Re: [RFC/RFT] [PATCH 08/10] cpufreq: intel_pstate: Dyanmically update busy pct

[Peter Zijlstra]

On Tue, May 15, 2018 at 09:49:09PM -0700, Srinivas Pandruvada wrote:
> +static inline void intel_pstate_update_busy_threshold(struct cpudata *cpu)
> +{
> +	/* P1 percent out of total range of P-states */
> +	if (cpu->pstate.max_freq != cpu->pstate.turbo_freq) {
> +		hwp_boost_pstate_threshold =
> +			cpu->pstate.max_freq * SCHED_CAPACITY_SCALE / cpu->pstate.turbo_freq;
> +		pr_debug("hwp_boost_pstate_threshold = %d\n",
> +			 hwp_boost_pstate_threshold);
> +	}
> +
> +}
> +
>  static inline void intel_pstate_update_util_hwp(struct update_util_data *data,
>  						u64 time, unsigned int flags)
>  {
> @@ -2061,8 +2097,10 @@ static int __intel_pstate_cpu_init(struct cpufreq_policy *policy)
>  
>  	policy->fast_switch_possible = true;
>  
> -	if (hwp_active)
> +	if (hwp_active) {
>  		csd_init(cpu);
> +		intel_pstate_update_busy_threshold(cpu);
> +	}
>  
>  	return 0;
>  }

This should go in patch #5 and then you can remove that SKX hack. Which
you left in, even though you now did it right.