| 1 | /* |
| 2 | * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com> |
| 3 | * |
| 4 | * Parts came from builtin-{top,stat,record}.c, see those files for further |
| 5 | * copyright notes. |
| 6 | * |
| 7 | * Released under the GPL v2. (and only v2, not any later version) |
| 8 | */ |
| 9 | #include "util.h" |
| 10 | #include <api/fs/fs.h> |
| 11 | #include <poll.h> |
| 12 | #include "cpumap.h" |
| 13 | #include "thread_map.h" |
| 14 | #include "target.h" |
| 15 | #include "evlist.h" |
| 16 | #include "evsel.h" |
| 17 | #include "debug.h" |
| 18 | #include <unistd.h> |
| 19 | |
| 20 | #include "parse-events.h" |
| 21 | #include <subcmd/parse-options.h> |
| 22 | |
| 23 | #include <sys/mman.h> |
| 24 | |
| 25 | #include <linux/bitops.h> |
| 26 | #include <linux/hash.h> |
| 27 | #include <linux/log2.h> |
| 28 | #include <linux/err.h> |
| 29 | |
| 30 | static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx); |
| 31 | static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx); |
| 32 | |
| 33 | #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y)) |
| 34 | #define SID(e, x, y) xyarray__entry(e->sample_id, x, y) |
| 35 | |
| 36 | void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus, |
| 37 | struct thread_map *threads) |
| 38 | { |
| 39 | int i; |
| 40 | |
| 41 | for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i) |
| 42 | INIT_HLIST_HEAD(&evlist->heads[i]); |
| 43 | INIT_LIST_HEAD(&evlist->entries); |
| 44 | perf_evlist__set_maps(evlist, cpus, threads); |
| 45 | fdarray__init(&evlist->pollfd, 64); |
| 46 | evlist->workload.pid = -1; |
| 47 | } |
| 48 | |
| 49 | struct perf_evlist *perf_evlist__new(void) |
| 50 | { |
| 51 | struct perf_evlist *evlist = zalloc(sizeof(*evlist)); |
| 52 | |
| 53 | if (evlist != NULL) |
| 54 | perf_evlist__init(evlist, NULL, NULL); |
| 55 | |
| 56 | return evlist; |
| 57 | } |
| 58 | |
| 59 | struct perf_evlist *perf_evlist__new_default(void) |
| 60 | { |
| 61 | struct perf_evlist *evlist = perf_evlist__new(); |
| 62 | |
| 63 | if (evlist && perf_evlist__add_default(evlist)) { |
| 64 | perf_evlist__delete(evlist); |
| 65 | evlist = NULL; |
| 66 | } |
| 67 | |
| 68 | return evlist; |
| 69 | } |
| 70 | |
| 71 | struct perf_evlist *perf_evlist__new_dummy(void) |
| 72 | { |
| 73 | struct perf_evlist *evlist = perf_evlist__new(); |
| 74 | |
| 75 | if (evlist && perf_evlist__add_dummy(evlist)) { |
| 76 | perf_evlist__delete(evlist); |
| 77 | evlist = NULL; |
| 78 | } |
| 79 | |
| 80 | return evlist; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * perf_evlist__set_id_pos - set the positions of event ids. |
| 85 | * @evlist: selected event list |
| 86 | * |
| 87 | * Events with compatible sample types all have the same id_pos |
| 88 | * and is_pos. For convenience, put a copy on evlist. |
| 89 | */ |
| 90 | void perf_evlist__set_id_pos(struct perf_evlist *evlist) |
| 91 | { |
| 92 | struct perf_evsel *first = perf_evlist__first(evlist); |
| 93 | |
| 94 | evlist->id_pos = first->id_pos; |
| 95 | evlist->is_pos = first->is_pos; |
| 96 | } |
| 97 | |
| 98 | static void perf_evlist__update_id_pos(struct perf_evlist *evlist) |
| 99 | { |
| 100 | struct perf_evsel *evsel; |
| 101 | |
| 102 | evlist__for_each(evlist, evsel) |
| 103 | perf_evsel__calc_id_pos(evsel); |
| 104 | |
| 105 | perf_evlist__set_id_pos(evlist); |
| 106 | } |
| 107 | |
| 108 | static void perf_evlist__purge(struct perf_evlist *evlist) |
| 109 | { |
| 110 | struct perf_evsel *pos, *n; |
| 111 | |
| 112 | evlist__for_each_safe(evlist, n, pos) { |
| 113 | list_del_init(&pos->node); |
| 114 | pos->evlist = NULL; |
| 115 | perf_evsel__delete(pos); |
| 116 | } |
| 117 | |
| 118 | evlist->nr_entries = 0; |
| 119 | } |
| 120 | |
| 121 | void perf_evlist__exit(struct perf_evlist *evlist) |
| 122 | { |
| 123 | zfree(&evlist->mmap); |
| 124 | fdarray__exit(&evlist->pollfd); |
| 125 | } |
| 126 | |
| 127 | void perf_evlist__delete(struct perf_evlist *evlist) |
| 128 | { |
| 129 | perf_evlist__munmap(evlist); |
| 130 | perf_evlist__close(evlist); |
| 131 | cpu_map__put(evlist->cpus); |
| 132 | thread_map__put(evlist->threads); |
| 133 | evlist->cpus = NULL; |
| 134 | evlist->threads = NULL; |
| 135 | perf_evlist__purge(evlist); |
| 136 | perf_evlist__exit(evlist); |
| 137 | free(evlist); |
| 138 | } |
| 139 | |
| 140 | static void __perf_evlist__propagate_maps(struct perf_evlist *evlist, |
| 141 | struct perf_evsel *evsel) |
| 142 | { |
| 143 | /* |
| 144 | * We already have cpus for evsel (via PMU sysfs) so |
| 145 | * keep it, if there's no target cpu list defined. |
| 146 | */ |
| 147 | if (!evsel->own_cpus || evlist->has_user_cpus) { |
| 148 | cpu_map__put(evsel->cpus); |
| 149 | evsel->cpus = cpu_map__get(evlist->cpus); |
| 150 | } else if (evsel->cpus != evsel->own_cpus) { |
| 151 | cpu_map__put(evsel->cpus); |
| 152 | evsel->cpus = cpu_map__get(evsel->own_cpus); |
| 153 | } |
| 154 | |
| 155 | thread_map__put(evsel->threads); |
| 156 | evsel->threads = thread_map__get(evlist->threads); |
| 157 | } |
| 158 | |
| 159 | static void perf_evlist__propagate_maps(struct perf_evlist *evlist) |
| 160 | { |
| 161 | struct perf_evsel *evsel; |
| 162 | |
| 163 | evlist__for_each(evlist, evsel) |
| 164 | __perf_evlist__propagate_maps(evlist, evsel); |
| 165 | } |
| 166 | |
| 167 | void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry) |
| 168 | { |
| 169 | entry->evlist = evlist; |
| 170 | list_add_tail(&entry->node, &evlist->entries); |
| 171 | entry->idx = evlist->nr_entries; |
| 172 | entry->tracking = !entry->idx; |
| 173 | |
| 174 | if (!evlist->nr_entries++) |
| 175 | perf_evlist__set_id_pos(evlist); |
| 176 | |
| 177 | __perf_evlist__propagate_maps(evlist, entry); |
| 178 | } |
| 179 | |
| 180 | void perf_evlist__remove(struct perf_evlist *evlist, struct perf_evsel *evsel) |
| 181 | { |
| 182 | evsel->evlist = NULL; |
| 183 | list_del_init(&evsel->node); |
| 184 | evlist->nr_entries -= 1; |
| 185 | } |
| 186 | |
| 187 | void perf_evlist__splice_list_tail(struct perf_evlist *evlist, |
| 188 | struct list_head *list) |
| 189 | { |
| 190 | struct perf_evsel *evsel, *temp; |
| 191 | |
| 192 | __evlist__for_each_safe(list, temp, evsel) { |
| 193 | list_del_init(&evsel->node); |
| 194 | perf_evlist__add(evlist, evsel); |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | void __perf_evlist__set_leader(struct list_head *list) |
| 199 | { |
| 200 | struct perf_evsel *evsel, *leader; |
| 201 | |
| 202 | leader = list_entry(list->next, struct perf_evsel, node); |
| 203 | evsel = list_entry(list->prev, struct perf_evsel, node); |
| 204 | |
| 205 | leader->nr_members = evsel->idx - leader->idx + 1; |
| 206 | |
| 207 | __evlist__for_each(list, evsel) { |
| 208 | evsel->leader = leader; |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | void perf_evlist__set_leader(struct perf_evlist *evlist) |
| 213 | { |
| 214 | if (evlist->nr_entries) { |
| 215 | evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0; |
| 216 | __perf_evlist__set_leader(&evlist->entries); |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | void perf_event_attr__set_max_precise_ip(struct perf_event_attr *attr) |
