[libvirt] Add persistent XML for cpu tunables

[Nikunj A. Dadhania]

On Sun, 27 Feb 2011 22:39:15 +0800, Osier Yang <jyang at redhat.com> wrote:
> These are pretty rough patches, something like a draft, I beleive
> there must be many problems, please review it heavily, :-)
> 
> New XML:
>   <cputune>
>     <shares>2048</shares>
>     <vcpupin vcpu='0' cpuset='0-4,^1'/>
>     <vcpupin vcpu='1' cpuset='1,3'/>
>     <vcpupin vcpu='2' cpuset='0,2'/>
>   </cputune>
> 
> "shares" is to define the the proportional weighted cpu share
> for the domain.
> 
> "vcpupin" is to define the cpu affinities of vcpus, it will
> not be displayed if one doesn't specify it explicitly in
> XML or set the cpu affinites for vcpu via "vcpupin", means
> there will be no vcpupin element in domain XML by default,
> and the constraints are:
> 
>   - Error if one specify entries more than the count of maxvcpus.
>   - Error when one specify entries for same vcpu.
>   - Error if value of attribute "vcpu" is more than count of
>     "maxvcpus - 1".
>   
>   Attribute "cpuset" works same as "cpuset" of element "vcpu",
> reuse the codes for parsing and formating value of "cpuset"
> of element "vcpu".
> 
> NB, the idea to add persistent XML for "cpushares" is from
> "Nikunj A. Dadhania":
> https://www.redhat.com/archives/libvir-list/2011-January/msg01183.html
> 
Thanks for picking the "cpushares" in this series.

Regards
Nikunj