linux-kernel - [Patch v5 3/6] sched/fair: Enable periodic update of average thermal pressure

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Message-Id: <1572979786-20361-4-git-send-email-thara.gopinath@linaro.org>
Date:   Tue,  5 Nov 2019 13:49:43 -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,
        edubezval@...il.com, qperret@...gle.com
Cc:     linux-kernel@...r.kernel.org, amit.kachhap@...il.com,
        javi.merino@...nel.org, daniel.lezcano@...aro.org
Subject: [Patch v5 3/6] 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>
---

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.

 kernel/sched/fair.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 2e907cc..9fb0494 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -92,6 +92,8 @@ const_debug unsigned int sysctl_sched_migration_cost	= 500000UL;
  */
 static DEFINE_PER_CPU(unsigned long, thermal_pressure);
 
+static void trigger_thermal_pressure_average(struct rq *rq);
+
 #ifdef CONFIG_SMP
 /*
  * For asym packing, by default the lower numbered CPU has higher priority.
@@ -7493,6 +7495,9 @@ 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;
@@ -7580,6 +7585,8 @@ static void update_blocked_averages(int cpu)
 		done = false;
 
 	update_blocked_load_status(rq, !done);
+
+	trigger_thermal_pressure_average(rq);
 	rq_unlock_irqrestore(rq, &rf);
 }
 
@@ -7646,6 +7653,7 @@ static inline void update_blocked_averages(int cpu)
 	update_dl_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &dl_sched_class);
 	update_irq_load_avg(rq, 0);
 	update_blocked_load_status(rq, cfs_rq_has_blocked(cfs_rq) || others_have_blocked(rq));
+	trigger_thermal_pressure_average(rq);
 	rq_unlock_irqrestore(rq, &rf);
 }
 
@@ -9939,6 +9947,8 @@ 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));
+
+	trigger_thermal_pressure_average(rq);
 }
 
 /*
-- 
2.1.4