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@xxxxxxxxxx>
AuthorDate: Tue, 26 Mar 2024 10:16:16 +01:00
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Tested-by: Lukasz Luba <lukasz.luba@xxxxxxx>
Reviewed-by: Qais Yousef <qyousef@xxxxxxxxxxx>
Reviewed-by: Lukasz Luba <lukasz.luba@xxxxxxx>
Link: https://lore.kernel.org/r/20240326091616.3696851-6-vincent.guittot@xxxxxxxxxx
---
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);
|