[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] cpu utilization monitoring
Currently in the vcpu_runstate_info structure we have fields that contain the time spent when the vcpu is in one of four states. When trying to determine the physical utilization that a vcpu is requiring of the system from libxc we make a domctl operation call to the XEN_DOMCTL_getvcpuinfo command. When processing this command we pull the value for the RUNSTATE_running field and attribute it to the processor that the vcpu is currently running on. I believe that with the new credit scheduler these values are wrong as it is possible that the vcpu has time in RUNSTATE_running that was not actually spent on the currently running processor. Is there a separate path through the libraries and into Xen that retrieves this information in a more correct manner? Given that a vcpu can migrate among several physical processors in the time between samples it seems that a finer grained accounting mechanism is needed to correctly report physical utilization of the hardware resources. -- Karl Rister IBM Linux Performance Team kmr@xxxxxxxxxx _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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