[libvirt-users] memoryStats question

[Eric Blake]

On 07/03/2014 08:29 AM, Gleb Voronich wrote:
>> Eric Blake <mailto:eblake at redhat.com>
>> >
>> > In the case of the memory balloon device, libvirt CAN provide stats from
>> > the guest, because of the way the balloon device works. But if you
>> > aren't using a balloon, or if the guest is not cooperative, this won't
>> > work. Better would be a guest-agent command for getting at this
>> > information (but again, you are relying on guest cooperation). In
>> > short, libvirt is great at stats from the HOST point of view, but for
>> > stats from the GUEST point of view, you are often better off using the
>> > same mechanisms that you would for getting stats from a remote bare
>> > metal machine, without needing libvirt in the mix.
>>
>> Thanks Eric.
>>
>> 1. I use the balloon for all of my guests:
>>      <memballoon model='virtio'>
>>      But how can I get stats?

virDomainMemoryStats() gets those stats, if qemu is new enough to
provide them, and if the guest cooperates to provide them.

>>
>> 2. I've tried the latest QEMU GA 2.0.0

Right now, there are no memory stats available through the guest agent,
only through the balloon device.


-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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