blob: 9d7732b810445f6b73318e574924b6bed6ac6829 [file] [log] [blame]
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/cpu.h>
15#include <linux/sysfs.h>
16#include <linux/cpufreq.h>
Paul Gortmaker5c720d372011-05-27 13:23:32 -040017#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#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;
Viresh Kumar1e7586a2012-10-26 00:51:21 +020040 u64 *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)
Martin Schwidefsky64861632011-12-15 14:56:09 +010063 stat->time_in_state[stat->last_index] +=
64 cur_time - stat->last_time;
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -070065 stat->last_time = cur_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 spin_unlock(&cpufreq_stats_lock);
67 return 0;
68}
69
Dave Jones0a829c52009-01-18 01:49:04 -050070static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
Mike Travis7a6aedf2008-03-25 15:06:53 -070072 struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
Dave Jones511e9ee2006-05-30 17:57:14 -040073 if (!stat)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 return 0;
75 return sprintf(buf, "%d\n",
Mike Travis7a6aedf2008-03-25 15:06:53 -070076 per_cpu(cpufreq_stats_table, stat->cpu)->total_trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077}
78
Dave Jones0a829c52009-01-18 01:49:04 -050079static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080{
81 ssize_t len = 0;
82 int i;
Mike Travis7a6aedf2008-03-25 15:06:53 -070083 struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
Dave Jones511e9ee2006-05-30 17:57:14 -040084 if (!stat)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 return 0;
86 cpufreq_stats_update(stat->cpu);
87 for (i = 0; i < stat->state_num; i++) {
Dave Jones32ee8c32006-02-28 00:43:23 -050088 len += sprintf(buf + len, "%u %llu\n", stat->freq_table[i],
Dave Jones0a829c52009-01-18 01:49:04 -050089 (unsigned long long)
90 cputime64_to_clock_t(stat->time_in_state[i]));
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 }
92 return len;
93}
94
95#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
Dave Jones0a829c52009-01-18 01:49:04 -050096static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097{
98 ssize_t len = 0;
99 int i, j;
100
Mike Travis7a6aedf2008-03-25 15:06:53 -0700101 struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
Dave Jones511e9ee2006-05-30 17:57:14 -0400102 if (!stat)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 return 0;
104 cpufreq_stats_update(stat->cpu);
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -0700105 len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n");
106 len += snprintf(buf + len, PAGE_SIZE - len, " : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 for (i = 0; i < stat->state_num; i++) {
108 if (len >= PAGE_SIZE)
109 break;
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -0700110 len += snprintf(buf + len, PAGE_SIZE - len, "%9u ",
111 stat->freq_table[i]);
112 }
113 if (len >= PAGE_SIZE)
Cesar Eduardo Barros25aca342008-02-16 08:41:25 -0200114 return PAGE_SIZE;
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -0700115
116 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
117
118 for (i = 0; i < stat->state_num; i++) {
119 if (len >= PAGE_SIZE)
120 break;
121
122 len += snprintf(buf + len, PAGE_SIZE - len, "%9u: ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 stat->freq_table[i]);
124
125 for (j = 0; j < stat->state_num; j++) {
126 if (len >= PAGE_SIZE)
127 break;
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -0700128 len += snprintf(buf + len, PAGE_SIZE - len, "%9u ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 stat->trans_table[i*stat->max_state+j]);
130 }
Cesar Eduardo Barros25aca342008-02-16 08:41:25 -0200131 if (len >= PAGE_SIZE)
132 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
134 }
Cesar Eduardo Barros25aca342008-02-16 08:41:25 -0200135 if (len >= PAGE_SIZE)
136 return PAGE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 return len;
138}
Dave Jones0a829c52009-01-18 01:49:04 -0500139CPUFREQ_STATDEVICE_ATTR(trans_table, 0444, show_trans_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140#endif
141
Dave Jones0a829c52009-01-18 01:49:04 -0500142CPUFREQ_STATDEVICE_ATTR(total_trans, 0444, show_total_trans);
143CPUFREQ_STATDEVICE_ATTR(time_in_state, 0444, show_time_in_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
145static struct attribute *default_attrs[] = {
146 &_attr_total_trans.attr,
147 &_attr_time_in_state.attr,
148#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
149 &_attr_trans_table.attr,
150#endif
151 NULL
152};
153static struct attribute_group stats_attr_group = {
154 .attrs = default_attrs,
155 .name = "stats"
156};
157
Dave Jones0a829c52009-01-18 01:49:04 -0500158static int freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
160 int index;
161 for (index = 0; index < stat->max_state; index++)
162 if (stat->freq_table[index] == freq)
163 return index;
164 return -1;
165}
166
steven finney98586ed2011-05-02 11:29:17 -0700167/* should be called late in the CPU removal sequence so that the stats
168 * memory is still available in case someone tries to use it.
