linux-kernel - Re: [RFC PATCH 3/4] cpufreq: Add Active Stats calls tracking frequency changes

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Message-ID: <20210622093258.lddlznwsndpw5mju@vireshk-i7>
Date:   Tue, 22 Jun 2021 15:02:58 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     linux-kernel@...r.kernel.org, daniel.lezcano@...aro.org,
        linux-pm@...r.kernel.org, amitk@...nel.org, rui.zhang@...el.com,
        dietmar.eggemann@....com, Chris.Redpath@....com,
        Beata.Michalska@....com, rjw@...ysocki.net, amit.kachhap@...il.com
Subject: Re: [RFC PATCH 3/4] cpufreq: Add Active Stats calls tracking
 frequency changes

Not commenting on the idea itself but just the code changes here.

On 22-06-21, 08:59, Lukasz Luba wrote:
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index 802abc925b2a..d79cb9310572 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -14,6 +14,7 @@
>  
>  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>  
> +#include <linux/active_stats.h>
>  #include <linux/cpu.h>
>  #include <linux/cpufreq.h>
>  #include <linux/cpu_cooling.h>
> @@ -387,6 +388,8 @@ static void cpufreq_notify_transition(struct cpufreq_policy *policy,
>  
>  		cpufreq_stats_record_transition(policy, freqs->new);
>  		policy->cur = freqs->new;
> +
> +		active_stats_cpu_freq_change(policy->cpu, freqs->new);
>  	}
>  }
>  
> @@ -2085,6 +2088,8 @@ unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
>  			    policy->cpuinfo.max_freq);
>  	cpufreq_stats_record_transition(policy, freq);
>  
> +	active_stats_cpu_freq_fast_change(policy->cpu, freq);
> +

It would have been better if you would have modified
cpufreq_stats_record_transition() instead, since that is there for
similar kind of stats.

Plus don't you need to record this for all policy->cpus instead of
just policy->cpu ?

-- 
viresh