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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/cpufreq/cpufreq_stats.c
3 *
4 * Copyright (C) 2003-2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
Dave Jones0a829c52009-01-18 01:49:04 -05005 * (C) 2004 Zou Nan hai <nanhai.zou@intel.com>.
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/sysdev.h>
15#include <linux/cpu.h>
16#include <linux/sysfs.h>
17#include <linux/cpufreq.h>
18#include <linux/jiffies.h>
19#include <linux/percpu.h>
20#include <linux/kobject.h>
21#include <linux/spinlock.h>
Ashok Rajc32b6b82005-10-30 14:59:54 -080022#include <linux/notifier.h>
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -070023#include <asm/cputime.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25static spinlock_t cpufreq_stats_lock;
26
Dave Jones0a829c52009-01-18 01:49:04 -050027#define CPUFREQ_STATDEVICE_ATTR(_name, _mode, _show) \
Linus Torvalds1da177e2005-04-16 15:20:36 -070028static struct freq_attr _attr_##_name = {\
Tejun Heo7b595752007-06-14 03:45:17 +090029 .attr = {.name = __stringify(_name), .mode = _mode, }, \
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 .show = _show,\
31};
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033struct cpufreq_stats {
34 unsigned int cpu;
35 unsigned int total_trans;
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -070036 unsigned long long last_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 unsigned int max_state;
38 unsigned int state_num;
39 unsigned int last_index;
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -070040 cputime64_t *time_in_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 unsigned int *freq_table;
42#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
43 unsigned int *trans_table;
44#endif
45};
46
Mike Travis7a6aedf2008-03-25 15:06:53 -070047static DEFINE_PER_CPU(struct cpufreq_stats *, cpufreq_stats_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49struct cpufreq_stats_attribute {
50 struct attribute attr;
51 ssize_t(*show) (struct cpufreq_stats *, char *);
52};
53
Dave Jones0a829c52009-01-18 01:49:04 -050054static int cpufreq_stats_update(unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055{
56 struct cpufreq_stats *stat;
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -070057 unsigned long long cur_time;
58
59 cur_time = get_jiffies_64();
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 spin_lock(&cpufreq_stats_lock);
Mike Travis7a6aedf2008-03-25 15:06:53 -070061 stat = per_cpu(cpufreq_stats_table, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 if (stat->time_in_state)
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -070063 stat->time_in_state[stat->last_index] =
64 cputime64_add(stat->time_in_state[stat->last_index],
65 cputime_sub(cur_time, stat->last_time));
66 stat->last_time = cur_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 spin_unlock(&cpufreq_stats_lock);
68 return 0;
69}
70
Dave Jones0a829c52009-01-18 01:49:04 -050071static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070072{
Mike Travis7a6aedf2008-03-25 15:06:53 -070073 struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
Dave Jones511e9ee2006-05-30 17:57:14 -040074 if (!stat)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 return 0;
76 return sprintf(buf, "%d\n",
Mike Travis7a6aedf2008-03-25 15:06:53 -070077 per_cpu(cpufreq_stats_table, stat->cpu)->total_trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078}
79
Dave Jones0a829c52009-01-18 01:49:04 -050080static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081{
82 ssize_t len = 0;
83 int i;
Mike Travis7a6aedf2008-03-25 15:06:53 -070084 struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
Dave Jones511e9ee2006-05-30 17:57:14 -040085 if (!stat)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 return 0;
87 cpufreq_stats_update(stat->cpu);
88 for (i = 0; i < stat->state_num; i++) {
Dave Jones32ee8c32006-02-28 00:43:23 -050089 len += sprintf(buf + len, "%u %llu\n", stat->freq_table[i],
Dave Jones0a829c52009-01-18 01:49:04 -050090 (unsigned long long)
91 cputime64_to_clock_t(stat->time_in_state[i]));
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 }
93 return len;
94}
95
96#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
Dave Jones0a829c52009-01-18 01:49:04 -050097static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
99 ssize_t len = 0;
100 int i, j;
101
