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[libvirt] [PATCH v3 00/16]



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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