Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 1 | /* drivers/cpufreq/cpufreq_times.c |
| 2 | * |
| 3 | * Copyright (C) 2018 Google, Inc. |
| 4 | * |
| 5 | * This software is licensed under the terms of the GNU General Public |
| 6 | * License version 2, as published by the Free Software Foundation, and |
| 7 | * may be copied, distributed, and modified under those terms. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/cpufreq.h> |
| 17 | #include <linux/cpufreq_times.h> |
| 18 | #include <linux/cputime.h> |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 19 | #include <linux/hashtable.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/proc_fs.h> |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 22 | #include <linux/sched.h> |
| 23 | #include <linux/seq_file.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/spinlock.h> |
| 26 | #include <linux/threads.h> |
| 27 | |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 28 | #define UID_HASH_BITS 10 |
| 29 | |
| 30 | static DECLARE_HASHTABLE(uid_hash_table, UID_HASH_BITS); |
| 31 | |
Tengfei Fan | bfea4ae | 2019-04-18 13:55:38 +0800 | [diff] [blame] | 32 | /* task->time_in_state */ |
| 33 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(task_time_in_state_lock); |
| 34 | /* uid_hash_table */ |
| 35 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(uid_lock); |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 36 | |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 37 | struct concurrent_times { |
| 38 | atomic64_t active[NR_CPUS]; |
| 39 | atomic64_t policy[NR_CPUS]; |
| 40 | }; |
| 41 | |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 42 | struct uid_entry { |
| 43 | uid_t uid; |
| 44 | unsigned int max_state; |
| 45 | struct hlist_node hash; |
| 46 | struct rcu_head rcu; |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 47 | struct concurrent_times *concurrent_times; |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 48 | u64 time_in_state[0]; |
| 49 | }; |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 50 | |
| 51 | /** |
| 52 | * struct cpu_freqs - per-cpu frequency information |
| 53 | * @offset: start of these freqs' stats in task time_in_state array |
| 54 | * @max_state: number of entries in freq_table |
| 55 | * @last_index: index in freq_table of last frequency switched to |
| 56 | * @freq_table: list of available frequencies |
| 57 | */ |
| 58 | struct cpu_freqs { |
| 59 | unsigned int offset; |
| 60 | unsigned int max_state; |
| 61 | unsigned int last_index; |
| 62 | unsigned int freq_table[0]; |
| 63 | }; |
| 64 | |
| 65 | static struct cpu_freqs *all_freqs[NR_CPUS]; |
| 66 | |
| 67 | static unsigned int next_offset; |
| 68 | |
Connor O'Brien | f17f4fb | 2018-01-22 18:28:08 -0800 | [diff] [blame] | 69 | |
| 70 | /* Caller must hold rcu_read_lock() */ |
| 71 | static struct uid_entry *find_uid_entry_rcu(uid_t uid) |
| 72 | { |
| 73 | struct uid_entry *uid_entry; |
| 74 | |
| 75 | hash_for_each_possible_rcu(uid_hash_table, uid_entry, hash, uid) { |
| 76 | if (uid_entry->uid == uid) |
| 77 | return uid_entry; |
| 78 | } |
| 79 | return NULL; |
| 80 | } |
| 81 | |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 82 | /* Caller must hold uid lock */ |
| 83 | static struct uid_entry *find_uid_entry_locked(uid_t uid) |
| 84 | { |
| 85 | struct uid_entry *uid_entry; |
| 86 | |
| 87 | hash_for_each_possible(uid_hash_table, uid_entry, hash, uid) { |
| 88 | if (uid_entry->uid == uid) |
| 89 | return uid_entry; |
| 90 | } |
| 91 | return NULL; |
| 92 | } |
| 93 | |
| 94 | /* Caller must hold uid lock */ |
| 95 | static struct uid_entry *find_or_register_uid_locked(uid_t uid) |
