linux-kernel - Re: [PATCH] perfmon: add context switch hooks for x86

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Message-ID: <4821BD2A.3090000@firstfloor.org>
Date:	Wed, 07 May 2008 16:31:06 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	stephane eranian <eranian@...glemail.com>
CC:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, tglx@...utronix.de
Subject: Re: [PATCH] perfmon: add context switch hooks for x86

stephane eranian wrote:
> Andi,
> 
> It would be much bigger because it would pull in a bunch of generic
> and model-specific
> data structures and code.
> 
> To context switch, you need to know what the registers are, thus you
> need the PMU
> mapping table, which is implemented by a kernel module, so it needs
> its registration
> framework....

Can you strip it down to be simpler?

Minimally generic x86 perfctr switching code just needs an array with
MSR numbers, doesn't it? And there are only a few variants.

-Andi
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