| 221 | { |
| 222 | attr->precise_ip = 3; |
| 223 | |
| 224 | while (attr->precise_ip != 0) { |
| 225 | int fd = sys_perf_event_open(attr, 0, -1, -1, 0); |
| 226 | if (fd != -1) { |
| 227 | close(fd); |
| 228 | break; |
| 229 | } |
| 230 | --attr->precise_ip; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | int perf_evlist__add_default(struct perf_evlist *evlist) |
| 235 | { |
| 236 | struct perf_event_attr attr = { |
| 237 | .type = PERF_TYPE_HARDWARE, |
| 238 | .config = PERF_COUNT_HW_CPU_CYCLES, |
| 239 | }; |
| 240 | struct perf_evsel *evsel; |
| 241 | |
| 242 | event_attr_init(&attr); |
| 243 | |
| 244 | perf_event_attr__set_max_precise_ip(&attr); |
| 245 | |
| 246 | evsel = perf_evsel__new(&attr); |
| 247 | if (evsel == NULL) |
| 248 | goto error; |
| 249 | |
| 250 | /* use asprintf() because free(evsel) assumes name is allocated */ |
| 251 | if (asprintf(&evsel->name, "cycles%.*s", |
| 252 | attr.precise_ip ? attr.precise_ip + 1 : 0, ":ppp") < 0) |
| 253 | goto error_free; |
| 254 | |
| 255 | perf_evlist__add(evlist, evsel); |
| 256 | return 0; |
| 257 | error_free: |
| 258 | perf_evsel__delete(evsel); |
| 259 | error: |
| 260 | return -ENOMEM; |
| 261 | } |
| 262 | |
| 263 | int perf_evlist__add_dummy(struct perf_evlist *evlist) |
| 264 | { |
| 265 | struct perf_event_attr attr = { |
| 266 | .type = PERF_TYPE_SOFTWARE, |
| 267 | .config = PERF_COUNT_SW_DUMMY, |
| 268 | .size = sizeof(attr), /* to capture ABI version */ |
| 269 | }; |
| 270 | struct perf_evsel *evsel = perf_evsel__new(&attr); |
| 271 | |
| 272 | if (evsel == NULL) |
| 273 | return -ENOMEM; |
| 274 | |
| 275 | perf_evlist__add(evlist, evsel); |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | static int perf_evlist__add_attrs(struct perf_evlist *evlist, |
| 280 | struct perf_event_attr *attrs, size_t nr_attrs) |
| 281 | { |
| 282 | struct perf_evsel *evsel, *n; |
| 283 | LIST_HEAD(head); |
| 284 | size_t i; |
| 285 | |
| 286 | for (i = 0; i < nr_attrs; i++) { |
| 287 | evsel = perf_evsel__new_idx(attrs + i, evlist->nr_entries + i); |
| 288 | if (evsel == NULL) |
| 289 | goto out_delete_partial_list; |
| 290 | list_add_tail(&evsel->node, &head); |
| 291 | } |
| 292 | |
| 293 | perf_evlist__splice_list_tail(evlist, &head); |
| 294 | |
| 295 | return 0; |
| 296 | |
| 297 | out_delete_partial_list: |
| 298 | __evlist__for_each_safe(&head, n, evsel) |
| 299 | perf_evsel__delete(evsel); |
| 300 | return -1; |
| 301 | } |
| 302 | |
| 303 | int __perf_evlist__add_default_attrs(struct perf_evlist *evlist, |
| 304 | struct perf_event_attr *attrs, size_t nr_attrs) |
| 305 | { |
| 306 | size_t i; |
| 307 | |
| 308 | for (i = 0; i < nr_attrs; i++) |
| 309 | event_attr_init(attrs + i); |
| 310 | |
| 311 | return perf_evlist__add_attrs(evlist, attrs, nr_attrs); |
| 312 | } |
| 313 | |
| 314 | struct perf_evsel * |
| 315 | perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id) |
| 316 | { |
| 317 | struct perf_evsel *evsel; |
| 318 | |
| 319 | evlist__for_each(evlist, evsel) { |
| 320 | if (evsel->attr.type == PERF_TYPE_TRACEPOINT && |
| 321 | (int)evsel->attr.config == id) |
| 322 | return evsel; |
| 323 | } |
| 324 | |
| 325 | return NULL; |
| 326 | } |
| 327 | |
| 328 | struct perf_evsel * |
| 329 | perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist, |
| 330 | const char *name) |
| 331 | { |
| 332 | struct perf_evsel *evsel; |
| 333 | |
| 334 | evlist__for_each(evlist, evsel) { |
| 335 | if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) && |
| 336 | (strcmp(evsel->name, name) == 0)) |
| 337 | return evsel; |
| 338 | } |
| 339 | |
| 340 | return NULL; |
| 341 | } |
| 342 | |
| 343 | int perf_evlist__add_newtp(struct perf_evlist *evlist, |
| 344 | const char *sys, const char *name, void *handler) |
| 345 | { |
| 346 | struct perf_evsel *evsel = perf_evsel__newtp(sys, name); |
| 347 | |
| 348 | if (IS_ERR(evsel)) |
| 349 | return -1; |
| 350 | |
| 351 | evsel->handler = handler; |
| 352 | perf_evlist__add(evlist, evsel); |
| 353 | return 0; |
| 354 | } |
| 355 | |
| 356 | static int perf_evlist__nr_threads(struct perf_evlist *evlist, |
| 357 | struct perf_evsel *evsel) |
| 358 | { |
| 359 | if (evsel->system_wide) |
| 360 | return 1; |
| 361 | else |
| 362 | return thread_map__nr(evlist->threads); |
| 363 | } |
| 364 | |
| 365 | void perf_evlist__disable(struct perf_evlist *evlist) |
| 366 | { |
| 367 | struct perf_evsel *pos; |
| 368 | |
| 369 | evlist__for_each(evlist, pos) { |
| 370 | if (!perf_evsel__is_group_leader(pos) || !pos->fd) |
| 371 | continue; |
| 372 | perf_evsel__disable(pos); |
| 373 | } |
| 374 | |
| 375 | evlist->enabled = false; |
| 376 | } |
| 377 | |
| 378 | void perf_evlist__enable(struct perf_evlist *evlist) |
| 379 | { |
| 380 | struct perf_evsel *pos; |
| 381 | |
| 382 | evlist__for_each(evlist, pos) { |
| 383 | if (!perf_evsel__is_group_leader(pos) || !pos->fd) |
| 384 | continue; |
| 385 | perf_evsel__enable(pos); |
| 386 | } |
| 387 | |
| 388 | evlist->enabled = true; |
| 389 | } |
| 390 | |
| 391 | void perf_evlist__toggle_enable(struct perf_evlist *evlist) |
| 392 | { |
| 393 | (evlist->enabled ? perf_evlist__disable : perf_evlist__enable)(evlist); |
| 394 | } |
| 395 | |
| 396 | static int perf_evlist__enable_event_cpu(struct perf_evlist *evlist, |
| 397 | struct perf_evsel *evsel, int cpu) |
| 398 | { |
| 399 | int thread, err; |
| 400 | int nr_threads = perf_evlist__nr_threads(evlist, evsel); |
| 401 | |
| 402 | if (!evsel->fd) |
| 403 | return -EINVAL; |
| 404 | |
| 405 | for (thread = 0; thread < nr_threads; thread++) { |
| 406 | err = ioctl(FD(evsel, cpu, thread), |
| 407 | PERF_EVENT_IOC_ENABLE, 0); |
| 408 | if (err) |
| 409 | return err; |
| 410 | } |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | static int perf_evlist__enable_event_thread(struct perf_evlist *evlist, |
| 415 | struct perf_evsel *evsel, |
| 416 | int thread) |
| 417 | { |
| 418 | int cpu, err; |
| 419 | int nr_cpus = cpu_map__nr(evlist->cpus); |
| 420 | |
| 421 | if (!evsel->fd) |
| 422 | return -EINVAL; |
| 423 | |
| 424 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
| 425 | err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0); |
| 426 | if (err) |
| 427 | return err; |
| 428 | } |
| 429 | return 0; |
| 430 | } |
| 431 | |
| 432 | int perf_evlist__enable_event_idx(struct perf_evlist *evlist, |
| 433 | struct perf_evsel *evsel, int idx) |
| 434 | { |
| 435 | bool per_cpu_mmaps = !cpu_map__empty(evlist->cpus); |
| 436 | |
| 437 | if (per_cpu_mmaps) |
| 438 | return perf_evlist__enable_event_cpu(evlist, evsel, idx); |
| 439 | else |
| 440 | return perf_evlist__enable_event_thread(evlist, evsel, idx); |
| 441 | } |
| 442 | |
| 443 | int perf_evlist__alloc_pollfd(struct perf_evlist *evlist) |
| 444 | { |
| 445 | int nr_cpus = cpu_map__nr(evlist->cpus); |
| 446 | int nr_threads = thread_map__nr(evlist->threads); |
| 447 | int nfds = 0; |
| 448 | struct perf_evsel *evsel; |
| 449 | |
| 450 | evlist__for_each(evlist, evsel) { |
| 451 | if (evsel->system_wide) |
| 452 | nfds += nr_cpus; |
| 453 | else |
