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Commit 1206aaac authored by Dave Jones's avatar Dave Jones
Browse files

[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: default avatarAlexander Clouter <alex-kernel@digriz.org.uk>
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent c11420a6

drivers/cpufreq/cpufreq_ondemand.c

+36 −6
Original line number Diff line number Diff line
@@ -79,6 +79,7 @@ struct dbs_tuners { 
	unsigned int		up_threshold;

	unsigned int		down_threshold;

	unsigned int		ignore_nice;

	unsigned int		freq_step;

};



static struct dbs_tuners dbs_tuners_ins = {
@@ -117,6 +118,7 @@ show_one(sampling_down_factor, sampling_down_factor); 
show_one(up_threshold, up_threshold);

show_one(down_threshold, down_threshold);

show_one(ignore_nice, ignore_nice);

show_one(freq_step, freq_step);



static ssize_t store_sampling_down_factor(struct cpufreq_policy *unused, 

		const char *buf, size_t count)
@@ -235,6 +237,29 @@ static ssize_t store_ignore_nice(struct cpufreq_policy *policy, 
	return count;

}



static ssize_t store_freq_step(struct cpufreq_policy *policy,

		const char *buf, size_t count)

{

	unsigned int input;

	int ret;



	ret = sscanf (buf, "%u", &input);



	if ( ret != 1 )

		return -EINVAL;



	if ( input > 100 )

		input = 100;

	

	/* no need to test here if freq_step is zero as the user might actually

	 * want this, they would be crazy though :) */

	down(&dbs_sem);

	dbs_tuners_ins.freq_step = input;

	up(&dbs_sem);



	return count;

}



#define define_one_rw(_name) \

static struct freq_attr _name = \

__ATTR(_name, 0644, show_##_name, store_##_name)
@@ -244,6 +269,7 @@ define_one_rw(sampling_down_factor); 
define_one_rw(up_threshold);

define_one_rw(down_threshold);

define_one_rw(ignore_nice);

define_one_rw(freq_step);



static struct attribute * dbs_attributes[] = {

	&sampling_rate_max.attr,
@@ -253,6 +279,7 @@ static struct attribute * dbs_attributes[] = { 
	&up_threshold.attr,

	&down_threshold.attr,

	&ignore_nice.attr,

	&freq_step.attr,

	NULL

};
@@ -291,7 +318,7 @@ static void dbs_check_cpu(int cpu) 
	 *

	 * Any frequency increase takes it to the maximum frequency. 

	 * Frequency reduction happens at minimum steps of 

	 * 5% of max_frequency 

	 * 5% (default) of max_frequency 

	 */



	/* Check for frequency increase */
@@ -390,11 +417,13 @@ static void dbs_check_cpu(int cpu) 
			usecs_to_jiffies(freq_down_sampling_rate);



	if (idle_ticks > down_idle_ticks ) {

		/* if we are already at the lowest speed then break out early */

		if (policy->cur == policy->min)

		/* if we are already at the lowest speed then break out early

		 * or if we 'cannot' reduce the speed as the user might want

		 * freq_step to be zero */

		if (policy->cur == policy->min || dbs_tuners_ins.freq_step == 0)

			return;



		freq_down_step = (5 * policy->max) / 100;

		freq_down_step = (dbs_tuners_ins.freq_step * policy->max) / 100;



		/* max freq cannot be less than 100. But who knows.... */

		if (unlikely(freq_down_step == 0))
@@ -486,6 +515,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, 
					DEF_SAMPLING_RATE_LATENCY_MULTIPLIER;

			dbs_tuners_ins.sampling_rate = def_sampling_rate;

			dbs_tuners_ins.ignore_nice = 0;

			dbs_tuners_ins.freq_step = 5;



			dbs_timer_init();

		}