Re: [Libvir] [PATCH] finish NUMA code reorg, plug cpuset at creat time support
On Wed, 24 Oct 2007 05:12:42 -0400 Daniel Veillard wrote:
On Wed, Oct 24, 2007 at 04:38:50PM +0900, Saori Fukuta wrote:
> I confirmed how I can get the cpus values at fedora8(xen-3.1.0-10.fc8),
> and I expected to be emitted "(cpus '0,1')", when I specified
> "cpuset='0,1'". But xend shows nothing about cpus.
Right don't assume it's there on output of the xend S-Expr for that
domain, look at xm info --long it doesn't show it.
Yep, it's my fault. Thank you for pointing that.
To extract the cpuset
you need to call the existing functionalities we have for the vcpu
affinities (and this may be a bit costly).
> Then, I could not get the cpus values by sexpr_node(root, "domain/cpus").
>
> I guess this is a bug of Xen, and this has not been fixed with latest
> upstream Xen. So I will work about this for Xen before discussing about
> how xend exports.
It was never in xen and I think teh new way being based on Xen-API you
won't get a fix for upstream for our case here. I would not expect a fix
to xend to get the solution but work it out in libvirt, but you can try ...
I reconsidered about it and I agreed with you, because we won't get
the cpus values when pined several PCPU to each VCPU, like the
following case:
domA VCPU:0 PCPU:0-1
VCPU:1 PCPU:0-1
VCPU:2 PCPU:2
VCPU:3 PCPU:3
And, we certainly can get the vcpu affinities above by other way
(i.e. call "xenDaemonDomainGetVcpus" and analyze the result), but
it will be costly at this time, though I would like to make them.
So could you commit the patch first to support the cpus value
at starting/defining the guest domain for RHEL5.2 ?
Please let me know if you have any comments and suggestions.
thanks !
Saori
Attachments:
- cpuset_add2.patch (application/octet-stream — 2.3 KB)