| 96 | { |
| 97 | struct uid_entry *uid_entry, *temp; |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 98 | struct concurrent_times *times; |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 99 | unsigned int max_state = READ_ONCE(next_offset); |
| 100 | size_t alloc_size = sizeof(*uid_entry) + max_state * |
| 101 | sizeof(uid_entry->time_in_state[0]); |
| 102 | |
| 103 | uid_entry = find_uid_entry_locked(uid); |
| 104 | if (uid_entry) { |
| 105 | if (uid_entry->max_state == max_state) |
| 106 | return uid_entry; |
| 107 | /* uid_entry->time_in_state is too small to track all freqs, so |
| 108 | * expand it. |
| 109 | */ |
| 110 | temp = __krealloc(uid_entry, alloc_size, GFP_ATOMIC); |
| 111 | if (!temp) |
| 112 | return uid_entry; |
| 113 | temp->max_state = max_state; |
| 114 | memset(temp->time_in_state + uid_entry->max_state, 0, |
| 115 | (max_state - uid_entry->max_state) * |
| 116 | sizeof(uid_entry->time_in_state[0])); |
| 117 | if (temp != uid_entry) { |
| 118 | hlist_replace_rcu(&uid_entry->hash, &temp->hash); |
| 119 | kfree_rcu(uid_entry, rcu); |
| 120 | } |
| 121 | return temp; |
| 122 | } |
| 123 | |
| 124 | uid_entry = kzalloc(alloc_size, GFP_ATOMIC); |
| 125 | if (!uid_entry) |
| 126 | return NULL; |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 127 | times = kzalloc(sizeof(*times), GFP_ATOMIC); |
| 128 | if (!times) { |
| 129 | kfree(uid_entry); |
| 130 | return NULL; |
| 131 | } |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 132 | |
| 133 | uid_entry->uid = uid; |
| 134 | uid_entry->max_state = max_state; |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 135 | uid_entry->concurrent_times = times; |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 136 | |
| 137 | hash_add_rcu(uid_hash_table, &uid_entry->hash, uid); |
| 138 | |
| 139 | return uid_entry; |
| 140 | } |
| 141 | |
Connor O'Brien | f17f4fb | 2018-01-22 18:28:08 -0800 | [diff] [blame] | 142 | static int single_uid_time_in_state_show(struct seq_file *m, void *ptr) |
| 143 | { |
| 144 | struct uid_entry *uid_entry; |
| 145 | unsigned int i; |
Connor O'Brien | f17f4fb | 2018-01-22 18:28:08 -0800 | [diff] [blame] | 146 | uid_t uid = from_kuid_munged(current_user_ns(), *(kuid_t *)m->private); |
| 147 | |
| 148 | if (uid == overflowuid) |
| 149 | return -EINVAL; |
| 150 | |
| 151 | rcu_read_lock(); |
| 152 | |
| 153 | uid_entry = find_uid_entry_rcu(uid); |
| 154 | if (!uid_entry) { |
| 155 | rcu_read_unlock(); |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | for (i = 0; i < uid_entry->max_state; ++i) { |
Connor O'Brien | 3f33df2 | 2019-03-01 15:40:30 -0800 | [diff] [blame] | 160 | u64 time = cputime_to_clock_t(uid_entry->time_in_state[i]); |
Connor O'Brien | f17f4fb | 2018-01-22 18:28:08 -0800 | [diff] [blame] | 161 | seq_write(m, &time, sizeof(time)); |
| 162 | } |
| 163 | |
| 164 | rcu_read_unlock(); |
| 165 | |
| 166 | return 0; |
| 167 | } |
| 168 | |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 169 | static void *uid_seq_start(struct seq_file *seq, loff_t *pos) |
| 170 | { |
| 171 | if (*pos >= HASH_SIZE(uid_hash_table)) |
| 172 | return NULL; |
| 173 | |
| 174 | return &uid_hash_table[*pos]; |
| 175 | } |
| 176 | |
| 177 | static void *uid_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 178 | { |
Connor O'Brien | c68876d | 2019-02-20 12:17:48 -0800 | [diff] [blame] | 179 | do { |
| 180 | (*pos)++; |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 181 | |
Connor O'Brien | c68876d | 2019-02-20 12:17:48 -0800 | [diff] [blame] | 182 | if (*pos >= HASH_SIZE(uid_hash_table)) |
| 183 | return NULL; |
