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

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Message-ID: <20120315194545.GG32137@google.com>
Date:	Thu, 15 Mar 2012 12:45:45 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Lennart Poettering <mzxreary@...inter.de>
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

Hello,

On Thu, Mar 15, 2012 at 08:36:35PM +0100, Lennart Poettering wrote:
> > * 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?

MODIFY probably is the only thing which makes sense and I don't think
we would be emitting events for every task addition/removals.  That
better fits MODIFY events on the tasks file anyway.

Thanks.

-- 
tejun
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