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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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).

> 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


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel