libvirt/tests/domainsnapshotxml2xmlout/disk_snapshot.xml
Osier Yang 0f8e7ae33a qemu: Support numad
numad is an user-level daemon that monitors NUMA topology and
processes resource consumption to facilitate good NUMA resource
alignment of applications/virtual machines to improve performance
and minimize cost of remote memory latencies. It provides a
pre-placement advisory interface, so significant processes can
be pre-bound to nodes with sufficient available resources.

More details: http://fedoraproject.org/wiki/Features/numad

"numad -w ncpus:memory_amount" is the advisory interface numad
provides currently.

This patch add the support by introducing a new XML attribute
for <vcpu>. e.g.

  <vcpu placement="auto">4</vcpu>
  <vcpu placement="static" cpuset="1-10^6">4</vcpu>

The returned advisory nodeset from numad will be printed
in domain's dumped XML. e.g.
  <vcpu placement="auto" cpuset="1-10^6">4</vcpu>

If placement is "auto", the number of vcpus and the current
memory amount specified in domain XML will be used for numad
command line (numad uses MB for memory amount):
  numad -w $num_of_vcpus:$current_memory_amount / 1024

The advisory nodeset returned from numad will be used to set
domain process CPU affinity then. (e.g. qemuProcessInitCpuAffinity).

If the user specifies both CPU affinity policy (e.g.
(<vcpu cpuset="1-10,^7,^8">4</vcpu>) and placement == "auto"
the specified CPU affinity will be overridden.

Only QEMU/KVM drivers support it now.

See docs update in patch for more details.
2012-03-15 12:24:56 +08:00

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XML

<domainsnapshot>
<name>my snap name</name>
<description>!@#$%^</description>
<state>disk-snapshot</state>
<parent>
<name>earlier_snap</name>
</parent>
<creationTime>1272917631</creationTime>
<disks>
<disk name='hda' snapshot='no'/>
<disk name='hdb' snapshot='no'/>
<disk name='hdc' snapshot='internal'/>
<disk name='hdd' snapshot='external'>
<driver type='qed'/>
<source file='/path/to/generated4'/>
</disk>
<disk name='hde' snapshot='external'>
<driver type='qcow2'/>
<source file='/path/to/new'/>
</disk>
<disk name='hdf' snapshot='external'>
<driver type='qcow2'/>
<source file='/path/to/generated5'/>
</disk>
</disks>
<domain type='qemu'>
<name>QEMUGuest1</name>
<uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
<memory unit='KiB'>219100</memory>
<currentMemory unit='KiB'>219100</currentMemory>
<vcpu placement='static' cpuset='1-4,8-20,525'>1</vcpu>
<os>
<type arch='i686' machine='pc'>hvm</type>
<boot dev='hd'/>
</os>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu</emulator>
<disk type='block' device='disk'>
<source dev='/dev/HostVG/QEMUGuest1'/>
<target dev='hda' bus='ide'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<disk type='block' device='disk'>
<source dev='/dev/HostVG/QEMUGuest2'/>
<target dev='hdb' bus='ide'/>
<address type='drive' controller='0' bus='1' target='0' unit='0'/>
</disk>
<disk type='block' device='disk'>
<source dev='/dev/HostVG/QEMUGuest3'/>
<target dev='hdc' bus='ide'/>
<address type='drive' controller='0' bus='2' target='0' unit='0'/>
</disk>
<disk type='block' device='disk'>
<source dev='/dev/HostVG/QEMUGuest4'/>
<target dev='hdd' bus='ide'/>
<address type='drive' controller='0' bus='3' target='0' unit='0'/>
</disk>
<disk type='block' device='disk'>
<source dev='/dev/HostVG/QEMUGuest5'/>
<target dev='hde' bus='ide'/>
<address type='drive' controller='0' bus='4' target='0' unit='0'/>
</disk>
<disk type='block' device='disk'>
<source dev='/dev/HostVG/QEMUGuest6'/>
<target dev='hdf' bus='ide'/>
<address type='drive' controller='0' bus='5' target='0' unit='0'/>
</disk>
<controller type='usb' index='0'/>
<controller type='ide' index='0'/>
<memballoon model='virtio'/>
</devices>
</domain>
<active>1</active>
</domainsnapshot>