Re: It hurts when I shoot myself in the foot

From: Kasper Dupont (kasperd@daimi.au.dk)
Date: Fri May 24 2002 - 10:36:27 EST

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Alan Cox wrote:
>
> > If the kernel knew multipliers couldn't it actually use the TSCs
> > anyway? Of course it would take some work, but is there any
> > reason why it would not be posible?
>
> In 2.4 yes. In 2.5 it would be close to impossible due to the pre-empt code

Couldn't that be solved in one of the following ways?

1) Disable pre-emption while reading TSC and CPU nr.
2) Use affinity for processes pre-empted in kernel mode.
3) Disable pre-emption for SMP systems.

-- 
Kasper Dupont -- der bruger for meget tid p� usenet.
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