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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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* version 2 for more details (a copy is included in the LICENSE file that

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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

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/*

 * @test TestG1HeapRegionSize

 * @key gc

 * @bug 8021879

 * @summary Verify that the flag G1HeapRegionSize is updated properly

 * @run main/othervm -Xmx64m TestG1HeapRegionSize 1048576

 * @run main/othervm -XX:G1HeapRegionSize=2m -Xmx64m TestG1HeapRegionSize 2097152

 * @run main/othervm -XX:G1HeapRegionSize=3m -Xmx64m TestG1HeapRegionSize 2097152

 * @run main/othervm -XX:G1HeapRegionSize=64m -Xmx256m TestG1HeapRegionSize 33554432

 */

import sun.management.ManagementFactoryHelper;

import com.sun.management.HotSpotDiagnosticMXBean;

import com.sun.management.VMOption;

public class TestG1HeapRegionSize {

  public static void main(String[] args) {

    HotSpotDiagnosticMXBean diagnostic = ManagementFactoryHelper.getDiagnosticMXBean();

    VMOption option = diagnostic.getVMOption("UseG1GC");

    if (option.getValue().equals("false")) {

      System.out.println("Skipping this test. It is only a G1 test.");

      return;

    }

    String expectedValue = getExpectedValue(args);

    option = diagnostic.getVMOption("G1HeapRegionSize");

    if (!expectedValue.equals(option.getValue())) {

      throw new RuntimeException("Wrong value for G1HeapRegionSize. Expected " + expectedValue + " but got " + option.getValue());

    }

  }

  private static String getExpectedValue(String[] args) {

    if (args.length != 1) {

      throw new RuntimeException("Wrong number of arguments. Expected 1 but got " + args.length);

    }

    return args[0];

  }

}