On 11/06/21 08:57, Christian Borntraeger wrote:

On 03.06.21 23:14, Jing Zhang wrote:

quoted

This patchset provides a file descriptor for every VM and VCPU to read
KVM statistics data in binary format.
It is meant to provide a lightweight, flexible, scalable and efficient
lock-free solution for user space telemetry applications to pull the
statistics data periodically for large scale systems. The pulling
frequency could be as high as a few times per second.
In this patchset, every statistics data are treated to have some
attributes as below:
   * architecture dependent or generic
   * VM statistics data or VCPU statistics data

Are the debugfs things good enough, or do we want to also add the same
ioctl for the /dev/kvm to get the global counters as well, e.g. for
tools like kvm_stat?

I think we should, yes.  We should also add the summarized VCPU 
statistics to the VM-level file descriptor.  However, it can be done in 
steps.

Paolo