[Xen-devel] Re: pv_ops & gntdev?

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Gerd Hoffmann wrote:
> Hmm.  One more Q:  How is pinning used?  Is a process pinned all the
> time?  Or can it happen that the pages are unpinned in case it does hang
> around idle for a while?  Is there some way to prevent a process from
> being unpinned?
>   
Pinning in the sense of Xen pagetables; a pagetable is pinned for the 
whole time the process exists - it gets pinned at fork/exec time, and 
unpin on exit.  (It has no effect on the residency of the usermode 
pages, though granted pages mapped into usermode would not be swappable 
at all.)
> I somehow feel like checking out mmu notifiers first ...
>   
Why's that?  What would you use them for?

   J

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