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

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Message-ID: <20070307095212.GF8609@wotan.suse.de>
Date:	Wed, 7 Mar 2007 10:52:12 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management <linux-mm@...ck.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [patch 4/6] mm: merge populate and nopage into fault (fixes nonlinear)

On Wed, Mar 07, 2007 at 10:22:52AM +0100, Ingo Molnar wrote:
> 
> * Nick Piggin <npiggin@...e.de> wrote:
> 
> > After these patches, I don't think there is too much burden. The main 
> > thing left really is just the objrmap stuff, but that is just handled 
> > with a minimal 'dumb' algorithm that doesn't cost much.
> 
> ok. What do you think about the sys_remap_file_pages_prot() thing that 
> Paolo has done in a nicely split up form - does that complicate things 
> in any fundamental way? That is what is useful to UML.

Last time I looked (a while ago), the only issue I had was that he was
doing a weird special case rather than using another !present pte bit
for his "nonlinear protection" ptes.

I think he fixed that now and so it should be quite good now.
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