[RFC][PATCH 5/5] Documentation: update ABI and hugetlbpage.txt for per-node files

[Nishanth Aravamudan <nacc@us.ibm.com>]

---
This patch will change if we decide to move the per-node interface to
another location in sysfs.

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>

diff --git a/Documentation/ABI/testing/sysfs-devices-system-node b/Documentation/ABI/testing/sysfs-devices-system-node
index 97d6145..5766902 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-node
+++ b/Documentation/ABI/testing/sysfs-devices-system-node
@@ -57,3 +57,10 @@ Description:
 		NUMA statistics for <node>.
 		NOTE: This file violates the sysfs rules for one value
 		per file.
+
+What:		/sys/devices/system/node/<node>/nr_hugepages
+Date:		April 2008
+Contact:	Nish Aravamudan <nacc@us.ibm.com>
+Description:
+		Interface to allocate (and check) hugepages on <node>.
+		This file will not exist if CONFIG_HUGETLB_PAGE is off.
diff --git a/Documentation/vm/hugetlbpage.txt b/Documentation/vm/hugetlbpage.txt
index 3102b81..b749607 100644
--- a/Documentation/vm/hugetlbpage.txt
+++ b/Documentation/vm/hugetlbpage.txt
@@ -80,6 +80,13 @@ of getting physical contiguous pages is still very high). In either
 case, adminstrators will want to verify the number of hugepages actually
 allocated by checking the sysctl or meminfo.
 
+/sys/devices/system/node/nodeX/nr_hugepages allows for finer-grained
+control of the hugepage pool on NUMA machines. The functionality is the
+same as for nr_hugepages, but the effects are restricted to the node in
+question. Similarly, administrators will want to verify the number of
+hugepages actually allocated or freed by checking the per-node meminfo
+or nr_hugepages file.
+
 /proc/sys/vm/nr_overcommit_hugepages indicates how large the pool of
 hugepages can grow, if more hugepages than /proc/sys/vm/nr_hugepages are
 requested by applications. echo'ing any non-zero value into this file

-- 
Nishanth Aravamudan <nacc@us.ibm.com>
IBM Linux Technology Center

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