[Patch v5 4/6] sched/fair: update cpu_capcity to reflect thermal pressure

[Thara Gopinath]

cpu_capacity relflects the maximum available capacity of a cpu. Thermal
pressure on a cpu means this maximum available capacity is reduced. This
patch reduces the average thermal pressure for a cpu from its maximum
available capacity so that cpu_capacity reflects the actual
available capacity.

Other signals that are deducted from cpu_capacity to reflect the actual
capacity available are rt and dl util_avg. util_avg tracks a binary signal
and uses the weights 1024 and 0. Whereas thermal pressure is tracked
using load_avg. load_avg uses the actual "delta" capacity as the weight.

Signed-off-by: Thara Gopinath <thara.gopinath@xxxxxxxxxx>
---
 kernel/sched/fair.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 9fb0494..5f6c371 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7738,6 +7738,7 @@ static unsigned long scale_rt_capacity(struct sched_domain *sd, int cpu)
 
 	used = READ_ONCE(rq->avg_rt.util_avg);
 	used += READ_ONCE(rq->avg_dl.util_avg);
+	used += READ_ONCE(rq->avg_thermal.load_avg);
 
 	if (unlikely(used >= max))
 		return 1;
-- 
2.1.4