[PATCH V2 2/3] sched/fair: update cpu_capcity to reflect thermal pressure

Thara Gopinath
2019-04-16T19:38:58Z

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.

Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
---
kernel/sched/fair.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 8213ff6..c5454d3 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -23,6 +23,7 @@
#include "sched.h"

#include <trace/events/sched.h>
+#include <linux/sched/thermal.h>

/*
* Targeted preemption latency for CPU-bound tasks:
@@ -7967,6 +7968,9 @@ static void update_cpu_capacity(struct sched_domain *sd, int cpu)
if (!capacity)
capacity = 1;

+ capacity *= sched_get_thermal_pressure(cpu);
+ capacity >>= SCHED_CAPACITY_SHIFT;
+
cpu_rq(cpu)->cpu_capacity = capacity;
sdg->sgc->capacity = capacity;
sdg->sgc->min_capacity = capacity;
--
2.1.4