Re: profiling functions called in interrupt context
On Tue, Sep 20, 2011 at 4:11 PM, Nuno Martins wrote: > > > On Tue, Sep 20, 2011 at 5:59 AM, Amit Nagal wrote: >> >> On Tue, Sep 20, 2011 at 10:25 AM, rohan puri >> wrote: >> > >> > >> > On Tue, Sep 20, 2011 at 10:13 AM, Amit Nagal >> > wrote: >> >> >> >> On Tue, Sep 20, 2011 at 10:05 AM, rohan puri >> >> wrote: >> >> > >> >> > >> >> > On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal >> >> > 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. kernel/Documentation/kprobes.txt > > >> >> Regards >> Amit Nagal >> >> ___ >> Kernelnewbies mailing list >> Kernelnewbies@kernelnewbies.org >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > > -- > Nuno Martins > > > ___ > Kernelnewbies mailing list > Kernelnewbies@kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: profiling functions called in interrupt context
On Tue, Sep 20, 2011 at 5:59 AM, Amit Nagal wrote: > On Tue, Sep 20, 2011 at 10:25 AM, rohan puri > wrote: > > > > > > On Tue, Sep 20, 2011 at 10:13 AM, Amit Nagal > wrote: > >> > >> On Tue, Sep 20, 2011 at 10:05 AM, rohan puri > >> wrote: > >> > > >> > > >> > On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal > >> > 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 > Kernelnewbies@kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- Nuno Martins ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: profiling functions called in interrupt context
On Tue, Sep 20, 2011 at 10:25 AM, rohan puri wrote: > > > On Tue, Sep 20, 2011 at 10:13 AM, Amit Nagal wrote: >> >> On Tue, Sep 20, 2011 at 10:05 AM, rohan puri >> wrote: >> > >> > >> > On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal >> > 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 . Regards Amit Nagal ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: profiling functions called in interrupt context
On Tue, Sep 20, 2011 at 10:13 AM, Amit Nagal wrote: > On Tue, Sep 20, 2011 at 10:05 AM, rohan puri > wrote: > > > > > > On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal > 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 ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: profiling functions called in interrupt context
On Tue, Sep 20, 2011 at 10:05 AM, rohan puri wrote: > > > On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal 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 ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: profiling functions called in interrupt context
On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal 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 > > ___ > Kernelnewbies mailing list > Kernelnewbies@kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > Hi Amit, For this you can make use of ftrace. Refer link http://www.mjmwired.net/kernel/Documentation/trace/ftrace.txt Regards, Rohan ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
profiling functions called in interrupt context
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 ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
