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

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Message-ID: <7c86c4470805080942v4b3c17a7jacf5e14eb21b1345@mail.gmail.com>
Date:	Thu, 8 May 2008 08:42:35 -0800
From:	"stephane eranian" <eranian@...glemail.com>
To:	"Andi Kleen" <andi@...stfloor.org>
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

Andi,

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

On 5/7/08, Andi Kleen <andi@...stfloor.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
>
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