Re: [libvirt] libvirt/libxl implemetation of get_online_cpu / virNodeGetCPUMap?
On Tue, 2015-02-24 at 12:41 +0000, Anthony PERARD wrote:
Hi,
A recent OpenStack nova commit make use of virNodeGetCPUMap to get the list
of online cpu of a host. But this API is not implemented for the libvirt
xen driver.
The commit:
Add handling for offlined CPUs to the nova libvirt driver.
https://review.openstack.org/gitweb?p=openstack/nova.git;a=commitdiff;h=0...
Is there a need to use this under Xen? (Is it possible to have offline
CPU?).
Yes, I think so. No idea how you use it though.
What libxl API those provide this information, if it exist?
I found libxl_get_online_cpus() but that not enough. They want a
bitmap.
I think that is all which currently exists, at least at the libxl level,
you may need to add a new interface.
It'd be worth looking into the various host numa interfaces -- perhaps
one of them indirectly exposes what you want?
Ian.