| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * builtin-record.c |
| 4 | * |
| 5 | * Builtin record command: Record the profile of a workload |
| 6 | * (or a CPU, or a PID) into the perf.data output file - for |
| 7 | * later analysis via perf report. |
| 8 | */ |
| 9 | #include "builtin.h" |
| 10 | |
| 11 | #include "perf.h" |
| 12 | |
| 13 | #include "util/build-id.h" |
| 14 | #include "util/util.h" |
| 15 | #include <subcmd/parse-options.h> |
| 16 | #include "util/parse-events.h" |
| 17 | #include "util/config.h" |
| 18 | |
| 19 | #include "util/callchain.h" |
| 20 | #include "util/cgroup.h" |
| 21 | #include "util/header.h" |
| 22 | #include "util/event.h" |
| 23 | #include "util/evlist.h" |
| 24 | #include "util/evsel.h" |
| 25 | #include "util/debug.h" |
| 26 | #include "util/session.h" |
| 27 | #include "util/tool.h" |
| 28 | #include "util/symbol.h" |
| 29 | #include "util/cpumap.h" |
| 30 | #include "util/thread_map.h" |
| 31 | #include "util/data.h" |
| 32 | #include "util/perf_regs.h" |
| 33 | #include "util/auxtrace.h" |
| 34 | #include "util/tsc.h" |
| 35 | #include "util/parse-branch-options.h" |
| 36 | #include "util/parse-regs-options.h" |
| 37 | #include "util/llvm-utils.h" |
| 38 | #include "util/bpf-loader.h" |
| 39 | #include "util/trigger.h" |
| 40 | #include "util/perf-hooks.h" |
| 41 | #include "util/cpu-set-sched.h" |
| 42 | #include "util/time-utils.h" |
| 43 | #include "util/units.h" |
| 44 | #include "util/bpf-event.h" |
| 45 | #include "asm/bug.h" |
| 46 | |
| 47 | #include <errno.h> |
| 48 | #include <inttypes.h> |
| 49 | #include <locale.h> |
| 50 | #include <poll.h> |
| 51 | #include <unistd.h> |
| 52 | #include <sched.h> |
| 53 | #include <signal.h> |
| 54 | #include <sys/mman.h> |
| 55 | #include <sys/wait.h> |
| 56 | #include <linux/time64.h> |
| 57 | |
| 58 | struct switch_output { |
| 59 | bool enabled; |
| 60 | bool signal; |
| 61 | unsigned long size; |
| 62 | unsigned long time; |
| 63 | const char *str; |
| 64 | bool set; |
| 65 | char **filenames; |
| 66 | int num_files; |
| 67 | int cur_file; |
| 68 | }; |
| 69 | |
| 70 | struct record { |
| 71 | struct perf_tool tool; |
| 72 | struct record_opts opts; |
| 73 | u64 bytes_written; |
| 74 | struct perf_data data; |
| 75 | struct auxtrace_record *itr; |
| 76 | struct perf_evlist *evlist; |
| 77 | struct perf_session *session; |
| 78 | int realtime_prio; |
| 79 | bool no_buildid; |
| 80 | bool no_buildid_set; |
| 81 | bool no_buildid_cache; |
| 82 | bool no_buildid_cache_set; |
| 83 | bool buildid_all; |
| 84 | bool timestamp_filename; |
| 85 | bool timestamp_boundary; |
| 86 | struct switch_output switch_output; |
| 87 | unsigned long long samples; |
| 88 | cpu_set_t affinity_mask; |
| 89 | }; |
| 90 | |
| 91 | static volatile int auxtrace_record__snapshot_started; |
| 92 | static DEFINE_TRIGGER(auxtrace_snapshot_trigger); |
| 93 | static DEFINE_TRIGGER(switch_output_trigger); |
| 94 | |
| 95 | static const char *affinity_tags[PERF_AFFINITY_MAX] = { |
| 96 | "SYS", "NODE", "CPU" |
| 97 | }; |
| 98 | |
| 99 | static bool switch_output_signal(struct record *rec) |
| 100 | { |
| 101 | return rec->switch_output.signal && |
| 102 | trigger_is_ready(&switch_output_trigger); |
| 103 | } |
| 104 | |
| 105 | static bool switch_output_size(struct record *rec) |
| 106 | { |
| 107 | return rec->switch_output.size && |
| 108 | trigger_is_ready(&switch_output_trigger) && |
| 109 | (rec->bytes_written >= rec->switch_output.size); |
| 110 | } |
| 111 | |
| 112 | static bool switch_output_time(struct record *rec) |
| 113 | { |
| 114 | return rec->switch_output.time && |
| 115 | trigger_is_ready(&switch_output_trigger); |
| 116 | } |
| 117 | |
| 118 | static int record__write(struct record *rec, struct perf_mmap *map __maybe_unused, |
| 119 | void *bf, size_t size) |
| 120 | { |
| 121 | struct perf_data_file *file = &rec->session->data->file; |
| 122 | |
| 123 | if (perf_data_file__write(file, bf, size) < 0) { |
| 124 | pr_err("failed to write perf data, error: %m\n"); |
| 125 | return -1; |
| 126 | } |
| 127 | |
| 128 | rec->bytes_written += size; |
| 129 | |
| 130 | if (switch_output_size(rec)) |
| 131 | trigger_hit(&switch_output_trigger); |
| 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | static int record__aio_enabled(struct record *rec); |
| 137 | static int record__comp_enabled(struct record *rec); |
| 138 | static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size, |
| 139 | void *src, size_t src_size); |
| 140 | |
| 141 | #ifdef HAVE_AIO_SUPPORT |
| 142 | static int record__aio_write(struct aiocb *cblock, int trace_fd, |
| 143 | void *buf, size_t size, off_t off) |
| 144 | { |
| 145 | int rc; |
| 146 | |
| 147 | cblock->aio_fildes = trace_fd; |
| 148 | cblock->aio_buf = buf; |
| 149 | cblock->aio_nbytes = size; |
| 150 | cblock->aio_offset = off; |
| 151 | cblock->aio_sigevent.sigev_notify = SIGEV_NONE; |
| 152 | |
| 153 | do { |
| 154 | rc = aio_write(cblock); |
| 155 | if (rc == 0) { |
| 156 | break; |
| 157 | } else if (errno != EAGAIN) { |
| 158 | cblock->aio_fildes = -1; |
| 159 | pr_err("failed to queue perf data, error: %m\n"); |
| 160 | break; |
| 161 | } |
| 162 | } while (1); |
| 163 | |
| 164 | return rc; |
| 165 | } |
| 166 | |
| 167 | static int record__aio_complete(struct perf_mmap *md, struct aiocb *cblock) |
| 168 | { |
| 169 | void *rem_buf; |
| 170 | off_t rem_off; |
| 171 | size_t rem_size; |
| 172 | int rc, aio_errno; |
| 173 | ssize_t aio_ret, written; |
| 174 | |
| 175 | aio_errno = aio_error(cblock); |
| 176 | if (aio_errno == EINPROGRESS) |
| 177 | return 0; |
| 178 | |
| 179 | written = aio_ret = aio_return(cblock); |
| 180 | if (aio_ret < 0) { |
| 181 | if (aio_errno != EINTR) |
| 182 | pr_err("failed to write perf data, error: %m\n"); |
| 183 | written = 0; |
| 184 | } |
| 185 | |
| 186 | rem_size = cblock->aio_nbytes - written; |
| 187 | |
| 188 | if (rem_size == 0) { |
| 189 | cblock->aio_fildes = -1; |
| 190 | /* |
| 191 | * md->refcount is incremented in record__aio_pushfn() for |
| 192 | * every aio write request started in record__aio_push() so |
| 193 | * decrement it because the request is now complete. |
| 194 | */ |
| 195 | perf_mmap__put(md); |
| 196 | rc = 1; |
| 197 | } else { |
| 198 | /* |
| 199 | * aio write request may require restart with the |
| 200 | * reminder if the kernel didn't write whole |
| 201 | * chunk at once. |
| 202 | */ |
| 203 | rem_off = cblock->aio_offset + written; |
| 204 | rem_buf = (void *)(cblock->aio_buf + written); |
| 205 | record__aio_write(cblock, cblock->aio_fildes, |
| 206 | rem_buf, rem_size, rem_off); |
| 207 | rc = 0; |
| 208 | } |
| 209 | |
| 210 | return rc; |
| 211 | } |
| 212 | |
| 213 | static int record__aio_sync(struct perf_mmap *md, bool sync_all) |
| 214 | { |
| 215 | struct aiocb **aiocb = md->aio.aiocb; |
| 216 | struct aiocb *cblocks = md->aio.cblocks; |
| 217 | struct timespec timeout = { 0, 1000 * 1000 * 1 }; /* 1ms */ |
| 218 | int i, do_suspend; |
| 219 | |
| 220 | do { |
| 221 | do_suspend = 0; |
| 222 | for (i = 0; i < md->aio.nr_cblocks; ++i) { |
