[Libvir] CPU pinning of domains at creation time

Daniel Veillard veillard at redhat.com
Fri Oct 12 09:12:13 UTC 2007

On Fri, Oct 12, 2007 at 05:02:11PM +0900, Saori Fukuta wrote:
> On Thu, 11 Oct 2007 09:00:14 -0400 Daniel Veillard wrote:
> >    - for the mapping at the XML level I suggest to use a simple extension
> >      to the <vcpu>n</vcpu> and extend it to
> >      <vcpu cpuset='2,3'>n</vcpu>
> >      with a limited syntax which is just the comma separated list of
> >      allowed CPU numbers (if the code actually detects such a cpuset is
> >      in effect i.e. in general this won't be added).
> How about adding <cpus>2,3</cpus> to the XML simply ?

  it's not any simpler. It's more complex because it adds a new element node
in the XML. Moreover I don't expect taht information to be any more structured
so it does not make sense to me to expose it as element content, plus
<cpus> could be used in the future to describe fully structured informations
so I don't think it makes sense to use it for just the cpuset.

> And we may set 64 CPUs, it is hard to set all of them by each number.
> (i.e. we have to set cpuset='1,2,3,4,5,6,7,8,9,10,....,64')
> So I hope to use - (range) and ^ (negation) to set cpuset as Ryan said.

  On input why not. Do you have a complete description of the syntax
you want to allow ?


Red Hat Virtualization group http://redhat.com/virtualization/
Daniel Veillard      | virtualization library  http://libvirt.org/
veillard at redhat.com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
http://veillard.com/ | Rpmfind RPM search engine  http://rpmfind.net/

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