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Microoptimize rangelock_unlock_int()

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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
This commit is contained in:
Konstantin Belousov 2023-10-04 21:55:49 +03:00
parent 5badbeeaf0
commit c31580080e
1 changed files with 5 additions and 1 deletions
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6
sys/kern/kern_rangelock.c
View file

@ -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