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/*

 * @test

 * @bug 8059100

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

 * @key nmt

 * @library /testlibrary /test/lib

 * @build ChangeTrackingLevel

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

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

 */

import jdk.test.lib.*;

import sun.hotspot.WhiteBox;

public class ChangeTrackingLevel {

    public static WhiteBox wb = WhiteBox.getWhiteBox();

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

        boolean testChangeLevel = wb.NMTChangeTrackingLevel();

        if (testChangeLevel) {

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

        } else {

            // it also fails if the VM asserts.

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

        }

    }

};