linux-kernel - Re: [PATCH 2/4] sched: compute runnable load avg in cpu_load and cpu_avg_load_per

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Date:	Thu, 24 Jan 2013 11:08:23 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Alex Shi <alex.shi@...el.com>
Cc:	mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, bp@...en8.de,
	pjt@...gle.com, namhyung@...nel.org, efault@....de,
	vincent.guittot@...aro.org, gregkh@...uxfoundation.org,
	preeti@...ux.vnet.ibm.com, viresh.kumar@...aro.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] sched: compute runnable load avg in cpu_load and
 cpu_avg_load_per_task


* Alex Shi <alex.shi@...el.com> wrote:

> @@ -2539,7 +2539,11 @@ 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);
> +#if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
> +	unsigned long load = (unsigned long)this_rq->cfs.runnable_load_avg;
> +#else
>  	unsigned long load = this_rq->load.weight;
> +#endif

I'd not make it conditional - just calculate runnable_load_avg 
all the time (even if group scheduling is disabled) and use it 
consistently. The last thing we want is to bifurcate scheduler 
balancer behavior even further.

Thanks,

	Ingo
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