linux-kernel - [tip: sched/core] sched/fair: Enable periodic update of average thermal pressure

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Message-ID: <158350572934.28353.12524884079406049060.tip-bot2@tip-bot2>
Date:   Fri, 06 Mar 2020 14:42:09 -0000
From:   "tip-bot2 for Thara Gopinath" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thara Gopinath <thara.gopinath@...aro.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: sched/core] sched/fair: Enable periodic update of average
 thermal pressure

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     b4eccf5f8e1dcade112d97be86ad455a94501a0f
Gitweb:        https://git.kernel.org/tip/b4eccf5f8e1dcade112d97be86ad455a94501a0f
Author:        Thara Gopinath <thara.gopinath@...aro.org>
AuthorDate:    Fri, 21 Feb 2020 19:52:10 -05:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Fri, 06 Mar 2020 12:57:20 +01:00

sched/fair: Enable periodic update of average thermal pressure

Introduce support in scheduler periodic tick and other CFS 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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lkml.kernel.org/r/20200222005213.3873-7-thara.gopinath@linaro.org
---
 kernel/sched/core.c | 3 +++
 kernel/sched/fair.c | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 8e6f380..3e620fe 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3586,6 +3586,7 @@ void scheduler_tick(void)
 	struct rq *rq = cpu_rq(cpu);
 	struct task_struct *curr = rq->curr;
 	struct rq_flags rf;
+	unsigned long thermal_pressure;
 
 	arch_scale_freq_tick();
 	sched_clock_tick();
@@ -3593,6 +3594,8 @@ void scheduler_tick(void)
 	rq_lock(rq, &rf);
 
 	update_rq_clock(rq);
+	thermal_pressure = arch_scale_thermal_pressure(cpu_of(rq));
+	update_thermal_load_avg(rq_clock_task(rq), rq, thermal_pressure);
 	curr->sched_class->task_tick(rq, curr, 0);
 	calc_global_load_tick(rq);
 	psi_task_tick(rq);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 4b5d5e5..11f8488 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7719,6 +7719,9 @@ static inline bool others_have_blocked(struct rq *rq)
 	if (READ_ONCE(rq->avg_dl.util_avg))
 		return true;
 
+	if (thermal_load_avg(rq))
+		return true;
+
 #ifdef CONFIG_HAVE_SCHED_AVG_IRQ
 	if (READ_ONCE(rq->avg_irq.util_avg))
 		return true;
@@ -7744,6 +7747,7 @@ 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;
 	bool decayed;
 
 	/*
@@ -7752,8 +7756,11 @@ static bool __update_blocked_others(struct rq *rq, bool *done)
 	 */
 	curr_class = rq->curr->sched_class;
 
+	thermal_pressure = arch_scale_thermal_pressure(cpu_of(rq));
+
 	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))