Re: [PATCH 1/5] perf, x86: Don't assume the alternative cyclesencoding is architectural

[Andi Kleen]

On Wed, Jun 06, 2012 at 12:39:48PM +0200, Peter Zijlstra wrote:
> On Tue, 2012-06-05 at 17:56 -0700, Andi Kleen wrote:
> > From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> > 
> > cycles:p uses an special cycles encoding by default. However that is not
> > architectural, so it can only be used when the CPU is known
> > (it already caused problems on Sandy Bridge). It may or may not work
> > on future CPUs.
> > 
> > So make it opt-in only. Right now I enabled it on Core2, Nehalem, Westmere
> > and not on Sandy-Bridge or Atom.
> 
> No. 

What do you mean? Are you claiming it's architectural?

> Also, c0 is a PEBS capable event on Atom just fine.

Ok can enable it there.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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