1 /*

     2  * Copyright (c) 2015, 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 TestPLABOutput

    26  * @bug 8140585

    27  * @summary Check that G1 does not report empty PLAB statistics in the first evacuation.

    28  * @requires vm.gc=="G1" | vm.gc=="null"

    29  * @key gc

    30  * @library /testlibrary /../../test/lib

    31  * @build sun.hotspot.WhiteBox

    32  * @run main ClassFileInstaller sun.hotspot.WhiteBox

    33  * @run driver TestPLABOutput

    34  */

    35 

    36 import sun.hotspot.WhiteBox;

    37 

    38 import java.util.regex.Matcher;

    39 import java.util.regex.Pattern;

    40 

    41 import jdk.test.lib.OutputAnalyzer;

    42 import jdk.test.lib.Platform;

    43 import jdk.test.lib.ProcessTools;

    44 

    45 import static jdk.test.lib.Asserts.*;

    46 

    47 public class TestPLABOutput {

    48 

    49     public static void runTest() throws Exception {

    50         final String[] arguments = {

    51             "-Xbootclasspath/a:.",

    52             "-XX:+UnlockExperimentalVMOptions",

    53             "-XX:+UnlockDiagnosticVMOptions",

    54             "-XX:+WhiteBoxAPI",

    55             "-XX:+UseG1GC",

    56             "-Xmx10M",

    57             "-XX:+PrintGC",

    58             "-XX:+PrintPLAB",

    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 = "#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 

    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 

    89         public static void main(String [] args) {

    90             holder = new byte[100];

    91             WB.youngGC();

    92             System.out.println(holder);

    93         }

    94     }

    95 }

    96