0002-sched-core-add-some-branch-hints-based-on-gcov-analy.patch

From ccf1330dad77ddc2a6d38192fa86f36fc7c24d92 Mon Sep 17 00:00:00 2001
From: Colin Ian King <colin.king@intel.com>
Date: Wed, 1 Feb 2023 11:53:51 +0000
Subject: [PATCH] sched/core: add some branch hints based on gcov analysis

Signed-off-by: Colin Ian King <colin.king@intel.com>
---
 kernel/sched/core.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index f730b6fe94a7..ee0ec4ab7d1c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -533,7 +533,7 @@ void raw_spin_rq_lock_nested(struct rq *rq, int subclass)
 
 	/* Matches synchronize_rcu() in __sched_core_enable() */
 	preempt_disable();
-	if (sched_core_disabled()) {
+	if (likely(sched_core_disabled())) {
 		raw_spin_lock_nested(&rq->__lock, subclass);
 		/* preempt_count *MUST* be > 1 */
 		preempt_enable_no_resched();
@@ -741,7 +741,7 @@ void update_rq_clock(struct rq *rq)
 #endif
 
 	delta = sched_clock_cpu(cpu_of(rq)) - rq->clock;
-	if (delta < 0)
+	if (unlikely(delta < 0))
 		return;
 	rq->clock += delta;
 	update_rq_clock_task(rq, delta);
@@ -5932,7 +5932,7 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
 	struct rq *rq_i;
 	bool need_sync;
 
-	if (!sched_core_enabled(rq))
+	if (likely(!sched_core_enabled(rq)))
 		return __pick_next_task(rq, prev, rf);
 
 	cpu = cpu_of(rq);
@@ -8352,7 +8352,7 @@ SYSCALL_DEFINE0(sched_yield)
 #if !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC)
 int __sched __cond_resched(void)
 {
-	if (should_resched(0)) {
+	if (unlikely(should_resched(0))) {
 		preempt_schedule_common();
 		return 1;
 	}
-- 
2.39.1