On 12/8/21 04:50, longguang.yue wrote: By parsing /proc/$qemu-pid/task/$vcpu-tid/stat, or for stats of qemu itself just /proc/$qemu-pid/stat. We have an API that we don't like to talk about that parses cgroups: virCgroupGetPercpuStats() and virCgroupGetDomainTotalCpuStats(). What do you mean by non-root mode? Each vcpu is in its own cgroup, main QEMU thread is in emulator/ sub-group, and so is every iothread. There's nothing running in the "root" group. But since you brought it up, maybe it's time for Kata to start looking in libvirt's direction? This is all solved here ;-) Michal