1 /*
2  * Copyright (c) 2015, 2020, 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 package gc.g1;
25 
26 /*
27  * @test TestPLABOutput
28  * @bug 8140585
29  * @summary Check that G1 does not report empty PLAB statistics in the first evacuation.
30  * @requires vm.gc.G1
31  * @modules java.base/jdk.internal.misc
32  * @library /test/lib
33  * @build sun.hotspot.WhiteBox
34  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
35  * @run driver gc.g1.TestPLABOutput
36  */
37 
38 import sun.hotspot.WhiteBox;
39 
40 import java.util.regex.Matcher;
41 import java.util.regex.Pattern;
42 
43 import jdk.test.lib.process.OutputAnalyzer;
44 import jdk.test.lib.process.ProcessTools;
45 
46 import static jdk.test.lib.Asserts.*;
47 
48 public class TestPLABOutput {
49 
runTest()50     public static void runTest() throws Exception {
51         final String[] arguments = {
52             "-Xbootclasspath/a:.",
53             "-XX:+UnlockExperimentalVMOptions",
54             "-XX:+UnlockDiagnosticVMOptions",
55             "-XX:+WhiteBoxAPI",
56             "-XX:+UseG1GC",
57             "-Xmx10M",
58             "-Xlog:gc+plab=debug",
59             GCTest.class.getName()
60             };
61 
62         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(arguments);
63         OutputAnalyzer output = new OutputAnalyzer(pb.start());
64 
65         output.shouldHaveExitValue(0);
66 
67         System.out.println(output.getStdout());
68 
69         String pattern = ".*GC\\(0\\) .*allocated: (\\d+).*";
70         Pattern r = Pattern.compile(pattern);
71         Matcher m = r.matcher(output.getStdout());
72 
73         if (!m.find()) {
74             throw new RuntimeException("Could not find any PLAB statistics output");
75         }
76         int allocated = Integer.parseInt(m.group(1));
77         assertGT(allocated, 0, "Did not allocate any memory during test");
78     }
79 
main(String[] args)80     public static void main(String[] args) throws Exception {
81         runTest();
82     }
83 
84     static class GCTest {
85         private static final WhiteBox WB = WhiteBox.getWhiteBox();
86 
87         public static Object holder;
88 
main(String [] args)89         public static void main(String [] args) {
90             holder = new byte[100];
91             WB.youngGC();
92             System.out.println(holder);
93         }
94     }
95 }
96 
97