Re: [PATCH v4] sched: automated per session task groups

Peter Zijlstra
2010-12-01T11:34:41Z

On Tue, 2010-11-30 at 19:39 -0800, Paul Turner wrote:
> On 11/28/10 06:24, Mike Galbraith wrote:
> > On Thu, 2010-11-25 at 09:00 -0700, Mike Galbraith wrote:
> >
> >> My vacation is (sniff) over, so I won't get a fully tested patch out the
> >> door for review until I get back home.
> >
> > Either I forgot to pack my eyeballs, or laptop is just too dinky and
> > annoying. Now back home on beloved box, this little bugger poked me
> > dead in the eye.
> >
> > Something else is seriously wrong though. 36.1 with attached (plus
> > sched, cgroup: Fixup broken cgroup movement) works a treat, whereas
> > 37.git and tip with fixlet below both suck rocks. With a make -j40
> > running, wakeup-latency is showing latencies of>100ms, amarok skips,
> > mouse lurches badly.. generally horrid. Something went south.
> >
>
> I'm looking at this.
>
> The share:share ratios looked good in static testing, but perhaps we
> need a little more wake-up boost to improve interactivity.
>
> Should have something tomorrow.

Right, the previous thing cheated quite enormous with wakeups simply
because it was way too expensive to compute proper shares on wakeups.

Maybe we should re-instate some of that cheating.