linux-kernel - [tip: sched/core] sched/pelt: Remove shift of thermal clock

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Message-ID: <171395413392.10875.3951642329310305062.tip-bot2@tip-bot2>
Date: Wed, 24 Apr 2024 10:22:13 -0000
From: "tip-bot2 for Vincent Guittot" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Vincent Guittot <vincent.guittot@...aro.org>,
 Ingo Molnar <mingo@...nel.org>, Lukasz Luba <lukasz.luba@....com>,
 Qais Yousef <qyousef@...alina.io>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/pelt: Remove shift of thermal clock

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

Commit-ID:     97450eb909658573dcacc1063b06d3d08642c0c1
Gitweb:        https://git.kernel.org/tip/97450eb909658573dcacc1063b06d3d08642c0c1
Author:        Vincent Guittot <vincent.guittot@...aro.org>
AuthorDate:    Tue, 26 Mar 2024 10:16:16 +01:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Wed, 24 Apr 2024 12:08:02 +02:00

sched/pelt: Remove shift of thermal clock

The optional shift of the clock used by thermal/hw load avg has been
introduced to handle case where the signal was not always a high frequency
hw signal. Now that cpufreq provides a signal for firmware and
SW pressure, we can remove this exception and always keep this PELT signal
aligned with other signals.
Mark sysctl_sched_migration_cost boot parameter as deprecated

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Tested-by: Lukasz Luba <lukasz.luba@....com>
Reviewed-by: Qais Yousef <qyousef@...alina.io>
Reviewed-by: Lukasz Luba <lukasz.luba@....com>
Link: https://lore.kernel.org/r/20240326091616.3696851-6-vincent.guittot@linaro.org
---
 Documentation/admin-guide/kernel-parameters.txt |  1 +-
 kernel/sched/core.c                             |  2 +-
 kernel/sched/fair.c                             | 10 +--------
 kernel/sched/sched.h                            | 18 +----------------
 4 files changed, 4 insertions(+), 27 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index bb884c1..3f390cc 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5807,6 +5807,7 @@
 			but is useful for debugging and performance tuning.
 
 	sched_thermal_decay_shift=
+			[Deprecated]
 			[KNL, SMP] Set a decay shift for scheduler thermal
 			pressure signal. Thermal pressure signal follows the
 			default decay period of other scheduler pelt
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 67a8302..1a91438 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5680,7 +5680,7 @@ void sched_tick(void)
 
 	update_rq_clock(rq);
 	hw_pressure = arch_scale_hw_pressure(cpu_of(rq));
-	update_hw_load_avg(rq_clock_hw(rq), rq, hw_pressure);
+	update_hw_load_avg(rq_clock_task(rq), rq, hw_pressure);
 	curr->sched_class->task_tick(rq, curr, 0);
 	if (sched_feat(LATENCY_WARN))
 		resched_latency = cpu_resched_latency(rq);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index eef39ae..9eb6357 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -78,15 +78,9 @@ static unsigned int normalized_sysctl_sched_base_slice	= 750000ULL;
 
 const_debug unsigned int sysctl_sched_migration_cost	= 500000UL;
 
-int sched_hw_decay_shift;
 static int __init setup_sched_thermal_decay_shift(char *str)
 {
-	int _shift = 0;
-
-	if (kstrtoint(str, 0, &_shift))
-		pr_warn("Unable to set scheduler thermal pressure decay shift parameter\n");
-
-	sched_hw_decay_shift = clamp(_shift, 0, 10);
+	pr_warn("Ignoring the deprecated sched_thermal_decay_shift= option\n");
 	return 1;
 }
 __setup("sched_thermal_decay_shift=", setup_sched_thermal_decay_shift);
@@ -9367,7 +9361,7 @@ 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_hw_load_avg(rq_clock_hw(rq), rq, hw_pressure) |
+		  update_hw_load_avg(now, rq, hw_pressure) |
 		  update_irq_load_avg(rq, 0);
 
 	if (others_have_blocked(rq))
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 993edb0..cb3792c 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1550,24 +1550,6 @@ static inline u64 rq_clock_task(struct rq *rq)
 	return rq->clock_task;
 }
 
-/**
- * By default the decay is the default pelt decay period.
- * The decay shift can change the decay period in
- * multiples of 32.
- *  Decay shift		Decay period(ms)
- *	0			32
- *	1			64
- *	2			128
- *	3			256
- *	4			512
- */
-extern int sched_hw_decay_shift;
-
-static inline u64 rq_clock_hw(struct rq *rq)
-{
-	return rq_clock_task(rq) >> sched_hw_decay_shift;
-}
-
 static inline void rq_clock_skip_update(struct rq *rq)
 {
 	lockdep_assert_rq_held(rq);