linux-kernel - Re: [RFC][PATCH] avoid swapping out with swappiness==0

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Message-ID: <20120426142643.GA18863@alpha.arachsys.com>
Date:	Thu, 26 Apr 2012 15:26:43 +0100
From:	Richard Davies <richard.davies@...stichosts.com>
To:	Satoru Moriya <satoru.moriya@....com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Jerome Marchand <jmarchan@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"jweiner@...hat.com" <jweiner@...hat.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"riel@...hat.com" <riel@...hat.com>,
	"lwoodman@...hat.com" <lwoodman@...hat.com>,
	"shaohua.li@...el.com" <shaohua.li@...el.com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Seiji Aguchi <seiji.aguchi@....com>,
	Minchan Kim <minchan.kim@...il.com>
Subject: Re: [RFC][PATCH] avoid swapping out with swappiness==0

Satoru Moriya wrote:
> > I have run into problems with heavy swapping with swappiness==0 and 
> > was pointed to this thread ( 
> > http://marc.info/?l=linux-mm&m=133522782307215 )
> 
> Did you test this patch with your workload?

I haven't yet tested this patch. It takes a long time since these are
production machines, and the bug itself takes several weeks of production
use to really show up.

Rik van Riel has pointed out a lot of VM tweaks that he put into 3.4:
http://marc.info/?l=linux-mm&m=133536506926326

My intention is to reboot half of our machines into plain 3.4 once it is
out, and half onto 3.4 + your patch.

Then we can compare behaviour.


Will your patch apply cleanly on 3.4?

Richard.
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