1 /* 2 * Copyright (c) 2014, 2016, 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 TestG1TraceEagerReclaimHumongousObjects 26 * @bug 8058801 8048179 27 * @summary Ensure that the output for a G1TraceEagerReclaimHumongousObjects 28 * includes the expected necessary messages. 29 * @key gc 30 * @library /testlibrary 31 * @modules java.base/jdk.internal.misc 32 * java.management 33 */ 34 35 import jdk.test.lib.ProcessTools; 36 import jdk.test.lib.OutputAnalyzer; 37 import java.util.LinkedList; 38 39 public class TestG1TraceEagerReclaimHumongousObjects { 40 public static void main(String[] args) throws Exception { 41 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC", 42 "-Xms128M", 43 "-Xmx128M", 44 "-Xmn16M", 45 "-XX:G1HeapRegionSize=1M", 46 "-Xlog:gc+phases=trace,gc+humongous=trace", 47 "-XX:+UnlockExperimentalVMOptions", 48 GCWithHumongousObjectTest.class.getName()); 49 50 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 51 52 // As G1ReclaimDeadHumongousObjectsAtYoungGC is set(default), below logs should be displayed. 53 output.shouldContain("Humongous Reclaim"); 54 output.shouldContain("Humongous Total"); 55 output.shouldContain("Humongous Candidate"); 56 output.shouldContain("Humongous Reclaimed"); 57 58 // As G1TraceReclaimDeadHumongousObjectsAtYoungGC is set and GCWithHumongousObjectTest has humongous objects, 59 // these logs should be displayed. 60 output.shouldContain("Live humongous"); 61 output.shouldContain("Dead humongous region"); 62 output.shouldHaveExitValue(0); 63 } 64 65 static class GCWithHumongousObjectTest { 66 67 public static final int M = 1024*1024; 68 public static LinkedList<Object> garbageList = new LinkedList<Object>(); 69 // A large object referenced by a static. 70 static int[] filler = new int[10 * M]; 71 72 public static void genGarbage() { 73 for (int i = 0; i < 32*1024; i++) { 74 garbageList.add(new int[100]); 75 } 76 garbageList.clear(); 77 } 78 79 public static void main(String[] args) { 80 81 int[] large = new int[M]; 82 Object ref = large; 83 84 System.out.println("Creating garbage"); 85 for (int i = 0; i < 100; i++) { 86 // A large object that will be reclaimed eagerly. 87 large = new int[6*M]; 88 genGarbage(); 89 // Make sure that the compiler cannot completely remove 90 // the allocation of the large object until here. 91 System.out.println(large); 92 } 93 94 // Keep the reference to the first object alive. 95 System.out.println(ref); 96 System.out.println("Done"); 97 } 98 } 99 }