| /* |
| * drivers/cpufreq/cpufreq_stats.c |
| * |
| * Copyright (C) 2003-2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>. |
| * (C) 2004 Zou Nan hai <nanhai.zou@intel.com>. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/atomic.h> |
| #include <linux/cpu.h> |
| #include <linux/cpufreq.h> |
| #include <linux/cputime.h> |
| #include <linux/hashtable.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/proc_fs.h> |
| #include <linux/profile.h> |
| #include <linux/sched.h> |
| #include <linux/seq_file.h> |
| #include <linux/slab.h> |
| #include <linux/sort.h> |
| |
| #define UID_HASH_BITS 10 |
| |
| DECLARE_HASHTABLE(uid_hash_table, UID_HASH_BITS); |
| |
| static spinlock_t cpufreq_stats_lock; |
| |
| static DEFINE_SPINLOCK(task_time_in_state_lock); /* task->time_in_state */ |
| static DEFINE_RT_MUTEX(uid_lock); /* uid_hash_table */ |
| |
| struct uid_entry { |
| uid_t uid; |
| unsigned int dead_max_state; |
| unsigned int alive_max_state; |
| u64 *dead_time_in_state; |
| u64 *alive_time_in_state; |
| struct hlist_node hash; |
| }; |
| |
| struct cpufreq_stats { |
| unsigned int total_trans; |
| unsigned long long last_time; |
| unsigned int max_state; |
| int prev_states; |
| atomic_t curr_state; |
| u64 *time_in_state; |
| unsigned int *freq_table; |
| }; |
| |
| static int cpufreq_max_state; |
| static int cpufreq_last_max_state; |
| static unsigned int *cpufreq_states; |
| static bool cpufreq_stats_initialized; |
| |
| struct cpufreq_stats_attribute { |
| struct attribute attr; |
| |
| ssize_t (*show)(struct cpufreq_stats *, char *); |
| }; |
| |
| /* Caller must hold uid lock */ |
| static struct uid_entry *find_uid_entry(uid_t uid) |
| { |
| struct uid_entry *uid_entry; |
| |
| hash_for_each_possible(uid_hash_table, uid_entry, hash, uid) { |
| if (uid_entry->uid == uid) |
| return uid_entry; |
| } |
| return NULL; |
| } |
| |
| /* Caller must hold uid lock */ |
| static struct uid_entry *find_or_register_uid(uid_t uid) |
| { |
| struct uid_entry *uid_entry; |
| |
| uid_entry = find_uid_entry(uid); |
| if (uid_entry) |
| return uid_entry; |
| |
| uid_entry = kzalloc(sizeof(struct uid_entry), GFP_ATOMIC); |
| if (!uid_entry) |
| return NULL; |
| |
| uid_entry->uid = uid; |
| |
| hash_add(uid_hash_table, &uid_entry->hash, uid); |
| |
| return uid_entry; |
| } |
| |
| |
| static int uid_time_in_state_show(struct seq_file *m, void *v) |
| { |
| struct uid_entry *uid_entry; |
| struct task_struct *task, *temp; |
| unsigned long bkt, flags; |
| struct cpufreq_policy *last_policy = NULL; |
| int i; |
| |
| if (!cpufreq_stats_initialized) |
| return 0; |
| |
| seq_puts(m, "uid:"); |
| for_each_possible_cpu(i) { |
| struct cpufreq_frequency_table *table, *pos; |
| struct cpufreq_policy *policy; |
| |
| policy = cpufreq_cpu_get(i); |
| if (!policy) |
| continue; |
| table = cpufreq_frequency_get_table(i); |
| |
| /* Assumes cpus are colocated within a policy */ |
| if (table && last_policy != policy) { |
| last_policy = policy; |
| cpufreq_for_each_valid_entry(pos, table) |
| seq_printf(m, " %d", pos->frequency); |
| } |
| cpufreq_cpu_put(policy); |
| } |
| seq_putc(m, '\n'); |
| |
| rt_mutex_lock(&uid_lock); |
| |
| rcu_read_lock(); |
| do_each_thread(temp, task) { |
| |
| uid_entry = find_or_register_uid(from_kuid_munged( |
| current_user_ns(), task_uid(task))); |
| if (!uid_entry) |
| continue; |
| |
| if (uid_entry->alive_max_state < task->max_state) { |
