linux-kernel - Re: [patch 4/6] mm: merge populate and nopage into fault (fixes nonlinear)

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Message-Id: <20070307010756.b31c8190.akpm@linux-foundation.org>
Date:	Wed, 7 Mar 2007 01:07:56 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	mingo@...e.hu, npiggin@...e.de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, benh@...nel.crashing.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [patch 4/6] mm: merge populate and nopage into fault (fixes
 nonlinear)

On Wed, 07 Mar 2007 09:51:57 +0100 Miklos Szeredi <miklos@...redi.hu> wrote:

> > > Dirty page accounting doesn't work either on
> > > non-linear mappings
> > 
> > It doesn't?  Confused - these things don't have anything to do with each
> > other do they?
> 
> Look in page_mkclean().  Where does it handle non-linear mappings?
> 

OK, I'd forgotten about that.  It won't break dirty memory accounting,
but it'll potentially break dirty memory balancing.

If we have the wrong page (due to nonlinear), page_check_address() will
fail and we'll leave the pte dirty.  That puts us back to the pre-2.6.17
algorithms and I guess it'll break the msync guarantees.

Peter, I thought we went through the nonlinear problem ages ago and decided
it was OK?
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