1 /* 2 * Copyright (c) 2014, 2015, 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 /** 26 * @test 27 * @bug 8031320 28 * @summary Verify that RTMSpinLoopCount affects time spent 29 * between locking attempts. 30 * @library /testlibrary /../../test/lib /compiler/testlibrary 31 * @modules java.base/sun.misc 32 * java.management 33 * @build TestRTMSpinLoopCount 34 * @run main ClassFileInstaller sun.hotspot.WhiteBox 35 * sun.hotspot.WhiteBox$WhiteBoxPermission 36 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions 37 * -XX:+WhiteBoxAPI TestRTMSpinLoopCount 38 */ 39 40 import java.util.List; 41 import jdk.test.lib.*; 42 import jdk.test.lib.cli.CommandLineOptionTest; 43 import jdk.test.lib.cli.predicate.AndPredicate; 44 import rtm.*; 45 import rtm.predicate.SupportedCPU; 46 import rtm.predicate.SupportedVM; 47 48 /** 49 * Test verifies that RTMSpinLoopCount increase time spent between retries 50 * by comparing amount of retries done with different RTMSpinLoopCount's values. 51 */ 52 public class TestRTMSpinLoopCount extends CommandLineOptionTest { 53 private static final int LOCKING_TIME = 1000; 54 private static final int RTM_RETRY_COUNT = 1000; 55 private static final boolean INFLATE_MONITOR = true; 56 private static final long MAX_ABORTS = RTM_RETRY_COUNT + 1L; 57 private static final int[] SPIN_LOOP_COUNTS 58 = new int[] { 0, 100, 1_000, 1_000_000, 10_000_000 }; 59 60 private TestRTMSpinLoopCount() { 61 super(new AndPredicate(new SupportedVM(), new SupportedCPU())); 62 } 63 64 @Override 65 protected void runTestCases() throws Throwable { 66 long[] aborts = new long[TestRTMSpinLoopCount.SPIN_LOOP_COUNTS.length]; 67 for (int i = 0; i < TestRTMSpinLoopCount.SPIN_LOOP_COUNTS.length; i++) { 68 aborts[i] = getAbortsCountOnLockBusy( 69 TestRTMSpinLoopCount.SPIN_LOOP_COUNTS[i]); 70 } 71 72 for (int i = 1; i < aborts.length; i++) { 73 Asserts.assertLTE(aborts[i], aborts[i - 1], "Increased spin loop " 74 + "count should not increase retries count."); 75 } 76 } 77 78 private long getAbortsCountOnLockBusy(int spinLoopCount) throws Throwable { 79 CompilableTest test = new BusyLock(); 80 81 OutputAnalyzer outputAnalyzer = RTMTestBase.executeRTMTest( 82 test, 83 CommandLineOptionTest.prepareNumericFlag("RTMRetryCount", 84 TestRTMSpinLoopCount.RTM_RETRY_COUNT), 85 CommandLineOptionTest.prepareNumericFlag("RTMSpinLoopCount", 86 spinLoopCount), 87 "-XX:-UseRTMXendForLockBusy", 88 "-XX:RTMTotalCountIncrRate=1", 89 "-XX:+PrintPreciseRTMLockingStatistics", 90 BusyLock.class.getName(), 91 Boolean.toString(TestRTMSpinLoopCount.INFLATE_MONITOR), 92 Integer.toString(TestRTMSpinLoopCount.LOCKING_TIME) 93 ); 94 95 outputAnalyzer.shouldHaveExitValue(0); 96 97 List<RTMLockingStatistics> statistics = RTMLockingStatistics.fromString( 98 test.getMethodWithLockName(), outputAnalyzer.getOutput()); 99 100 Asserts.assertEQ(statistics.size(), 1, 101 "VM output should contain exactly one entry for method " 102 + test.getMethodWithLockName()); 103 104 RTMLockingStatistics lock = statistics.get(0); 105 106 Asserts.assertLTE(lock.getTotalAborts(), 107 TestRTMSpinLoopCount.MAX_ABORTS, String.format("Total aborts " 108 + "count (%d) should be less or equal to %d", 109 lock.getTotalAborts(), 110 TestRTMSpinLoopCount.MAX_ABORTS)); 111 112 return lock.getTotalAborts(); 113 } 114 115 public static void main(String args[]) throws Throwable { 116 new TestRTMSpinLoopCount().test(); 117 } 118 }