1 /*
2 * Copyright (c) 2014, 2021, Oracle and/or its affiliates. All rights reserved.
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,
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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/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/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 G1EvacFailureRegions;
44 class G1EvacuationRootClosures;
45 class G1OopStarChunkedList;
46 class G1PLABAllocator;
47 class HeapRegion;
48 class PreservedMarks;
49 class PreservedMarksSet;
50 class outputStream;
51
52 class G1ParScanThreadState : public CHeapObj<mtGC> {
53 G1CollectedHeap* _g1h;
54 G1ScannerTasksQueue* _task_queue;
55 G1RedirtyCardsLocalQueueSet _rdc_local_qset;
56 G1CardTable* _ct;
57 G1EvacuationRootClosures* _closures;
58
59 G1PLABAllocator* _plab_allocator;
60
61 AgeTable _age_table;
62 // Local tenuring threshold.
63 uint _tenuring_threshold;
64 G1ScanEvacuatedObjClosure _scanner;
65
66 uint _worker_id;
67
68 // Remember the last enqueued card to avoid enqueuing the same card over and over;
69 // since we only ever scan a card once, this is sufficient.
70 size_t _last_enqueued_card;
71
72 // Upper and lower threshold to start and end work queue draining.
73 uint const _stack_trim_upper_threshold;
74 uint const _stack_trim_lower_threshold;
75
76 Tickspan _trim_ticks;
77 // Map from young-age-index (0 == not young, 1 is youngest) to
78 // surviving words. base is what we get back from the malloc call
79 size_t* _surviving_young_words_base;
80 // this points into the array, as we use the first few entries for padding
81 size_t* _surviving_young_words;
82 // Number of elements in the array above.
83 size_t _surviving_words_length;
84 // Indicates whether in the last generation (old) there is no more space
85 // available for allocation.
86 bool _old_gen_is_full;
87 // Size (in elements) of a partial objArray task chunk.
88 int _partial_objarray_chunk_size;
89 PartialArrayTaskStepper _partial_array_stepper;
90 StringDedup::Requests _string_dedup_requests;
91
92 G1CardTable* ct() { return _ct; }
93
94 size_t _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 EVAC_FAILURE_INJECTOR_ONLY(size_t _evac_failure_inject_counter;)
105
106 PreservedMarks* _preserved_marks;
107 EvacuationFailedInfo _evacuation_failed_info;
108 G1EvacFailureRegions* _evac_failure_regions;
109
110 bool inject_evacuation_failure(uint region_idx) EVAC_FAILURE_INJECTOR_RETURN_( return false; );
111
112 public:
113 G1ParScanThreadState(G1CollectedHeap* g1h,
114 G1RedirtyCardsQueueSet* rdcqs,
115 PreservedMarks* preserved_marks,
116 uint worker_id,
117 uint n_workers,
118 size_t young_cset_length,
119 size_t optional_cset_length,
120 G1EvacFailureRegions* evac_failure_regions);
121 virtual ~G1ParScanThreadState();
122
123 void set_ref_discoverer(ReferenceDiscoverer* rd) { _scanner.set_ref_discoverer(rd); }
124
125 #ifdef ASSERT
126 bool queue_is_empty() const { return _task_queue->is_empty(); }
127 #endif
128
129 void verify_task(narrowOop* task) const NOT_DEBUG_RETURN;
130 void verify_task(oop* task) const NOT_DEBUG_RETURN;
131 void verify_task(PartialArrayScanTask task) const NOT_DEBUG_RETURN;
132 void verify_task(ScannerTask task) const NOT_DEBUG_RETURN;
133
134 void push_on_queue(ScannerTask task);
135
136 // Apply the post barrier to the given reference field. Enqueues the card of p
137 // if the barrier does not filter out the reference for some reason (e.g.
138 // p and q are in the same region, p is in survivor, p is in collection set)
139 // To be called during GC if nothing particular about p and obj are known.
140 template <class T> void write_ref_field_post(T* p, oop obj);
141
142 // Enqueue the card if the reference's target region's remembered set is tracked.
143 // Assumes that a significant amount of pre-filtering (like done by
144 // write_ref_field_post() above) has already been performed.
145 template <class T> void enqueue_card_if_tracked(G1HeapRegionAttr region_attr, T* p, oop o);
146
147 G1EvacuationRootClosures* closures() { return _closures; }
148 uint worker_id() { return _worker_id; }
149
150 size_t lab_waste_words() const;
151 size_t lab_undo_waste_words() const;
152
153 // Pass locally gathered statistics to global state. Returns the total number of
154 // HeapWords copied.