| uid_entry->alive_time_in_state = krealloc( |
| uid_entry->alive_time_in_state, |
| task->max_state * |
| sizeof(uid_entry->alive_time_in_state[0]), |
| GFP_ATOMIC); |
| memset(uid_entry->alive_time_in_state + |
| uid_entry->alive_max_state, |
| 0, (task->max_state - |
| uid_entry->alive_max_state) * |
| sizeof(uid_entry->alive_time_in_state[0])); |
| uid_entry->alive_max_state = task->max_state; |
| } |
| |
| spin_lock_irqsave(&task_time_in_state_lock, flags); |
| if (task->time_in_state) { |
| for (i = 0; i < task->max_state; ++i) { |
| uid_entry->alive_time_in_state[i] += |
| atomic_read(&task->time_in_state[i]); |
| } |
| } |
| spin_unlock_irqrestore(&task_time_in_state_lock, flags); |
| |
| } while_each_thread(temp, task); |
| rcu_read_unlock(); |
| |
| hash_for_each(uid_hash_table, bkt, uid_entry, hash) { |
| int max_state = uid_entry->dead_max_state; |
| |
| if (uid_entry->alive_max_state > max_state) |
| max_state = uid_entry->alive_max_state; |
| if (max_state) |
| seq_printf(m, "%d:", uid_entry->uid); |
| for (i = 0; i < max_state; ++i) { |
| u64 total_time_in_state = 0; |
| |
| if (uid_entry->dead_time_in_state && |
| i < uid_entry->dead_max_state) { |
| total_time_in_state = |
| uid_entry->dead_time_in_state[i]; |
| } |
| if (uid_entry->alive_time_in_state && |
| i < uid_entry->alive_max_state) { |
| total_time_in_state += |
| uid_entry->alive_time_in_state[i]; |
| } |
| seq_printf(m, " %lu", (unsigned long) |
| cputime_to_clock_t(total_time_in_state)); |
| } |
| if (max_state) |
| seq_putc(m, '\n'); |
| |
| kfree(uid_entry->alive_time_in_state); |
| uid_entry->alive_time_in_state = NULL; |
| uid_entry->alive_max_state = 0; |
| } |
| |
| rt_mutex_unlock(&uid_lock); |
| return 0; |
| } |
| |
| static int cpufreq_stats_update(struct cpufreq_stats *stats) |
| { |
| unsigned long long cur_time = get_jiffies_64(); |
| |
| spin_lock(&cpufreq_stats_lock); |
| stats->time_in_state[atomic_read(&stats->curr_state)] += |
| cur_time - stats->last_time; |
| stats->last_time = cur_time; |
| spin_unlock(&cpufreq_stats_lock); |
| return 0; |
| } |
| |
| void cpufreq_task_stats_init(struct task_struct *p) |
| { |
| size_t alloc_size; |
| void *temp; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&task_time_in_state_lock, flags); |
| p->time_in_state = NULL; |
| spin_unlock_irqrestore(&task_time_in_state_lock, flags); |
| WRITE_ONCE(p->max_state, 0); |
| |
| if (!cpufreq_stats_initialized) |
| return; |
| |
| /* We use one array to avoid multiple allocs per task */ |
| WRITE_ONCE(p->max_state, cpufreq_max_state); |
| |
| alloc_size = p->max_state * sizeof(p->time_in_state[0]); |
| temp = kzalloc(alloc_size, GFP_ATOMIC); |
| |
| spin_lock_irqsave(&task_time_in_state_lock, flags); |
| p->time_in_state = temp; |
| spin_unlock_irqrestore(&task_time_in_state_lock, flags); |
| } |
| |
| void cpufreq_task_stats_exit(struct task_struct *p) |
| { |
| unsigned long flags; |
| void *temp; |
| |
| spin_lock_irqsave(&task_time_in_state_lock, flags); |
| temp = p->time_in_state; |
| p->time_in_state = NULL; |
| spin_unlock_irqrestore(&task_time_in_state_lock, flags); |
| kfree(temp); |
| } |
| |
| int proc_time_in_state_show(struct seq_file *m, struct pid_namespace *ns, |
| struct pid *pid, struct task_struct *p) |
| { |
| int i; |
| cputime_t cputime; |
| unsigned long flags; |
| |
| if (!cpufreq_stats_initialized || !p->time_in_state) |
