Re: [PATCH] V-3.0 Single Priority Array O(1) CPU Scheduler Evaluation

Andrew Morton
2004-08-03T03:55:24Z

Peter Williams <pwil3058@bigpond.net.au> wrote:
>
> > Have you considered submitting one to -mm* for wider testing?
>
> I've made patches available for 2.6.8-rc2-mm1 and I'll provide them for
> mm2 as soon as possible. Is there something else I should be doing?

I'll probably drop staircase soon, give nicksched a whizz for a couple of
cycles. You're welcome to join the queue ;)

But let me re-repeat again that CPU scheduler problems tend to take a
_long_ time to turn up - you make some change and two months later some
person with a weird workload on expensive hardware hits a nasty corner
case. So I do think that we'd have to hit a nasty problem with the current
scheduler to go making deep changes.

Although most of the fragility has been in CPU/node/HT balancing rather
than in the timeslice allocation area. I assume you're not touching the
former. It's the desktop users who seem to be more affected by the
timeslice allocation algorithms, and the testing turnaround is much faster
there.