linux-kernel - Re: [PATCH 0/3] cgroup id and scanning without cgroup

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Message-Id: <20081201165207.0db76b1f.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 1 Dec 2008 16:52:07 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"menage@...gle.com" <menage@...gle.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/3] cgroup id and scanning without cgroup_lock

On Mon, 1 Dec 2008 11:54:29 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2008-12-01 14:59:07]:
> 
> > This is a series of patches againse mmotm-Nov29
> > (passed easy test)
> > 
> > Now, memcg supports hierarhcy. But walking cgroup tree in intellegent way
> > with lock/unlock cgroup_mutex seems to have troubles rather than expected.
> > And, I want to reduce the memory usage of swap_cgroup, which uses array of
> > pointers.
> > 
> > This patch series provides
> > 	- cgroup_id per cgroup object.
> > 	- lookup struct cgroup by cgroup_id
> > 	- scan all cgroup under tree by cgroup_id. without mutex.
> > 	- css_tryget() function.
> > 	- fixes semantics of notify_on_release. (I think this is valid fix.)
> > 
> > Many changes since v1. (But I wonder some more work may be neeeded.)
> > 
> > BTW, I know there are some amount of patches against memcg are posted recently.
> > If necessary, I'll prepare Weekly-update queue again (Wednesday) and
> > picks all patches to linux-mm in my queue.
> >
> 
> Thanks for the offer, I've just come back from foss.in. I need to look
> athe locking issue with cgroup_lock() reported and also review/test
> the other patches. 
> 
Hmm, after reading mailing list again, it seems it's better to do some serialization.
I'll pick up some and post a queue tomorrow.

Thanks,
-Kame

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