1 /* 2 * Copyright (c) 2013, 2016, 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.G1 29 * @summary Verify that the flag G1HeapRegionSize is updated properly 30 * @modules java.base/jdk.internal.misc 31 * @modules java.management/sun.management 32 * @library /test/lib 33 * @run main TestG1HeapRegionSize 34 */ 35 36 import java.util.regex.Matcher; 37 import java.util.regex.Pattern; 38 39 import java.util.ArrayList; 40 import java.util.Arrays; 41 42 import jdk.test.lib.process.OutputAnalyzer; 43 import jdk.test.lib.process.ProcessTools; 44 45 public class TestG1HeapRegionSize { 46 47 private static void checkG1HeapRegionSize(String[] flags, int expectedValue, int exitValue) throws Exception { 48 ArrayList<String> flagList = new ArrayList<String>(); 49 flagList.addAll(Arrays.asList(flags)); 50 flagList.add("-XX:+UseG1GC"); 51 flagList.add("-XX:+PrintFlagsFinal"); 52 flagList.add("-version"); 53 54 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flagList.toArray(new String[0])); 55 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 56 output.shouldHaveExitValue(exitValue); 57 58 if (exitValue == 0) { 59 String stdout = output.getStdout(); 60 int flagValue = getFlagValue("G1HeapRegionSize", stdout); 61 if (flagValue != expectedValue) { 62 throw new RuntimeException("Wrong value for G1HeapRegionSize. Expected " + expectedValue + " but got " + flagValue); 63 } 64 } 65 } 66 67 private static int getFlagValue(String flag, String where) { 68 Matcher m = Pattern.compile(flag + "\\s+:?=\\s+\\d+").matcher(where); 69 if (!m.find()) { 70 throw new RuntimeException("Could not find value for flag " + flag + " in output string"); 71 } 72 String match = m.group(); 73 return Integer.parseInt(match.substring(match.lastIndexOf(" ") + 1, match.length())); 74 } 75 76 public static void main(String args[]) throws Exception { 77 final int M = 1024 * 1024; 78 79 checkG1HeapRegionSize(new String[] { "-Xmx64m" /* default is 1m */ }, 1*M, 0); 80 checkG1HeapRegionSize(new String[] { "-Xmx64m", "-XX:G1HeapRegionSize=2m" }, 2*M, 0); 81 checkG1HeapRegionSize(new String[] { "-Xmx64m", "-XX:G1HeapRegionSize=3m" }, 2*M, 0); 82 checkG1HeapRegionSize(new String[] { "-Xmx256m", "-XX:G1HeapRegionSize=32m" }, 32*M, 0); 83 checkG1HeapRegionSize(new String[] { "-Xmx256m", "-XX:G1HeapRegionSize=64m" }, 32*M, 1); 84 } 85 }