| return 0; |
| |
| spin_lock(&cpufreq_stats_lock); |
| for (i = 0; i < p->max_state; ++i) { |
| cputime = 0; |
| spin_lock_irqsave(&task_time_in_state_lock, flags); |
| if (p->time_in_state) |
| cputime = atomic_read(&p->time_in_state[i]); |
| spin_unlock_irqrestore(&task_time_in_state_lock, flags); |
| |
| seq_printf(m, "%d %lu\n", cpufreq_states[i], |
| (unsigned long)cputime_to_clock_t(cputime)); |
| } |
| spin_unlock(&cpufreq_stats_lock); |
| |
| return 0; |
| } |
| |
| static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf) |
| { |
| return sprintf(buf, "%d\n", policy->stats->total_trans); |
| } |
| |
| static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf) |
| { |
| struct cpufreq_stats *stats = policy->stats; |
| ssize_t len = 0; |
| int i; |
| |
| cpufreq_stats_update(stats); |
| for (i = 0; i < stats->max_state; i++) { |
| len += sprintf(buf + len, "%u %llu\n", stats->freq_table[i], |
| (unsigned long long) |
| jiffies_64_to_clock_t(stats->time_in_state[i])); |
| } |
| return len; |
| } |
| |
| /* Called without cpufreq_stats_lock held */ |
| void acct_update_power(struct task_struct *task, cputime_t cputime) |
| { |
| struct cpufreq_stats *stats; |
| struct cpufreq_policy *policy; |
| unsigned int cpu_num; |
| unsigned int state; |
| unsigned long flags; |
| |
| if (!task) |
| return; |
| |
| cpu_num = task_cpu(task); |
| policy = cpufreq_cpu_get(cpu_num); |
| if (!policy) |
| return; |
| |
| stats = policy->stats; |
| if (!stats) { |
| cpufreq_cpu_put(policy); |
| return; |
| } |
| |
| state = stats->prev_states + atomic_read(&policy->stats->curr_state); |
| |
| /* This function is called from a different context |
| * Interruptions in between reads/assignements are ok |
| */ |
| if (cpufreq_stats_initialized && |
| !(task->flags & PF_EXITING) && |
| state < READ_ONCE(task->max_state)) { |
| spin_lock_irqsave(&task_time_in_state_lock, flags); |
| if (task->time_in_state) |
| atomic64_add(cputime, &task->time_in_state[state]); |
| spin_unlock_irqrestore(&task_time_in_state_lock, flags); |
| } |
| cpufreq_cpu_put(policy); |
| |
| } |
| EXPORT_SYMBOL_GPL(acct_update_power); |
| |
| static ssize_t show_all_time_in_state(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf) |
| { |
| ssize_t len = 0; |
| unsigned int i, cpu, freq; |
| struct cpufreq_policy *policy; |
| struct cpufreq_stats *stats; |
| |
| len += scnprintf(buf + len, PAGE_SIZE - len, "freq\t\t"); |
| for_each_possible_cpu(cpu) { |
| policy = cpufreq_cpu_get(cpu); |
| if (!policy) |
| continue; |
| stats = policy->stats; |
| len += scnprintf(buf + len, PAGE_SIZE - len, "cpu%u\t\t", cpu); |
| cpufreq_stats_update(stats); |
| cpufreq_cpu_put(policy); |
| } |
| |
| if (!cpufreq_stats_initialized) |
| goto out; |
| for (i = 0; i < cpufreq_max_state; i++) { |
| freq = cpufreq_states[i]; |
| len += scnprintf(buf + len, PAGE_SIZE - len, "\n%u\t\t", freq); |
| for_each_possible_cpu(cpu) { |
| policy = cpufreq_cpu_get(cpu); |
| if (!policy) |
| continue; |
| stats = policy->stats; |
| if (i >= stats->prev_states && |
| i < stats->prev_states + stats->max_state) { |
| len += scnprintf(buf + len, PAGE_SIZE - len, |
| "%lu\t\t", (unsigned long) |
| cputime64_to_clock_t( |
| stats->time_in_state[i - |
| stats->prev_states])); |
| } else { |
| len += scnprintf(buf + len, PAGE_SIZE - len, |
| "N/A\t\t"); |
| } |
| cpufreq_cpu_put(policy); |
| } |
| } |
| |
| out: |
