[Xen-devel] Re: [RFC PATCH 30/35] Add generic_page_range() function

[Nick Piggin <nickpiggin@xxxxxxxxxxxx>]

Keir Fraser wrote:

> > lastly, you don't allow any control over the type of pages that are
> > walked: this could well be unusably slow for some cases. At least
> > you should proably design the interface so we can iterate over
> > present, not present, all, etc so it becomes widely usable. Normally
> > I'd say to wait until users come up but in this case the function
> > isn't a speed demon anyway, and you also don't want to give people
> > any excuses not to use it.
>
> You mean iterate only over PTEs that are already present, or only those 
> that were *not* previously present, or all (present and non-present)? Is 
> that really useful? If so then yes, it's not hard to add.
Yes. If you look at all the code that walks pagetables (including those
that just operate on a single pte) in arch/ and other places, there is
a fair diversity. A function called generic_page_range() would surely be
able to replace all those ;)

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