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Subject[PATCH 5/5] Documentation: ABI: document /sys/devices/system/cpu/
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Date
This interface has been around for a long time, but hasn't been
officially documented.

Since I wanted to extend the ABI, I figured I would document what
already existed.

Cc: Greg KH <greg@kroah.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Alex Chiang <achiang@hp.com>
---

Documentation/ABI/testing/sysfs-devices-cpu | 42 +++++++++++++++++++++++++++
1 files changed, 42 insertions(+), 0 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-devices-cpu

diff --git a/Documentation/ABI/testing/sysfs-devices-cpu b/Documentation/ABI/testing/sysfs-devices-cpu
new file mode 100644
index 0000000..9070889
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-devices-cpu
@@ -0,0 +1,42 @@
+What: /sys/devices/system/cpu/
+Date: October 2009
+Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description:
+ A collection of CPU attributes, including cache information,
+ topology, and frequency. It also contains a mechanism to
+ logically hotplug CPUs.
+
+ The actual attributes present are architecture and
+ configuration dependent.
+
+
+What: /sys/devices/system/cpu/$cpu/online
+Date: January 2006
+Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description:
+ When CONFIG_HOTPLUG_CPU is enabled, allows the user to
+ discover and change the online state of a CPU. To discover
+ the state:
+
+ cat /sys/devices/system/cpu/$cpu/online
+
+ A value of 0 indicates the CPU is offline. A value of 1
+ indicates it is online. To change the state, echo the
+ desired new state into the file:
+
+ echo [0|1] > /sys/devices/system/cpu/$cpu/online
+
+ For more information, please read Documentation/cpu-hotplug.txt
+
+
+What: /sys/devices/system/cpu/$cpu/node
+Date: October 2009
+Contact: Linux memory management mailing list <linux-mm@kvack.org>
+Description:
+ When CONFIG_NUMA is enabled, a symbolic link that points
+ to the corresponding NUMA node directory.
+
+ For example, the following symlink is created for cpu42
+ in NUMA node 2:
+
+ /sys/devices/system/cpu/cpu42/node2 -> ../../node/node2


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