This is an update of
https://www.redhat.com/archives/libvir-list/2013-April/msg00352.html
Currently libvirt creates a cgroups hiearchy at
$LOCATION-OF-LIBVIRTD/libvirt/{qemu,lxc}/$GUEST-NAME
eg
/sys/fs/cgroup
├── blkio
│ └── libvirt
│ ├── lxc
│ │ └── busy
│ └── qemu
│ └── vm1
├── cpu,cpuacct
│ ├── libvirt
│ │ ├── lxc
│ │ │ └── busy
│ │ └── qemu
│ │ └── vm1
│ │ ├── emulator
│ │ └── vcpu0
│ └── system
│ ├── abrtd.service
│ ....snip....
│ └── upower.service
├── cpuset
│ └── libvirt
│ ├── lxc
│ │ └── busy
│ └── qemu
│ └── vm1
│ ├── emulator
│ └── vcpu0
├── devices
│ └── libvirt
│ ├── lxc
│ │ └── busy
│ └── qemu
│ └── vm1
├── freezer
│ └── libvirt
│ ├── lxc
│ │ └── busy
│ └── qemu
│ └── vm1
├── memory
│ └── libvirt
│ ├── lxc
│ │ └── busy
│ └── qemu
│ └── vm1
├── net_cls
├── perf_event
This series changes it so that libvirt creates cgroups at
/system/$VMNAME.{qemu,lxc}.libvirt
and allows configuration of the "resource partition" (ie the
"/system" bit) via the XML. So we get a layout like this:
/sys/fs/cgroup
├── blkio
│ └── system
│ ├── demo.lxc.libvirt
│ └── vm1.qemu.libvirt
├── cpu,cpuacct
│ └── system
│ ├── abrtd.service
│ ....snip....
│ ├── demo.lxc.libvirt
│ ....snip....
│ └── vm1.qemu.libvirt
│ ├── emulator
│ └── vcpu0
├── cpuset
│ └── system
│ ├── demo.lxc.libvirt
│ └── vm1.qemu.libvirt
│ ├── emulator
│ └── vcpu0
├── devices
│ └── system
│ ├── demo.lxc.libvirt
│ └── vm1.qemu.libvirt
├── freezer
│ └── system
│ ├── demo.lxc.libvirt
│ └── vm1.qemu.libvirt
├── memory
│ └── system
│ ├── demo.lxc.libvirt
│ └── vm1.qemu.libvirt
├── net_cls
├── perf_event
Flattening out the libvirt created hiearchy has serious
performance wins, due to poor kernel scalability with
deep hierarchies. It also makes it easier to configure
system wide policy for resource usage across system
services and virtual machines / containers, since they
all live at the top level in comon resource partitions.
Changes since v2:
- Merge previously ACKed patches
- Incorporate Gao Feng's changes to LXC cgroup mount setup
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