| 454 | nfds += nr_cpus * nr_threads; |
| 455 | } |
| 456 | |
| 457 | if (fdarray__available_entries(&evlist->pollfd) < nfds && |
| 458 | fdarray__grow(&evlist->pollfd, nfds) < 0) |
| 459 | return -ENOMEM; |
| 460 | |
| 461 | return 0; |
| 462 | } |
| 463 | |
| 464 | static int __perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd, int idx) |
| 465 | { |
| 466 | int pos = fdarray__add(&evlist->pollfd, fd, POLLIN | POLLERR | POLLHUP); |
| 467 | /* |
| 468 | * Save the idx so that when we filter out fds POLLHUP'ed we can |
| 469 | * close the associated evlist->mmap[] entry. |
| 470 | */ |
| 471 | if (pos >= 0) { |
| 472 | evlist->pollfd.priv[pos].idx = idx; |
| 473 | |
| 474 | fcntl(fd, F_SETFL, O_NONBLOCK); |
| 475 | } |
| 476 | |
| 477 | return pos; |
| 478 | } |
| 479 | |
| 480 | int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd) |
| 481 | { |
| 482 | return __perf_evlist__add_pollfd(evlist, fd, -1); |
| 483 | } |
| 484 | |
| 485 | static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd) |
| 486 | { |
| 487 | struct perf_evlist *evlist = container_of(fda, struct perf_evlist, pollfd); |
| 488 | |
| 489 | perf_evlist__mmap_put(evlist, fda->priv[fd].idx); |
| 490 | } |
| 491 | |
| 492 | int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask) |
| 493 | { |
| 494 | return fdarray__filter(&evlist->pollfd, revents_and_mask, |
| 495 | perf_evlist__munmap_filtered); |
| 496 | } |
| 497 | |
| 498 | int perf_evlist__poll(struct perf_evlist *evlist, int timeout) |
| 499 | { |
| 500 | return fdarray__poll(&evlist->pollfd, timeout); |
| 501 | } |
| 502 | |
| 503 | static void perf_evlist__id_hash(struct perf_evlist *evlist, |
| 504 | struct perf_evsel *evsel, |
| 505 | int cpu, int thread, u64 id) |
| 506 | { |
| 507 | int hash; |
| 508 | struct perf_sample_id *sid = SID(evsel, cpu, thread); |
| 509 | |
| 510 | sid->id = id; |
| 511 | sid->evsel = evsel; |
| 512 | hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS); |
| 513 | hlist_add_head(&sid->node, &evlist->heads[hash]); |
| 514 | } |
| 515 | |
| 516 | void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel, |
| 517 | int cpu, int thread, u64 id) |
| 518 | { |
| 519 | perf_evlist__id_hash(evlist, evsel, cpu, thread, id); |
| 520 | evsel->id[evsel->ids++] = id; |
| 521 | } |
| 522 | |
| 523 | int perf_evlist__id_add_fd(struct perf_evlist *evlist, |
| 524 | struct perf_evsel *evsel, |
| 525 | int cpu, int thread, int fd) |
| 526 | { |
| 527 | u64 read_data[4] = { 0, }; |
| 528 | int id_idx = 1; /* The first entry is the counter value */ |
| 529 | u64 id; |
| 530 | int ret; |
| 531 | |
| 532 | ret = ioctl(fd, PERF_EVENT_IOC_ID, &id); |
| 533 | if (!ret) |
| 534 | goto add; |
| 535 | |
| 536 | if (errno != ENOTTY) |
| 537 | return -1; |
| 538 | |
| 539 | /* Legacy way to get event id.. All hail to old kernels! */ |
| 540 | |
| 541 | /* |
| 542 | * This way does not work with group format read, so bail |
| 543 | * out in that case. |
| 544 | */ |
| 545 | if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP) |
| 546 | return -1; |
| 547 | |
| 548 | if (!(evsel->attr.read_format & PERF_FORMAT_ID) || |
| 549 | read(fd, &read_data, sizeof(read_data)) == -1) |
| 550 | return -1; |
| 551 | |
| 552 | if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) |
| 553 | ++id_idx; |
| 554 | if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) |
| 555 | ++id_idx; |
| 556 | |
| 557 | id = read_data[id_idx]; |
| 558 | |
| 559 | add: |
| 560 | perf_evlist__id_add(evlist, evsel, cpu, thread, id); |
| 561 | return 0; |
| 562 | } |
| 563 | |
| 564 | static void perf_evlist__set_sid_idx(struct perf_evlist *evlist, |
| 565 | struct perf_evsel *evsel, int idx, int cpu, |
| 566 | int thread) |
| 567 | { |
| 568 | struct perf_sample_id *sid = SID(evsel, cpu, thread); |
| 569 | sid->idx = idx; |
| 570 | if (evlist->cpus && cpu >= 0) |
| 571 | sid->cpu = evlist->cpus->map[cpu]; |
| 572 | else |
| 573 | sid->cpu = -1; |
| 574 | if (!evsel->system_wide && evlist->threads && thread >= 0) |
| 575 | sid->tid = thread_map__pid(evlist->threads, thread); |
| 576 | else |
| 577 | sid->tid = -1; |
| 578 | } |
| 579 | |
| 580 | struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id) |
| 581 | { |
| 582 | struct hlist_head *head; |
| 583 | struct perf_sample_id *sid; |
| 584 | int hash; |
| 585 | |
| 586 | hash = hash_64(id, PERF_EVLIST__HLIST_BITS); |
| 587 | head = &evlist->heads[hash]; |
| 588 | |
| 589 | hlist_for_each_entry(sid, head, node) |
| 590 | if (sid->id == id) |
| 591 | return sid; |
| 592 | |
| 593 | return NULL; |
| 594 | } |
| 595 | |
| 596 | struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id) |
| 597 | { |
| 598 | struct perf_sample_id *sid; |
| 599 | |
| 600 | if (evlist->nr_entries == 1 || !id) |
| 601 | return perf_evlist__first(evlist); |
| 602 | |
| 603 | sid = perf_evlist__id2sid(evlist, id); |
| 604 | if (sid) |
| 605 | return sid->evsel; |
| 606 | |
| 607 | if (!perf_evlist__sample_id_all(evlist)) |
| 608 | return perf_evlist__first(evlist); |
| 609 | |
| 610 | return NULL; |
| 611 | } |
| 612 | |
| 613 | struct perf_evsel *perf_evlist__id2evsel_strict(struct perf_evlist *evlist, |
| 614 | u64 id) |
| 615 | { |
| 616 | struct perf_sample_id *sid; |
| 617 | |
| 618 | if (!id) |
| 619 | return NULL; |
| 620 | |
| 621 | sid = perf_evlist__id2sid(evlist, id); |
| 622 | if (sid) |
| 623 | return sid->evsel; |
| 624 | |
| 625 | return NULL; |
| 626 | } |
| 627 | |
| 628 | static int perf_evlist__event2id(struct perf_evlist *evlist, |
| 629 | union perf_event *event, u64 *id) |
| 630 | { |
| 631 | const u64 *array = event->sample.array; |
| 632 | ssize_t n; |
| 633 | |
| 634 | n = (event->header.size - sizeof(event->header)) >> 3; |
| 635 | |
| 636 | if (event->header.type == PERF_RECORD_SAMPLE) { |
| 637 | if (evlist->id_pos >= n) |
| 638 | return -1; |
| 639 | *id = array[evlist->id_pos]; |
| 640 | } else { |
| 641 | if (evlist->is_pos > n) |
| 642 | return -1; |
| 643 | n -= evlist->is_pos; |
| 644 | *id = array[n]; |
| 645 | } |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist, |
| 650 | union perf_event *event) |
| 651 | { |
| 652 | struct perf_evsel *first = perf_evlist__first(evlist); |
| 653 | struct hlist_head *head; |
| 654 | struct perf_sample_id *sid; |
| 655 | int hash; |
| 656 | u64 id; |
| 657 | |
| 658 | if (evlist->nr_entries == 1) |
| 659 | return first; |
| 660 | |
| 661 | if (!first->attr.sample_id_all && |
| 662 | event->header.type != PERF_RECORD_SAMPLE) |
| 663 | return first; |
| 664 | |
| 665 | if (perf_evlist__event2id(evlist, event, &id)) |
| 666 | return NULL; |
| 667 | |
| 668 | /* Synthesized events have an id of zero */ |
| 669 | if (!id) |
| 670 | return first; |
| 671 | |
| 672 | hash = hash_64(id, PERF_EVLIST__HLIST_BITS); |
| 673 | head = &evlist->heads[hash]; |
| 674 | |
| 675 | hlist_for_each_entry(sid, head, node) { |
| 676 | if (sid->id == id) |
| 677 | return sid->evsel; |
| 678 | } |
| 679 | return NULL; |
| 680 | } |
| 681 | |
| 682 | union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx) |
| 683 | { |
