libvirt users - Sep 2015 - Guest cpuacct counters and others location

Hi,

My piece of code ( C langage) uses cgroups to retrieve counters related to cpu
and memory usage related to KVM guests  hosted by the host where this code runs.

I noticed that depending on the O.S. running on  the host , these counters are
not found  at the same location :

CentOS 7 :

ls /sys/fs/cgroup/cpuacct/machine.slice/machine-qemu\\x2drhel6.0.scope/vcpu0
cgroup.clone_children  cgroup.procs  cpuacct.usage         cpu.cfs_period_us 
cpu.rt_period_us   cpu.shares  notify_on_release
cgroup.event_control   cpuacct.stat  cpuacct.usage_percpu  cpu.cfs_quota_us  
cpu.rt_runtime_us  cpu.stat    tasks
]#

RHEL6 :

ls /cgroup/cpuacct/libvirt/qemu/VM_Orion-1/vcpu0
cgroup.event_control  cgroup.procs  cpuacct.stat  cpuacct.usage 
cpuacct.usage_percpu  notify_on_release  tasks



1)      May I assume that their meanings is identical ?

2)      Is this difference due to the O.S. or to libvirt ?

3)      I presume I've to check this point on Ubuntu , Debian and Fedora .

Thanks

J.P. Ribeauville


P: +33.(0).1.47.17.20.49
.
Puteaux 3 Etage 5  Bureau 4

jpribeauville@axway.com<mailto:jpribeauville@axway.com>
http://www.axway.com<http://www.axway.com/>



P Pensez à l'environnement avant d'imprimer.

On Thu, Sep 24, 2015 at 07:43:25PM +0000, Jean-Pierre Ribeauville
wrote:
>
>Hi,
>
>My piece of code ( C langage) uses cgroups to retrieve counters related to
cpu and memory usage related to KVM guests  hosted by the host where this code
runs.
>
>I noticed that depending on the O.S. running on  the host , these counters
are not found  at the same location :
>
>CentOS 7 :
>
>ls /sys/fs/cgroup/cpuacct/machine.slice/machine-qemu\\x2drhel6.0.scope/vcpu0
>cgroup.clone_children  cgroup.procs  cpuacct.usage         cpu.cfs_period_us
cpu.rt_period_us   cpu.shares  notify_on_release
>cgroup.event_control   cpuacct.stat  cpuacct.usage_percpu  cpu.cfs_quota_us 
cpu.rt_runtime_us  cpu.stat    tasks
>]#
>
>RHEL6 :
>
>ls /cgroup/cpuacct/libvirt/qemu/VM_Orion-1/vcpu0
>cgroup.event_control  cgroup.procs  cpuacct.stat  cpuacct.usage 
cpuacct.usage_percpu  notify_on_release  tasks
>
>
>
>1)      May I assume that their meanings is identical ?
>
Yes (although each is for different domain)
>2)      Is this difference due to the O.S. or to libvirt ?
>
systemd
>3)      I presume I've to check this point on Ubuntu , Debian and Fedora
.
>
depends on whether it's using systemd or not and maybe other factors
as well.  If you have the PID of the domain, though, you can get the
base directory from /proc/$PID/cgroup and start from there and then
you don't need to check each system.
>Thanks
>
>J.P. Ribeauville
>
>
>P: +33.(0).1.47.17.20.49
>.
>Puteaux 3 Etage 5  Bureau 4
>
>jpribeauville@axway.com<mailto:jpribeauville@axway.com>
>http://www.axway.com<http://www.axway.com/>
>
>
>
>P Pensez à l'environnement avant d'imprimer.
>
>
>
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