Re: [PATCH 01/13] sched: Add 3 new scheduler syscalls to support anextended scheduling parameters ABI

[Peter Zijlstra]

On Tue, Jan 21, 2014 at 04:38:51PM +0100, Peter Zijlstra wrote:
>     SCHED_DEADLINE: Sporadic task model deadline scheduling
> 	SCHED_DEADLINE is an implementation of GEDF (Global Earliest
> 	Deadline First) with additional CBS (Constant Bandwidth Server).

We might want to re-word that to:

	SCHED_DEADLINE currently is an implementation of GEDF, however
	any policy that correctly schedules the sporadic task model is
	a valid implementation.

To make sure we should not rely on the actual implementation; there's
many possible algorithms to schedule the sporadic task model.

> 	The CBS guarantees that tasks that over-run their specified
> 	budget are throttled and do not affect the correct performance
> 	of other SCHED_DEADLINE tasks.
> 
> 	SCHED_DEADLINE tasks will fail FORK(2) with -EAGAIN
> 
> 	Setting SCHED_DEADLINE can fail with -EINVAL when admission
> 	control tests fail.
> 
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