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NEWS: mention cgroups on hosts with systemd bug fix

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Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
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Pavel Hrdina 2021-02-22 16:08:35 +01:00
parent 87a9d3a6b0
commit 146beb48ce
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NEWS.rst
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@ -71,6 +71,23 @@ v7.1.0 (unreleased)
of relying on ``VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE`` if they need finer
grained control.
* cgroups: Fix how we setup and configure cgroups on hosts with systemd
When libvirt is running on host with systemd we register every VM with
machined which creates the VM root cgroup for us as well. Before this fix
we were directly modifying files in the VM root cgroup which was incorrect
because all the files are managed by systemd. The implication was that any
change done by libvirt to cgroup attributes supported by systemd could be
removed which happens for example by running ``systemctl daemon-reload``.
To fix the issue libvirt now uses DBus calls for some of the cgroup
attributes that distribute the resources proportionally to the cgroup
siblings and for the rest we have a new sub-cgroup that libvirt can
managed directly.
For more details why this is necessary see
`systemd cgroup <https://systemd.io/CGROUP_DELEGATION/>`_ documentation.
v7.0.0 (2021-01-15)
===================