On Tue, Sep 20, 2011 at 5:59 AM, Amit Nagal <[email protected]> wrote:
> On Tue, Sep 20, 2011 at 10:25 AM, rohan puri <[email protected]> > wrote: > > > > > > On Tue, Sep 20, 2011 at 10:13 AM, Amit Nagal <[email protected]> > wrote: > >> > >> On Tue, Sep 20, 2011 at 10:05 AM, rohan puri <[email protected]> > >> wrote: > >> > > >> > > >> > On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal <[email protected]> > >> > 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 > > > > Ok , thanks for the link . i will try the same . > 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 > > _______________________________________________ > Kernelnewbies mailing list > [email protected] > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- Nuno Martins
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