| 223 | if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) { |
| 224 | if (sync_all) |
| 225 | aiocb[i] = NULL; |
| 226 | else |
| 227 | return i; |
| 228 | } else { |
| 229 | /* |
| 230 | * Started aio write is not complete yet |
| 231 | * so it has to be waited before the |
| 232 | * next allocation. |
| 233 | */ |
| 234 | aiocb[i] = &cblocks[i]; |
| 235 | do_suspend = 1; |
| 236 | } |
| 237 | } |
| 238 | if (!do_suspend) |
| 239 | return -1; |
| 240 | |
| 241 | while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) { |
| 242 | if (!(errno == EAGAIN || errno == EINTR)) |
| 243 | pr_err("failed to sync perf data, error: %m\n"); |
| 244 | } |
| 245 | } while (1); |
| 246 | } |
| 247 | |
| 248 | struct record_aio { |
| 249 | struct record *rec; |
| 250 | void *data; |
| 251 | size_t size; |
| 252 | }; |
| 253 | |
| 254 | static int record__aio_pushfn(struct perf_mmap *map, void *to, void *buf, size_t size) |
| 255 | { |
| 256 | struct record_aio *aio = to; |
| 257 | |
| 258 | /* |
| 259 | * map->base data pointed by buf is copied into free map->aio.data[] buffer |
| 260 | * to release space in the kernel buffer as fast as possible, calling |
| 261 | * perf_mmap__consume() from perf_mmap__push() function. |
| 262 | * |
| 263 | * That lets the kernel to proceed with storing more profiling data into |
| 264 | * the kernel buffer earlier than other per-cpu kernel buffers are handled. |
| 265 | * |
| 266 | * Coping can be done in two steps in case the chunk of profiling data |
| 267 | * crosses the upper bound of the kernel buffer. In this case we first move |
| 268 | * part of data from map->start till the upper bound and then the reminder |
| 269 | * from the beginning of the kernel buffer till the end of the data chunk. |
| 270 | */ |
| 271 | |
| 272 | if (record__comp_enabled(aio->rec)) { |
| 273 | size = zstd_compress(aio->rec->session, aio->data + aio->size, |
| 274 | perf_mmap__mmap_len(map) - aio->size, |
| 275 | buf, size); |
| 276 | } else { |
| 277 | memcpy(aio->data + aio->size, buf, size); |
| 278 | } |
| 279 | |
| 280 | if (!aio->size) { |
| 281 | /* |
| 282 | * Increment map->refcount to guard map->aio.data[] buffer |
| 283 | * from premature deallocation because map object can be |
| 284 | * released earlier than aio write request started on |
| 285 | * map->aio.data[] buffer is complete. |
| 286 | * |
| 287 | * perf_mmap__put() is done at record__aio_complete() |
| 288 | * after started aio request completion or at record__aio_push() |
| 289 | * if the request failed to start. |
| 290 | */ |
| 291 | perf_mmap__get(map); |
| 292 | } |
| 293 | |
| 294 | aio->size += size; |
| 295 | |
| 296 | return size; |
| 297 | } |
| 298 | |
| 299 | static int record__aio_push(struct record *rec, struct perf_mmap *map, off_t *off) |
| 300 | { |
| 301 | int ret, idx; |
| 302 | int trace_fd = rec->session->data->file.fd; |
| 303 | struct record_aio aio = { .rec = rec, .size = 0 }; |
| 304 | |
| 305 | /* |
| 306 | * Call record__aio_sync() to wait till map->aio.data[] buffer |
| 307 | * becomes available after previous aio write operation. |
| 308 | */ |
| 309 | |
| 310 | idx = record__aio_sync(map, false); |
| 311 | aio.data = map->aio.data[idx]; |
| 312 | ret = perf_mmap__push(map, &aio, record__aio_pushfn); |
| 313 | if (ret != 0) /* ret > 0 - no data, ret < 0 - error */ |
| 314 | return ret; |
| 315 | |
| 316 | rec->samples++; |
| 317 | ret = record__aio_write(&(map->aio.cblocks[idx]), trace_fd, aio.data, aio.size, *off); |
| 318 | if (!ret) { |
| 319 | *off += aio.size; |
| 320 | rec->bytes_written += aio.size; |
| 321 | if (switch_output_size(rec)) |
| 322 | trigger_hit(&switch_output_trigger); |
| 323 | } else { |
| 324 | /* |
| 325 | * Decrement map->refcount incremented in record__aio_pushfn() |
| 326 | * back if record__aio_write() operation failed to start, otherwise |
| 327 | * map->refcount is decremented in record__aio_complete() after |
| 328 | * aio write operation finishes successfully. |
| 329 | */ |
| 330 | perf_mmap__put(map); |
| 331 | } |
| 332 | |
| 333 | return ret; |
| 334 | } |
| 335 | |
| 336 | static off_t record__aio_get_pos(int trace_fd) |
| 337 | { |
| 338 | return lseek(trace_fd, 0, SEEK_CUR); |
| 339 | } |
| 340 | |
| 341 | static void record__aio_set_pos(int trace_fd, off_t pos) |
| 342 | { |
| 343 | lseek(trace_fd, pos, SEEK_SET); |
| 344 | } |
| 345 | |
| 346 | static void record__aio_mmap_read_sync(struct record *rec) |
| 347 | { |
| 348 | int i; |
| 349 | struct perf_evlist *evlist = rec->evlist; |
| 350 | struct perf_mmap *maps = evlist->mmap; |
| 351 | |
| 352 | if (!record__aio_enabled(rec)) |
| 353 | return; |
| 354 | |
| 355 | for (i = 0; i < evlist->nr_mmaps; i++) { |
| 356 | struct perf_mmap *map = &maps[i]; |
| 357 | |
| 358 | if (map->base) |
| 359 | record__aio_sync(map, true); |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | static int nr_cblocks_default = 1; |
| 364 | static int nr_cblocks_max = 4; |
| 365 | |
| 366 | static int record__aio_parse(const struct option *opt, |
| 367 | const char *str, |
| 368 | int unset) |
| 369 | { |
| 370 | struct record_opts *opts = (struct record_opts *)opt->value; |
| 371 | |
| 372 | if (unset) { |
| 373 | opts->nr_cblocks = 0; |
| 374 | } else { |
| 375 | if (str) |
| 376 | opts->nr_cblocks = strtol(str, NULL, 0); |
| 377 | if (!opts->nr_cblocks) |
| 378 | opts->nr_cblocks = nr_cblocks_default; |
| 379 | } |
| 380 | |
| 381 | return 0; |
| 382 | } |
| 383 | #else /* HAVE_AIO_SUPPORT */ |
| 384 | static int nr_cblocks_max = 0; |
| 385 | |
| 386 | static int record__aio_push(struct record *rec __maybe_unused, struct perf_mmap *map __maybe_unused, |
| 387 | off_t *off __maybe_unused) |
| 388 | { |
| 389 | return -1; |
| 390 | } |
| 391 | |
| 392 | static off_t record__aio_get_pos(int trace_fd __maybe_unused) |
| 393 | { |
| 394 | return -1; |
| 395 | } |
| 396 | |
| 397 | static void record__aio_set_pos(int trace_fd __maybe_unused, off_t pos __maybe_unused) |
| 398 | { |
| 399 | } |
| 400 | |
| 401 | static void record__aio_mmap_read_sync(struct record *rec __maybe_unused) |
| 402 | { |
| 403 | } |
| 404 | #endif |
| 405 | |
| 406 | static int record__aio_enabled(struct record *rec) |
| 407 | { |
| 408 | return rec->opts.nr_cblocks > 0; |
| 409 | } |
| 410 | |
| 411 | #define MMAP_FLUSH_DEFAULT 1 |
| 412 | static int record__mmap_flush_parse(const struct option *opt, |
| 413 | const char *str, |
| 414 | int unset) |
| 415 | { |
| 416 | int flush_max; |
| 417 | struct record_opts *opts = (struct record_opts *)opt->value; |
| 418 | static struct parse_tag tags[] = { |
| 419 | { .tag = 'B', .mult = 1 }, |
| 420 | { .tag = 'K', .mult = 1 << 10 }, |
| 421 | { .tag = 'M', .mult = 1 << 20 }, |
| 422 | { .tag = 'G', .mult = 1 << 30 }, |
| 423 | { .tag = 0 }, |
| 424 | }; |
| 425 | |
| 426 | if (unset) |
| 427 | return 0; |
| 428 | |
| 429 | if (str) { |
| 430 | opts->mmap_flush = parse_tag_value(str, tags); |
| 431 | if (opts->mmap_flush == (int)-1) |
| 432 | opts->mmap_flush = strtol(str, NULL, 0); |
| 433 | } |
| 434 | |
| 435 | if (!opts->mmap_flush) |
| 436 | opts->mmap_flush = MMAP_FLUSH_DEFAULT; |
