linux-kernel - Re: [PATCH v4 1/4] cgroup: implement eventfd-based generic API for notifications

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Message-Id: <20091228113154.e2c2566e.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 28 Dec 2009 11:31:54 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	containers@...ts.linux-foundation.org, linux-mm@...ck.org,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Dan Malek <dan@...eddedalley.com>,
	Vladislav Buzov <vbuzov@...eddedalley.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Alexander Shishkin <virtuoso@...nd.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/4] cgroup: implement eventfd-based generic API for
 notifications

On Sun, 27 Dec 2009 04:08:59 +0200
"Kirill A. Shutemov" <kirill@...temov.name> wrote:

> This patch introduces write-only file "cgroup.event_control" in every
> cgroup.
> 
> To register new notification handler you need:
> - create an eventfd;
> - open a control file to be monitored. Callbacks register_event() and
>   unregister_event() must be defined for the control file;
> - write "<event_fd> <control_fd> <args>" to cgroup.event_control.
>   Interpretation of args is defined by control file implementation;
> 
> eventfd will be woken up by control file implementation or when the
> cgroup is removed.
> 
> To unregister notification handler just close eventfd.
> 
> If you need notification functionality for a control file you have to
> implement callbacks register_event() and unregister_event() in the
> struct cftype.
> 
> Signed-off-by: Kirill A. Shutemov <kirill@...temov.name>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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