Re: [RFC 0/2] apic: tracing IPI events

From: Jiri Olsa
Date: Fri Aug 06 2010 - 07:46:51 EST

On Fri, Aug 06, 2010 at 01:26:36PM +0200, Andi Kleen wrote:
> Jiri Olsa <jolsa@xxxxxxxxxx> writes:
> >
> > please let me know what you think
> You forgot to state why you want it?
> In generall the only case that should happen anytime commonly is mask,
> the others only for obscure uncommon paths.
> However there is already accounting for it in /proc/interrupts
> that can be easily sampled. Does adding additional tracing really give
> any value?

As I was asked to do that for other guys, I'm not completely sure.
Anyway the reason I got was, that while debuging crash it seemed
some IPIs might got lost.

Also it'd be probably used as a tracepoint itself via additional code,
than by ring buffer tracing.

I'll check if I can get more justifing info..


> -Andi
> --
> ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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