linux-kernel - Re: [RFD] Merge task counter into memcg

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Date:	Tue, 17 Apr 2012 08:23:50 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Alexander Nikiforov <a.nikiforov@...sung.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Glauber Costa <glommer@...allels.com>,
	Daniel Walsh <dwalsh@...hat.com>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	Li Zefan <lizf@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>,
	Containers <containers@...ts.linux-foundation.org>
Subject: Re: [RFD] Merge task counter into memcg

Hello,

On Tue, Apr 17, 2012 at 10:45:05AM +0400, Alexander Nikiforov wrote:
> between them. Now we have only 1 way to get notification about tasks
> file - inotify(), but this approach works only if you work from
> userspace with file (e.g. create struct file, for example with echo
> $$ /sys/abc/tasks), but when something happens from kernel side
> (do_fork()/do_exit) we cannot get any event about group of the
> process (we can scan tasks file and count number of PID, or work
> with
> waitpid(), but IMHO this is ugly solutions)

Wouldn't simply generating FS_MODIFY event on the tasks file do the
trick?

Thanks.

-- 
tejun
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