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,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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
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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/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 G1EvacFailureRegions;
45 class G1EvacuationRootClosures;
46 class G1OopStarChunkedList;
47 class G1PLABAllocator;
48 class HeapRegion;
49 class PreservedMarks;
50 class PreservedMarksSet;
51 class outputStream;
52
53 class G1ParScanThreadState : public CHeapObj<mtGC> {
54 G1CollectedHeap* _g1h;
55 G1ScannerTasksQueue* _task_queue;
56 G1RedirtyCardsLocalQueueSet _rdc_local_qset;
57 G1CardTable* _ct;
58 G1EvacuationRootClosures* _closures;
59
60 G1PLABAllocator* _plab_allocator;
61
62 AgeTable _age_table;
63 // Local tenuring threshold.
64 uint _tenuring_threshold;
65 G1ScanEvacuatedObjClosure _scanner;
66
67 uint _worker_id;
68
69 // Remember the last enqueued card to avoid enqueuing the same card over and over;
70 // since we only ever scan a card once, this is sufficient.
71 size_t _last_enqueued_card;
72
73 // Upper and lower threshold to start and end work queue draining.
74 uint const _stack_trim_upper_threshold;
75 uint const _stack_trim_lower_threshold;
76
77 Tickspan _trim_ticks;
78 // Map from young-age-index (0 == not young, 1 is youngest) to
79 // surviving words. base is what we get back from the malloc call
80 size_t* _surviving_young_words_base;
81 // this points into the array, as we use the first few entries for padding
82 size_t* _surviving_young_words;
83 // Number of elements in the array above.
84 size_t _surviving_words_length;
85 // Indicates whether in the last generation (old) there is no more space
86 // available for allocation.
87 bool _old_gen_is_full;
88 // Size (in elements) of a partial objArray task chunk.
89 int _partial_objarray_chunk_size;
90 PartialArrayTaskStepper _partial_array_stepper;
91 StringDedup::Requests _string_dedup_requests;
92
93 G1CardTable* ct() { return _ct; }
94
95 size_t _num_optional_regions;
96 G1OopStarChunkedList* _oops_into_optional_regions;
97
98 G1NUMA* _numa;
99 // Records how many object allocations happened at each node during copy to survivor.
100 // Only starts recording when log of gc+heap+numa is enabled and its data is
101 // transferred when flushed.
102 size_t* _obj_alloc_stat;
103
104 // Per-thread evacuation failure data structures.
105 EVAC_FAILURE_INJECTOR_ONLY(size_t _evac_failure_inject_counter;)
106
107 PreservedMarks* _preserved_marks;
108 EvacuationFailedInfo _evacuation_failed_info;
109 G1EvacFailureRegions* _evac_failure_regions;
110
111 bool inject_evacuation_failure(uint region_idx) EVAC_FAILURE_INJECTOR_RETURN_( return false; );
112
113 public:
114 G1ParScanThreadState(G1CollectedHeap* g1h,
115 G1RedirtyCardsQueueSet* rdcqs,
116 PreservedMarks* preserved_marks,
117 uint worker_id,
118 uint n_workers,
119 size_t young_cset_length,
120 size_t optional_cset_length,
121 G1EvacFailureRegions* evac_failure_regions);
122 virtual ~G1ParScanThreadState();
123
124 void set_ref_discoverer(ReferenceDiscoverer* rd) { _scanner.set_ref_discoverer(rd); }
125
126 #ifdef ASSERT
127 bool queue_is_empty() const { return _task_queue->is_empty(); }
128 #endif
129
130 void verify_task(narrowOop* task) const NOT_DEBUG_RETURN;
131 void verify_task(oop* task) const NOT_DEBUG_RETURN;
132 void verify_task(PartialArrayScanTask task) const NOT_DEBUG_RETURN;
133 void verify_task(ScannerTask task) const NOT_DEBUG_RETURN;
134
135 void push_on_queue(ScannerTask task);
136
137 // Apply the post barrier to the given reference field. Enqueues the card of p
138 // if the barrier does not filter out the reference for some reason (e.g.
139 // p and q are in the same region, p is in survivor, p is in collection set)
140 // To be called during GC if nothing particular about p and obj are known.
141 template <class T> void write_ref_field_post(T* p, oop obj);
142
143 // Enqueue the card if the reference's target region's remembered set is tracked.
144 // Assumes that a significant amount of pre-filtering (like done by
145 // write_ref_field_post() above) has already been performed.
