linux-kernel - [RFC PATCH 7/9] sched: search SMT before LLC domain

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Date:   Fri, 30 Aug 2019 10:49:42 -0700
From:   subhra mazumdar <subhra.mazumdar@...cle.com>
To:     linux-kernel@...r.kernel.org
Cc:     peterz@...radead.org, mingo@...hat.com, tglx@...utronix.de,
        steven.sistare@...cle.com, dhaval.giani@...cle.com,
        daniel.lezcano@...aro.org, vincent.guittot@...aro.org,
        viresh.kumar@...aro.org, tim.c.chen@...ux.intel.com,
        mgorman@...hsingularity.net, parth@...ux.ibm.com,
        patrick.bellasi@....com
Subject: [RFC PATCH 7/9] sched: search SMT before LLC domain

Search SMT siblings before all CPUs in LLC domain for idle CPU. This helps
in L1 cache locality.
---
 kernel/sched/fair.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 8856503..94dd4a32 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6274,11 +6274,11 @@ static int select_idle_sibling(struct task_struct *p, int prev, int target)
 			return i;
 	}
 
-	i = select_idle_cpu(p, sd, target);
+	i = select_idle_smt(p, target);
 	if ((unsigned)i < nr_cpumask_bits)
 		return i;
 
-	i = select_idle_smt(p, target);
+	i = select_idle_cpu(p, sd, target);
 	if ((unsigned)i < nr_cpumask_bits)
 		return i;
 
-- 
2.9.3