On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal [off-list ref] 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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