linux-kernel - Re: [PATCH 3/3] memcg: move page-freeing code outside of lock

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Date:	Tue, 22 Mar 2011 08:39:35 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Namhyung Kim <namhyung@...il.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] memcg: move page-freeing code outside of lock

On Tue, Mar 22, 2011 at 8:34 AM, Namhyung Kim <namhyung@...il.com> wrote:
>
> 2011-03-22 (화), 08:59 +0900, KAMEZAWA Hiroyuki:
> > On Fri, 18 Mar 2011 21:54:15 +0900
> > Namhyung Kim <namhyung@...il.com> wrote:
> >
> > > Signed-off-by: Namhyung Kim <namhyung@...il.com>
> > > Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> >
> > What is the benefit of this patch ?
> >
> > -Kame
> >
>
> Oh, I just thought generally it'd better call such a (potentially)
> costly function outside of locks and it could reduce few of theoretical
> contentions between swapons and/or offs. If it doesn't help any
> realistic cases I don't mind discarding it.

swapoff is a rare path, I would not worry about it too much at all.

Balbir
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