linux-kernel - Re: Tweaking swap algorithm under constrained memory usage

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Message-Id: <20101028120532.bf48b3f0.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 28 Oct 2010 12:05:32 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Pawan Singh <pawan@...ger.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Tweaking swap algorithm under constrained memory usage

On Wed, 27 Oct 2010 19:58:00 -0700
Pawan Singh <pawan@...ger.org> wrote:

> >
> > Recent kernel (2.6.28-) has splited LRUs as
> >  - active/inactive ANON
> >  - active/inactive FILE
> >  - LOCKED (UNEVICTABLE) ---(new)
> 
> Thanks for the reply. Does that mean that in 2.6.28 kernel, kswapd
> will modify its thresholds so that it only looks at active/inactive
> ANON?
> 

kswapd's threshold is not modifled. But because UNEVICTABLE LRU is not
scanned by kswapd, time consumption of kswapd is dramatically reduced.

About kswapd trigger, IIUC, /proc/sys/vm/min_free_kbytes is one.

Thanks,
-Kame

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