linux-kernel - Re: [PATCH 1/2] perf-events: Add support for supplementary event registers v2

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Message-ID: <1289644367.2084.526.camel@laptop>
Date:	Sat, 13 Nov 2010 11:32:47 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	eranian@...gle.com, linux-kernel@...r.kernel.org,
	cjashfor@...ux.vnet.ibm.com, mingo@...e.hu, fweisbec@...il.com,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/2] perf-events: Add support for supplementary event
 registers v2

On Sat, 2010-11-13 at 11:13 +0100, Andi Kleen wrote:
> > Hrmm,. this doesn't really scale right wrt multiple extra_regs.
> > 
> > You made the extra_regs thing fairly extensible, but the above doesn't
> > really work well if there's multiple extra regs (say OFFCORE and
> > LBR_CONFIG -- possibly even the two OFFCORE regs present on westmere).
> > 
> > It basically needs a per-core state for each extra_reg possible.
> 
> It shouldn't be too hard to extend it to use a table. I didn't want
> to do that for the first iteration. I guess it could be done as followons
> once LBR is implemented.

Isn't it also relevant for the two offcore regs for wsm?
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