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

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Message-Id: <20100825093747.24085b28.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 25 Aug 2010 09:37:47 +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 17:34:38 -0700
Paul Menage <menage@...gle.com> wrote:

> On Tue, Aug 24, 2010 at 5:20 PM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> >
> > Hmm, sure. I'll change the ->create() interface.  O.K. ?
> >
> 
> Hmm. An alternative (possibly cleaner) would be:
> 
> 1) add a css_size field in cgroup_subsys that contains the size of the
> per-subsystem structure
> 2) change cgroups to allocate and populate the css *before* calling
> create(), since it now knows the actual size
> 3) simplify all the subsystem create() methods since they no longer
> have to worry about allocation or out-of-memory handling
> 4) also add a top_css field in cgroups that allows cpusets to use the
> statically-allocated top_cpuset since it's initialized prior to memory
> allocation being reliable
> 
> This avoids us having to pass in any new parameters to the create()
> method in future since they can be populated in the CSS.
> 

Ou...I'm sorry but I would like to use attach_id() for this time.
Forgive me, above seems a big change.
I'd like to write a series of patch to do above, later.
At least, to do a trial.

Thanks,
-Kame

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