Re: CFS review

[Roman Zippel <zippel@linux-m68k.org>]

Hi,

On Wed, 1 Aug 2007, Andi Kleen wrote:

> > especially if one already knows that
> > scheduler clock has only limited resolution (because it's based on
> > jiffies), it becomes possible to use mostly 32bit values.
> 
> jiffies based sched_clock should be soon very rare. It's probably
> not worth optimizing for it.

I'm not so sure about that. sched_clock() has to be fast, so many archs 
may want to continue to use jiffies. As soon as one does that one can also 
save a lot of computational overhead by using 32bit instead of 64bit.
The question is then how easy that is possible.

bye, Roman
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