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

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Date:	Fri, 12 Dec 2008 11:35:32 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Hugh Dickins <hugh@...itas.com>
CC:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.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

Hugh Dickins wrote:
> On Sat, 13 Dec 2008, KOSAKI Motohiro wrote:
>   
>> 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.
On swapless systems (with CONFIG_SWAP=n), we never scan
the anon lists, so we do not need to split out the mlocked pages from
the anon pages.

On a system with swap, we want to split out the mlocked pages
so that scan balancing always works right.  So whenever
CONFIG_SWAP is on, we want CONFIG_UNEVICTABLE_LRU
to be on as well.

That means we can replace CONFIG_UNEVICTABLE_LRU
with CONFIG_SWAP throughout the code, and get a kernel
with the desired behaviour either way.


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