linux-kernel - [Patch v6 4/7] sched/fair: Enable periodic update of average thermal pressure

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Date:   Wed, 11 Dec 2019 23:11:45 -0500
From:   Thara Gopinath <thara.gopinath@...aro.org>
To:     mingo@...hat.com, peterz@...radead.org, ionela.voinescu@....com,
        vincent.guittot@...aro.org, rui.zhang@...el.com,
        qperret@...gle.com, daniel.lezcano@...aro.org,
        viresh.kumar@...aro.org
Cc:     linux-kernel@...r.kernel.org, amit.kachhap@...il.com,
        javi.merino@...nel.org, amit.kucheria@...durent.com
Subject: [Patch v6 4/7] sched/fair: Enable periodic update of average thermal pressure

Introduce support in CFS periodic tick and other bookkeeping apis
to trigger the process of computing average thermal pressure for a
cpu. Also consider avg_thermal.load_avg in others_have_blocked
which allows for decay of pelt signals.

Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
---
 kernel/sched/fair.c | 8 ++++++++
 1 file changed, 8 insertions(+)

v4->v5:
	- Updated both versions of update_blocked_averages to trigger the
	  process of computing average thermal pressure.
	- Updated others_have_blocked to considerd avg_thermal.load_avg.

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 08a233e..e12a375 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7462,6 +7462,9 @@ static inline bool others_have_blocked(struct rq *rq)
 	if (READ_ONCE(rq->avg_dl.util_avg))
 		return true;
 
+	if (READ_ONCE(rq->avg_thermal.load_avg))
+		return true;
+
 #ifdef CONFIG_HAVE_SCHED_AVG_IRQ
 	if (READ_ONCE(rq->avg_irq.util_avg))
 		return true;
@@ -7487,6 +7490,7 @@ static bool __update_blocked_others(struct rq *rq, bool *done)
 {
 	const struct sched_class *curr_class;
 	u64 now = rq_clock_pelt(rq);
+	unsigned long thermal_pressure = arch_scale_thermal_capacity(cpu_of(rq));
 	bool decayed;
 
 	/*
@@ -7497,6 +7501,8 @@ static bool __update_blocked_others(struct rq *rq, bool *done)
 
 	decayed = update_rt_rq_load_avg(now, rq, curr_class == &rt_sched_class) |
 		  update_dl_rq_load_avg(now, rq, curr_class == &dl_sched_class) |
+		  update_thermal_load_avg(rq_clock_task(rq), rq,
+					  thermal_pressure) 			|
 		  update_irq_load_avg(rq, 0);
 
 	if (others_have_blocked(rq))
@@ -10263,6 +10269,7 @@ static void task_tick_fair(struct rq *rq, struct task_struct *curr, int queued)
 {
 	struct cfs_rq *cfs_rq;
 	struct sched_entity *se = &curr->se;
+	unsigned long thermal_pressure = arch_scale_thermal_capacity(cpu_of(rq));
 
 	for_each_sched_entity(se) {
 		cfs_rq = cfs_rq_of(se);
@@ -10274,6 +10281,7 @@ static void task_tick_fair(struct rq *rq, struct task_struct *curr, int queued)
 
 	update_misfit_status(curr, rq);
 	update_overutilized_status(task_rq(curr));
+	update_thermal_load_avg(rq_clock_task(rq), rq, thermal_pressure);
 }
 
 /*
-- 
2.1.4