linux-kernel - Re: [PATCH v2 0/4] memcg: Low-limit reclaim

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Message-ID: <alpine.LSU.2.11.1406041218080.9583@eggly.anvils>
Date:	Wed, 4 Jun 2014 12:18:59 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Johannes Weiner <hannes@...xchg.org>
cc:	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>,
	Tejun Heo <tj@...nel.org>, Hugh Dickins <hughd@...gle.com>,
	Roman Gushchin <klamm@...dex-team.ru>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH v2 0/4] memcg: Low-limit reclaim

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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