[libvirt PATCH] NEWS: mention cgroups on hosts with systemd bug fix
Signed-off-by: Pavel Hrdina <phrdina(a)redhat.com>
---
NEWS.rst | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/NEWS.rst b/NEWS.rst
index bee49923a5..eac86d8a4e 100644
--- a/NEWS.rst
+++ b/NEWS.rst
@@ -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 distributes the resources proportionally to the cgroup
+ siblings and for the rest we have new sub-cgroup that libvirt can managed
+ directly.
+
+ For more details why this is necessary see
+ `systemd cgroug <https://systemd.io/CGROUP_DELEGATION/>`_ documentation.
+
v7.0.0 (2021-01-15)
===================
--
2.29.2