| 184 | } while (hlist_empty(&uid_hash_table[*pos])); |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 185 | |
| 186 | return &uid_hash_table[*pos]; |
| 187 | } |
| 188 | |
| 189 | static void uid_seq_stop(struct seq_file *seq, void *v) { } |
| 190 | |
| 191 | static int uid_time_in_state_seq_show(struct seq_file *m, void *v) |
| 192 | { |
| 193 | struct uid_entry *uid_entry; |
| 194 | struct cpu_freqs *freqs, *last_freqs = NULL; |
| 195 | int i, cpu; |
| 196 | |
| 197 | if (v == uid_hash_table) { |
| 198 | seq_puts(m, "uid:"); |
| 199 | for_each_possible_cpu(cpu) { |
| 200 | freqs = all_freqs[cpu]; |
| 201 | if (!freqs || freqs == last_freqs) |
| 202 | continue; |
| 203 | last_freqs = freqs; |
Connor O'Brien | 7cd9561 | 2018-04-03 16:05:37 -0700 | [diff] [blame] | 204 | for (i = 0; i < freqs->max_state; i++) { |
Connor O'Brien | c68876d | 2019-02-20 12:17:48 -0800 | [diff] [blame] | 205 | seq_put_decimal_ull(m, " ", |
| 206 | freqs->freq_table[i]); |
Connor O'Brien | 7cd9561 | 2018-04-03 16:05:37 -0700 | [diff] [blame] | 207 | } |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 208 | } |
| 209 | seq_putc(m, '\n'); |
| 210 | } |
| 211 | |
| 212 | rcu_read_lock(); |
| 213 | |
| 214 | hlist_for_each_entry_rcu(uid_entry, (struct hlist_head *)v, hash) { |
Connor O'Brien | c68876d | 2019-02-20 12:17:48 -0800 | [diff] [blame] | 215 | if (uid_entry->max_state) { |
| 216 | seq_put_decimal_ull(m, "", uid_entry->uid); |
| 217 | seq_putc(m, ':'); |
| 218 | } |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 219 | for (i = 0; i < uid_entry->max_state; ++i) { |
Connor O'Brien | 3f33df2 | 2019-03-01 15:40:30 -0800 | [diff] [blame] | 220 | u64 time = |
| 221 | cputime_to_clock_t(uid_entry->time_in_state[i]); |
Connor O'Brien | c68876d | 2019-02-20 12:17:48 -0800 | [diff] [blame] | 222 | seq_put_decimal_ull(m, " ", time); |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 223 | } |
| 224 | if (uid_entry->max_state) |
| 225 | seq_putc(m, '\n'); |
| 226 | } |
| 227 | |
| 228 | rcu_read_unlock(); |
| 229 | return 0; |
| 230 | } |
| 231 | |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 232 | static int concurrent_time_seq_show(struct seq_file *m, void *v, |
| 233 | atomic64_t *(*get_times)(struct concurrent_times *)) |
| 234 | { |
| 235 | struct uid_entry *uid_entry; |
| 236 | int i, num_possible_cpus = num_possible_cpus(); |
| 237 | |
| 238 | rcu_read_lock(); |
| 239 | |
| 240 | hlist_for_each_entry_rcu(uid_entry, (struct hlist_head *)v, hash) { |
| 241 | atomic64_t *times = get_times(uid_entry->concurrent_times); |
| 242 | |
| 243 | seq_put_decimal_ull(m, "", (u64)uid_entry->uid); |
| 244 | seq_putc(m, ':'); |
| 245 | |
| 246 | for (i = 0; i < num_possible_cpus; ++i) { |
| 247 | u64 time = cputime_to_clock_t(atomic64_read(×[i])); |
| 248 | |
| 249 | seq_put_decimal_ull(m, " ", time); |
| 250 | } |
| 251 | seq_putc(m, '\n'); |
| 252 | } |
| 253 | |
| 254 | rcu_read_unlock(); |
| 255 | |
| 256 | return 0; |
| 257 | } |
| 258 | |
| 259 | static inline atomic64_t *get_active_times(struct concurrent_times *times) |
| 260 | { |
| 261 | return times->active; |
| 262 | } |
| 263 | |
| 264 | static int concurrent_active_time_seq_show(struct seq_file *m, void *v) |
| 265 | { |
| 266 | if (v == uid_hash_table) { |
| 267 | seq_put_decimal_ull(m, "cpus: ", num_possible_cpus()); |
| 268 | seq_putc(m, '\n'); |
| 269 | } |
| 270 | |
| 271 | return concurrent_time_seq_show(m, v, get_active_times); |
| 272 | } |
| 273 | |
| 274 | static inline atomic64_t *get_policy_times(struct concurrent_times *times) |
| 275 | { |
| 276 | return times->policy; |
| 277 | } |
| 278 | |
