Re: [patch] SCHED_SOFTRR linux scheduler policy ...

Alan Cox (
13 Jul 2003 12:53:31 +0100

On Sul, 2003-07-13 at 12:50, Pavel Machek wrote:
> Hi!
> > I finally found a couple of hours for this and I also found a machine were
> > I can run 2.5, since luck abandoned myself about this. The small page
> > describe the obvious and contain the trivial patch and the latecy test app :
> >
> >
> What happens if evil user forks 60 processes, marks them all
> SCHED_SOFTRR, and tries to starve everyone else?

With the current scheduler you lose. Rik did some playing with a fair
share scheduler some time ago. That actually works very well for a lot
of these sorts of things. You can nice processes up (but only by
penalising your own processes) and conceptually you'd be able to soft
real time on a per user basis this way.


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