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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Message-ID: <45D55805.908@goop.org>
Date:	Thu, 15 Feb 2007 23:06:45 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andrew Morton <akpm@...ux-foundation.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.

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.

    J

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