[PATCH] Documentation/sysctl: Add timer_migration to kernel.rst

[Phil Auld]

There is no mention of timer_migration in the docs. Add
a short description.

Signed-off-by: Phil Auld <pauld@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: linux-doc@xxxxxxxxxxxxxxx
---
 Documentation/admin-guide/sysctl/kernel.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
index b2b36d0c3094..e03691e2cf4a 100644
--- a/Documentation/admin-guide/sysctl/kernel.rst
+++ b/Documentation/admin-guide/sysctl/kernel.rst
@@ -1544,6 +1544,13 @@ constant ``FUTEX_TID_MASK`` (0x3fffffff).
 If a value outside of this range is written to ``threads-max`` an
 ``EINVAL`` error occurs.
 
+timer_migration
+===============
+
+When set, attempt to migrate timers away from idle cpus to allow them to remain
+in low power states longer.
+
+Default is set.
 
 traceoff_on_warning
 ===================
-- 
2.47.1