linux-kernel - Re: [PATCH v2 05/12] cpuset: use effective cpumask to build sched domains

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Message-ID: <20131015152538.GL3141@htj.dyndns.org>
Date:	Tue, 15 Oct 2013 11:25:38 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH v2 05/12] cpuset: use effective cpumask to build sched
 domains

On Fri, Oct 11, 2013 at 05:50:38PM +0800, Li Zefan wrote:
> @@ -930,10 +931,21 @@ static void update_cpumasks_hier(struct cpuset *cs, struct cpuset *trialcs,
>  
>  		update_tasks_cpumask(cp, heap);
>  
> +		/*
> +		 * If the effective cpumask of any non-empty cpuset is
> +		 * changed, we need to rebuild sched domains.
> +		 */
> +		if (!cpumask_empty(cp->cpus_allowed) &&
> +		    is_sched_load_balance(cp))
> +			need_rebuild_sched_domains = true;
> +

Can you please explain *why* this change is being made in the patch
description?  The patch description doesn't give me anything and the
comment explain "what" but not why it's moved from update_cpumask()
into this function with an extra condition.

Thanks.

-- 
tejun
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