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

Message ID 20231025140915.590390-4-urezki@gmail.com
State New
Headers
Series reduce latency of synchronize_rcu() |

Commit Message

Uladzislau Rezki Oct. 25, 2023, 2:09 p.m. UTC 
  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 | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 03a4bdb7512b..f41bcf17ff58 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5009,6 +5009,18 @@ 
 			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, the rcu_normal_wake_from_gp parameter takes effect
+			if the rcupdate.rcu_normal is active also.
+
+			Faster version is preferred set to 1.
+			Default is 0.
+
 	rcuscale.gp_async= [KNL]
 			Measure performance of asynchronous
 			grace-period primitives such as call_rcu().