linux-kernel - Re: [PATCH v4 04/18] PM: EM: Refactor em_pd_get_efficient

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Date:   Mon, 23 Oct 2023 19:39:49 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Lukasz Luba <lukasz.luba@....com>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, rafael@...nel.org
Cc:     dietmar.eggemann@....com, rui.zhang@...el.com,
        amit.kucheria@...durent.com, amit.kachhap@...il.com,
        viresh.kumar@...aro.org, len.brown@...el.com, pavel@....cz,
        mhiramat@...nel.org, qyousef@...alina.io, wvw@...gle.com
Subject: Re: [PATCH v4 04/18] PM: EM: Refactor em_pd_get_efficient_state() to
 be more flexible

On 25/09/2023 10:11, Lukasz Luba wrote:
> The Energy Model (EM) is going to support runtime modification. There
> are going to be 2 EM tables which store information. This patch aims
> to prepare the code to be generic and use one of the tables. The function
> will no longer get a pointer to 'struct em_perf_domain' (the EM) but
> instead a pointer to 'struct em_perf_state' (which is one of the EM's
> tables).
> 
> Prepare em_pd_get_efficient_state() for the upcoming changes and
> make it possible to re-use. Return an index for the best performance
> state for a given EM table. The function arguments that are introduced
> should allow to work on different performance state arrays. The caller of
> em_pd_get_efficient_state() should be able to use the index either
> on the default or the modifiable EM table.
> 
> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> ---

[ ... ]

> @@ -251,7 +253,9 @@ static inline unsigned long em_cpu_energy(struct em_perf_domain *pd,
>   	 * Find the lowest performance state of the Energy Model above the
>   	 * requested frequency.
>   	 */
> -	ps = em_pd_get_efficient_state(pd, freq);
> +	i = em_pd_get_efficient_state(pd->table, pd->nr_perf_states, freq,
> +				      pd->flags);

nitpicking but s/i/state/

Other than that:

Reviewed-by: Daniel Lezcano <daniel.lezcano@...aro.org>


> +	ps = &pd->table[i];
>   
>   	/*
>   	 * The capacity of a CPU in the domain at the performance state (ps)

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