| 684 | struct perf_mmap *md = &evlist->mmap[idx]; |
| 685 | u64 head; |
| 686 | u64 old = md->prev; |
| 687 | unsigned char *data = md->base + page_size; |
| 688 | union perf_event *event = NULL; |
| 689 | |
| 690 | /* |
| 691 | * Check if event was unmapped due to a POLLHUP/POLLERR. |
| 692 | */ |
| 693 | if (!atomic_read(&md->refcnt)) |
| 694 | return NULL; |
| 695 | |
| 696 | head = perf_mmap__read_head(md); |
| 697 | if (evlist->overwrite) { |
| 698 | /* |
| 699 | * If we're further behind than half the buffer, there's a chance |
| 700 | * the writer will bite our tail and mess up the samples under us. |
| 701 | * |
| 702 | * If we somehow ended up ahead of the head, we got messed up. |
| 703 | * |
| 704 | * In either case, truncate and restart at head. |
| 705 | */ |
| 706 | int diff = head - old; |
| 707 | if (diff > md->mask / 2 || diff < 0) { |
| 708 | fprintf(stderr, "WARNING: failed to keep up with mmap data.\n"); |
| 709 | |
| 710 | /* |
| 711 | * head points to a known good entry, start there. |
| 712 | */ |
| 713 | old = head; |
| 714 | } |
| 715 | } |
| 716 | |
| 717 | if (old != head) { |
| 718 | size_t size; |
| 719 | |
| 720 | event = (union perf_event *)&data[old & md->mask]; |
| 721 | size = event->header.size; |
| 722 | |
| 723 | /* |
| 724 | * Event straddles the mmap boundary -- header should always |
| 725 | * be inside due to u64 alignment of output. |
| 726 | */ |
| 727 | if ((old & md->mask) + size != ((old + size) & md->mask)) { |
| 728 | unsigned int offset = old; |
| 729 | unsigned int len = min(sizeof(*event), size), cpy; |
| 730 | void *dst = md->event_copy; |
| 731 | |
| 732 | do { |
| 733 | cpy = min(md->mask + 1 - (offset & md->mask), len); |
| 734 | memcpy(dst, &data[offset & md->mask], cpy); |
| 735 | offset += cpy; |
| 736 | dst += cpy; |
| 737 | len -= cpy; |
| 738 | } while (len); |
| 739 | |
| 740 | event = (union perf_event *) md->event_copy; |
| 741 | } |
| 742 | |
| 743 | old += size; |
| 744 | } |
| 745 | |
| 746 | md->prev = old; |
| 747 | |
| 748 | return event; |
| 749 | } |
| 750 | |
| 751 | static bool perf_mmap__empty(struct perf_mmap *md) |
| 752 | { |
| 753 | return perf_mmap__read_head(md) == md->prev && !md->auxtrace_mmap.base; |
| 754 | } |
| 755 | |
| 756 | static void perf_evlist__mmap_get(struct perf_evlist *evlist, int idx) |
| 757 | { |
| 758 | atomic_inc(&evlist->mmap[idx].refcnt); |
| 759 | } |
| 760 | |
| 761 | static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx) |
| 762 | { |
| 763 | BUG_ON(atomic_read(&evlist->mmap[idx].refcnt) == 0); |
| 764 | |
| 765 | if (atomic_dec_and_test(&evlist->mmap[idx].refcnt)) |
| 766 | __perf_evlist__munmap(evlist, idx); |
| 767 | } |
| 768 | |
| 769 | void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx) |
| 770 | { |
| 771 | struct perf_mmap *md = &evlist->mmap[idx]; |
| 772 | |
| 773 | if (!evlist->overwrite) { |
| 774 | u64 old = md->prev; |
| 775 | |
| 776 | perf_mmap__write_tail(md, old); |
| 777 | } |
| 778 | |
| 779 | if (atomic_read(&md->refcnt) == 1 && perf_mmap__empty(md)) |
| 780 | perf_evlist__mmap_put(evlist, idx); |
| 781 | } |
| 782 | |
| 783 | int __weak auxtrace_mmap__mmap(struct auxtrace_mmap *mm __maybe_unused, |
| 784 | struct auxtrace_mmap_params *mp __maybe_unused, |
| 785 | void *userpg __maybe_unused, |
| 786 | int fd __maybe_unused) |
| 787 | { |
| 788 | return 0; |
| 789 | } |
| 790 | |
| 791 | void __weak auxtrace_mmap__munmap(struct auxtrace_mmap *mm __maybe_unused) |
| 792 | { |
| 793 | } |
| 794 | |
| 795 | void __weak auxtrace_mmap_params__init( |
| 796 | struct auxtrace_mmap_params *mp __maybe_unused, |
| 797 | off_t auxtrace_offset __maybe_unused, |
| 798 | unsigned int auxtrace_pages __maybe_unused, |
| 799 | bool auxtrace_overwrite __maybe_unused) |
| 800 | { |
| 801 | } |
| 802 | |
| 803 | void __weak auxtrace_mmap_params__set_idx( |
| 804 | struct auxtrace_mmap_params *mp __maybe_unused, |
| 805 | struct perf_evlist *evlist __maybe_unused, |
| 806 | int idx __maybe_unused, |
| 807 | bool per_cpu __maybe_unused) |
| 808 | { |
| 809 | } |
| 810 | |
| 811 | static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx) |
| 812 | { |
| 813 | if (evlist->mmap[idx].base != NULL) { |
| 814 | munmap(evlist->mmap[idx].base, evlist->mmap_len); |
| 815 | evlist->mmap[idx].base = NULL; |
| 816 | atomic_set(&evlist->mmap[idx].refcnt, 0); |
| 817 | } |
| 818 | auxtrace_mmap__munmap(&evlist->mmap[idx].auxtrace_mmap); |
| 819 | } |
| 820 | |
| 821 | void perf_evlist__munmap(struct perf_evlist *evlist) |
| 822 | { |
| 823 | int i; |
| 824 | |
| 825 | if (evlist->mmap == NULL) |
| 826 | return; |
| 827 | |
| 828 | for (i = 0; i < evlist->nr_mmaps; i++) |
| 829 | __perf_evlist__munmap(evlist, i); |
| 830 | |
| 831 | zfree(&evlist->mmap); |
| 832 | } |
| 833 | |
| 834 | static int perf_evlist__alloc_mmap(struct perf_evlist *evlist) |
| 835 | { |
| 836 | evlist->nr_mmaps = cpu_map__nr(evlist->cpus); |
| 837 | if (cpu_map__empty(evlist->cpus)) |
| 838 | evlist->nr_mmaps = thread_map__nr(evlist->threads); |
| 839 | evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap)); |
| 840 | return evlist->mmap != NULL ? 0 : -ENOMEM; |
| 841 | } |
| 842 | |
| 843 | struct mmap_params { |
| 844 | int prot; |
| 845 | int mask; |
| 846 | struct auxtrace_mmap_params auxtrace_mp; |
| 847 | }; |
| 848 | |
| 849 | static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx, |
| 850 | struct mmap_params *mp, int fd) |
| 851 | { |
| 852 | /* |
| 853 | * The last one will be done at perf_evlist__mmap_consume(), so that we |
| 854 | * make sure we don't prevent tools from consuming every last event in |
| 855 | * the ring buffer. |
| 856 | * |
| 857 | * I.e. we can get the POLLHUP meaning that the fd doesn't exist |
| 858 | * anymore, but the last events for it are still in the ring buffer, |
| 859 | * waiting to be consumed. |
| 860 | * |
| 861 | * Tools can chose to ignore this at their own discretion, but the |
| 862 | * evlist layer can't just drop it when filtering events in |
| 863 | * perf_evlist__filter_pollfd(). |
| 864 | */ |
| 865 | atomic_set(&evlist->mmap[idx].refcnt, 2); |
| 866 | evlist->mmap[idx].prev = 0; |
| 867 | evlist->mmap[idx].mask = mp->mask; |
| 868 | evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, mp->prot, |
| 869 | MAP_SHARED, fd, 0); |
| 870 | if (evlist->mmap[idx].base == MAP_FAILED) { |
| 871 | pr_debug2("failed to mmap perf event ring buffer, error %d\n", |
| 872 | errno); |
| 873 | evlist->mmap[idx].base = NULL; |
| 874 | return -1; |
| 875 | } |
| 876 | |
| 877 | if (auxtrace_mmap__mmap(&evlist->mmap[idx].auxtrace_mmap, |
| 878 | &mp->auxtrace_mp, evlist->mmap[idx].base, fd)) |
| 879 | return -1; |
| 880 | |
| 881 | return 0; |
| 882 | } |
| 883 | |
| 884 | static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx, |
| 885 | struct mmap_params *mp, int cpu, |
| 886 | int thread, int *output) |
| 887 | { |
| 888 | struct perf_evsel *evsel; |
| 889 | |
| 890 | evlist__for_each(evlist, evsel) { |
| 891 | int fd; |
| 892 | |
| 893 | if (evsel->system_wide && thread) |
| 894 | continue; |
| 895 | |
