Re: [Xen-devel] sparse M2P table

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 16.09.09 12:39 >>>
>On 16/09/2009 11:04, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:
>
>> I'm in the process of putting together patches to eliminate undue overhead
>> resulting from Xen's current assumption on a non-sparse machine address
>> map. After removing large holes (symmetric across all nodes) from the
>> machine address map and after also mapping the resulting (much smaller)
>> frame table sparsely (to account for smaller holes distinct for one or more
>> nodes), I intended to also map the P2M table sparsely.
>
>The guest P2Ms? Why would you want to do that - so that you can add some
>hierarchy (and therefore sparseness) to the pseuo-phys address space too?
>Otherwise I don't see why you would ever have a sparse P2M, and therefore
>why you would care about efficiently handling large holes in it.

Oh, typo (see subject) - I really mean the M2P table here. The P2M table
has no reason to be sparse.

Jan


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