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

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Date:	Tue, 24 Apr 2012 18:14:37 -0400
From:	Satoru Moriya <satoru.moriya@....com>
To:	Richard Davies <richard@...chsys.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

On 04/24/2012 04:20 AM, Richard Davies 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?
If yes, how did it come out?

> I strongly believe that Linux should have a way to turn off swapping 
> unless absolutely necessary. This means that users like us can run 
> with swap present for emergency use, rather than having to disable it 
> because of the side effects.

Agreed. That is why I proposed the patch.

> Personally, I feel that swappiness==0 should have this (intuitive) 
> meaning, and that people running RHEL5 are extremely unlikely to run 
> 3.5 kernels(!)
> 
> However, swappiness==-1 or some other hack is definitely better than 
> no patch.


Regards,
Satoru
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