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

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Message-Id: <20100825092010.cfe91b1a.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 25 Aug 2010 09:20:10 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>
Cc:	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,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>
Subject: Re: [PATCH 1/5] cgroup: ID notification call back

On Tue, 24 Aug 2010 17:09:25 -0700
Paul Menage <menage@...gle.com> wrote:

> On Fri, Aug 20, 2010 at 2:58 AM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> > CC'ed to Paul Menage and Li Zefan.
> > ==
> > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> >
> > When cgroup subsystem use ID (ss->use_id==1), each css's ID is assigned
> > after successful call of ->create(). css_ID is tightly coupled with
> > css struct itself but it is allocated by ->create() call, IOW,
> > per-subsystem special allocations.
> >
> > To know css_id before creation, this patch adds id_attached() callback.
> > after css_ID allocation. This will be used by memory cgroup's quick lookup
> > routine.
> >
> > Maybe you can think of other implementations as
> >        - pass ID to ->create()
> >        or
> >        - add post_create()
> >        etc...
> > But when considering dirtiness of codes, this straightforward patch seems
> > good to me. If someone wants post_create(), this patch can be replaced.
> 
> I think I'd prefer the approach where any necessary css_ids are
> allocated prior to calling any create methods (which gives the
> additional advantage of removing the need to roll back partial
> creation of a cgroup in the event of alloc_css_id() failing) and then
> passed in to the create() method. The main cgroups framework would
> still be responsible for actually filling the css->id field with the
> allocated id.
> 

Hmm, sure. I'll change the ->create() interface.  O.K. ?

Thanks,
-Kame

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