linux-kernel - Re: [PATCH] Kconfig: CONFIG_UNEVICTABLE

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Message-Id: <20090513191221.674bc543.minchan.kim@barrios-desktop>
Date:	Wed, 13 May 2009 19:12:21 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Minchan Kim <minchan.kim@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Matt Mackall <mpm@...enic.com>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH] Kconfig: CONFIG_UNEVICTABLE_LRU move into EMBEDDED
 submenu

On Wed, 13 May 2009 17:59:34 +0900 (JST)
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> > Hi, Kosaki. 
> > 
> > On Wed, 13 May 2009 17:30:45 +0900 (JST)
> > KOSAKI Motohiro <kosaki.motohiro@...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.


Each people always have a different viewpoint. 
:) 

> 
> > > +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.

As I said previous(http://lkml.org/lkml/2009/3/16/209), Many embedded environment have a small ram. It doesn't have a big impact in such case. 

Let CCed embedded matainers. 
I won't have a objection if embedded maintainers ack this. 

Thanks for your effort for embdded. 

-- 
Kinds Regards
Minchan Kim
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