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cpufreq: interactive: specify duration of CPU speed boost pulse

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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: Todd Poynor <toddpoynor@google.com>
This commit is contained in:
Todd Poynor 2012-12-14 17:31:19 -08:00 committed by Arve Hjønnevåg
parent 5b28b65949
commit 8c4fc9a26e
1 changed files with 45 additions and 7 deletions
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52
drivers/cpufreq/cpufreq_interactive.c
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@ -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)
}
}
pcpu->floor_freq = new_freq;
pcpu->floor_validate_time = now;
/*
* 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,
};