linux-kernel - [PATCH 3/3] sched/fair: Introduce scaled capacity awareness in wake_affine

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Date:   Sat,  7 Oct 2017 16:48:34 -0700
From:   Rohit Jain <rohit.k.jain@...cle.com>
To:     linux-kernel@...r.kernel.org, eas-dev@...ts.linaro.org
Cc:     peterz@...radead.org, mingo@...hat.com, joelaf@...gle.com,
        atish.patra@...cle.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, morten.rasmussen@....com
Subject: [PATCH 3/3] sched/fair: Introduce scaled capacity awareness in wake_affine_idle code path

wake_affine_idle returns true if the CPU can run the task. Since it is
ignoring capacity, adding that check there to only return true if the
CPU is full_capacity.

Signed-off-by: Rohit Jain <rohit.k.jain@...cle.com>
---
 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5b1f7b9..f4761f2 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5660,7 +5660,7 @@ static bool
 wake_affine_idle(struct sched_domain *sd, struct task_struct *p,
 		 int this_cpu, int prev_cpu, int sync)
 {
-	if (idle_cpu(this_cpu))
+	if (idle_cpu(this_cpu) && full_capacity(this_cpu))
 		return true;
 
 	if (sync && cpu_rq(this_cpu)->nr_running == 1)
-- 
2.7.4