linux-kernel - Re: [git] CFS-devel, latest code

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Message-ID: <20071003041510.GJ5724@linux.vnet.ibm.com>
Date:	Wed, 3 Oct 2007 09:45:10 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Dmitry Adamushko <dmitry.adamushko@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: [git] CFS-devel, latest code

On Tue, Oct 02, 2007 at 09:59:04PM +0200, Dmitry Adamushko wrote:
> The following patch (sched: disable sleeper_fairness on SCHED_BATCH)
> seems to break GROUP_SCHED. Although, it may be
> 'oops'-less due to the possibility of 'p' being always a valid
> address.

Thanks for catching it!  Patch below looks good to me. 

Acked-by : Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>

> Signed-off-by: Dmitry Adamushko <dmitry.adamushko@...il.com>
> 
> ---
> diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
> index 8727d17..a379456 100644
> --- a/kernel/sched_fair.c
> +++ b/kernel/sched_fair.c
> @@ -473,9 +473,8 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
>  		vruntime += sched_vslice_add(cfs_rq, se);
> 
>  	if (!initial) {
> -		struct task_struct *p = container_of(se, struct task_struct, se);
> -
> -		if (sched_feat(NEW_FAIR_SLEEPERS) && p->policy != SCHED_BATCH)
> +		if (sched_feat(NEW_FAIR_SLEEPERS) && entity_is_task(se) &&
> +				task_of(se)->policy != SCHED_BATCH)
>  			vruntime -= sysctl_sched_latency;
> 
>  		vruntime = max_t(s64, vruntime, se->vruntime);
> 
> ---
> 

-- 
Regards,
vatsa
-
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