linux-kernel - Re: PTE access rules & abstraction

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Message-Id: <1222148106.12085.95.camel@pasglop>
Date:	Tue, 23 Sep 2008 15:35:06 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Miller <davem@...emloft.net>
Cc:	npiggin@...e.de, jeremy@...p.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, hugh@...itas.com
Subject: Re: PTE access rules & abstraction

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).

Cheers,
Ben.


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