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

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Date:	Thu, 19 Apr 2012 07:34:15 +0400
From:	Alexander Nikiforov <a.nikiforov@...sung.com>
To:	Tejun Heo <tj@...nel.org>
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>,
	d.solodkiy@...sung.com
Subject: Re: [RFD] Merge task counter into memcg

On 04/17/2012 07:23 PM, Tejun Heo wrote:
> 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.
>
Maybe it will, but in my mind it should be with event. I thought about 
inotify before my RFD mail. Here we have file update, so FS_MODIFY very 
natural.
But on the other hand - we have event in memcg, so conventional approach 
is event.

If this functionality is acceptable in cgroup and FS_MODIFY better, 
we'll make new patch with this approach.

-- 
Best regards,
      Alex Nikiforov,
      Mobile SW, Advanced Software Group,
      Moscow R&D center, Samsung Electronics

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