1 // SPDX-License-Identifier: GPL-2.0 2 #include <dirent.h> 3 #include <errno.h> 4 #include <limits.h> 5 #include <stdbool.h> 6 #include <stdlib.h> 7 #include <stdio.h> 8 #include <sys/types.h> 9 #include <sys/stat.h> 10 #include <unistd.h> 11 #include "string2.h" 12 #include "strlist.h" 13 #include <string.h> 14 #include <api/fs/fs.h> 15 #include <linux/string.h> 16 #include <linux/zalloc.h> 17 #include "asm/bug.h" 18 #include "thread_map.h" 19 #include "debug.h" 20 #include "event.h" 21 #include <internal/threadmap.h> 22 23 /* Skip "." and ".." directories */ 24 static int filter(const struct dirent *dir) 25 { 26 if (dir->d_name[0] == '.') 27 return 0; 28 else 29 return 1; 30 } 31 32 #define thread_map__alloc(__nr) perf_thread_map__realloc(NULL, __nr) 33 34 struct perf_thread_map *thread_map__new_by_pid(pid_t pid) 35 { 36 struct perf_thread_map *threads; 37 char name[256]; 38 int items; 39 struct dirent **namelist = NULL; 40 int i; 41 42 sprintf(name, "/proc/%d/task", pid); 43 items = scandir(name, &namelist, filter, NULL); 44 if (items <= 0) 45 return NULL; 46 47 threads = thread_map__alloc(items); 48 if (threads != NULL) { 49 for (i = 0; i < items; i++) 50 perf_thread_map__set_pid(threads, i, atoi(namelist[i]->d_name)); 51 threads->nr = items; 52 refcount_set(&threads->refcnt, 1); 53 } 54 55 for (i=0; i<items; i++) 56 zfree(&namelist[i]); 57 free(namelist); 58 59 return threads; 60 } 61 62 struct perf_thread_map *thread_map__new_by_tid(pid_t tid) 63 { 64 struct perf_thread_map *threads = thread_map__alloc(1); 65 66 if (threads != NULL) { 67 perf_thread_map__set_pid(threads, 0, tid); 68 threads->nr = 1; 69 refcount_set(&threads->refcnt, 1); 70 } 71 72 return threads; 73 } 74 75 static struct perf_thread_map *__thread_map__new_all_cpus(uid_t uid) 76 { 77 DIR *proc; 78 int max_threads = 32, items, i; 79 char path[NAME_MAX + 1 + 6]; 80 struct dirent *dirent, **namelist = NULL; 81 struct perf_thread_map *threads = thread_map__alloc(max_threads); 82 83 if (threads == NULL) 84 goto out; 85 86 proc = opendir("/proc"); 87 if (proc == NULL) 88 goto out_free_threads; 89 90 threads->nr = 0; 91 refcount_set(&threads->refcnt, 1); 92 93 while ((dirent = readdir(proc)) != NULL) { 94 char *end; 95 bool grow = false; 96 pid_t pid = strtol(dirent->d_name, &end, 10); 97 98 if (*end) /* only interested in proper numerical dirents */ 99 continue; 100 101 snprintf(path, sizeof(path), "/proc/%s", dirent->d_name); 102 103 if (uid != UINT_MAX) { 104 struct stat st; 105 106 if (stat(path, &st) != 0 || st.st_uid != uid) 107 continue; 108 } 109 110 snprintf(path, sizeof(path), "/proc/%d/task", pid); 111 items = scandir(path, &namelist, filter, NULL); 112 if (items <= 0) 113 goto out_free_closedir; 114 115 while (threads->nr + items >= max_threads) { 116 max_threads *= 2; 117 grow = true; 118 } 119 120 if (grow) { 121 struct perf_thread_map *tmp; 122 123 tmp = perf_thread_map__realloc(threads, max_threads); 124 if (tmp == NULL) 125 goto out_free_namelist; 126 127 threads = tmp; 128 } 129 130 for (i = 0; i < items; i++) { 131 perf_thread_map__set_pid(threads, threads->nr + i, 132 atoi(namelist[i]->d_name)); 133 } 134 135 for (i = 0; i < items; i++) 136 zfree(&namelist[i]); 137 free(namelist); 138 139 threads->nr += items; 140 } 141 142 out_closedir: 143 closedir(proc); 144 out: 145 return threads; 146 147 out_free_threads: 148 