linux-kernel - Re: [PATCH v3] cpufreq: governor: Be friendly towards latency-sensitive bursty workloads

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Message-ID: <CAKohpo=OSQ0MQuRUPYe39u19_+jGFYH0mqziPvMKx1GcTHB92g@mail.gmail.com>
Date:	Mon, 9 Jun 2014 10:35:39 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Pavel Machek <pavel@....cz>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	"ego@...ux.vnet.ibm.com" <ego@...ux.vnet.ibm.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] cpufreq: governor: Be friendly towards
 latency-sensitive bursty workloads

On 8 June 2014 02:11, Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com> wrote:
> diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c

> +               if (unlikely(wall_time > (2 * sampling_rate)) &&
> +                                               j_cdbs->copy_prev_load) {
> +                       load = j_cdbs->prev_load;
> +                       j_cdbs->copy_prev_load = false;
> +               } else {
> +                       load = 100 * (wall_time - idle_time) / wall_time;
> +                       j_cdbs->prev_load = load;
> +                       j_cdbs->copy_prev_load = true;
> +               }

Hmm, slight modifications over the weekend :) ..
What do you think about removing this extra variable and using prev_load
only, i.e. make it zero in the else part? Also adding a comment for this would
be helpful ?

I will try a patch before you come to office :)
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