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

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Date:	Sat, 13 Dec 2008 00:11:39 +0900
From:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
To:	"Rik van Riel" <riel@...hat.com>
Cc:	"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

>> 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.

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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