Re: [announce] CFS-devel, performance improvements

From: Peter Zijlstra
Date: Thu Sep 13 2007 - 13:10:13 EST


On Thu, 2007-09-13 at 19:06 +0200, Peter Zijlstra wrote:
> On Thu, 2007-09-13 at 18:50 +0200, Roman Zippel wrote:
>
> > I never claimed to understand every detail of CFS, I can _guess_ what
> > _might_ have been intended, but from that it's impossible to know for
> > certain how important they are. Let's take this patch fragment:
> >
>
> delta_fair = se->delta_fair_sleep;
>
> we slept that much
>
> > - /*
> > - * Fix up delta_fair with the effect of us running
> > - * during the whole sleep period:
> > - */
> > - if (sched_feat(SLEEPER_AVG))
> > - delta_fair = div64_likely32((u64)delta_fair * load,
> > - load + se->load.weight);
>
> if we would have ran we would not have been removed from the rq and the
> weight would have been: rq_weight + weight
>
> so compensate for us having been removed from the rq by scaling the
> delta with: rq_weight/(rq_weight + weight)
>
> > - delta_fair = calc_weighted(delta_fair, se);
>
> scale for nice levels
>

Or at least, I think that is how to read it :-)

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