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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

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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