linux-kernel - Re: [PATCH] cgroup: deprecate remount option changes mount option

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Message-ID: <20120315193635.GD32661@tango.0pointer.de>
Date:	Thu, 15 Mar 2012 20:36:35 +0100
From:	Lennart Poettering <mzxreary@...inter.de>
To:	Tejun Heo <tj@...nel.org>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] cgroup: deprecate remount option changes mount option

On Thu, 15.03.12 09:56, Tejun Heo (tj@...nel.org) wrote:

> This patch marks the following features for deprecation.
> 
> * Rebinding subsys by remount: Never reached useful state - only works
>   on empty hierarchies.
> 
> * release_agent update by remount: release_agent itself will be
>   replaced with conventional fsnotify notification.

Just wondering, what kind of event do you plan to emit if a cgroup runs
empty? To userspace, with fanotify, will this be FAN_MODIFY? I'd very
much prefer if we only get events really when a group runs empty, and
not each time a PID is added/removed from a cgroup, which FAN_NOTIFY
might suggest?

Lennart

-- 
Lennart Poettering - Red Hat, Inc.
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