[RFC PATCH 12/16 v3] Bias select wakee than waker in WAKE_AFFINE

[Yuyang Du]

In WAKE_AFFINE, we do not simply select idle, but bias wakee than waker
if the cc of the wakee and waker (in this order) is capable of handling
the wakee task

Signed-off-by: Yuyang Du <yuyang.du@xxxxxxxxx>
---
 kernel/sched/fair.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0c188df..d40ec9e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4370,7 +4370,18 @@ static int select_idle_sibling(struct task_struct *p, int target)
 	struct sched_group *sg;
 	int i = task_cpu(p);
 
-	if (idle_cpu(target))
+	/*
+	 * we do not select idle, if the cc of the wakee and
+	 * waker (in this order) is capable of handling the wakee task
+	 */
+	if (sysctl_sched_cc_wakeup_threshold) {
+		if (idle_cpu(i) || cpu_cc_capable(i))
+			return i;
+
+		if (i != target && (idle_cpu(target) || cpu_cc_capable(target)))
+			return target;
+	}
+	else if (idle_cpu(target))
 		return target;
 
 	/*
-- 
1.7.9.5

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