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