Date: Wed, 11 Jun 2014 11:34:10 -0400
From: Tejun Heo <tj@kernel.org>
To: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>, Greg Thelen <gthelen@google.com>,
        Hugh Dickins <hughd@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Michel Lespinasse <walken@google.com>,
        Roman Gushchin <klamm@yandex-team.ru>,
        LKML <linux-kernel@vger.kernel.org>, linux-mm@kvack.org
Subject: Re: [PATCH 2/2] memcg: Allow hard guarantee mode for low limit
 reclaim
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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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