[libvirt-users] virsh "cpu-stats" not working !!!

[SHREE DUTH AWASTHI]

Hi Again Eric,

Sorry for spamming.

Adding to the below mail. The cgroups are mounted at "/dev" as mentioned
below

# ls /dev/ | grep cgroup
cgroup_cpu
cgroup_cpuacct
cgroup_cpuset
cgroup_mem

On a liter note, " On 08/21/2013 03:55 AM, SHREE DUTH AWASTHI wrote: " is
coming by default while I try to reply. Anyway, I will explicitly modify it
from now.

Thanks and Regards,
Shree Duth Awasthi.


On Fri, Aug 23, 2013 at 9:16 AM, Shree Duth Awasthi <
shreeduth.awasthi at gmail.com> wrote:

> Hi Eric,
>
> Thanks for your valuable time and comments.
>
> >> Are you sure cpuacct was mounted prior to libvirtd starting?
> Yes, we are mounting cpuacct before starting the libvirtd daemon.
>
>  >> Libvirt won't mount cgroups;
> Yes, Agree.
>
> >>it only uses what was mounted at the time it was started.
> But we are mounting it well before it is started.
>
> We are facing the issue only while executing the "cpu-stats <domain name>"
> command.
>
> One more observation is that : While starting the domain, we are observing
> the below error.
>
> "2013-08-22 12:45:44.326+0000: 17554: warning : qemuSetupCgroupForVcpu:953
> : Unable to get vcpus' pids."
>
>  This may be the root cause of  virsh cpu-stats not working. ( seems to
> be because of CPU pinning issue )
>
> Because of this the VCPU directories are not created for the corresponding
> domain in "/dev/cgroup_<controller>/machine/<domain>.libvirt-qemu/" and
> hence the "cpu-stats" command is not working.
> Please let us know your view on this.
>
> We  have collected the debug logs, please find the attachment for the
> same..
>
>  Thanks and Regards,
> Shree Duth Awasthi.
>
>  On Wed, Aug 21, 2013 at 9:35 PM, Eric Blake <eblake at redhat.com> wrote:
>
>> On 08/21/2013 03:55 AM, SHREE DUTH AWASTHI wrote:
>>
>> [putting your name in ALL CAPS looks like you are shouting]
>>
>> >>
>> >> Hi All,
>> >>
>> >> Can you please guide us in solving this issue.
>> >>
>> >> Version used : libvirt-1.0.6
>> >> # rpm -qa | egrep  "libvirt|qemu"
>> >> qemu-kvm-0.14.1-1_WR4.3.x86_64_XXX.x86_64
>> >> libvirt-1.0.6-1_WR4.3.x86_64_XXX.2.x86_64
>> >>
>> >> Problem :
>> >>
>> >> # virsh cpu-stats CLA-0
>> >> error: Failed to retrieve CPU statistics for domain 'CLA-0'
>> >> *error: internal error error accessing cgroup cpuacct for vcpu*
>>
>> Are you sure cpuacct was mounted prior to libvirtd starting?
>>
>> >>
>> >> Related info :
>> >>
>> >> # cat /proc/cgroups
>> >> #subsys_name    hierarchy       num_cgroups     enabled
>> >> cpuset                      3                     4                  1
>> >> ns                             0                    1
>>  1
>> >> cpu                           1                    6                  1
>> >> cpuacct                     7                    3                  1
>>
>> The fact that it has a rather high hierarchy number (7) makes me think
>> you mounted it after the fact.
>>
>>
>> >>
>> >> We have also found that there is no "*cgroup*" directory created under
>> *
>> >> "/sys/fs/".* We have tried mounting the same manually using the below
>> >> commands but we were not successful.
>>
>> Cgroups are typically mounted by systemd in newer systems, but the fact
>> that you are trying to mount manually says that you aren't using
>> systemd.  Libvirt won't mount cgroups; it only uses what was mounted at
>> the time it was started.
>>
>> --
>> Eric Blake   eblake redhat com    +1-919-301-3266
>> Libvirt virtualization library http://libvirt.org
>>
>>
>
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