From: Shrikanth Hegde <sshegde@linux.ibm.com>
Date: Thu, 15 Jan 2026 07:35:23 +0000 (+0530)
Subject: sched/fair: Change likelyhood of nohz.nr_cpus
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=94e70734b4d034b9df795bd1ad3452ea96e742ca;p=thirdparty%2Fkernel%2Flinux.git

sched/fair: Change likelyhood of nohz.nr_cpus

These days most of the system have multi cores. The likelyhood of
at least one or more CPUs in nohz (idle state) is higher.

Give accurate hint to the branch predictor.

Reviewed-and-tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://patch.msgid.link/20260115073524.376643-3-sshegde@linux.ibm.com
---

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 9afe0c69a3c11..4ae06ce4a9168 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -12459,9 +12459,9 @@ static void nohz_balancer_kick(struct rq *rq)
 
 	/*
 	 * None are in tickless mode and hence no need for NOHZ idle load
-	 * balancing:
+	 * balancing
 	 */
-	if (likely(!atomic_read(&nohz.nr_cpus)))
+	if (unlikely(!atomic_read(&nohz.nr_cpus)))
 		return;
 
 	if (rq->nr_running >= 2) {