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

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Message-ID: <AANLkTi=x-nO-Z7hG9b5t2FvuznHXaTSLPdS05wkXYMKA@mail.gmail.com>
Date:	Thu, 13 Jan 2011 13:59:10 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Mike Galbraith <efault@....de>
Cc:	bharata@...ux.vnet.ibm.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 11:54 AM, Mike Galbraith <efault@....de> 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>

This looks more clear ;)

And a little comment below

>
> ---
>  kernel/sched.c           |    3 ++-
>  kernel/sched_autogroup.c |   27 +++++++++++++++++++++++++++
>  kernel/sched_autogroup.h |    4 ++++
>  3 files changed, 33 insertions(+), 1 deletion(-)
> @@ -106,6 +128,11 @@ task_wants_autogroup(struct task_struct
>        return true;
>  }
>
> +static inline bool task_group_is_autogroup(struct task_group *tg)
> +{
> +       return tg != &root_task_group && tg->autogroup;

Isn't just checking tg->autogroup sufficient?

if tg == &root_task_group

> --- linux-2.6.orig/kernel/sched.c
> +++ linux-2.6/kernel/sched.c
> @@ -4874,7 +4874,8 @@ recheck:
>                 * assigned.
>                 */
>                if (rt_bandwidth_enabled() && rt_policy(policy) &&
> -                               task_group(p)->rt_bandwidth.rt_runtime == 0) {
> +                               task_group(p)->rt_bandwidth.rt_runtime == 0 &&

this check will fail.

Thanks,
Yong

-- 
Only stand for myself
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