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

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Message-ID: <20110113084648.GA2982@in.ibm.com>
Date:	Thu, 13 Jan 2011 14:16:48 +0530
From:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
To:	Mike Galbraith <efault@....de>
Cc:	Yong Zhang <yong.zhang0@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [patch] Re: autogroup: sched_setscheduler() fails

On Thu, Jan 13, 2011 at 04:54:50AM +0100, Mike Galbraith wrote:
> (mailer switched me to work account again.  grrrr, switch yet again:)
> 
> On Wed, 2011-01-12 at 14:32 +0800, Yong Zhang wrote:
> 
> > Setting rt_runtime both in this patch and the previous one will make tune
> > other's rt_runtime/rt_period trouble, I guess.
> 
> Yeah, as in making it impossible to allocate even 1 usec :)  We need
> zero bandwidth though, so tell  __sched_setscheduler() that autogroups
> having zero allocated is perfectly fine.
> 
> 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>
> 
> ---
>  kernel/sched.c           |    3 ++-
>  kernel/sched_autogroup.c |   27 +++++++++++++++++++++++++++
>  kernel/sched_autogroup.h |    4 ++++
>  3 files changed, 33 insertions(+), 1 deletion(-)
> 

Works fine here.

Thanks,
Bharata.
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