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Re: [Xen-devel][PATCH] libxc bitmap utils and vcpu-affinity

To: Jan Beulich <JBeulich@xxxxxxxxxx>, Dulloor <dulloor@xxxxxxxxx>
Subject: Re: [Xen-devel][PATCH] libxc bitmap utils and vcpu-affinity
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Tue, 23 Mar 2010 11:05:27 +0000
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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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