linux-kernel - Re: [PATCH] sched/rt: fix SCHED

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Date:	Wed, 23 May 2012 15:32:24 +0200
From:	Dario Faggioli <raistlin@...ux.it>
To:	Colin Cross <ccross@...roid.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Hillf Danton <dhillf@...il.com>
Subject: Re: [PATCH] sched/rt: fix SCHED_RR across cgroups

On Sat, 2012-05-19 at 13:37 -0700, Colin Cross wrote:
> > I would say it is. That's what you get because of putting task1 and
> > cgroup at the same level in the "hierarchy". I'm curious, what kind of
> > behaviour were you expecting?
> 
> That behavior matches exactly with scheduling of normal tasks and
> cgroups with default cpu.shares, but doesn't match too well with what
> I can see of the posix SCHED_RR description, which suggests all the
> SCHED_RR threads go into a single queue.  I was just curious if the
> behavior my patch restored was correct, since it can't be adjusted by
> tweaking any parameters like cpu.shares.
> 
Again, I really think it is the intended behaviour, and yes, real-time
group scheduling "breaks" the POSIX specification of the SCHED_{FIFO,RR}
policies intentionally (and _proudly_, as Peter would say it, am I
wrong? :-P).

Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://retis.sssup.it/people/faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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