Re: CFS review

[Andi Kleen]

On Wed, Aug 01, 2007 at 04:36:24PM +0200, Ingo Molnar wrote:
> 
> * Roman Zippel <zippel@xxxxxxxxxxxxxx> wrote:
> 
> > > 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. [...]
> 
> i think Andi was talking about the vast majority of the systems out 
> there. For example, check out the arch demography of current Fedora 
> installs (according to the Smolt opt-in UUID based user metrics):

I meant that in many cases where the TSC is considered unreliable
today it'll be possible to use it anyways at least for sched_clock()
(and possibly even gtod()) 

The exception would be system which really have none, but there
should be very few of those.

-Andi
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