On Tue, Sep 20, 2011 at 5:59 AM, Amit Nagal <helloin.amit@xxxxxxxxx> wrote:
Ok , thanks for the link . i will try the same .On Tue, Sep 20, 2011 at 10:25 AM, rohan puri <rohan.puri15@xxxxxxxxx> wrote:
>
>
> On Tue, Sep 20, 2011 at 10:13 AM, Amit Nagal <helloin.amit@xxxxxxxxx> wrote:
>>
>> On Tue, Sep 20, 2011 at 10:05 AM, rohan puri <rohan.puri15@xxxxxxxxx>
>> wrote:
>> >
>> >
>> > On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal <helloin.amit@xxxxxxxxx>
>> > 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
>> >
>> > For this you can make use of ftrace.
>> >
>> > Refer link http://www.mjmwired.net/kernel/Documentation/trace/ftrace.txt
>> >
>> > Regards,
>> > Rohan
>> >
>>
>> Tools like ftrace are not available to me in my embedded arm target .
>> So i want to use kernel apis to deal with time measurement in
>> interrupt context .
>>
>> Regards
>> Amit Nagal
>
> Hi Amit,
>
> I think ftrace can be enabled and used on arm arch.
> Please Refer http://www.omappedia.org/wiki/Installing_and_Using_Ftrace
>
> Regards,
> Rohan
>
Couldn't use ktimer, it says that is a high resolution timer inside the kernel, you could combine ktimer with kretprobe (you assing a function prior to the calling of your function and another when finished ). It is a instrumentation method inside the kernel.
Regards
Amit Nagal
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