| Message ID | 20240109164655.626085-6-vincent.guittot@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Rework system pressure interface to the scheduler | expand |
On 01/09/24 17:46, Vincent Guittot wrote: > 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> > --- Better without it, yes. Reviewed-by: Qais Yousef <qyousef@layalina.io> > .../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 >
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);
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(-)