Re: [libvirt PATCH v3] cgroup/LXC: Do not condition availability of v2 by controllers
Hello.
On Tue, Oct 25, 2022 at 11:33:56AM +0200, Pavel Hrdina <phrdina(a)redhat.com> wrote:
Unfortunately this breaks a lot of things and we cannot use it even
as
workaround. Libvirt code has few assumptions as that's how unified mode
works and when the cgroups v2 backend is enabled for hybrid topology we
assume that cpuacct, devices controllers are enabled.
To be on the same side -- there's no cpuacct and devices on cgroup v2
(regardless of hybrid or unified mode).
But in the case of hybrid topology they are enabled by cgroups v1.
Due
to this change we no longer limit access to devices and cpu accounting
no longer works.
Shouldn't v1 backend still carry that out? (On a higher level -- I
understand that having both backends enabled for the hybrid mode is
what's not working well.)
I'm going to send a patch to revert this one and we need to find
yet
another solution to the issue.
BTW do you have any pointers (a commit) when the hybrid mode could have
become broken for libvirt/lxc? (I estimate from the (lack of) user
reports that it must have worked at the time of libvirt 4.0.)
Thanks,
Michal
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