On Wed, Aug 08, 2007 at 01:51:32PM +0400, Sheplyakov Alexei wrote:
> On Mon, Aug 06, 2007 at 01:11:01PM +0200, Andi Kleen wrote:
>
> > Very low priority can starve others when it holds some kernel resource
> > needed by another task.
>
> Nevertheless ordinary users are permitted to lower priority ([re]nice)
Low priority as allowed by renice is ok -- the resource holder will
run eventually and the system make progress.
> I don't quite understand. There are a lot of other ways to starve such
> high-priority process:
> 1. renice the low-priority process
That requires user action.
e.g. if you google a bit you can find a famous story where the NASA
had to do that remotely to solve a PI problem on one of the Mars rovers. But I'm
sure they weren't very pleased about it. And not everybody has a JPL
control room to patch things up in the backhand.
> 2. send it a signal
> 3. ptrace it
Only root can do these.
-Andi
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