From: Frederic Weisbecker <frederic@kernel.org>
To: "Paul E. McKenney" <paulmck@kernel.org>
Cc: rcu@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-team@fb.com, rostedt@goodmis.org,
Yury Norov <yury.norov@gmail.com>
Subject: Re: [PATCH rcu 9/9] rcu: Replace cpumask_weight with cpumask_empty where appropriate
Date: Fri, 11 Feb 2022 16:17:50 +0100 [thread overview]
Message-ID: <20220211151750.GC588079@lothringen> (raw)
In-Reply-To: <20220204230805.4193767-9-paulmck@kernel.org>
On Fri, Feb 04, 2022 at 03:08:05PM -0800, Paul E. McKenney wrote:
> From: Yury Norov <yury.norov@gmail.com>
>
> In some places, RCU code calls cpumask_weight() to check if any bit of a
> given cpumask is set. We can do it more efficiently with cpumask_empty()
> because cpumask_empty() stops traversing the cpumask as soon as it finds
> first set bit, while cpumask_weight() counts all bits unconditionally.
>
> Signed-off-by: Yury Norov <yury.norov@gmail.com>
> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
prev parent reply other threads:[~2022-02-11 15:18 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-04 23:07 [PATCH rcu 0/9] Miscellaneous fixes for v5.18 Paul E. McKenney
2022-02-04 23:07 ` [PATCH rcu 1/9] MAINTAINERS: Add Frederic and Neeraj to their RCU files Paul E. McKenney
2022-02-11 15:15 ` Frederic Weisbecker
2022-02-11 16:40 ` Paul E. McKenney
2022-02-04 23:07 ` [PATCH rcu 2/9] rcu: Fix description of kvfree_rcu() Paul E. McKenney
2022-02-04 23:07 ` [PATCH rcu 3/9] rcu: Add mutex for rcu boost kthread spawning and affinity setting Paul E. McKenney
2022-02-11 14:57 ` Frederic Weisbecker
2022-02-11 15:11 ` Frederic Weisbecker
2022-02-11 15:42 ` Paul E. McKenney
2022-02-11 15:43 ` Frederic Weisbecker
2022-02-04 23:08 ` [PATCH rcu 4/9] rcu: Inline __call_rcu() into call_rcu() Paul E. McKenney
2022-02-04 23:08 ` [PATCH rcu 5/9] kasan: Record work creation stack trace with interrupts enabled Paul E. McKenney
2022-02-04 23:08 ` [PATCH rcu 6/9] rcu: Mark writes to the rcu_segcblist structure's ->flags field Paul E. McKenney
2022-02-04 23:08 ` [PATCH rcu 7/9] rcu: Uninline multi-use function: finish_rcuwait() Paul E. McKenney
2022-02-04 23:08 ` [PATCH rcu 8/9] rcu: Remove __read_mostly annotations from rcu_scheduler_active externs Paul E. McKenney
2022-02-04 23:08 ` [PATCH rcu 9/9] rcu: Replace cpumask_weight with cpumask_empty where appropriate Paul E. McKenney
2022-02-11 15:17 ` Frederic Weisbecker [this message]
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