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 pr_debug("scandir for %d returned empty, skipping\n", pid); 114 continue; 115 } 116 while (threads->nr + items >= max_threads) { 117 max_threads *= 2; 118 grow = true; 119 } 120 121 if (grow) { 122 struct perf_thread_map *tmp; 123 124 tmp = perf_thread_map__realloc(threads, max_threads); 125 if (tmp == NULL) 126 goto out_free_namelist; 127 128 threads = tmp; 129 } 130 131 for (i = 0; i < items; i++) { 132 perf_thread_map__set_pid(threads, threads->nr + i, 133 atoi(namelist[i]->d_name)); 134 } 135 136 for (i = 0; i < items; i++) 137 zfree(&namelist[i]); 138 free(namelist); 139 140 threads->nr += items; 141 } 142 143 out_closedir: 144 closedir(proc); 145 out: 146 return threads; 147 148 out_free_threads: 149 free(threads); 150 return NULL; 151 152 out_free_namelist: 153 for (i = 0; i < items; i++) 154 zfree(&namelist[i]); 155 free(namelist); 156 zfree(&threads); 157 goto out_closedir; 158 } 159 160 struct perf_thread_map *thread_map__new_all_cpus(void) 161 { 162 return __thread_map__new_all_cpus(UINT_MAX); 163 } 164 165 struct perf_thread_map *thread_map__new_by_uid(uid_t uid) 166 { 167 return __thread_map__new_all_cpus(uid); 168 } 169 170 struct perf_thread_map *thread_map__new(pid_t pid, pid_t tid, uid_t uid) 171 { 172 if (pid != -1) 173 return thread_map__new_by_pid(pid); 174 175 if (tid == -1 && uid != UINT_MAX) 176 return thread_map__new_by_uid(uid); 177 178 return thread_map__new_by_tid(tid); 179 } 180 181 static struct perf_thread_map *thread_map__new_by_pid_str(const char *pid_str) 182 { 183 struct perf_thread_map *threads = NULL, *nt; 184 char name[256]; 185 int items, total_tasks = 0; 186 struct dirent **namelist = NULL; 187 int i, j = 0; 188 pid_t pid, prev_pid = INT_MAX; 189 char *end_ptr; 190 struct str_node *pos; 191 struct strlist_config slist_config = { .dont_dupstr = true, }; 192 struct strlist *slist = strlist__new(pid_str, &slist_config); 193 194 if (!slist) 195 return NULL; 196 197 strlist__for_each_entry(pos, slist) { 198 pid = strtol(pos->s, &end_ptr, 10); 199 200 if (pid == INT_MIN || pid == INT_MAX || 201 (*end_ptr != '\0' && *end_ptr != ',')) 202 goto out_free_threads; 203 204 if (pid == prev_pid) 205 continue; 206 207 sprintf(name, "/proc/%d/task", pid); 208 items = scandir(name, &namelist, filter, NULL); 209 if (items <= 0) 210 goto out_free_threads; 211 212 total_tasks += items; 213 nt = perf_thread_map__realloc(threads, total_tasks); 214 if (nt == NULL) 215 goto out_free_namelist; 216 217 threads = nt; 218 219 for (i = 0; i < items; i++) { 220 perf_thread_map__set_pid(threads, j++, atoi(namelist[i]->d_name)); 221 zfree(&namelist[i]); 222 } 223 threads->nr = total_tasks; 224 free(namelist); 225 } 226 227 out: 228 strlist__delete(slist); 229 if (threads) 230 refcount_set(&threads->refcnt, 1); 231 return threads; 232 233 out_free_namelist: 234 for (i = 0; i < items; i++) 235 zfree(&namelist[i]); 236 free(namelist); 237 238 out_free_threads: 239 zfree(&threads); 240 goto out; 241 } 242 243 struct perf_thread_map *thread_map__new_by_tid_str(const char *tid_str) 244 { 245 struct perf_thread_map *threads = NULL, *nt; 246 int ntasks = 0; 247 pid_t tid, prev_tid = INT_MAX; 248 char *end_ptr; 249 struct str_node *pos; 250 struct strlist_config slist_config = { .dont_dupstr = true, }; 251 struct strlist *slist; 252 253 /* perf-stat expects threads to be generated even if tid not given */ 254 if (!tid_str) 255 return perf_thread_map__new_dummy(); 256 257 slist = strlist__new(tid_str, &slist_config); 258 if (!slist) 259 return NULL; 260 261 strlist__for_each_entry(pos, slist) { 262 tid = strtol(pos->s, &end_ptr, 10); 263 264 if (tid == INT_MIN || tid == INT_MAX || 265 (*end_ptr != '\0' && *end_ptr != ',')) 