| 437 | |
| 438 | flush_max = perf_evlist__mmap_size(opts->mmap_pages); |
| 439 | flush_max /= 4; |
| 440 | if (opts->mmap_flush > flush_max) |
| 441 | opts->mmap_flush = flush_max; |
| 442 | |
| 443 | return 0; |
| 444 | } |
| 445 | |
| 446 | #ifdef HAVE_ZSTD_SUPPORT |
| 447 | static unsigned int comp_level_default = 1; |
| 448 | |
| 449 | static int record__parse_comp_level(const struct option *opt, const char *str, int unset) |
| 450 | { |
| 451 | struct record_opts *opts = opt->value; |
| 452 | |
| 453 | if (unset) { |
| 454 | opts->comp_level = 0; |
| 455 | } else { |
| 456 | if (str) |
| 457 | opts->comp_level = strtol(str, NULL, 0); |
| 458 | if (!opts->comp_level) |
| 459 | opts->comp_level = comp_level_default; |
| 460 | } |
| 461 | |
| 462 | return 0; |
| 463 | } |
| 464 | #endif |
| 465 | static unsigned int comp_level_max = 22; |
| 466 | |
| 467 | static int record__comp_enabled(struct record *rec) |
| 468 | { |
| 469 | return rec->opts.comp_level > 0; |
| 470 | } |
| 471 | |
| 472 | static int process_synthesized_event(struct perf_tool *tool, |
| 473 | union perf_event *event, |
| 474 | struct perf_sample *sample __maybe_unused, |
| 475 | struct machine *machine __maybe_unused) |
| 476 | { |
| 477 | struct record *rec = container_of(tool, struct record, tool); |
| 478 | return record__write(rec, NULL, event, event->header.size); |
| 479 | } |
| 480 | |
| 481 | static int record__pushfn(struct perf_mmap *map, void *to, void *bf, size_t size) |
| 482 | { |
| 483 | struct record *rec = to; |
| 484 | |
| 485 | if (record__comp_enabled(rec)) { |
| 486 | size = zstd_compress(rec->session, map->data, perf_mmap__mmap_len(map), bf, size); |
| 487 | bf = map->data; |
| 488 | } |
| 489 | |
| 490 | rec->samples++; |
| 491 | return record__write(rec, map, bf, size); |
| 492 | } |
| 493 | |
| 494 | static volatile int done; |
| 495 | static volatile int signr = -1; |
| 496 | static volatile int child_finished; |
| 497 | |
| 498 | static void sig_handler(int sig) |
| 499 | { |
| 500 | if (sig == SIGCHLD) |
| 501 | child_finished = 1; |
| 502 | else |
| 503 | signr = sig; |
| 504 | |
| 505 | done = 1; |
| 506 | } |
| 507 | |
| 508 | static void sigsegv_handler(int sig) |
| 509 | { |
| 510 | perf_hooks__recover(); |
| 511 | sighandler_dump_stack(sig); |
| 512 | } |
| 513 | |
| 514 | static void record__sig_exit(void) |
| 515 | { |
| 516 | if (signr == -1) |
| 517 | return; |
| 518 | |
| 519 | signal(signr, SIG_DFL); |
| 520 | raise(signr); |
| 521 | } |
| 522 | |
| 523 | #ifdef HAVE_AUXTRACE_SUPPORT |
| 524 | |
| 525 | static int record__process_auxtrace(struct perf_tool *tool, |
| 526 | struct perf_mmap *map, |
| 527 | union perf_event *event, void *data1, |
| 528 | size_t len1, void *data2, size_t len2) |
| 529 | { |
| 530 | struct record *rec = container_of(tool, struct record, tool); |
| 531 | struct perf_data *data = &rec->data; |
| 532 | size_t padding; |
| 533 | u8 pad[8] = {0}; |
| 534 | |
| 535 | if (!perf_data__is_pipe(data) && !perf_data__is_dir(data)) { |
| 536 | off_t file_offset; |
| 537 | int fd = perf_data__fd(data); |
| 538 | int err; |
| 539 | |
| 540 | file_offset = lseek(fd, 0, SEEK_CUR); |
| 541 | if (file_offset == -1) |
| 542 | return -1; |
| 543 | err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index, |
| 544 | event, file_offset); |
| 545 | if (err) |
| 546 | return err; |
| 547 | } |
| 548 | |
| 549 | /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */ |
| 550 | padding = (len1 + len2) & 7; |
| 551 | if (padding) |
| 552 | padding = 8 - padding; |
| 553 | |
| 554 | record__write(rec, map, event, event->header.size); |
| 555 | record__write(rec, map, data1, len1); |
| 556 | if (len2) |
| 557 | record__write(rec, map, data2, len2); |
| 558 | record__write(rec, map, &pad, padding); |
| 559 | |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | static int record__auxtrace_mmap_read(struct record *rec, |
| 564 | struct perf_mmap *map) |
| 565 | { |
| 566 | int ret; |
| 567 | |
| 568 | ret = auxtrace_mmap__read(map, rec->itr, &rec->tool, |
| 569 | record__process_auxtrace); |
| 570 | if (ret < 0) |
| 571 | return ret; |
| 572 | |
| 573 | if (ret) |
| 574 | rec->samples++; |
| 575 | |
| 576 | return 0; |
| 577 | } |
| 578 | |
| 579 | static int record__auxtrace_mmap_read_snapshot(struct record *rec, |
| 580 | struct perf_mmap *map) |
| 581 | { |
| 582 | int ret; |
| 583 | |
| 584 | ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool, |
| 585 | record__process_auxtrace, |
| 586 | rec->opts.auxtrace_snapshot_size); |
| 587 | if (ret < 0) |
| 588 | return ret; |
| 589 | |
| 590 | if (ret) |
| 591 | rec->samples++; |
| 592 | |
| 593 | return 0; |
| 594 | } |
| 595 | |
| 596 | static int record__auxtrace_read_snapshot_all(struct record *rec) |
| 597 | { |
| 598 | int i; |
| 599 | int rc = 0; |
| 600 | |
| 601 | for (i = 0; i < rec->evlist->nr_mmaps; i++) { |
| 602 | struct perf_mmap *map = &rec->evlist->mmap[i]; |
| 603 | |
| 604 | if (!map->auxtrace_mmap.base) |
| 605 | continue; |
| 606 | |
| 607 | if (record__auxtrace_mmap_read_snapshot(rec, map) != 0) { |
| 608 | rc = -1; |
| 609 | goto out; |
| 610 | } |
| 611 | } |
| 612 | out: |
| 613 | return rc; |
| 614 | } |
| 615 | |
| 616 | static void record__read_auxtrace_snapshot(struct record *rec) |
| 617 | { |
| 618 | pr_debug("Recording AUX area tracing snapshot\n"); |
| 619 | if (record__auxtrace_read_snapshot_all(rec) < 0) { |
| 620 | trigger_error(&auxtrace_snapshot_trigger); |
| 621 | } else { |
| 622 | if (auxtrace_record__snapshot_finish(rec->itr)) |
| 623 | trigger_error(&auxtrace_snapshot_trigger); |
| 624 | else |
| 625 | trigger_ready(&auxtrace_snapshot_trigger); |
| 626 | } |
| 627 | } |
| 628 | |
| 629 | static int record__auxtrace_init(struct record *rec) |
| 630 | { |
| 631 | int err; |
| 632 | |
| 633 | if (!rec->itr) { |
| 634 | rec->itr = auxtrace_record__init(rec->evlist, &err); |
| 635 | if (err) |
| 636 | return err; |
| 637 | } |
| 638 | |
| 639 | err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts, |
| 640 | rec->opts.auxtrace_snapshot_opts); |
| 641 | if (err) |
| 642 | return err; |
| 643 | |
| 644 | return auxtrace_parse_filters(rec->evlist); |
| 645 | } |
| 646 | |
| 647 | #else |
| 648 | |
| 649 | static inline |
| 650 | int record__auxtrace_mmap_read(struct record *rec __maybe_unused, |
| 651 | struct perf_mmap *map __maybe_unused) |
| 652 | { |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | static inline |
| 657 | void record__read_auxtrace_snapshot(struct record *rec __maybe_unused) |
| 658 | { |
| 659 | } |
| 660 | |
| 661 | static inline |
| 662 | int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused) |
| 663 | { |
| 664 | return 0; |
| 665 | } |
| 666 | |
| 667 | static int record__auxtrace_init(struct record *rec __maybe_unused) |
| 668 | { |
| 669 | return 0; |
| 670 | } |
| 671 | |
| 672 | #endif |
| 673 | |
| 674 | static int record__mmap_evlist(struct record *rec, |
| 675 | struct perf_evlist *evlist) |
| 676 | { |
| 677 | struct record_opts *opts = &rec->opts; |
| 678 | char msg[512]; |
| 679 | |
