profiling functions called in interrupt context
From: anish singh <hidden>
Date: 2011-09-20 11:10:37
On Tue, Sep 20, 2011 at 4:11 PM, Nuno Martins [off-list ref] wrote:
On Tue, Sep 20, 2011 at 5:59 AM, Amit Nagal [off-list ref] wrote:quoted
On Tue, Sep 20, 2011 at 10:25 AM, rohan puri [off-list ref] wrote:quoted
On Tue, Sep 20, 2011 at 10:13 AM, Amit Nagal [off-list ref] wrote:quoted
On Tue, Sep 20, 2011 at 10:05 AM, rohan puri [off-list ref] wrote:quoted
On Tue, Sep 20, 2011 at 9:44 AM, Amit Nagal [off-list ref] wrote:quoted
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 NagalFor this you can make use of ftrace. Refer link http://www.mjmwired.net/kernel/Documentation/trace/ftrace.txt Regards, RohanTools 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 NagalHi Amit, I think ftrace can be enabled and used on arm arch. Please Refer http://www.omappedia.org/wiki/Installing_and_Using_Ftrace Regards, RohanOk , ?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
quoted
Regards Amit Nagal _______________________________________________ Kernelnewbies mailing list Kernelnewbies at kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies-- Nuno Martins _______________________________________________ Kernelnewbies mailing list Kernelnewbies at kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies