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

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Message-ID: <4C738B34.6070602@cn.fujitsu.com>
Date:	Tue, 24 Aug 2010 17:04:52 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.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,
	"menage@...gle.com" <menage@...gle.com>
Subject: Re: [PATCH 1/5] cgroup: ID notification call back

KAMEZAWA Hiroyuki 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.
> 
> Changelog: 20100820
>  - new approarch.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Acked-by: Li Zefan <lizf@...fujitsu.com>

...
>  
> Index: mmotm-0811/include/linux/cgroup.h
> ===================================================================
> --- mmotm-0811.orig/include/linux/cgroup.h
> +++ mmotm-0811/include/linux/cgroup.h
> @@ -475,6 +475,7 @@ struct cgroup_subsys {
>  			struct cgroup *cgrp);
>  	void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cgrp);
>  	void (*bind)(struct cgroup_subsys *ss, struct cgroup *root);
> +	void (*id_attached)(struct cgroup_subsys *ss, struct cgroup *cgrp);

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..

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