[libvirt] [RFD] API for reporting virtual machine memory statistics

Daniel P. Berrange berrange at redhat.com
Tue Nov 10 15:31:27 UTC 2009

On Tue, Nov 10, 2009 at 09:27:45AM -0600, Adam Litke wrote:
> I am working on a feature that enables virtual machines to report memory
> statistics to the host.  Examples include: free memory, number of pages
> swapped out/in, number of page faults, etc.  This information is useful
> to a virtual machine manager which can use it to make memory ballooning
> or VM migration decisions.  My implementation uses the virtio-balloon
> driver as a conduit for the memory info.
> What is the best way to expose these memory stats in libvirt?  I see two
> possibilities.  The dominfo command already queries the balloon driver
> so I could easily extend this command to report the additional fields.
> The second, and better IMO, option is to introduce a new command
> (dommemstat) with output similar to domblkstat.
> What do you think?

The libvirt API  guarentee requires that we don't make any changes to
the virDomainInfo struct. So adding a new API & virsh dommemstat command
would be the logical way forward

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