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.

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    23 

    24 /*

    25  * @test

    26  * @bug 8059100

    27  * @summary Test that you can decrease NMT tracking level but not increase it.

    28  * @key nmt

    29  * @modules java.base/jdk.internal.misc

    30  * @library /test/lib

    31  * @build sun.hotspot.WhiteBox

    32  * @run main ClassFileInstaller sun.hotspot.WhiteBox

    33  *                              sun.hotspot.WhiteBox$WhiteBoxPermission

    34  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail ChangeTrackingLevel

    35  */

    36 

    37 import sun.hotspot.WhiteBox;

    38 

    39 public class ChangeTrackingLevel {

    40 

    41     public static WhiteBox wb = WhiteBox.getWhiteBox();

    42     public static void main(String args[]) throws Exception {

    43         boolean testChangeLevel = wb.NMTChangeTrackingLevel();

    44         if (testChangeLevel) {

    45             System.out.println("NMT level change test passed.");

    46         } else {

    47             // it also fails if the VM asserts.

    48             throw new RuntimeException("NMT level change test failed");

    49         }

    50     }

    51 };