Mike Travis7a6aedf2008-03-25 15:06:53 -0700102 struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
Dave Jones511e9ee2006-05-30 17:57:14 -0400103 if (!stat)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 return 0;
105 cpufreq_stats_update(stat->cpu);
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -0700106 len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n");
107 len += snprintf(buf + len, PAGE_SIZE - len, " : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 for (i = 0; i < stat->state_num; i++) {
109 if (len >= PAGE_SIZE)
110 break;
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -0700111 len += snprintf(buf + len, PAGE_SIZE - len, "%9u ",
112 stat->freq_table[i]);
113 }
114 if (len >= PAGE_SIZE)
Cesar Eduardo Barros25aca342008-02-16 08:41:25 -0200115 return PAGE_SIZE;
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -0700116
117 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
118
119 for (i = 0; i < stat->state_num; i++) {
120 if (len >= PAGE_SIZE)
121 break;
122
123 len += snprintf(buf + len, PAGE_SIZE - len, "%9u: ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 stat->freq_table[i]);
125
126 for (j = 0; j < stat->state_num; j++) {
127 if (len >= PAGE_SIZE)
128 break;
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -0700129 len += snprintf(buf + len, PAGE_SIZE - len, "%9u ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 stat->trans_table[i*stat->max_state+j]);
131 }
Cesar Eduardo Barros25aca342008-02-16 08:41:25 -0200132 if (len >= PAGE_SIZE)
133 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
135 }
Cesar Eduardo Barros25aca342008-02-16 08:41:25 -0200136 if (len >= PAGE_SIZE)
137 return PAGE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 return len;
139}
Dave Jones0a829c52009-01-18 01:49:04 -0500140CPUFREQ_STATDEVICE_ATTR(trans_table, 0444, show_trans_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141#endif
142
Dave Jones0a829c52009-01-18 01:49:04 -0500143CPUFREQ_STATDEVICE_ATTR(total_trans, 0444, show_total_trans);
144CPUFREQ_STATDEVICE_ATTR(time_in_state, 0444, show_time_in_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
146static struct attribute *default_attrs[] = {
147 &_attr_total_trans.attr,
148 &_attr_time_in_state.attr,
149#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
150 &_attr_trans_table.attr,
151#endif
152 NULL
153};
154static struct attribute_group stats_attr_group = {
155 .attrs = default_attrs,
156 .name = "stats"
157};
158
Dave Jones0a829c52009-01-18 01:49:04 -0500159static int freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160{
161 int index;
162 for (index = 0; index < stat->max_state; index++)
163 if (stat->freq_table[index] == freq)
164 return index;
165 return -1;
166}
167
steven finney98586ed2011-05-02 11:29:17 -0700168/* should be called late in the CPU removal sequence so that the stats
169 * memory is still available in case someone tries to use it.
170 */
Adrian Bunka3323472007-12-17 16:20:03 -0800171static void cpufreq_stats_free_table(unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172{
Mike Travis7a6aedf2008-03-25 15:06:53 -0700173 struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 if (stat) {
175 kfree(stat->time_in_state);
176 kfree(stat);
177 }
Mike Travis7a6aedf2008-03-25 15:06:53 -0700178 per_cpu(cpufreq_stats_table, cpu) = NULL;
steven finney98586ed2011-05-02 11:29:17 -0700179}
180
181/* must be called early in the CPU removal sequence (before
182 * cpufreq_remove_dev) so that policy is still valid.
183 */
184static void cpufreq_stats_free_sysfs(unsigned int cpu)
185{
186 struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
187 if (policy && policy->cpu == cpu)
188 sysfs_remove_group(&policy->kobj, &stats_attr_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 if (policy)
190 cpufreq_cpu_put(policy);
191}
192
Dave Jones0a829c52009-01-18 01:49:04 -0500193static int cpufreq_stats_create_table(struct cpufreq_policy *policy,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 struct cpufreq_frequency_table *table)
195{
196 unsigned int i, j, count = 0, ret = 0;
197 struct cpufreq_stats *stat;
198 struct cpufreq_policy *data;
199 unsigned int alloc_size;
200 unsigned int cpu = policy->cpu;
Mike Travis7a6aedf2008-03-25 15:06:53 -0700201 if (per_cpu(cpufreq_stats_table, cpu))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 return -EBUSY;
