Re: [Xen-devel] VM Migration on a NUMA server?

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Jul 31, 2015 at 11:41:11AM +0000, Kun Cheng wrote:
> Let me be more specific, such idea is for the NUMA scheduling as currently
> xen only migrate vcpus but leave memory at the previous node.
> 

Xen doesn't support memory migration at the moment. However Xen scheduler
won't migrate vcpus out of its NUMA node in most cases.

I will let Dario (CC'ed) confirm. He might also able to give you
pointers if you want to work on such feature.

Wei.

> Kun Cheng <chengkunck@xxxxxxxxx>ä2015å7æ31æ åä10:32åéï
> 
> > Hi all,
> >
> > I'm sorry for taking your time and I'd like to make an enquery about the
> > status of VM migration support on a NUMA server. Currently It looks like
> > when a vm is migrated only its vcpus are moved to the other node but not
> > its memory. So, is anyone trying to fix that issue? If I want to do it
> > myself, it seems like two major problems are ahead of me:
> >
> > 1) How to specify the target node for memory migration? I'll be grateful
> > if anyone can give me  some hints.
> >
> > 2) Memory Migration. Looks like it can be done by leveraging the existing
> > migration related functions on Xen.
> >
> > I don't have much practical experience on NUMA machines. And I'll be
> > appreciated for any reply & help.
> >
> > Thanks,
> > Kenneth
> >

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