| 279 | static int concurrent_policy_time_seq_show(struct seq_file *m, void *v) |
| 280 | { |
| 281 | int i; |
| 282 | struct cpu_freqs *freqs, *last_freqs = NULL; |
| 283 | |
| 284 | if (v == uid_hash_table) { |
| 285 | int cnt = 0; |
| 286 | |
| 287 | for_each_possible_cpu(i) { |
| 288 | freqs = all_freqs[i]; |
| 289 | if (!freqs) |
| 290 | continue; |
| 291 | if (freqs != last_freqs) { |
| 292 | if (last_freqs) { |
| 293 | seq_put_decimal_ull(m, ": ", cnt); |
| 294 | seq_putc(m, ' '); |
| 295 | cnt = 0; |
| 296 | } |
| 297 | seq_put_decimal_ull(m, "policy", i); |
| 298 | |
| 299 | last_freqs = freqs; |
| 300 | } |
| 301 | cnt++; |
| 302 | } |
| 303 | if (last_freqs) { |
| 304 | seq_put_decimal_ull(m, ": ", cnt); |
| 305 | seq_putc(m, '\n'); |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | return concurrent_time_seq_show(m, v, get_policy_times); |
| 310 | } |
| 311 | |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 312 | void cpufreq_task_times_init(struct task_struct *p) |
| 313 | { |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 314 | unsigned long flags; |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 315 | |
| 316 | spin_lock_irqsave(&task_time_in_state_lock, flags); |
| 317 | p->time_in_state = NULL; |
| 318 | spin_unlock_irqrestore(&task_time_in_state_lock, flags); |
| 319 | p->max_state = 0; |
Sultan Alsawaf | 47bbcd6 | 2018-06-03 10:47:51 -0700 | [diff] [blame] | 320 | } |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 321 | |
Sultan Alsawaf | 47bbcd6 | 2018-06-03 10:47:51 -0700 | [diff] [blame] | 322 | void cpufreq_task_times_alloc(struct task_struct *p) |
| 323 | { |
| 324 | void *temp; |
| 325 | unsigned long flags; |
| 326 | unsigned int max_state = READ_ONCE(next_offset); |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 327 | |
| 328 | /* We use one array to avoid multiple allocs per task */ |
| 329 | temp = kcalloc(max_state, sizeof(p->time_in_state[0]), GFP_ATOMIC); |
| 330 | if (!temp) |
| 331 | return; |
| 332 | |
| 333 | spin_lock_irqsave(&task_time_in_state_lock, flags); |
| 334 | p->time_in_state = temp; |
| 335 | spin_unlock_irqrestore(&task_time_in_state_lock, flags); |
| 336 | p->max_state = max_state; |
| 337 | } |
| 338 | |
| 339 | /* Caller must hold task_time_in_state_lock */ |
| 340 | static int cpufreq_task_times_realloc_locked(struct task_struct *p) |
| 341 | { |
| 342 | void *temp; |
| 343 | unsigned int max_state = READ_ONCE(next_offset); |
| 344 | |
| 345 | temp = krealloc(p->time_in_state, max_state * sizeof(u64), GFP_ATOMIC); |
| 346 | if (!temp) |
| 347 | return -ENOMEM; |
| 348 | p->time_in_state = temp; |
| 349 | memset(p->time_in_state + p->max_state, 0, |
| 350 | (max_state - p->max_state) * sizeof(u64)); |
| 351 | p->max_state = max_state; |
| 352 | return 0; |
| 353 | } |
| 354 | |
| 355 | void cpufreq_task_times_exit(struct task_struct *p) |
| 356 | { |
| 357 | unsigned long flags; |
| 358 | void *temp; |
| 359 | |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 360 | if (!p->time_in_state) |
| 361 | return; |
| 362 | |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 363 | spin_lock_irqsave(&task_time_in_state_lock, flags); |
| 364 | temp = p->time_in_state; |
| 365 | p->time_in_state = NULL; |
| 366 | spin_unlock_irqrestore(&task_time_in_state_lock, flags); |
| 367 | kfree(temp); |
| 368 | } |
| 369 | |
| 370 | int proc_time_in_state_show(struct seq_file *m, struct pid_namespace *ns, |
| 371 | struct pid *pid, struct task_struct *p) |
| 372 | { |
| 373 | unsigned int cpu, i; |
| 374 | cputime_t cputime; |
| 375 | unsigned long flags; |
| 376 | struct cpu_freqs *freqs; |
| 377 | struct cpu_freqs *last_freqs = NULL; |
