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 * @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 TestG1ClassUnloadingHWM 35 * @summary Test that -XX:-ClassUnloadingWithConcurrentMark will trigger a Full GC when more than MetaspaceSize metadata is allocated. 36 */ 37 38 import jdk.test.lib.process.OutputAnalyzer; 39 import jdk.test.lib.process.ProcessTools; 40 import java.util.ArrayList; 41 import java.util.Arrays; 42 import sun.hotspot.WhiteBox; 43 44 public class TestG1ClassUnloadingHWM { 45 private static long MetaspaceSize = 32 * 1024 * 1024; 46 private static long YoungGenSize = 32 * 1024 * 1024; 47 48 private static OutputAnalyzer run(boolean enableUnloading) throws Exception { 49 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( 50 "-Xbootclasspath/a:.", 51 "-XX:+UnlockDiagnosticVMOptions", 52 "-XX:+WhiteBoxAPI", 53 "-XX:MetaspaceSize=" + MetaspaceSize, 54 "-Xmn" + YoungGenSize, 55 "-XX:+UseG1GC", 56 "-XX:" + (enableUnloading ? "+" : "-") + "ClassUnloadingWithConcurrentMark", 57 "-Xlog:gc", 58 TestG1ClassUnloadingHWM.AllocateBeyondMetaspaceSize.class.getName(), 59 "" + MetaspaceSize, 60 "" + YoungGenSize); 61 return new OutputAnalyzer(pb.start()); 62 } 63 64 public static OutputAnalyzer runWithG1ClassUnloading() throws Exception { 65 return run(true); 66 } 67 68 public static OutputAnalyzer runWithoutG1ClassUnloading() throws Exception { 69 return run(false); 70 } 71 72 public static void testWithoutG1ClassUnloading() throws Exception { 73 // -XX:-ClassUnloadingWithConcurrentMark is used, so we expect a full GC instead of a concurrent cycle. 74 OutputAnalyzer out = runWithoutG1ClassUnloading(); 75 76 out.shouldMatch(".*Pause Full.*"); 77 out.shouldNotMatch(".*Pause Initial Mark.*"); 78 } 79 80 public static void testWithG1ClassUnloading() throws Exception { 81 // -XX:+ClassUnloadingWithConcurrentMark is used, so we expect a concurrent cycle instead of a full GC. 82 OutputAnalyzer out = runWithG1ClassUnloading(); 83 84 out.shouldMatch(".*Pause Initial Mark.*"); 85 out.shouldNotMatch(".*Pause Full.*"); 86 } 87 88 public static void main(String args[]) throws Exception { 89 testWithG1ClassUnloading(); 90 testWithoutG1ClassUnloading(); 91 } 92 93 public static class AllocateBeyondMetaspaceSize { 94 public static Object dummy; 95 96 public static void main(String [] args) throws Exception { 97 if (args.length != 2) { 98 throw new IllegalArgumentException("Usage: <MetaspaceSize> <YoungGenSize>"); 99 } 100 101 WhiteBox wb = WhiteBox.getWhiteBox(); 102 103 // Allocate past the MetaspaceSize limit 104 long metaspaceSize = Long.parseLong(args[0]); 105 long allocationBeyondMetaspaceSize = metaspaceSize * 2; 106 long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize); 107 108 long youngGenSize = Long.parseLong(args[1]); 109 triggerYoungGCs(youngGenSize); 110 111 wb.freeMetaspace(null, metaspace, metaspace); 112 } 113 114 public static void triggerYoungGCs(long youngGenSize) { 115 long approxAllocSize = 32 * 1024; 116 long numAllocations = 2 * youngGenSize / approxAllocSize; 117 118 for (long i = 0; i < numAllocations; i++) { 119 dummy = new byte[(int)approxAllocSize]; 120 } 121 } 122 } 123 } 124