linux-kernel - Re: [PATCH 1/5] perf, x86: Don't assume the alternative cycles encoding is architectural

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Date:	Wed, 6 Jun 2012 18:08:48 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andi Kleen <ak@...ux.intel.com>, Andi Kleen <andi@...stfloor.org>,
	linux-kernel@...r.kernel.org, eranian@...gle.com
Subject: Re: [PATCH 1/5] perf, x86: Don't assume the alternative cycles encoding is architectural

On Wed, Jun 06, 2012 at 04:53:05PM +0200, Peter Zijlstra wrote:
> 
> > So your patch would fix the problem iff you only fill in the pebs_aliases
> > in the model number switch for known Core model numbers.
> 
> +       if (event->attr.precise_ip && x86_pmu.pebs_aliases)
> +               x86_pmu.pebs_aliases(event);
> 
> Never happens, and we're happy again.

How about newer unknown Intel CPUs with arch_perfmon >= 3? Those would get 
intel_pmu, correct?  There's no guarantee that they support the trick.

-Andi


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