[PATCH v3 10/21] sched/cache: Check local_group only once in update_sg_lb_stats()

[Tim Chen]

There is no need to check the local group twice for both
group_asym_packing and group_smt_balance. Adjust the code
to facilitate future checks for group types (cache-aware
load balancing) as well.

No functional changes are expected.

Suggested-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Co-developed-by: Chen Yu <yu.c.chen@xxxxxxxxx>
Signed-off-by: Chen Yu <yu.c.chen@xxxxxxxxx>
Signed-off-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
---

Notes:
    v2->v3:
    No change.

 kernel/sched/fair.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index bb93cc046d73..b0cf4424d198 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -11109,14 +11109,16 @@ static inline void update_sg_lb_stats(struct lb_env *env,
 
 	sgs->group_weight = group->group_weight;
 
-	/* Check if dst CPU is idle and preferred to this group */
-	if (!local_group && env->idle && sgs->sum_h_nr_running &&
-	    sched_group_asym(env, sgs, group))
-		sgs->group_asym_packing = 1;
-
-	/* Check for loaded SMT group to be balanced to dst CPU */
-	if (!local_group && smt_balance(env, sgs, group))
-		sgs->group_smt_balance = 1;
+	if (!local_group) {
+		/* Check if dst CPU is idle and preferred to this group */
+		if (env->idle && sgs->sum_h_nr_running &&
+		    sched_group_asym(env, sgs, group))
+			sgs->group_asym_packing = 1;
+
+		/* Check for loaded SMT group to be balanced to dst CPU */
+		if (smt_balance(env, sgs, group))
+			sgs->group_smt_balance = 1;
+	}
 
 	sgs->group_type = group_classify(env->sd->imbalance_pct, group, sgs);
 
-- 
2.32.0