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| author | Liu, Jinsong <jinsong.liu@intel.com> | 2012-06-11 20:38:08 +0800 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-07-19 15:51:39 -0400 |
| commit | f65c9bb3fb725551d3e405f4d092caf24929cebe (patch) | |
| tree | d68e9715ac73dd431709ddf2301a313105688b68 /Documentation/ABI/testing/sysfs-devices-system-xen_cpu | |
| parent | 05e36006adc3046f86f2be8652a22d5f77ebd6ea (diff) | |
| download | lwn-f65c9bb3fb725551d3e405f4d092caf24929cebe.tar.gz lwn-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>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-devices-system-xen_cpu')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-system-xen_cpu | 20 |
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 000000000000..9ca02fb2d498 --- /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. |