linux-kernel - Re: [PATCH v3 linux-next] cpufreq: ondemand: Calculate gradient of CPU load to early increase frequency

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Message-ID: <CAKohpokKCrvMYWQCRWccDJHbBNO7km5-vP=d3TwhDyU7HGX-YA@mail.gmail.com>
Date:	Fri, 22 Feb 2013 07:26:48 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Stratos Karafotis <stratosk@...aphore.gr>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, cpufreq@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 linux-next] cpufreq: ondemand: Calculate gradient of
 CPU load to early increase frequency

On 21 February 2013 23:09, Stratos Karafotis <stratosk@...aphore.gr> wrote:
> Thanks again. Following V3 with your suggestion.
>
> Regards,
> Stratos
>
> -----------------------8<--------------------------------------------
> Instead of checking only the absolute value of CPU load_freq to increase
> frequency, we detect forthcoming CPU load rise and increase frequency
> earlier.
>
> Every sampling rate, we calculate the gradient of load_freq. If it is
> too steep we assume that the load most probably will go over
> up_threshold in next iteration(s) and we increase frequency immediately.
>
> New tuners are introduced:
> - early_demand: to enable this functionality (disabled by default).
> - grad_up_threshold: over this gradient of load we will increase
> frequency immediately.
>
> Signed-off-by: Stratos Karafotis <stratosk@...aphore.gr>

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
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