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=0696...
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.