| 896 | fd = FD(evsel, cpu, thread); |
| 897 | |
| 898 | if (*output == -1) { |
| 899 | *output = fd; |
| 900 | if (__perf_evlist__mmap(evlist, idx, mp, *output) < 0) |
| 901 | return -1; |
| 902 | } else { |
| 903 | if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0) |
| 904 | return -1; |
| 905 | |
| 906 | perf_evlist__mmap_get(evlist, idx); |
| 907 | } |
| 908 | |
| 909 | /* |
| 910 | * The system_wide flag causes a selected event to be opened |
| 911 | * always without a pid. Consequently it will never get a |
| 912 | * POLLHUP, but it is used for tracking in combination with |
| 913 | * other events, so it should not need to be polled anyway. |
| 914 | * Therefore don't add it for polling. |
| 915 | */ |
| 916 | if (!evsel->system_wide && |
| 917 | __perf_evlist__add_pollfd(evlist, fd, idx) < 0) { |
| 918 | perf_evlist__mmap_put(evlist, idx); |
| 919 | return -1; |
| 920 | } |
| 921 | |
| 922 | if (evsel->attr.read_format & PERF_FORMAT_ID) { |
| 923 | if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread, |
| 924 | fd) < 0) |
| 925 | return -1; |
| 926 | perf_evlist__set_sid_idx(evlist, evsel, idx, cpu, |
| 927 | thread); |
| 928 | } |
| 929 | } |
| 930 | |
| 931 | return 0; |
| 932 | } |
| 933 | |
| 934 | static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, |
| 935 | struct mmap_params *mp) |
| 936 | { |
| 937 | int cpu, thread; |
| 938 | int nr_cpus = cpu_map__nr(evlist->cpus); |
| 939 | int nr_threads = thread_map__nr(evlist->threads); |
| 940 | |
| 941 | pr_debug2("perf event ring buffer mmapped per cpu\n"); |
| 942 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
| 943 | int output = -1; |
| 944 | |
| 945 | auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu, |
| 946 | true); |
| 947 | |
| 948 | for (thread = 0; thread < nr_threads; thread++) { |
| 949 | if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu, |
| 950 | thread, &output)) |
| 951 | goto out_unmap; |
| 952 | } |
| 953 | } |
| 954 | |
| 955 | return 0; |
| 956 | |
| 957 | out_unmap: |
| 958 | for (cpu = 0; cpu < nr_cpus; cpu++) |
| 959 | __perf_evlist__munmap(evlist, cpu); |
| 960 | return -1; |
| 961 | } |
| 962 | |
| 963 | static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, |
| 964 | struct mmap_params *mp) |
| 965 | { |
| 966 | int thread; |
| 967 | int nr_threads = thread_map__nr(evlist->threads); |
| 968 | |
| 969 | pr_debug2("perf event ring buffer mmapped per thread\n"); |
| 970 | for (thread = 0; thread < nr_threads; thread++) { |
| 971 | int output = -1; |
| 972 | |
| 973 | auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread, |
| 974 | false); |
| 975 | |
| 976 | if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread, |
| 977 | &output)) |
| 978 | goto out_unmap; |
| 979 | } |
| 980 | |
| 981 | return 0; |
| 982 | |
| 983 | out_unmap: |
| 984 | for (thread = 0; thread < nr_threads; thread++) |
| 985 | __perf_evlist__munmap(evlist, thread); |
| 986 | return -1; |
| 987 | } |
| 988 | |
| 989 | static size_t perf_evlist__mmap_size(unsigned long pages) |
| 990 | { |
| 991 | if (pages == UINT_MAX) { |
| 992 | int max; |
| 993 | |
| 994 | if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) { |
| 995 | /* |
| 996 | * Pick a once upon a time good value, i.e. things look |
| 997 | * strange since we can't read a sysctl value, but lets not |
| 998 | * die yet... |
| 999 | */ |
| 1000 | max = 512; |
| 1001 | } else { |
| 1002 | max -= (page_size / 1024); |
| 1003 | } |
| 1004 | |
| 1005 | pages = (max * 1024) / page_size; |
| 1006 | if (!is_power_of_2(pages)) |
| 1007 | pages = rounddown_pow_of_two(pages); |
| 1008 | } else if (!is_power_of_2(pages)) |
| 1009 | return 0; |
| 1010 | |
| 1011 | return (pages + 1) * page_size; |
| 1012 | } |
| 1013 | |
| 1014 | static long parse_pages_arg(const char *str, unsigned long min, |
| 1015 | unsigned long max) |
| 1016 | { |
| 1017 | unsigned long pages, val; |
| 1018 | static struct parse_tag tags[] = { |
| 1019 | { .tag = 'B', .mult = 1 }, |
| 1020 | { .tag = 'K', .mult = 1 << 10 }, |
| 1021 | { .tag = 'M', .mult = 1 << 20 }, |
| 1022 | { .tag = 'G', .mult = 1 << 30 }, |
| 1023 | { .tag = 0 }, |
| 1024 | }; |
| 1025 | |
| 1026 | if (str == NULL) |
| 1027 | return -EINVAL; |
| 1028 | |
| 1029 | val = parse_tag_value(str, tags); |
| 1030 | if (val != (unsigned long) -1) { |
| 1031 | /* we got file size value */ |
| 1032 | pages = PERF_ALIGN(val, page_size) / page_size; |
| 1033 | } else { |
| 1034 | /* we got pages count value */ |
| 1035 | char *eptr; |
| 1036 | pages = strtoul(str, &eptr, 10); |
| 1037 | if (*eptr != '\0') |
| 1038 | return -EINVAL; |
| 1039 | } |
| 1040 | |
| 1041 | if (pages == 0 && min == 0) { |
| 1042 | /* leave number of pages at 0 */ |
| 1043 | } else if (!is_power_of_2(pages)) { |
| 1044 | /* round pages up to next power of 2 */ |
| 1045 | pages = roundup_pow_of_two(pages); |
| 1046 | if (!pages) |
| 1047 | return -EINVAL; |
| 1048 | pr_info("rounding mmap pages size to %lu bytes (%lu pages)\n", |
| 1049 | pages * page_size, pages); |
| 1050 | } |
| 1051 | |
| 1052 | if (pages > max) |
| 1053 | return -EINVAL; |
| 1054 | |
| 1055 | return pages; |
| 1056 | } |
| 1057 | |
| 1058 | int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str) |
| 1059 | { |
| 1060 | unsigned long max = UINT_MAX; |
| 1061 | long pages; |
| 1062 | |
| 1063 | if (max > SIZE_MAX / page_size) |
| 1064 | max = SIZE_MAX / page_size; |
| 1065 | |
| 1066 | pages = parse_pages_arg(str, 1, max); |
| 1067 | if (pages < 0) { |
| 1068 | pr_err("Invalid argument for --mmap_pages/-m\n"); |
| 1069 | return -1; |
| 1070 | } |
| 1071 | |
| 1072 | *mmap_pages = pages; |
| 1073 | return 0; |
| 1074 | } |
| 1075 | |
| 1076 | int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str, |
| 1077 | int unset __maybe_unused) |
| 1078 | { |
| 1079 | return __perf_evlist__parse_mmap_pages(opt->value, str); |
| 1080 | } |
| 1081 | |
| 1082 | /** |
| 1083 | * perf_evlist__mmap_ex - Create mmaps to receive events. |
| 1084 | * @evlist: list of events |
| 1085 | * @pages: map length in pages |
| 1086 | * @overwrite: overwrite older events? |
| 1087 | * @auxtrace_pages - auxtrace map length in pages |
| 1088 | * @auxtrace_overwrite - overwrite older auxtrace data? |
| 1089 | * |
| 1090 | * If @overwrite is %false the user needs to signal event consumption using |
| 1091 | * perf_mmap__write_tail(). Using perf_evlist__mmap_read() does this |
| 1092 | * automatically. |
| 1093 | * |
| 1094 | * Similarly, if @auxtrace_overwrite is %false the user needs to signal data |
| 1095 | * consumption using auxtrace_mmap__write_tail(). |
| 1096 | * |
| 1097 | * Return: %0 on success, negative error code otherwise. |
| 1098 | */ |
| 1099 | int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages, |
| 1100 | bool overwrite, unsigned int auxtrace_pages, |
| 1101 | bool auxtrace_overwrite) |
| 1102 | { |
| 1103 | struct perf_evsel *evsel; |
| 1104 | const struct cpu_map *cpus = evlist->cpus; |
| 1105 | const struct thread_map *threads = evlist->threads; |
| 1106 | struct mmap_params mp = { |
| 1107 | .prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), |
