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
signature.asc
Description: This is a digitally signed message part
