linux-kernel - [PATCH rcu 0/2] RCU tasks updates, possibly for v5.18

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Date:   Fri, 4 Feb 2022 16:21:13 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        rostedt@...dmis.org
Subject: [PATCH rcu 0/2] RCU tasks updates, possibly for v5.18

Hello!

This series provides a couple of updates to the RCU Tasks flavors.

1.	rcu-tasks: Use order_base_2() instead of ilog2().
	This spreads CPUs over queues more evenly.

2.	rcu-tasks: Set ->percpu_enqueue_shift to zero upon contention.
	The current mainline series reduces contention by at most a
	factor of two.	This patch gains at least another factor of
	eight during times of high update-side traffic.

						Thanx, Paul

------------------------------------------------------------------------

 b/kernel/rcu/tasks.h |    6 +++---
 kernel/rcu/tasks.h   |    2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)