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From 28e38963fbe539c9804d9132aa3613ead32ee330 Mon Sep 17 00:00:00 2001
From: Brendan Jackman <brendan.jackman@arm.com>
Date: Wed, 15 Feb 2017 17:17:26 +0000
Subject: [PATCH 81/92] SPLIT: sched/fair: Don't load balance from group_other
to groups without spare capacity
This is split out from 885677858fd "sched: Consider misfit tasks when
load-balancing" from lsk-4.4-armlt. The rest of that patch will follow, this is
separated for ease of examination and discussion.
(cherry picked from commit a3e504284acbf3dd12ceec8ebcabaee1892f876e)
Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com>
---
kernel/sched/fair.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index fea3ca8..cf60d93 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7750,6 +7750,14 @@ static bool update_sd_pick_busiest(struct lb_env *env,
if (sgs->group_type < busiest->group_type)
return false;
+ /*
+ * Candidate sg doesn't face any serious load-balance problems
+ * so don't pick it if the local sg is already filled up.
+ */
+ if (sgs->group_type == group_other &&
+ !group_has_capacity(env, &sds->local_stat))
+ return false;
+
if (sgs->avg_load <= busiest->avg_load)
return false;
--
1.9.1
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