[PATCH v3 3/7] doc: Add rcutree.rcu_normal_wake_from_gp to kernel-parameters.txt

["Uladzislau Rezki (Sony)" <urezki@gmail.com>]

This commit adds rcutree.rcu_normal_wake_from_gp description
to the kernel-parameters.txt file.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
---
 Documentation/admin-guide/kernel-parameters.txt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 0a1731a0f0ef..65bfbfb09522 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4944,6 +4944,20 @@
 			this kernel boot parameter, forcibly setting it
 			to zero.
 
+	rcutree.rcu_normal_wake_from_gp= [KNL]
+			Reduces a latency of synchronize_rcu() call. This approach
+			maintains its own track of synchronize_rcu() callers, so it
+			does not interact with regular callbacks because it does not
+			use a call_rcu[_hurry]() path. Please note, this is for a
+			normal grace period.
+
+			How to enable it:
+
+			echo 1 > /sys/module/rcutree/parameters/rcu_normal_wake_from_gp
+			or pass a boot parameter "rcutree.rcu_normal_wake_from_gp=1"
+
+			Default is 0.
+
 	rcuscale.gp_async= [KNL]
 			Measure performance of asynchronous
 			grace-period primitives such as call_rcu().
-- 
2.39.2