Re: 2.5.74-mm1

From: Jamie Lokier (
Date: Sat Jul 05 2003 - 20:28:57 EST

Daniel Phillips wrote:
> What are you going to do if you have one
> application you want to take priority, re-nice the other 50?

Is that effective? It might be just the trick.

> > Something I've often thought would fix this is to allow normal users
> > to set negative priority which is limited to using X% of the CPU -
> > i.e. those tasks would have their priority raised if they spent more
> > than a small proportion of their time using the CPU.
> That's essentially SCHED_RR. As I mentioned above, it's not clear
> to me why SCHED_RR requires superuser privilege, since the amount of
> CPU you can burn that way is bounded. Well, the total of all
> SCHED_RR processes would need to be bounded as well, which is
> straightforward.

Your last point is most important. At the moment, a SCHED_RR process
with a bug will basically lock up the machine, which is totally
inappropriate for a user app.

-- Jamie
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