mm: add numa node symlink for memory section in sysfs

Commit c04fc586c (mm: show node to memory section relationship with
symlinks in sysfs) created symlinks from nodes to memory sections, e.g.

/sys/devices/system/node/node1/memory135 -> ../../memory/memory135

If you're examining the memory section though and are wondering what node
it might belong to, you can find it by grovelling around in sysfs, but
it's a little cumbersome.

Add a reverse symlink for each memory section that points back to the
node to which it belongs.

Signed-off-by: Alex Chiang <achiang@hp.com>
Cc: Gary Hade <garyhade@us.ibm.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Greg KH <greg@kroah.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
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>

1 files changed, 13 insertions, 1 deletions

diff --git a/Documentation/ABI/testing/sysfs-devices-memory b/Documentation/ABI/testing/sysfs-devices-memory
index 9fe91c02ee40..bf1627b02a03 100644
--- a/Documentation/ABI/testing/sysfs-devices-memory
+++ b/Documentation/ABI/testing/sysfs-devices-memory
@@ -60,6 +60,19 @@ Description:
 Users:          hotplug memory remove tools
                 https://w3.opensource.ibm.com/projects/powerpc-utils/
 
+
+What:           /sys/devices/system/memoryX/nodeY
+Date:           October 2009
+Contact:        Linux Memory Management 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 symbolic link is created for
+                memory section 9 on node0:
+                /sys/devices/system/memory/memory9/node0 -> ../../node/node0
+
+
 What:           /sys/devices/system/node/nodeX/memoryY
 Date:           September 2008
 Contact:        Gary Hade <garyhade@us.ibm.com>
@@ -70,4 +83,3 @@ Description:
                 memory section directory.  For example, the following symbolic
                 link is created for memory section 9 on node0.
                 /sys/devices/system/node/node0/memory9 -> ../../memory/memory9
-