On Mon, Jun 24, 2013 at 03:27:15PM +0200, Lennart Poettering wrote: > On Sat, 22.06.13 15:19, Andy Lutomirski (l...@amacapital.net) wrote: > > > 1. I put all the entire world into a separate, highly constrained > > cgroup. My real-time code runs outside that cgroup. This seems to > > exactly what slices are for, but I need kernel threads to go in to > > the constrained cgroup. Will systemd support this? > > I am not sure whether the ability to move kernel threads into cgroups > will stay around at all, from the kernel side. Tejun, can you comment > on this?
KVM uses the vhost_net device for accelerating guest network I/O paths. This device creates a new kernel thread on each open(), and that kernel thread is attached to the cgroup associated with the process that open()d the device. If systemd allows for a process to be moved between cgroups, then it must also be capable of moving any associated kernel threads to the new cgroup at the same time. This co-placement of vhost-net threads with the KVM process, is very critical for I/O performance of KVM networking. Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :| _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