free(threads); 149 return NULL; 150 151 out_free_namelist: 152 for (i = 0; i < items; i++) 153 zfree(&namelist[i]); 154 free(namelist); 155 156 out_free_closedir: 157 zfree(&threads); 158 goto out_closedir; 159 } 160 161 struct perf_thread_map *thread_map__new_all_cpus(void) 162 { 163 return __thread_map__new_all_cpus(UINT_MAX); 164 } 165 166 struct perf_thread_map *thread_map__new_by_uid(uid_t uid) 167 { 168 return __thread_map__new_all_cpus(uid); 169 } 170 171 struct perf_thread_map *thread_map__new(pid_t pid, pid_t tid, uid_t uid) 172 { 173 if (pid != -1) 174 return thread_map__new_by_pid(pid); 175 176 if (tid == -1 && uid != UINT_MAX) 177 return thread_map__new_by_uid(uid); 178 179 return thread_map__new_by_tid(tid); 180 } 181 182 static struct perf_thread_map *thread_map__new_by_pid_str(const char *pid_str) 183 { 184 struct perf_thread_map *threads = NULL, *nt; 185 char name[256]; 186 int items, total_tasks = 0; 187 struct dirent **namelist = NULL; 188 int i, j = 0; 189 pid_t pid, prev_pid = INT_MAX; 190 char *end_ptr; 191 struct str_node *pos; 192 struct strlist_config slist_config = { .dont_dupstr = true, }; 193 struct strlist *slist = strlist__new(pid_str, &slist_config); 194 195 if (!slist) 196 return NULL; 197 198 strlist__for_each_entry(pos, slist) { 199 pid = strtol(pos->s, &end_ptr, 10); 200 201 if (pid == INT_MIN || pid == INT_MAX || 202 (*end_ptr != '\0' && *end_ptr != ',')) 203 goto out_free_threads; 204 205 if (pid == prev_pid) 206 continue; 207 208 sprintf(name, "/proc/%d/task", pid); 209 items = scandir(name, &namelist, filter, NULL); 210 if (items <= 0) 211 goto out_free_threads; 212 213 total_tasks += items; 214 nt = perf_thread_map__realloc(threads, total_tasks); 215 if (nt == NULL) 216 goto out_free_namelist; 217 218 threads = nt; 219 220 for (i = 0; i < items; i++) { 221 perf_thread_map__set_pid(threads, j++, atoi(namelist[i]->d_name)); 222 zfree(&namelist[i]); 223 } 224 threads->nr = total_tasks; 225 free(namelist); 226 } 227 228 out: 229 strlist__delete(slist); 230 if (threads) 231 refcount_set(&threads->refcnt, 1); 232 return threads; 233 234 out_free_namelist: 235 for (i = 0; i < items; i++) 236 zfree(&namelist[i]); 237 free(namelist); 238 239 out_free_threads: 240 zfree(&threads); 241 goto out; 242 } 243 244 struct perf_thread_map *thread_map__new_by_tid_str(const char *tid_str) 245 { 246 struct perf_thread_map *threads = NULL, *nt; 247 int ntasks = 0; 248 pid_t tid, prev_tid = INT_MAX; 249 char *end_ptr; 250 struct str_node *pos; 251 struct strlist_config slist_config = { .dont_dupstr = true, }; 252 struct strlist *slist; 253 254 /* perf-stat expects threads to be generated even if tid not given */ 255 if (!tid_str) 256 return perf_thread_map__new_dummy(); 257 258 slist = strlist__new(tid_str, &slist_config); 259 if (!slist) 260 return NULL; 261 262 strlist__for_each_entry(pos, slist) { 263 tid = strtol(pos->s, &end_ptr, 10); 264 265 if (tid == INT_MIN || tid == INT_MAX || 266 (*end_ptr != '\0' && *end_ptr != ',')) 267 goto out_free_threads; 268 269 if (tid == prev_tid) 270 continue; 271 272 ntasks++; 273 nt = perf_thread_map__realloc(threads, ntasks); 274 275 if (nt == NULL) 276 goto out_free_threads; 277 278 threads = nt; 279 perf_thread_map__set_pid(threads, ntasks - 1, tid); 280 threads->nr = ntasks; 281 } 282 out: 283 strlist__delete(slist); 284 if (threads) 285 refcount_set(&threads->refcnt, 