linux-kernel - Re: [patch v6 6/8] sched: compute runnable load avg in cpu_load and cpu_avg_load_per

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Date:	Thu, 16 May 2013 13:49:15 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Alex Shi <alex.shi@...el.com>
CC:	Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com,
	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 v6 6/8] sched: compute runnable load avg in cpu_load and
 cpu_avg_load_per_task

Hi, Alex

On 05/14/2013 03:27 PM, Alex Shi wrote:
[snip]
>  }
> diff --git a/kernel/sched/proc.c b/kernel/sched/proc.c

This patch seems to be based on 3.10-rc1, while below one

[patch v6 3/8] sched: set initial value of runnable avg for new forked task

is conflict with 3.10-rc1... I think it may need some rebase?

Regards,
Michael Wang


> index bb3a6a0..ce5cd48 100644
> --- a/kernel/sched/proc.c
> +++ b/kernel/sched/proc.c
> @@ -501,6 +501,18 @@ static void __update_cpu_load(struct rq *this_rq, unsigned long this_load,
>  	sched_avg_update(this_rq);
>  }
> 
> +#ifdef CONFIG_SMP
> +unsigned long get_rq_runnable_load(struct rq *rq)
> +{
> +	return rq->cfs.runnable_load_avg;
> +}
> +#else
> +unsigned long get_rq_runnable_load(struct rq *rq)
> +{
> +	return rq->load.weight;
> +}
> +#endif
> +
>  #ifdef CONFIG_NO_HZ_COMMON
>  /*
>   * There is no sane way to deal with nohz on smp when using jiffies because the
> @@ -522,7 +534,7 @@ static void __update_cpu_load(struct rq *this_rq, unsigned long this_load,
>  void update_idle_cpu_load(struct rq *this_rq)
>  {
>  	unsigned long curr_jiffies = ACCESS_ONCE(jiffies);
> -	unsigned long load = this_rq->load.weight;
> +	unsigned long load = get_rq_runnable_load(this_rq);
>  	unsigned long pending_updates;
> 
>  	/*
> @@ -568,11 +580,12 @@ void update_cpu_load_nohz(void)
>   */
>  void update_cpu_load_active(struct rq *this_rq)
>  {
> +	unsigned long load = get_rq_runnable_load(this_rq);
>  	/*
>  	 * See the mess around update_idle_cpu_load() / update_cpu_load_nohz().
>  	 */
>  	this_rq->last_load_update_tick = jiffies;
> -	__update_cpu_load(this_rq, this_rq->load.weight, 1);
> +	__update_cpu_load(this_rq, load, 1);
> 
>  	calc_load_account_active(this_rq);
>  }
> 

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