Received-SPF: pass (google.com: domain of linux-kernel+bounces-21129-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99;
From: Vincent Guittot <vincent.guittot@linaro.org>
To: linux@armlinux.org.uk,
	catalin.marinas@arm.com,
	will@kernel.org,
	sudeep.holla@arm.com,
	rafael@kernel.org,
	viresh.kumar@linaro.org,
	agross@kernel.org,
	andersson@kernel.org,
	konrad.dybcio@linaro.org,
	mingo@redhat.com,
	peterz@infradead.org,
	juri.lelli@redhat.com,
	dietmar.eggemann@arm.com,
	rostedt@goodmis.org,
	bsegall@google.com,
	mgorman@suse.de,
	bristot@redhat.com,
	vschneid@redhat.com,
	lukasz.luba@arm.com,
	rui.zhang@intel.com,
	mhiramat@kernel.org,
	daniel.lezcano@linaro.org,
	amit.kachhap@gmail.com,
	corbet@lwn.net,
	gregkh@linuxfoundation.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	linux-pm@vger.kernel.org,
	linux-arm-msm@vger.kernel.org,
	linux-trace-kernel@vger.kernel.org,
	linux-doc@vger.kernel.org
Cc: qyousef@layalina.io,
	Vincent Guittot <vincent.guittot@linaro.org>
Subject: [PATCH v4 5/5] sched/pelt: Remove shift of thermal clock
Date: Tue,  9 Jan 2024 17:46:55 +0100
Message-Id: <20240109164655.626085-6-vincent.guittot@linaro.org>
In-Reply-To: <20240109164655.626085-1-vincent.guittot@linaro.org>
References: <20240109164655.626085-1-vincent.guittot@linaro.org>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

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@linaro.org>
---
 .../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 65731b060e3f..2ee15522b15d 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5722,6 +5722,7 @@
 			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 a6f084bdf1c5..c68e47bfd5ae 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5670,7 +5670,7 @@ void scheduler_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 f1c3d600d6d6..d5ba6cdb141c 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);
@@ -9247,7 +9241,7 @@ 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 677d24202eec..6fc6718a1060 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1520,24 +1520,6 @@ 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);
-- 
2.34.1