linux-kernel - Re: [PATCH 1 of 13] Add apply_to_page_range() which applies a function to a pte range

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Message-Id: <1154492211.2570.43.camel@localhost.localdomain>
Date:	Wed, 02 Aug 2006 14:16:50 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Christoph Lameter <clameter@....com>
Cc:	Chris Wright <chrisw@...s-sol.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jeremy Fitzhardinge <jeremy@...source.com>, akpm@...l.org,
	linux-kernel@...r.kernel.org,
	Christian Limpach <Christian.Limpach@...cam.ac.uk>,
	Gerd Hoffmann <kraxel@...e.de>,
	Hollis Blanchard <hollisb@...ibm.com>,
	Ian Pratt <ian.pratt@...source.com>,
	Zachary Amsden <zach@...are.com>, npiggin@...e.de,
	Ian Wienand <ianw@...ato.unsw.edu.au>
Subject: Re: [PATCH 1 of 13] Add apply_to_page_range() which applies a
	function to a pte range

On Tue, 2006-08-01 at 14:31 -0700, Christoph Lameter wrote:
> On Tue, 1 Aug 2006, Chris Wright wrote:
> 
> > We got the opposite feedback the first time we posted this function.
> > Xen has some users, and I believe there's a couple in-tree functions we could
> > convert easily w/out overhead issues.  It's generic and this is just the
> > infrastructure, I think we should leave it.
> 
> Th generic method was proposed a number of times in the past including 
> by Nick Piggin and more recently by the page table abstraction layer 
> posted by Ian Wienand. See also 
> 
> http://www.gelato.org/pdf/apr2006/gelato_ICE06apr_unsw.pdf
> http://www.gelato.org/pdf/may2005/gelato_may2005_ia64vm_chubb_unsw.pdf.
> http://lwn.net/Articles/124961/
> 
> Special functionality may be attached at various levels, and we are very 
> sensitive to changes in this area.

Hi Christoph,

	Thanks for the pointers, but as you've been debating for 18 months now,
no patches are in the -mm tree or obviously about to go in, and this new
helper function is orthogonal to your work, I don't think it's
reasonable to delay this patch.

	All we can reasonably do is push this function back into the xen part
of the kernel tree for now.

Rusty.
-- 
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