155 size_t flush(size_t* surviving_young_words);
156
157 private:
158 void do_partial_array(PartialArrayScanTask task);
159 void start_partial_objarray(G1HeapRegionAttr dest_dir, oop from, oop to);
160
161 HeapWord* allocate_copy_slow(G1HeapRegionAttr* dest_attr,
162 oop old,
163 size_t word_sz,
164 uint age,
165 uint node_index);
166
167 void undo_allocation(G1HeapRegionAttr dest_addr,
168 HeapWord* obj_ptr,
169 size_t word_sz,
170 uint node_index);
171
172 void update_bot_after_copying(oop obj, size_t word_sz);
173
174 oop do_copy_to_survivor_space(G1HeapRegionAttr region_attr,
175 oop obj,
176 markWord old_mark);
177
178 // This method is applied to the fields of the objects that have just been copied.
179 template <class T> void do_oop_evac(T* p);
180
181 void dispatch_task(ScannerTask task);
182
183 // Tries to allocate word_sz in the PLAB of the next "generation" after trying to
184 // allocate into dest. Previous_plab_refill_failed indicates whether previous
185 // PLAB refill for the original (source) object failed.
186 // Returns a non-NULL pointer if successful, and updates dest if required.
187 // Also determines whether we should continue to try to allocate into the various
188 // generations or just end trying to allocate.
189 HeapWord* allocate_in_next_plab(G1HeapRegionAttr* dest,
190 size_t word_sz,
191 bool previous_plab_refill_failed,
192 uint node_index);
193
194 inline G1HeapRegionAttr next_region_attr(G1HeapRegionAttr const region_attr, markWord const m, uint& age);
195
196 void report_promotion_event(G1HeapRegionAttr const dest_attr,
197 oop const old, size_t word_sz, uint age,
198 HeapWord * const obj_ptr, uint node_index) const;
199
200 void trim_queue_to_threshold(uint threshold);
201
202 inline bool needs_partial_trimming() const;
203
204 // NUMA statistics related methods.
205 void initialize_numa_stats();
206 void flush_numa_stats();
207 inline void update_numa_stats(uint node_index);
208
209 public:
210 oop copy_to_survivor_space(G1HeapRegionAttr region_attr, oop obj, markWord old_mark);
211
212 inline void trim_queue();
213 inline void trim_queue_partially();
214 void steal_and_trim_queue(G1ScannerTasksQueueSet *task_queues);
215
216 Tickspan trim_ticks() const;
217 void reset_trim_ticks();
218
219 // An attempt to evacuate "obj" has failed; take necessary steps.
220 oop handle_evacuation_failure_par(oop obj, markWord m, size_t word_sz);
221
222 template <typename T>
223 inline void remember_root_into_optional_region(T* p);
224 template <typename T>
225 inline void remember_reference_into_optional_region(T* p);
226
227 inline G1OopStarChunkedList* oops_into_optional_region(const HeapRegion* hr);
228 };
229
230 class G1ParScanThreadStateSet : public StackObj {
231 G1CollectedHeap* _g1h;
232 G1RedirtyCardsQueueSet* _rdcqs;
233 PreservedMarksSet* _preserved_marks_set;
234 G1ParScanThreadState** _states;
235 size_t* _surviving_young_words_total;
236 size_t _young_cset_length;
237 size_t _optional_cset_length;
238 uint _n_workers;
239 bool _flushed;
240 G1EvacFailureRegions* _evac_failure_regions;
241
242 public:
243 G1ParScanThreadStateSet(G1CollectedHeap* g1h,
244 G1RedirtyCardsQueueSet* rdcqs,
245 PreservedMarksSet* preserved_marks_set,
246 uint n_workers,
247 size_t young_cset_length,
248 size_t optional_cset_length,
249 G1EvacFailureRegions* evac_failure_regions);
250 ~G1ParScanThreadStateSet();
251
252 G1RedirtyCardsQueueSet* rdcqs() { return _rdcqs; }
253 PreservedMarksSet* preserved_marks_set() { return _preserved_marks_set; }
254
255 void flush();
256 void record_unused_optional_region(HeapRegion* hr);
257
258 G1ParScanThreadState* state_for_worker(uint worker_id);
259
260 const size_t* surviving_young_words() const;
261 };
262
263 #endif // SHARE_GC_G1_G1PARSCANTHREADSTATE_HPP