linux-kernel - Re: [PATCH 2/2] memcg: Allow hard guarantee mode for low limit reclaim

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Message-ID: <20140611153410.GB17777@htj.dyndns.org>
Date:	Wed, 11 Jun 2014 11:34:10 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Greg Thelen <gthelen@...gle.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Michel Lespinasse <walken@...gle.com>,
	Roman Gushchin <klamm@...dex-team.ru>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 2/2] memcg: Allow hard guarantee mode for low limit
 reclaim

On Wed, Jun 11, 2014 at 04:11:17PM +0200, Michal Hocko wrote:
> > I still think it'd be less useful than "high", but as there seem to be
> > use cases which can be served with that and especially as a part of a
> > consistent control scheme, I have no objection.
> > 
> > "low" definitely requires a notification mechanism tho.
> 
> Would vmpressure notification be sufficient? That one is in place for
> any memcg which is reclaimed.

Yeah, as long as it can reliably notify userland that the soft
guarantee has been breached, it'd be great as it means we'd have a
single mechanism to monitor both "low" and "high" while "min" and
"max" are oom based, which BTW needs more work but that's a separate
piece of work.

Thanks.

-- 
tejun
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