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



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


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