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Date: Wed, 4 Jun 2014 12:18:59 -0700 (PDT)
From: Hugh Dickins <hughd@google.com>
Subject: Re: [PATCH v2 0/4] memcg: Low-limit reclaim
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References: <1398688005-26207-1-git-send-email-mhocko@suse.cz> <20140528121023.GA10735@dhcp22.suse.cz> <20140528134905.GF2878@cmpxchg.org> <20140528142144.GL9895@dhcp22.suse.cz> <20140528152854.GG2878@cmpxchg.org> <20140528155414.GN9895@dhcp22.suse.cz>
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To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>, Andrew Morton <akpm@linux-foundation.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Greg Thelen <gthelen@google.com>, Michel Lespinasse <walken@google.com>, Tejun Heo <tj@kernel.org>, Hugh Dickins <hughd@google.com>, Roman Gushchin <klamm@yandex-team.ru>, LKML <linux-kernel@vger.kernel.org>, linux-mm@kvack.org, Rik van Riel <riel@redhat.com>

On Wed, 4 Jun 2014, Johannes Weiner wrote:
> On Wed, Jun 04, 2014 at 04:46:58PM +0200, Michal Hocko wrote:
> > 
> > In the other email I have suggested to add a knob with the configurable
> > default. Would you be OK with that?
> 
> No, I want to agree on whether we need that fallback code or not.  I'm
> not interested in merging code that you can't convince anybody else is
> needed.

I for one would welcome such a knob as Michal is proposing.

I thought it was long ago agreed that the low limit was going to fallback
when it couldn't be satisfied.  But you seem implacably opposed to that
as default, and I can well believe that Google is so accustomed to OOMing
that it is more comfortable with OOMing as the default.  Okay.  But I
would expect there to be many who want the attempt towards isolation that
low limit offers, without a collapse to OOM at the first misjudgement.

Hugh

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