Re: [PATCH -v3] perf, x86: try to handle unknown nmis with runningperfctrs

[Cyrill Gorcunov]

On Wed, Aug 25, 2010 at 05:20:37PM -0400, Don Zickus wrote:
... 
> The only problem is only one counter is overflowing in these cases, so we
> would have to do it all the time, which may not be hard.  But I was
> thinking of something similar.
> 
> For now, I am trying to force counter0 off, seeing that most of the perf
> errata on nehalem have been on counter0.  Or maybe I can get 'perf top' to
> use something other than counter0 by running 'perf record' first?
> 
> Cheers,
> Don
> 
> > 
> > 	-- Cyrill
> 

Well, I never looked deep inside perf tool code itself. Perhaps the easiest
(if you want to disable counter0) is just disable it in kernel and see how
it goes, no?

	-- Cyrill
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