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The VIR_DOMAIN_STATS_VCPU flag to virDomainListGetStats enables reporting of stats about vCPUs. Currently we only report the cumulative CPU running time and the execution state. This adds reporting of the wait time - time the vCPU wants to run, but the host scheduler has something else running ahead of it. The data is reported per-vCPU eg $ virsh domstats --vcpu demo Domain: 'demo' vcpu.current=4 vcpu.maximum=4 vcpu.0.state=1 vcpu.0.time=1420000000 vcpu.0.wait=18403928 vcpu.1.state=1 vcpu.1.time=130000000 vcpu.1.wait=10612111 vcpu.2.state=1 vcpu.2.time=110000000 vcpu.2.wait=12759501 vcpu.3.state=1 vcpu.3.time=90000000 vcpu.3.wait=21825087 In implementing this I notice our reporting of CPU execute time has very poor granularity, since we are getting it from /proc/$PID/stat. As a future enhancement we should prefer to get CPU execute time from /proc/$PID/schedstat or /proc/$PID/sched (if either exist on the running kernel) Signed-off-by: Daniel P. Berrange <berrange@redhat.com>