cpufreq_stats.c (7fb1327ee9b92fca27662f9b9d60c7c3376d6c69) cpufreq_stats.c (801e0f378fe7d53f87246037bf40567277275418)
1/*
2 * drivers/cpufreq/cpufreq_stats.c
3 *
4 * Copyright (C) 2003-2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
5 * (C) 2004 Zou Nan hai <nanhai.zou@intel.com>.
6 *
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
12#include <linux/cpu.h>
13#include <linux/cpufreq.h>
14#include <linux/module.h>
15#include <linux/slab.h>
1/*
2 * drivers/cpufreq/cpufreq_stats.c
3 *
4 * Copyright (C) 2003-2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
5 * (C) 2004 Zou Nan hai <nanhai.zou@intel.com>.
6 *
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
12#include <linux/cpu.h>
13#include <linux/cpufreq.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/cputime.h>
16
17static DEFINE_SPINLOCK(cpufreq_stats_lock);
18
19struct cpufreq_stats {
20 unsigned int total_trans;
21 unsigned long long last_time;
22 unsigned int max_state;
23 unsigned int state_num;
24 unsigned int last_index;
25 u64 *time_in_state;
26 unsigned int *freq_table;
17
18static DEFINE_SPINLOCK(cpufreq_stats_lock);
19
20struct cpufreq_stats {
21 unsigned int total_trans;
22 unsigned long long last_time;
23 unsigned int max_state;
24 unsigned int state_num;
25 unsigned int last_index;
26 u64 *time_in_state;
27 unsigned int *freq_table;
27#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
28 unsigned int *trans_table;
28 unsigned int *trans_table;
29#endif
30};
31
32static int cpufreq_stats_update(struct cpufreq_stats *stats)
33{
34 unsigned long long cur_time = get_jiffies_64();
35
36 spin_lock(&cpufreq_stats_lock);
37 stats->time_in_state[stats->last_index] += cur_time - stats->last_time;
38 stats->last_time = cur_time;
39 spin_unlock(&cpufreq_stats_lock);
40 return 0;
41}
42
43static void cpufreq_stats_clear_table(struct cpufreq_stats *stats)
44{
45 unsigned int count = stats->max_state;
46
47 memset(stats->time_in_state, 0, count * sizeof(u64));
29};
30
31static int cpufreq_stats_update(struct cpufreq_stats *stats)
32{
33 unsigned long long cur_time = get_jiffies_64();
34
35 spin_lock(&cpufreq_stats_lock);
36 stats->time_in_state[stats->last_index] += cur_time - stats->last_time;
37 stats->last_time = cur_time;
38 spin_unlock(&cpufreq_stats_lock);
39 return 0;
40}
41
42static void cpufreq_stats_clear_table(struct cpufreq_stats *stats)
43{
44 unsigned int count = stats->max_state;
45
46 memset(stats->time_in_state, 0, count * sizeof(u64));
48#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
49 memset(stats->trans_table, 0, count * count * sizeof(int));
47 memset(stats->trans_table, 0, count * count * sizeof(int));
50#endif
51 stats->last_time = get_jiffies_64();
52 stats->total_trans = 0;
53}
54
55static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf)
56{
57 return sprintf(buf, "%d\n", policy->stats->total_trans);
58}

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78static ssize_t store_reset(struct cpufreq_policy *policy, const char *buf,
79 size_t count)
80{
81 /* We don't care what is written to the attribute. */
82 cpufreq_stats_clear_table(policy->stats);
83 return count;
84}
85
48 stats->last_time = get_jiffies_64();
49 stats->total_trans = 0;
50}
51
52static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf)
53{
54 return sprintf(buf, "%d\n", policy->stats->total_trans);
55}

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75static ssize_t store_reset(struct cpufreq_policy *policy, const char *buf,
76 size_t count)
77{
78 /* We don't care what is written to the attribute. */
79 cpufreq_stats_clear_table(policy->stats);
80 return count;
81}
82
86#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
87static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
88{
89 struct cpufreq_stats *stats = policy->stats;
90 ssize_t len = 0;
91 int i, j;
92
93 if (policy->fast_switch_enabled)
94 return 0;

