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

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Message-ID: <20090312112953.GD6995@shareable.org>
Date:	Thu, 12 Mar 2009 11:29:53 +0000
From:	Jamie Lokier <jamie@...reable.org>
To:	uClinux development list <uclinux-dev@...inux.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>, peterz@...radead.org,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [uClinux-dev] RE: [PATCH] NOMMU: Pages allocated to a ramfs inode's pagecache may get wrongly discarded

Berkhan, Enrik (GE Infra, Oil & Gas) wrote:
> Andrew Morton wrote:
> > On Wed, 11 Mar 2009 15:30:35 +0000
> > David Howells <dhowells@...hat.com> wrote:
> >> From: Enrik Berkhan <Enrik.Berkhan@...com>
> >> 
> >> The solution is to mark the pages dirty at the point of allocation by
> >> the truncation code.
> > 
> > Was there a specific reason for using the low-level SetPageDirty()?
> 
> No, no specific reason. It was just my first try of a fix after spotting 
> the problem. After a short discussion with David, we decided to wait for 
> others' comments on using the low-/high-level approach.

Tangentially related...

Does the vm pageout logic include or skip these "dirty" pages looking
for candidates to flush to storage?  What about with MMU?

-- Jamie
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