linux-kernel - Re: [-mm][PATCH 1/10] fix UNEVICTABLE_LRU and !PROC_PAGE

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Date:	Thu, 3 Jul 2008 09:16:37 -0400
From:	Rik van Riel <riel@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Benjamin Kidwell <benjkidwell@...oo.com>
Subject: Re: [-mm][PATCH 1/10] fix UNEVICTABLE_LRU and !PROC_PAGE_MONITOR
 build

On Thu, 03 Jul 2008 15:02:23 +0900
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> > >  config UNEVICTABLE_LRU
> > >  	bool "Add LRU list to track non-evictable pages"
> > >  	default y
> > > +	select PAGE_WALKER
> > 
> > So what do we do?  Make UNEVICTABLE_LRU depend on CONFIG_MMU?  That
> > would be even worse than what we have now.
> 
> I'm not sure about what do we do. but I'd prefer "depends on MMU".
> because current munlock implementation need pagewalker.
> So, munlock rewriting have high risk rather than change depend on.
> 
> Rik, What do you think?

I suspect that systems without an MMU will not run into
page replacement scalability issues, so making the
UNEVICTABLE_LRU config option depend on MMU should be
ok.

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