[PATCH v4 1/5] cpufreq: Add a cpufreq pressure feedback for the scheduler

[Vincent Guittot]

On Tue, 9 Jan 2024 at 17:49, Rafael J. Wysocki <rafael at kernel.org> wrote:
>
> On Tue, Jan 9, 2024 at 5:47 PM Vincent Guittot
> <vincent.guittot at linaro.org> wrote:
> >
> > Provide to the scheduler a feedback about the temporary max available
> > capacity. Unlike arch_update_thermal_pressure, this doesn't need to be
> > filtered as the pressure will happen for dozens ms or more.
> >
> > Signed-off-by: Vincent Guittot <vincent.guittot at linaro.org>
>
> Acked-by: Rafael J. Wysocki <rafael at kernel.org>
>
> and I think I've given the tag on this patch already.

yes, I preferred to not add it after the crap that I did in the v3
with the cleanup of this [1/5] patch

Thanks

>
> > ---
> >  drivers/cpufreq/cpufreq.c | 36 ++++++++++++++++++++++++++++++++++++
> >  include/linux/cpufreq.h   | 10 ++++++++++
> >  2 files changed, 46 insertions(+)
> >
> > diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> > index 44db4f59c4cc..f4eee3d107f1 100644
> > --- a/drivers/cpufreq/cpufreq.c
> > +++ b/drivers/cpufreq/cpufreq.c
> > @@ -2563,6 +2563,40 @@ int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu)
> >  }
> >  EXPORT_SYMBOL(cpufreq_get_policy);
> >
> > +DEFINE_PER_CPU(unsigned long, cpufreq_pressure);
> > +
> > +/**
> > + * cpufreq_update_pressure() - Update cpufreq pressure for CPUs
> > + * @policy: cpufreq policy of the CPUs.
> > + *
> > + * Update the value of cpufreq pressure for all @cpus in the policy.
> > + */
> > +static void cpufreq_update_pressure(struct cpufreq_policy *policy)
> > +{
> > +       unsigned long max_capacity, capped_freq, pressure;
> > +       u32 max_freq;
> > +       int cpu;
> > +
> > +       cpu = cpumask_first(policy->related_cpus);
> > +       max_freq = arch_scale_freq_ref(cpu);
> > +       capped_freq = policy->max;
> > +
> > +       /*
> > +        * Handle properly the boost frequencies, which should simply clean
> > +        * the cpufreq pressure value.
> > +        */
> > +       if (max_freq <= capped_freq) {
> > +               pressure = 0;
> > +       } else {
> > +               max_capacity = arch_scale_cpu_capacity(cpu);
> > +               pressure = max_capacity -
> > +                          mult_frac(max_capacity, capped_freq, max_freq);
> > +       }
> > +
> > +       for_each_cpu(cpu, policy->related_cpus)
> > +               WRITE_ONCE(per_cpu(cpufreq_pressure, cpu), pressure);
> > +}
> > +
> >  /**
> >   * cpufreq_set_policy - Modify cpufreq policy parameters.
> >   * @policy: Policy object to modify.
> > @@ -2618,6 +2652,8 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
> >         policy->max = __resolve_freq(policy, policy->max, CPUFREQ_RELATION_H);
> >         trace_cpu_frequency_limits(policy);
> >
> > +       cpufreq_update_pressure(policy);
> > +
> >         policy->cached_target_freq = UINT_MAX;
> >
> >         pr_debug("new min and max freqs are %u - %u kHz\n",
> > diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
> > index afda5f24d3dd..b1d97edd3253 100644
> > --- a/include/linux/cpufreq.h
> > +++ b/include/linux/cpufreq.h
> > @@ -241,6 +241,12 @@ struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
> >  void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
> >  void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
> >  bool has_target_index(void);
> > +
> > +DECLARE_PER_CPU(unsigned long, cpufreq_pressure);
> > +static inline unsigned long cpufreq_get_pressure(int cpu)
> > +{
> > +       return per_cpu(cpufreq_pressure, cpu);
> > +}
> >  #else
> >  static inline unsigned int cpufreq_get(unsigned int cpu)
> >  {
> > @@ -263,6 +269,10 @@ static inline bool cpufreq_supports_freq_invariance(void)
> >         return false;
> >  }
> >  static inline void disable_cpufreq(void) { }
> > +static inline unsigned long cpufreq_get_pressure(int cpu)
> > +{
> > +       return 0;
> > +}
> >  #endif
> >
> >  #ifdef CONFIG_CPU_FREQ_STAT
> > --
> > 2.34.1
> >