Documentation: ABI: /sys/devices/system/cpu/cpu#/node

Describe NUMA node symlink created for CPUs when CONFIG_NUMA is set.

Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 968d8ba..a703b9e 100644 (file)
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -62,6 +62,21 @@ Description: CPU topology files that describe kernel limits related to
                See Documentation/cputopology.txt for more information.
 
 
+
+What:          /sys/devices/system/cpu/cpu#/node
+Date:          October 2009
+Contact:       Linux memory management mailing list <linux-mm@kvack.org>
+Description:   Discover NUMA node a CPU belongs to
+
+               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
+
+
 What:          /sys/devices/system/cpu/cpu#/topology/core_id
                /sys/devices/system/cpu/cpu#/topology/core_siblings
                /sys/devices/system/cpu/cpu#/topology/core_siblings_list