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
On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal <helloin.amit@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
On Tue, Sep 20, 2011 at 10:05 AM, rohan puri <rohan.puri15@gmail.com> wrote:
On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal <helloin.amit@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
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
On Tue, Sep 20, 2011 at 10:13 AM, Amit Nagal <helloin.amit@gmail.com> wrote:
On Tue, Sep 20, 2011 at 10:05 AM, rohan puri <rohan.puri15@gmail.com> wrote:
On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal <helloin.amit@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
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
On Tue, Sep 20, 2011 at 10:25 AM, rohan puri <rohan.puri15@gmail.com> wrote:
On Tue, Sep 20, 2011 at 10:13 AM, Amit Nagal <helloin.amit@gmail.com> wrote:
On Tue, Sep 20, 2011 at 10:05 AM, rohan puri <rohan.puri15@gmail.com> wrote:
On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal <helloin.amit@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
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
On Tue, Sep 20, 2011 at 5:59 AM, Amit Nagal <helloin.amit@gmail.com> wrote:
On Tue, Sep 20, 2011 at 10:25 AM, rohan puri <rohan.puri15@gmail.com> wrote:
On Tue, Sep 20, 2011 at 10:13 AM, Amit Nagal <helloin.amit@gmail.com>
wrote:
On Tue, Sep 20, 2011 at 10:05 AM, rohan puri <rohan.puri15@gmail.com> wrote:
On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal <helloin.amit@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
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
On Tue, Sep 20, 2011 at 4:11 PM, Nuno Martins <nuno.m.g.martins@gmail.com> wrote:
On Tue, Sep 20, 2011 at 5:59 AM, Amit Nagal <helloin.amit@gmail.com> wrote:
On Tue, Sep 20, 2011 at 10:25 AM, rohan puri <rohan.puri15@gmail.com> wrote:
On Tue, Sep 20, 2011 at 10:13 AM, Amit Nagal <helloin.amit@gmail.com> wrote:
On Tue, Sep 20, 2011 at 10:05 AM, rohan puri <rohan.puri15@gmail.com> wrote:
On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal <helloin.amit@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
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
participants (4)
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Amit Nagal -
anish singh -
Nuno Martins -
rohan puri