mirror of
https://github.com/torvalds/linux.git
synced 2024-12-04 18:13:04 +00:00
f65c9bb3fb
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>
21 lines
670 B
Plaintext
21 lines
670 B
Plaintext
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.
|