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authorAlex Chiang <achiang@hp.com>2009-12-14 20:59:05 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 11:53:17 -0500
commitdee5d0d518defd0337a41f1a504428c9acc87be5 (patch)
treedeb540b5ccc58f0e83114509e17dacb281fc12e5 /Documentation
parentd99be1a8ecf377c2c9b3372d36411ad6547bbd4c (diff)
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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-devices-memory14
-rw-r--r--Documentation/memory-hotplug.txt11
2 files changed, 20 insertions, 5 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:
60Users: hotplug memory remove tools 60Users: hotplug memory remove tools
61 https://w3.opensource.ibm.com/projects/powerpc-utils/ 61 https://w3.opensource.ibm.com/projects/powerpc-utils/
62 62
63
64What: /sys/devices/system/memoryX/nodeY
65Date: October 2009
66Contact: Linux Memory Management list <linux-mm@kvack.org>
67Description:
68 When CONFIG_NUMA is enabled, a symbolic link that
69 points to the corresponding NUMA node directory.
70
71 For example, the following symbolic link is created for
72 memory section 9 on node0:
73 /sys/devices/system/memory/memory9/node0 -> ../../node/node0
74
75
63What: /sys/devices/system/node/nodeX/memoryY 76What: /sys/devices/system/node/nodeX/memoryY
64Date: September 2008 77Date: September 2008
65Contact: Gary Hade <garyhade@us.ibm.com> 78Contact: Gary Hade <garyhade@us.ibm.com>
@@ -70,4 +83,3 @@ Description:
70 memory section directory. For example, the following symbolic 83 memory section directory. For example, the following symbolic
71 link is created for memory section 9 on node0. 84 link is created for memory section 9 on node0.
72 /sys/devices/system/node/node0/memory9 -> ../../memory/memory9 85 /sys/devices/system/node/node0/memory9 -> ../../memory/memory9
73
diff --git a/Documentation/memory-hotplug.txt b/Documentation/memory-hotplug.txt
index bbc8a6a36921..57e7e9cc1870 100644
--- a/Documentation/memory-hotplug.txt
+++ b/Documentation/memory-hotplug.txt
@@ -160,12 +160,15 @@ Under each section, you can see 4 files.
160NOTE: 160NOTE:
161 These directories/files appear after physical memory hotplug phase. 161 These directories/files appear after physical memory hotplug phase.
162 162
163If CONFIG_NUMA is enabled the 163If CONFIG_NUMA is enabled the memoryXXX/ directories can also be accessed
164/sys/devices/system/memory/memoryXXX memory section 164via symbolic links located in the /sys/devices/system/node/node* directories.
165directories can also be accessed via symbolic links located in 165
166the /sys/devices/system/node/node* directories. For example: 166For example:
167/sys/devices/system/node/node0/memory9 -> ../../memory/memory9 167/sys/devices/system/node/node0/memory9 -> ../../memory/memory9
168 168
169A backlink will also be created:
170/sys/devices/system/memory/memory9/node0 -> ../../node/node0
171
169-------------------------------- 172--------------------------------
1704. Physical memory hot-add phase 1734. Physical memory hot-add phase
171-------------------------------- 174--------------------------------