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 :-) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