| len += scnprintf(buf + len, PAGE_SIZE - len, "\n"); |
| return len; |
| } |
| |
| cpufreq_freq_attr_ro(total_trans); |
| cpufreq_freq_attr_ro(time_in_state); |
| |
| static struct attribute *default_attrs[] = { |
| &total_trans.attr, |
| &time_in_state.attr, |
| NULL |
| }; |
| static struct attribute_group stats_attr_group = { |
| .attrs = default_attrs, |
| .name = "stats" |
| }; |
| |
| static struct kobj_attribute _attr_all_time_in_state = __ATTR(all_time_in_state, |
| 0444, show_all_time_in_state, NULL); |
| |
| |
| static int freq_table_get_index(struct cpufreq_stats *stats, unsigned int freq) |
| { |
| int index; |
| for (index = 0; index < stats->max_state; index++) |
| if (stats->freq_table[index] == freq) |
| return index; |
| return -1; |
| } |
| |
| static void __cpufreq_stats_free_table(struct cpufreq_policy *policy) |
| { |
| struct cpufreq_stats *stats = policy->stats; |
| |
| if (!stats) |
| return; |
| |
| pr_debug("%s: Free stats table\n", __func__); |
| |
| sysfs_remove_group(&policy->kobj, &stats_attr_group); |
| kfree(stats->time_in_state); |
| kfree(stats); |
| policy->stats = NULL; |
| /* cpufreq_last_max_state is always incrementing, not changed here */ |
| } |
| |
| static void cpufreq_stats_free_table(unsigned int cpu) |
| { |
| struct cpufreq_policy *policy; |
| |
| policy = cpufreq_cpu_get(cpu); |
| if (!policy) |
| return; |
| |
| if (cpufreq_frequency_get_table(policy->cpu)) |
| __cpufreq_stats_free_table(policy); |
| |
| cpufreq_cpu_put(policy); |
| } |
| |
| |
| static int cpufreq_stats_create_all_table(void) |
| { |
| struct cpufreq_policy *last_policy = NULL; |
| struct cpufreq_policy *policy; |
| struct cpufreq_stats *stats; |
| int cpu, i; |
| |
| cpufreq_states = kcalloc(cpufreq_max_state, sizeof(unsigned int), |
| GFP_KERNEL); |
| if (cpufreq_states == NULL) |
| return -ENOMEM; |
| |
| for_each_possible_cpu(cpu) { |
| policy = cpufreq_cpu_get(cpu); |
| if (!policy) |
| continue; |
| stats = policy->stats; |
| if (policy != last_policy) { |
| for (i = 0; i < stats->max_state; ++i) |
| cpufreq_states[stats->prev_states + i] |
| = stats->freq_table[i]; |
| last_policy = policy; |
| } |
| cpufreq_cpu_put(policy); |
| } |
| return 0; |
| } |
| |
| static int __cpufreq_stats_create_table(struct cpufreq_policy *policy, |
| struct cpufreq_frequency_table *table, int count) |
| { |
| unsigned int i, ret = 0; |
| struct cpufreq_stats *stats; |
| unsigned int alloc_size; |
| struct cpufreq_frequency_table *pos; |
| |
| if (policy->stats) |
| return -EBUSY; |
| |
| stats = kzalloc(sizeof(*stats), GFP_KERNEL); |
| if (stats == NULL) |
| return -ENOMEM; |
| |
| ret = sysfs_create_group(&policy->kobj, &stats_attr_group); |
| if (ret) |
| pr_warn("Cannot create stats attr group\n"); |
| |
| alloc_size = count * sizeof(u64) + count * sizeof(unsigned int); |
| |
| stats->time_in_state = kzalloc(alloc_size, GFP_KERNEL); |
| if (!stats->time_in_state) { |
| ret = -ENOMEM; |
| goto error_alloc; |
| } |
| stats->freq_table = (unsigned int *)(stats->time_in_state + count); |
| |
| i = 0; |
| cpufreq_for_each_valid_entry(pos, table) |
| if (freq_table_get_index(stats, pos->frequency) == -1) |
| stats->freq_table[i++] = pos->frequency; |
| |
| cpufreq_last_max_state = cpufreq_max_state; |
| stats->prev_states = cpufreq_last_max_state; |
| stats->max_state = count; |
| cpufreq_max_state += count; |
| |
| spin_lock(&cpufreq_stats_lock); |
