1 /* 2 * Copyright (c) 2013, 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 * @summary Verify that the flag G1HeapRegionSize is updated properly 29 * @run main/othervm -XX:+UseG1GC -Xmx64m TestG1HeapRegionSize 1048576 30 * @run main/othervm -XX:+UseG1GC -XX:G1HeapRegionSize=2m -Xmx64m TestG1HeapRegionSize 2097152 31 * @run main/othervm -XX:+UseG1GC -XX:G1HeapRegionSize=3m -Xmx64m TestG1HeapRegionSize 2097152 32 */ 33 34 import sun.management.ManagementFactoryHelper; 35 import com.sun.management.HotSpotDiagnosticMXBean; 36 import com.sun.management.VMOption; 37 38 public class TestG1HeapRegionSize { 39 40 public static void main(String[] args) { 41 String expectedValue = getExpectedValue(args); 42 HotSpotDiagnosticMXBean diagnostic = ManagementFactoryHelper.getDiagnosticMXBean(); 43 VMOption option = diagnostic.getVMOption("G1HeapRegionSize"); 44 if (!expectedValue.equals(option.getValue())) { 45 throw new RuntimeException("Wrong value for G1HeapRegionSize. Expected " + expectedValue + " but got " + option.getValue()); 46 } 47 } 48 49 private static String getExpectedValue(String[] args) { 50 if (args.length != 1) { 51 throw new RuntimeException("Wrong number of arguments. Expected 1 but got " + args.length); 52 } 53 return args[0]; 54 } 55 56 }