linux-kernel - Re: [PATCH 1/5] cgroup: do ID allocation under css allocator.

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Message-Id: <20100826091346.88eb3ecc.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 26 Aug 2010 09:13:46 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	linux-mm@...ck.org,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	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>,
	"menage@...gle.com" <menage@...gle.com>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>
Subject: Re: [PATCH 1/5] cgroup: do ID allocation under css allocator.

On Wed, 25 Aug 2010 19:45:00 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2010-08-25 17:06:40]:
> 
> > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> > 
> > Now, css'id is allocated after ->create() is called. But to make use of ID
> > in ->create(), it should be available before ->create().
> > 
> > In another thinking, considering the ID is tightly coupled with "css",
> > it should be allocated when "css" is allocated.
> > This patch moves alloc_css_id() to css allocation routine. Now, only 2 subsys,
> > memory and blkio are useing ID. (To support complicated hierarchy walk.)
>                        ^^^^ typo
> > 
> > ID will be used in mem cgroup's ->create(), later.
> > 
> > Note:
> > If someone changes rules of css allocation, ID allocation should be moved too.
> > 
> 
> What rules? could you please elaborate?
> 
See Paul Menage's mail. He said "allocating css object under kernel/cgroup.c
will make kernel/cgroup.c cleaner." But it seems too big for my purpose.

> Seems cleaner, may be we need to update cgroups.txt?

Hmm. will look into.

Thanks,
-Kame

> 
> -- 
> 	Three Cheers,
> 	Balbir
> 
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