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  * @requires vm.gc.G1
31  * @library /test/lib
32  * @modules java.base/jdk.internal.misc
33  *          java.management
34  */
35 
36 import jdk.test.lib.process.OutputAnalyzer;
37 import jdk.test.lib.process.ProcessTools;
38 import java.util.LinkedList;
39 
40 public class TestG1TraceEagerReclaimHumongousObjects {
main(String[] args)41   public static void main(String[] args) throws Exception {
42     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
43                                                "-Xms128M",
44                                                "-Xmx128M",
45                                                "-Xmn16M",
46                                                "-XX:G1HeapRegionSize=1M",
47                                                "-Xlog:gc+phases=trace,gc+humongous=trace",
48                                                "-XX:+UnlockExperimentalVMOptions",
49                                                GCWithHumongousObjectTest.class.getName());
50 
51     OutputAnalyzer output = new OutputAnalyzer(pb.start());
52 
53     // As G1ReclaimDeadHumongousObjectsAtYoungGC is set(default), below logs should be displayed.
54     output.shouldContain("Humongous Reclaim");
55     output.shouldContain("Humongous Total");
56     output.shouldContain("Humongous Candidate");
57     output.shouldContain("Humongous Reclaimed");
58 
59     // As G1TraceReclaimDeadHumongousObjectsAtYoungGC is set and GCWithHumongousObjectTest has humongous objects,
60     // these logs should be displayed.
61     output.shouldContain("Live humongous");
62     output.shouldContain("Dead humongous region");
63     output.shouldHaveExitValue(0);
64   }
65 
66   static class GCWithHumongousObjectTest {
67 
68     public static final int M = 1024*1024;
69     public static LinkedList<Object> garbageList = new LinkedList<Object>();
70     // A large object referenced by a static.
71     static int[] filler = new int[10 * M];
72 
genGarbage()73     public static void genGarbage() {
74       for (int i = 0; i < 32*1024; i++) {
75         garbageList.add(new int[100]);
76       }
77       garbageList.clear();
78     }
79 
main(String[] args)80     public static void main(String[] args) {
81 
82       int[] large = new int[M];
83       Object ref = large;
84 
85       System.out.println("Creating garbage");
86       for (int i = 0; i < 100; i++) {
87         // A large object that will be reclaimed eagerly.
88         large = new int[6*M];
89         genGarbage();
90         // Make sure that the compiler cannot completely remove
91         // the allocation of the large object until here.
92         System.out.println(large);
93       }
94 
95       // Keep the reference to the first object alive.
96       System.out.println(ref);
97       System.out.println("Done");
98     }
99   }
100 }
101