git: c31580080e05 - main - Microoptimize rangelock_unlock_int()

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=c31580080e055573a32d886b1ea83bebd9ef4e77

commit c31580080e055573a32d886b1ea83bebd9ef4e77
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2023-10-04 18:55:49 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2024-08-06 04:05:58 +0000

    Microoptimize rangelock_unlock_int()
    
    Only broadcast if there are sleepers.
    
    Suggested by:   markj
    Reviewed by:    markj, Olivier Certner <olce.freebsd@certner.fr>
    Tested by:      pho
    Sponsored by:   The FreeBSD Foundation
    Differential revision:  https://reviews.freebsd.org/D41787
---
 sys/kern/kern_rangelock.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sys/kern/kern_rangelock.c b/sys/kern/kern_rangelock.c
index 9c6b7fb871f9..355b2125dd9b 100644
--- a/sys/kern/kern_rangelock.c
+++ b/sys/kern/kern_rangelock.c
@@ -160,13 +160,17 @@ rl_e_is_rlock(const struct rl_q_entry *e)
 static void
 rangelock_unlock_int(struct rangelock *lock, struct rl_q_entry *e)
 {
+	bool sleepers;
+
 	MPASS(lock != NULL && e != NULL);
 	MPASS(!rl_e_is_marked(rl_q_load(&e->rl_q_next)));
 	MPASS(e->rl_q_owner == curthread);
 
 	rl_e_mark(e);
+	sleepers = lock->sleepers;
 	lock->sleepers = false;
-	sleepq_broadcast(&lock->sleepers, SLEEPQ_SLEEP, 0, 0);
+	if (sleepers)
+		sleepq_broadcast(&lock->sleepers, SLEEPQ_SLEEP, 0, 0);
 }
 
 void