Get local CPU id

[Valdis.Kletnieks at vt.edu]

On Sun, 08 Mar 2015 22:49:00 +0100, Maxime Ripard said:

> On Sun, Mar 08, 2015 at 10:06:23PM +0300, Matwey V. Kornilov wrote:

> > I would like to somehow obtain local CPU core ID in the interrupt
> > handler function. I want to see how my interruptions are distributed
> > among different CPU cores under different conditions.

> > How should I do that?
>
> To answer strictly your question, like Nick said, smp_processor_id()
> will work fine.
>
> However, you can do exactly what you want be reading /proc/interrupts,
> that already provide the informations you are looking for.

Clarification:  /proc/interrupts will give userspace that information.
It is *not* recommended you try to read it from kernel space, much less
from an interrupt context... :)
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