169 */
Adrian Bunka3323472007-12-17 16:20:03 -0800170static void cpufreq_stats_free_table(unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171{
Mike Travis7a6aedf2008-03-25 15:06:53 -0700172 struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 if (stat) {
174 kfree(stat->time_in_state);
175 kfree(stat);
176 }
Mike Travis7a6aedf2008-03-25 15:06:53 -0700177 per_cpu(cpufreq_stats_table, cpu) = NULL;
steven finney98586ed2011-05-02 11:29:17 -0700178}
179
180/* must be called early in the CPU removal sequence (before
181 * cpufreq_remove_dev) so that policy is still valid.
182 */
183static void cpufreq_stats_free_sysfs(unsigned int cpu)
184{
185 struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
186 if (policy && policy->cpu == cpu)
187 sysfs_remove_group(&policy->kobj, &stats_attr_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 if (policy)
189 cpufreq_cpu_put(policy);
190}
191
Dave Jones0a829c52009-01-18 01:49:04 -0500192static int cpufreq_stats_create_table(struct cpufreq_policy *policy,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 struct cpufreq_frequency_table *table)
194{
195 unsigned int i, j, count = 0, ret = 0;
196 struct cpufreq_stats *stat;
197 struct cpufreq_policy *data;
198 unsigned int alloc_size;
199 unsigned int cpu = policy->cpu;
Mike Travis7a6aedf2008-03-25 15:06:53 -0700200 if (per_cpu(cpufreq_stats_table, cpu))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 return -EBUSY;
Dave Jones0a829c52009-01-18 01:49:04 -0500202 stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL);
203 if ((stat) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
206 data = cpufreq_cpu_get(cpu);
Dave Jonesbc7b26f2005-10-27 16:02:06 -0700207 if (data == NULL) {
208 ret = -EINVAL;
209 goto error_get_fail;
210 }
211
Dave Jones0a829c52009-01-18 01:49:04 -0500212 ret = sysfs_create_group(&data->kobj, &stats_attr_group);
213 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 goto error_out;
215
216 stat->cpu = cpu;
Mike Travis7a6aedf2008-03-25 15:06:53 -0700217 per_cpu(cpufreq_stats_table, cpu) = stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Dave Jones0a829c52009-01-18 01:49:04 -0500219 for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 unsigned int freq = table[i].frequency;
221 if (freq == CPUFREQ_ENTRY_INVALID)
222 continue;
223 count++;
224 }
225
Viresh Kumar1e7586a2012-10-26 00:51:21 +0200226 alloc_size = count * sizeof(int) + count * sizeof(u64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
229 alloc_size += count * count * sizeof(int);
230#endif
231 stat->max_state = count;
Dave Jonese98df502005-10-20 15:17:43 -0700232 stat->time_in_state = kzalloc(alloc_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 if (!stat->time_in_state) {
234 ret = -ENOMEM;
235 goto error_out;
236 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 stat->freq_table = (unsigned int *)(stat->time_in_state + count);
238
239#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
240 stat->trans_table = stat->freq_table + count;
241#endif
242 j = 0;
243 for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
244 unsigned int freq = table[i].frequency;
245 if (freq == CPUFREQ_ENTRY_INVALID)
246 continue;
247 if (freq_table_get_index(stat, freq) == -1)
248 stat->freq_table[j++] = freq;
249 }
250 stat->state_num = j;
251 spin_lock(&cpufreq_stats_lock);
Venkatesh Pallipadi58f1df22005-05-25 14:46:50 -0700252 stat->last_time = get_jiffies_64();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 stat->last_index = freq_table_get_index(stat, policy->cur);
254 spin_unlock(&cpufreq_stats_lock);
255 cpufreq_cpu_put(data);
256 return 0;
257error_out:
258 cpufreq_cpu_put(data);
Dave Jonesb7fb3582005-11-01 23:13:45 -0800259error_get_fail:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 kfree(stat);
Mike Travis7a6aedf2008-03-25 15:06:53 -0700261 per_cpu(cpufreq_stats_table, cpu) = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 return ret;
263}
264
Dave Jones0a829c52009-01-18 01:49:04 -0500265static int cpufreq_stat_notifier_policy(struct notifier_block *nb,
266 unsigned long val, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267{
268 int ret;
269 struct cpufreq_policy *policy = data;
270 struct cpufreq_frequency_table *table;
271 unsigned int cpu = policy->cpu;
272 if (val != CPUFREQ_NOTIFY)
273 return 0;
274 table = cpufreq_frequency_get_table(cpu);
275 if (!table)
276 return 0;
Dave Jones0a829c52009-01-18 01:49:04 -0500277 ret = cpufreq_stats_create_table(policy, table);