| 680 | if (opts->affinity != PERF_AFFINITY_SYS) |
| 681 | cpu__setup_cpunode_map(); |
| 682 | |
| 683 | if (perf_evlist__mmap_ex(evlist, opts->mmap_pages, |
| 684 | opts->auxtrace_mmap_pages, |
| 685 | opts->auxtrace_snapshot_mode, |
| 686 | opts->nr_cblocks, opts->affinity, |
| 687 | opts->mmap_flush, opts->comp_level) < 0) { |
| 688 | if (errno == EPERM) { |
| 689 | pr_err("Permission error mapping pages.\n" |
| 690 | "Consider increasing " |
| 691 | "/proc/sys/kernel/perf_event_mlock_kb,\n" |
| 692 | "or try again with a smaller value of -m/--mmap_pages.\n" |
| 693 | "(current value: %u,%u)\n", |
| 694 | opts->mmap_pages, opts->auxtrace_mmap_pages); |
| 695 | return -errno; |
| 696 | } else { |
| 697 | pr_err("failed to mmap with %d (%s)\n", errno, |
| 698 | str_error_r(errno, msg, sizeof(msg))); |
| 699 | if (errno) |
| 700 | return -errno; |
| 701 | else |
| 702 | return -EINVAL; |
| 703 | } |
| 704 | } |
| 705 | return 0; |
| 706 | } |
| 707 | |
| 708 | static int record__mmap(struct record *rec) |
| 709 | { |
| 710 | return record__mmap_evlist(rec, rec->evlist); |
| 711 | } |
| 712 | |
| 713 | static int record__open(struct record *rec) |
| 714 | { |
| 715 | char msg[BUFSIZ]; |
| 716 | struct perf_evsel *pos; |
| 717 | struct perf_evlist *evlist = rec->evlist; |
| 718 | struct perf_session *session = rec->session; |
| 719 | struct record_opts *opts = &rec->opts; |
| 720 | int rc = 0; |
| 721 | |
| 722 | /* |
| 723 | * For initial_delay we need to add a dummy event so that we can track |
| 724 | * PERF_RECORD_MMAP while we wait for the initial delay to enable the |
| 725 | * real events, the ones asked by the user. |
| 726 | */ |
| 727 | if (opts->initial_delay) { |
| 728 | if (perf_evlist__add_dummy(evlist)) |
| 729 | return -ENOMEM; |
| 730 | |
| 731 | pos = perf_evlist__first(evlist); |
| 732 | pos->tracking = 0; |
| 733 | pos = perf_evlist__last(evlist); |
| 734 | pos->tracking = 1; |
| 735 | pos->attr.enable_on_exec = 1; |
| 736 | } |
| 737 | |
| 738 | perf_evlist__config(evlist, opts, &callchain_param); |
| 739 | |
| 740 | evlist__for_each_entry(evlist, pos) { |
| 741 | try_again: |
| 742 | if (perf_evsel__open(pos, pos->cpus, pos->threads) < 0) { |
| 743 | if (perf_evsel__fallback(pos, errno, msg, sizeof(msg))) { |
| 744 | if (verbose > 0) |
| 745 | ui__warning("%s\n", msg); |
| 746 | goto try_again; |
| 747 | } |
| 748 | if ((errno == EINVAL || errno == EBADF) && |
| 749 | pos->leader != pos && |
| 750 | pos->weak_group) { |
| 751 | pos = perf_evlist__reset_weak_group(evlist, pos); |
| 752 | goto try_again; |
| 753 | } |
| 754 | rc = -errno; |
| 755 | perf_evsel__open_strerror(pos, &opts->target, |
| 756 | errno, msg, sizeof(msg)); |
| 757 | ui__error("%s\n", msg); |
| 758 | goto out; |
| 759 | } |
| 760 | |
| 761 | pos->supported = true; |
| 762 | } |
| 763 | |
| 764 | if (perf_evlist__apply_filters(evlist, &pos)) { |
| 765 | pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n", |
| 766 | pos->filter, perf_evsel__name(pos), errno, |
| 767 | str_error_r(errno, msg, sizeof(msg))); |
| 768 | rc = -1; |
| 769 | goto out; |
| 770 | } |
| 771 | |
| 772 | rc = record__mmap(rec); |
| 773 | if (rc) |
| 774 | goto out; |
| 775 | |
| 776 | session->evlist = evlist; |
| 777 | perf_session__set_id_hdr_size(session); |
| 778 | out: |
| 779 | return rc; |
| 780 | } |
| 781 | |
| 782 | static int process_sample_event(struct perf_tool *tool, |
| 783 | union perf_event *event, |
| 784 | struct perf_sample *sample, |
| 785 | struct perf_evsel *evsel, |
| 786 | struct machine *machine) |
| 787 | { |
| 788 | struct record *rec = container_of(tool, struct record, tool); |
| 789 | |
| 790 | if (rec->evlist->first_sample_time == 0) |
| 791 | rec->evlist->first_sample_time = sample->time; |
| 792 | |
| 793 | rec->evlist->last_sample_time = sample->time; |
| 794 | |
| 795 | if (rec->buildid_all) |
| 796 | return 0; |
| 797 | |
| 798 | rec->samples++; |
| 799 | return build_id__mark_dso_hit(tool, event, sample, evsel, machine); |
| 800 | } |
| 801 | |
| 802 | static int process_buildids(struct record *rec) |
| 803 | { |
| 804 | struct perf_session *session = rec->session; |
| 805 | |
| 806 | if (perf_data__size(&rec->data) == 0) |
| 807 | return 0; |
| 808 | |
| 809 | /* |
| 810 | * During this process, it'll load kernel map and replace the |
| 811 | * dso->long_name to a real pathname it found. In this case |
| 812 | * we prefer the vmlinux path like |
| 813 | * /lib/modules/3.16.4/build/vmlinux |
| 814 | * |
| 815 | * rather than build-id path (in debug directory). |
| 816 | * $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551 |
| 817 | */ |
| 818 | symbol_conf.ignore_vmlinux_buildid = true; |
| 819 | |
| 820 | /* |
| 821 | * If --buildid-all is given, it marks all DSO regardless of hits, |
| 822 | * so no need to process samples. But if timestamp_boundary is enabled, |
| 823 | * it still needs to walk on all samples to get the timestamps of |
| 824 | * first/last samples. |
| 825 | */ |
| 826 | if (rec->buildid_all && !rec->timestamp_boundary) |
| 827 | rec->tool.sample = NULL; |
| 828 | |
| 829 | return perf_session__process_events(session); |
| 830 | } |
| 831 | |
| 832 | static void perf_event__synthesize_guest_os(struct machine *machine, void *data) |
| 833 | { |
| 834 | int err; |
| 835 | struct perf_tool *tool = data; |
| 836 | /* |
| 837 | *As for guest kernel when processing subcommand record&report, |
| 838 | *we arrange module mmap prior to guest kernel mmap and trigger |
| 839 | *a preload dso because default guest module symbols are loaded |
| 840 | *from guest kallsyms instead of /lib/modules/XXX/XXX. This |
| 841 | *method is used to avoid symbol missing when the first addr is |
| 842 | *in module instead of in guest kernel. |
| 843 | */ |
| 844 | err = perf_event__synthesize_modules(tool, process_synthesized_event, |
| 845 | machine); |
| 846 | if (err < 0) |
| 847 | pr_err("Couldn't record guest kernel [%d]'s reference" |
| 848 | " relocation symbol.\n", machine->pid); |
| 849 | |
| 850 | /* |
| 851 | * We use _stext for guest kernel because guest kernel's /proc/kallsyms |
| 852 | * have no _text sometimes. |
| 853 | */ |
| 854 | err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event, |
| 855 | machine); |
| 856 | if (err < 0) |
| 857 | pr_err("Couldn't record guest kernel [%d]'s reference" |
| 858 | " relocation symbol.\n", machine->pid); |
| 859 | } |
| 860 | |
| 861 | static struct perf_event_header finished_round_event = { |
| 862 | .size = sizeof(struct perf_event_header), |
| 863 | .type = PERF_RECORD_FINISHED_ROUND, |
| 864 | }; |
| 865 | |
| 866 | static void record__adjust_affinity(struct record *rec, struct perf_mmap *map) |
| 867 | { |
| 868 | if (rec->opts.affinity != PERF_AFFINITY_SYS && |
| 869 | !CPU_EQUAL(&rec->affinity_mask, &map->affinity_mask)) { |
| 870 | CPU_ZERO(&rec->affinity_mask); |
| 871 | CPU_OR(&rec->affinity_mask, &rec->affinity_mask, &map->affinity_mask); |
| 872 | sched_setaffinity(0, sizeof(rec->affinity_mask), &rec->affinity_mask); |
| 873 | } |
| 874 | } |
| 875 | |
