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

From: Al Boldi
Date: Wed Jul 26 2006 - 00:42:22 EST

Peter Williams wrote:
> 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.

Maybe you are thinking of running independent run-queues, in which case it
would probably be unwise to run multiple RQs on a single CPU.

But I was more thinking of a run-queue of run-queues, with the masterRQ
scheduling slaveRQs, each RQ possible running its own scheduling semantic.



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