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

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Message-Id: <20081211204006.3312.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Thu, 11 Dec 2008 20:44:57 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	kosaki.motohiro@...fujitsu.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 Thu, Dec 11 2008, KOSAKI Motohiro wrote:
> > > > No objection from me, getting rid of configuration options almost
> > > > always gets my vote :)
> > > 
> > > Yeah, mine too. One recent addition was CONFIG_UNEVICTABLE_LRU - why on
> > > earth is that an option?!
> > 
> > As far as I know, CONFIG_UNEVICTABLE_LRU depend on CONFIG_MMU
> > because any unevictable lru developer don't have nommu machine ;)
> > 
> > I expect that nobody of mmu user don't turn off unevictable lru feature.
> 
> Perhaps I didn't frase the question correctly. My question is, why is it
> a visible option? Does it make ANY sense to turn off
> CONFIG_UNEVICTABLE_LRU?

very difficult question...

As far as I know, CONFIG_UNEVICTABLE_LRU doesn't have any bad side effect.
So, I expect we can remove UNEVICTABLE_LRU Kconfig option in the future.

but it is _not_ VM developr consensus. just my thinking.



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