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* do_dbs_timer invocation. We do not want do_dbs_timer to run
* when user is changing the governor or limits.
*/
struct mutex timer_mutex;
};
/*
* mutex that serializes governor limit change with
* do_darkness_timer invocation. We do not want do_darkness_timer to run
* when user is changing the governor or limits.
*/
static DEFINE_PER_CPU(struct cpufreq_darkness_cpuinfo, od_darkness_cpuinfo);
static unsigned int darkness_enable; /* number of CPUs using this policy */
/*
* darkness_mutex protects darkness_enable in governor start/stop.
*/
static DEFINE_MUTEX(darkness_mutex);
/* darkness tuners */
static struct darkness_tuners {
unsigned int sampling_rate;
unsigned int io_is_busy;
} darkness_tuners_ins = {
.sampling_rate = 60000,
.io_is_busy = 0,
};
/************************** sysfs interface ************************/
/* cpufreq_darkness Governor Tunables */
#define show_one(file_name, object) \
static ssize_t show_##file_name \
(struct kobject *kobj, struct attribute *attr, char *buf) \
{ \
return sprintf(buf, ""%d\n"", darkness_tuners_ins.object); \
}
show_one(sampling_rate, sampling_rate);
show_one(io_is_busy, io_is_busy);
/* sampling_rate */
static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b,
const char *buf, size_t count)
{
int input;
int ret = 0;
int mpd = strcmp(current->comm, ""mpdecision"");
if (mpd == 0)
return ret;
ret = sscanf(buf, ""%u"", &input);
if (ret != 1)
return -EINVAL;
input = max(input,10000);
if (input == darkness_tuners_ins.sampling_rate)
return count;
darkness_tuners_ins.sampling_rate = input;
return count;
}
/* io_is_busy */
static ssize_t store_io_is_busy(struct kobject *a, struct attribute *b,
const char *buf, size_t count)
{
unsigned int input, cpu;
int ret;
ret = sscanf(buf, ""%u"", &input);
if (ret != 1)
return -EINVAL;
if (input > 1)
input = 1;
if (input == darkness_tuners_ins.io_is_busy)
return count;
darkness_tuners_ins.io_is_busy = !!input;
/* we need to re-evaluate prev_cpu_idle */
get_online_cpus();
for_each_online_cpu(cpu) {
struct cpufreq_darkness_cpuinfo *this_darkness_cpuinfo =
&per_cpu(od_darkness_cpuinfo, cpu);
this_darkness_cpuinfo->prev_cpu_idle = get_cpu_idle_time(cpu,
&this_darkness_cpuinfo->prev_cpu_wall, darkness_tuners_ins.io_is_busy);
}
put_online_cpus();
return count;
}
define_one_global_rw(sampling_rate);
define_one_global_rw(io_is_busy);
static struct attribute *darkness_attributes[] = {