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Re: [Xen-devel][PATCH] libxc bitmap utils and vcpu-affinity
| To: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel][PATCH] libxc bitmap utils and vcpu-affinity |
| From: | Dulloor <dulloor@xxxxxxxxx> |
| Date: | Tue, 23 Mar 2010 12:40:18 -0400 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx> |
| Delivery-date: | Tue, 23 Mar 2010 09:41:13 -0700 |
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Fine, I agree with you both. Attached is a patch adding utils for xenctl_bitmap (to libxc) and using the same in vcpu_(get|set)affinity. For the guest-numa interface, I will see if I can use xenctl_cpumap. -dulloor On Tue, Mar 23, 2010 at 7:05 AM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote: > On 23/03/2010 10:10, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote: > >>>>> Dulloor <dulloor@xxxxxxxxx> 22.03.10 18:44 >>> >>> Motivation for using xenctl_cpumask in Xen interfaces : >>> - xenctl_cpumap is just 4 bytes smaller than static xenctl_cpumask for >>> 128 cpus (128 would be good for quite some time). However, the new >> >> I don't buy this (we're already building for 256 CPUs, looking forward >> to further bump this in the not too distant future), and I'm generally >> opposed to introducing hard coded limits in a public interface. > > We should use xenctl_cpumask everywhere for specifying physical CPU bitmaps, > even into guest NUMA interfaces if appropriate. I don't really care if it is > a bit harder to use than a static bitmap. > > -- Keir > > >
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