diff options
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/cpufreq_conservative.c | 55 |
1 files changed, 18 insertions, 37 deletions
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c index 7498f2506ade..a152d2c46be7 100644 --- a/drivers/cpufreq/cpufreq_conservative.c +++ b/drivers/cpufreq/cpufreq_conservative.c @@ -65,6 +65,8 @@ struct cpu_dbs_info_s { unsigned int prev_cpu_idle_up; unsigned int prev_cpu_idle_down; unsigned int enable; + unsigned int down_skip; + unsigned int requested_freq; }; static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info); @@ -297,35 +299,12 @@ static void dbs_check_cpu(int cpu) unsigned int tmp_idle_ticks, total_idle_ticks; unsigned int freq_step; unsigned int freq_down_sampling_rate; - static unsigned short down_skip[NR_CPUS]; - static unsigned int requested_freq[NR_CPUS]; - static unsigned int init_flag = NR_CPUS; struct cpu_dbs_info_s *this_dbs_info = &per_cpu(cpu_dbs_info, cpu); struct cpufreq_policy *policy; if (!this_dbs_info->enable) return; - if ( init_flag != 0 ) { - for_each_cpu(init_flag) { - down_skip[init_flag] = 0; - /* I doubt a CPU exists with a freq of 0hz :) */ - requested_freq[init_flag] = 0; - } - init_flag = 0; - } - - /* - * If its a freshly initialised cpu we setup requested_freq. This - * check could be avoided if we did not care about a first time - * stunted increase in CPU speed when there is a load. I feel we - * should be initialising this to something. The removal of a CPU - * is not a problem, after a short time the CPU should settle down - * to a 'natural' frequency. - */ - if (requested_freq[cpu] == 0) - requested_freq[cpu] = this_dbs_info->cur_policy->cur; - policy = this_dbs_info->cur_policy; /* @@ -360,12 +339,12 @@ static void dbs_check_cpu(int cpu) usecs_to_jiffies(dbs_tuners_ins.sampling_rate); if (idle_ticks < up_idle_ticks) { - down_skip[cpu] = 0; + this_dbs_info->down_skip = 0; this_dbs_info->prev_cpu_idle_down = this_dbs_info->prev_cpu_idle_up; /* if we are already at full speed then break out early */ - if (requested_freq[cpu] == policy->max) + if (this_dbs_info->requested_freq == policy->max) return; freq_step = (dbs_tuners_ins.freq_step * policy->max) / 100; @@ -374,18 +353,18 @@ static void dbs_check_cpu(int cpu) if (unlikely(freq_step == 0)) freq_step = 5; - requested_freq[cpu] += freq_step; - if (requested_freq[cpu] > policy->max) - requested_freq[cpu] = policy->max; + this_dbs_info->requested_freq += freq_step; + if (this_dbs_info->requested_freq > policy->max) + this_dbs_info->requested_freq = policy->max; - __cpufreq_driver_target(policy, requested_freq[cpu], + __cpufreq_driver_target(policy, this_dbs_info->requested_freq, CPUFREQ_RELATION_H); return; } /* Check for frequency decrease */ - down_skip[cpu]++; - if (down_skip[cpu] < dbs_tuners_ins.sampling_down_factor) + this_dbs_info->down_skip++; + if (this_dbs_info->down_skip < dbs_tuners_ins.sampling_down_factor) return; /* Check for frequency decrease */ @@ -399,7 +378,7 @@ static void dbs_check_cpu(int cpu) /* Scale idle ticks by 100 and compare with up and down ticks */ idle_ticks *= 100; - down_skip[cpu] = 0; + this_dbs_info->down_skip = 0; freq_down_sampling_rate = dbs_tuners_ins.sampling_rate * dbs_tuners_ins.sampling_down_factor; @@ -412,7 +391,7 @@ static void dbs_check_cpu(int cpu) * or if we 'cannot' reduce the speed as the user might want * freq_step to be zero */ - if (requested_freq[cpu] == policy->min + if (this_dbs_info->requested_freq == policy->min || dbs_tuners_ins.freq_step == 0) return; @@ -422,11 +401,11 @@ static void dbs_check_cpu(int cpu) if (unlikely(freq_step == 0)) freq_step = 5; - requested_freq[cpu] -= freq_step; - if (requested_freq[cpu] < policy->min) - requested_freq[cpu] = policy->min; + this_dbs_info->requested_freq -= freq_step; + if (this_dbs_info->requested_freq < policy->min) + this_dbs_info->requested_freq = policy->min; - __cpufreq_driver_target(policy, requested_freq[cpu], + __cpufreq_driver_target(policy, this_dbs_info->requested_freq, CPUFREQ_RELATION_H); return; } @@ -489,6 +468,8 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, = j_dbs_info->prev_cpu_idle_up; } this_dbs_info->enable = 1; + this_dbs_info->down_skip = 0; + this_dbs_info->requested_freq = policy->cur; sysfs_create_group(&policy->kobj, &dbs_attr_group); dbs_enable++; /* |