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

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Message-Id: <E1HOsP0-0008K3-00@dorka.pomaz.szeredi.hu>
Date:	Wed, 07 Mar 2007 10:25:42 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	akpm@...ux-foundation.org
CC:	mingo@...e.hu, npiggin@...e.de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, benh@...nel.crashing.org,
	a.p.zijlstra@...llo.nl
Subject: Re: [patch 4/6] mm: merge populate and nopage into fault (fixes
 nonlinear)

> > 
> > 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.

It won't even get that far, because it only looks at vmas on
mapping->i_mmap, and not on i_mmap_nonlinear.

Miklos
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