ksm: allow trees per NUMA node

[~andy/linux] / Documentation / vm / ksm.txt

diff --git a/Documentation/vm/ksm.txt b/Documentation/vm/ksm.txt
index b392e496f816ac6c77fccd9c0c367de4efa57034..25cc89ba811bb93784fad06669131d71f62e80c4 100644 (file)
--- a/Documentation/vm/ksm.txt
+++ b/Documentation/vm/ksm.txt
@@ -58,6 +58,13 @@ sleep_millisecs  - how many milliseconds ksmd should sleep before next scan
                    e.g. "echo 20 > /sys/kernel/mm/ksm/sleep_millisecs"
                    Default: 20 (chosen for demonstration purposes)
 
+merge_across_nodes - specifies if pages from different numa nodes can be merged.
+                   When set to 0, ksm merges only pages which physically
+                   reside in the memory area of same NUMA node. It brings
+                   lower latency to access to shared page. Value can be
+                   changed only when there is no ksm shared pages in system.
+                   Default: 1
+
 run              - set 0 to stop ksmd from running but keep merged pages,
                    set 1 to run ksmd e.g. "echo 1 > /sys/kernel/mm/ksm/run",
                    set 2 to stop ksmd and unmerge all pages currently merged,