From 81ddf56306ca46894baa376c4f58c4a52ce5809d Mon Sep 17 00:00:00 2001 From: Olivier Certner Date: Fri, 9 Feb 2024 19:03:22 +0100 Subject: [PATCH] sched: Simplify sched_lend_user_prio_cond() If 'td_lend_user_pri' has the expected value, there is no need to check the fields that sched_lend_user_prio() modifies, they either are already good or soon will be ('td->td_lend_user_pri' has just been changed by a concurrent update). Reviewed by: kib Approved by: emaste (mentor) MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D44050 (cherry picked from commit aeff15b392e68f5f193fff3bb01728b965cacc3a) Approved by: emaste (mentor) (cherry picked from commit b8b729e23cb91a77f3ca51df5100e2c85dfa7447) Approved by: emaste (mentor) Approved by: re (cperciva) --- sys/kern/sched_4bsd.c | 10 ++-------- sys/kern/sched_ule.c | 10 ++-------- 2 files changed, 4 insertions(+), 16 deletions(-) diff --git a/sys/kern/sched_4bsd.c b/sys/kern/sched_4bsd.c index f0fffeb08e2..ff1e5774640 100644 --- a/sys/kern/sched_4bsd.c +++ b/sys/kern/sched_4bsd.c @@ -981,15 +981,9 @@ void sched_lend_user_prio_cond(struct thread *td, u_char prio) { - if (td->td_lend_user_pri != prio) - goto lend; - if (td->td_user_pri != min(prio, td->td_base_user_pri)) - goto lend; - if (td->td_priority != td->td_user_pri) - goto lend; - return; + if (td->td_lend_user_pri == prio) + return; -lend: thread_lock(td); sched_lend_user_prio(td, prio); thread_unlock(td); diff --git a/sys/kern/sched_ule.c b/sys/kern/sched_ule.c index ee1e0ab0b95..4b99f1c486b 100644 --- a/sys/kern/sched_ule.c +++ b/sys/kern/sched_ule.c @@ -2007,15 +2007,9 @@ void sched_lend_user_prio_cond(struct thread *td, u_char prio) { - if (td->td_lend_user_pri != prio) - goto lend; - if (td->td_user_pri != min(prio, td->td_base_user_pri)) - goto lend; - if (td->td_priority != td->td_user_pri) - goto lend; - return; + if (td->td_lend_user_pri == prio) + return; -lend: thread_lock(td); sched_lend_user_prio(td, prio); thread_unlock(td);