From mboxrd@z Thu Jan  1 00:00:00 1970
From: j.vimal@gmail.com (Vimal)
Date: Mon, 21 Mar 2011 00:02:29 -0700
Subject: User space context switch
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To: kernelnewbies@lists.kernelnewbies.org
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Hi Mohit,

On 18 March 2011 13:07, mohit verma <mohit89mlnc@gmail.com> wrote:
> hi all,
> ??is it possible to write a user space code to calculate the context switch
> time of a process ? I mean , how can the user space code know about the
> working of the scheduler?
> Is there any system call API to interact with scheduler or something other
> to interact with , regarding ?this problem?

Do check the function tracing framework in the Linux Kernel.

Links:
* http://lwn.net/Articles/322666/
* http://lwn.net/Articles/290277/

sched_switch is the tracer you're looking for.

-- 
Vimal