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Re: [Xen-devel] [PATCH] tools: convert cpumap bitmap to list

On 20 Oct 2005, at 17:23, Ryan Harper wrote:

I would think mapping cpu % nr_cpus, throwing away duplicates would be
best.  With [0,1,2,3] and nr_cpus=2, cpumap would be [0,1].

I think Xen should ignore non-existent cpus in a cpumap. I'm not really
fussed what you do with them in xend -- ignoring them there too would
probably make most sense.

I am a little concerned that if a user pins a vcpu to cpus 0-7 , on a
two-way, and the output of vcpu-list shows him [0,1], that it might look like the pin operation didn't work. If this isn't a big deal, then I'll
also look at throwing out invalid cpus from the cpumap representation.

If the user is trying to pin to CPUs 0-7 on a dual-cpu system, maybe the user doesn't know what they're doing. :-)

You can trust Xen itself to ignore non-existsent CPUs in a cpumap. Whether you filter them out in xend or not I think doesn't matter a great deal.

 -- Keir

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