[Xen-devel] Re: pv_ops & gntdev?

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Gerd Hoffmann wrote:
> Jeremy Fitzhardinge wrote:
>   
> > Hm, I hope not.  Doesn't it always end up using set_pte*?
> >     
> ptep_get_and_clear_full();
>
> See zap_pte_range() in mm/memory.c
Ah, right.  It could be changed to use ptep_modify_prot_start/commit.  
That would make it batchable too.  Slightly less good for native.
   J


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