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

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Date:	Fri, 22 Feb 2013 13:47:56 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Stratos Karafotis <stratosk@...aphore.gr>, 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 Friday, February 22, 2013 11:27:09 AM Viresh Kumar wrote:
> On Fri, Feb 22, 2013 at 7:26 AM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> > On 21 February 2013 23:09, Stratos Karafotis <stratosk@...aphore.gr> wrote:
> 
> >> 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>
> 
> Rafael,
> 
> I applied it here with my Ack over my patches, for getting a run by
> "kbuild test robot".
> 
> http://git.linaro.org/gitweb?p=people/vireshk/linux.git;a=shortlog;h=refs/heads/cpufreq-for-3.10

Thanks, but I'm still not entirely sure about the have_multiple_policies stuff
(yes, I saw your arguments) and the v3.10 merge window is still two months
away.  IOW, please slow down a bit.

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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