[libvirt PATCH 00/15] RFC: basic CGroup support with qemu:///session
Daniel P. Berrangé
berrange at redhat.com
Tue Apr 7 10:53:40 UTC 2020
On Tue, Apr 07, 2020 at 12:48:26PM +0200, Marc-André Lureau wrote:
> On Tue, Apr 7, 2020 at 10:55 AM Pavel Hrdina <phrdina at redhat.com> wrote:
> > On Mon, Apr 06, 2020 at 11:26:57PM +0200, marcandre.lureau at redhat.com wrote:
> > > From: Marc-André Lureau <marcandre.lureau at redhat.com>
> > >
> > > Hi,
> > >
> > > This is a small series that allows basic QEMU VM CGroup support with
> > > the help of machined --user:
> > > https://github.com/systemd/systemd/pull/15312
> > >
> > > The first few patches are fixes to register dbus and slirp-helper
> > > correctly with the VM cgroup.
> > >
> > > A few changes are done to the machined support, adding session
> > > support, and registering the VM to get a systemd scope cgroup under
> > > user machine.slice.
> > Hi,
> > Before we start with anything I would like to know what is the
> > motivation behind having CGroup support for session VMs?
> My initial motivation was to have a way to group VM processes and kill
> them altogether, because I tend to have a lot of them around after a
> Given that systemd --user is very capable and based on
> I thought that was probably the way to go.
Yes, it makes sense. It also should help us close a feature gap
by enabling many of our resource tuning APIs to now work in session
mode, since we can now use cgroups tuning.
> > From the systemd pull request it looks like you would like to have
> > session VMs under the /sys/fs/cgroup/machine.slice which is completely
> > wrong as we should not mix system and session VMs under the same slice.
> No, it is under user.slice, ex with this series:
> CGroup: /user.slice/user-1000.slice/user at 1000.service
> │ └─machine-qemu\x2delmarco\x2d1\x2dfedora.scope
> │ ├─24714 /usr/bin/swtpm socket --daemon --ctrl
> --tpmstate dir=/home/elmarco/.config/libvirt/qemu/swtpm/053f84e7>
> │ ├─24716 /usr/bin/dbus-daemon
> │ ├─24719
> /home/elmarco/src/libslirp-rs/target/debug/libslirp-helper --fd=27
> │ ├─24722 /usr/bin/qemu-system-x86_64 -name
> guest=fedora,debug-threads=on -S -object
> │ └─emulator
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