What: /sys/devices/system/xen_cpu/ Date: May 2012 Contact: Liu, Jinsong <jinsong.liu@intel.com> Description: A collection of global/individual Xen physical cpu attributes Individual physical cpu attributes are contained in subdirectories named by the Xen's logical cpu number, e.g.: /sys/devices/system/xen_cpu/xen_cpu#/ What: /sys/devices/system/xen_cpu/xen_cpu#/online Date: May 2012 Contact: Liu, Jinsong <jinsong.liu@intel.com> Description: Interface to online/offline Xen physical cpus When running under Xen platform, it provide user interface to online/offline physical cpus, except cpu0 due to several logic restrictions and assumptions.