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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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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