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

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Message-ID: <20090313224908.GA2271@cmpxchg.org>
Date:	Fri, 13 Mar 2009 23:49:08 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	David Howells <dhowells@...hat.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, peterz@...radead.org,
	Enrik.Berkhan@...com, uclinux-dev@...inux.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.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

On Fri, Mar 13, 2009 at 11:53:02AM +0000, David Howells wrote:
> KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:
> 
> > David, Could you please try following patch if you have NOMMU machine?
> > it is straightforward porting to nommu.
> 
> Is this patch actually sufficient, though?  Surely it requires an alteration
> to ramfs to mark the page as being unevictable?

ramfs already marks the whole address space of each inode as
unevictable, see ramfs_get_inode().

The reclaim code will regard this when the config option is enabled.

	Hannes
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