linux-kernel - Re: PTE access rules & abstraction

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Message-ID: <20080923061843.GA29718@wotan.suse.de>
Date:	Tue, 23 Sep 2008 08:18:43 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	David Miller <davem@...emloft.net>, jeremy@...p.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, hugh@...itas.com
Subject: Re: PTE access rules & abstraction

On Tue, Sep 23, 2008 at 03:35:06PM +1000, Benjamin Herrenschmidt wrote:
> On Mon, 2008-09-22 at 20:16 -0700, David Miller wrote:
> > 
> > To a certain extent this is what BSD does in it's pmap layer, except
> > that they don't have the page table datastructure abstraction like
> > Linus does in the generic code, and which I think was a smart design
> > decision on our side.
> > 
> > All of the pmap modules in BSD are pretty big and duplicate a lot of
> > code that arch's don't have to be mindful about under Linux.
> 
> I definitely agree, I don't think we want to go away from the page table
> as being the abstraction :-) But I'm wondering if we can do a little bit
> better with the accessors to those page tables.
> 
> BTW. am I the only one to have got one copy of David's reply (that I'm
> quoting) coming with a From: Nick Piggin in the headers ? (apparently
> coming from kvack).

No. I see that, and so does marc.

http://marc.info/?t=122184627700007&r=1&w=2

And I've only ever seen it from Dave on kvack.
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