[CPUFREQ] Allow ondemand stepping to be changed by user.
Adds support so that the cpufreq change stepping is no longer fixed at 5% and can be changed dynamically by the user Signed-off-by: Alexander Clouter <alex-kernel@digriz.org.uk> Signed-off-by: Dave Jones <davej@redhat.com>
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c11420a616
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1206aaac28
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@ -79,6 +79,7 @@ struct dbs_tuners {
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unsigned int up_threshold;
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unsigned int down_threshold;
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unsigned int ignore_nice;
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unsigned int freq_step;
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};
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static struct dbs_tuners dbs_tuners_ins = {
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@ -117,6 +118,7 @@ show_one(sampling_down_factor, sampling_down_factor);
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show_one(up_threshold, up_threshold);
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show_one(down_threshold, down_threshold);
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show_one(ignore_nice, ignore_nice);
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show_one(freq_step, freq_step);
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static ssize_t store_sampling_down_factor(struct cpufreq_policy *unused,
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const char *buf, size_t count)
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@ -235,6 +237,29 @@ static ssize_t store_ignore_nice(struct cpufreq_policy *policy,
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return count;
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}
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static ssize_t store_freq_step(struct cpufreq_policy *policy,
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const char *buf, size_t count)
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{
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unsigned int input;
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int ret;
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ret = sscanf (buf, "%u", &input);
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if ( ret != 1 )
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return -EINVAL;
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if ( input > 100 )
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input = 100;
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/* no need to test here if freq_step is zero as the user might actually
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* want this, they would be crazy though :) */
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down(&dbs_sem);
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dbs_tuners_ins.freq_step = input;
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up(&dbs_sem);
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return count;
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}
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#define define_one_rw(_name) \
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static struct freq_attr _name = \
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__ATTR(_name, 0644, show_##_name, store_##_name)
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@ -244,6 +269,7 @@ define_one_rw(sampling_down_factor);
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define_one_rw(up_threshold);
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define_one_rw(down_threshold);
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define_one_rw(ignore_nice);
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define_one_rw(freq_step);
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static struct attribute * dbs_attributes[] = {
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&sampling_rate_max.attr,
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@ -253,6 +279,7 @@ static struct attribute * dbs_attributes[] = {
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&up_threshold.attr,
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&down_threshold.attr,
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&ignore_nice.attr,
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&freq_step.attr,
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NULL
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};
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@ -291,7 +318,7 @@ static void dbs_check_cpu(int cpu)
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*
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* Any frequency increase takes it to the maximum frequency.
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* Frequency reduction happens at minimum steps of
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* 5% of max_frequency
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* 5% (default) of max_frequency
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*/
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/* Check for frequency increase */
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@ -390,18 +417,20 @@ static void dbs_check_cpu(int cpu)
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usecs_to_jiffies(freq_down_sampling_rate);
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if (idle_ticks > down_idle_ticks ) {
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/* if we are already at the lowest speed then break out early */
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if (policy->cur == policy->min)
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/* if we are already at the lowest speed then break out early
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* or if we 'cannot' reduce the speed as the user might want
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* freq_step to be zero */
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if (policy->cur == policy->min || dbs_tuners_ins.freq_step == 0)
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return;
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freq_down_step = (5 * policy->max) / 100;
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freq_down_step = (dbs_tuners_ins.freq_step * policy->max) / 100;
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/* max freq cannot be less than 100. But who knows.... */
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if (unlikely(freq_down_step == 0))
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freq_down_step = 5;
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__cpufreq_driver_target(policy,
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policy->cur - freq_down_step,
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policy->cur - freq_down_step,
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CPUFREQ_RELATION_H);
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return;
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}
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@ -486,6 +515,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
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DEF_SAMPLING_RATE_LATENCY_MULTIPLIER;
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dbs_tuners_ins.sampling_rate = def_sampling_rate;
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dbs_tuners_ins.ignore_nice = 0;
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dbs_tuners_ins.freq_step = 5;
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dbs_timer_init();
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}
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