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.awas...@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 <ebl...@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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