linux-kernel - Re: [PATCH] block: Fix LSF default inconsistency

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Date:	Fri, 12 Dec 2008 16:01:50 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Rik van Riel <riel@...hat.com>, Jens Axboe <jens.axboe@...cle.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] block: Fix LSF default inconsistency

On Sat, 13 Dec 2008, KOSAKI Motohiro wrote:
> >> Me neither, lets ask the originator of the patch. Rik, why is
> >> unevictable lru an option?
> >
> > I think we had some reasons to keep it as a separate config
> > option during development, but nowadays we might as well
> > put it all just under CONFIG_SWAP...
> 
> I'm sad ;)
> 
> To move mlocked file cache page to unevictable list is useful although
> swapless embedded device.

Yes, I don't understand why Rik suggested CONFIG_SWAP for it either.

> 
> Actually, number of scanning pages of reclaim is calculated by number
> of pages in list.
> if unevictable page stay in evictable list a lot, reclaim logic can
> calculate wrong scanning number.
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