Re: [PATCH 01/13] sched: Add 3 new scheduler syscalls to support anextended scheduling parameters ABI
From: Peter Zijlstra
Date: Tue Jan 21 2014 - 10:46:40 EST
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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