| 876 | static size_t process_comp_header(void *record, size_t increment) |
| 877 | { |
| 878 | struct compressed_event *event = record; |
| 879 | size_t size = sizeof(*event); |
| 880 | |
| 881 | if (increment) { |
| 882 | event->header.size += increment; |
| 883 | return increment; |
| 884 | } |
| 885 | |
| 886 | event->header.type = PERF_RECORD_COMPRESSED; |
| 887 | event->header.size = size; |
| 888 | |
| 889 | return size; |
| 890 | } |
| 891 | |
| 892 | static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size, |
| 893 | void *src, size_t src_size) |
| 894 | { |
| 895 | size_t compressed; |
| 896 | size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct compressed_event) - 1; |
| 897 | |
| 898 | compressed = zstd_compress_stream_to_records(&session->zstd_data, dst, dst_size, src, src_size, |
| 899 | max_record_size, process_comp_header); |
| 900 | |
| 901 | session->bytes_transferred += src_size; |
| 902 | session->bytes_compressed += compressed; |
| 903 | |
| 904 | return compressed; |
| 905 | } |
| 906 | |
| 907 | static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evlist, |
| 908 | bool overwrite, bool synch) |
| 909 | { |
| 910 | u64 bytes_written = rec->bytes_written; |
| 911 | int i; |
| 912 | int rc = 0; |
| 913 | struct perf_mmap *maps; |
| 914 | int trace_fd = rec->data.file.fd; |
| 915 | off_t off = 0; |
| 916 | |
| 917 | if (!evlist) |
| 918 | return 0; |
| 919 | |
| 920 | maps = overwrite ? evlist->overwrite_mmap : evlist->mmap; |
| 921 | if (!maps) |
| 922 | return 0; |
| 923 | |
| 924 | if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING) |
| 925 | return 0; |
| 926 | |
| 927 | if (record__aio_enabled(rec)) |
| 928 | off = record__aio_get_pos(trace_fd); |
| 929 | |
| 930 | for (i = 0; i < evlist->nr_mmaps; i++) { |
| 931 | u64 flush = 0; |
| 932 | struct perf_mmap *map = &maps[i]; |
| 933 | |
| 934 | if (map->base) { |
| 935 | record__adjust_affinity(rec, map); |
| 936 | if (synch) { |
| 937 | flush = map->flush; |
| 938 | map->flush = 1; |
| 939 | } |
| 940 | if (!record__aio_enabled(rec)) { |
| 941 | if (perf_mmap__push(map, rec, record__pushfn) < 0) { |
| 942 | if (synch) |
| 943 | map->flush = flush; |
| 944 | rc = -1; |
| 945 | goto out; |
| 946 | } |
| 947 | } else { |
| 948 | if (record__aio_push(rec, map, &off) < 0) { |
| 949 | record__aio_set_pos(trace_fd, off); |
| 950 | if (synch) |
| 951 | map->flush = flush; |
| 952 | rc = -1; |
| 953 | goto out; |
| 954 | } |
| 955 | } |
| 956 | if (synch) |
| 957 | map->flush = flush; |
| 958 | } |
| 959 | |
| 960 | if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode && |
| 961 | record__auxtrace_mmap_read(rec, map) != 0) { |
| 962 | rc = -1; |
| 963 | goto out; |
| 964 | } |
| 965 | } |
| 966 | |
| 967 | if (record__aio_enabled(rec)) |
| 968 | record__aio_set_pos(trace_fd, off); |
| 969 | |
| 970 | /* |
| 971 | * Mark the round finished in case we wrote |
| 972 | * at least one event. |
| 973 | */ |
| 974 | if (bytes_written != rec->bytes_written) |
| 975 | rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event)); |
| 976 | |
| 977 | if (overwrite) |
| 978 | perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY); |
| 979 | out: |
| 980 | return rc; |
| 981 | } |
| 982 | |
| 983 | static int record__mmap_read_all(struct record *rec, bool synch) |
| 984 | { |
| 985 | int err; |
| 986 | |
| 987 | err = record__mmap_read_evlist(rec, rec->evlist, false, synch); |
| 988 | if (err) |
| 989 | return err; |
| 990 | |
| 991 | return record__mmap_read_evlist(rec, rec->evlist, true, synch); |
| 992 | } |
| 993 | |
| 994 | static void record__init_features(struct record *rec) |
| 995 | { |
| 996 | struct perf_session *session = rec->session; |
| 997 | int feat; |
| 998 | |
| 999 | for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++) |
| 1000 | perf_header__set_feat(&session->header, feat); |
| 1001 | |
| 1002 | if (rec->no_buildid) |
| 1003 | perf_header__clear_feat(&session->header, HEADER_BUILD_ID); |
| 1004 | |
| 1005 | if (!have_tracepoints(&rec->evlist->entries)) |
| 1006 | perf_header__clear_feat(&session->header, HEADER_TRACING_DATA); |
| 1007 | |
| 1008 | if (!rec->opts.branch_stack) |
| 1009 | perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK); |
| 1010 | |
| 1011 | if (!rec->opts.full_auxtrace) |
| 1012 | perf_header__clear_feat(&session->header, HEADER_AUXTRACE); |
| 1013 | |
| 1014 | if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns)) |
| 1015 | perf_header__clear_feat(&session->header, HEADER_CLOCKID); |
| 1016 | |
| 1017 | perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT); |
| 1018 | if (!record__comp_enabled(rec)) |
| 1019 | perf_header__clear_feat(&session->header, HEADER_COMPRESSED); |
| 1020 | |
| 1021 | perf_header__clear_feat(&session->header, HEADER_STAT); |
| 1022 | } |
| 1023 | |
| 1024 | static void |
| 1025 | record__finish_output(struct record *rec) |
| 1026 | { |
| 1027 | struct perf_data *data = &rec->data; |
| 1028 | int fd = perf_data__fd(data); |
| 1029 | |
| 1030 | if (data->is_pipe) |
| 1031 | return; |
| 1032 | |
| 1033 | rec->session->header.data_size += rec->bytes_written; |
| 1034 | data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR); |
| 1035 | |
| 1036 | if (!rec->no_buildid) { |
| 1037 | process_buildids(rec); |
| 1038 | |
| 1039 | if (rec->buildid_all) |
| 1040 | dsos__hit_all(rec->session); |
| 1041 | } |
| 1042 | perf_session__write_header(rec->session, rec->evlist, fd, true); |
| 1043 | |
| 1044 | return; |
| 1045 | } |
| 1046 | |
| 1047 | static int record__synthesize_workload(struct record *rec, bool tail) |
| 1048 | { |
| 1049 | int err; |
| 1050 | struct thread_map *thread_map; |
| 1051 | |
| 1052 | if (rec->opts.tail_synthesize != tail) |
| 1053 | return 0; |
| 1054 | |
| 1055 | thread_map = thread_map__new_by_tid(rec->evlist->workload.pid); |
| 1056 | if (thread_map == NULL) |
| 1057 | return -1; |
| 1058 | |
| 1059 | err = perf_event__synthesize_thread_map(&rec->tool, thread_map, |
| 1060 | process_synthesized_event, |
| 1061 | &rec->session->machines.host, |
| 1062 | rec->opts.sample_address); |
| 1063 | thread_map__put(thread_map); |
| 1064 | return err; |
| 1065 | } |
| 1066 | |
| 1067 | static int record__synthesize(struct record *rec, bool tail); |
| 1068 | |
| 1069 | static int |
| 1070 | record__switch_output(struct record *rec, bool at_exit) |
| 1071 | { |
| 1072 | struct perf_data *data = &rec->data; |
| 1073 | int fd, err; |
| 1074 | char *new_filename; |
| 1075 | |
| 1076 | /* Same Size: "2015122520103046"*/ |
| 1077 | char timestamp[] = "InvalidTimestamp"; |
| 1078 | |
| 1079 | record__aio_mmap_read_sync(rec); |
| 1080 | |
| 1081 | record__synthesize(rec, true); |
| 1082 | if (target__none(&rec->opts.target)) |
| 1083 | record__synthesize_workload(rec, true); |
| 1084 | |
| 1085 | rec->samples = 0; |
| 1086 | record__finish_output(rec); |
| 1087 | err = fetch_current_timestamp(timestamp, sizeof(timestamp)); |
| 1088 | if (err) { |
| 1089 | pr_err("Failed to get current timestamp\n"); |
| 1090 | return -EINVAL; |
| 1091 | } |
| 1092 | |
| 1093 | fd = perf_data__switch(data, timestamp, |
