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