[libvirt-users] How to retrieve legacy cgroups location ?

[Martin Kletzander]

On Thu, Oct 29, 2015 at 10:40:44AM +0000, Jean-Pierre Ribeauville wrote:
>Hi,
>
>As told in "Control Groups Resource Management" libvirt page :
>Legacy cgroups layout
>Prior to libvirt 1.0.5, the cgroups layout created by libvirt was different from that described above, and did not allow for administrator customization. Libvirt used a fixed, 3-level hierarchy libvirt/{qemu,lxc}/$VMNAME which was rooted at the point in the hierarchy where libvirtd itself was located. So if libvirtd was placed at /system/libvirtd.service by systemd, the groups for each virtual machine / container would be located at /system/libvirtd.service/libvirt/{qemu,lxc}/$VMNAME. In addition to this, the QEMU drivers further child groups for each vCPU thread and the emulator thread(s). This leads to a hierarchy that looked like

I just skimmed through the question, but wouldn't reading
'/proc/$(pidof libvirtd)/cgroup' or cat /proc/$QEMU_PID/cgroup be
enough?

>I'm trying to retrieve this layout :
>
>$ROOT
>  |
>  +- system
>      |
>      +- libvirtd.service
>           |
>           +- libvirt
>               |
>               +- qemu
>               |   |
>               |   +- vm1
>               |   |   |
>               |   |   +- emulator
>               |   |   +- vcpu0
>               |   |   +- vcpu1
>               |   |
>               |   +- vm2
>               |   |   |
>               |   |   +- emulator
>               |   |   +- vcpu0
>               |   |   +- vcpu1
>               |   |
>               |   +- vm3
>               |       |
>               |       +- emulator
>               |       +- vcpu0
>               |       +- vcpu1
>
>
>How may I find where systemd has placed libvirtd ?
>
>I use libvirt 0.10.2 on a RHEL6 2.6.32-431.el6.x86_64
>
>
>Thx for help.
>
>J.P. Ribeauville
>
>
>P: +33.(0).1.47.17.20.49
>.
>Puteaux 3 Etage 5  Bureau 4
>
>jpribeauville at axway.com<mailto:jpribeauville at axway.com>
>http://www.axway.com<http://www.axway.com/>
>
>
>
>P Pensez à l'environnement avant d'imprimer.
>
>
>

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