1/*
2 * Copyright (c) 2015, 2018, 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
25#include "precompiled.hpp"
26#include "gc/g1/heapRegionBounds.inline.hpp"
27#include "gc/g1/jvmFlagConstraintsG1.hpp"
28#include "runtime/globals_extension.hpp"
29#include "utilities/globalDefinitions.hpp"
30
31JVMFlag::Error G1RSetRegionEntriesConstraintFunc(intx value, bool verbose) {
32 if (!UseG1GC) return JVMFlag::SUCCESS;
33
34 // Default value of G1RSetRegionEntries=0 means will be set ergonomically.
35 // Minimum value is 1.
36 if (FLAG_IS_CMDLINE(G1RSetRegionEntries) && (value < 1)) {
37 JVMFlag::printError(verbose,
38 "G1RSetRegionEntries (" INTX_FORMAT ") must be "
39 "greater than or equal to 1\n",
40 value);
41 return JVMFlag::VIOLATES_CONSTRAINT;
42 } else {
43 return JVMFlag::SUCCESS;
44 }
45}
46
47JVMFlag::Error G1RSetSparseRegionEntriesConstraintFunc(intx value, bool verbose) {
48 if (!UseG1GC) return JVMFlag::SUCCESS;
49
50 // Default value of G1RSetSparseRegionEntries=0 means will be set ergonomically.
51 // Minimum value is 1.
52 if (FLAG_IS_CMDLINE(G1RSetSparseRegionEntries) && (value < 1)) {
53 JVMFlag::printError(verbose,
54 "G1RSetSparseRegionEntries (" INTX_FORMAT ") must be "
55 "greater than or equal to 1\n",
56 value);
57 return JVMFlag::VIOLATES_CONSTRAINT;
58 } else {
59 return JVMFlag::SUCCESS;
60 }
61}
62
63JVMFlag::Error G1HeapRegionSizeConstraintFunc(size_t value, bool verbose) {
64 if (!UseG1GC) return JVMFlag::SUCCESS;
65
66 // Default value of G1HeapRegionSize=0 means will be set ergonomically.
67 if (FLAG_IS_CMDLINE(G1HeapRegionSize) && (value < HeapRegionBounds::min_size())) {
68 JVMFlag::printError(verbose,
69 "G1HeapRegionSize (" SIZE_FORMAT ") must be "
70 "greater than or equal to ergonomic heap region minimum size\n",
71 value);
72 return JVMFlag::VIOLATES_CONSTRAINT;
73 } else {
74 return JVMFlag::SUCCESS;
75 }
76}
77
78JVMFlag::Error G1NewSizePercentConstraintFunc(uintx value, bool verbose) {
79 if (!UseG1GC) return JVMFlag::SUCCESS;
80
81 if (value > G1MaxNewSizePercent) {
82 JVMFlag::printError(verbose,
83 "G1NewSizePercent (" UINTX_FORMAT ") must be "
84 "less than or equal to G1MaxNewSizePercent (" UINTX_FORMAT ")\n",
85 value, G1MaxNewSizePercent);
86 return JVMFlag::VIOLATES_CONSTRAINT;
87 } else {
88 return JVMFlag::SUCCESS;
89 }
90}
91
92JVMFlag::Error G1MaxNewSizePercentConstraintFunc(uintx value, bool verbose) {
93 if (!UseG1GC) return JVMFlag::SUCCESS;
94
95 if (value < G1NewSizePercent) {
96 JVMFlag::printError(verbose,
97 "G1MaxNewSizePercent (" UINTX_FORMAT ") must be "
98 "greater than or equal to G1NewSizePercent (" UINTX_FORMAT ")\n",
99 value, G1NewSizePercent);
100 return JVMFlag::VIOLATES_CONSTRAINT;
101 } else {
102 return JVMFlag::SUCCESS;
103 }
104}
105
106JVMFlag::Error MaxGCPauseMillisConstraintFuncG1(uintx value, bool verbose) {
107 if (UseG1GC && FLAG_IS_CMDLINE(MaxGCPauseMillis) && (value >= GCPauseIntervalMillis)) {
108 JVMFlag::printError(verbose,
109 "MaxGCPauseMillis (" UINTX_FORMAT ") must be "
110 "less than GCPauseIntervalMillis (" UINTX_FORMAT ")\n",
111 value, GCPauseIntervalMillis);
112 return JVMFlag::VIOLATES_CONSTRAINT;
113 }
114
115 return JVMFlag::SUCCESS;
116}
117
118JVMFlag::Error GCPauseIntervalMillisConstraintFuncG1(uintx value, bool verbose) {
119 if (UseG1GC) {
120 if (FLAG_IS_CMDLINE(GCPauseIntervalMillis)) {
121 if (value < 1) {
122 JVMFlag::printError(verbose,
123 "GCPauseIntervalMillis (" UINTX_FORMAT ") must be "
124 "greater than or equal to 1\n",
125 value);
126 return JVMFlag::VIOLATES_CONSTRAINT;
127 }
128
129 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
130 JVMFlag::printError(verbose,
131 "GCPauseIntervalMillis cannot be set "
132 "without setting MaxGCPauseMillis\n");
133 return JVMFlag::VIOLATES_CONSTRAINT;
134 }
135
136 if (value <= MaxGCPauseMillis) {
137 JVMFlag::printError(verbose,
138 "GCPauseIntervalMillis (" UINTX_FORMAT ") must be "
139 "greater than MaxGCPauseMillis (" UINTX_FORMAT ")\n",
140 value, MaxGCPauseMillis);
141 return JVMFlag::VIOLATES_CONSTRAINT;
142 }
143 }
144 }
145
146 return JVMFlag::SUCCESS;
147}
148
149JVMFlag::Error NewSizeConstraintFuncG1(size_t value, bool verbose) {
150#ifdef _LP64
151 // Overflow would happen for uint type variable of YoungGenSizer::_min_desired_young_length
152 // when the value to be assigned exceeds uint range.
153 // i.e. result of '(uint)(NewSize / region size(1~32MB))'
154 // So maximum of NewSize should be 'max_juint * 1M'
155 if (UseG1GC && (value > (max_juint * 1 * M))) {
156 JVMFlag::printError(verbose,
157 "NewSize (" SIZE_FORMAT ") must be less than ergonomic maximum value\n",
158 value);
159 return JVMFlag::VIOLATES_CONSTRAINT;
160 }
161#endif // _LP64
162 return JVMFlag::SUCCESS;
163}
164
165size_t MaxSizeForHeapAlignmentG1() {
166 return HeapRegionBounds::max_size();
167}
168