From: Dietmar Eggemann <dietmar.eggem...@arm.com>
Skip cpu as a potential src (costliest) in case it has only one task
running and its original capacity is greater than or equal to the
original capacity of the dst cpu.
cc: Ingo Molnar <mi...@redhat.com>
cc: Peter Zijlstra <pet...@infradead.org>
Signed-off-by: Dietmar Eggemann <dietmar.eggem...@arm.com>
---
kernel/sched/fair.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 4849bad..b6e2e92 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7251,6 +7251,10 @@ static struct rq *find_busiest_queue(struct lb_env *env,
};
unsigned long energy = sched_group_energy(&eenv);
+ if (rq->nr_running == 1 && capacity_orig_of(i) >=
+ capacity_orig_of(env->dst_cpu))
+ continue;
+
/*
* We're looking for the minimal cpu efficiency
* min(u_i / e_i), crosswise multiplication leads to
--
1.9.1
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