#!/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. class_loading_stat.d -c "java ..." INTERVAL_SECS

 *    2. class_loading_stat.d -p JAVA_PID INTERVAL_SECS

 *

 * This script collects statistics about loaded and unloaded Java classes

 * and dump current state to stdout every INTERVAL_SECS seconds.  If

 * INTERVAL_SECS is not set then 10 seconds interval is used.

 *

 */

#pragma D option quiet

#pragma D option destructive

#pragma D option defaultargs

#pragma D option aggrate=100ms

self char *str_ptr;

self string class_name;

self string package_name;

int INTERVAL_SECS;

:::BEGIN

{

    SAMPLE_NAME = "hotspot class loadin tracing";

    INTERVAL_SECS = $1 ? $1 : 10;

    SAMPLING_TIME = timestamp + INTERVAL_SECS * 1000000000ull;

    LOADED_CLASSES_CNT = 0;

    UNLOADED_CLASSES_CNT = 0;

    LINE_SEP =

    "------------------------------------------------------------------------";

    printf("BEGIN %s\n\n", SAMPLE_NAME);

}

/*

 * hotspot:::class-loaded, hotspot:::class-unloaded probe arguments:

 *  arg0: char*,        class name passed as mUTF8 string

 *  arg1: uintptr_t,    class name length

 *  arg2: void*,        class loader ID, which is unique identifier for

 *                      a class loader in the VM.

 *  arg3: uintptr_t,    class is shared or not

 */

hotspot$target:::class-loaded

{

    LOADED_CLASSES_CNT ++;

    self->str_ptr = (char*) copyin(arg0, arg1+1);

    self->str_ptr[arg1] = '\0';

    self->class_name = (string) self->str_ptr;

    self->package_name = dirname(self->class_name);

    @classes_loaded[self->package_name] = count();

}

hotspot$target:::class-unloaded

{

    UNLOADED_CLASSES_CNT ++;

    self->str_ptr = (char*) copyin(arg0, arg1+1);

    self->str_ptr[arg1] = '\0';

    self->class_name = (string) self->str_ptr;

    self->package_name = dirname(self->class_name);

    @classes_unloaded[self->package_name] = count();

}

tick-1sec

/timestamp > SAMPLING_TIME/

{

    printf("%s\n", LINE_SEP);

    printf("%Y\n", walltimestamp);

    printf("%s\n", LINE_SEP);

    printf("Loaded classes by package:\n");

    printa("%10@d %s\n", @classes_loaded);

    printf("\n");

    printf("Unloaded classes by package:\n");

    printa("%10@d %s\n", @classes_unloaded);

    printf("\n");

    printf("Number of loaded classes: %10d\n", LOADED_CLASSES_CNT);

    printf("Number of unloaded classes: %10d\n", UNLOADED_CLASSES_CNT);

    SAMPLING_TIME = timestamp + INTERVAL_SECS * 1000000000ull;

}

:::END

{

    printf("%s\n", LINE_SEP);

    printf("%Y\n", walltimestamp);

    printf("%s\n", LINE_SEP);

    printf("Loaded classes by package:\n");

    printa("%10@d %s\n", @classes_loaded);

    printf("\n");

    printf("Unloaded classes by package:\n");

    printa("%10@d %s\n", @classes_unloaded);

    printf("\n");

    printf("Number of loaded classes: %10d\n", LOADED_CLASSES_CNT);

    printf("Number of unloaded classes: %10d\n", UNLOADED_CLASSES_CNT);

    printf("\nEND of %s\n", SAMPLE_NAME);

}

syscall::rexit:entry,

syscall::exit:entry

/pid == $target/

{

   exit(0);

}