146 template <class T> void enqueue_card_if_tracked(G1HeapRegionAttr region_attr, T* p, oop o);
147
148 G1EvacuationRootClosures* closures() { return _closures; }
149 uint worker_id() { return _worker_id; }
150
151 size_t lab_waste_words() const;
152 size_t lab_undo_waste_words() const;
153
154 // Pass locally gathered statistics to global state. Returns the total number of
155 // HeapWords copied.
156 size_t flush_stats(size_t* surviving_young_words, uint num_workers);
157
158 private:
159 void do_partial_array(PartialArrayScanTask task);
160 void start_partial_objarray(G1HeapRegionAttr dest_dir, oop from, oop to);
161
162 HeapWord* allocate_copy_slow(G1HeapRegionAttr* dest_attr,
163 oop old,
164 size_t word_sz,
165 uint age,
166 uint node_index);
167
168 void undo_allocation(G1HeapRegionAttr dest_addr,
169 HeapWord* obj_ptr,
170 size_t word_sz,
171 uint node_index);
172
173 void update_bot_after_copying(oop obj, size_t word_sz);
174
175 oop do_copy_to_survivor_space(G1HeapRegionAttr region_attr,
176 oop obj,
177 markWord old_mark);
178
179 // This method is applied to the fields of the objects that have just been copied.
180 template <class T> void do_oop_evac(T* p);
181
182 void dispatch_task(ScannerTask task);
183
184 // Tries to allocate word_sz in the PLAB of the next "generation" after trying to
185 // allocate into dest. Previous_plab_refill_failed indicates whether previous
186 // PLAB refill for the original (source) object failed.
187 // Returns a non-NULL pointer if successful, and updates dest if required.
188 // Also determines whether we should continue to try to allocate into the various
189 // generations or just end trying to allocate.
190 HeapWord* allocate_in_next_plab(G1HeapRegionAttr* dest,
191 size_t word_sz,
192 bool previous_plab_refill_failed,
193 uint node_index);
194
195 inline G1HeapRegionAttr next_region_attr(G1HeapRegionAttr const region_attr, markWord const m, uint& age);
196
197 void report_promotion_event(G1HeapRegionAttr const dest_attr,
198 oop const old, size_t word_sz, uint age,
199 HeapWord * const obj_ptr, uint node_index) const;
200
201 void trim_queue_to_threshold(uint threshold);
202
203 inline bool needs_partial_trimming() const;
204
205 // NUMA statistics related methods.
206 void initialize_numa_stats();
207 void flush_numa_stats();
208 inline void update_numa_stats(uint node_index);
209
210 public:
211 oop copy_to_survivor_space(G1HeapRegionAttr region_attr, oop obj, markWord old_mark);
212
213 inline void trim_queue();
214 inline void trim_queue_partially();
215 void steal_and_trim_queue(G1ScannerTasksQueueSet *task_queues);
216
217 Tickspan trim_ticks() const;
218 void reset_trim_ticks();
219
220 // An attempt to evacuate "obj" has failed; take necessary steps.
221 oop handle_evacuation_failure_par(oop obj, markWord m, size_t word_sz);
222
223 template <typename T>
224 inline void remember_root_into_optional_region(T* p);
225 template <typename T>
226 inline void remember_reference_into_optional_region(T* p);
227
228 inline G1OopStarChunkedList* oops_into_optional_region(const HeapRegion* hr);
229 };
230
231 class G1ParScanThreadStateSet : public StackObj {
232 G1CollectedHeap* _g1h;
233 G1RedirtyCardsQueueSet _rdcqs;
234 PreservedMarksSet _preserved_marks_set;
235 G1ParScanThreadState** _states;
236 size_t* _surviving_young_words_total;
237 size_t _young_cset_length;
238 size_t _optional_cset_length;
239 uint _n_workers;
240 bool _flushed;
241 G1EvacFailureRegions* _evac_failure_regions;
242
243 public:
244 G1ParScanThreadStateSet(G1CollectedHeap* g1h,
245 uint n_workers,
246 size_t young_cset_length,
247 size_t optional_cset_length,
248 G1EvacFailureRegions* evac_failure_regions);
249 ~G1ParScanThreadStateSet();
250
251 G1RedirtyCardsQueueSet* rdcqs() { return &_rdcqs; }
252 PreservedMarksSet* preserved_marks_set() { return &_preserved_marks_set; }
253
254 void flush_stats();
255 void record_unused_optional_region(HeapRegion* hr);
256
257 G1ParScanThreadState* state_for_worker(uint worker_id);
258
259 const size_t* surviving_young_words() const;
260 };
261
262 #endif // SHARE_GC_G1_G1PARSCANTHREADSTATE_HPP