Re: [Xen-devel] [RFC PATCH] PVH: cleanup of p2m upon p2m destroy

[Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>]

Am Mittwoch 18 Dezember 2013, 10:03:00 schrieb Jan Beulich:
> >>> On 18.12.13 at 03:44, Mukesh Rathor <mukesh.rathor@xxxxxxxxxx> wrote:
> > An alternative might be to just create a link list then and walk it. In
> > general, foreign mappings should be very small,
> 
> That's according to the usage you're aware of. I think Fujitsu's
> tools to control BS2000 guests map huge parts of guest memory
> (if not all of it).

Yes, that's true, think  of dimensions in GB.

Dietmar.

> 
> > so the overhead of
> > 16 bytes per page for the link list might not be too bad. I will code
> > it if there is no disagreement from any maintainer... everyone has 
> > different ideas :)...
> > 
> > Or better, if I add a count of foreign mappings and hang it off the 
> > p2m_domain, then this code would only execute in case of control
> > domain going away... it seems in that case walking the p2m would be
> > tolerable. That should be acceptable?
> 
> That would at least be a first step (following the shared page
> count maintained for a domain). I don't think this is going to be
> good enough though considering disaggregation.
> 
> Jan
> 
> 
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