1 /*
2 * Copyright (c) 2015, 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
25 #include "precompiled.hpp"
26 #include "runtime/flags/jvmFlag.hpp"
27 #include "runtime/flags/jvmFlagLimit.hpp"
28 #include "runtime/flags/jvmFlagConstraintsRuntime.hpp"
29 #include "runtime/globals.hpp"
30 #include "runtime/os.hpp"
31 #include "runtime/safepointMechanism.hpp"
32 #include "runtime/task.hpp"
33 #include "utilities/powerOfTwo.hpp"
34
35 JVMFlag::Error AOTModeConstraintFunc(ccstr value, bool verbose) {
36 if (strcmp(value, "off") != 0 &&
37 strcmp(value, "record") != 0 &&
38 strcmp(value, "create") != 0 &&
39 strcmp(value, "auto") != 0 &&
40 strcmp(value, "on")) {
41 JVMFlag::printError(verbose,
42 "Unrecognized value %s for AOTMode. Must be one of the following: "
43 "off, record, create, auto, on\n",
44 value);
45 return JVMFlag::VIOLATES_CONSTRAINT;
46 }
47
48 return JVMFlag::SUCCESS;
49 }
50 JVMFlag::Error ObjectAlignmentInBytesConstraintFunc(int value, bool verbose) {
51 if (!is_power_of_2(value)) {
52 JVMFlag::printError(verbose,
53 "ObjectAlignmentInBytes (%d) must be "
54 "power of 2\n",
55 value);
56 return JVMFlag::VIOLATES_CONSTRAINT;
57 }
58 // In case page size is very small.
59 if (value >= (intx)os::vm_page_size()) {
60 JVMFlag::printError(verbose,
61 "ObjectAlignmentInBytes (%d) must be "
62 "less than page size (" SIZE_FORMAT ")\n",
63 value, os::vm_page_size());
64 return JVMFlag::VIOLATES_CONSTRAINT;
65 }
66 return JVMFlag::SUCCESS;
67 }
68
69 // Need to enforce the padding not to break the existing field alignments.
70 // It is sufficient to check against the largest type size.
71 JVMFlag::Error ContendedPaddingWidthConstraintFunc(int value, bool verbose) {
72 if ((value % BytesPerLong) != 0) {
73 JVMFlag::printError(verbose,
74 "ContendedPaddingWidth (%d) must be "
75 "a multiple of %d\n",
76 value, BytesPerLong);
77 return JVMFlag::VIOLATES_CONSTRAINT;
78 } else {
79 return JVMFlag::SUCCESS;
80 }
81 }
82
83 JVMFlag::Error PerfDataSamplingIntervalFunc(int value, bool verbose) {
84 if ((value % PeriodicTask::interval_gran != 0)) {
85 JVMFlag::printError(verbose,
86 "PerfDataSamplingInterval (%d) must be "
87 "evenly divisible by PeriodicTask::interval_gran (%d)\n",
88 value, PeriodicTask::interval_gran);
89 return JVMFlag::VIOLATES_CONSTRAINT;
90 } else {
91 return JVMFlag::SUCCESS;
92 }
93 }
94
95 JVMFlag::Error VMPageSizeConstraintFunc(uintx value, bool verbose) {
96 uintx min = (uintx)os::vm_page_size();
97 if (value < min) {
98 JVMFlag::printError(verbose,
99 "%s %s=" UINTX_FORMAT " is outside the allowed range [ " UINTX_FORMAT
100 " ... " UINTX_FORMAT " ]\n",
101 JVMFlagLimit::last_checked_flag()->type_string(),
102 JVMFlagLimit::last_checked_flag()->name(),
103 value, min, max_uintx);
104 return JVMFlag::VIOLATES_CONSTRAINT;
105 }
106
107 return JVMFlag::SUCCESS;
108 }
109
110 JVMFlag::Error NUMAInterleaveGranularityConstraintFunc(size_t value, bool verbose) {
111 size_t min = os::vm_allocation_granularity();
112 size_t max = NOT_LP64(2*G) LP64_ONLY(8192*G);
113
114 if (value < min || value > max) {
115 JVMFlag::printError(verbose,
116 "size_t NUMAInterleaveGranularity=" UINTX_FORMAT " is outside the allowed range [ " UINTX_FORMAT
117 " ... " UINTX_FORMAT " ]\n", value, min, max);
118 return JVMFlag::VIOLATES_CONSTRAINT;
119 }
120
121 return JVMFlag::SUCCESS;
122 }