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 
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