| 378 | |
| 379 | spin_lock_irqsave(&task_time_in_state_lock, flags); |
| 380 | for_each_possible_cpu(cpu) { |
| 381 | freqs = all_freqs[cpu]; |
| 382 | if (!freqs || freqs == last_freqs) |
| 383 | continue; |
| 384 | last_freqs = freqs; |
| 385 | |
| 386 | seq_printf(m, "cpu%u\n", cpu); |
| 387 | for (i = 0; i < freqs->max_state; i++) { |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 388 | cputime = 0; |
| 389 | if (freqs->offset + i < p->max_state && |
| 390 | p->time_in_state) |
| 391 | cputime = p->time_in_state[freqs->offset + i]; |
| 392 | seq_printf(m, "%u %lu\n", freqs->freq_table[i], |
| 393 | (unsigned long)cputime_to_clock_t(cputime)); |
| 394 | } |
| 395 | } |
| 396 | spin_unlock_irqrestore(&task_time_in_state_lock, flags); |
| 397 | return 0; |
| 398 | } |
| 399 | |
| 400 | void cpufreq_acct_update_power(struct task_struct *p, cputime_t cputime) |
| 401 | { |
| 402 | unsigned long flags; |
| 403 | unsigned int state; |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 404 | unsigned int active_cpu_cnt = 0; |
| 405 | unsigned int policy_cpu_cnt = 0; |
| 406 | unsigned int policy_first_cpu; |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 407 | struct uid_entry *uid_entry; |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 408 | struct cpu_freqs *freqs = all_freqs[task_cpu(p)]; |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 409 | struct cpufreq_policy *policy; |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 410 | uid_t uid = from_kuid_munged(current_user_ns(), task_uid(p)); |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 411 | int cpu = 0; |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 412 | |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 413 | if (!freqs || is_idle_task(p) || p->flags & PF_EXITING) |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 414 | return; |
| 415 | |
| 416 | state = freqs->offset + READ_ONCE(freqs->last_index); |
| 417 | |
| 418 | spin_lock_irqsave(&task_time_in_state_lock, flags); |
| 419 | if ((state < p->max_state || !cpufreq_task_times_realloc_locked(p)) && |
| 420 | p->time_in_state) |
| 421 | p->time_in_state[state] += cputime; |
| 422 | spin_unlock_irqrestore(&task_time_in_state_lock, flags); |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 423 | |
| 424 | spin_lock_irqsave(&uid_lock, flags); |
| 425 | uid_entry = find_or_register_uid_locked(uid); |
| 426 | if (uid_entry && state < uid_entry->max_state) |
| 427 | uid_entry->time_in_state[state] += cputime; |
| 428 | spin_unlock_irqrestore(&uid_lock, flags); |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 429 | |
| 430 | rcu_read_lock(); |
| 431 | uid_entry = find_uid_entry_rcu(uid); |
| 432 | if (!uid_entry) { |
| 433 | rcu_read_unlock(); |
| 434 | return; |
| 435 | } |
| 436 | |
| 437 | for_each_possible_cpu(cpu) |
| 438 | if (!idle_cpu(cpu)) |
| 439 | ++active_cpu_cnt; |
| 440 | |
| 441 | atomic64_add(cputime, |
| 442 | &uid_entry->concurrent_times->active[active_cpu_cnt - 1]); |
| 443 | |
| 444 | policy = cpufreq_cpu_get(task_cpu(p)); |
| 445 | if (!policy) { |
| 446 | /* |
| 447 | * This CPU may have just come up and not have a cpufreq policy |
| 448 | * yet. |
| 449 | */ |
| 450 | rcu_read_unlock(); |
| 451 | return; |
| 452 | } |
| 453 | |
| 454 | for_each_cpu(cpu, policy->related_cpus) |
| 455 | if (!idle_cpu(cpu)) |
| 456 | ++policy_cpu_cnt; |
| 457 | |
| 458 | policy_first_cpu = cpumask_first(policy->related_cpus); |
| 459 | cpufreq_cpu_put(policy); |
| 460 | |
| 461 | atomic64_add(cputime, |
| 462 | &uid_entry->concurrent_times->policy[policy_first_cpu + |
| 463 | policy_cpu_cnt - 1]); |
