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

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Andrew Morton wrote:
> On Thu, 15 Feb 2007 18:25:00 -0800 Jeremy Fitzhardinge <jeremy@xxxxxxxx> 
> 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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