| 1108 | }; |
| 1109 | |
| 1110 | if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0) |
| 1111 | return -ENOMEM; |
| 1112 | |
| 1113 | if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0) |
| 1114 | return -ENOMEM; |
| 1115 | |
| 1116 | evlist->overwrite = overwrite; |
| 1117 | evlist->mmap_len = perf_evlist__mmap_size(pages); |
| 1118 | pr_debug("mmap size %zuB\n", evlist->mmap_len); |
| 1119 | mp.mask = evlist->mmap_len - page_size - 1; |
| 1120 | |
| 1121 | auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->mmap_len, |
| 1122 | auxtrace_pages, auxtrace_overwrite); |
| 1123 | |
| 1124 | evlist__for_each(evlist, evsel) { |
| 1125 | if ((evsel->attr.read_format & PERF_FORMAT_ID) && |
| 1126 | evsel->sample_id == NULL && |
| 1127 | perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0) |
| 1128 | return -ENOMEM; |
| 1129 | } |
| 1130 | |
| 1131 | if (cpu_map__empty(cpus)) |
| 1132 | return perf_evlist__mmap_per_thread(evlist, &mp); |
| 1133 | |
| 1134 | return perf_evlist__mmap_per_cpu(evlist, &mp); |
| 1135 | } |
| 1136 | |
| 1137 | int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages, |
| 1138 | bool overwrite) |
| 1139 | { |
| 1140 | return perf_evlist__mmap_ex(evlist, pages, overwrite, 0, false); |
| 1141 | } |
| 1142 | |
| 1143 | int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target) |
| 1144 | { |
| 1145 | struct cpu_map *cpus; |
| 1146 | struct thread_map *threads; |
| 1147 | |
| 1148 | threads = thread_map__new_str(target->pid, target->tid, target->uid); |
| 1149 | |
| 1150 | if (!threads) |
| 1151 | return -1; |
| 1152 | |
| 1153 | if (target__uses_dummy_map(target)) |
| 1154 | cpus = cpu_map__dummy_new(); |
| 1155 | else |
| 1156 | cpus = cpu_map__new(target->cpu_list); |
| 1157 | |
| 1158 | if (!cpus) |
| 1159 | goto out_delete_threads; |
| 1160 | |
| 1161 | evlist->has_user_cpus = !!target->cpu_list; |
| 1162 | |
| 1163 | perf_evlist__set_maps(evlist, cpus, threads); |
| 1164 | |
| 1165 | return 0; |
| 1166 | |
| 1167 | out_delete_threads: |
| 1168 | thread_map__put(threads); |
| 1169 | return -1; |
| 1170 | } |
| 1171 | |
| 1172 | void perf_evlist__set_maps(struct perf_evlist *evlist, struct cpu_map *cpus, |
| 1173 | struct thread_map *threads) |
| 1174 | { |
| 1175 | /* |
| 1176 | * Allow for the possibility that one or another of the maps isn't being |
| 1177 | * changed i.e. don't put it. Note we are assuming the maps that are |
| 1178 | * being applied are brand new and evlist is taking ownership of the |
| 1179 | * original reference count of 1. If that is not the case it is up to |
| 1180 | * the caller to increase the reference count. |
| 1181 | */ |
| 1182 | if (cpus != evlist->cpus) { |
| 1183 | cpu_map__put(evlist->cpus); |
| 1184 | evlist->cpus = cpu_map__get(cpus); |
| 1185 | } |
| 1186 | |
| 1187 | if (threads != evlist->threads) { |
| 1188 | thread_map__put(evlist->threads); |
| 1189 | evlist->threads = thread_map__get(threads); |
| 1190 | } |
| 1191 | |
| 1192 | perf_evlist__propagate_maps(evlist); |
| 1193 | } |
| 1194 | |
| 1195 | int perf_evlist__apply_filters(struct perf_evlist *evlist, struct perf_evsel **err_evsel) |
| 1196 | { |
| 1197 | struct perf_evsel *evsel; |
| 1198 | int err = 0; |
| 1199 | const int ncpus = cpu_map__nr(evlist->cpus), |
| 1200 | nthreads = thread_map__nr(evlist->threads); |
| 1201 | |
| 1202 | evlist__for_each(evlist, evsel) { |
| 1203 | if (evsel->filter == NULL) |
| 1204 | continue; |
| 1205 | |
| 1206 | /* |
| 1207 | * filters only work for tracepoint event, which doesn't have cpu limit. |
| 1208 | * So evlist and evsel should always be same. |
| 1209 | */ |
| 1210 | err = perf_evsel__apply_filter(evsel, ncpus, nthreads, evsel->filter); |
| 1211 | if (err) { |
| 1212 | *err_evsel = evsel; |
| 1213 | break; |
| 1214 | } |
| 1215 | } |
| 1216 | |
| 1217 | return err; |
| 1218 | } |
| 1219 | |
| 1220 | int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter) |
| 1221 | { |
| 1222 | struct perf_evsel *evsel; |
| 1223 | int err = 0; |
| 1224 | |
| 1225 | evlist__for_each(evlist, evsel) { |
| 1226 | if (evsel->attr.type != PERF_TYPE_TRACEPOINT) |
| 1227 | continue; |
| 1228 | |
| 1229 | err = perf_evsel__set_filter(evsel, filter); |
| 1230 | if (err) |
| 1231 | break; |
| 1232 | } |
| 1233 | |
| 1234 | return err; |
| 1235 | } |
| 1236 | |
| 1237 | int perf_evlist__set_filter_pids(struct perf_evlist *evlist, size_t npids, pid_t *pids) |
| 1238 | { |
| 1239 | char *filter; |
| 1240 | int ret = -1; |
| 1241 | size_t i; |
| 1242 | |
| 1243 | for (i = 0; i < npids; ++i) { |
| 1244 | if (i == 0) { |
| 1245 | if (asprintf(&filter, "common_pid != %d", pids[i]) < 0) |
| 1246 | return -1; |
| 1247 | } else { |
| 1248 | char *tmp; |
| 1249 | |
| 1250 | if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0) |
| 1251 | goto out_free; |
| 1252 | |
| 1253 | free(filter); |
| 1254 | filter = tmp; |
| 1255 | } |
| 1256 | } |
| 1257 | |
| 1258 | ret = perf_evlist__set_filter(evlist, filter); |
| 1259 | out_free: |
| 1260 | free(filter); |
| 1261 | return ret; |
| 1262 | } |
| 1263 | |
| 1264 | int perf_evlist__set_filter_pid(struct perf_evlist *evlist, pid_t pid) |
| 1265 | { |
| 1266 | return perf_evlist__set_filter_pids(evlist, 1, &pid); |
| 1267 | } |
| 1268 | |
| 1269 | bool perf_evlist__valid_sample_type(struct perf_evlist *evlist) |
| 1270 | { |
| 1271 | struct perf_evsel *pos; |
| 1272 | |
| 1273 | if (evlist->nr_entries == 1) |
| 1274 | return true; |
| 1275 | |
| 1276 | if (evlist->id_pos < 0 || evlist->is_pos < 0) |
| 1277 | return false; |
| 1278 | |
| 1279 | evlist__for_each(evlist, pos) { |
| 1280 | if (pos->id_pos != evlist->id_pos || |
| 1281 | pos->is_pos != evlist->is_pos) |
| 1282 | return false; |
| 1283 | } |
| 1284 | |
| 1285 | return true; |
| 1286 | } |
| 1287 | |
| 1288 | u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist) |
| 1289 | { |
| 1290 | struct perf_evsel *evsel; |
| 1291 | |
| 1292 | if (evlist->combined_sample_type) |
| 1293 | return evlist->combined_sample_type; |
| 1294 | |
| 1295 | evlist__for_each(evlist, evsel) |
| 1296 | evlist->combined_sample_type |= evsel->attr.sample_type; |
| 1297 | |
| 1298 | return evlist->combined_sample_type; |
| 1299 | } |
| 1300 | |
| 1301 | u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist) |
| 1302 | { |
| 1303 | evlist->combined_sample_type = 0; |
| 1304 | return __perf_evlist__combined_sample_type(evlist); |
| 1305 | } |
| 1306 | |
| 1307 | u64 perf_evlist__combined_branch_type(struct perf_evlist *evlist) |
| 1308 | { |
| 1309 | struct perf_evsel *evsel; |
| 1310 | u64 branch_type = 0; |
| 1311 | |
| 1312 | evlist__for_each(evlist, evsel) |
| 1313 | branch_type |= evsel->attr.branch_sample_type; |
| 1314 | return branch_type; |
| 1315 | } |
| 1316 | |
| 1317 | bool perf_evlist__valid_read_format(struct perf_evlist *evlist) |
| 1318 | { |
| 1319 | struct perf_evsel *first = perf_evlist__first(evlist), *pos = first; |
| 1320 | u64 read_format = first->attr.read_format; |
| 1321 | u64 sample_type = first->attr.sample_type; |
| 1322 | |
| 1323 | evlist__for_each(evlist, pos) { |
