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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Minchan Kim <minchan.kim@gmail.com>
Subject: Re: [PATCH] Kconfig: CONFIG_UNEVICTABLE_LRU move into EMBEDDED submenu
Cc: kosaki.motohiro@jp.fujitsu.com, LKML <linux-kernel@vger.kernel.org>,
       linux-mm <linux-mm@kvack.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Lee Schermerhorn <Lee.Schermerhorn@hp.com>
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Date: Wed, 13 May 2009 17:59:34 +0900 (JST)
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> Hi, Kosaki. 
> 
> On Wed, 13 May 2009 17:30:45 +0900 (JST)
> KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote:
> 
> > Subject: [PATCH] Kconfig: CONFIG_UNEVICTABLE_LRU move into EMBEDDED submenu
> > 
> > Almost people always turn on CONFIG_UNEVICTABLE_LRU. this configuration is
> > used only embedded people.
> 
> I think at least embedded guys don't need it. 
> But I am not sure other guys. 

perhaps, I and you live in another embedded world.


> > +config UNEVICTABLE_LRU
> > +	bool "Add LRU list to track non-evictable pages" if EMBEDDED
> > +	default y
> 
> If you want to move, it would be better as following.
> 
> config UNEVICTABLE_LRU
>        bool "Add LRU list to track non-evictable pages" if EMBEDDED
>        default !EMBEDDED

No.
As far as I know, many embedded guys use this configuration.

they hate unexpected latency by reclaim. !UNEVICTABLE_LRU increase
unexpectability largely.