summaryrefslogtreecommitdiffstats
path: root/Documentation
diff options
context:
space:
mode:
authorLiu, Jinsong <jinsong.liu@intel.com>2012-06-11 20:38:08 +0800
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-07-19 15:51:39 -0400
commitf65c9bb3fb725551d3e405f4d092caf24929cebe (patch)
treed68e9715ac73dd431709ddf2301a313105688b68 /Documentation
parent05e36006adc3046f86f2be8652a22d5f77ebd6ea (diff)
downloadop-kernel-dev-f65c9bb3fb725551d3e405f4d092caf24929cebe.zip
op-kernel-dev-f65c9bb3fb725551d3e405f4d092caf24929cebe.tar.gz
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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-devices-system-xen_cpu20
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-xen_cpu b/Documentation/ABI/testing/sysfs-devices-system-xen_cpu
new file mode 100644
index 0000000..9ca02fb
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-devices-system-xen_cpu
@@ -0,0 +1,20 @@
+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.
OpenPOWER on IntegriCloud