On 09/05/2012 07:32 AM, Tang Chen wrote:
4) Make libvirt not use cpuset cgroup. - For now, seems impossable. sched_setaffinity() behaves properly, which assumes the repluged cpu is the same one unpluged before. (am I right ?) But with cgroup's control, we cannot resolve this problem using sched_setaffinity().
If I want to solve the start failure problem, what should I do ?
Hi, I posted a comment some time ago about that. If you do not mount the cpuset controller, i.e for RHEL 6 you delete the cpuset line from /etc/cgconfig, the CPU affinity isn't controlled by cgroups any more but uses the old mechanism, which works as expected: take a host CPU offline and it will be removed from the process CPU mask and will show up again after onlining the host CPU. The only issue I currently see is that the display of virsh vcpuinfo and vcpupin is somewhat strange. Using taskset will however show the the correct affinity. I suggest that you try out that approach. -- Mit freundlichen Grüßen/Kind Regards Viktor Mihajlovski IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Martin Jetter Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen Registergericht: Amtsgericht Stuttgart, HRB 243294