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[libvirt] Redhat 7: cgroup CPUACCT controller is not mounted



Hi,

With a non-root user account, I am launching virtual machines and would like to get CPU stats for each Core (using python API or not) but face the following problem:

- When I issue the command "virsh --readonly cpu-stats MY_DOMAIN" I got the following error:

error: Failed to retrieve CPU statistics for domain 'MY_DOMAIN'
error: Requested operation is not valid: cgroup CPUACCT controller is not mounted

- I checked that cgroup is well mounted:

$ cat /proc/mounts | grep cgroup
tmpfs /sys/fs/cgroup tmpfs ro,nosuid,nodev,noexec,mode=755 0 0
cgroup /sys/fs/cgroup/systemd cgroup rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd 0 0
cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0
cgroup /sys/fs/cgroup/hugetlb cgroup rw,nosuid,nodev,noexec,relatime,hugetlb 0 0
cgroup /sys/fs/cgroup/pids cgroup rw,nosuid,nodev,noexec,relatime,pids 0 0
cgroup /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0
cgroup /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 0 0
cgroup /sys/fs/cgroup/cpu,cpuacct cgroup rw,nosuid,nodev,noexec,relatime,cpuacct,cpu 0 0
cgroup /sys/fs/cgroup/net_cls,net_prio cgroup rw,nosuid,nodev,noexec,relatime,net_prio,net_cls 0 0
cgroup /sys/fs/cgroup/perf_event cgroup rw,nosuid,nodev,noexec,relatime,perf_event 0 0
cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0
cgroup /sys/fs/cgroup/memory cgroup rw,nosuid,nodev,noexec,relatime,memory 0 0

$ cat /proc/cgroups 
#subsys_name    hierarchy       num_cgroups     enabled
cpuset  6       1       1
cpu     7       1       1
cpuacct 7       1       1
memory  11      1       1
devices 2       1       1
freezer 5       1       1
net_cls 8       1       1
blkio   10      1       1
perf_event      9       1       1
hugetlb 3       1       1
pids    4       1       1
net_prio        8       1       1

- I checked the system-cgtop but don't have no CPU info for my VMs (first line starting with /):

Path                                                                                                                 Tasks   %CPU   Memory  Input/s Output/s

/                                                                                                                      332  808.0    21.3G        -        -
/system.slice/auditd.service                                                                                             1      -        -        -        -
/system.slice/crond.service                                                                                              1      -        -        -        -
/system.slice/dbus.service                                                                                               1      -        -        -        -
/system.slice/gssproxy.service                                                                                           1      -        -        -        -
/system.slice/irqbalance.service                                                                                         1      -        -        -        -
/system.slice/ksmtuned.service                                                                                           2      -        -        -        -
/system.slice/libvirtd.service                                                                                           1      -        -        -        -
/system.slice/lvm2-lvmetad.service                                                                                       1      -        -        -        -
/system.slice/polkit.service                                                                                             1      -        -        -        -
/system.slice/rhnsd.service                                                                                              1      -        -        -        -
/system.slice/rhsmcertd.service                                                                                          1      -        -        -        -
/system.slice/rsyslog.service                                                                                            1      -        -        -        -
/system.slice/sshd.service                                                                                               1      -        -        -        -
/system.slice/system-getty.slice/getty tty1 service                                                                      1      -        -        -        -
/system.slice/systemd-journald.service                                                                                   1      -        -        -        -
/system.slice/systemd-logind.service                                                                                     1      -        -        -        -
/system.slice/systemd-udevd.service                                                                                      1      -        -        -        -
/system.slice/tuned.service                                                                                              1      -        -        -        -
/user.slice/user-3972.slice/session-15191.scope                                                                          3      -        -        -        -
/user.slice/user-3972.slice/session-16005.scope                                                                          4      -        -        -        -
/user.slice/user-3972.slice/session-16019.scope                                                                         10      -        -        -        -

Thanks by advance for your help!

Regards,

Youssef

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