1 /*
2 * Copyright (c) 2013, 2021, Red Hat, Inc. 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
25 #include "precompiled.hpp"
26
27 #include "gc/shenandoah/shenandoahCollectorPolicy.hpp"
28 #include "gc/shenandoah/shenandoahGC.hpp"
29 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
30 #include "runtime/os.hpp"
31
32 ShenandoahCollectorPolicy::ShenandoahCollectorPolicy() :
33 _success_concurrent_gcs(0),
34 _success_degenerated_gcs(0),
35 _success_full_gcs(0),
36 _alloc_failure_degenerated(0),
37 _alloc_failure_degenerated_upgrade_to_full(0),
38 _alloc_failure_full(0),
39 _explicit_concurrent(0),
40 _explicit_full(0),
41 _implicit_concurrent(0),
42 _implicit_full(0),
43 _cycle_counter(0) {
44
45 Copy::zero_to_bytes(_degen_points, sizeof(size_t) * ShenandoahGC::_DEGENERATED_LIMIT);
46
47 _tracer = new ShenandoahTracer();
48
49 }
50
51 void ShenandoahCollectorPolicy::record_explicit_to_concurrent() {
52 _explicit_concurrent++;
53 }
54
55 void ShenandoahCollectorPolicy::record_explicit_to_full() {
56 _explicit_full++;
57 }
58
59 void ShenandoahCollectorPolicy::record_implicit_to_concurrent() {
60 _implicit_concurrent++;
61 }
62
63 void ShenandoahCollectorPolicy::record_implicit_to_full() {
64 _implicit_full++;
65 }
66
67 void ShenandoahCollectorPolicy::record_alloc_failure_to_full() {
68 _alloc_failure_full++;
69 }
70
71 void ShenandoahCollectorPolicy::record_alloc_failure_to_degenerated(ShenandoahGC::ShenandoahDegenPoint point) {
72 assert(point < ShenandoahGC::_DEGENERATED_LIMIT, "sanity");
73 _alloc_failure_degenerated++;
74 _degen_points[point]++;
75 }
76
77 void ShenandoahCollectorPolicy::record_degenerated_upgrade_to_full() {
78 _alloc_failure_degenerated_upgrade_to_full++;
79 }
80
81 void ShenandoahCollectorPolicy::record_success_concurrent() {
82 _success_concurrent_gcs++;
83 }
84
85 void ShenandoahCollectorPolicy::record_success_degenerated() {
86 _success_degenerated_gcs++;
87 }
88
89 void ShenandoahCollectorPolicy::record_success_full() {
90 _success_full_gcs++;
91 }
92
93 size_t ShenandoahCollectorPolicy::cycle_counter() const {
94 return _cycle_counter;
95 }
96
97 void ShenandoahCollectorPolicy::record_cycle_start() {
98 _cycle_counter++;
99 }
100
101 void ShenandoahCollectorPolicy::record_shutdown() {
102 _in_shutdown.set();
103 }
104
105 bool ShenandoahCollectorPolicy::is_at_shutdown() {
106 return _in_shutdown.is_set();
107 }
108
109 void ShenandoahCollectorPolicy::print_gc_stats(outputStream* out) const {
110 out->print_cr("Under allocation pressure, concurrent cycles may cancel, and either continue cycle");
111 out->print_cr("under stop-the-world pause or result in stop-the-world Full GC. Increase heap size,");
112 out->print_cr("tune GC heuristics, set more aggressive pacing delay, or lower allocation rate");
113 out->print_cr("to avoid Degenerated and Full GC cycles.");
114 out->cr();
115
116 out->print_cr(SIZE_FORMAT_W(5) " successful concurrent GCs", _success_concurrent_gcs);
117 out->print_cr(" " SIZE_FORMAT_W(5) " invoked explicitly", _explicit_concurrent);
118 out->print_cr(" " SIZE_FORMAT_W(5) " invoked implicitly", _implicit_concurrent);
119 out->cr();
120
121 out->print_cr(SIZE_FORMAT_W(5) " Degenerated GCs", _success_degenerated_gcs);
122 out->print_cr(" " SIZE_FORMAT_W(5) " caused by allocation failure", _alloc_failure_degenerated);
123 for (int c = 0; c < ShenandoahGC::_DEGENERATED_LIMIT; c++) {
124 if (_degen_points[c] > 0) {
125 const char* desc = ShenandoahGC::degen_point_to_string((ShenandoahGC::ShenandoahDegenPoint)c);
126 out->print_cr(" " SIZE_FORMAT_W(5) " happened at %s", _degen_points[c], desc);
127 }
128 }
129 out->print_cr(" " SIZE_FORMAT_W(5) " upgraded to Full GC", _alloc_failure_degenerated_upgrade_to_full);
130 out->cr();
131
132 out->print_cr(SIZE_FORMAT_W(5) " Full GCs", _success_full_gcs + _alloc_failure_degenerated_upgrade_to_full);
133 out->print_cr(" " SIZE_FORMAT_W(5) " invoked explicitly", _explicit_full);
134 out->print_cr(" " SIZE_FORMAT_W(5) " invoked implicitly", _implicit_full);
135 out->print_cr(" " SIZE_FORMAT_W(5) " caused by allocation failure", _alloc_failure_full);
136 out->print_cr(" " SIZE_FORMAT_W(5) " upgraded from Degenerated GC", _alloc_failure_degenerated_upgrade_to_full);
137 }