| stats->last_time = get_jiffies_64(); |
| atomic_set(&stats->curr_state, |
| freq_table_get_index(stats, policy->cur)); |
| spin_unlock(&cpufreq_stats_lock); |
| policy->stats = stats; |
| return 0; |
| error_alloc: |
| sysfs_remove_group(&policy->kobj, &stats_attr_group); |
| kfree(stats); |
| policy->stats = NULL; |
| return ret; |
| } |
| |
| static void cpufreq_stats_create_table(struct cpufreq_policy *policy) |
| { |
| struct cpufreq_frequency_table *table, *pos; |
| int count = 0; |
| |
| table = cpufreq_frequency_get_table(policy->cpu); |
| if (likely(table)) { |
| cpufreq_for_each_valid_entry(pos, table) |
| count++; |
| |
| __cpufreq_stats_create_table(policy, table, count); |
| } |
| } |
| |
| void cpufreq_task_stats_remove_uids(uid_t uid_start, uid_t uid_end) |
| { |
| struct uid_entry *uid_entry; |
| struct hlist_node *tmp; |
| |
| rt_mutex_lock(&uid_lock); |
| |
| for (; uid_start <= uid_end; uid_start++) { |
| hash_for_each_possible_safe(uid_hash_table, uid_entry, tmp, |
| hash, uid_start) { |
| if (uid_start == uid_entry->uid) { |
| hash_del(&uid_entry->hash); |
| kfree(uid_entry->dead_time_in_state); |
| kfree(uid_entry); |
| } |
| } |
| } |
| |
| rt_mutex_unlock(&uid_lock); |
| } |
| |
| static int cpufreq_stat_notifier_policy(struct notifier_block *nb, |
| unsigned long val, void *data) |
| { |
| int ret = 0, count = 0; |
| struct cpufreq_policy *policy = data; |
| struct cpufreq_frequency_table *table, *pos; |
| |
| table = cpufreq_frequency_get_table(policy->cpu); |
| if (!table) |
| return 0; |
| |
| cpufreq_for_each_valid_entry(pos, table) |
| count++; |
| |
| if (val == CPUFREQ_CREATE_POLICY) |
| ret = __cpufreq_stats_create_table(policy, table, count); |
| else if (val == CPUFREQ_REMOVE_POLICY) |
| __cpufreq_stats_free_table(policy); |
| |
| return ret; |
| } |
| |
| static int cpufreq_stat_notifier_trans(struct notifier_block *nb, |
| unsigned long val, void *data) |
| { |
| struct cpufreq_freqs *freq = data; |
| struct cpufreq_stats *stat; |
| struct cpufreq_policy *policy; |
| |
| if (val != CPUFREQ_POSTCHANGE) |
| return 0; |
| |
| policy = cpufreq_cpu_get(freq->cpu); |
| if (!policy) |
| return 0; |
| |
| stat = policy->stats; |
| if (!stat) { |
| cpufreq_cpu_put(policy); |
| return 0; |
| } |
| |
| cpufreq_stats_update(policy->stats); |
| spin_lock(&cpufreq_stats_lock); |
| atomic_set(&stat->curr_state, freq_table_get_index(stat, freq->new)); |
| stat->total_trans++; |
| spin_unlock(&cpufreq_stats_lock); |
| cpufreq_cpu_put(policy); |
| return 0; |
| } |
| |
| |
| static int process_notifier(struct notifier_block *self, |
| unsigned long cmd, void *v) |
| { |
| struct task_struct *task = v; |
| struct uid_entry *uid_entry; |
| unsigned long flags; |
| uid_t uid; |
| int i; |
| |
| if (!task) |
| return NOTIFY_OK; |
| |
| rt_mutex_lock(&uid_lock); |
| |
| uid = from_kuid_munged(current_user_ns(), task_uid(task)); |
| uid_entry = find_or_register_uid(uid); |
| if (!uid_entry) { |
| rt_mutex_unlock(&uid_lock); |
| pr_err("%s: failed to find uid %d\n", __func__, uid); |
| return NOTIFY_OK; |
| } |
| |
| if (uid_entry->dead_max_state < task->max_state) { |
| uid_entry->dead_time_in_state = krealloc( |
| uid_entry->dead_time_in_state, |
| task->max_state * |
| sizeof(uid_entry->dead_time_in_state[0]), |
| GFP_ATOMIC); |
| memset(uid_entry->dead_time_in_state + |
| uid_entry->dead_max_state, |
| 0, (task->max_state - uid_entry->dead_max_state) * |