| 1324 | if (read_format != pos->attr.read_format) |
| 1325 | return false; |
| 1326 | } |
| 1327 | |
| 1328 | /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */ |
| 1329 | if ((sample_type & PERF_SAMPLE_READ) && |
| 1330 | !(read_format & PERF_FORMAT_ID)) { |
| 1331 | return false; |
| 1332 | } |
| 1333 | |
| 1334 | return true; |
| 1335 | } |
| 1336 | |
| 1337 | u64 perf_evlist__read_format(struct perf_evlist *evlist) |
| 1338 | { |
| 1339 | struct perf_evsel *first = perf_evlist__first(evlist); |
| 1340 | return first->attr.read_format; |
| 1341 | } |
| 1342 | |
| 1343 | u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist) |
| 1344 | { |
| 1345 | struct perf_evsel *first = perf_evlist__first(evlist); |
| 1346 | struct perf_sample *data; |
| 1347 | u64 sample_type; |
| 1348 | u16 size = 0; |
| 1349 | |
| 1350 | if (!first->attr.sample_id_all) |
| 1351 | goto out; |
| 1352 | |
| 1353 | sample_type = first->attr.sample_type; |
| 1354 | |
| 1355 | if (sample_type & PERF_SAMPLE_TID) |
| 1356 | size += sizeof(data->tid) * 2; |
| 1357 | |
| 1358 | if (sample_type & PERF_SAMPLE_TIME) |
| 1359 | size += sizeof(data->time); |
| 1360 | |
| 1361 | if (sample_type & PERF_SAMPLE_ID) |
| 1362 | size += sizeof(data->id); |
| 1363 | |
| 1364 | if (sample_type & PERF_SAMPLE_STREAM_ID) |
| 1365 | size += sizeof(data->stream_id); |
| 1366 | |
| 1367 | if (sample_type & PERF_SAMPLE_CPU) |
| 1368 | size += sizeof(data->cpu) * 2; |
| 1369 | |
| 1370 | if (sample_type & PERF_SAMPLE_IDENTIFIER) |
| 1371 | size += sizeof(data->id); |
| 1372 | out: |
| 1373 | return size; |
| 1374 | } |
| 1375 | |
| 1376 | bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist) |
| 1377 | { |
| 1378 | struct perf_evsel *first = perf_evlist__first(evlist), *pos = first; |
| 1379 | |
| 1380 | evlist__for_each_continue(evlist, pos) { |
| 1381 | if (first->attr.sample_id_all != pos->attr.sample_id_all) |
| 1382 | return false; |
| 1383 | } |
| 1384 | |
| 1385 | return true; |
| 1386 | } |
| 1387 | |
| 1388 | bool perf_evlist__sample_id_all(struct perf_evlist *evlist) |
| 1389 | { |
| 1390 | struct perf_evsel *first = perf_evlist__first(evlist); |
| 1391 | return first->attr.sample_id_all; |
| 1392 | } |
| 1393 | |
| 1394 | void perf_evlist__set_selected(struct perf_evlist *evlist, |
| 1395 | struct perf_evsel *evsel) |
| 1396 | { |
| 1397 | evlist->selected = evsel; |
| 1398 | } |
| 1399 | |
| 1400 | void perf_evlist__close(struct perf_evlist *evlist) |
| 1401 | { |
| 1402 | struct perf_evsel *evsel; |
| 1403 | int ncpus = cpu_map__nr(evlist->cpus); |
| 1404 | int nthreads = thread_map__nr(evlist->threads); |
| 1405 | int n; |
| 1406 | |
| 1407 | evlist__for_each_reverse(evlist, evsel) { |
| 1408 | n = evsel->cpus ? evsel->cpus->nr : ncpus; |
| 1409 | perf_evsel__close(evsel, n, nthreads); |
| 1410 | } |
| 1411 | } |
| 1412 | |
| 1413 | static int perf_evlist__create_syswide_maps(struct perf_evlist *evlist) |
| 1414 | { |
| 1415 | struct cpu_map *cpus; |
| 1416 | struct thread_map *threads; |
| 1417 | int err = -ENOMEM; |
| 1418 | |
| 1419 | /* |
| 1420 | * Try reading /sys/devices/system/cpu/online to get |
| 1421 | * an all cpus map. |
| 1422 | * |
| 1423 | * FIXME: -ENOMEM is the best we can do here, the cpu_map |
| 1424 | * code needs an overhaul to properly forward the |
| 1425 | * error, and we may not want to do that fallback to a |
| 1426 | * default cpu identity map :-\ |
| 1427 | */ |
| 1428 | cpus = cpu_map__new(NULL); |
| 1429 | if (!cpus) |
| 1430 | goto out; |
| 1431 | |
| 1432 | threads = thread_map__new_dummy(); |
| 1433 | if (!threads) |
| 1434 | goto out_put; |
| 1435 | |
| 1436 | perf_evlist__set_maps(evlist, cpus, threads); |
| 1437 | out: |
| 1438 | return err; |
| 1439 | out_put: |
| 1440 | cpu_map__put(cpus); |
| 1441 | goto out; |
| 1442 | } |
| 1443 | |
| 1444 | int perf_evlist__open(struct perf_evlist *evlist) |
| 1445 | { |
| 1446 | struct perf_evsel *evsel; |
| 1447 | int err; |
| 1448 | |
| 1449 | /* |
| 1450 | * Default: one fd per CPU, all threads, aka systemwide |
| 1451 | * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL |
| 1452 | */ |
| 1453 | if (evlist->threads == NULL && evlist->cpus == NULL) { |
| 1454 | err = perf_evlist__create_syswide_maps(evlist); |
| 1455 | if (err < 0) |
| 1456 | goto out_err; |
| 1457 | } |
| 1458 | |
| 1459 | perf_evlist__update_id_pos(evlist); |
| 1460 | |
| 1461 | evlist__for_each(evlist, evsel) { |
| 1462 | err = perf_evsel__open(evsel, evsel->cpus, evsel->threads); |
| 1463 | if (err < 0) |
| 1464 | goto out_err; |
| 1465 | } |
| 1466 | |
| 1467 | return 0; |
| 1468 | out_err: |
| 1469 | perf_evlist__close(evlist); |
| 1470 | errno = -err; |
| 1471 | return err; |
| 1472 | } |
| 1473 | |
| 1474 | int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *target, |
| 1475 | const char *argv[], bool pipe_output, |
| 1476 | void (*exec_error)(int signo, siginfo_t *info, void *ucontext)) |
| 1477 | { |
| 1478 | int child_ready_pipe[2], go_pipe[2]; |
| 1479 | char bf; |
| 1480 | |
| 1481 | if (pipe(child_ready_pipe) < 0) { |
| 1482 | perror("failed to create 'ready' pipe"); |
| 1483 | return -1; |
| 1484 | } |
| 1485 | |
| 1486 | if (pipe(go_pipe) < 0) { |
| 1487 | perror("failed to create 'go' pipe"); |
| 1488 | goto out_close_ready_pipe; |
| 1489 | } |
| 1490 | |
| 1491 | evlist->workload.pid = fork(); |
| 1492 | if (evlist->workload.pid < 0) { |
| 1493 | perror("failed to fork"); |
| 1494 | goto out_close_pipes; |
| 1495 | } |
| 1496 | |
| 1497 | if (!evlist->workload.pid) { |
| 1498 | int ret; |
| 1499 | |
| 1500 | if (pipe_output) |
| 1501 | dup2(2, 1); |
| 1502 | |
| 1503 | signal(SIGTERM, SIG_DFL); |
| 1504 | |
| 1505 | close(child_ready_pipe[0]); |
| 1506 | close(go_pipe[1]); |
| 1507 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); |
| 1508 | |
| 1509 | /* |
| 1510 | * Tell the parent we're ready to go |
| 1511 | */ |
| 1512 | close(child_ready_pipe[1]); |
| 1513 | |
| 1514 | /* |
| 1515 | * Wait until the parent tells us to go. |
| 1516 | */ |
| 1517 | ret = read(go_pipe[0], &bf, 1); |
| 1518 | /* |
| 1519 | * The parent will ask for the execvp() to be performed by |
| 1520 | * writing exactly one byte, in workload.cork_fd, usually via |
| 1521 | * perf_evlist__start_workload(). |
| 1522 | * |
| 1523 | * For cancelling the workload without actually running it, |
| 1524 | * the parent will just close workload.cork_fd, without writing |
| 1525 | * anything, i.e. read will return zero and we just exit() |
| 1526 | * here. |
| 1527 | */ |
| 1528 | if (ret != 1) { |
| 1529 | if (ret == -1) |
| 1530 | perror("unable to read pipe"); |
| 1531 | exit(ret); |
| 1532 | } |
| 1533 | |
| 1534 | execvp(argv[0], (char **)argv); |
| 1535 | |
| 1536 | if (exec_error) { |
| 1537 | union sigval val; |
| 1538 | |
| 1539 | val.sival_int = errno; |
| 1540 | if (sigqueue(getppid(), SIGUSR1, val)) |
| 1541 | perror(argv[0]); |
| 1542 | } else |
| 1543 | perror(argv[0]); |
| 1544 | exit(-1); |
| 1545 | } |
| 1546 | |
| 1547 | if (exec_error) { |
| 1548 | struct sigaction act = { |
| 1549 | .sa_flags = SA_SIGINFO, |
