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 RTMLockingThreshold affects rtm state transition 29 * ProfileRTM => UseRTM. 30 * @library /testlibrary /../../test/lib /compiler/testlibrary 31 * @modules java.base/sun.misc 32 * java.management 33 * @build TestRTMLockingThreshold 34 * @run main ClassFileInstaller sun.hotspot.WhiteBox 35 * sun.hotspot.WhiteBox$WhiteBoxPermission 36 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions 37 * -XX:+WhiteBoxAPI TestRTMLockingThreshold 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 import sun.misc.Unsafe; 48 49 /** 50 * Test verifies that RTMLockingThreshold option actually affects how soon 51 * method will be deoptimized on low abort ratio. 52 */ 53 public class TestRTMLockingThreshold extends CommandLineOptionTest { 54 private TestRTMLockingThreshold() { 55 super(new AndPredicate(new SupportedVM(), new SupportedCPU())); 56 } 57 58 /** 59 * We use non-zero abort threshold to avoid abort related to 60 * interrupts, VMM calls, etc. during first lock attempt. 61 * 62 */ 63 private static final int MIN_ABORT_THRESHOLD = 10; 64 65 @Override 66 protected void runTestCases() throws Throwable { 67 verifyLockingThreshold(0, false); 68 verifyLockingThreshold(100, false); 69 verifyLockingThreshold(1000, false); 70 71 verifyLockingThreshold(0, true); 72 verifyLockingThreshold(100, true); 73 verifyLockingThreshold(1000, true); 74 } 75 76 private void verifyLockingThreshold(int lockingThreshold, 77 boolean useStackLock) throws Throwable { 78 CompilableTest test = new Test(); 79 80 int abortThreshold = Math.max(lockingThreshold / 2, 81 TestRTMLockingThreshold.MIN_ABORT_THRESHOLD); 82 83 OutputAnalyzer outputAnalyzer = RTMTestBase.executeRTMTest( 84 test, 85 "-XX:CompileThreshold=1", 86 CommandLineOptionTest.prepareBooleanFlag("UseRTMForStackLocks", 87 useStackLock), 88 "-XX:+UseRTMDeopt", 89 "-XX:RTMTotalCountIncrRate=1", 90 "-XX:RTMRetryCount=0", 91 CommandLineOptionTest.prepareNumericFlag("RTMAbortThreshold", 92 abortThreshold), 93 CommandLineOptionTest.prepareNumericFlag("RTMLockingThreshold", 94 lockingThreshold), 95 "-XX:RTMAbortRatio=100", 96 "-XX:+PrintPreciseRTMLockingStatistics", 97 Test.class.getName(), 98 Boolean.toString(!useStackLock), 99 Integer.toString(lockingThreshold) 100 ); 101 102 outputAnalyzer.shouldHaveExitValue(0); 103 104 List<RTMLockingStatistics> statistics = RTMLockingStatistics.fromString( 105 test.getMethodWithLockName(), outputAnalyzer.getOutput()); 106 107 Asserts.assertEQ(statistics.size(), 2, "VM output should contain two " 108 + "RTM locking statistics entries."); 109 110 /** 111 * If RTMLockingThreshold==0, then we have to make at least 1 call. 112 */ 113 long expectedValue = lockingThreshold; 114 if (expectedValue == 0) { 115 expectedValue++; 116 } 117 118 RTMLockingStatistics statBeforeDeopt = null; 119 for (RTMLockingStatistics s : statistics) { 120 if (s.getTotalLocks() == expectedValue) { 121 Asserts.assertNull(statBeforeDeopt, 122 "Only one statistics entry should contain aborts"); 123 statBeforeDeopt = s; 124 } 125 } 126 127 Asserts.assertNotNull(statBeforeDeopt, "There should be exactly one " 128 + "statistics entry corresponding to ProfileRTM state."); 129 } 130 131 public static class Test implements CompilableTest { 132 // Following field have to be static in order to avoid escape analysis. 133 @SuppressWarnings("UnsuedDeclaration") 134 private static int field = 0; 135 private static final int TOTAL_ITERATIONS = 10000; 136 private static final Unsafe UNSAFE = Utils.getUnsafe(); 137 private final Object monitor = new Object(); 138 139 140 @Override 141 public String getMethodWithLockName() { 142 return this.getClass().getName() + "::lock"; 143 } 144 145 @Override 146 public String[] getMethodsToCompileNames() { 147 return new String[] { getMethodWithLockName() }; 148 } 149 150 public void lock(boolean abort) { 151 synchronized(monitor) { 152 if (abort) { 153 Test.field += Test.UNSAFE.addressSize(); 154 } 155 } 156 } 157 158 /** 159 * Usage: 160 * Test <inflate monitor> 161 */ 162 public static void main(String args[]) throws Throwable { 163 Asserts.assertGTE(args.length, 2, "Two arguments required."); 164 Test t = new Test(); 165 boolean shouldBeInflated = Boolean.valueOf(args[0]); 166 int lockingThreshold = Integer.valueOf(args[1]); 167 if (shouldBeInflated) { 168 AbortProvoker.inflateMonitor(t.monitor); 169 } 170 for (int i = 0; i < Test.TOTAL_ITERATIONS; i++) { 171 AbortProvoker.verifyMonitorState(t.monitor, shouldBeInflated); 172 t.lock(i >= lockingThreshold / 2); 173 } 174 } 175 } 176 177 public static void main(String args[]) throws Throwable { 178 new TestRTMLockingThreshold().test(); 179 } 180 }