1 /*
2 * Copyright (c) 2014, 2022, 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 * @test
26 * @bug 8031320
27 * @summary Verify that RTMSpinLoopCount affects time spent
28 * between locking attempts.
29 * @library /test/lib /
30 * @modules java.base/jdk.internal.misc
31 * java.management
32 * @requires vm.rtm.cpu & vm.rtm.compiler
33 * @build jdk.test.whitebox.WhiteBox
34 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
35 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
36 * -XX:+WhiteBoxAPI
37 * compiler.rtm.locking.TestRTMSpinLoopCount
38 */
39
40 package compiler.rtm.locking;
41
42 import compiler.testlibrary.rtm.BusyLock;
43 import compiler.testlibrary.rtm.CompilableTest;
44 import compiler.testlibrary.rtm.RTMLockingStatistics;
45 import compiler.testlibrary.rtm.RTMTestBase;
46 import jdk.test.lib.Asserts;
47 import jdk.test.lib.process.OutputAnalyzer;
48 import jdk.test.lib.cli.CommandLineOptionTest;
49 import jdk.test.lib.Platform;
50
51 import java.util.List;
52
53 /**
54 * Test verifies that RTMSpinLoopCount increase time spent between retries
55 * by comparing amount of retries done with different RTMSpinLoopCount's values.
56 */
57 public class TestRTMSpinLoopCount {
58 private static final int LOCKING_TIME = 1000;
59 private static final int RTM_RETRY_COUNT = 1000;
60 private static final boolean INFLATE_MONITOR = true;
61 private static final long MAX_ABORTS = RTM_RETRY_COUNT + 1L;
62 private static int[] SPIN_LOOP_COUNTS;
63
64 protected void runTestCases() throws Throwable {
65
66 SPIN_LOOP_COUNTS = new int[] { 0, 100, 1_000, 10_000, 100_000 };
67
68 long[] aborts = new long[TestRTMSpinLoopCount.SPIN_LOOP_COUNTS.length];
69
70 for (int i = 0; i < TestRTMSpinLoopCount.SPIN_LOOP_COUNTS.length; i++) {
71 aborts[i] = getAbortsCountOnLockBusy(
72 TestRTMSpinLoopCount.SPIN_LOOP_COUNTS[i]);
73 }
74
75 for (int i = 1; i < aborts.length; i++) {
76 Asserts.assertLTE(aborts[i], aborts[i - 1], "Increased spin loop "
77 + "count should not increase retries count.");
78 }
79 }
80
81 private long getAbortsCountOnLockBusy(int spinLoopCount) throws Throwable {
82 CompilableTest test = new BusyLock();
83
84 OutputAnalyzer outputAnalyzer = RTMTestBase.executeRTMTest(
85 test,
86 CommandLineOptionTest.prepareNumericFlag("RTMRetryCount",
87 TestRTMSpinLoopCount.RTM_RETRY_COUNT),
88 CommandLineOptionTest.prepareNumericFlag("RTMSpinLoopCount",
89 spinLoopCount),
90 "-XX:-UseRTMXendForLockBusy",
91 "-XX:RTMTotalCountIncrRate=1",
92 "-XX:+PrintPreciseRTMLockingStatistics",
93 BusyLock.class.getName(),
94 Boolean.toString(TestRTMSpinLoopCount.INFLATE_MONITOR),
95 Integer.toString(TestRTMSpinLoopCount.LOCKING_TIME)
96 );
97
98 outputAnalyzer.shouldHaveExitValue(0);
99
100 List<RTMLockingStatistics> statistics = RTMLockingStatistics.fromString(
101 test.getMethodWithLockName(), outputAnalyzer.getOutput());
102
103 Asserts.assertEQ(statistics.size(), 1,
104 "VM output should contain exactly one entry for method "
105 + test.getMethodWithLockName());
106
107 RTMLockingStatistics lock = statistics.get(0);
108
109 Asserts.assertLTE(lock.getTotalAborts(),
110 TestRTMSpinLoopCount.MAX_ABORTS, String.format("Total aborts "
111 + "count (%d) should be less or equal to %d",
112 lock.getTotalAborts(),
113 TestRTMSpinLoopCount.MAX_ABORTS));
114
115 return lock.getTotalAborts();
116 }
117
118 public static void main(String args[]) throws Throwable {
119 new TestRTMSpinLoopCount().runTestCases();
120 }
121 }