| 464 | rcu_read_unlock(); |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 465 | } |
| 466 | |
Connor O'Brien | 3f33df2 | 2019-03-01 15:40:30 -0800 | [diff] [blame] | 467 | static int cpufreq_times_get_index(struct cpu_freqs *freqs, unsigned int freq) |
| 468 | { |
| 469 | int index; |
| 470 | for (index = 0; index < freqs->max_state; ++index) { |
| 471 | if (freqs->freq_table[index] == freq) |
| 472 | return index; |
| 473 | } |
| 474 | return -1; |
| 475 | } |
| 476 | |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 477 | void cpufreq_times_create_policy(struct cpufreq_policy *policy) |
| 478 | { |
Connor O'Brien | 3f33df2 | 2019-03-01 15:40:30 -0800 | [diff] [blame] | 479 | int cpu, index = 0; |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 480 | unsigned int count = 0; |
| 481 | struct cpufreq_frequency_table *pos, *table; |
| 482 | struct cpu_freqs *freqs; |
| 483 | void *tmp; |
| 484 | |
| 485 | if (all_freqs[policy->cpu]) |
| 486 | return; |
| 487 | |
| 488 | table = policy->freq_table; |
| 489 | if (!table) |
| 490 | return; |
| 491 | |
Connor O'Brien | 3f33df2 | 2019-03-01 15:40:30 -0800 | [diff] [blame] | 492 | cpufreq_for_each_valid_entry(pos, table) |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 493 | count++; |
| 494 | |
| 495 | tmp = kzalloc(sizeof(*freqs) + sizeof(freqs->freq_table[0]) * count, |
| 496 | GFP_KERNEL); |
| 497 | if (!tmp) |
| 498 | return; |
| 499 | |
| 500 | freqs = tmp; |
| 501 | freqs->max_state = count; |
| 502 | |
Connor O'Brien | 3f33df2 | 2019-03-01 15:40:30 -0800 | [diff] [blame] | 503 | cpufreq_for_each_valid_entry(pos, table) |
| 504 | freqs->freq_table[index++] = pos->frequency; |
| 505 | |
| 506 | index = cpufreq_times_get_index(freqs, policy->cur); |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 507 | if (index >= 0) |
| 508 | WRITE_ONCE(freqs->last_index, index); |
| 509 | |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 510 | freqs->offset = next_offset; |
| 511 | WRITE_ONCE(next_offset, freqs->offset + count); |
| 512 | for_each_cpu(cpu, policy->related_cpus) |
| 513 | all_freqs[cpu] = freqs; |
| 514 | } |
| 515 | |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 516 | static void uid_entry_reclaim(struct rcu_head *rcu) |
| 517 | { |
| 518 | struct uid_entry *uid_entry = container_of(rcu, struct uid_entry, rcu); |
| 519 | |
| 520 | kfree(uid_entry->concurrent_times); |
| 521 | kfree(uid_entry); |
| 522 | } |
| 523 | |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 524 | void cpufreq_task_times_remove_uids(uid_t uid_start, uid_t uid_end) |
| 525 | { |
| 526 | struct uid_entry *uid_entry; |
| 527 | struct hlist_node *tmp; |
| 528 | unsigned long flags; |
| 529 | |
| 530 | spin_lock_irqsave(&uid_lock, flags); |
| 531 | |
| 532 | for (; uid_start <= uid_end; uid_start++) { |
| 533 | hash_for_each_possible_safe(uid_hash_table, uid_entry, tmp, |
| 534 | hash, uid_start) { |
| 535 | if (uid_start == uid_entry->uid) { |
| 536 | hash_del_rcu(&uid_entry->hash); |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 537 | call_rcu(&uid_entry->rcu, uid_entry_reclaim); |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 538 | } |
| 539 | } |
| 540 | } |
| 541 | |
| 542 | spin_unlock_irqrestore(&uid_lock, flags); |
| 543 | } |
| 544 | |
Connor O'Brien | 2f0bc4b | 2019-02-08 12:30:41 -0800 | [diff] [blame] | 545 | void cpufreq_times_record_transition(struct cpufreq_policy *policy, |
| 546 | unsigned int new_freq) |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 547 | { |
| 548 | int index; |