Dave Jones0a829c52009-01-18 01:49:04 -0500203 stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL);
204 if ((stat) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
207 data = cpufreq_cpu_get(cpu);
Dave Jonesbc7b26f2005-10-27 16:02:06 -0700208 if (data == NULL) {
209 ret = -EINVAL;
210 goto error_get_fail;
211 }
212
Dave Jones0a829c52009-01-18 01:49:04 -0500213 ret = sysfs_create_group(&data->kobj, &stats_attr_group);
214 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 goto error_out;
216
217 stat->cpu = cpu;
Mike Travis7a6aedf2008-03-25 15:06:53 -0700218 per_cpu(cpufreq_stats_table, cpu) = stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Dave Jones0a829c52009-01-18 01:49:04 -0500220 for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 unsigned int freq = table[i].frequency;
222 if (freq == CPUFREQ_ENTRY_INVALID)
223 continue;
224 count++;
225 }
226
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -0700227 alloc_size = count * sizeof(int) + count * sizeof(cputime64_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
229#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
230 alloc_size += count * count * sizeof(int);
231#endif
232 stat->max_state = count;
Dave Jonese98df502005-10-20 15:17:43 -0700233 stat->time_in_state = kzalloc(alloc_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 if (!stat->time_in_state) {
235 ret = -ENOMEM;
236 goto error_out;
237 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 stat->freq_table = (unsigned int *)(stat->time_in_state + count);
239
240#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
241 stat->trans_table = stat->freq_table + count;
242#endif
243 j = 0;
244 for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
245 unsigned int freq = table[i].frequency;
246 if (freq == CPUFREQ_ENTRY_INVALID)
247 continue;
248 if (freq_table_get_index(stat, freq) == -1)
249 stat->freq_table[j++] = freq;
250 }
251 stat->state_num = j;
252 spin_lock(&cpufreq_stats_lock);
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -0700253 stat->last_time = get_jiffies_64();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 stat->last_index = freq_table_get_index(stat, policy->cur);
255 spin_unlock(&cpufreq_stats_lock);
256 cpufreq_cpu_put(data);
257 return 0;
258error_out:
259 cpufreq_cpu_put(data);
Dave Jonesb7fb3582005-11-01 23:13:45 -0800260error_get_fail:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 kfree(stat);
Mike Travis7a6aedf2008-03-25 15:06:53 -0700262 per_cpu(cpufreq_stats_table, cpu) = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 return ret;
264}
265
Dave Jones0a829c52009-01-18 01:49:04 -0500266static int cpufreq_stat_notifier_policy(struct notifier_block *nb,
267 unsigned long val, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268{
269 int ret;
270 struct cpufreq_policy *policy = data;
271 struct cpufreq_frequency_table *table;
272 unsigned int cpu = policy->cpu;
273 if (val != CPUFREQ_NOTIFY)
274 return 0;
275 table = cpufreq_frequency_get_table(cpu);
276 if (!table)
277 return 0;
Dave Jones0a829c52009-01-18 01:49:04 -0500278 ret = cpufreq_stats_create_table(policy, table);
279 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 return ret;
281 return 0;
282}
283
Dave Jones0a829c52009-01-18 01:49:04 -0500284static int cpufreq_stat_notifier_trans(struct notifier_block *nb,
285 unsigned long val, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286{
287 struct cpufreq_freqs *freq = data;
288 struct cpufreq_stats *stat;
289 int old_index, new_index;
290
291 if (val != CPUFREQ_POSTCHANGE)
292 return 0;
293
Mike Travis7a6aedf2008-03-25 15:06:53 -0700294 stat = per_cpu(cpufreq_stats_table, freq->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 if (!stat)
296 return 0;
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800297
Shaohua Li6501faf2008-04-27 13:46:56 -0700298 old_index = stat->last_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 new_index = freq_table_get_index(stat, freq->new);
300
Konrad Rzeszutek Wilk46a310b2011-06-16 15:36:38 -0400301 /* We can't do stat->time_in_state[-1]= .. */
302 if (old_index == -1 || new_index == -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 return 0;
304
Konrad Rzeszutek Wilk46a310b2011-06-16 15:36:38 -0400305 cpufreq_stats_update(freq->cpu);
306
307 if (old_index == new_index)
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800308 return 0;
