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[CPUFREQ] Add support to cpufreq_ondemand to ignore 'nice' cpu time

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Signed-off-by: Alexander Clouter <alex-kernel@digriz.org.uk>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Dave Jones 2005-05-31 19:03:47 -07:00
parent b9170836d1
commit 3d5ee9e55d
1 changed files with 62 additions and 4 deletions
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66
drivers/cpufreq/cpufreq_ondemand.c
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@ -78,6 +78,7 @@ struct dbs_tuners {
unsigned int sampling_down_factor;
unsigned int up_threshold;
unsigned int down_threshold;
unsigned int ignore_nice;
};
static struct dbs_tuners dbs_tuners_ins = {
@ -115,6 +116,7 @@ show_one(sampling_rate, sampling_rate);
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);
static ssize_t store_sampling_down_factor(struct cpufreq_policy *unused,
const char *buf, size_t count)
@ -193,6 +195,46 @@ static ssize_t store_down_threshold(struct cpufreq_policy *unused,
return count;
}
static ssize_t store_ignore_nice(struct cpufreq_policy *policy,
const char *buf, size_t count)
{
unsigned int input;
int ret;
unsigned int j;
ret = sscanf (buf, "%u", &input);
if ( ret != 1 )
return -EINVAL;
if ( input > 1 )
input = 1;
down(&dbs_sem);
if ( input == dbs_tuners_ins.ignore_nice ) { /* nothing to do */
up(&dbs_sem);
return count;
}
dbs_tuners_ins.ignore_nice = input;
/* we need to re-evaluate prev_cpu_idle_up and prev_cpu_idle_down */
for_each_cpu_mask(j, policy->cpus) {
struct cpu_dbs_info_s *j_dbs_info;
j_dbs_info = &per_cpu(cpu_dbs_info, j);
j_dbs_info->cur_policy = policy;
j_dbs_info->prev_cpu_idle_up =
kstat_cpu(j).cpustat.idle +
kstat_cpu(j).cpustat.iowait +
( !dbs_tuners_ins.ignore_nice
? kstat_cpu(j).cpustat.nice : 0 );
j_dbs_info->prev_cpu_idle_down = j_dbs_info->prev_cpu_idle_up;
}
up(&dbs_sem);
return count;
}
#define define_one_rw(_name) \
static struct freq_attr _name = \
__ATTR(_name, 0644, show_##_name, store_##_name)
@ -201,6 +243,7 @@ define_one_rw(sampling_rate);
define_one_rw(sampling_down_factor);
define_one_rw(up_threshold);
define_one_rw(down_threshold);
define_one_rw(ignore_nice);
static struct attribute * dbs_attributes[] = {
&sampling_rate_max.attr,
@ -209,6 +252,7 @@ static struct attribute * dbs_attributes[] = {
&sampling_down_factor.attr,
&up_threshold.attr,
&down_threshold.attr,
&ignore_nice.attr,
NULL
};
@ -253,6 +297,9 @@ static void dbs_check_cpu(int cpu)
/* Check for frequency increase */
total_idle_ticks = kstat_cpu(cpu).cpustat.idle +
kstat_cpu(cpu).cpustat.iowait;
/* consider 'nice' tasks as 'idle' time too if required */
if (dbs_tuners_ins.ignore_nice == 0)
total_idle_ticks += kstat_cpu(cpu).cpustat.nice;
idle_ticks = total_idle_ticks -
this_dbs_info->prev_cpu_idle_up;
this_dbs_info->prev_cpu_idle_up = total_idle_ticks;
@ -269,6 +316,9 @@ static void dbs_check_cpu(int cpu)
/* Check for frequency increase */
total_idle_ticks = kstat_cpu(j).cpustat.idle +
kstat_cpu(j).cpustat.iowait;
/* consider 'nice' too? */
if (dbs_tuners_ins.ignore_nice == 0)
total_idle_ticks += kstat_cpu(j).cpustat.nice;
tmp_idle_ticks = total_idle_ticks -
j_dbs_info->prev_cpu_idle_up;
j_dbs_info->prev_cpu_idle_up = total_idle_ticks;
@ -297,6 +347,9 @@ static void dbs_check_cpu(int cpu)
total_idle_ticks = kstat_cpu(cpu).cpustat.idle +
kstat_cpu(cpu).cpustat.iowait;
/* consider 'nice' too? */
if (dbs_tuners_ins.ignore_nice == 0)
total_idle_ticks += kstat_cpu(cpu).cpustat.nice;
idle_ticks = total_idle_ticks -
this_dbs_info->prev_cpu_idle_down;
this_dbs_info->prev_cpu_idle_down = total_idle_ticks;
@ -312,6 +365,9 @@ static void dbs_check_cpu(int cpu)
/* Check for frequency increase */
total_idle_ticks = kstat_cpu(j).cpustat.idle +
kstat_cpu(j).cpustat.iowait;
/* consider 'nice' too? */
if (dbs_tuners_ins.ignore_nice == 0)
total_idle_ticks += kstat_cpu(j).cpustat.nice;
tmp_idle_ticks = total_idle_ticks -
j_dbs_info->prev_cpu_idle_down;
j_dbs_info->prev_cpu_idle_down = total_idle_ticks;
@ -397,10 +453,11 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
j_dbs_info->prev_cpu_idle_up =
kstat_cpu(j).cpustat.idle +
kstat_cpu(j).cpustat.iowait;
j_dbs_info->prev_cpu_idle_down =
kstat_cpu(j).cpustat.idle +
kstat_cpu(j).cpustat.iowait;
kstat_cpu(j).cpustat.iowait +
( !dbs_tuners_ins.ignore_nice
? kstat_cpu(j).cpustat.nice : 0 );
j_dbs_info->prev_cpu_idle_down
= j_dbs_info->prev_cpu_idle_up;
}
this_dbs_info->enable = 1;
sysfs_create_group(&policy->kobj, &dbs_attr_group);
@ -420,6 +477,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
def_sampling_rate = (latency / 1000) *
DEF_SAMPLING_RATE_LATENCY_MULTIPLIER;
dbs_tuners_ins.sampling_rate = def_sampling_rate;
dbs_tuners_ins.ignore_nice = 0;
dbs_timer_init();
}