linux-kernel - Re: [PATCH 1/3] percpu: stop the loop when a cpu belongs to a new group

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Message-ID: <20131027123008.GJ14934@mtj.dyndns.org>
Date:	Sun, 27 Oct 2013 08:30:08 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Wei Yang <weiyang@...ux.vnet.ibm.com>
Cc:	cl@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] percpu: stop the loop when a cpu belongs to a new
 group

On Mon, Oct 21, 2013 at 04:58:11PM +0800, Wei Yang wrote:
> When a cpu belongs to a new group, there is no cpu has the same group id. This
> means it can be assigned a new group id without checking with every others.
> 
> This patch does this optimiztion.

Does this actually matter?  If so, it'd probably make a lot more sense
to start inner loop at @cpu + 1 so that it becomes O(N).

Thanks.

-- 
tejun
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