278 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 return ret;
280 return 0;
281}
282
Dave Jones0a829c52009-01-18 01:49:04 -0500283static int cpufreq_stat_notifier_trans(struct notifier_block *nb,
284 unsigned long val, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285{
286 struct cpufreq_freqs *freq = data;
287 struct cpufreq_stats *stat;
288 int old_index, new_index;
289
290 if (val != CPUFREQ_POSTCHANGE)
291 return 0;
292
Mike Travis7a6aedf2008-03-25 15:06:53 -0700293 stat = per_cpu(cpufreq_stats_table, freq->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 if (!stat)
295 return 0;
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800296
Shaohua Li6501faf2008-04-27 13:46:56 -0700297 old_index = stat->last_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 new_index = freq_table_get_index(stat, freq->new);
299
Konrad Rzeszutek Wilk46a310b2011-06-16 15:36:38 -0400300 /* We can't do stat->time_in_state[-1]= .. */
301 if (old_index == -1 || new_index == -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 return 0;
303
Konrad Rzeszutek Wilk46a310b2011-06-16 15:36:38 -0400304 cpufreq_stats_update(freq->cpu);
305
306 if (old_index == new_index)
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800307 return 0;
308
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 spin_lock(&cpufreq_stats_lock);
310 stat->last_index = new_index;
311#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
312 stat->trans_table[old_index * stat->max_state + new_index]++;
313#endif
314 stat->total_trans++;
315 spin_unlock(&cpufreq_stats_lock);
316 return 0;
317}
318
Satyam Sharma55395ae2007-10-02 13:28:15 -0700319static int __cpuinit cpufreq_stat_cpu_callback(struct notifier_block *nfb,
320 unsigned long action,
321 void *hcpu)
Ashok Rajc32b6b82005-10-30 14:59:54 -0800322{
323 unsigned int cpu = (unsigned long)hcpu;
324
325 switch (action) {
326 case CPU_ONLINE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700327 case CPU_ONLINE_FROZEN:
Ashok Rajc32b6b82005-10-30 14:59:54 -0800328 cpufreq_update_policy(cpu);
329 break;
steven finney98586ed2011-05-02 11:29:17 -0700330 case CPU_DOWN_PREPARE:
Tu, Xiaobinge3773672012-10-23 01:03:00 +0200331 case CPU_DOWN_PREPARE_FROZEN:
steven finney98586ed2011-05-02 11:29:17 -0700332 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
Konstantin Khlebnikov56836fb2012-12-15 00:22:02 +0100367 register_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
368 for_each_online_cpu(cpu)
369 cpufreq_update_policy(cpu);
370
Dave Jones0a829c52009-01-18 01:49:04 -0500371 ret = cpufreq_register_notifier(&notifier_trans_block,
372 CPUFREQ_TRANSITION_NOTIFIER);
373 if (ret) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 cpufreq_unregister_notifier(&notifier_policy_block,
375 CPUFREQ_POLICY_NOTIFIER);
Konstantin Khlebnikov56836fb2012-12-15 00:22:02 +0100376 unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
377 for_each_online_cpu(cpu)
378 cpufreq_stats_free_table(cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 return ret;
380 }
381
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 return 0;
383}
Dave Jones0a829c52009-01-18 01:49:04 -0500384static void __exit cpufreq_stats_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385{
386 unsigned int cpu;
Ashok Rajc32b6b82005-10-30 14:59:54 -0800387
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 cpufreq_unregister_notifier(&notifier_policy_block,
389 CPUFREQ_POLICY_NOTIFIER);
390 cpufreq_unregister_notifier(&notifier_trans_block,
391 CPUFREQ_TRANSITION_NOTIFIER);
Chandra Seetharaman65edc682006-06-27 02:54:08 -0700392 unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
Ashok Rajc32b6b82005-10-30 14:59:54 -0800393 for_each_online_cpu(cpu) {
Satyam Sharma55395ae2007-10-02 13:28:15 -0700394 cpufreq_stats_free_table(cpu);
Dave Jones13f06752011-06-12 16:35:28 -0400395 cpufreq_stats_free_sysfs(cpu);
Ashok Rajc32b6b82005-10-30 14:59:54 -0800396 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397}
398
Dave Jones0a829c52009-01-18 01:49:04 -0500399MODULE_AUTHOR("Zou Nan hai <nanhai.zou@intel.com>");
400MODULE_DESCRIPTION("'cpufreq_stats' - A driver to export cpufreq stats "
Gautham R Shenoye08f5f52006-10-26 16:20:58 +0530401 "through sysfs filesystem");
Dave Jones0a829c52009-01-18 01:49:04 -0500402MODULE_LICENSE("GPL");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
404module_init(cpufreq_stats_init);
405module_exit(cpufreq_stats_exit);