| sizeof(uid_entry->dead_time_in_state[0])); |
| uid_entry->dead_max_state = task->max_state; |
| } |
| |
| spin_lock_irqsave(&task_time_in_state_lock, flags); |
| if (task->time_in_state) { |
| for (i = 0; i < task->max_state; ++i) { |
| uid_entry->dead_time_in_state[i] += |
| atomic_read(&task->time_in_state[i]); |
| } |
| } |
| spin_unlock_irqrestore(&task_time_in_state_lock, flags); |
| |
| rt_mutex_unlock(&uid_lock); |
| return NOTIFY_OK; |
| } |
| |
| static int uid_time_in_state_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, uid_time_in_state_show, PDE_DATA(inode)); |
| } |
| |
| static const struct file_operations uid_time_in_state_fops = { |
| .open = uid_time_in_state_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static struct notifier_block notifier_policy_block = { |
| .notifier_call = cpufreq_stat_notifier_policy |
| }; |
| |
| static struct notifier_block notifier_trans_block = { |
| .notifier_call = cpufreq_stat_notifier_trans |
| }; |
| |
| static struct notifier_block process_notifier_block = { |
| .notifier_call = process_notifier, |
| }; |
| |
| static int __init cpufreq_stats_init(void) |
| { |
| int ret; |
| unsigned int cpu; |
| struct cpufreq_policy *policy; |
| struct cpufreq_policy *last_policy = NULL; |
| |
| spin_lock_init(&cpufreq_stats_lock); |
| ret = cpufreq_register_notifier(¬ifier_policy_block, |
| CPUFREQ_POLICY_NOTIFIER); |
| if (ret) |
| return ret; |
| |
| get_online_cpus(); |
| for_each_online_cpu(cpu) { |
| policy = cpufreq_cpu_get(cpu); |
| if (!policy) |
| continue; |
| if (policy != last_policy) { |
| cpufreq_stats_create_table(policy); |
| last_policy = policy; |
| } |
| cpufreq_cpu_put(policy); |
| } |
| put_online_cpus(); |
| |
| /* XXX TODO task support for time_in_state doesn't update freq |
| * info for tasks already initialized, so tasks initialized early |
| * (before cpufreq_stat_init is done) do not get time_in_state data |
| * and CPUFREQ_TRANSITION_NOTIFIER does not update freq info for |
| * tasks already created |
| */ |
| ret = cpufreq_register_notifier(¬ifier_trans_block, |
| CPUFREQ_TRANSITION_NOTIFIER); |
| if (ret) { |
| cpufreq_unregister_notifier(¬ifier_policy_block, |
| CPUFREQ_POLICY_NOTIFIER); |
| get_online_cpus(); |
| for_each_online_cpu(cpu) |
| cpufreq_stats_free_table(cpu); |
| put_online_cpus(); |
| return ret; |
| } |
| ret = sysfs_create_file(cpufreq_global_kobject, |
| &_attr_all_time_in_state.attr); |
| if (ret) |
| pr_warn("Cannot create sysfs file for cpufreq stats\n"); |
| |
| proc_create_data("uid_time_in_state", 0444, NULL, |
| &uid_time_in_state_fops, NULL); |
| |
| profile_event_register(PROFILE_TASK_EXIT, &process_notifier_block); |
| |
| ret = cpufreq_stats_create_all_table(); |
| if (ret) |
| pr_warn("Cannot create cpufreq all freqs table\n"); |
| |
| cpufreq_stats_initialized = true; |
| return 0; |
| } |
| static void __exit cpufreq_stats_exit(void) |
| { |
| unsigned int cpu; |
| |
| cpufreq_unregister_notifier(¬ifier_policy_block, |
| CPUFREQ_POLICY_NOTIFIER); |
| cpufreq_unregister_notifier(¬ifier_trans_block, |
| CPUFREQ_TRANSITION_NOTIFIER); |
| for_each_online_cpu(cpu) |
| cpufreq_stats_free_table(cpu); |
| } |
| |
| MODULE_AUTHOR("Zou Nan hai <nanhai.zou@intel.com>"); |
| MODULE_DESCRIPTION("Export cpufreq stats via sysfs"); |
| MODULE_LICENSE("GPL"); |
| |
| module_init(cpufreq_stats_init); |
| module_exit(cpufreq_stats_exit); |