profiling functions called in interrupt context

[rohan puri]

On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal <helloin.amit at gmail.com> wrote:

> Hi ,
>
> i want to measure time spend in a callback function called from
> interrupt context .
> since the time spend will be in us / ns , what kernel apis can i use
> to measure it ?
>
> also since i want to use it in interrupt context  , kernel time
> measurement apis should not sleep .
> i am using embedded arm target , and tools like OProfile  are not available
> .
>
> can i be guided which  kernel time measurement apis shall i use to
> measure time in a interrupt callback ?
>
> Regards
> Amit Nagal
>
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Hi Amit,

For this you can make use of ftrace.

Refer link http://www.mjmwired.net/kernel/Documentation/trace/ftrace.txt

Regards,
Rohan
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