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[Xen-devel] Re: [PATCH] Add hypercall to mark superpages to improve performance


  • To: Dave McCracken <dcm@xxxxxxxx>
  • From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
  • Date: Fri, 30 Apr 2010 14:30:11 -0700
  • Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Xen Developers List <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Fri, 30 Apr 2010 14:31:25 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcronZePAP0nxKFhQeKdK+VxyQ9jrQADriV7
  • Thread-topic: [PATCH] Add hypercall to mark superpages to improve performance

On 30/04/2010 12:43, "Dave McCracken" <dcm@xxxxxxxx> wrote:

>> Secondly, I don't really believe that the mark/unmark
>> hypercalls are race-free -- bearing in mind, that other mappings (superpage
>> or otherwise) can be constructed or deleted in parallel on other cpus.
> 
> I'll look into what can be done to prevent races.  I suspect some races we
> don't care about.

I mean I think there are probably races that can result in inconsistent
reference counts. I reckon I'll be able to find some when I'm back from
travelling next week. Obviously, any such race would be unacceptable.

 -- Keir



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