309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 spin_lock(&cpufreq_stats_lock);
311 stat->last_index = new_index;
312#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
313 stat->trans_table[old_index * stat->max_state + new_index]++;
314#endif
315 stat->total_trans++;
316 spin_unlock(&cpufreq_stats_lock);
317 return 0;
318}
319
Satyam Sharma55395ae2007-10-02 13:28:15 -0700320static int __cpuinit cpufreq_stat_cpu_callback(struct notifier_block *nfb,
321 unsigned long action,
322 void *hcpu)
Ashok Rajc32b6b82005-10-30 14:59:54 -0800323{
324 unsigned int cpu = (unsigned long)hcpu;
325
326 switch (action) {
327 case CPU_ONLINE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700328 case CPU_ONLINE_FROZEN:
Ashok Rajc32b6b82005-10-30 14:59:54 -0800329 cpufreq_update_policy(cpu);
330 break;
steven finney98586ed2011-05-02 11:29:17 -0700331 case CPU_DOWN_PREPARE:
332 cpufreq_stats_free_sysfs(cpu);
333 break;
Ashok Rajc32b6b82005-10-30 14:59:54 -0800334 case CPU_DEAD:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700335 case CPU_DEAD_FROZEN:
Ashok Rajc32b6b82005-10-30 14:59:54 -0800336 cpufreq_stats_free_table(cpu);
337 break;
338 }
339 return NOTIFY_OK;
340}
341
steven finney98586ed2011-05-02 11:29:17 -0700342/* priority=1 so this will get called before cpufreq_remove_dev */
Karthigan Srinivasan469057d2011-04-01 17:34:47 -0500343static struct notifier_block cpufreq_stat_cpu_notifier __refdata = {
Ashok Rajc32b6b82005-10-30 14:59:54 -0800344 .notifier_call = cpufreq_stat_cpu_callback,
steven finney98586ed2011-05-02 11:29:17 -0700345 .priority = 1,
Ashok Rajc32b6b82005-10-30 14:59:54 -0800346};
347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348static struct notifier_block notifier_policy_block = {
349 .notifier_call = cpufreq_stat_notifier_policy
350};
351
352static struct notifier_block notifier_trans_block = {
353 .notifier_call = cpufreq_stat_notifier_trans
354};
355
Dave Jones0a829c52009-01-18 01:49:04 -0500356static int __init cpufreq_stats_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357{
358 int ret;
359 unsigned int cpu;
Ashok Rajc32b6b82005-10-30 14:59:54 -0800360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 spin_lock_init(&cpufreq_stats_lock);
Dave Jones0a829c52009-01-18 01:49:04 -0500362 ret = cpufreq_register_notifier(&notifier_policy_block,
363 CPUFREQ_POLICY_NOTIFIER);
364 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 return ret;
366
Dave Jones0a829c52009-01-18 01:49:04 -0500367 ret = cpufreq_register_notifier(&notifier_trans_block,
368 CPUFREQ_TRANSITION_NOTIFIER);
369 if (ret) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 cpufreq_unregister_notifier(&notifier_policy_block,
371 CPUFREQ_POLICY_NOTIFIER);
372 return ret;
373 }
374
Chandra Seetharaman65edc682006-06-27 02:54:08 -0700375 register_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
Ashok Rajc32b6b82005-10-30 14:59:54 -0800376 for_each_online_cpu(cpu) {
Satyam Sharma55395ae2007-10-02 13:28:15 -0700377 cpufreq_update_policy(cpu);
Ashok Rajc32b6b82005-10-30 14:59:54 -0800378 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 return 0;
380}
Dave Jones0a829c52009-01-18 01:49:04 -0500381static void __exit cpufreq_stats_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382{
383 unsigned int cpu;
Ashok Rajc32b6b82005-10-30 14:59:54 -0800384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 cpufreq_unregister_notifier(&notifier_policy_block,
386 CPUFREQ_POLICY_NOTIFIER);
387 cpufreq_unregister_notifier(&notifier_trans_block,
388 CPUFREQ_TRANSITION_NOTIFIER);
Chandra Seetharaman65edc682006-06-27 02:54:08 -0700389 unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
Ashok Rajc32b6b82005-10-30 14:59:54 -0800390 for_each_online_cpu(cpu) {
Satyam Sharma55395ae2007-10-02 13:28:15 -0700391 cpufreq_stats_free_table(cpu);
Dave Jones13f06752011-06-12 16:35:28 -0400392 cpufreq_stats_free_sysfs(cpu);
Ashok Rajc32b6b82005-10-30 14:59:54 -0800393 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394}
395
Dave Jones0a829c52009-01-18 01:49:04 -0500396MODULE_AUTHOR("Zou Nan hai <nanhai.zou@intel.com>");
397MODULE_DESCRIPTION("'cpufreq_stats' - A driver to export cpufreq stats "
Gautham R Shenoye08f5f52006-10-26 16:20:58 +0530398 "through sysfs filesystem");
Dave Jones0a829c52009-01-18 01:49:04 -0500399MODULE_LICENSE("GPL");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
401module_init(cpufreq_stats_init);
402module_exit(cpufreq_stats_exit);