On Mon, Jun 14, 2010 at 03:28:42PM +0530, Balbir Singh wrote: > On Mon, Jun 14, 2010 at 3:10 PM, Daniel P. Berrange <berrange@xxxxxxxxxx> wrote: > > On Sat, Jun 12, 2010 at 07:23:33AM -0400, Alex Jia wrote: > >> Hey Daniel, > >> The cgroup mechanism have been integrated into libvirt for LXC and QEMU driver, > >> and the LXC driver uses all of cgroup controllers except for net_cls and cpuset, > >> while the QEMU driver only uses the cpu and devices controllers at present. > >> > >> From the user point of view, user can use some virsh commands to control some > >> guest resources: > >> 1. Using 'virsh schedinfo' command to get/set CPU scheduler priority for a guest > > > > QEMU + LXC use the cpu controller 'cpu_shares' tunable > > > >> 2. Using 'virsh vcpuin' command to control guest vcpu affinity > > > > QEMU pins the process directly, doesn't use cgroups. LXC has't > > implemented this yet > > > >> 3. Using 'virsh setmem' command to change memory allocation > >> 4. Using 'virsh setmaxmem' command to change maximum memory limit > > > > QEMU uses balloon driver. LXC uses cgroups memory controller > > > > Not sure if I understand this, but the balloon driver and memory > cgroups are not mutually exclusive. One could use both together and I > would certainly like to see additional commands to support cgroups. > What happens if a guest (like freebsd) does not support ballooning? > Are you suggesting we'll not need cgroups at all with QEMU? No, I was merely describing the current usage. Making use of cgroups to enforce the limit is certainly a desirable RFE for the future. > >> 5. Using 'virsh setvcpus' command to change number of virtual CPUs > > > > QEMU uses cpu hotplug. LXC hasn't implemented this. > > > >> I just make sure the above 1 using CPU scheduler controller, maybe 4 using Memory > >> controller? and maybe 5 using CPU set controller? I am not sure. > >> > > I think we'll some notion of soft limits as well, not sure if they can > be encapsulated using the current set. We need memory shares for > example to encapsulate them. Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :| -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list