1 /*
2 * Copyright Amazon.com Inc. 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
21 * questions.
22 *
23 */
24 #include "precompiled.hpp"
25
26 #include "gc/shenandoah/shenandoahAgeCensus.hpp"
27 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
28 #include "gc/shenandoah/shenandoahEvacTracker.hpp"
29 #include "gc/shenandoah/shenandoahThreadLocalData.hpp"
30 #include "gc/shenandoah/shenandoahRootProcessor.hpp"
31 #include "runtime/threadSMR.inline.hpp"
32 #include "runtime/thread.hpp"
33
34 ShenandoahEvacuationStats::ShenandoahEvacuationStats(bool generational)
35 : _evacuations_completed(0), _bytes_completed(0),
36 _evacuations_attempted(0), _bytes_attempted(0),
37 _use_age_table(generational && (ShenandoahGenerationalCensusAtEvac || !ShenandoahGenerationalAdaptiveTenuring)) {
38 if (_use_age_table) {
39 _age_table = new AgeTable(false);
40 }
41 }
42
43 AgeTable* ShenandoahEvacuationStats::age_table() const {
44 assert(_use_age_table, "Don't call");
45 return _age_table;
46 }
47
48 void ShenandoahEvacuationStats::begin_evacuation(size_t bytes) {
49 ++_evacuations_attempted;
50 _bytes_attempted += bytes;
51 }
52
53 void ShenandoahEvacuationStats::end_evacuation(size_t bytes) {
54 ++_evacuations_completed;
55 _bytes_completed += bytes;
56 }
57
58 void ShenandoahEvacuationStats::record_age(size_t bytes, uint age) {
59 assert(_use_age_table, "Don't call!");
60 _age_table->add(age, bytes >> LogBytesPerWord);
61 }
62
63 void ShenandoahEvacuationStats::accumulate(const ShenandoahEvacuationStats* other) {
64 _evacuations_completed += other->_evacuations_completed;
65 _bytes_completed += other->_bytes_completed;
66 _evacuations_attempted += other->_evacuations_attempted;
67 _bytes_attempted += other->_bytes_attempted;
68 if (_use_age_table) {
69 _age_table->merge(other->age_table());
70 }
71 }
72
73 void ShenandoahEvacuationStats::reset() {
74 _evacuations_completed = _evacuations_attempted = 0;
75 _bytes_completed = _bytes_attempted = 0;
76 if (_use_age_table) {
77 _age_table->clear();
78 }
79 }
80
81 void ShenandoahEvacuationStats::print_on(outputStream* st) {
82 size_t abandoned_size = _bytes_attempted - _bytes_completed;
83 size_t abandoned_count = _evacuations_attempted - _evacuations_completed;
84 st->print_cr("Evacuated " SIZE_FORMAT "%s across " SIZE_FORMAT " objects, "
85 "abandoned " SIZE_FORMAT "%s across " SIZE_FORMAT " objects.",
86 byte_size_in_proper_unit(_bytes_completed), proper_unit_for_byte_size(_bytes_completed),
87 _evacuations_completed,
88 byte_size_in_proper_unit(abandoned_size), proper_unit_for_byte_size(abandoned_size),
89 abandoned_count);
90 if (_use_age_table) {
91 _age_table->print_on(st, ShenandoahHeap::heap()->age_census()->tenuring_threshold());
92 }
93 }
94
95 void ShenandoahEvacuationTracker::print_global_on(outputStream* st) {
96 print_evacuations_on(st, &_workers_global, &_mutators_global);
97 }
98
99 void ShenandoahEvacuationTracker::print_evacuations_on(outputStream* st,
100 ShenandoahEvacuationStats* workers,
101 ShenandoahEvacuationStats* mutators) {
102 st->print("Workers: ");
103 workers->print_on(st);
104 st->cr();
105 st->print("Mutators: ");
106 mutators->print_on(st);
107 st->cr();
108
109 ShenandoahHeap* heap = ShenandoahHeap::heap();
110 if (_generational) {
111 AgeTable young_region_ages(false);
112 for (uint i = 0; i < heap->num_regions(); ++i) {
113 ShenandoahHeapRegion* r = heap->get_region(i);
114 if (r->is_young()) {
115 young_region_ages.add(r->age(), r->get_live_data_words());
116 }
117 }
118 uint tenuring_threshold = heap->age_census()->tenuring_threshold();
119 st->print("Young regions: ");
120 young_region_ages.print_on(st, tenuring_threshold);
121 st->cr();
122 }
123 }
124
125 class ShenandoahStatAggregator : public ThreadClosure {
126 public:
127 ShenandoahEvacuationStats* _target;
128 explicit ShenandoahStatAggregator(ShenandoahEvacuationStats* target) : _target(target) {}
129 virtual void do_thread(Thread* thread) override {
130 ShenandoahEvacuationStats* local = ShenandoahThreadLocalData::evacuation_stats(thread);
131 _target->accumulate(local);
132 local->reset();
133 }
134 };
135
136 ShenandoahCycleStats ShenandoahEvacuationTracker::flush_cycle_to_global() {
137 ShenandoahEvacuationStats mutators(_generational), workers(_generational);
138
139 ThreadsListHandle java_threads_iterator;
140 ShenandoahStatAggregator aggregate_mutators(&mutators);
141 java_threads_iterator.list()->threads_do(&aggregate_mutators);
142
143 ShenandoahStatAggregator aggregate_workers(&workers);
144 ShenandoahHeap::heap()->gc_threads_do(&aggregate_workers);
145
146 _mutators_global.accumulate(&mutators);
147 _workers_global.accumulate(&workers);
148
149 if (_generational && (ShenandoahGenerationalCensusAtEvac || !ShenandoahGenerationalAdaptiveTenuring)) {
150 // Ingest population vectors into the heap's global census
151 // data, and use it to compute an appropriate tenuring threshold
152 // for use in the next cycle.
153 ShenandoahAgeCensus* census = ShenandoahHeap::heap()->age_census();
154 census->prepare_for_census_update();
155 // The first argument is used for any age 0 cohort population that we may otherwise have
156 // missed during the census. This is non-zero only when census happens at marking.
157 census->update_census(0, _mutators_global.age_table(), _workers_global.age_table());
158 }
159
160 return {workers, mutators};
161 }
162
163 void ShenandoahEvacuationTracker::begin_evacuation(Thread* thread, size_t bytes) {
164 ShenandoahThreadLocalData::begin_evacuation(thread, bytes);
165 }
166
167 void ShenandoahEvacuationTracker::end_evacuation(Thread* thread, size_t bytes) {
168 ShenandoahThreadLocalData::end_evacuation(thread, bytes);
169 }
170
171 void ShenandoahEvacuationTracker::record_age(Thread* thread, size_t bytes, uint age) {
172 ShenandoahThreadLocalData::record_age(thread, bytes, age);
173 }