| 1094 | rec->session->header.data_offset, |
| 1095 | at_exit, &new_filename); |
| 1096 | if (fd >= 0 && !at_exit) { |
| 1097 | rec->bytes_written = 0; |
| 1098 | rec->session->header.data_size = 0; |
| 1099 | } |
| 1100 | |
| 1101 | if (!quiet) |
| 1102 | fprintf(stderr, "[ perf record: Dump %s.%s ]\n", |
| 1103 | data->path, timestamp); |
| 1104 | |
| 1105 | if (rec->switch_output.num_files) { |
| 1106 | int n = rec->switch_output.cur_file + 1; |
| 1107 | |
| 1108 | if (n >= rec->switch_output.num_files) |
| 1109 | n = 0; |
| 1110 | rec->switch_output.cur_file = n; |
| 1111 | if (rec->switch_output.filenames[n]) { |
| 1112 | remove(rec->switch_output.filenames[n]); |
| 1113 | free(rec->switch_output.filenames[n]); |
| 1114 | } |
| 1115 | rec->switch_output.filenames[n] = new_filename; |
| 1116 | } else { |
| 1117 | free(new_filename); |
| 1118 | } |
| 1119 | |
| 1120 | /* Output tracking events */ |
| 1121 | if (!at_exit) { |
| 1122 | record__synthesize(rec, false); |
| 1123 | |
| 1124 | /* |
| 1125 | * In 'perf record --switch-output' without -a, |
| 1126 | * record__synthesize() in record__switch_output() won't |
| 1127 | * generate tracking events because there's no thread_map |
| 1128 | * in evlist. Which causes newly created perf.data doesn't |
| 1129 | * contain map and comm information. |
| 1130 | * Create a fake thread_map and directly call |
| 1131 | * perf_event__synthesize_thread_map() for those events. |
| 1132 | */ |
| 1133 | if (target__none(&rec->opts.target)) |
| 1134 | record__synthesize_workload(rec, false); |
| 1135 | } |
| 1136 | return fd; |
| 1137 | } |
| 1138 | |
| 1139 | static volatile int workload_exec_errno; |
| 1140 | |
| 1141 | /* |
| 1142 | * perf_evlist__prepare_workload will send a SIGUSR1 |
| 1143 | * if the fork fails, since we asked by setting its |
| 1144 | * want_signal to true. |
| 1145 | */ |
| 1146 | static void workload_exec_failed_signal(int signo __maybe_unused, |
| 1147 | siginfo_t *info, |
| 1148 | void *ucontext __maybe_unused) |
| 1149 | { |
| 1150 | workload_exec_errno = info->si_value.sival_int; |
| 1151 | done = 1; |
| 1152 | child_finished = 1; |
| 1153 | } |
| 1154 | |
| 1155 | static void snapshot_sig_handler(int sig); |
| 1156 | static void alarm_sig_handler(int sig); |
| 1157 | |
| 1158 | int __weak |
| 1159 | perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused, |
| 1160 | struct perf_tool *tool __maybe_unused, |
| 1161 | perf_event__handler_t process __maybe_unused, |
| 1162 | struct machine *machine __maybe_unused) |
| 1163 | { |
| 1164 | return 0; |
| 1165 | } |
| 1166 | |
| 1167 | static const struct perf_event_mmap_page * |
| 1168 | perf_evlist__pick_pc(struct perf_evlist *evlist) |
| 1169 | { |
| 1170 | if (evlist) { |
| 1171 | if (evlist->mmap && evlist->mmap[0].base) |
| 1172 | return evlist->mmap[0].base; |
| 1173 | if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].base) |
| 1174 | return evlist->overwrite_mmap[0].base; |
| 1175 | } |
| 1176 | return NULL; |
| 1177 | } |
| 1178 | |
| 1179 | static const struct perf_event_mmap_page *record__pick_pc(struct record *rec) |
| 1180 | { |
| 1181 | const struct perf_event_mmap_page *pc; |
| 1182 | |
| 1183 | pc = perf_evlist__pick_pc(rec->evlist); |
| 1184 | if (pc) |
| 1185 | return pc; |
| 1186 | return NULL; |
| 1187 | } |
| 1188 | |
| 1189 | static int record__synthesize(struct record *rec, bool tail) |
| 1190 | { |
| 1191 | struct perf_session *session = rec->session; |
| 1192 | struct machine *machine = &session->machines.host; |
| 1193 | struct perf_data *data = &rec->data; |
| 1194 | struct record_opts *opts = &rec->opts; |
| 1195 | struct perf_tool *tool = &rec->tool; |
| 1196 | int fd = perf_data__fd(data); |
| 1197 | int err = 0; |
| 1198 | |
| 1199 | if (rec->opts.tail_synthesize != tail) |
| 1200 | return 0; |
| 1201 | |
| 1202 | if (data->is_pipe) { |
| 1203 | /* |
| 1204 | * We need to synthesize events first, because some |
| 1205 | * features works on top of them (on report side). |
| 1206 | */ |
| 1207 | err = perf_event__synthesize_attrs(tool, rec->evlist, |
| 1208 | process_synthesized_event); |
| 1209 | if (err < 0) { |
| 1210 | pr_err("Couldn't synthesize attrs.\n"); |
| 1211 | goto out; |
| 1212 | } |
| 1213 | |
| 1214 | err = perf_event__synthesize_features(tool, session, rec->evlist, |
| 1215 | process_synthesized_event); |
| 1216 | if (err < 0) { |
| 1217 | pr_err("Couldn't synthesize features.\n"); |
| 1218 | return err; |
| 1219 | } |
| 1220 | |
| 1221 | if (have_tracepoints(&rec->evlist->entries)) { |
| 1222 | /* |
| 1223 | * FIXME err <= 0 here actually means that |
| 1224 | * there were no tracepoints so its not really |
| 1225 | * an error, just that we don't need to |
| 1226 | * synthesize anything. We really have to |
| 1227 | * return this more properly and also |
| 1228 | * propagate errors that now are calling die() |
| 1229 | */ |
| 1230 | err = perf_event__synthesize_tracing_data(tool, fd, rec->evlist, |
| 1231 | process_synthesized_event); |
| 1232 | if (err <= 0) { |
| 1233 | pr_err("Couldn't record tracing data.\n"); |
| 1234 | goto out; |
| 1235 | } |
| 1236 | rec->bytes_written += err; |
| 1237 | } |
| 1238 | } |
| 1239 | |
| 1240 | err = perf_event__synth_time_conv(record__pick_pc(rec), tool, |
| 1241 | process_synthesized_event, machine); |
| 1242 | if (err) |
| 1243 | goto out; |
| 1244 | |
| 1245 | if (rec->opts.full_auxtrace) { |
| 1246 | err = perf_event__synthesize_auxtrace_info(rec->itr, tool, |
| 1247 | session, process_synthesized_event); |
| 1248 | if (err) |
| 1249 | goto out; |
| 1250 | } |
| 1251 | |
| 1252 | if (!perf_evlist__exclude_kernel(rec->evlist)) { |
| 1253 | err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event, |
| 1254 | machine); |
| 1255 | WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n" |
| 1256 | "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" |
| 1257 | "Check /proc/kallsyms permission or run as root.\n"); |
| 1258 | |
| 1259 | err = perf_event__synthesize_modules(tool, process_synthesized_event, |
| 1260 | machine); |
| 1261 | WARN_ONCE(err < 0, "Couldn't record kernel module information.\n" |
| 1262 | "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" |
| 1263 | "Check /proc/modules permission or run as root.\n"); |
| 1264 | } |
| 1265 | |
| 1266 | if (perf_guest) { |
| 1267 | machines__process_guests(&session->machines, |
| 1268 | perf_event__synthesize_guest_os, tool); |
| 1269 | } |
| 1270 | |
| 1271 | err = perf_event__synthesize_extra_attr(&rec->tool, |
| 1272 | rec->evlist, |
| 1273 | process_synthesized_event, |
| 1274 | data->is_pipe); |
| 1275 | if (err) |
| 1276 | goto out; |
| 1277 | |
| 1278 | err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->threads, |
| 1279 | process_synthesized_event, |
| 1280 | NULL); |
| 1281 | if (err < 0) { |
| 1282 | pr_err("Couldn't synthesize thread map.\n"); |
| 1283 | return err; |
| 1284 | } |
| 1285 | |
| 1286 | err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->cpus, |
| 1287 | process_synthesized_event, NULL); |
| 1288 | if (err < 0) { |
| 1289 | pr_err("Couldn't synthesize cpu map.\n"); |
