linux-kernel - Re: [PATCH 1/3] perf-events: Add support for supplementary event registers

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Date:	Thu, 11 Nov 2010 20:45:07 +0100
From:	Andi Kleen <ak@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	fweisbec@...il.com, mingo@...e.hu, acme@...hat.com,
	eranian@...gle.com
Subject: Re: [PATCH 1/3] perf-events: Add support for supplementary event
 registers

On 11/11/2010 8:36 PM, Peter Zijlstra wrote:
>
> Can we make it so, that is, move that int inside the intel_percore
> struct?
>

It's needed per cpu. Basically the flag says "bother to look into the 
percore structure"
This way most of this is kept out of the fast paths. But one CPU in a core
may need it and the other not.

In principle it could be merged into some other cpuc flag word if you 
have any suggestions.

>
> Hrm,.. but we only need to do this on nhm/wsm init, we already have code
> detecting the cpu model. And I'm quite sure you know where to poke to
> see if HT is enabled.

Ok I guess I can do a dynamic per cpu allocation for this case.

-Andi
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