linux-kernel - Re: [PATCH 1/5] cgroup: ID notification call back

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Message-ID: <AANLkTi=HwPeWafzTBh66g37XxZouKicsemmnTE-Cvz=Y@mail.gmail.com>
Date:	Tue, 24 Aug 2010 17:11:22 -0700
From:	Paul Menage <menage@...gle.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	gthelen@...gle.com, m-ikeda@...jp.nec.com,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kamezawa.hiroyuki@...il.com
Subject: Re: [PATCH 1/5] cgroup: ID notification call back

On Tue, Aug 24, 2010 at 2:04 AM, Li Zefan <lizf@...fujitsu.com> wrote:
>
> Maybe pass the id number to id_attached() is better.
>
> And actually the @ss argument is not necessary, because the memcg's
> id_attached() handler of course knows it's dealing with the memory
> cgroup subsystem.
>
> So I suspect we can just remove all the @ss from all the callbacks..

Yes, I don't think any subsystem uses these. They dated originally
from when, as part of the initial cgroups framwork, I included a
library that could wrap a mostly-unmodified CKRM resource controller
into a cgroups subsystem, at which point the callback code didn't
necessarily know which subsystem it was being called for. But that's
obsolete now.

Paul
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