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 TestG1TraceReclaimDeadHumongousObjectsAtYoungGC 26 * @bug 8058801 27 * @requires vm.gc=="G1" | vm.gc=="null" 28 * @summary Ensure that the output for a G1TraceReclaimDeadHumongousObjectsAtYoungGC 29 * includes the expected necessary messages. 30 * @key gc 31 * @library /testlibrary 32 */ 33 34 import com.oracle.java.testlibrary.ProcessTools; 35 import com.oracle.java.testlibrary.OutputAnalyzer; 36 import java.util.LinkedList; 37 38 public class TestG1TraceReclaimDeadHumongousObjectsAtYoungGC { 39 public static void main(String[] args) throws Exception { 40 testGCLogs(); 41 testHumongousObjectGCLogs(); 42 } 43 44 private static void testGCLogs() throws Exception { 45 46 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC", 47 "-Xms128M", 48 "-Xmx128M", 49 "-Xmn16M", 50 "-XX:G1HeapRegionSize=1M", 51 "-XX:+PrintGC", 52 "-XX:+UnlockExperimentalVMOptions", 53 "-XX:G1LogLevel=finest", 54 "-XX:+G1TraceReclaimDeadHumongousObjectsAtYoungGC", 55 GCTest.class.getName()); 56 57 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 58 59 // As G1ReclaimDeadHumongousObjectsAtYoungGC is set(default), below logs should be displayed. 60 // And GCTest doesn't have humongous objects, so values should be zero. 61 output.shouldContain("[Humongous Reclaim"); 62 output.shouldContain("[Humongous Total: 0]"); 63 output.shouldContain("[Humongous Candidate: 0]"); 64 output.shouldContain("[Humongous Reclaimed: 0]"); 65 66 output.shouldHaveExitValue(0); 67 } 68 69 private static void testHumongousObjectGCLogs() throws Exception { 70 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC", 71 "-Xms128M", 72 "-Xmx128M", 73 "-Xmn16M", 74 "-XX:G1HeapRegionSize=1M", 75 "-XX:+PrintGC", 76 "-XX:+UnlockExperimentalVMOptions", 77 "-XX:G1LogLevel=finest", 78 "-XX:+G1TraceReclaimDeadHumongousObjectsAtYoungGC", 79 GCWithHumongousObjectTest.class.getName()); 80 81 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 82 83 // As G1ReclaimDeadHumongousObjectsAtYoungGC is set(default), below logs should be displayed. 84 output.shouldContain("[Humongous Reclaim"); 85 output.shouldContain("[Humongous Total"); 86 output.shouldContain("[Humongous Candidate"); 87 output.shouldContain("[Humongous Reclaimed"); 88 89 // As G1TraceReclaimDeadHumongousObjectsAtYoungGC is set and GCWithHumongousObjectTest has humongous objects, 90 // these logs should be displayed. 91 output.shouldContain("Live humongous"); 92 output.shouldContain("Reclaim humongous region"); 93 output.shouldHaveExitValue(0); 94 } 95 96 static class GCTest { 97 private static byte[] garbage; 98 99 public static void main(String [] args) { 100 System.out.println("Creating garbage"); 101 // create 128MB of garbage. This should result in at least one GC 102 for (int i = 0; i < 1024; i++) { 103 garbage = new byte[128 * 1024]; 104 } 105 System.out.println("Done"); 106 } 107 } 108 109 static class GCWithHumongousObjectTest { 110 111 public static final int M = 1024*1024; 112 public static LinkedList<Object> garbageList = new LinkedList<Object>(); 113 // A large object referenced by a static. 114 static int[] filler = new int[10 * M]; 115 116 public static void genGarbage() { 117 for (int i = 0; i < 32*1024; i++) { 118 garbageList.add(new int[100]); 119 } 120 garbageList.clear(); 121 } 122 123 public static void main(String[] args) { 124 125 int[] large = new int[M]; 126 Object ref = large; 127 128 System.out.println("Creating garbage"); 129 for (int i = 0; i < 100; i++) { 130 // A large object that will be reclaimed eagerly. 131 large = new int[6*M]; 132 genGarbage(); 133 // Make sure that the compiler cannot completely remove 134 // the allocation of the large object until here. 135 System.out.println(large); 136 } 137 138 // Keep the reference to the first object alive. 139 System.out.println(ref); 140 System.out.println("Done"); 141 } 142 } 143 }