linux-kernel - Re: [PATCH v2] cgroups: make cftype.unregister

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Message-Id: <20100510150815.3d2f7647.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 10 May 2010 15:08:15 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	linux-mm@...ck.org, containers@...ts.linux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Phil Carmody <ext-phil.2.carmody@...ia.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] cgroups: make cftype.unregister_event()
 void-returning

On Sun,  9 May 2010 03:10:22 +0300
"Kirill A. Shutemov" <kirill@...temov.name> wrote:

> Since we unable to handle error returned by cftype.unregister_event()
> properly, let's make the callback void-returning.
> 
> mem_cgroup_unregister_event() has been rewritten to be "never fail"
> function. On mem_cgroup_usage_register_event() we save old buffer
> for thresholds array and reuse it in mem_cgroup_usage_unregister_event()
> to avoid allocation.
> 
> Signed-off-by: Kirill A. Shutemov <kirill@...temov.name>

Hmm, just reusing buffer isn't enough ?
as
	tmp = memory->thresholds;
	reduce entries on tmp
And what happens when

	register
	register
	register	
	unregister  (use preallocated buffer)
	unregister  ????
	unregister

Thanks,
-Kame

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