>
> Basically it's a matter of :
>
> task_struct *
> EIP/Event
> EIP/Event
> EIP/Event
> EIP/Event
> ....
I think you can easily do that by keeping state per cpu in the
NMI handler.
if (current == __get_cpu_var(oprofile_cpustate)) {
/* log current */
__get_cpu_var(oprofile_cpustate) = current;
} else {
/* do nothing */
}
/* log EIP */
[or when you are an module use an cache line padded array indexed with
smp_processor_id - per cpu data doesn't work from modules]
This is even more efficient because when the NMI rate is lower than
the task switch frequency (which is not unlikely) then you'll avoid
many useless task_struct loggings.
-Andi
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This archive was generated by hypermail 2b29 : Mon Sep 30 2002 - 22:00:39 EST