1/* 2 * Copyright (c) 2014, 2016, 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 * @key gc 27 * @bug 8049831 28 * @library /test/lib 29 * @modules java.base/jdk.internal.misc 30 * java.management 31 * @build sun.hotspot.WhiteBox 32 * @run main ClassFileInstaller sun.hotspot.WhiteBox 33 * sun.hotspot.WhiteBox$WhiteBoxPermission 34 * @run driver TestCMSClassUnloadingEnabledHWM 35 * @summary Test that -XX:-CMSClassUnloadingEnabled will trigger a Full GC when more than MetaspaceSize metadata is allocated. 36 */ 37 38import jdk.test.lib.process.OutputAnalyzer; 39import jdk.test.lib.process.ProcessTools; 40import java.lang.management.GarbageCollectorMXBean; 41import java.lang.management.ManagementFactory; 42import java.util.ArrayList; 43import java.util.Arrays; 44import sun.hotspot.WhiteBox; 45 46public class TestCMSClassUnloadingEnabledHWM { 47 private static long MetaspaceSize = 32 * 1024 * 1024; 48 private static long YoungGenSize = 32 * 1024 * 1024; 49 50 private static OutputAnalyzer run(boolean enableUnloading) throws Exception { 51 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( 52 "-Xbootclasspath/a:.", 53 "-XX:+UnlockDiagnosticVMOptions", 54 "-XX:+WhiteBoxAPI", 55 "-Xmx128m", 56 "-XX:CMSMaxAbortablePrecleanTime=1", 57 "-XX:CMSWaitDuration=50", 58 "-XX:MetaspaceSize=" + MetaspaceSize, 59 "-Xmn" + YoungGenSize, 60 "-XX:+UseConcMarkSweepGC", 61 "-XX:" + (enableUnloading ? "+" : "-") + "CMSClassUnloadingEnabled", 62 "-Xlog:gc", 63 TestCMSClassUnloadingEnabledHWM.AllocateBeyondMetaspaceSize.class.getName(), 64 "" + MetaspaceSize); 65 return new OutputAnalyzer(pb.start()); 66 } 67 68 public static OutputAnalyzer runWithCMSClassUnloading() throws Exception { 69 return run(true); 70 } 71 72 public static OutputAnalyzer runWithoutCMSClassUnloading() throws Exception { 73 return run(false); 74 } 75 76 public static void testWithoutCMSClassUnloading() throws Exception { 77 // -XX:-CMSClassUnloadingEnabled is used, so we expect a full GC instead of a concurrent cycle. 78 OutputAnalyzer out = runWithoutCMSClassUnloading(); 79 80 out.shouldMatch(".*Pause Full.*"); 81 out.shouldNotMatch(".*Pause Initial Mark.*"); 82 } 83 84 public static void testWithCMSClassUnloading() throws Exception { 85 // -XX:+CMSClassUnloadingEnabled is used, so we expect a concurrent cycle instead of a full GC. 86 OutputAnalyzer out = runWithCMSClassUnloading(); 87 88 out.shouldMatch(".*Pause Initial Mark.*"); 89 out.shouldNotMatch(".*Pause Full.*"); 90 } 91 92 public static void main(String args[]) throws Exception { 93 testWithCMSClassUnloading(); 94 testWithoutCMSClassUnloading(); 95 } 96 97 public static class AllocateBeyondMetaspaceSize { 98 public static void main(String [] args) throws Exception { 99 if (args.length != 1) { 100 throw new IllegalArgumentException("Usage: <MetaspaceSize>"); 101 } 102 103 WhiteBox wb = WhiteBox.getWhiteBox(); 104 105 // Allocate past the MetaspaceSize limit. 106 long metaspaceSize = Long.parseLong(args[0]); 107 long allocationBeyondMetaspaceSize = metaspaceSize * 2; 108 long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize); 109 110 // Wait for at least one GC to occur. The caller will parse the log files produced. 111 GarbageCollectorMXBean cmsGCBean = getCMSGCBean(); 112 while (cmsGCBean.getCollectionCount() == 0) { 113 Thread.sleep(100); 114 } 115 116 wb.freeMetaspace(null, metaspace, metaspace); 117 } 118 119 private static GarbageCollectorMXBean getCMSGCBean() { 120 for (GarbageCollectorMXBean gcBean : ManagementFactory.getGarbageCollectorMXBeans()) { 121 if (gcBean.getObjectName().toString().equals("java.lang:type=GarbageCollector,name=ConcurrentMarkSweep")) { 122 return gcBean; 123 } 124 } 125 return null; 126 } 127 } 128} 129 130