Java example source code file (hotspot_jni_calls_stat.d)

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Java - Java tags/keywords

begin, end, jni_calls, total

The hotspot_jni_calls_stat.d Java example source code

#!/usr/sbin/dtrace -Zs

/*
 * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
*/

/*
 * Usage:
 *    1. hotspot_jni_calls_stat.d -c "java ..."
 *    2. hotspot_jni_calls_stat.d -p JAVA_PID
 *
 * This script collects statistics about how many times particular JNI
 * method has been called.
 *
 */


#pragma D option quiet
#pragma D option destructive
#pragma D option defaultargs
#pragma D option bufsize=16m
#pragma D option aggrate=100ms


:::BEGIN
{
    printf("BEGIN hotspot_jni tracing\n");
}


hotspot_jni$target:::*-entry
{
    JNI_CALLS ++;
    @jni_calls[probename] = count();
}

:::END
{
    printa("%10@d %s\n", @jni_calls);
    printf("\n");
    printf("Total number of JNI calls: %d\n", JNI_CALLS);

    printf("\nEND hotspot_jni tracing.\n");
}

syscall::rexit:entry,
syscall::exit:entry
/pid == $target/
{
   exit(0);
}