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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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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 8059100
 * @summary Test that you can decrease NMT tracking level but not increase it.
 * @key nmt
 * @modules java.base/jdk.internal.misc
 * @library /test/lib
 * @build sun.hotspot.WhiteBox
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 *                              sun.hotspot.WhiteBox$WhiteBoxPermission
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail ChangeTrackingLevel
 */

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");
        }
    }
};