1 /* 2 * Copyright (c) 2014, 2020, 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 package gc.class_unloading; 25 26 /* 27 * @test 28 * @bug 8049831 29 * @requires vm.gc.G1 30 * @library /test/lib 31 * @modules java.base/jdk.internal.misc 32 * java.management 33 * @build sun.hotspot.WhiteBox 34 * @run driver ClassFileInstaller sun.hotspot.WhiteBox 35 * @run driver gc.class_unloading.TestG1ClassUnloadingHWM 36 * @summary Test that -XX:-ClassUnloadingWithConcurrentMark will trigger a Full GC when more than MetaspaceSize metadata is allocated. 37 */ 38 39 import jdk.test.lib.process.OutputAnalyzer; 40 import jdk.test.lib.process.ProcessTools; 41 import sun.hotspot.WhiteBox; 42 43 public class TestG1ClassUnloadingHWM { 44 private static long MetaspaceSize = 32 * 1024 * 1024; 45 private static long YoungGenSize = 32 * 1024 * 1024; 46 47 private static OutputAnalyzer run(boolean enableUnloading) throws Exception { 48 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( 49 "-Xbootclasspath/a:.", 50 "-XX:+UnlockDiagnosticVMOptions", 51 "-XX:+WhiteBoxAPI", 52 "-XX:MetaspaceSize=" + MetaspaceSize, 53 "-Xmn" + YoungGenSize, 54 "-XX:+UseG1GC", 55 "-XX:" + (enableUnloading ? "+" : "-") + "ClassUnloadingWithConcurrentMark", 56 "-Xlog:gc", 57 TestG1ClassUnloadingHWM.AllocateBeyondMetaspaceSize.class.getName(), 58 "" + MetaspaceSize, 59 "" + YoungGenSize); 60 return new OutputAnalyzer(pb.start()); 61 } 62 63 public static OutputAnalyzer runWithG1ClassUnloading() throws Exception { 64 return run(true); 65 } 66 67 public static OutputAnalyzer runWithoutG1ClassUnloading() throws Exception { 68 return run(false); 69 } 70 71 public static void testWithoutG1ClassUnloading() throws Exception { 72 // -XX:-ClassUnloadingWithConcurrentMark is used, so we expect a full GC instead of a concurrent cycle. 73 OutputAnalyzer out = runWithoutG1ClassUnloading(); 74 75 out.shouldMatch(".*Pause Full.*"); 76 out.shouldNotMatch(".*Pause Young \\(Concurrent Start\\).*"); 77 } 78 79 public static void testWithG1ClassUnloading() throws Exception { 80 // -XX:+ClassUnloadingWithConcurrentMark is used, so we expect a concurrent cycle instead of a full GC. 81 OutputAnalyzer out = runWithG1ClassUnloading(); 82 83 out.shouldMatch(".*Pause Young \\(Concurrent Start\\).*"); 84 out.shouldNotMatch(".*Pause Full.*"); 85 } 86 87 public static void main(String args[]) throws Exception { 88 testWithG1ClassUnloading(); 89 testWithoutG1ClassUnloading(); 90 } 91 92 public static class AllocateBeyondMetaspaceSize { 93 public static Object dummy; 94 95 public static void main(String [] args) throws Exception { 96 if (args.length != 2) { 97 throw new IllegalArgumentException("Usage: <MetaspaceSize> <YoungGenSize>"); 98 } 99 100 WhiteBox wb = WhiteBox.getWhiteBox(); 101 102 // Allocate past the MetaspaceSize limit 103 long metaspaceSize = Long.parseLong(args[0]); 104 long allocationBeyondMetaspaceSize = metaspaceSize * 2; 105 long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize); 106 107 long youngGenSize = Long.parseLong(args[1]); 108 triggerYoungGCs(youngGenSize); 109 110 wb.freeMetaspace(null, metaspace, metaspace); 111 } 112 113 public static void triggerYoungGCs(long youngGenSize) { 114 long approxAllocSize = 32 * 1024; 115 long numAllocations = 2 * youngGenSize / approxAllocSize; 116 117 for (long i = 0; i < numAllocations; i++) { 118 dummy = new byte[(int)approxAllocSize]; 119 } 120 } 121 } 122 } 123