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 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/sun.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 testGCLogs(); 42 testHumongousObjectGCLogs(); 43 } 44 45 private static void testGCLogs() throws Exception { 46 47 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC", 48 "-Xms128M", 49 "-Xmx128M", 50 "-Xmn16M", 51 "-XX:G1HeapRegionSize=1M", 52 "-Xlog:gc+phases=trace", 53 "-XX:+UnlockExperimentalVMOptions", 54 GCTest.class.getName()); 55 56 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 57 58 // As G1EagerReclaimHumongousObjects is set(default), below logs should be displayed. 59 // And GCTest doesn't have humongous objects, so values should be zero. 60 output.shouldContain("Humongous Reclaim"); 61 output.shouldContain("Humongous Total: 0"); 62 output.shouldContain("Humongous Candidate: 0"); 63 output.shouldContain("Humongous Reclaimed: 0"); 64 65 output.shouldHaveExitValue(0); 66 } 67 68 private static void testHumongousObjectGCLogs() throws Exception { 69 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC", 70 "-Xms128M", 71 "-Xmx128M", 72 "-Xmn16M", 73 "-XX:G1HeapRegionSize=1M", 74 "-Xlog:gc+phases=trace,gc+humongous=trace", 75 "-XX:+UnlockExperimentalVMOptions", 76 GCWithHumongousObjectTest.class.getName()); 77 78 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 79 80 // As G1ReclaimDeadHumongousObjectsAtYoungGC is set(default), below logs should be displayed. 81 output.shouldContain("Humongous Reclaim"); 82 output.shouldContain("Humongous Total"); 83 output.shouldContain("Humongous Candidate"); 84 output.shouldContain("Humongous Reclaimed"); 85 86 // As G1TraceReclaimDeadHumongousObjectsAtYoungGC is set and GCWithHumongousObjectTest has humongous objects, 87 // these logs should be displayed. 88 output.shouldContain("Live humongous"); 89 output.shouldContain("Dead humongous region"); 90 output.shouldHaveExitValue(0); 91 } 92 93 static class GCTest { 94 private static byte[] garbage; 95 96 public static void main(String [] args) { 97 System.out.println("Creating garbage"); 98 // create 128MB of garbage. This should result in at least one GC 99 for (int i = 0; i < 1024; i++) { 100 garbage = new byte[128 * 1024]; 101 } 102 System.out.println("Done"); 103 } 104 } 105 106 static class GCWithHumongousObjectTest { 107 108 public static final int M = 1024*1024; 109 public static LinkedList<Object> garbageList = new LinkedList<Object>(); 110 // A large object referenced by a static. 111 static int[] filler = new int[10 * M]; 112 113 public static void genGarbage() { 114 for (int i = 0; i < 32*1024; i++) { 115 garbageList.add(new int[100]); 116 } 117 garbageList.clear(); 118 } 119 120 public static void main(String[] args) { 121 122 int[] large = new int[M]; 123 Object ref = large; 124 125 System.out.println("Creating garbage"); 126 for (int i = 0; i < 100; i++) { 127 // A large object that will be reclaimed eagerly. 128 large = new int[6*M]; 129 genGarbage(); 130 // Make sure that the compiler cannot completely remove 131 // the allocation of the large object until here. 132 System.out.println(large); 133 } 134 135 // Keep the reference to the first object alive. 136 System.out.println(ref); 137 System.out.println("Done"); 138 } 139 } 140 }