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Commit b6b0a06c authored by Todd Poynor's avatar Todd Poynor Committed by Ruchi Kandoi
Browse files

cpufreq: interactive: specify duration of CPU speed boost pulse 



Sysfs attribute boostpulse_duration specifies the duration of boosting CPU
speed in response to bootpulse events.  Duration is specified in usecs,
default 80ms.

Change-Id: Ifd41625574891a44f1787a4e85d1e7b4f2afb52b
Signed-off-by: default avatarTodd Poynor <toddpoynor@google.com>
parent 07a570f9

drivers/cpufreq/cpufreq_interactive.c

+45 −7
Original line number Diff line number Diff line
@@ -95,11 +95,12 @@ static unsigned long timer_rate; 
#define DEFAULT_ABOVE_HISPEED_DELAY DEFAULT_TIMER_RATE

static unsigned long above_hispeed_delay_val;



/*

 * Non-zero means longer-term speed boost active.

 */



/* Non-zero means indefinite speed boost active */

static int boost_val;

/* Duration of a boot pulse in usecs */

static int boostpulse_duration_val = DEFAULT_MIN_SAMPLE_TIME;

/* End time of boost pulse in ktime converted to usecs */

static u64 boostpulse_endtime;



static bool governidle;

module_param(governidle, bool, S_IWUSR | S_IRUGO);
@@ -268,6 +269,7 @@ static void cpufreq_interactive_timer(unsigned long data) 
	unsigned int loadadjfreq;

	unsigned int index;

	unsigned long flags;

	bool boosted;



	smp_rmb();
@@ -286,8 +288,9 @@ static void cpufreq_interactive_timer(unsigned long data) 
	do_div(cputime_speedadj, delta_time);

	loadadjfreq = (unsigned int)cputime_speedadj * 100;

	cpu_load = loadadjfreq / pcpu->target_freq;

	boosted = boost_val || now < boostpulse_endtime;



	if ((cpu_load >= go_hispeed_load || boost_val) &&

	if ((cpu_load >= go_hispeed_load || boosted) &&

	    pcpu->target_freq < hispeed_freq)

		new_freq = hispeed_freq;

	else
@@ -327,8 +330,18 @@ static void cpufreq_interactive_timer(unsigned long data) 
		}

	}



	/*

	 * Update the timestamp for checking whether speed has been held at

	 * or above the selected frequency for a minimum of min_sample_time,

	 * if not boosted to hispeed_freq.  If boosted to hispeed_freq then we

	 * allow the speed to drop as soon as the boostpulse duration expires

	 * (or the indefinite boost is turned off).

	 */



	if (!boosted || new_freq > hispeed_freq) {

		pcpu->floor_freq = new_freq;

		pcpu->floor_validate_time = now;

	}



	if (pcpu->target_freq == new_freq) {

		trace_cpufreq_interactive_already(
@@ -774,6 +787,7 @@ static ssize_t store_boostpulse(struct kobject *kobj, struct attribute *attr, 
	if (ret < 0)

		return ret;



	boostpulse_endtime = ktime_to_us(ktime_get()) + boostpulse_duration_val;

	trace_cpufreq_interactive_boost("pulse");

	cpufreq_interactive_boost();

	return count;
@@ -782,6 +796,29 @@ static ssize_t store_boostpulse(struct kobject *kobj, struct attribute *attr, 
static struct global_attr boostpulse =

	__ATTR(boostpulse, 0200, NULL, store_boostpulse);



static ssize_t show_boostpulse_duration(

	struct kobject *kobj, struct attribute *attr, char *buf)

{

	return sprintf(buf, "%d\n", boostpulse_duration_val);

}



static ssize_t store_boostpulse_duration(

	struct kobject *kobj, struct attribute *attr, const char *buf,

	size_t count)

{

	int ret;

	unsigned long val;



	ret = kstrtoul(buf, 0, &val);

	if (ret < 0)

		return ret;



	boostpulse_duration_val = val;

	return count;

}



define_one_global_rw(boostpulse_duration);



static struct attribute *interactive_attributes[] = {

	&target_loads_attr.attr,

	&hispeed_freq_attr.attr,
@@ -791,6 +828,7 @@ static struct attribute *interactive_attributes[] = { 
	&timer_rate_attr.attr,

	&boost.attr,

	&boostpulse.attr,

	&boostpulse_duration.attr,

	NULL,

};