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    Subject[PATCH] cpufreq: Fix ondemand governor powersave_bias execution time misuse
    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 <>

    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 {
    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);

     \ /
      Last update: 2010-11-05 04:07    [W:0.019 / U:112.664 seconds]
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