diff options
Diffstat (limited to 'drivers/cpufreq/cpufreq_ondemand.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq_ondemand.c | 75 |
1 files changed, 59 insertions, 16 deletions
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index e1314212d8d4..c631f27a3dcc 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -30,6 +30,8 @@ #define DEF_FREQUENCY_DOWN_DIFFERENTIAL (10) #define DEF_FREQUENCY_UP_THRESHOLD (80) +#define DEF_SAMPLING_DOWN_FACTOR (1) +#define MAX_SAMPLING_DOWN_FACTOR (100000) #define MICRO_FREQUENCY_DOWN_DIFFERENTIAL (3) #define MICRO_FREQUENCY_UP_THRESHOLD (95) #define MICRO_FREQUENCY_MIN_SAMPLE_RATE (10000) @@ -82,6 +84,7 @@ struct cpu_dbs_info_s { unsigned int freq_lo; unsigned int freq_lo_jiffies; unsigned int freq_hi_jiffies; + unsigned int rate_mult; int cpu; unsigned int sample_type:1; /* @@ -108,10 +111,12 @@ static struct dbs_tuners { unsigned int up_threshold; unsigned int down_differential; unsigned int ignore_nice; + unsigned int sampling_down_factor; unsigned int powersave_bias; unsigned int io_is_busy; } dbs_tuners_ins = { .up_threshold = DEF_FREQUENCY_UP_THRESHOLD, + .sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR, .down_differential = DEF_FREQUENCY_DOWN_DIFFERENTIAL, .ignore_nice = 0, .powersave_bias = 0, @@ -259,6 +264,7 @@ static ssize_t show_##file_name \ show_one(sampling_rate, sampling_rate); show_one(io_is_busy, io_is_busy); show_one(up_threshold, up_threshold); +show_one(sampling_down_factor, sampling_down_factor); show_one(ignore_nice_load, ignore_nice); show_one(powersave_bias, powersave_bias); @@ -340,6 +346,29 @@ static ssize_t store_up_threshold(struct kobject *a, struct attribute *b, return count; } +static ssize_t store_sampling_down_factor(struct kobject *a, + struct attribute *b, const char *buf, size_t count) +{ + unsigned int input, j; + int ret; + ret = sscanf(buf, "%u", &input); + + if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) + return -EINVAL; + mutex_lock(&dbs_mutex); + dbs_tuners_ins.sampling_down_factor = input; + + /* Reset down sampling multiplier in case it was active */ + for_each_online_cpu(j) { + struct cpu_dbs_info_s *dbs_info; + dbs_info = &per_cpu(od_cpu_dbs_info, j); + dbs_info->rate_mult = 1; + } + mutex_unlock(&dbs_mutex); + + return count; +} + static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b, const char *buf, size_t count) { @@ -401,6 +430,7 @@ static ssize_t store_powersave_bias(struct kobject *a, struct attribute *b, define_one_global_rw(sampling_rate); define_one_global_rw(io_is_busy); define_one_global_rw(up_threshold); +define_one_global_rw(sampling_down_factor); define_one_global_rw(ignore_nice_load); define_one_global_rw(powersave_bias); @@ -409,6 +439,7 @@ static struct attribute *dbs_attributes[] = { &sampling_rate_min.attr, &sampling_rate.attr, &up_threshold.attr, + &sampling_down_factor.attr, &ignore_nice_load.attr, &powersave_bias.attr, &io_is_busy.attr, @@ -459,6 +490,17 @@ static struct attribute_group dbs_attr_group_old = { /************************** sysfs end ************************/ +static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq) +{ + if (dbs_tuners_ins.powersave_bias) + freq = powersave_bias_target(p, freq, CPUFREQ_RELATION_H); + else if (p->cur == p->max) + return; + + __cpufreq_driver_target(p, freq, dbs_tuners_ins.powersave_bias ? + CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); +} + static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info) { unsigned int max_load_freq; @@ -551,19 +593,11 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info) /* Check for frequency increase */ if (max_load_freq > dbs_tuners_ins.up_threshold * policy->cur) { - /* if we are already at full speed then break out early */ - if (!dbs_tuners_ins.powersave_bias) { - if (policy->cur == policy->max) - return; - - __cpufreq_driver_target(policy, policy->max, - CPUFREQ_RELATION_H); - } else { - int freq = powersave_bias_target(policy, policy->max, - CPUFREQ_RELATION_H); - __cpufreq_driver_target(policy, freq, - CPUFREQ_RELATION_L); - } + /* If switching to max speed, apply sampling_down_factor */ + if (policy->cur < policy->max) + this_dbs_info->rate_mult = + dbs_tuners_ins.sampling_down_factor; + dbs_freq_increase(policy, policy->max); return; } @@ -585,6 +619,9 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info) (dbs_tuners_ins.up_threshold - dbs_tuners_ins.down_differential); + /* No longer fully busy, reset rate_mult */ + this_dbs_info->rate_mult = 1; + if (freq_next < policy->min) freq_next = policy->min; @@ -608,9 +645,12 @@ static void do_dbs_timer(struct work_struct *work) int sample_type = dbs_info->sample_type; /* We want all CPUs to do sampling nearly on same jiffy */ - int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate); + int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate + * dbs_info->rate_mult); + + if (num_online_cpus() > 1) + delay -= jiffies % delay; - delay -= jiffies % delay; mutex_lock(&dbs_info->timer_mutex); /* Common NORMAL_SAMPLE setup */ @@ -635,7 +675,9 @@ static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info) { /* We want all CPUs to do sampling nearly on same jiffy */ int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate); - delay -= jiffies % delay; + + if (num_online_cpus() > 1) + delay -= jiffies % delay; dbs_info->sample_type = DBS_NORMAL_SAMPLE; INIT_DELAYED_WORK_DEFERRABLE(&dbs_info->work, do_dbs_timer); @@ -708,6 +750,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, } } this_dbs_info->cpu = cpu; + this_dbs_info->rate_mult = 1; ondemand_powersave_bias_init_cpu(cpu); /* * Start the timerschedule work, when this governor |