RE: [Xen-devel] [PATCH] xen, tools/python/xen: pincpu support vcpus, add vcpu to cpu map

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> The following patch updates the dom0 pincpu operation to read 
> the VCPU value from the xend interface rather than 
> hard-coding the exec_domain to 0.  This prevented pinning 
> VCPUS other than 0 to a particular cpu.  I added the number 
> of VCPUS to the main xm list output and also included a new 
> sub-option to xm list to display the VCPU to CPU mapping.  
> While working on the pincpu code, I fixed an out-of-bounds 
> indexing for the pincpu operation that wasn't previously 
> exposed since the vcpu/exec_domain value was hard-coded to 0.

Ryan, good progress, but I'd like to propose a couple of extentions:

It would be useful if you could update it so that pincpu enabled you to
specify a set of physical CPUs for each VCPU e.g.

"xm pincpu mydom 1 2,4-6" which would allow VCPU 1 of mydom to run on
CPUs 2,4 and 5 but no others. -1 would still mean "run anywhere". Having
this functionality is really important before we can implement any kind
of CPU load ballancer.

Secondly, I think it would be really good if we could have some
hierarchy in CPU names. Imagine a 4 socket system with dual core hyper
threaded CPUs. It would be nice to be able to specify the 3rd socket,
1st core, 2nd hyperthread as CPU "2.0.1".

Where we're on a system without one of the levels of hierarchy, we just
miss it off. E.g. a current SMP Xeon box would be "x.y". This would be
much less confusing than the current scalar representation.
 
What do you think?

Thanks,
Ian

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