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Re: [Xen-devel] How to detect HAP from DomU?
| To: | Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] How to detect HAP from DomU? |
| From: | Keir Fraser <keir@xxxxxxx> |
| Date: | Wed, 10 Nov 2010 08:36:15 +0000 |
| Cc: | |
| Delivery-date: | Wed, 10 Nov 2010 00:37:12 -0800 |
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| Thread-topic: | [Xen-devel] How to detect HAP from DomU? |
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On 10/11/2010 08:22, "Juergen Gross" <juergen.gross@xxxxxxxxxxxxxx> wrote: > is there any way for a HVM-domain to detect whether it is running with HAP > enabled? I couldn't find any interface for this information. > > Background: in our BS2000 domain (HVM with PV-drivers) we sometimes have to > copy complete pages between kernel and user. An alternative to the copy > would be a remapping of the page. The remap is faster than the copy with HAP > enabled, but much slower without HAP. So it would be best to copy without HAP > and remap with HAP. You could do a few remaps and copies and see how long it takes? Has the advantage that you aren't tied up to one policy based on one system's timings for those particuler ops. I don't think basing policy on static assumptions about hidden implementation features is a good idea. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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