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

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Date:	Sat, 12 May 2012 18:21:10 -0400
From:	Rik van Riel <riel@...hat.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>,
	"lwoodman@...hat.com" <lwoodman@...hat.com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Seiji Aguchi <seiji.aguchi@....com>
Subject: Re: [RFC][PATCH] avoid swapping out with swappiness==0

On 05/11/2012 05:11 PM, Satoru Moriya wrote:
> On 04/20/2012 08:21 PM, Satoru Moriya wrote:
>> Ah yes, it is not so small now.
>> On 4GB server, without THP min_free_kbytes is 8113 but with THP it is
>> 67584.
>>
>> How about using low watermark or min watermark?
>> Are they still big?
>>
>> ...or should we use other value?
>
> What do you think of the idea above?

I believe that using the high watermark is just fine.

We want to start swapping, before the page cache is so
small that we start thrashing from that.

> So, I propose that we start with applying this patch first
> and then discuss/improve the threshold.
>
> The patch may not be perfect but, at least, we can improve
> the kernel behavior in the enough filebacked memory case
> with this patch. I believe it's better than nothing.

Agreed.

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