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

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Message-Id: <1173263085.6374.132.camel@twins>
Date:	Wed, 07 Mar 2007 11:24:45 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Miklos Szeredi <miklos@...redi.hu>, 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, 2007-03-07 at 11:21 +0100, Nick Piggin wrote:
> 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.

Yeah, why don't we have a tree per nonlinear vma to find these pages?

wli mentions shadow page tables..

> > 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.

Seems to be the best quick solution indeed.

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