| 1550 | .sa_sigaction = exec_error, |
| 1551 | }; |
| 1552 | sigaction(SIGUSR1, &act, NULL); |
| 1553 | } |
| 1554 | |
| 1555 | if (target__none(target)) { |
| 1556 | if (evlist->threads == NULL) { |
| 1557 | fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n", |
| 1558 | __func__, __LINE__); |
| 1559 | goto out_close_pipes; |
| 1560 | } |
| 1561 | thread_map__set_pid(evlist->threads, 0, evlist->workload.pid); |
| 1562 | } |
| 1563 | |
| 1564 | close(child_ready_pipe[1]); |
| 1565 | close(go_pipe[0]); |
| 1566 | /* |
| 1567 | * wait for child to settle |
| 1568 | */ |
| 1569 | if (read(child_ready_pipe[0], &bf, 1) == -1) { |
| 1570 | perror("unable to read pipe"); |
| 1571 | goto out_close_pipes; |
| 1572 | } |
| 1573 | |
| 1574 | fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC); |
| 1575 | evlist->workload.cork_fd = go_pipe[1]; |
| 1576 | close(child_ready_pipe[0]); |
| 1577 | return 0; |
| 1578 | |
| 1579 | out_close_pipes: |
| 1580 | close(go_pipe[0]); |
| 1581 | close(go_pipe[1]); |
| 1582 | out_close_ready_pipe: |
| 1583 | close(child_ready_pipe[0]); |
| 1584 | close(child_ready_pipe[1]); |
| 1585 | return -1; |
| 1586 | } |
| 1587 | |
| 1588 | int perf_evlist__start_workload(struct perf_evlist *evlist) |
| 1589 | { |
| 1590 | if (evlist->workload.cork_fd > 0) { |
| 1591 | char bf = 0; |
| 1592 | int ret; |
| 1593 | /* |
| 1594 | * Remove the cork, let it rip! |
| 1595 | */ |
| 1596 | ret = write(evlist->workload.cork_fd, &bf, 1); |
| 1597 | if (ret < 0) |
| 1598 | perror("enable to write to pipe"); |
| 1599 | |
| 1600 | close(evlist->workload.cork_fd); |
| 1601 | return ret; |
| 1602 | } |
| 1603 | |
| 1604 | return 0; |
| 1605 | } |
| 1606 | |
| 1607 | int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event, |
| 1608 | struct perf_sample *sample) |
| 1609 | { |
| 1610 | struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event); |
| 1611 | |
| 1612 | if (!evsel) |
| 1613 | return -EFAULT; |
| 1614 | return perf_evsel__parse_sample(evsel, event, sample); |
| 1615 | } |
| 1616 | |
| 1617 | size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp) |
| 1618 | { |
| 1619 | struct perf_evsel *evsel; |
| 1620 | size_t printed = 0; |
| 1621 | |
| 1622 | evlist__for_each(evlist, evsel) { |
| 1623 | printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "", |
| 1624 | perf_evsel__name(evsel)); |
| 1625 | } |
| 1626 | |
| 1627 | return printed + fprintf(fp, "\n"); |
| 1628 | } |
| 1629 | |
| 1630 | int perf_evlist__strerror_open(struct perf_evlist *evlist, |
| 1631 | int err, char *buf, size_t size) |
| 1632 | { |
| 1633 | int printed, value; |
| 1634 | char sbuf[STRERR_BUFSIZE], *emsg = strerror_r(err, sbuf, sizeof(sbuf)); |
| 1635 | |
| 1636 | switch (err) { |
| 1637 | case EACCES: |
| 1638 | case EPERM: |
| 1639 | printed = scnprintf(buf, size, |
| 1640 | "Error:\t%s.\n" |
| 1641 | "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg); |
| 1642 | |
| 1643 | value = perf_event_paranoid(); |
| 1644 | |
| 1645 | printed += scnprintf(buf + printed, size - printed, "\nHint:\t"); |
| 1646 | |
| 1647 | if (value >= 2) { |
| 1648 | printed += scnprintf(buf + printed, size - printed, |
| 1649 | "For your workloads it needs to be <= 1\nHint:\t"); |
| 1650 | } |
| 1651 | printed += scnprintf(buf + printed, size - printed, |
| 1652 | "For system wide tracing it needs to be set to -1.\n"); |
| 1653 | |
| 1654 | printed += scnprintf(buf + printed, size - printed, |
| 1655 | "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n" |
| 1656 | "Hint:\tThe current value is %d.", value); |
| 1657 | break; |
| 1658 | case EINVAL: { |
| 1659 | struct perf_evsel *first = perf_evlist__first(evlist); |
| 1660 | int max_freq; |
| 1661 | |
| 1662 | if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0) |
| 1663 | goto out_default; |
| 1664 | |
| 1665 | if (first->attr.sample_freq < (u64)max_freq) |
| 1666 | goto out_default; |
| 1667 | |
| 1668 | printed = scnprintf(buf, size, |
| 1669 | "Error:\t%s.\n" |
| 1670 | "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n" |
| 1671 | "Hint:\tThe current value is %d and %" PRIu64 " is being requested.", |
| 1672 | emsg, max_freq, first->attr.sample_freq); |
| 1673 | break; |
| 1674 | } |
| 1675 | default: |
| 1676 | out_default: |
| 1677 | scnprintf(buf, size, "%s", emsg); |
| 1678 | break; |
| 1679 | } |
| 1680 | |
| 1681 | return 0; |
| 1682 | } |
| 1683 | |
| 1684 | int perf_evlist__strerror_mmap(struct perf_evlist *evlist, int err, char *buf, size_t size) |
| 1685 | { |
| 1686 | char sbuf[STRERR_BUFSIZE], *emsg = strerror_r(err, sbuf, sizeof(sbuf)); |
| 1687 | int pages_attempted = evlist->mmap_len / 1024, pages_max_per_user, printed = 0; |
| 1688 | |
| 1689 | switch (err) { |
| 1690 | case EPERM: |
| 1691 | sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user); |
| 1692 | printed += scnprintf(buf + printed, size - printed, |
| 1693 | "Error:\t%s.\n" |
| 1694 | "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n" |
| 1695 | "Hint:\tTried using %zd kB.\n", |
| 1696 | emsg, pages_max_per_user, pages_attempted); |
| 1697 | |
| 1698 | if (pages_attempted >= pages_max_per_user) { |
| 1699 | printed += scnprintf(buf + printed, size - printed, |
| 1700 | "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n", |
| 1701 | pages_max_per_user + pages_attempted); |
| 1702 | } |
| 1703 | |
| 1704 | printed += scnprintf(buf + printed, size - printed, |
| 1705 | "Hint:\tTry using a smaller -m/--mmap-pages value."); |
| 1706 | break; |
| 1707 | default: |
| 1708 | scnprintf(buf, size, "%s", emsg); |
| 1709 | break; |
| 1710 | } |
| 1711 | |
| 1712 | return 0; |
| 1713 | } |
| 1714 | |
| 1715 | void perf_evlist__to_front(struct perf_evlist *evlist, |
| 1716 | struct perf_evsel *move_evsel) |
| 1717 | { |
| 1718 | struct perf_evsel *evsel, *n; |
| 1719 | LIST_HEAD(move); |
| 1720 | |
| 1721 | if (move_evsel == perf_evlist__first(evlist)) |
| 1722 | return; |
| 1723 | |
| 1724 | evlist__for_each_safe(evlist, n, evsel) { |
| 1725 | if (evsel->leader == move_evsel->leader) |
| 1726 | list_move_tail(&evsel->node, &move); |
| 1727 | } |
| 1728 | |
| 1729 | list_splice(&move, &evlist->entries); |
| 1730 | } |
| 1731 | |
| 1732 | void perf_evlist__set_tracking_event(struct perf_evlist *evlist, |
| 1733 | struct perf_evsel *tracking_evsel) |
| 1734 | { |
| 1735 | struct perf_evsel *evsel; |
| 1736 | |
| 1737 | if (tracking_evsel->tracking) |
| 1738 | return; |
| 1739 | |
| 1740 | evlist__for_each(evlist, evsel) { |
| 1741 | if (evsel != tracking_evsel) |
| 1742 | evsel->tracking = false; |
| 1743 | } |
| 1744 | |
| 1745 | tracking_evsel->tracking = true; |
| 1746 | } |
| 1747 | |
| 1748 | struct perf_evsel * |
| 1749 | perf_evlist__find_evsel_by_str(struct perf_evlist *evlist, |
| 1750 | const char *str) |
| 1751 | { |
| 1752 | struct perf_evsel *evsel; |
| 1753 | |
| 1754 | evlist__for_each(evlist, evsel) { |
| 1755 | if (!evsel->name) |
| 1756 | continue; |
| 1757 | if (strcmp(str, evsel->name) == 0) |
| 1758 | return evsel; |
| 1759 | } |
| 1760 | |
| 1761 | return NULL; |
| 1762 | } |