linux-kernel - Re: [PATCH v5 7/7] sched: consider runnable load average in effective

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Date:	Mon, 06 May 2013 15:49:48 +0800
From:	Michael Wang <wangyun@...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, preeti@...ux.vnet.ibm.com,
	viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
	mgorman@...e.de, riel@...hat.com
Subject: Re: [PATCH v5 7/7] sched: consider runnable load average in effective_load

On 05/06/2013 01:39 PM, Alex Shi wrote:
[snip]

Rough test done:

> 
> 1, change back the tg_weight in calc_tg_weight() to use tg_load_contrib not direct load.

This way stop the regression of patch 7.

> 
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 6f4f14b..c770f8d 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -1037,8 +1037,8 @@ static inline long calc_tg_weight(struct task_group *tg, struct cfs_rq *cfs_rq)
>  	 * update_cfs_rq_load_contribution().
>  	 */
>  	tg_weight = atomic64_read(&tg->load_avg);
> -	tg_weight -= cfs_rq->tg_load_contrib;
> -	tg_weight += cfs_rq->load.weight;
> +	//tg_weight -= cfs_rq->tg_load_contrib;
> +	//tg_weight += cfs_rq->load.weight;
> 
>  	return tg_weight;
>  }
> 
> 2, another try is follow the current calc_tg_weight, so remove the follow change.

This way show even better results than only patch 1~6.

But the way Preeti suggested doesn't works...

May be we should record some explanation about this change here, do we?

Regards,
Michael Wang

> 
>>>> @@ -3045,7 +3045,7 @@ static long effective_load(struct task_group *tg, int cpu, long wl, long wg)
>>>>  		/*
>>>>  		 * w = rw_i + @wl
>>>>  		 */
>>>> -		w = se->my_q->load.weight + wl;
>>>> +		w = se->my_q->tg_load_contrib + wl;
> 
> Would you like to try them?
> 
> 

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