thp: documentation: 'transparent_hugepage=' can also be specified on cmdline

The behavior of THP can either be toggled through sysfs in runtime or
using a kernel cmdline parameter 'transparent_hugepage='.  Document the
latter in kernel-parameters.txt

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 8cadb7551fca8d5a199edc7fa9008af07359d499..7986d79d9d17030a73fb6efbe1ae02ddece06342 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2635,6 +2635,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        to facilitate early boot debugging.
                        See also Documentation/trace/events.txt
 
+       transparent_hugepage=
+                       [KNL]
+                       Format: [always|madvise|never]
+                       Can be used to control the default behavior of the system
+                       with respect to transparent hugepages.
+                       See Documentation/vm/transhuge.txt for more details.
+
        tsc=            Disable clocksource stability checks for TSC.
                        Format: <string>
                        [x86] reliable: mark tsc clocksource as reliable, this