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Re: [Xen-devel] Allowing several mappings of a frame
| To: | Mohammad Hedayati <hedayati.mo@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Allowing several mappings of a frame |
| From: | Keir Fraser <keir.xen@xxxxxxxxx> |
| Date: | Thu, 27 Oct 2011 22:55:08 +0100 |
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| Delivery-date: | Thu, 27 Oct 2011 14:56:27 -0700 |
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| Thread-topic: | [Xen-devel] Allowing several mappings of a frame |
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On 27/10/2011 22:16, "Mohammad Hedayati" <hedayati.mo@xxxxxxxxx> wrote: > Xen currently allows granting a single frame to several domains, > several times (to map or copy). Though the feature itself seems > appealing, I wonder if there's a real use case in any ports or PV > aware applications (i.e. a page is mapped or copied by more than 2 > domains). Is there? It wouldn't typically happen. > Except the condition outlined above, PGC_count_mask part of a > page->count_info can be more than 1? Yes. Go trace some count_info values in a running system. Most will be >1. -- Keir > Thanks, > Mohammad > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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