Re: [PATCH 2/2] thermal: cpufreq_cooling: Reuse effective_cpu_util()

[Quentin Perret]

On Friday 17 Jul 2020 at 11:14:38 (+0100), Quentin Perret wrote:
> On Tuesday 14 Jul 2020 at 12:06:53 (+0530), Viresh Kumar wrote:
> >  /**
> > - * get_load() - get load for a cpu since last updated
> > + * get_load() - get current load for a cpu
> >   * @cpufreq_cdev:	&struct cpufreq_cooling_device for this cpu
> >   * @cpu:	cpu number
> > - * @cpu_idx:	index of the cpu in time_in_idle*
> > + * @cpu_idx:	index of the cpu
> >   *
> > - * Return: The average load of cpu @cpu in percentage since this
> > - * function was last called.
> > + * Return: The current load of cpu @cpu in percentage.
> >   */
> >  static u32 get_load(struct cpufreq_cooling_device *cpufreq_cdev, int cpu,
> >  		    int cpu_idx)
> >  {
> > -	u32 load;
> > -	u64 now, now_idle, delta_time, delta_idle;
> > -	struct time_in_idle *idle_time = &cpufreq_cdev->idle_time[cpu_idx];
> > -
> > -	now_idle = get_cpu_idle_time(cpu, &now, 0);
> > -	delta_idle = now_idle - idle_time->time;
> > -	delta_time = now - idle_time->timestamp;
> > +	unsigned long util = cpu_util_cfs(cpu_rq(cpu));
> > +	unsigned long max = arch_scale_cpu_capacity(cpu);
> 
> Should we subtract the thermal PELT signal from max?

Actually, that or add it the ENERGY_UTIL case in effective_cpu_util() as
this appears to be missing for EAS too ...