| 1290 | return err; |
| 1291 | } |
| 1292 | |
| 1293 | err = perf_event__synthesize_bpf_events(session, process_synthesized_event, |
| 1294 | machine, opts); |
| 1295 | if (err < 0) |
| 1296 | pr_warning("Couldn't synthesize bpf events.\n"); |
| 1297 | |
| 1298 | err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads, |
| 1299 | process_synthesized_event, opts->sample_address, |
| 1300 | 1); |
| 1301 | out: |
| 1302 | return err; |
| 1303 | } |
| 1304 | |
| 1305 | static int __cmd_record(struct record *rec, int argc, const char **argv) |
| 1306 | { |
| 1307 | int err; |
| 1308 | int status = 0; |
| 1309 | unsigned long waking = 0; |
| 1310 | const bool forks = argc > 0; |
| 1311 | struct perf_tool *tool = &rec->tool; |
| 1312 | struct record_opts *opts = &rec->opts; |
| 1313 | struct perf_data *data = &rec->data; |
| 1314 | struct perf_session *session; |
| 1315 | bool disabled = false, draining = false; |
| 1316 | struct perf_evlist *sb_evlist = NULL; |
| 1317 | int fd; |
| 1318 | float ratio = 0; |
| 1319 | |
| 1320 | atexit(record__sig_exit); |
| 1321 | signal(SIGCHLD, sig_handler); |
| 1322 | signal(SIGINT, sig_handler); |
| 1323 | signal(SIGTERM, sig_handler); |
| 1324 | signal(SIGSEGV, sigsegv_handler); |
| 1325 | |
| 1326 | if (rec->opts.record_namespaces) |
| 1327 | tool->namespace_events = true; |
| 1328 | |
| 1329 | if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) { |
| 1330 | signal(SIGUSR2, snapshot_sig_handler); |
| 1331 | if (rec->opts.auxtrace_snapshot_mode) |
| 1332 | trigger_on(&auxtrace_snapshot_trigger); |
| 1333 | if (rec->switch_output.enabled) |
| 1334 | trigger_on(&switch_output_trigger); |
| 1335 | } else { |
| 1336 | signal(SIGUSR2, SIG_IGN); |
| 1337 | } |
| 1338 | |
| 1339 | session = perf_session__new(data, false, tool); |
| 1340 | if (session == NULL) { |
| 1341 | pr_err("Perf session creation failed.\n"); |
| 1342 | return -1; |
| 1343 | } |
| 1344 | |
| 1345 | fd = perf_data__fd(data); |
| 1346 | rec->session = session; |
| 1347 | |
| 1348 | if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) { |
| 1349 | pr_err("Compression initialization failed.\n"); |
| 1350 | return -1; |
| 1351 | } |
| 1352 | |
| 1353 | session->header.env.comp_type = PERF_COMP_ZSTD; |
| 1354 | session->header.env.comp_level = rec->opts.comp_level; |
| 1355 | |
| 1356 | record__init_features(rec); |
| 1357 | |
| 1358 | if (rec->opts.use_clockid && rec->opts.clockid_res_ns) |
| 1359 | session->header.env.clockid_res_ns = rec->opts.clockid_res_ns; |
| 1360 | |
| 1361 | if (forks) { |
| 1362 | err = perf_evlist__prepare_workload(rec->evlist, &opts->target, |
| 1363 | argv, data->is_pipe, |
| 1364 | workload_exec_failed_signal); |
| 1365 | if (err < 0) { |
| 1366 | pr_err("Couldn't run the workload!\n"); |
| 1367 | status = err; |
| 1368 | goto out_delete_session; |
| 1369 | } |
| 1370 | } |
| 1371 | |
| 1372 | /* |
| 1373 | * If we have just single event and are sending data |
| 1374 | * through pipe, we need to force the ids allocation, |
| 1375 | * because we synthesize event name through the pipe |
| 1376 | * and need the id for that. |
| 1377 | */ |
| 1378 | if (data->is_pipe && rec->evlist->nr_entries == 1) |
| 1379 | rec->opts.sample_id = true; |
| 1380 | |
| 1381 | if (record__open(rec) != 0) { |
| 1382 | err = -1; |
| 1383 | goto out_child; |
| 1384 | } |
| 1385 | session->header.env.comp_mmap_len = session->evlist->mmap_len; |
| 1386 | |
| 1387 | err = bpf__apply_obj_config(); |
| 1388 | if (err) { |
| 1389 | char errbuf[BUFSIZ]; |
| 1390 | |
| 1391 | bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf)); |
| 1392 | pr_err("ERROR: Apply config to BPF failed: %s\n", |
| 1393 | errbuf); |
| 1394 | goto out_child; |
| 1395 | } |
| 1396 | |
| 1397 | /* |
| 1398 | * Normally perf_session__new would do this, but it doesn't have the |
| 1399 | * evlist. |
| 1400 | */ |
| 1401 | if (rec->tool.ordered_events && !perf_evlist__sample_id_all(rec->evlist)) { |
| 1402 | pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n"); |
| 1403 | rec->tool.ordered_events = false; |
| 1404 | } |
| 1405 | |
| 1406 | if (!rec->evlist->nr_groups) |
| 1407 | perf_header__clear_feat(&session->header, HEADER_GROUP_DESC); |
| 1408 | |
| 1409 | if (data->is_pipe) { |
| 1410 | err = perf_header__write_pipe(fd); |
| 1411 | if (err < 0) |
| 1412 | goto out_child; |
| 1413 | } else { |
| 1414 | err = perf_session__write_header(session, rec->evlist, fd, false); |
| 1415 | if (err < 0) |
| 1416 | goto out_child; |
| 1417 | } |
| 1418 | |
| 1419 | if (!rec->no_buildid |
| 1420 | && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) { |
| 1421 | pr_err("Couldn't generate buildids. " |
| 1422 | "Use --no-buildid to profile anyway.\n"); |
| 1423 | err = -1; |
| 1424 | goto out_child; |
| 1425 | } |
| 1426 | |
| 1427 | if (!opts->no_bpf_event) |
| 1428 | bpf_event__add_sb_event(&sb_evlist, &session->header.env); |
| 1429 | |
| 1430 | if (perf_evlist__start_sb_thread(sb_evlist, &rec->opts.target)) { |
| 1431 | pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n"); |
| 1432 | opts->no_bpf_event = true; |
| 1433 | } |
| 1434 | |
| 1435 | err = record__synthesize(rec, false); |
| 1436 | if (err < 0) |
| 1437 | goto out_child; |
| 1438 | |
| 1439 | if (rec->realtime_prio) { |
| 1440 | struct sched_param param; |
| 1441 | |
| 1442 | param.sched_priority = rec->realtime_prio; |
| 1443 | if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { |
| 1444 | pr_err("Could not set realtime priority.\n"); |
| 1445 | err = -1; |
| 1446 | goto out_child; |
| 1447 | } |
| 1448 | } |
| 1449 | |
| 1450 | /* |
| 1451 | * When perf is starting the traced process, all the events |
| 1452 | * (apart from group members) have enable_on_exec=1 set, |
| 1453 | * so don't spoil it by prematurely enabling them. |
| 1454 | */ |
| 1455 | if (!target__none(&opts->target) && !opts->initial_delay) |
| 1456 | perf_evlist__enable(rec->evlist); |
| 1457 | |
| 1458 | /* |
| 1459 | * Let the child rip |
| 1460 | */ |
| 1461 | if (forks) { |
| 1462 | struct machine *machine = &session->machines.host; |
| 1463 | union perf_event *event; |
| 1464 | pid_t tgid; |
| 1465 | |
| 1466 | event = malloc(sizeof(event->comm) + machine->id_hdr_size); |
| 1467 | if (event == NULL) { |
| 1468 | err = -ENOMEM; |
| 1469 | goto out_child; |
| 1470 | } |
| 1471 | |
| 1472 | /* |
| 1473 | * Some H/W events are generated before COMM event |
| 1474 | * which is emitted during exec(), so perf script |
| 1475 | * cannot see a correct process name for those events. |
| 1476 | * Synthesize COMM event to prevent it. |
| 1477 | */ |
| 1478 | tgid = perf_event__synthesize_comm(tool, event, |
| 1479 | rec->evlist->workload.pid, |
| 1480 | process_synthesized_event, |
| 1481 | machine); |
| 1482 | free(event); |
| 1483 | |
| 1484 | if (tgid == -1) |
| 1485 | goto out_child; |
| 1486 | |
| 1487 | event = malloc(sizeof(event->namespaces) + |
| 1488 | (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + |
| 1489 | machine->id_hdr_size); |
| 1490 | if (event == NULL) { |
| 1491 | err = -ENOMEM; |
