linux-kernel - Re: [PATCH 1/2] memcg: mem_cgroup->prev

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Message-Id: <20081202161837.1D04.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Tue,  2 Dec 2008 16:19:20 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] memcg: mem_cgroup->prev_priority protected by lock.

> On Tue,  2 Dec 2008 16:11:07 +0900 (JST)
> KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:
> 
> > 
> > Currently, mem_cgroup doesn't have own lock and almost its member doesn't need.
> >  (e.g. info is protected by zone lock, stat is per cpu variable)
> > 
> > However, there is one explict exception. mem_cgroup->prev_priorit need lock,
> > but doesn't protect.
> > Luckly, this is NOT bug because prev_priority isn't used for current reclaim code.
> > 
> > However, we plan to use prev_priority future again.
> > Therefore, fixing is better.
> > 
> > 
> > In addision, we plan to reuse this lock for another member.
> > Then "misc_lock" name is better than "prev_priority_lock".
> > 
> please use better name...reclaim_param_lock or some ?

good idea :)

Will fix.



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