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

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Message-ID: <20100806114611.GE1981@jolsa.brq.redhat.com>
Date:	Fri, 6 Aug 2010 13:46:11 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	mingo@...e.hu, rostedt@...dmis.org, yhlu.kernel@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 0/2] apic: tracing IPI events

On Fri, Aug 06, 2010 at 01:26:36PM +0200, Andi Kleen wrote:
> Jiri Olsa <jolsa@...hat.com> 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..

jirka

> 
> -Andi
> -- 
> ak@...ux.intel.com -- Speaking for myself only.
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