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 * @summary Verify that the flag G1HeapRegionSize is updated properly 29 * @modules java.management/sun.management 30 * @run main/othervm -Xmx64m TestG1HeapRegionSize 1048576 31 * @run main/othervm -XX:G1HeapRegionSize=2m -Xmx64m TestG1HeapRegionSize 2097152 32 * @run main/othervm -XX:G1HeapRegionSize=3m -Xmx64m TestG1HeapRegionSize 2097152 33 * @run main/othervm -XX:G1HeapRegionSize=64m -Xmx256m TestG1HeapRegionSize 33554432 34 */ 35 36 import com.sun.management.HotSpotDiagnosticMXBean; 37 import com.sun.management.VMOption; 38 import java.lang.management.ManagementFactory; 39 40 public class TestG1HeapRegionSize { 41 42 public static void main(String[] args) { 43 HotSpotDiagnosticMXBean diagnostic = 44 ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean.class); 45 46 String expectedValue = getExpectedValue(args); 47 VMOption option = diagnostic.getVMOption("UseG1GC"); 48 if (option.getValue().equals("false")) { 49 System.out.println("Skipping this test. It is only a G1 test."); 50 return; 51 } 52 53 option = diagnostic.getVMOption("G1HeapRegionSize"); 54 if (!expectedValue.equals(option.getValue())) { 55 throw new RuntimeException("Wrong value for G1HeapRegionSize. Expected " + expectedValue + " but got " + option.getValue()); 56 } 57 } 58 59 private static String getExpectedValue(String[] args) { 60 if (args.length != 1) { 61 throw new RuntimeException("Wrong number of arguments. Expected 1 but got " + args.length); 62 } 63 return args[0]; 64 } 65 66 }