1); 286 return threads; 287 288 out_free_threads: 289 zfree(&threads); 290 goto out; 291 } 292 293 struct perf_thread_map *thread_map__new_str(const char *pid, const char *tid, 294 uid_t uid, bool all_threads) 295 { 296 if (pid) 297 return thread_map__new_by_pid_str(pid); 298 299 if (!tid && uid != UINT_MAX) 300 return thread_map__new_by_uid(uid); 301 302 if (all_threads) 303 return thread_map__new_all_cpus(); 304 305 return thread_map__new_by_tid_str(tid); 306 } 307 308 size_t thread_map__fprintf(struct perf_thread_map *threads, FILE *fp) 309 { 310 int i; 311 size_t printed = fprintf(fp, "%d thread%s: ", 312 threads->nr, threads->nr > 1 ? "s" : ""); 313 for (i = 0; i < threads->nr; ++i) 314 printed += fprintf(fp, "%s%d", i ? ", " : "", perf_thread_map__pid(threads, i)); 315 316 return printed + fprintf(fp, "\n"); 317 } 318 319 static int get_comm(char **comm, pid_t pid) 320 { 321 char *path; 322 size_t size; 323 int err; 324 325 if (asprintf(&path, "%s/%d/comm", procfs__mountpoint(), pid) == -1) 326 return -ENOMEM; 327 328 err = filename__read_str(path, comm, &size); 329 if (!err) { 330 /* 331 * We're reading 16 bytes, while filename__read_str 332 * allocates data per BUFSIZ bytes, so we can safely 333 * mark the end of the string. 334 */ 335 (*comm)[size] = 0; 336 strim(*comm); 337 } 338 339 free(path); 340 return err; 341 } 342 343 static void comm_init(struct perf_thread_map *map, int i) 344 { 345 pid_t pid = perf_thread_map__pid(map, i); 346 char *comm = NULL; 347 348 /* dummy pid comm initialization */ 349 if (pid == -1) { 350 map->map[i].comm = strdup("dummy"); 351 return; 352 } 353 354 /* 355 * The comm name is like extra bonus ;-), 356 * so just warn if we fail for any reason. 357 */ 358 if (get_comm(&comm, pid)) 359 pr_warning("Couldn't resolve comm name for pid %d\n", pid); 360 361 map->map[i].comm = comm; 362 } 363 364 void thread_map__read_comms(struct perf_thread_map *threads) 365 { 366 int i; 367 368 for (i = 0; i < threads->nr; ++i) 369 comm_init(threads, i); 370 } 371 372 static void thread_map__copy_event(struct perf_thread_map *threads, 373 struct perf_record_thread_map *event) 374 { 375 unsigned i; 376 377 threads->nr = (int) event->nr; 378 379 for (i = 0; i < event->nr; i++) { 380 perf_thread_map__set_pid(threads, i, (pid_t) event->entries[i].pid); 381 threads->map[i].comm = strndup(event->entries[i].comm, 16); 382 } 383 384 refcount_set(&threads->refcnt, 1); 385 } 386 387 struct perf_thread_map *thread_map__new_event(struct perf_record_thread_map *event) 388 { 389 struct perf_thread_map *threads; 390 391 threads = thread_map__alloc(event->nr); 392 if (threads) 393 thread_map__copy_event(threads, event); 394 395 return threads; 396 } 397 398 bool thread_map__has(struct perf_thread_map *threads, pid_t pid) 399 { 400 int i; 401 402 for (i = 0; i < threads->nr; ++i) { 403 if (threads->map[i].pid == pid) 404 return true; 405 } 406 407 return false; 408 } 409 410 int thread_map__remove(struct perf_thread_map *threads, int idx) 411 { 412 int i; 413 414 if (threads->nr < 1) 415 return -EINVAL; 416 417 if (idx >= threads->nr) 418 return -EINVAL; 419 420 /* 421 * Free the 'idx' item and shift the rest up. 422 */ 423 zfree(&threads->map[idx].comm); 424 425 for (i = idx; i < threads->nr - 1; i++) 426 threads->map[i] = threads->map[i + 1]; 427 428 threads->nr--; 429 return 0; 430 } 431