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Description of problem:
qemu-ga should report memory statistics. IIUC a memory overcommitment manager (MOM) runs on the host and based on data from hosts and guest and its policy decides to give/take memory from guest via virtio memory ballooning.
right now the data from guest are taken (IIUC) from RHEVM's vdsm which gets populated by RHEVM ovirt-guest-agent.
too many agents :) qemu-ga is dependency of ovirt-guest-agent anyway. qemu-ga should report memory statistics so these data are available out of RHEVM environment. qemu-ga is not RHEVM specific, so it would be nice to have such data in basic qemu-ga.