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 /testlibrary /test/lib 29 * @modules java.base/sun.misc 30 * java.management 31 * @build TestG1ClassUnloadingHWM 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.OutputAnalyzer; 39 import jdk.test.lib.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 "-XX:+PrintHeapAtGC", 58 "-XX:+PrintGCDetails", 59 TestG1ClassUnloadingHWM.AllocateBeyondMetaspaceSize.class.getName(), 60 "" + MetaspaceSize, 61 "" + YoungGenSize); 62 return new OutputAnalyzer(pb.start()); 63 } 64 65 public static OutputAnalyzer runWithG1ClassUnloading() throws Exception { 66 return run(true); 67 } 68 69 public static OutputAnalyzer runWithoutG1ClassUnloading() throws Exception { 70 return run(false); 71 } 72 73 public static void testWithoutG1ClassUnloading() throws Exception { 74 // -XX:-ClassUnloadingWithConcurrentMark is used, so we expect a full GC instead of a concurrent cycle. 75 OutputAnalyzer out = runWithoutG1ClassUnloading(); 76 77 out.shouldMatch(".*Full GC.*"); 78 out.shouldNotMatch(".*initial-mark.*"); 79 } 80 81 public static void testWithG1ClassUnloading() throws Exception { 82 // -XX:+ClassUnloadingWithConcurrentMark is used, so we expect a concurrent cycle instead of a full GC. 83 OutputAnalyzer out = runWithG1ClassUnloading(); 84 85 out.shouldMatch(".*initial-mark.*"); 86 out.shouldNotMatch(".*Full GC.*"); 87 } 88 89 public static void main(String args[]) throws Exception { 90 testWithG1ClassUnloading(); 91 testWithoutG1ClassUnloading(); 92 } 93 94 public static class AllocateBeyondMetaspaceSize { 95 public static Object dummy; 96 97 public static void main(String [] args) throws Exception { 98 if (args.length != 2) { 99 throw new IllegalArgumentException("Usage: <MetaspaceSize> <YoungGenSize>"); 100 } 101 102 WhiteBox wb = WhiteBox.getWhiteBox(); 103 104 // Allocate past the MetaspaceSize limit 105 long metaspaceSize = Long.parseLong(args[0]); 106 long allocationBeyondMetaspaceSize = metaspaceSize * 2; 107 long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize); 108 109 long youngGenSize = Long.parseLong(args[1]); 110 triggerYoungGCs(youngGenSize); 111 112 wb.freeMetaspace(null, metaspace, metaspace); 113 } 114 115 public static void triggerYoungGCs(long youngGenSize) { 116 long approxAllocSize = 32 * 1024; 117 long numAllocations = 2 * youngGenSize / approxAllocSize; 118 119 for (long i = 0; i < numAllocations; i++) { 120 dummy = new byte[(int)approxAllocSize]; 121 } 122 } 123 } 124 } 125