linux-kernel - Re: [PATCH] NOMMU: Pages allocated to a ramfs inode's pagecache may get wrongly discarded

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Message-Id: <20090312105622.43A6.A69D9226@jp.fujitsu.com>
Date:	Thu, 12 Mar 2009 11:00:18 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>, dhowells@...hat.com,
	torvalds@...ux-foundation.org, peterz@...radead.org,
	Enrik.Berkhan@...com, uclinux-dev@...inux.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...riel.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>
Subject: Re: [PATCH] NOMMU: Pages allocated to a ramfs inode's pagecache may get wrongly discarded

> Hi, Kosaki-san. 
> 
> I think ramfs pages's unevictablility should not depend on CONFIG_UNEVICTABLE_LRU.
> It would be better to remove dependency of CONFIG_UNEVICTABLE_LRU ?
> 
> How about this ? 
> It's just RFC. It's not tested. 
> 
> That's because we can't reclaim that pages regardless of whether there is unevictable list or not

maybe, your patch work.

but we can remove CONFIG_UNEVICTABLE_LRU build option itself completely 
after nommu folks confirmed CONFIG_UNEVICTABLE_LRU works well on their machine

it is more cleaner IMHO.
What do you think?



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