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 ObjectAlignmentInBytesConstraintFunc(int value, bool verbose) {
36 if (!is_power_of_2(value)) {
37 JVMFlag::printError(verbose,
38 "ObjectAlignmentInBytes (%d) must be "
39 "power of 2\n",
40 value);
41 return JVMFlag::VIOLATES_CONSTRAINT;
42 }
43 // In case page size is very small.
44 if (value >= (intx)os::vm_page_size()) {
45 JVMFlag::printError(verbose,
46 "ObjectAlignmentInBytes (%d) must be "
47 "less than page size (" SIZE_FORMAT ")\n",
48 value, os::vm_page_size());
49 return JVMFlag::VIOLATES_CONSTRAINT;
50 }
51 return JVMFlag::SUCCESS;
52 }
53
54 // Need to enforce the padding not to break the existing field alignments.
55 // It is sufficient to check against the largest type size.
56 JVMFlag::Error ContendedPaddingWidthConstraintFunc(int value, bool verbose) {
57 if ((value % BytesPerLong) != 0) {
58 JVMFlag::printError(verbose,
59 "ContendedPaddingWidth (%d) must be "
60 "a multiple of %d\n",
61 value, BytesPerLong);
62 return JVMFlag::VIOLATES_CONSTRAINT;
63 } else {
64 return JVMFlag::SUCCESS;
65 }
66 }
67
68 JVMFlag::Error PerfDataSamplingIntervalFunc(int value, bool verbose) {
69 if ((value % PeriodicTask::interval_gran != 0)) {
70 JVMFlag::printError(verbose,
71 "PerfDataSamplingInterval (%d) must be "
72 "evenly divisible by PeriodicTask::interval_gran (%d)\n",
73 value, PeriodicTask::interval_gran);
74 return JVMFlag::VIOLATES_CONSTRAINT;
75 } else {
76 return JVMFlag::SUCCESS;
77 }
78 }
79
80 JVMFlag::Error VMPageSizeConstraintFunc(uintx value, bool verbose) {
81 uintx min = (uintx)os::vm_page_size();
82 if (value < min) {
83 JVMFlag::printError(verbose,
84 "%s %s=" UINTX_FORMAT " is outside the allowed range [ " UINTX_FORMAT
85 " ... " UINTX_FORMAT " ]\n",
86 JVMFlagLimit::last_checked_flag()->type_string(),
87 JVMFlagLimit::last_checked_flag()->name(),
88 value, min, max_uintx);
89 return JVMFlag::VIOLATES_CONSTRAINT;
90 }
91
92 return JVMFlag::SUCCESS;
93 }
94
95 JVMFlag::Error NUMAInterleaveGranularityConstraintFunc(size_t value, bool verbose) {
96 size_t min = os::vm_allocation_granularity();
97 size_t max = NOT_LP64(2*G) LP64_ONLY(8192*G);
98
99 if (value < min || value > max) {
100 JVMFlag::printError(verbose,
101 "size_t NUMAInterleaveGranularity=" UINTX_FORMAT " is outside the allowed range [ " UINTX_FORMAT
102 " ... " UINTX_FORMAT " ]\n", value, min, max);
103 return JVMFlag::VIOLATES_CONSTRAINT;
104 }
105
106 return JVMFlag::SUCCESS;
107 }