RE: [Xen-devel] Re: super page with live migration

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Ian Pratt [mailto:Ian.Pratt@xxxxxxxxxxxxx]
>Sent: Sunday, September 28, 2008 10:17 PM
>
>> I'm not familiar with restore proecss. Just a curious question.
>> Is it difficult or intrusive if we still keep 2MB frame even when
>> next 511 pages across batch boundary?
>
>We should optimistically allocate a 2MB frame if the rest of the batch
>we can see is contiguous.
>
>> Then when pages in
>> future batches come, we just copy them into previously
>> allocated 2MB frame covering them.
>
>Yes, they'll already have p2m table entries as a result of the earlier
>allocation.
>
>If the frames turn out not to be contiguous, we should
>allocate a buffer
>in the heap, copy the earlier pages into it, free the 2MB frame,
>allocate 4KB frames and copy the data in.
>
>> I'm just not sure about
>> the possibility for an individual 4k pseudo-phys page occuring
>> in early patch, which then result most following superpages
>> across batch boundary, and thus few 2MB frame can be
>> allocated in target side. Maybe this concern is not true due to
>> batch creation in save process? :-)
>
>The first iteration sends frames in-order, so it should be fine.
>

OK, same page then. I misunderstood your comments a bit
before.

Thanks,
Kevin

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