Re: [RFC 7/8] Make GRUB a task's flag

From: Peter Zijlstra
Date: Thu Jan 14 2016 - 14:56:59 EST


On Thu, Jan 14, 2016 at 04:24:52PM +0100, Luca Abeni wrote:
> +++ b/include/uapi/linux/sched.h
> @@ -48,5 +48,6 @@
> * For the sched_{set,get}attr() calls
> */
> #define SCHED_FLAG_RESET_ON_FORK 0x01
> +#define SCHED_FLAG_RECLAIM 0x02

With an eye towards unpriv usage of SCHED_DEADLINE, this isn't something
we could allow unpriv tasks, right? Since (IIRC) GRUB will allow eating
all !deadline time.

Something with an average runtime/budget that also puts limits on the
max (say 2*avg) would be far more amenable to be exposed to unpriv
tasks, except since that would directly result in an average tardiness
bound this might be non-trivial to combine with tasks not opting for
this.