Re: [Xen-devel] slow live magration / xc_restore on xen4 pvops

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 03/06/2010 02:04, "Brendan Cully" <Brendan@xxxxxxxxx> wrote:

> I've done a bit of profiling of the restore code and observed the
> slowness here too. It looks to me like it's probably related to
> superpage changes. The big hit appears to be at the front of the
> restore process during calls to allocate_mfn_list, under the
> normal_page case. It looks like we're calling
> xc_domain_memory_populate_physmap once per page here, instead of
> batching the allocation? I haven't had time to investigate further
> today, but I think this is the culprit.

Ccing Edwin Zhai. He wrote the superpage logic for domain restore.

 -- Keir



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