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 TestCMSClassUnloadingDisabledHWM 30 * @run main ClassFileInstaller sun.hotspot.WhiteBox 31 * @run driver TestCMSClassUnloadingDisabledHWM 32 * @summary Test that -XX:-CMSClassUnloadingEnabled will trigger a Full GC when more than MetaspaceSize metadata is allocated. 33 */ 34 35 import com.oracle.java.testlibrary.OutputAnalyzer; 36 import com.oracle.java.testlibrary.ProcessTools; 37 import sun.hotspot.WhiteBox; 38 39 import java.util.ArrayList; 40 import java.util.Arrays; 41 42 public class TestCMSClassUnloadingDisabledHWM { 43 44 private static OutputAnalyzer run(long metaspaceSize, long youngGenSize) throws Exception { 45 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( 46 "-Xbootclasspath/a:.", 47 "-XX:+WhiteBoxAPI", 48 "-XX:MetaspaceSize=" + metaspaceSize, 49 "-Xmn" + youngGenSize, 50 "-XX:+UseConcMarkSweepGC", 51 "-XX:-CMSClassUnloadingEnabled", 52 "-XX:+PrintHeapAtGC", 53 "-XX:+PrintGCDetails", 54 "AllocateBeyondMetaspaceSize", 55 "" + metaspaceSize, 56 "" + youngGenSize); 57 return new OutputAnalyzer(pb.start()); 58 } 59 60 public static void main(String args[]) throws Exception { 61 long metaspaceSize = 32 * 1024 * 1024; 62 long youngGenSize = 32 * 1024 * 1024; 63 64 OutputAnalyzer out = run(metaspaceSize, youngGenSize); 65 66 // -XX:-CMSClassUnloadingEnabled is used, so we expect a full GC instead of a concurrent cycle. 67 out.shouldMatch(".*Full GC.*"); 68 out.shouldNotMatch(".*CMS Initial Mark.*"); 69 } 70 } 71 72 class AllocateBeyondMetaspaceSize { 73 public static Object dummy; 74 75 public static void main(String [] args) { 76 if (args.length != 2) { 77 throw new IllegalArgumentException("Usage: <MetaspaceSize> <YoungGenSize>"); 78 } 79 80 long metaspaceSize = Long.parseLong(args[0]); 81 long youngGenSize = Long.parseLong(args[1]); 82 83 run(metaspaceSize, youngGenSize); 84 } 85 86 private static void run(long metaspaceSize, long youngGenSize) { 87 WhiteBox wb = WhiteBox.getWhiteBox(); 88 89 long allocationBeyondMetaspaceSize = metaspaceSize * 2; 90 long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize); 91 92 triggerYoungGC(youngGenSize); 93 94 wb.freeMetaspace(null, metaspace, metaspace); 95 } 96 97 private static void triggerYoungGC(long youngGenSize) { 98 long approxAllocSize = 32 * 1024; 99 long numAllocations = 2 * youngGenSize / approxAllocSize; 100 101 for (long i = 0; i < numAllocations; i++) { 102 dummy = new byte[(int)approxAllocSize]; 103 } 104 } 105 }