linux-kernel - [PATCH RFC v0 1/3] cgroup: implement eventfd-based generic API for notifications

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Message-Id: <bc4dc055a7307c8667da85a4d4d9d5d189af27d5.1259248846.git.kirill@shutemov.name>
Date:	Thu, 26 Nov 2009 18:27:36 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	containers@...ts.linux-foundation.org, linux-mm@...ck.org
Cc:	Paul Menage <menage@...gle.com>, Li Zefan <lizf@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill@...temov.name>
Subject: [PATCH RFC v0 1/3] cgroup: implement eventfd-based generic API for notifications

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.

Signed-off-by: Kirill A. Shutemov <kirill@...temov.name>

-- 
1.6.5.3

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