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authorLiu, Jinsong <jinsong.liu@intel.com>2012-06-11 14:38:08 +0200
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-07-19 21:51:39 +0200
commitf65c9bb3fb725551d3e405f4d092caf24929cebe (patch)
treed68e9715ac73dd431709ddf2301a313105688b68 /Documentation
parentxen/mce: Register native mce handler as vMCE bounce back point (diff)
downloadlinux-f65c9bb3fb725551d3e405f4d092caf24929cebe.tar.xz
linux-f65c9bb3fb725551d3e405f4d092caf24929cebe.zip
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>
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+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.