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 * @test 26 * @key gc 27 * @bug 8049831 28 * @library /testlibrary /testlibrary/whitebox 29 * @build TestCMSClassUnloadingEnabledHWM 30 * @requires vm.gc=="ConcMarkSweep" | vm.gc=="null" 31 * @run main ClassFileInstaller sun.hotspot.WhiteBox 32 * sun.hotspot.WhiteBox$WhiteBoxPermission 33 * @run driver TestCMSClassUnloadingEnabledHWM 34 * @summary Test that -XX:-CMSClassUnloadingEnabled will trigger a Full GC when more than MetaspaceSize metadata is allocated. 35 */ 36 37 import com.oracle.java.testlibrary.OutputAnalyzer; 38 import com.oracle.java.testlibrary.ProcessTools; 39 import java.lang.management.GarbageCollectorMXBean; 40 import java.lang.management.ManagementFactory; 41 import java.util.ArrayList; 42 import java.util.Arrays; 43 import sun.hotspot.WhiteBox; 44 45 public class TestCMSClassUnloadingEnabledHWM { 46 private static long MetaspaceSize = 32 * 1024 * 1024; 47 private static long YoungGenSize = 32 * 1024 * 1024; 48 49 private static OutputAnalyzer run(boolean enableUnloading) throws Exception { 50 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( 51 "-Xbootclasspath/a:.", 52 "-XX:+UnlockDiagnosticVMOptions", 53 "-XX:+WhiteBoxAPI", 54 "-Xmx128m", 55 "-XX:CMSMaxAbortablePrecleanTime=1", 56 "-XX:CMSWaitDuration=50", 57 "-XX:MetaspaceSize=" + MetaspaceSize, 58 "-Xmn" + YoungGenSize, 59 "-XX:+UseConcMarkSweepGC", 60 "-XX:" + (enableUnloading ? "+" : "-") + "CMSClassUnloadingEnabled", 61 "-XX:+PrintHeapAtGC", 62 "-XX:+PrintGCDetails", 63 "-XX:+PrintGCTimeStamps", 64 TestCMSClassUnloadingEnabledHWM.AllocateBeyondMetaspaceSize.class.getName(), 65 "" + MetaspaceSize); 66 return new OutputAnalyzer(pb.start()); 67 } 68 69 public static OutputAnalyzer runWithCMSClassUnloading() throws Exception { 70 return run(true); 71 } 72 73 public static OutputAnalyzer runWithoutCMSClassUnloading() throws Exception { 74 return run(false); 75 } 76 77 public static void testWithoutCMSClassUnloading() throws Exception { 78 // -XX:-CMSClassUnloadingEnabled is used, so we expect a full GC instead of a concurrent cycle. 79 OutputAnalyzer out = runWithoutCMSClassUnloading(); 80 81 out.shouldMatch(".*Full GC.*"); 82 out.shouldNotMatch(".*CMS Initial Mark.*"); 83 } 84 85 public static void testWithCMSClassUnloading() throws Exception { 86 // -XX:+CMSClassUnloadingEnabled is used, so we expect a concurrent cycle instead of a full GC. 87 OutputAnalyzer out = runWithCMSClassUnloading(); 88 89 out.shouldMatch(".*CMS Initial Mark.*"); 90 out.shouldNotMatch(".*Full GC.*"); 91 } 92 93 public static void main(String args[]) throws Exception { 94 testWithCMSClassUnloading(); 95 testWithoutCMSClassUnloading(); 96 } 97 98 public static class AllocateBeyondMetaspaceSize { 99 public static void main(String [] args) throws Exception { 100 if (args.length != 1) { 101 throw new IllegalArgumentException("Usage: <MetaspaceSize>"); 102 } 103 104 WhiteBox wb = WhiteBox.getWhiteBox(); 105 106 // Allocate past the MetaspaceSize limit. 107 long metaspaceSize = Long.parseLong(args[0]); 108 long allocationBeyondMetaspaceSize = metaspaceSize * 2; 109 long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize); 110 111 // Wait for at least one GC to occur. The caller will parse the log files produced. 112 GarbageCollectorMXBean cmsGCBean = getCMSGCBean(); 113 while (cmsGCBean.getCollectionCount() == 0) { 114 Thread.sleep(100); 115 } 116 117 wb.freeMetaspace(null, metaspace, metaspace); 118 } 119 120 private static GarbageCollectorMXBean getCMSGCBean() { 121 for (GarbageCollectorMXBean gcBean : ManagementFactory.getGarbageCollectorMXBeans()) { 122 if (gcBean.getObjectName().toString().equals("java.lang:type=GarbageCollector,name=ConcurrentMarkSweep")) { 123 return gcBean; 124 } 125 } 126 return null; 127 } 128 } 129 } 130