linux-kernel - Re: [patch] Re: autogroup: sched

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Date:	Tue, 15 Feb 2011 16:46:12 +0100
From:	torbenh <torbenh@....de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Mike Galbraith <efault@....de>, Yong Zhang <yong.zhang0@...il.com>,
	bharata@...ux.vnet.ibm.com, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] Re: autogroup: sched_setscheduler() fails

On Mon, Jan 17, 2011 at 02:16:00PM +0100, Peter Zijlstra wrote:
> On Thu, 2011-01-13 at 04:54 +0100, Mike Galbraith wrote:
> > sched, autogroup: fix CONFIG_RT_GROUP_SCHED sched_setscheduler() failure.
> > 
> > If CONFIG_RT_GROUP_SCHED is set, __sched_setscheduler() fails due to autogroup
> > not allocating rt_runtime.  Free unused/unusable rt_se and rt_rq, redirect RT
> > tasks to the root task group, and tell __sched_setscheduler() that it's ok.
> > 
> > Signed-off-by: Mike Galbraith <efault@....de>
> > Reported-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
> 
> Thanks, applied!

while this behaviour is certeinly necessary, i think this is a hack.
it fixes the problem for autogroups.
But its not fixed for things which want to control the cfs shares via
normal cgroups. 

why isnt rt_runtime_us residing in a separate (new) subsystem ?


-- 
torben Hohn
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