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Re: [libvirt] [PATCH v3 00/16]



On 2013/04/10 18:08, Daniel P. Berrange wrote:
> 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
> 

I will review this patchset and do some simple test in this week.

Thanks for your great work :)


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