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.
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5 * This code is free software; you can redistribute it and/or modify it
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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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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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 }