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Message-ID: <7c86c4470805080942v4b3c17a7jacf5e14eb21b1345@mail.gmail.com>
Date: Thu, 8 May 2008 08:42:35 -0800
From: "stephane eranian" <eranian@googlemail.com>
To: "Andi Kleen" <andi@firstfloor.org>
Subject: Re: [PATCH] perfmon: add context switch hooks for x86
Cc: linux-kernel@vger.kernel.org, "Andrew Morton" <akpm@linux-foundation.org>,
       "Ingo Molnar" <mingo@elte.hu>, tglx@linutronix.de
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Andi,

It is not necessarily that easy. I will lok at this next week.

On 5/7/08, Andi Kleen <andi@firstfloor.org> wrote:
> 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
>