linux-kernel - Re: [PATCH v5 2/7] sched: remove SMP cover for runnable variables in cfs

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Message-ID: <51872D7F.30909@linux.vnet.ibm.com>
Date:	Mon, 06 May 2013 09:41:43 +0530
From:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
To:	Alex Shi <alex.shi@...el.com>
CC:	mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, bp@...en8.de, pjt@...gle.com,
	namhyung@...nel.org, efault@....de, morten.rasmussen@....com,
	vincent.guittot@...aro.org, viresh.kumar@...aro.org,
	linux-kernel@...r.kernel.org, mgorman@...e.de, riel@...hat.com,
	wangyun@...ux.vnet.ibm.com
Subject: Re: [PATCH v5 2/7] sched: remove SMP cover for runnable variables
 in cfs_rq

Hi Alex,

You might want to do the below for struct sched_entity also?
AFAIK,struct sched_entity has struct sched_avg under CONFIG_SMP.

Regards
Preeti U Murthy

On 05/06/2013 07:15 AM, Alex Shi wrote:
> The following variables were covered under CONFIG_SMP in struct cfs_rq.
> but similar runnable variables work for UP in struct rq and task_group.
> like rq->avg, task_group->load_avg.
> So move them out, they also can work with UP.
> 
>          u64 runnable_load_avg, blocked_load_avg;
>          atomic64_t decay_counter, removed_load;
>          u64 last_decay;
> 
>          u32 tg_runnable_contrib;
>          u64 tg_load_contrib;
> 
> Signed-off-by: Alex Shi <alex.shi@...el.com>
> ---
>  kernel/sched/sched.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index 7f36024f..1a02b90 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -226,7 +226,6 @@ struct cfs_rq {
>  	unsigned int nr_spread_over;
>  #endif
> 
> -#ifdef CONFIG_SMP
>  	/*
>  	 * CFS Load tracking
>  	 * Under CFS, load is tracked on a per-entity basis and aggregated up.
> @@ -242,6 +241,7 @@ struct cfs_rq {
>  	u64 tg_load_contrib;
>  #endif /* CONFIG_FAIR_GROUP_SCHED */
> 
> +#ifdef CONFIG_SMP
>  	/*
>  	 *   h_load = weight * f(tg)
>  	 *
> 

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