1 /*
   2 * Copyright (c) 2013, 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 TestG1HeapRegionSize
  26  * @key gc
  27  * @bug 8021879
  28  * @requires vm.gc=="null" | vm.gc=="G1"
  29  * @summary Verify that the flag G1HeapRegionSize is updated properly
  30  * @modules java.management/sun.management
  31  * @library /testlibrary
  32  * @run main TestG1HeapRegionSize
  33  */
  34 
  35 import java.util.regex.Matcher;
  36 import java.util.regex.Pattern;
  37 
  38 import java.util.ArrayList;
  39 import java.util.Arrays;
  40 
  41 import jdk.test.lib.*;
  42 
  43 public class TestG1HeapRegionSize {
  44 
  45   private static void checkG1HeapRegionSize(String[] flags, int expectedValue, int exitValue) throws Exception {
  46     ArrayList<String> flagList = new ArrayList<String>();
  47     flagList.addAll(Arrays.asList(flags));
  48     flagList.add("-XX:+UseG1GC");
  49     flagList.add("-XX:+PrintFlagsFinal");
  50     flagList.add("-version");
  51 
  52     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flagList.toArray(new String[0]));
  53     OutputAnalyzer output = new OutputAnalyzer(pb.start());
  54     output.shouldHaveExitValue(exitValue);
  55 
  56     if (exitValue == 0) {
  57       String stdout = output.getStdout();
  58       //System.out.println(stdout);
  59       int flagValue = getFlagValue("G1HeapRegionSize", stdout);
  60       if (flagValue != expectedValue) {
  61         throw new RuntimeException("Wrong value for G1HeapRegionSize. Expected " + expectedValue + " but got " + flagValue);
  62       }
  63     }
  64   }
  65 
  66   private static int getFlagValue(String flag, String where) {
  67     Matcher m = Pattern.compile(flag + "\\s+:?=\\s+\\d+").matcher(where);
  68     if (!m.find()) {
  69       throw new RuntimeException("Could not find value for flag " + flag + " in output string");
  70     }
  71     String match = m.group();
  72     return Integer.parseInt(match.substring(match.lastIndexOf(" ") + 1, match.length()));
  73   }
  74 
  75   public static void main(String args[]) throws Exception {
  76     final int M = 1024 * 1024;
  77 
  78     checkG1HeapRegionSize(new String[] { "-Xmx64m"   /* default is 1m */        },  1*M, 0);
  79     checkG1HeapRegionSize(new String[] { "-Xmx64m",  "-XX:G1HeapRegionSize=2m"  },  2*M, 0);
  80     checkG1HeapRegionSize(new String[] { "-Xmx64m",  "-XX:G1HeapRegionSize=3m"  },  2*M, 0);
  81     checkG1HeapRegionSize(new String[] { "-Xmx256m", "-XX:G1HeapRegionSize=32m" }, 32*M, 0);
  82     checkG1HeapRegionSize(new String[] { "-Xmx256m", "-XX:G1HeapRegionSize=64m" }, 32*M, 1);
  83   }
  84 }