linux-kernel - Re: [patch 11/21] Xen-paravirt: Add apply_to_page_range() which applies a function to a pte range.

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Date:	Thu, 15 Feb 2007 23:19:36 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andi Kleen <ak@....de>, linux-kernel@...r.kernel.org,
	virtualization@...ts.osdl.org, xen-devel@...ts.xensource.com,
	Chris Wright <chrisw@...s-sol.org>,
	Zachary Amsden <zach@...are.com>,
	Ian Pratt <ian.pratt@...source.com>,
	Christian Limpach <Christian.Limpach@...cam.ac.uk>,
	Christoph Lameter <clameter@....com>
Subject: Re: [patch 11/21] Xen-paravirt: Add apply_to_page_range() which
 applies a function to a pte range.

On Thu, 15 Feb 2007 23:06:45 -0800 Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Andrew Morton wrote:
> > On Thu, 15 Feb 2007 18:25:00 -0800 Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> >
> >   
> >> Add a new mm function apply_to_page_range()[...]
> > There was some discussion about this sort of thing last week.  The
> > consensus was that it's better to run the callback against a whole pmd's
> > worth of ptes, mainly to amortise the callback's cost (a lot).
> >
> > It was implemented in
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.20/2.6.20-mm1/broken-out/smaps-extract-pmd-walker-from-smaps-code.patch
> 
> Yes I was looking at that and wondering what the upshot would be.  I'll
> have a closer look, but it seems like it should be usable.

It's a question of who-merges-first.  I wasn't planning on merging the
smaps stuff into 2.6.21.

Perhaps the best approach is to proceed as-is and clean things up once it's
all merged.

I guess your pte-at-a-time walker could be quite simply implemented underneath
the smaps pmd-at-a-time walker.
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