linux-kernel - Re: [PATCH 3/3] mm, mem-hotplug: update pcp->stat

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Message-Id: <20110412183010.B52A.A69D9226@jp.fujitsu.com>
Date:	Tue, 12 Apr 2011 18:29:23 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com, linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>, Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH 3/3] mm, mem-hotplug: update pcp->stat_threshold when memory hotplug occur

Hi

> Hi, KOSAKI
> 
> On Mon, Apr 11, 2011 at 5:01 PM, KOSAKI Motohiro
> <kosaki.motohiro@...fujitsu.com> wrote:
> > Currently, cpu hotplug updates pcp->stat_threashold, but memory
> > hotplug doesn't. there is no reason.
> >
> > Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> > Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> > Acked-by: Mel Gorman <mel@....ul.ie>
> > Acked-by: Christoph Lameter <cl@...ux.com>
> 
> I can think it makes sense so I don't oppose the patch merging.
> But as you know I am very keen on the description.
> 
> What is the problem if hotplug doesn't do it?
> I means the patch solves what's problem?
> 
> Please write down fully for better description.
> Thanks.

No real world issue. I found the fault by code review.
No good stat_threshold might makes performance hurt.




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