From: "Uladzislau Rezki (Sony)" <urezki@gmail.com>
To: "Paul E . McKenney" <paulmck@kernel.org>
Cc: RCU <rcu@vger.kernel.org>,
Neeraj upadhyay <Neeraj.Upadhyay@amd.com>,
Boqun Feng <boqun.feng@gmail.com>,
Hillf Danton <hdanton@sina.com>,
Joel Fernandes <joel@joelfernandes.org>,
LKML <linux-kernel@vger.kernel.org>,
Uladzislau Rezki <urezki@gmail.com>,
Oleksiy Avramchenko <oleksiy.avramchenko@sony.com>,
Frederic Weisbecker <frederic@kernel.org>
Subject: [PATCH v2 3/3] doc: Add rcutree.rcu_normal_wake_from_gp to kernel-parameters.txt
Date: Mon, 30 Oct 2023 14:12:54 +0100 [thread overview]
Message-ID: <20231030131254.488186-4-urezki@gmail.com> (raw)
In-Reply-To: <20231030131254.488186-1-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 03a4bdb7512b..a9681d2492d3 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5009,6 +5009,20 @@
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().
--
2.30.2
next prev parent reply other threads:[~2023-10-30 13:13 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-30 13:12 [PATCH v2 0/3] reduce latency of normal synchronize_rcu() v2 Uladzislau Rezki (Sony)
2023-10-30 13:12 ` [PATCH v2 1/3] rcu: Reduce synchronize_rcu() latency Uladzislau Rezki (Sony)
2023-11-02 4:35 ` Paul E. McKenney
2023-11-06 12:04 ` Uladzislau Rezki
2023-11-07 5:32 ` Paul E. McKenney
2023-11-07 14:21 ` Uladzislau Rezki
2023-11-07 16:49 ` Paul E. McKenney
2023-11-08 10:56 ` Uladzislau Rezki
2023-11-08 15:24 ` Paul E. McKenney
2023-11-09 11:36 ` Z qiang
2023-11-09 12:34 ` Uladzislau Rezki
2023-10-30 13:12 ` [PATCH v2 2/3] rcu: Add a trace event for synchronize_rcu_normal() Uladzislau Rezki (Sony)
2023-11-02 4:36 ` Paul E. McKenney
2023-10-30 13:12 ` Uladzislau Rezki (Sony) [this message]
2023-11-02 4:37 ` [PATCH v2 3/3] doc: Add rcutree.rcu_normal_wake_from_gp to kernel-parameters.txt Paul E. McKenney
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