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

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Message-ID: <20140611123109.GA17777@htj.dyndns.org>
Date:	Wed, 11 Jun 2014 08:31:09 -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

Hello, Michal.

On Wed, Jun 11, 2014 at 09:57:29AM +0200, Michal Hocko wrote:
> Is this the kind of symmetry Tejun is asking for and that would make
> change is Nack position? I am still not sure it satisfies his soft

Yes, pretty much.  What primarily bothered me was the soft/hard
guarantees being chosen by a toggle switch while the soft/hard limits
can be configured separately and combined.

> guarantee objections from other email.

I was wondering about the usefulness of "low" itself in isolation and
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.

Thanks.

-- 
tejun
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