Re: [PATCH] Make idle iopriority class safe for non-root

[Ingo Molnar <mingo@elte.hu>]

* Jens Axboe <jens.axboe@oracle.com> wrote:

> Hi,
> 
> Currently you must be root to set idle io prio class on a process. 
> This is due to the fact that the idle class is implemented as a true 
> idle class, meaning that it will not make progress if someone else is 
> requesting disk access. Unfortunately this means that it opens DOS 
> opportunities by locking down file system resources, hence it is root 
> only at the moment.
> 
> This patch relaxes the idle class a little, by removing the truly idle 
> part (which entals a grace period with associated timer). The 
> modifications make the idle class as close to zero impact as can be 
> done while still guarenteeing progress. This means we can relax the 
> root only criteria as well.

nice stuff!

	Ingo