266 goto out_free_threads; 267 268 if (tid == prev_tid) 269 continue; 270 271 ntasks++; 272 nt = perf_thread_map__realloc(threads, ntasks); 273 274 if (nt == NULL) 275 goto out_free_threads; 276 277 threads = nt; 278 perf_thread_map__set_pid(threads, ntasks - 1, tid); 279 threads->nr = ntasks; 280 } 281 out: 282 strlist__delete(slist); 283 if (threads) 284 refcount_set(&threads->refcnt, 1); 285 return threads; 286 287 out_free_threads: 288 zfree(&threads); 289 goto out; 290 } 291 292 struct perf_thread_map *thread_map__new_str(const char *pid, const char *tid, 293 uid_t uid, bool all_threads) 294 { 295 if (pid) 296 return thread_map__new_by_pid_str(pid); 297 298 if (!tid && uid != UINT_MAX) 299 return thread_map__new_by_uid(uid); 300 301 if (all_threads) 302 return thread_map__new_all_cpus(); 303 304 return thread_map__new_by_tid_str(tid); 305 } 306 307 size_t thread_map__fprintf(struct perf_thread_map *threads, FILE *fp) 308 { 309 int i; 310 size_t printed = fprintf(fp, "%d thread%s: ", 311 threads->nr, threads->nr > 1 ? "s" : ""); 312 for (i = 0; i < threads->nr; ++i) 313 printed += fprintf(fp, "%s%d", i ? ", " : "", perf_thread_map__pid(threads, i)); 314 315 return printed + fprintf(fp, "\n"); 316 } 317 318 static int get_comm(char **comm, pid_t pid) 319 { 320 char *path; 321 size_t size; 322 int err; 323 324 if (asprintf(&path, "%s/%d/comm", procfs__mountpoint(), pid) == -1) 325 return -ENOMEM; 326 327 err = filename__read_str(path, comm, &size); 328 if (!err) { 329 /* 330 * We're reading 16 bytes, while filename__read_str 331 * allocates data per BUFSIZ bytes, so we can safely 332 * mark the end of the string. 333 */ 334 (*comm)[size] = 0; 335 strim(*comm); 336 } 337 338 free(path); 339 return err; 340 } 341 342 static void comm_init(struct perf_thread_map *map, int i) 343 { 344 pid_t pid = perf_thread_map__pid(map, i); 345 char *comm = NULL; 346 347 /* dummy pid comm initialization */ 348 if (pid == -1) { 349 map->map[i].comm = strdup("dummy"); 350 return; 351 } 352 353 /* 354 * The comm name is like extra bonus ;-), 355 * so just warn if we fail for any reason. 356 */ 357 if (get_comm(&comm, pid)) 358 pr_warning("Couldn't resolve comm name for pid %d\n", pid); 359 360 map->map[i].comm = comm; 361 } 362 363 void thread_map__read_comms(struct perf_thread_map *threads) 364 { 365 int i; 366 367 for (i = 0; i < threads->nr; ++i) 368 comm_init(threads, i); 369 } 370 371 static void thread_map__copy_event(struct perf_thread_map *threads, 372 struct perf_record_thread_map *event) 373 { 374 unsigned i; 375 376 threads->nr = (int) event->nr; 377 378 for (i = 0; i < event->nr; i++) { 379 perf_thread_map__set_pid(threads, i, (pid_t) event->entries[i].pid); 380 threads->map[i].comm = strndup(event->entries[i].comm, 16); 381 } 382 383 refcount_set(&threads->refcnt, 1); 384 } 385 386 struct perf_thread_map *thread_map__new_event(struct perf_record_thread_map *event) 387 { 388 struct perf_thread_map *threads; 389 390 threads = thread_map__alloc(event->nr); 391 if (threads) 392 thread_map__copy_event(threads, event); 393 394 return threads; 395 } 396 397 bool thread_map__has(struct perf_thread_map *threads, pid_t pid) 398 { 399 int i; 400 401 for (i = 0; i < threads->nr; ++i) { 402 if (threads->map[i].pid == pid) 403 return true; 404 } 405 406 return false; 407 } 408 409 int thread_map__remove(struct perf_thread_map *threads, int idx) 410 { 411 int i; 412 413 if (threads->nr < 1) 414 return -EINVAL; 415 416 if (idx >= threads->nr) 417 return -EINVAL; 418 419 /* 420 * Free the 'idx' item and shift the rest up. 421 */ 422 zfree(&threads->map[idx].comm); 423 424 for (i = idx; i < threads->nr - 1; i++) 425 threads->map[i] = threads->map[i + 1]; 426 427 threads->nr--; 428 return 0; 429 } 430