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

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Message-ID: <20070307100430.GA5080@wotan.suse.de>
Date:	Wed, 7 Mar 2007 11:04:30 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Miklos Szeredi <miklos@...redi.hu>, mingo@...e.hu,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	benh@...nel.crashing.org
Subject: Re: [patch 4/6] mm: merge populate and nopage into fault (fixes nonlinear)

On Wed, Mar 07, 2007 at 10:45:03AM +0100, Nick Piggin wrote:
> On Wed, Mar 07, 2007 at 10:32:22AM +0100, Peter Zijlstra wrote:
> > 
> > Can recollect as much, I modelled it after page_referenced() and can't
> > find any VM_NONLINEAR specific code in there either.
> > 
> > Will have a hard look, but if its broken, then page_referenced if
> > equally broken it seems, which would make page reclaim funny in the
> > light of nonlinear mappings.
> 
> page_referenced is just an heuristic, and it ignores nonlinear mappings
> and the page which will get filtered down to try_to_unmap.
> 
> Page reclaim is already "funny" for nonlinear mappings, page_referenced
> is the least of its worries ;) It works, though.

Or, to be more helpful, unmap_mapping_range is what it should be
modelled on.
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