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

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

Signed-off-by: Alex Chiang <achiang@hp.com>
Cc: Greg KH <greg@kroah.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Gary Hade <garyhade@us.ibm.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Rientjes <rientjes@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 2aae06f..84a710f 100644 (file)
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -92,6 +92,20 @@ Description: Discover NUMA node a CPU belongs to
                /sys/devices/system/cpu/cpu42/node2 -> ../../node/node2
 
 
+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