linux-kernel - Re: [PATCH v2] memcg: Add memory.pressure

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Message-ID: <CAOS58YOPjcH_pFFhPLJEAdaLkm5FoOy9mG2i-PkWAcb7O6V_Kw@mail.gmail.com>
Date:	Tue, 19 Feb 2013 16:21:28 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Anton Vorontsov <anton.vorontsov@...aro.org>,
	cgroups@...r.kernel.org, David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>,
	Mel Gorman <mgorman@...e.de>,
	Glauber Costa <glommer@...allels.com>,
	Michal Hocko <mhocko@...e.cz>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Luiz Capitulino <lcapitulino@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Thelen <gthelen@...gle.com>,
	Leonid Moiseichuk <leonid.moiseichuk@...ia.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	John Stultz <john.stultz@...aro.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	patches@...aro.org, kernel-team@...roid.com
Subject: Re: [PATCH v2] memcg: Add memory.pressure_level events

Hello,

On Tue, Feb 19, 2013 at 4:17 PM, Minchan Kim <minchan@...nel.org> wrote:
> Should we really enable memcg for just pressure notificaion in embedded side?
> I didn't check the size(cgroup + memcg) and performance penalty but I don't want
> to add unnecessary overhead if it is possible.
> Do you have a plan to support it via global knob(ie, /proc/mempressure), NOT memcg?

That should be handled by mempressure at the root cgroup. If that adds
significant amount of overhead code or memory-wise, we just need to
fix root cgroup handling in memcg. No reason to further complicate the
interface which already is pretty complex.

Thanks.

-- 
tejun
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