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:	Mon, 13 May 2013 16:06:25 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alex Shi <alex.shi@...el.com>
Cc:	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,
	wangyun@...ux.vnet.ibm.com
Subject: Re: [patch v6 6/8] sched: compute runnable load avg in cpu_load and
 cpu_avg_load_per_task

On Fri, May 10, 2013 at 11:17:27PM +0800, Alex Shi wrote:
> They are the base values in load balance, update them with rq runnable
> load average, then the load balance will consider runnable load avg
> naturally.
> 
> We also try to include the blocked_load_avg as cpu load in balancing,
> but that cause kbuild/aim7/oltp benchmark performance drop.
> 
> Signed-off-by: Alex Shi <alex.shi@...el.com>
> ---
>  kernel/sched/core.c |   16 ++++++++++++++--
>  kernel/sched/fair.c |    5 +++--
>  2 files changed, 17 insertions(+), 4 deletions(-)
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index f1f9641..8ab37c3 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -2528,9 +2528,14 @@ 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;
>  	unsigned long pending_updates;
>  
> +#ifdef CONFIG_SMP
> +	load = this_rq->cfs.runnable_load_avg;
> +#else
> +	load = this_rq->load.weight;
> +#endif
>  	/*
>  	 * bail if there's load or we're actually up-to-date.
>  	 */
> @@ -2574,11 +2579,18 @@ void update_cpu_load_nohz(void)
>   */
>  static void update_cpu_load_active(struct rq *this_rq)
>  {
> +	unsigned long load;
> +
> +#ifdef CONFIG_SMP
> +	load = this_rq->cfs.runnable_load_avg;
> +#else
> +	load = this_rq->load.weight;
> +#endif
>  	/*
>  	 * See the mess around update_idle_cpu_load() / update_cpu_load_nohz().

This just smells like you want a helper function... :-)

Also it doesn't apply anymore due to Paul Gortemaker moving some of this
stuff about.
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