On Mon, Feb 10, 2014 at 12:29 AM, arnaud gaboury <arnaud.gaboury@xxxxxxxxx> wrote: > Dear list, > > I am building a Arch server on my Arch box. > My tools are QEMU/KVM and libvirt to manage the guest, systemd as > system manager. > > I am looking at implementing the Linux Control Groups facilities for > resource management. Even after long hours of reading, I am not quite > sure about how to deal with the cgroups facilities. > > First, do I really need to care about all that, or libvirt and systemd > will manage the resource in an efficient way right out of the box? > > If not, It's all about /etc/cgconfig.conf and cgrules.conf. I am > honestly not sure : > -what are the correct mount points for cpu, memory etc in the > /sys/fs/cgroup directory . > - which directories am I supposed to mk, if any ? > > Then, Archwiki[1] says: > > # cgcreate -a $USER -g memory,cpu:groupname > > > - what is the groupename I shall create (qemu*, MyMachine) ? > - which $USER shall I use (qemu*, my username) ? > > * qemu:qemu as user:group in /etc/libvirt/qemu.conf > > Thank you for some help as I admit if I understand the cgroups > principle and advantages, I am far from understanding how to create > such a group in case of a VM. > > [1]https://wiki.archlinux.org/index.php/Cgroups After more reading, especially the Fedora Resource Management Guide[1], here is my /etc/cgconfig.conf: group dahlia { perm { # who can manage limits admin { uid = 1000; gid = 1004; } # who can add task task { uid = 1000; gid = 1004; } } # create this group in the controllers cpu { } cpuset { } memory { } devices { } freezer { } net_cls { } blkio { } } * NOTES : 1004 is qemu user ; dahlia is the name of the guest machine ; all dahlia controllers are created and mounted at boot in /sys/fs/cgroup/$CONTROLLER-NAME/dahlia $ systemctl status cgconfig.service returns no errors, so these settings sound OK. But now I am not sure how I can use these settings with libvirt. I have problems understanding well The libvirt Control Groups Resource Management page[2] It is the first time I do such a setup (using cgroups & systemd) for a VM, so thank you for help. [1]http://docs.fedoraproject.org/en-US/Fedora/17/html-single/Resource_Management_Guide/index.html#sec-How_Control_Groups_Are_Organized [2]http://libvirt.org/cgroups.html#legacyLayout _______________________________________________ libvirt-users mailing list libvirt-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
