linux-kernel - Re: [PATCH 2/2] memcg: remove charge variable in unmap_and

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Message-Id: <20110112093820.405fc115.nishimura@mxp.nes.nec.co.jp>
Date:	Wed, 12 Jan 2011 09:38:20 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH 2/2] memcg: remove charge variable in unmap_and_move

On Tue, 11 Jan 2011 17:51:12 +0900
Minchan Kim <minchan.kim@...il.com> wrote:

> memcg charge/uncharge could be handled by mem_cgroup_[prepare/end]
> migration itself so charge local variable in unmap_and_move lost the role
> since we introduced 01b1ae63c2.
> 
> In addition, the variable name is not good like below.
> 
> int unmap_and_move()
> {
> 	charge = mem_cgroup_prepare_migration(xxx);
> 	..
> 		BUG_ON(charge); <-- BUG if it is charged?
> 		..
> uncharge:
> 		if (!charge)    <-- why do we have to uncharge !charge?
> 			mem_group_end_migration(xxx);
> 	..
> }
> 
> So let's remove unnecessary and confusing variable.
> 
> Suggested-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
> Cc: Balbir Singh <balbir@...ux.vnet.ibm.com>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>

Acked-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
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