On 10.04.2013 12:08, Daniel P. Berrange wrote:
> From: "Daniel P. Berrange" <berrange@xxxxxxxxxx>
>
> Historically QEMU/LXC guests have been placed in a cgroup layout
> that is
>
> $LOCATION-OF-LIBVIRTD/libvirt/{qemu,lxc}/$VMNAME
>
> This is bad for a number of reasons
>
> - The cgroup hierarchy gets very deep which seriously
> impacts kernel performance due to cgroups scalability
> limitations.
>
> - It is hard to setup cgroup policies which apply across
> services and virtual machines, since all VMs are underneath
> the libvirtd service.
>
> To address this the default cgroup location is changed to
> be
>
> /system/$VMNAME.{lxc,qemu}.libvirt
>
> This puts virtual machines at the same level in the hierarchy
> as system services, allowing consistent policy to be setup
> across all of them.
>
> This also honours the new resource partition location from the
> XML configuration, for example
>
> <resource>
> <partition>/virtualmachines/production</partitions>
> </resource>
>
> will result in the VM being placed at
>
> /virtualmachines/production/$VMNAME.{lxc,qemu}.libvirt
>
> NB, with the exception of the default, /system, path which
> is intended to always exist, libvirt will not attempt to
> auto-create the partitions in the XML. It is the responsibility
> of the admin/app to configure the partitions. Later libvirt
> APIs will provide a way todo this.
This NB part shall be duplicated to the docs from previous patch.
>
> Signed-off-by: Daniel P. Berrange <berrange@xxxxxxxxxx>
> ---
> src/lxc/lxc_cgroup.c | 91 +++++++++++++++++++++++++++++++-------
> src/lxc/lxc_cgroup.h | 2 +-
> src/lxc/lxc_process.c | 4 +-
> src/qemu/qemu_cgroup.c | 114 +++++++++++++++++++++++++++++++++++++-----------
> src/qemu/qemu_cgroup.h | 3 +-
> src/qemu/qemu_process.c | 2 +-
> 6 files changed, 169 insertions(+), 47 deletions(-)
ACK
Michal
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