linux-kernel - Re: [PATCH v4 1/7] topology: add a new arch_scale_freq

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Message-ID: <ZTuDW8lXZLQP1Ruq@gmail.com>
Date:   Fri, 27 Oct 2023 11:31:07 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     linux@...linux.org.uk, catalin.marinas@....com, will@...nel.org,
        paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, sudeep.holla@....com,
        gregkh@...uxfoundation.org, rafael@...nel.org, mingo@...hat.com,
        peterz@...radead.org, juri.lelli@...hat.com,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        viresh.kumar@...aro.org, lenb@...nel.org, robert.moore@...el.com,
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        pierre.gondois@....com, linux-arm-kernel@...ts.infradead.org,
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Subject: Re: [PATCH v4 1/7] topology: add a new arch_scale_freq_reference


* Vincent Guittot <vincent.guittot@...aro.org> wrote:

> --- a/include/linux/arch_topology.h
> +++ b/include/linux/arch_topology.h
> @@ -27,6 +27,13 @@ static inline unsigned long topology_get_cpu_scale(int cpu)
>  
>  void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity);
>  
> +DECLARE_PER_CPU(unsigned long, capacity_ref_freq);
> +
> +static inline unsigned long topology_get_freq_ref(int cpu)
> +{
> +	return per_cpu(capacity_ref_freq, cpu);
> +}
> +
>  DECLARE_PER_CPU(unsigned long, arch_freq_scale);

So mind naming it in a way that expresses that this is indeed a maximum 
frequency? arch_scale_ref_freq_max or so?

Also, is there any particular concept behind naming one new symbol 
'freq_ref', the other 'ref_freq'? If not then please standardize on one 
variant.

Thanks,

	Ingo