Re: static scheduling - SCHED_IDLE?

Rik van Riel
2001-03-09T19:54:32Z

On Fri, 9 Mar 2001, george anzinger wrote:
> Rik van Riel wrote:
> > On Thu, 8 Mar 2001, Boris Dragovic wrote:
> >
> > > > Of course. Now we just need the code to determine when a task
> > > > is holding some kernel-side lock ;)
> > >
> > > couldn't it just be indicated on actual locking the resource?
> >
> > It could, but I doubt we would want this overhead on the locking...
>
> Seems like you are sneaking up on priority inherit mutexes.
> The locking over head is not so bad (same as spinlock, except in
> UP case, where it is the same as the SMP case). The unlock is,
> however, the same as the lock overhead. It is hard to beat the
> store of zero which is the spin_unlock.

Hmmm, what would this look like ?

(we need the same code if we want to do decent load
control for the VM, where we suspend tasks when the
load gets too high)

Rik
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