Re: [PATCH 03/20] x86, mce: Add persistent MCE event

[Borislav Petkov <bp@amd64.org>]

On Thu, Nov 11, 2010 at 10:38:50AM -0500, Peter Zijlstra wrote:
> On Thu, 2010-11-11 at 14:34 +0100, Borislav Petkov wrote:
> > 3) enable the persistent event and stash its fd in some /sysfs member
> > which the RAS daemon reads out and mmaps. This last one actually sounds
> > pretty neat. 
> 
> Right, stashing the thing in sysfs, which you can open()+mmap() seems
> the best way. Not sure you want to make it a RAS specific place, maybe a
> generic persistent buffer place.
> 
> You'll get multiple files anyway, one per cpu, so maybe something like:
> 
> /sysfs/persistent_buffer/ras[0..n]

Yeah, or even integrate it even further into the events hierarchy like
this:

/sys/.../cpu/events/mce		-> this is the trace_mce_record tracepoint
/sys/.../cpu/events/mce_pers	-> persistent buffer fd

or an additional level further down

/sys/.../cpu/events/mce/persistent/...

or whatever.

Generally I don't care too much where we put it at the end.

Thanks.

-- 
Regards/Gruss,
Boris.

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