linux-kernel - Re: [PATCH] cpufreq: Fix ondemand governor powersave

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Message-Id: <20110301170740.2b4a8288.akpm@linux-foundation.org>
Date:	Tue, 1 Mar 2011 17:07:40 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Youquan Song <youquan.song@...ux.intel.com>
Cc:	davej@...hat.com, arjan@...ux.intel.com, venki@...gle.com,
	youquan.song@...el.com, cpufreq-list@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: Fix ondemand governor powersave_bias execution
 time misuse

On Fri, 5 Nov 2010 11:19:51 -0400
Youquan Song <youquan.song@...ux.intel.com> wrote:

> Ondemand governor use powersave_bias tunable to do aggressive power save by
> decrease CPU average frequency. The average frequency achieve by adjust low and
> high frequency's execution time proportion during one sample time interval.  
> 
> Current kernel, only the high frequency executes in time proportion, but the low
> frequency wrongly execute in one whole sample time interval when powersave_bias
> is set.  
> 
> The patch fix it by set low frequency execution time to it deserved. 
> 
> Signed-off-by: Youquan Song <youquan.song@...el.com>
> ---
> 
> diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
> index c631f27..01d84fa 100644
> --- a/drivers/cpufreq/cpufreq_ondemand.c
> +++ b/drivers/cpufreq/cpufreq_ondemand.c
> @@ -666,6 +666,8 @@ static void do_dbs_timer(struct work_struct *work)
>  	} else {
>  		__cpufreq_driver_target(dbs_info->cur_policy,
>  			dbs_info->freq_lo, CPUFREQ_RELATION_H);
> +		if (dbs_info->sample_type == DBS_SUB_SAMPLE)
> +			delay = dbs_info->freq_lo_jiffies;
>  	}
>  	queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, delay);
>  	mutex_unlock(&dbs_info->timer_mutex);

Where are we with this patch?  Still needed in curent mainline?

Thnks.
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