Connor O'Brien | 2f0bc4b | 2019-02-08 12:30:41 -0800 | [diff] [blame] | 549 | struct cpu_freqs *freqs = all_freqs[policy->cpu]; |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 550 | if (!freqs) |
| 551 | return; |
| 552 | |
Connor O'Brien | 3f33df2 | 2019-03-01 15:40:30 -0800 | [diff] [blame] | 553 | index = cpufreq_times_get_index(freqs, new_freq); |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 554 | if (index >= 0) |
| 555 | WRITE_ONCE(freqs->last_index, index); |
Connor O'Brien | 6e7b83d | 2018-01-31 18:11:57 -0800 | [diff] [blame] | 556 | } |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 557 | |
| 558 | static const struct seq_operations uid_time_in_state_seq_ops = { |
| 559 | .start = uid_seq_start, |
| 560 | .next = uid_seq_next, |
| 561 | .stop = uid_seq_stop, |
| 562 | .show = uid_time_in_state_seq_show, |
| 563 | }; |
| 564 | |
| 565 | static int uid_time_in_state_open(struct inode *inode, struct file *file) |
| 566 | { |
| 567 | return seq_open(file, &uid_time_in_state_seq_ops); |
| 568 | } |
| 569 | |
Connor O'Brien | f17f4fb | 2018-01-22 18:28:08 -0800 | [diff] [blame] | 570 | int single_uid_time_in_state_open(struct inode *inode, struct file *file) |
| 571 | { |
| 572 | return single_open(file, single_uid_time_in_state_show, |
| 573 | &(inode->i_uid)); |
| 574 | } |
| 575 | |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 576 | static const struct file_operations uid_time_in_state_fops = { |
| 577 | .open = uid_time_in_state_open, |
| 578 | .read = seq_read, |
| 579 | .llseek = seq_lseek, |
| 580 | .release = seq_release, |
| 581 | }; |
| 582 | |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 583 | static const struct seq_operations concurrent_active_time_seq_ops = { |
| 584 | .start = uid_seq_start, |
| 585 | .next = uid_seq_next, |
| 586 | .stop = uid_seq_stop, |
| 587 | .show = concurrent_active_time_seq_show, |
| 588 | }; |
| 589 | |
| 590 | static int concurrent_active_time_open(struct inode *inode, struct file *file) |
| 591 | { |
| 592 | return seq_open(file, &concurrent_active_time_seq_ops); |
| 593 | } |
| 594 | |
| 595 | static const struct file_operations concurrent_active_time_fops = { |
| 596 | .open = concurrent_active_time_open, |
| 597 | .read = seq_read, |
| 598 | .llseek = seq_lseek, |
| 599 | .release = seq_release, |
| 600 | }; |
| 601 | |
| 602 | static const struct seq_operations concurrent_policy_time_seq_ops = { |
| 603 | .start = uid_seq_start, |
| 604 | .next = uid_seq_next, |
| 605 | .stop = uid_seq_stop, |
| 606 | .show = concurrent_policy_time_seq_show, |
| 607 | }; |
| 608 | |
| 609 | static int concurrent_policy_time_open(struct inode *inode, struct file *file) |
| 610 | { |
| 611 | return seq_open(file, &concurrent_policy_time_seq_ops); |
| 612 | } |
| 613 | |
| 614 | static const struct file_operations concurrent_policy_time_fops = { |
| 615 | .open = concurrent_policy_time_open, |
| 616 | .read = seq_read, |
| 617 | .llseek = seq_lseek, |
| 618 | .release = seq_release, |
| 619 | }; |
| 620 | |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 621 | static int __init cpufreq_times_init(void) |
| 622 | { |
| 623 | proc_create_data("uid_time_in_state", 0444, NULL, |
| 624 | &uid_time_in_state_fops, NULL); |
| 625 | |
Connor O'Brien | 605e2ec | 2018-10-05 19:20:54 -0700 | [diff] [blame] | 626 | proc_create_data("uid_concurrent_active_time", 0444, NULL, |
| 627 | &concurrent_active_time_fops, NULL); |
| 628 | |
| 629 | proc_create_data("uid_concurrent_policy_time", 0444, NULL, |
| 630 | &concurrent_policy_time_fops, NULL); |
| 631 | |
Connor O'Brien | fcb3db1 | 2018-02-06 13:30:27 -0800 | [diff] [blame] | 632 | return 0; |
| 633 | } |
| 634 | |
| 635 | early_initcall(cpufreq_times_init); |