linux-kernel - Re: [PATCH v3 3/3] sched: clean-up struct sd_lb

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Date:	Thu, 15 Aug 2013 20:05:21 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Mike Galbraith <efault@....de>, Paul Turner <pjt@...gle.com>,
	Alex Shi <alex.shi@...el.com>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Namhyung Kim <namhyung@...nel.org>,
	Joonsoo Kim <js1304@...il.com>
Subject: Re: [PATCH v3 3/3] sched: clean-up struct sd_lb_stat

On Tue, Aug 06, 2013 at 05:36:43PM +0900, Joonsoo Kim wrote:
> -	if (sds->group_imb) {
> -		sds->busiest_load_per_task =
> -			min(sds->busiest_load_per_task, sds->avg_load);

> +	if (busiest->group_imb) {
> +		busiest->load_per_task =
> +			min(busiest->load_per_task, sds->sd_avg_load);
>  	}

> -	if (sds->max_load < sds->avg_load) {
> +	if (busiest->avg_load < this->avg_load) {

Tsk, inconsistency there.

> -	max_pull = min(sds->max_load - sds->avg_load, load_above_capacity);
> +	max_pull = min(busiest->avg_load - sds->sd_avg_load,
> +			load_above_capacity);

you just made it possible for the above subtraction to become negative.

Also not entirely sure why you renamed sds->avg_load; renaming it back.
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