/*

 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

 * 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

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 *

 * 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 Test corner case that overflows malloc site hashtable bucket

 * @library /testlibrary /testlibrary/whitebox

 * @ignore - This test is disabled since it will stress NMT and timeout during normal testing

 * @build MallocSiteHashOverflow

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 * @run main/othervm/timeout=480 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocSiteHashOverflow

 */

import com.oracle.java.testlibrary.*;

import sun.hotspot.WhiteBox;

public class MallocSiteHashOverflow {

    private static long K = 1024;

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

        String vm_name = System.getProperty("java.vm.name");

        // For 32-bit systems, create 257 malloc sites with the same hash bucket to overflow a hash bucket

        // For 64-bit systems, create 64K + 1 malloc sites with the same hash bucket to overflow a hash bucket

        long entries = 257;

        if (Platform.is64bit()) {

            entries = 64 * K + 1;

        }

        OutputAnalyzer output;

        WhiteBox wb = WhiteBox.getWhiteBox();

        // Grab my own PID

        String pid = Integer.toString(ProcessTools.getProcessId());

        ProcessBuilder pb = new ProcessBuilder();

        wb.NMTOverflowHashBucket(entries);

        // Run 'jcmd <pid> VM.native_memory summary'

        pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});

        output = new OutputAnalyzer(pb.start());

        output.shouldContain("Tracking level has been downgraded due to lack of resources");

    }

}