test/runtime/memory/ReadVMPageSize.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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/*
 * @test
 * @summary Using WhiteBox to get VM page size
 * @library /testlibrary /testlibrary/whitebox
 * @build ReadVMPageSize
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 * @run main/othervm  -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI  ReadVMPageSize
 */

import com.oracle.java.testlibrary.*;
import sun.hotspot.WhiteBox;

public class ReadVMPageSize {
  public static void main(String args[]) throws Exception {
    WhiteBox wb = WhiteBox.getWhiteBox();
    int pageSize = wb.getVMPageSize();
    if (pageSize < 0) {
      throw new Exception("pageSize < 0");
    } else {
      System.out.println("Page size = " + pageSize);
    }
  }
}