Re: [ANNOUNCE][RFC] PlugSched-6.4 for 2.6.18-rc2

[Peter Williams]

Al Boldi wrote:
> Peter Williams wrote:
> > Al Boldi wrote:
> > > Peter Williams wrote:
> > > > Al Boldi wrote:
[bits deleted]
> > > > > It may be really great, to allow schedulers perPid parent, thus
> > > > > allowing the stacking of different scheduler semantics.  This could
> > > > > aid flexibility a lot.
> > > > I'm don't understand what you mean here.  Could you elaborate?
> > > i.e:  Boot the kernel with spa_no_frills, then start X with spa_ws.
> > It's probably not a good idea to have different schedulers managing the
> > same resource.  The way to do different scheduling per process is to use
> > the scheduling policy mechanism i.e. SCHED_FIFO, SCHED_RR, etc.
> > (possibly extended) within each scheduler.  On the other hand, on an SMP
> > system, having a different scheduler on each run queue (or sub set of
> > queues) might be interesting :-).  
>
> What's wrong with multiple run-queues on UP?

A really high likelihood of starvation of some tasks.

Peter
--
Peter Williams                                   pwil3058@xxxxxxxxxxxxxx

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