1 /*
2 * Copyright (c) 2015, 2017, 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/arguments.hpp"
27 #include "runtime/commandLineFlagConstraintsRuntime.hpp"
28 #include "runtime/commandLineFlagRangeList.hpp"
29 #include "runtime/globals.hpp"
30 #include "runtime/safepointMechanism.hpp"
31 #include "runtime/task.hpp"
32 #include "utilities/defaultStream.hpp"
33
34 Flag::Error ObjectAlignmentInBytesConstraintFunc(intx value, bool verbose) {
35 if (!is_power_of_2(value)) {
36 CommandLineError::print(verbose,
37 "ObjectAlignmentInBytes (" INTX_FORMAT ") must be "
38 "power of 2\n",
39 value);
40 return Flag::VIOLATES_CONSTRAINT;
41 }
42 // In case page size is very small.
43 if (value >= (intx)os::vm_page_size()) {
44 CommandLineError::print(verbose,
45 "ObjectAlignmentInBytes (" INTX_FORMAT ") must be "
46 "less than page size (" INTX_FORMAT ")\n",
47 value, (intx)os::vm_page_size());
48 return Flag::VIOLATES_CONSTRAINT;
49 }
50 return Flag::SUCCESS;
51 }
52
53 // Need to enforce the padding not to break the existing field alignments.
54 // It is sufficient to check against the largest type size.
55 Flag::Error ContendedPaddingWidthConstraintFunc(intx value, bool verbose) {
56 if ((value % BytesPerLong) != 0) {
57 CommandLineError::print(verbose,
58 "ContendedPaddingWidth (" INTX_FORMAT ") must be "
59 "a multiple of %d\n",
60 value, BytesPerLong);
61 return Flag::VIOLATES_CONSTRAINT;
62 } else {
63 return Flag::SUCCESS;
64 }
65 }
66
67 Flag::Error BiasedLockingBulkRebiasThresholdFunc(intx value, bool verbose) {
68 if (value > BiasedLockingBulkRevokeThreshold) {
69 CommandLineError::print(verbose,
70 "BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ") must be "
71 "less than or equal to BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ")\n",
72 value, BiasedLockingBulkRevokeThreshold);
73 return Flag::VIOLATES_CONSTRAINT;
74 } else {
75 return Flag::SUCCESS;
76 }
77 }
78
79 Flag::Error BiasedLockingStartupDelayFunc(intx value, bool verbose) {
80 if ((value % PeriodicTask::interval_gran) != 0) {
81 CommandLineError::print(verbose,
82 "BiasedLockingStartupDelay (" INTX_FORMAT ") must be "
83 "evenly divisible by PeriodicTask::interval_gran (" INTX_FORMAT ")\n",
84 value, PeriodicTask::interval_gran);
85 return Flag::VIOLATES_CONSTRAINT;
86 } else {
87 return Flag::SUCCESS;
88 }
89 }
90
91 Flag::Error BiasedLockingBulkRevokeThresholdFunc(intx value, bool verbose) {
92 if (value < BiasedLockingBulkRebiasThreshold) {
93 CommandLineError::print(verbose,
94 "BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ") must be "
95 "greater than or equal to BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ")\n",
96 value, BiasedLockingBulkRebiasThreshold);
97 return Flag::VIOLATES_CONSTRAINT;
98 } else if ((double)value/(double)BiasedLockingDecayTime > 0.1) {
99 CommandLineError::print(verbose,
100 "The ratio of BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ")"
101 " to BiasedLockingDecayTime (" INTX_FORMAT ") must be "
102 "less than or equal to 0.1\n",
103 value, BiasedLockingBulkRebiasThreshold);
104 return Flag::VIOLATES_CONSTRAINT;
105 } else {
106 return Flag::SUCCESS;
107 }
108 }
109
110 Flag::Error BiasedLockingDecayTimeFunc(intx value, bool verbose) {
111 if (BiasedLockingBulkRebiasThreshold/(double)value > 0.1) {
112 CommandLineError::print(verbose,
113 "The ratio of BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ")"
114 " to BiasedLockingDecayTime (" INTX_FORMAT ") must be "
115 "less than or equal to 0.1\n",
116 BiasedLockingBulkRebiasThreshold, value);
117 return Flag::VIOLATES_CONSTRAINT;
118 } else {
119 return Flag::SUCCESS;
120 }
121 }
122
123 Flag::Error PerfDataSamplingIntervalFunc(intx value, bool verbose) {
124 if ((value % PeriodicTask::interval_gran != 0)) {
125 CommandLineError::print(verbose,
126 "PerfDataSamplingInterval (" INTX_FORMAT ") must be "
127 "evenly divisible by PeriodicTask::interval_gran (" INTX_FORMAT ")\n",
128 value, PeriodicTask::interval_gran);
129 return Flag::VIOLATES_CONSTRAINT;
130 } else {
131 return Flag::SUCCESS;
132 }
133 }
134
135 Flag::Error ThreadLocalHandshakesConstraintFunc(bool value, bool verbose) {
136 if (value) {
137 if (!SafepointMechanism::supports_thread_local_poll()) {
138 CommandLineError::print(verbose, "ThreadLocalHandshakes not yet supported on this platform\n");
139 return Flag::VIOLATES_CONSTRAINT;
140 }
141 }
142 return Flag::SUCCESS;
143 }