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Subject[RFCv3 PATCH 47/48] sched: Enable active migration for cpus of lower capacity
Date
Add an extra criteria to need_active_balance() to kick off active load
balance if the source cpu is overutilized and has lower capacity than
the destination cpus.

cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>

Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
---
kernel/sched/fair.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 92fd1d8..1c248f8 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7379,6 +7379,13 @@ static int need_active_balance(struct lb_env *env)
return 1;
}

+ if ((capacity_of(env->src_cpu) < capacity_of(env->dst_cpu)) &&
+ env->src_rq->cfs.h_nr_running == 1 &&
+ cpu_overutilized(env->src_cpu, env->sd) &&
+ !cpu_overutilized(env->dst_cpu, env->sd)) {
+ return 1;
+ }
+
return unlikely(sd->nr_balance_failed > sd->cache_nice_tries+2);
}

--
1.9.1


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