1 /*
2 * Copyright (c) 2012, 2023, 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
21 * questions.
22 *
23 */
24 #include "precompiled.hpp"
25 #include "gc/shared/collectedHeap.hpp"
26 #include "gc/shared/gc_globals.hpp"
27 #include "gc/shared/gcArguments.hpp"
28 #include "gc/shared/gcConfiguration.hpp"
29 #include "gc/shared/tlab_globals.hpp"
30 #include "memory/universe.hpp"
31 #include "oops/compressedOops.hpp"
32 #include "runtime/globals.hpp"
33 #include "runtime/globals_extension.hpp"
34 #include "utilities/debug.hpp"
35 #include "utilities/macros.hpp"
36
37 GCName GCConfiguration::young_collector() const {
38 if (UseG1GC) {
39 return G1New;
40 }
41
42 if (UseParallelGC) {
43 return ParallelScavenge;
44 }
45
46 if (UseShenandoahGC) {
47 #if INCLUDE_SHENANDOAHGC
48 if (strcmp(ShenandoahGCMode, "generational") == 0) {
49 return Shenandoah;
50 }
51 #endif
52 return NA;
53 }
54
55 if (UseZGC) {
56 if (ZGenerational) {
57 return ZMinor;
58 } else {
59 return NA;
60 }
61 }
62 return DefNew;
63 }
64
65 GCName GCConfiguration::old_collector() const {
66 if (UseG1GC) {
67 return G1Old;
68 }
69
70 if (UseParallelGC) {
71 return ParallelOld;
72 }
73
74 if (UseShenandoahGC) {
75 #if INCLUDE_SHENANDOAHGC
76 if (strcmp(ShenandoahGCMode, "generational") == 0) {
77 return Shenandoah;
78 }
79 #endif
80 return NA;
81 }
82
83 if (UseZGC) {
84 if (ZGenerational) {
85 return ZMajor;
86 } else {
87 return Z;
88 }
89 }
90 return SerialOld;
91 }
92
93 uint GCConfiguration::num_parallel_gc_threads() const {
94 return ParallelGCThreads;
95 }
96
97 uint GCConfiguration::num_concurrent_gc_threads() const {
98 return ConcGCThreads;
99 }
100
101 bool GCConfiguration::uses_dynamic_gc_threads() const {
102 return UseDynamicNumberOfGCThreads;
103 }
104
105 bool GCConfiguration::is_explicit_gc_concurrent() const {
106 return ExplicitGCInvokesConcurrent;
107 }
108
109 bool GCConfiguration::is_explicit_gc_disabled() const {
110 return DisableExplicitGC;
111 }
112
113 bool GCConfiguration::has_pause_target_default_value() const {
114 return FLAG_IS_DEFAULT(MaxGCPauseMillis);
115 }
116
117 uintx GCConfiguration::pause_target() const {
118 return MaxGCPauseMillis;
119 }
120
121 uintx GCConfiguration::gc_time_ratio() const {
122 return GCTimeRatio;
123 }
124
125 bool GCTLABConfiguration::uses_tlabs() const {
126 return UseTLAB;
127 }
128
129 size_t GCTLABConfiguration::min_tlab_size() const {
130 return MinTLABSize;
131 }
132
133 uint GCTLABConfiguration::tlab_refill_waste_limit() const {
134 return TLABRefillWasteFraction;
135 }
136
137 intx GCSurvivorConfiguration::max_tenuring_threshold() const {
138 return MaxTenuringThreshold;
139 }
140
141 intx GCSurvivorConfiguration::initial_tenuring_threshold() const {
142 return InitialTenuringThreshold;
143 }
144
145 size_t GCHeapConfiguration::max_size() const {
146 return MaxHeapSize;
147 }
148
149 size_t GCHeapConfiguration::min_size() const {
150 return MinHeapSize;
151 }
152
153 size_t GCHeapConfiguration::initial_size() const {
154 return InitialHeapSize;
155 }
156
157 bool GCHeapConfiguration::uses_compressed_oops() const {
158 return UseCompressedOops;
159 }
160
161 CompressedOops::Mode GCHeapConfiguration::narrow_oop_mode() const {
162 return CompressedOops::mode();
163 }
164
165 uint GCHeapConfiguration::object_alignment_in_bytes() const {
166 return ObjectAlignmentInBytes;
167 }
168
169 int GCHeapConfiguration::heap_address_size_in_bits() const {
170 return BitsPerHeapOop;
171 }
172
173 bool GCYoungGenerationConfiguration::has_max_size_default_value() const {
174 return FLAG_IS_DEFAULT(MaxNewSize);
175 }
176
177 uintx GCYoungGenerationConfiguration::max_size() const {
178 return MaxNewSize;
179 }
180
181 uintx GCYoungGenerationConfiguration::min_size() const {
182 return NewSize;
183 }
184
185 intx GCYoungGenerationConfiguration::new_ratio() const {
186 return NewRatio;
187 }