1 /*
2 * Copyright (c) 2014, 2020, 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.
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
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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/g1CardTable.hpp"
29 #include "gc/g1/g1CollectedHeap.hpp"
30 #include "gc/g1/g1RedirtyCardsQueue.hpp"
31 #include "gc/g1/g1OopClosures.hpp"
32 #include "gc/g1/g1RemSet.hpp"
33 #include "gc/g1/heapRegionRemSet.hpp"
34 #include "gc/shared/ageTable.hpp"
35 #include "gc/shared/taskqueue.hpp"
36 #include "memory/allocation.hpp"
37 #include "oops/oop.hpp"
38 #include "utilities/ticks.hpp"
39
40 class G1OopStarChunkedList;
41 class G1PLABAllocator;
42 class G1EvacuationRootClosures;
43 class HeapRegion;
44 class outputStream;
45
46 class G1ParScanThreadState : public CHeapObj<mtGC> {
47 G1CollectedHeap* _g1h;
48 G1ScannerTasksQueue* _task_queue;
49 G1RedirtyCardsQueue _rdcq;
50 G1CardTable* _ct;
51 G1EvacuationRootClosures* _closures;
52
53 G1PLABAllocator* _plab_allocator;
54
55 AgeTable _age_table;
56 G1HeapRegionAttr _dest[G1HeapRegionAttr::Num];
57 // Local tenuring threshold.
58 uint _tenuring_threshold;
59 G1ScanEvacuatedObjClosure _scanner;
60
61 uint _worker_id;
62
63 // Remember the last enqueued card to avoid enqueuing the same card over and over;
64 // since we only ever scan a card once, this is sufficient.
65 size_t _last_enqueued_card;
66
67 // Upper and lower threshold to start and end work queue draining.
68 uint const _stack_trim_upper_threshold;
69 uint const _stack_trim_lower_threshold;
70
71 Tickspan _trim_ticks;
72 // Map from young-age-index (0 == not young, 1 is youngest) to
73 // surviving words. base is what we get back from the malloc call
74 size_t* _surviving_young_words_base;
75 // this points into the array, as we use the first few entries for padding
76 size_t* _surviving_young_words;
77 // Number of elements in the array above.
78 size_t _surviving_words_length;
79 // Indicates whether in the last generation (old) there is no more space
80 // available for allocation.
81 bool _old_gen_is_full;
82
83 int _objarray_scan_chunk_size;
84 int _objarray_length_offset_in_bytes;
85
86 G1RedirtyCardsQueue& redirty_cards_queue() { return _rdcq; }
87 G1CardTable* ct() { return _ct; }
88
89 G1HeapRegionAttr dest(G1HeapRegionAttr original) const {
90 assert(original.is_valid(),
91 "Original region attr invalid: %s", original.get_type_str());
92 assert(_dest[original.type()].is_valid_gen(),
93 "Dest region attr is invalid: %s", _dest[original.type()].get_type_str());
94 return _dest[original.type()];
95 }
96
97 size_t _num_optional_regions;
98 G1OopStarChunkedList* _oops_into_optional_regions;
99
100 G1NUMA* _numa;
101
102 // Records how many object allocations happened at each node during copy to survivor.
103 // Only starts recording when log of gc+heap+numa is enabled and its data is
104 // transferred when flushed.
105 size_t* _obj_alloc_stat;
106
107 public:
108 G1ParScanThreadState(G1CollectedHeap* g1h,
109 G1RedirtyCardsQueueSet* rdcqs,
110 uint worker_id,
111 size_t young_cset_length,
112 size_t optional_cset_length);
113 virtual ~G1ParScanThreadState();
114
115 void set_ref_discoverer(ReferenceDiscoverer* rd) { _scanner.set_ref_discoverer(rd); }
116
117 #ifdef ASSERT
118 bool queue_is_empty() const { return _task_queue->is_empty(); }
119 #endif
120
121 void verify_task(narrowOop* task) const NOT_DEBUG_RETURN;
122 void verify_task(oop* task) const NOT_DEBUG_RETURN;
123 void verify_task(PartialArrayScanTask task) const NOT_DEBUG_RETURN;
124 void verify_task(ScannerTask task) const NOT_DEBUG_RETURN;
125
126 void push_on_queue(ScannerTask task);
127
128 template <class T> void enqueue_card_if_tracked(G1HeapRegionAttr region_attr, T* p, oop o) {
129 assert(!HeapRegion::is_in_same_region(p, o), "Should have filtered out cross-region references already.");
130 assert(!_g1h->heap_region_containing(p)->is_young(), "Should have filtered out from-young references already.");
131
132 #ifdef ASSERT
133 HeapRegion* const hr_obj = _g1h->heap_region_containing(o);
134 assert(region_attr.needs_remset_update() == hr_obj->rem_set()->is_tracked(),
135 "State flag indicating remset tracking disagrees (%s) with actual remembered set (%s) for region %u",
136 BOOL_TO_STR(region_attr.needs_remset_update()),
137 BOOL_TO_STR(hr_obj->rem_set()->is_tracked()),
138 hr_obj->hrm_index());
139 #endif
140 if (!region_attr.needs_remset_update()) {
141 return;
142 }
143 size_t card_index = ct()->index_for(p);
144 // If the card hasn't been added to the buffer, do it.
145 if (_last_enqueued_card != card_index) {
146 redirty_cards_queue().enqueue(ct()->byte_for_index(card_index));
147 _last_enqueued_card = card_index;
148 }
149 }
150
151 G1EvacuationRootClosures* closures() { return _closures; }
152 uint worker_id() { return _worker_id; }
153
154 size_t lab_waste_words() const;
155 size_t lab_undo_waste_words() const;
156
157 // Pass locally gathered statistics to global state. Returns the total number of
158 // HeapWords copied.
159 size_t flush(size_t* surviving_young_words);
160
161 private:
162 inline void do_partial_array(PartialArrayScanTask task);
163 inline oop start_partial_objArray(G1HeapRegionAttr dest_dir, oop from, oop to);
164
165 HeapWord* allocate_copy_slow(G1HeapRegionAttr* dest_attr,
166 oop old,
167 size_t word_sz,
168 uint age,
169 uint node_index);
170
171 void undo_allocation(G1HeapRegionAttr dest_addr,
172 HeapWord* obj_ptr,
173 size_t word_sz,
174 uint node_index);
175
176 inline 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> inline void do_oop_evac(T* p);
182
183 inline 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);
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 G1RedirtyCardsQueueSet* _rdcqs;
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
242 public:
243 G1ParScanThreadStateSet(G1CollectedHeap* g1h,
244 G1RedirtyCardsQueueSet* rdcqs,
245 uint n_workers,
246 size_t young_cset_length,
247 size_t optional_cset_length);
248 ~G1ParScanThreadStateSet();
249
250 void flush();
251 void record_unused_optional_region(HeapRegion* hr);
252
253 G1ParScanThreadState* state_for_worker(uint worker_id);
254
255 const size_t* surviving_young_words() const;
256
257 private:
258 G1ParScanThreadState* new_par_scan_state(uint worker_id, size_t young_cset_length);
259 };
260
261 #endif // SHARE_GC_G1_G1PARSCANTHREADSTATE_HPP