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[Xen-devel] Re: [PATCH] Add hypercall to mark superpages to improve perf
| To: | Dave McCracken <dcm@xxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: [PATCH] Add hypercall to mark superpages to improve performance |
| 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 |
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| In-reply-to: | <201004301443.23350.dcm@xxxxxxxx> |
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| Thread-index: | AcronZePAP0nxKFhQeKdK+VxyQ9jrQADriV7 |
| Thread-topic: | [PATCH] Add hypercall to mark superpages to improve performance |
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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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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