linux-kernel - Re: [PATCH -next 3/3] cpufreq: conservative: Fix relation when decreasing frequency

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Message-ID: <CAKohpomiG1G2NUScDpzbqTBJAOfNr3PcWe55PoGK8bvY4tCdMw@mail.gmail.com>
Date:	Thu, 28 Feb 2013 11:17:03 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>, cpufreq@...r.kernel.org,
	linux-pm@...r.kernel.org, Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH -next 3/3] cpufreq: conservative: Fix relation when
 decreasing frequency

On 28 February 2013 11:08, Namhyung Kim <namhyung@...nel.org> wrote:
> From: Namhyung Kim <namhyung.kim@....com>
>
> The relation should be CPUFREQ_RELATION_L to find optimal frequency
> when decreasing.
>
> Cc: Viresh Kumar <viresh.kumar@...aro.org>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  drivers/cpufreq/cpufreq_conservative.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
> index dd2fd9094819..0d582811d66c 100644
> --- a/drivers/cpufreq/cpufreq_conservative.c
> +++ b/drivers/cpufreq/cpufreq_conservative.c
> @@ -106,7 +106,7 @@ static void cs_check_cpu(int cpu, unsigned int load)
>                         dbs_info->requested_freq = policy->min;
>
>                 __cpufreq_driver_target(policy, dbs_info->requested_freq,
> -                               CPUFREQ_RELATION_H);
> +                               CPUFREQ_RELATION_L);

Other two patches are fine but really not sure about this one.
When decreasing freq, what do we want:
- lowest frequency at or above target, i.e. >= requested_freq
- highest frequency below or at target, i.e. <= requested_freq

I thought second option was better and so CPUFREQ_RELATION_H
suits more. What made you do this change?
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