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// Task time query and utility functions.
// Copyright (C) 2009 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
// <tapsetdescription>
// Task time query and utility functions provide information about
// the time resource usage of the current task. These functions provide
// information about the user time and system time of the current
// task. And provide utility functions to turn the reported times
// into miliseconds and create human readable string representations
// of task time used. The reported times are approximates and should
// be used for "coarse grained" measurements only. The reported user
// and system time are only for the current task, not for the process
// as a whole nor of any time spend by children of the current task.
// </tapsetdescription>
%{
#include <asm/cputime.h>
#include <linux/time.h>
%}
/**
* sfunction task_utime - User time of the current task.
*
* Description: Returns the user time of the current task in cputime.
* Does not include any time used by other tasks in this process, nor
* does it include any time of the children of this task.
*/
function task_utime:long ()
%{ /* pure */ /* unprivileged */
THIS->__retvalue = current->utime;
%}
/**
* sfunction task_stime - System time of the current task.
*
* Description: Returns the system time of the current task in cputime.
* Does not include any time used by other tasks in this process, nor
* does it include any time of the children of this task.
*/
function task_stime:long ()
%{ /* pure */ /* unprivileged */
THIS->__retvalue = current->stime;
%}
/**
* sfunction cputime_to_msecs - Translates the given cputime into milliseconds.
* @cputime: Time to convert to milliseconds.
*/
function cputime_to_msecs:long (cputime:long)
%{ /* pure */ /* unprivileged */
THIS->__retvalue = cputime_to_msecs (THIS->cputime);
%}
/**
* sfunction msecs_to_string - Human readable string for given milliseconds.
* @msecs: Number of milliseconds to translate.
*
* Description: Returns a string representing the number of
* milliseconds as a human readable string consisting of "XmY.ZZZs",
* where X is the number of minutes, Y is the number of seconds and
* ZZZ is the number of milliseconds.
*/
function msecs_to_string:string (msecs:long)
{
ms = msecs % 1000;
secs = msecs / 1000;
mins = secs / 60;
secs = secs % 60;
return sprintf("%dm%d.%.3ds", mins, secs, ms);
}
/**
* sfunction cputime_to_string - Human readable string for given cputime.
* @cputime: Time to translate.
*
* Description: Equivalent to calling:
* msec_to_string (cputime_to_msecs (cputime).
*/
function cputime_to_string:string (cputime:long)
{
return msecs_to_string (cputime_to_msecs (cputime));
}
/**
* sfunction task_time_string - Human readable string of task time usage.
*
* Description: Returns a human readable string showing the user and
* system time the current task has used up to now. For example
* "usr: 0m12.908s, sys: 1m6.851s".
*/
function task_time_string:string ()
{
return sprintf ("usr: %s, sys: %s",
cputime_to_string (task_utime()),
cputime_to_string (task_stime()));
}
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