linux-yocto/Documentation/ABI/testing/sysfs-devices-system-xen_cpu
Liu, Jinsong f65c9bb3fb xen/pcpu: Xen physical cpus online/offline sys interface
This patch provide Xen physical cpus online/offline sys interface.
User can use it for their own purpose, like power saving:
by offlining some cpus when light workload it save power greatly.

Its basic workflow is, user online/offline cpu via sys interface,
then hypercall xen to implement, after done xen inject virq back to dom0,
and then dom0 sync cpu status.

Signed-off-by: Jiang, Yunhong <yunhong.jiang@intel.com>
Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19 15:51:39 -04:00

670 B

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.