[libvirt] [RFC] cgroup settings and systemd daemon-reload conflict

[Nikolay Shirokovskiy]

ping

On 30.01.2018 10:34, Nikolay Shirokovskiy wrote:
> Hi, all.
> 
> It turns out that systemd daemon-reload reset settings that are managable
> thru 'systemctl set-property' interface.
> 
>> virsh schedinfo tst3  | grep global_quota
> global_quota   : -1
>> virsh schedinfo tst3 --set global_quota=50000 | grep global_quota
> global_quota   : 50000
>> systemctl daemon-reload
>> virsh schedinfo tst3  | grep global_quota
> global_quota   : -1
> 
> This behaviour does not limited to cpu controller, same for blkio for example.
> I checked different versions of systemd (219 - Feb 15, and quite recent 236 - Dec 17)
> to make sure it is not kind of bug of old version. So systemd does not play well
> with direct writes to cgroup parameters that managable thru systemd. Looks like
> libvirtd needs to use systemd's dbus interface to change all such parameters.
> 
> I only wonder how this can be unnoticed for such long time (creating cgroup for domain
> thru systemd - Jul 2013) as daemon-reload is called upon libvirtd package update. May
> be I miss something?
> 
> Nikolay
> 
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