Date: Fri, 13 Mar 2009 23:49:08 +0100
From: Johannes Weiner <hannes@cmpxchg.org>
To: David Howells <dhowells@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       Minchan Kim <minchan.kim@gmail.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       torvalds@linux-foundation.org, peterz@infradead.org,
       Enrik.Berkhan@ge.com, uclinux-dev@uclinux.org,
       linux-kernel@vger.kernel.org, linux-mm@kvack.org,
       Rik van Riel <riel@surriel.com>,
       Lee Schermerhorn <lee.schermerhorn@hp.com>
Subject: Re: [PATCH] NOMMU: Pages allocated to a ramfs inode's pagecache may get wrongly discarded
Message-ID: <20090313224908.GA2271@cmpxchg.org>
References: <20090312100049.43A3.A69D9226@jp.fujitsu.com> <20090311170207.1795cad9.akpm@linux-foundation.org> <28c262360903111735s2b0c43a3pd48fcf8d55416ae3@mail.gmail.com> <27074.1236945182@redhat.com>
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On Fri, Mar 13, 2009 at 11:53:02AM +0000, David Howells wrote:
> KOSAKI Motohiro <kosaki.motohiro@jp.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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