linux-kernel - Re: [PATCH] doc: describe memcg swappiness more precisely memory.swappiness==0

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Message-ID: <alpine.DEB.2.00.1210151754220.31712@chino.kir.corp.google.com>
Date:	Mon, 15 Oct 2012 17:54:37 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Michal Hocko <mhocko@...e.cz>
cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] doc: describe memcg swappiness more precisely
 memory.swappiness==0

On Tue, 16 Oct 2012, Michal Hocko wrote:

> And a follow up for memcg.swappiness documentation which is more
> specific about spwappiness==0 meaning.
> ---
> From 1bc3a94fea728107ed108edd42df464b908cd067 Mon Sep 17 00:00:00 2001
> From: Michal Hocko <mhocko@...e.cz>
> Date: Mon, 15 Oct 2012 11:43:56 +0200
> Subject: [PATCH] doc: describe memcg swappiness more precisely
> 
> since fe35004f (mm: avoid swapping out with swappiness==0) memcg reclaim
> stopped swapping out anon pages completely when 0 value is used.
> Although this is somehow expected it hasn't been done for a really long
> time this way and so it is probably better to be explicit about the
> effect. Moreover global reclaim swapps out even when swappiness is 0
> to prevent from OOM killer.
> 
> Signed-off-by: Michal Hocko <mhocko@...e.cz>

Acked-by: David Rientjes <rientjes@...gle.com>
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