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[CPUFREQ] Make ondemand sampling per CPU and remove the mutex usage in sampling path.
Make ondemand sampling per CPU and remove the mutex usage in sampling path. Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
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@ -64,6 +64,7 @@ struct cpu_dbs_info_s {
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cputime64_t prev_cpu_idle;
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cputime64_t prev_cpu_wall;
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struct cpufreq_policy *cur_policy;
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struct work_struct work;
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unsigned int enable;
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};
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static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info);
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@ -81,7 +82,7 @@ static unsigned int dbs_enable; /* number of CPUs using this policy */
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static DEFINE_MUTEX (dbs_mutex);
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static DECLARE_WORK (dbs_work, do_dbs_timer, NULL);
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static struct workqueue_struct *dbs_workq;
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static struct workqueue_struct *kondemand_wq;
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struct dbs_tuners {
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unsigned int sampling_rate;
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@ -233,17 +234,15 @@ static struct attribute_group dbs_attr_group = {
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/************************** sysfs end ************************/
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static void dbs_check_cpu(int cpu)
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static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
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{
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unsigned int idle_ticks, total_ticks;
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unsigned int load;
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struct cpu_dbs_info_s *this_dbs_info;
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cputime64_t cur_jiffies;
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struct cpufreq_policy *policy;
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unsigned int j;
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this_dbs_info = &per_cpu(cpu_dbs_info, cpu);
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if (!this_dbs_info->enable)
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return;
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@ -314,35 +313,29 @@ static void dbs_check_cpu(int cpu)
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static void do_dbs_timer(void *data)
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{
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int i;
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lock_cpu_hotplug();
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mutex_lock(&dbs_mutex);
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for_each_online_cpu(i)
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dbs_check_cpu(i);
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queue_delayed_work(dbs_workq, &dbs_work,
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usecs_to_jiffies(dbs_tuners_ins.sampling_rate));
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mutex_unlock(&dbs_mutex);
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unlock_cpu_hotplug();
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unsigned int cpu = smp_processor_id();
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struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, cpu);
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dbs_check_cpu(dbs_info);
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queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work,
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usecs_to_jiffies(dbs_tuners_ins.sampling_rate));
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}
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static inline void dbs_timer_init(void)
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static inline void dbs_timer_init(unsigned int cpu)
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{
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INIT_WORK(&dbs_work, do_dbs_timer, NULL);
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if (!dbs_workq)
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dbs_workq = create_singlethread_workqueue("ondemand");
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if (!dbs_workq) {
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printk(KERN_ERR "ondemand: Cannot initialize kernel thread\n");
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return;
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}
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queue_delayed_work(dbs_workq, &dbs_work,
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usecs_to_jiffies(dbs_tuners_ins.sampling_rate));
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struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, cpu);
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INIT_WORK(&dbs_info->work, do_dbs_timer, 0);
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queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work,
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usecs_to_jiffies(dbs_tuners_ins.sampling_rate));
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return;
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}
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static inline void dbs_timer_exit(void)
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static inline void dbs_timer_exit(unsigned int cpu)
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{
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if (dbs_workq)
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cancel_rearming_delayed_workqueue(dbs_workq, &dbs_work);
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struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, cpu);
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cancel_rearming_delayed_workqueue(kondemand_wq, &dbs_info->work);
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}
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static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
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@ -370,6 +363,16 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
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break;
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mutex_lock(&dbs_mutex);
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dbs_enable++;
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if (dbs_enable == 1) {
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kondemand_wq = create_workqueue("kondemand");
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if (!kondemand_wq) {
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printk(KERN_ERR "Creation of kondemand failed\n");
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dbs_enable--;
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mutex_unlock(&dbs_mutex);
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return -ENOSPC;
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}
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}
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for_each_cpu_mask(j, policy->cpus) {
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struct cpu_dbs_info_s *j_dbs_info;
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j_dbs_info = &per_cpu(cpu_dbs_info, j);
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@ -380,7 +383,6 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
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}
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this_dbs_info->enable = 1;
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sysfs_create_group(&policy->kobj, &dbs_attr_group);
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dbs_enable++;
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/*
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* Start the timerschedule work, when this governor
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* is used for first time
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@ -399,23 +401,20 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
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def_sampling_rate = MIN_STAT_SAMPLING_RATE;
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dbs_tuners_ins.sampling_rate = def_sampling_rate;
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dbs_timer_init();
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}
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dbs_timer_init(policy->cpu);
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mutex_unlock(&dbs_mutex);
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break;
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case CPUFREQ_GOV_STOP:
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mutex_lock(&dbs_mutex);
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dbs_timer_exit(policy->cpu);
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this_dbs_info->enable = 0;
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sysfs_remove_group(&policy->kobj, &dbs_attr_group);
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dbs_enable--;
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/*
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* Stop the timerschedule work, when this governor
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* is used for first time
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*/
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if (dbs_enable == 0)
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dbs_timer_exit();
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destroy_workqueue(kondemand_wq);
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mutex_unlock(&dbs_mutex);
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@ -452,13 +451,6 @@ static int __init cpufreq_gov_dbs_init(void)
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static void __exit cpufreq_gov_dbs_exit(void)
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{
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/* Make sure that the scheduled work is indeed not running.
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Assumes the timer has been cancelled first. */
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if (dbs_workq) {
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flush_workqueue(dbs_workq);
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destroy_workqueue(dbs_workq);
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}
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cpufreq_unregister_governor(&cpufreq_gov_dbs);
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}
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