegionAttr* dest_attr,
164 oop old,
165 size_t word_sz,
166 uint age,
167 uint node_index);
168
169 void undo_allocation(G1HeapRegionAttr dest_addr,
170 HeapWord* obj_ptr,
171 size_t word_sz,
172 uint node_index);
173
174 void update_bot_after_copying(oop obj, size_t word_sz);
175
176 oop do_copy_to_survivor_space(G1HeapRegionAttr region_attr,
177 oop obj,
178 markWord old_mark);
179
180 // This method is applied to the fields of the objects that have just been copied.
181 template <class T> void do_oop_evac(T* p);
182
183 void dispatch_task(ScannerTask task);
184
185 // Tries to allocate word_sz in the PLAB of the next "generation" after trying to
186 // allocate into dest. Previous_plab_refill_failed indicates whether previous
187 // PLAB refill for the original (source) object failed.
188 // Returns a non-null pointer if successful, and updates dest if required.
189 // Also determines whether we should continue to try to allocate into the various
190 // generations or just end trying to allocate.
191 HeapWord* allocate_in_next_plab(G1HeapRegionAttr* dest,
192 size_t word_sz,
193 bool previous_plab_refill_failed,
194 uint node_index);
195
196 inline G1HeapRegionAttr next_region_attr(G1HeapRegionAttr const region_attr, markWord const m, uint& age);
197
198 void report_promotion_event(G1HeapRegionAttr const dest_attr,
199 oop const old, size_t word_sz, uint age,
200 HeapWord * const obj_ptr, uint node_index) const;
201
202 void trim_queue_to_threshold(uint threshold);
203
204 inline bool needs_partial_trimming() const;
205
206 // NUMA statistics related methods.
207 void initialize_numa_stats();
208 void flush_numa_stats();
209 inline void update_numa_stats(uint node_index);
210
211 public:
212 oop copy_to_survivor_space(G1HeapRegionAttr region_attr, oop obj, markWord old_mark);
213
214 inline void trim_queue();
215 inline void trim_queue_partially();
216 void steal_and_trim_queue(G1ScannerTasksQueueSet *task_queues);
217
218 Tickspan trim_ticks() const;
219 void reset_trim_ticks();
220
221 // An attempt to evacuate "obj" has failed; take necessary steps.
222 oop handle_evacuation_failure_par(oop obj, markWord m, size_t word_sz);
223
224 template <typename T>
225 inline void remember_root_into_optional_region(T* p);
226 template <typename T>
227 inline void remember_reference_into_optional_region(T* p);
228
229 inline G1OopStarChunkedList* oops_into_optional_region(const HeapRegion* hr);
230 };
231
232 class G1ParScanThreadStateSet : public StackObj {
233 G1CollectedHeap* _g1h;
234 G1CollectionSet* _collection_set;
235 G1RedirtyCardsQueueSet _rdcqs;
236 PreservedMarksSet _preserved_marks_set;
237 G1ParScanThreadState** _states;
238 size_t* _surviving_young_words_total;
239 uint _num_workers;
240 bool _flushed;
241 G1EvacFailureRegions* _evac_failure_regions;
242
243 public:
244 G1ParScanThreadStateSet(G1CollectedHeap* g1h,
245 uint num_workers,
246 G1CollectionSet* collection_set,
247 G1EvacFailureRegions* evac_failure_regions);
248 ~G1ParScanThreadStateSet();
249
250 G1RedirtyCardsQueueSet* rdcqs() { return &_rdcqs; }
251 PreservedMarksSet* preserved_marks_set() { return &_preserved_marks_set; }
252
253 void flush_stats();
254 void record_unused_optional_region(HeapRegion* hr);
255
256 G1ParScanThreadState* state_for_worker(uint worker_id);
257
258 const size_t* surviving_young_words() const;
259 };
260
261 #endif // SHARE_GC_G1_G1PARSCANTHREADSTATE_HPP