Re: Trying out SCHED_BATCH

[Peter Williams]

Bill Davidsen wrote:
> Andrew Morton wrote:
>
> > Paolo Ciarrocchi <paolo.ciarrocchi@xxxxxxxxx> wrote:
> >
> > > Andrew, what's your plan for the staircase scheduler ?
> >
> >
> >
> > I have none, frankly.  I haven't seen any complaints about the current
> > scheduler.
> >
> > If someone can identify bad behaviour in the current scheduler which
> > staircase improves then please describe a tescase which the scheduler
> > developers can use to reproduce the situation.
>
>
> Of course that may result in just another band-aid on the current 
> scheduler rather than a change.
>
> > If, after that, we deem that the problem cannot be feasibly fixed 
> > within the
> > context of the current scheduler and that the problem is sufficiently
> > serious to justify wholesale replacement of the scheduler then sure,
> > staircase is an option.
>
>
> More to the point, was there a problem with plugable schedulers? It 
> would be both technically and politically better to let people try, use, 
> and write schedulers for special case loads, just as we have for io 
> scheduling.
>
> I didn't find staircase to be the solution to any of my problems, but it 
> would be nice to let all the people who are improving schedulers have an 
> easy way to try new ideas (easier than building a whole new kernel, that 
> is).

At Con's request I've taken over responsibility for plugsched but I've 
been away visiting relatives for the last week or so and, therefore, I'm 
a little behind.  I hope to release a plugsched patch for 2.6.10 in the 
next few days with a (work in progress) modification to share a lot more 
code between schedulers so that the amount of work required to implement 
new schedulers is reduced.

Peter
--
Peter Williams                                   pwil3058@xxxxxxxxxxxxxx

"Learning, n. The kind of ignorance distinguishing the studious."
 -- Ambrose Bierce
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