--- 28 unchanged lines hidden (view full) ---

123 break;
124 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
125 }
126 if (len >= PAGE_SIZE)
127 return PAGE_SIZE;
128 return len;
129}
130cpufreq_freq_attr_ro(trans_table);
83static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
84{
85 struct cpufreq_stats *stats = policy->stats;
86 ssize_t len = 0;
87 int i, j;
88
89 if (policy->fast_switch_enabled)
90 return 0;

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119 break;
120 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
121 }
122 if (len >= PAGE_SIZE)
123 return PAGE_SIZE;
124 return len;
125}
126cpufreq_freq_attr_ro(trans_table);
131#endif
132
133cpufreq_freq_attr_ro(total_trans);
134cpufreq_freq_attr_ro(time_in_state);
135cpufreq_freq_attr_wo(reset);
136
137static struct attribute *default_attrs[] = {
138 &total_trans.attr,
139 &time_in_state.attr,
140 &reset.attr,
127
128cpufreq_freq_attr_ro(total_trans);
129cpufreq_freq_attr_ro(time_in_state);
130cpufreq_freq_attr_wo(reset);
131
132static struct attribute *default_attrs[] = {
133 &total_trans.attr,
134 &time_in_state.attr,
135 &reset.attr,
141#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
142 &trans_table.attr,
136 &trans_table.attr,
143#endif
144 NULL
145};
146static struct attribute_group stats_attr_group = {
147 .attrs = default_attrs,
148 .name = "stats"
149};
150
151static int freq_table_get_index(struct cpufreq_stats *stats, unsigned int freq)

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194 return;
195
196 /* Find total allocation size */
197 cpufreq_for_each_valid_entry(pos, table)
198 count++;
199
200 alloc_size = count * sizeof(int) + count * sizeof(u64);
201
137 NULL
138};
139static struct attribute_group stats_attr_group = {
140 .attrs = default_attrs,
141 .name = "stats"
142};
143
144static int freq_table_get_index(struct cpufreq_stats *stats, unsigned int freq)

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187 return;
188
189 /* Find total allocation size */
190 cpufreq_for_each_valid_entry(pos, table)
191 count++;
192
193 alloc_size = count * sizeof(int) + count * sizeof(u64);
194
202#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
203 alloc_size += count * count * sizeof(int);
195 alloc_size += count * count * sizeof(int);
204#endif
205
206 /* Allocate memory for time_in_state/freq_table/trans_table in one go */
207 stats->time_in_state = kzalloc(alloc_size, GFP_KERNEL);
208 if (!stats->time_in_state)
209 goto free_stat;
210
211 stats->freq_table = (unsigned int *)(stats->time_in_state + count);
212
196
197 /* Allocate memory for time_in_state/freq_table/trans_table in one go */
198 stats->time_in_state = kzalloc(alloc_size, GFP_KERNEL);
199 if (!stats->time_in_state)
200 goto free_stat;
201
202 stats->freq_table = (unsigned int *)(stats->time_in_state + count);
203
213#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
214 stats->trans_table = stats->freq_table + count;
204 stats->trans_table = stats->freq_table + count;
215#endif
216
217 stats->max_state = count;
218
219 /* Find valid-unique entries */
220 cpufreq_for_each_valid_entry(pos, table)
221 if (freq_table_get_index(stats, pos->frequency) == -1)
222 stats->freq_table[i++] = pos->frequency;
223

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253
254 /* We can't do stats->time_in_state[-1]= .. */
255 if (old_index == -1 || new_index == -1 || old_index == new_index)
256 return;
257
258 cpufreq_stats_update(stats);
259
260 stats->last_index = new_index;
205
206 stats->max_state = count;
207
208 /* Find valid-unique entries */
209 cpufreq_for_each_valid_entry(pos, table)
210 if (freq_table_get_index(stats, pos->frequency) == -1)
211 stats->freq_table[i++] = pos->frequency;
212

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242
243 /* We can't do stats->time_in_state[-1]= .. */
244 if (old_index == -1 || new_index == -1 || old_index == new_index)
245 return;
246
247 cpufreq_stats_update(stats);
248
249 stats->last_index = new_index;
261#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
262 stats->trans_table[old_index * stats->max_state + new_index]++;
250 stats->trans_table[old_index * stats->max_state + new_index]++;
263#endif
264 stats->total_trans++;
265}
251 stats->total_trans++;
252}