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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
