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

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Message-ID: <20070307102106.GB5555@wotan.suse.de>
Date:	Wed, 7 Mar 2007 11:21:06 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	a.p.zijlstra@...llo.nl, akpm@...ux-foundation.org, 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 11:13:20AM +0100, Miklos Szeredi wrote:
> > *sigh* yes was looking at all that code, thats gonna be darn slow
> > though, but I'll whip up a patch.
> 
> Well, if it's going to be darn slow, maybe it's better to go with
> mingo's plan on emulating nonlinear vmas with linear ones.  That'll be

There are real users who want these fast, though.

> darn slow as well, but at least it will be much less complicated.

IMO, the best thing to do is just restore msync behaviour, and comment
the fact that we ignore nonlinears. We need to restore msync behaviour
to fix races in regular mappings anyway, at least for now.

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