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 > 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. > > And I wonder how to control devices access via virsh command or libvirt > binding API > such as python binding? in addition, for CPU accounting and Freezer > controller, > how to use them to control guest resource from libvirt application layer? and > how > to check setting result is valid such as cpuacct? these issues let me confuse > at recent. There isn't any direct access to cgroups via any APIs. The use of cgroups is a private implementation details only. You just need to uses the APIs that correspond to those virsh commands 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 [email protected] https://www.redhat.com/mailman/listinfo/libvir-list
