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 "runtime/threadSMR.inline.hpp"
31 #include "runtime/thread.hpp"
32
33 ShenandoahEvacuationStats::ShenandoahEvacuationStats()
34 : _evacuations_completed(0), _bytes_completed(0),
35 _evacuations_attempted(0), _bytes_attempted(0),
36 _use_age_table(ShenandoahGenerationalCensusAtEvac || !ShenandoahGenerationalAdaptiveTenuring),
37 _age_table(nullptr) {
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 if (age <= markWord::max_age) { // Filter age sentinel.
61 _age_table->add(age, bytes >> LogBytesPerWord);
62 }
63 }
64
65 void ShenandoahEvacuationStats::accumulate(const ShenandoahEvacuationStats* other) {
66 _evacuations_completed += other->_evacuations_completed;
67 _bytes_completed += other->_bytes_completed;
68 _evacuations_attempted += other->_evacuations_attempted;
69 _bytes_attempted += other->_bytes_attempted;
70 if (_use_age_table) {
71 _age_table->merge(other->age_table());
72 }
73 }
74
75 void ShenandoahEvacuationStats::reset() {
76 _evacuations_completed = _evacuations_attempted = 0;
77 _bytes_completed = _bytes_attempted = 0;
78 if (_use_age_table) {
79 _age_table->clear();
80 }
81 }
82
83 void ShenandoahEvacuationStats::print_on(outputStream* st) {
84 #ifndef PRODUCT
85 size_t abandoned_size = _bytes_attempted - _bytes_completed;
86 size_t abandoned_count = _evacuations_attempted - _evacuations_completed;
87 st->print_cr("Evacuated " SIZE_FORMAT "%s across " SIZE_FORMAT " objects, "
88 "abandoned " SIZE_FORMAT "%s across " SIZE_FORMAT " objects.",
89 byte_size_in_proper_unit(_bytes_completed), proper_unit_for_byte_size(_bytes_completed),
90 _evacuations_completed,
91 byte_size_in_proper_unit(abandoned_size), proper_unit_for_byte_size(abandoned_size),
92 abandoned_count);
93 #endif
94 if (_use_age_table) {
95 _age_table->print_on(st);
96 }
97 }
98
99 void ShenandoahEvacuationTracker::print_global_on(outputStream* st) {
100 print_evacuations_on(st, &_workers_global, &_mutators_global);
101 }
102
103 void ShenandoahEvacuationTracker::print_evacuations_on(outputStream* st,
104 ShenandoahEvacuationStats* workers,
105 ShenandoahEvacuationStats* mutators) {
106 st->print("Workers: ");
107 workers->print_on(st);
108 st->cr();
109 st->print("Mutators: ");
110 mutators->print_on(st);
111 st->cr();
112
113 ShenandoahHeap* heap = ShenandoahHeap::heap();
114
115 AgeTable young_region_ages(false);
116 for (uint i = 0; i < heap->num_regions(); ++i) {
117 ShenandoahHeapRegion* r = heap->get_region(i);
118 if (r->is_young()) {
119 young_region_ages.add(r->age(), r->get_live_data_words());
120 }
121 }
122 st->print("Young regions: ");
123 young_region_ages.print_on(st);
124 st->cr();
125 }
126
127 class ShenandoahStatAggregator : public ThreadClosure {
128 public:
129 ShenandoahEvacuationStats* _target;
130 explicit ShenandoahStatAggregator(ShenandoahEvacuationStats* target) : _target(target) {}
131 void do_thread(Thread* thread) override {
132 ShenandoahEvacuationStats* local = ShenandoahThreadLocalData::evacuation_stats(thread);
133 _target->accumulate(local);
134 local->reset();
135 }
136 };
137
138 ShenandoahCycleStats ShenandoahEvacuationTracker::flush_cycle_to_global() {
139 ShenandoahEvacuationStats mutators, workers;
140
141 ThreadsListHandle java_threads_iterator;
142 ShenandoahStatAggregator aggregate_mutators(&mutators);
143 java_threads_iterator.list()->threads_do(&aggregate_mutators);
144
145 ShenandoahStatAggregator aggregate_workers(&workers);
146 ShenandoahHeap::heap()->gc_threads_do(&aggregate_workers);
147
148 _mutators_global.accumulate(&mutators);
149 _workers_global.accumulate(&workers);
150
151 if (ShenandoahGenerationalCensusAtEvac || !ShenandoahGenerationalAdaptiveTenuring) {
152 // Ingest mutator & worker collected population vectors into the heap's
153 // global census data, and use it to compute an appropriate tenuring threshold
154 // for use in the next cycle.
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 ShenandoahGenerationalHeap::heap()->age_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 }