#!/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. monitors.d -c "java ..."
* 2. monitors.d -p JAVA_PID
*
* The script traces monitor related probes.
*
* Notes:
* - These probes are disabled by default since it incurs performance
* overhead to the application. To trace the monitor-* probes, you need
* to turn on the ExtendedDTraceProbes VM option.
* You can either start the application with -XX:+ExtendedDTraceProbes
* option or use the jinfo command to enable it at runtime as follows:
*
* jinfo -flag +ExtendedDTraceProbes <java_pid>
*
*/
#pragma D option quiet
#pragma D option destructive
#pragma D option defaultargs
#pragma D option aggrate=100ms
self string thread_name;
self char* str_ptr;
:::BEGIN
{
SAMPLE_NAME = "hotspot monitors tracing";
printf("BEGIN %s\n\n", SAMPLE_NAME);
}
/*
* hotspot:::thread-start, hotspot:::thread-stop probe arguments:
* arg0: char*, thread name passed as mUTF8 string
* arg1: uintptr_t, thread name length
* arg2: uintptr_t, Java thread id
* arg3: uintptr_t, native/OS thread id
* arg4: uintptr_t, is a daemon or not
*/
hotspot$target:::thread-start
{
self->str_ptr = (char*) copyin(arg0, arg1+1);
self->str_ptr[arg1] = '\0';
self->thread_name = (string) self->str_ptr;
printf("thread-start: id=%d, is_daemon=%d, name=%s, os_id=%d\n",
arg2, arg4, self->thread_name, arg3);
threads[arg2] = self->thread_name;
}
hotspot$target:::thread-stop
{
self->str_ptr = (char*) copyin(arg0, arg1+1);
self->str_ptr[arg1] = '\0';
self->thread_name = (string) self->str_ptr;
printf("thread-stop: id=%d, is_daemon=%d, name=%s, os_id=%d\n",
arg2, arg4, self->thread_name, arg3);
}
/*
*
* hotspot::monitor-contended-enter, hotspot::monitor-contended-entered
*
* arg0: uintptr_t, the Java thread identifier for the thread peforming
* the monitor operation
* arg1: uintptr_t, a unique, but opaque identifier for the specific
* monitor that the action is performed upon
* arg2: char*, a pointer to mUTF-8 string data which contains the
* name of the class of the object being acted upon
* arg3: uintptr_t, the length of the class name (in bytes)
*/
hotspot$target:::monitor-contended-enter
{
/* (uintptr_t thread_id, uintptr_t monitor_id,
char* obj_class_name, uintptr_t obj_class_name_len) */
self->str_ptr = (char*) copyin(arg2, arg3+1);
self->str_ptr[arg3] = '\0';
self->class_name = (string) self->str_ptr;
monitors[arg1] = self->class_name;
monitors_enter[arg1] = arg0;
printf("%s: -> enter monitor (%d) %s\n",
threads[arg0], arg1, monitors[arg1]);
}
hotspot$target:::monitor-contended-entered
{
/* (uintptr_t thread_id, uintptr_t monitor_id, char* obj_class_name,
uintptr_t obj_class_name_len) */
monitors_entered[arg1] = arg0;
printf("%s: <- entered monitor (%d) %s\n",
threads[arg0], arg1, monitors[arg1]);
}
:::END
{
printf("\nEND of %s\n", SAMPLE_NAME);
}
syscall::rexit:entry,
syscall::exit:entry
/pid == $target/
{
exit(0);
}