Use Kvmtop in 2nd Virtualization

[phamngocsonls]

I using Kvmtop to monitor cpu steal time. But i'm using an VM have been virtualized and i installed openstack on this VM. When i use kvmtop, cpu core and cpu steal time = 0.

[cha87de]

Hi @phamngocsonls

your setup looks as follows, having two KVM virtualisation layers with pass through mode enabled, and kvmtop is running inside the 1st level virtual machine - is that correct?

   +-------------------------------+
   |                               |
   |   +--------+ +---------+      |
   |   |        | |         |      |
   |   | VM 2nd | | VM 2nd  |      |
   |   | level  | | level   |      |
   |   |        | |         |      |
   |   |        | |         |      |
   |   |        | |         |      |
   |   +--------+ +---------+      |
   |                               |
   |  Virtual Machine     kvmtop   |
   |  with KVM                     |
   |                               |
+--+-------------------------------+--+
|                                     |
|                                     |
|  Physical Host with KVM             |
|                                     |
|                                     |
+-------------------------------------+

Then you're not getting per VM metrics for virtual CPU cores and virtual CPU steal value?
Do you get values for virtual CPU utilisation? (that value should be unavailable as well, I guess)

The problem is probably, that kvmtop cannot get process IDs for the virtual CPU cores from libvirt. To verify, can you please run the following commands and send me the output?

virsh -c qemu:///system qemu-monitor-command --hmp $DOMAINNAME info cpus

You should get something like * CPU #0: thread_id=1315.

[cha87de]

Any chance to get the requested details @phamngocsonls ? Thanks for your support

[phamngocsonls]

This is my output
CPU #0: pc=0xffffffff8103df56 (halted) thread_id=26076
CPU #0: pc=0xffffffff8103df56 (halted) thread_id=29421
CPU #0: pc=0xffffffff8103df56 (halted) thread_id=28209
CPU #0: pc=0xffffffff8103df56 (halted) thread_id=28893

[cha87de]

Great, thanks. So the thread ids are available. Can you check, if the schedstat files are available in your procfs folder for each of the thread ids? e.g. what is the content of this file: /proc/26076/schedstat (if 26076 is still a valid thread id)?

[phamngocsonls]

Hi, my result:
root@hlc-cs-lab-sonpn13-vcompute:/home/cloud# cat /proc/4990/schedstat
9843199997 400541737 19462

root@hlc-cs-lab-sonpn13-vcompute:/home/cloud# cat /proc/4997/schedstat
10171044199 334163047 21413