| 1492 | goto out_child; |
| 1493 | } |
| 1494 | |
| 1495 | /* |
| 1496 | * Synthesize NAMESPACES event for the command specified. |
| 1497 | */ |
| 1498 | perf_event__synthesize_namespaces(tool, event, |
| 1499 | rec->evlist->workload.pid, |
| 1500 | tgid, process_synthesized_event, |
| 1501 | machine); |
| 1502 | free(event); |
| 1503 | |
| 1504 | perf_evlist__start_workload(rec->evlist); |
| 1505 | } |
| 1506 | |
| 1507 | if (opts->initial_delay) { |
| 1508 | usleep(opts->initial_delay * USEC_PER_MSEC); |
| 1509 | perf_evlist__enable(rec->evlist); |
| 1510 | } |
| 1511 | |
| 1512 | trigger_ready(&auxtrace_snapshot_trigger); |
| 1513 | trigger_ready(&switch_output_trigger); |
| 1514 | perf_hooks__invoke_record_start(); |
| 1515 | for (;;) { |
| 1516 | unsigned long long hits = rec->samples; |
| 1517 | |
| 1518 | /* |
| 1519 | * rec->evlist->bkw_mmap_state is possible to be |
| 1520 | * BKW_MMAP_EMPTY here: when done == true and |
| 1521 | * hits != rec->samples in previous round. |
| 1522 | * |
| 1523 | * perf_evlist__toggle_bkw_mmap ensure we never |
| 1524 | * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING. |
| 1525 | */ |
| 1526 | if (trigger_is_hit(&switch_output_trigger) || done || draining) |
| 1527 | perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING); |
| 1528 | |
| 1529 | if (record__mmap_read_all(rec, false) < 0) { |
| 1530 | trigger_error(&auxtrace_snapshot_trigger); |
| 1531 | trigger_error(&switch_output_trigger); |
| 1532 | err = -1; |
| 1533 | goto out_child; |
| 1534 | } |
| 1535 | |
| 1536 | if (auxtrace_record__snapshot_started) { |
| 1537 | auxtrace_record__snapshot_started = 0; |
| 1538 | if (!trigger_is_error(&auxtrace_snapshot_trigger)) |
| 1539 | record__read_auxtrace_snapshot(rec); |
| 1540 | if (trigger_is_error(&auxtrace_snapshot_trigger)) { |
| 1541 | pr_err("AUX area tracing snapshot failed\n"); |
| 1542 | err = -1; |
| 1543 | goto out_child; |
| 1544 | } |
| 1545 | } |
| 1546 | |
| 1547 | if (trigger_is_hit(&switch_output_trigger)) { |
| 1548 | /* |
| 1549 | * If switch_output_trigger is hit, the data in |
| 1550 | * overwritable ring buffer should have been collected, |
| 1551 | * so bkw_mmap_state should be set to BKW_MMAP_EMPTY. |
| 1552 | * |
| 1553 | * If SIGUSR2 raise after or during record__mmap_read_all(), |
| 1554 | * record__mmap_read_all() didn't collect data from |
| 1555 | * overwritable ring buffer. Read again. |
| 1556 | */ |
| 1557 | if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING) |
| 1558 | continue; |
| 1559 | trigger_ready(&switch_output_trigger); |
| 1560 | |
| 1561 | /* |
| 1562 | * Reenable events in overwrite ring buffer after |
| 1563 | * record__mmap_read_all(): we should have collected |
| 1564 | * data from it. |
| 1565 | */ |
| 1566 | perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING); |
| 1567 | |
| 1568 | if (!quiet) |
| 1569 | fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n", |
| 1570 | waking); |
| 1571 | waking = 0; |
| 1572 | fd = record__switch_output(rec, false); |
| 1573 | if (fd < 0) { |
| 1574 | pr_err("Failed to switch to new file\n"); |
| 1575 | trigger_error(&switch_output_trigger); |
| 1576 | err = fd; |
| 1577 | goto out_child; |
| 1578 | } |
| 1579 | |
| 1580 | /* re-arm the alarm */ |
| 1581 | if (rec->switch_output.time) |
| 1582 | alarm(rec->switch_output.time); |
| 1583 | } |
| 1584 | |
| 1585 | if (hits == rec->samples) { |
| 1586 | if (done || draining) |
| 1587 | break; |
| 1588 | err = perf_evlist__poll(rec->evlist, -1); |
| 1589 | /* |
| 1590 | * Propagate error, only if there's any. Ignore positive |
| 1591 | * number of returned events and interrupt error. |
| 1592 | */ |
| 1593 | if (err > 0 || (err < 0 && errno == EINTR)) |
| 1594 | err = 0; |
| 1595 | waking++; |
| 1596 | |
| 1597 | if (perf_evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0) |
| 1598 | draining = true; |
| 1599 | } |
| 1600 | |
| 1601 | /* |
| 1602 | * When perf is starting the traced process, at the end events |
| 1603 | * die with the process and we wait for that. Thus no need to |
| 1604 | * disable events in this case. |
| 1605 | */ |
| 1606 | if (done && !disabled && !target__none(&opts->target)) { |
| 1607 | trigger_off(&auxtrace_snapshot_trigger); |
| 1608 | perf_evlist__disable(rec->evlist); |
| 1609 | disabled = true; |
| 1610 | } |
| 1611 | } |
| 1612 | trigger_off(&auxtrace_snapshot_trigger); |
| 1613 | trigger_off(&switch_output_trigger); |
| 1614 | |
| 1615 | if (forks && workload_exec_errno) { |
| 1616 | char msg[STRERR_BUFSIZE]; |
| 1617 | const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg)); |
| 1618 | pr_err("Workload failed: %s\n", emsg); |
| 1619 | err = -1; |
| 1620 | goto out_child; |
| 1621 | } |
| 1622 | |
| 1623 | if (!quiet) |
| 1624 | fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); |
| 1625 | |
| 1626 | if (target__none(&rec->opts.target)) |
| 1627 | record__synthesize_workload(rec, true); |
| 1628 | |
| 1629 | out_child: |
| 1630 | record__mmap_read_all(rec, true); |
| 1631 | record__aio_mmap_read_sync(rec); |
| 1632 | |
| 1633 | if (rec->session->bytes_transferred && rec->session->bytes_compressed) { |
| 1634 | ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed; |
| 1635 | session->header.env.comp_ratio = ratio + 0.5; |
| 1636 | } |
| 1637 | |
| 1638 | if (forks) { |
| 1639 | int exit_status; |
| 1640 | |
| 1641 | if (!child_finished) |
| 1642 | kill(rec->evlist->workload.pid, SIGTERM); |
| 1643 | |
| 1644 | wait(&exit_status); |
| 1645 | |
| 1646 | if (err < 0) |
| 1647 | status = err; |
| 1648 | else if (WIFEXITED(exit_status)) |
| 1649 | status = WEXITSTATUS(exit_status); |
| 1650 | else if (WIFSIGNALED(exit_status)) |
| 1651 | signr = WTERMSIG(exit_status); |
| 1652 | } else |
| 1653 | status = err; |
| 1654 | |
| 1655 | record__synthesize(rec, true); |
| 1656 | /* this will be recalculated during process_buildids() */ |
| 1657 | rec->samples = 0; |
| 1658 | |
| 1659 | if (!err) { |
| 1660 | if (!rec->timestamp_filename) { |
| 1661 | record__finish_output(rec); |
| 1662 | } else { |
| 1663 | fd = record__switch_output(rec, true); |
| 1664 | if (fd < 0) { |
| 1665 | status = fd; |
| 1666 | goto out_delete_session; |
| 1667 | } |
| 1668 | } |
| 1669 | } |
| 1670 | |
| 1671 | perf_hooks__invoke_record_end(); |
| 1672 | |
| 1673 | if (!err && !quiet) { |
| 1674 | char samples[128]; |
| 1675 | const char *postfix = rec->timestamp_filename ? |
| 1676 | ".<timestamp>" : ""; |
| 1677 | |
| 1678 | if (rec->samples && !rec->opts.full_auxtrace) |
| 1679 | scnprintf(samples, sizeof(samples), |
| 1680 | " (%" PRIu64 " samples)", rec->samples); |
| 1681 | else |
| 1682 | samples[0] = '\0'; |
| 1683 | |
| 1684 | fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s", |
| 1685 | perf_data__size(data) / 1024.0 / 1024.0, |
| 1686 | data->path, postfix, samples); |
| 1687 | if (ratio) { |
| 1688 | fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)", |
| 1689 | rec->session->bytes_transferred / 1024.0 / 1024.0, |
| 1690 | ratio); |
| 1691 | } |
| 1692 | fprintf(stderr, " ]\n"); |
| 1693 | } |
| 1694 | |
| 1695 | out_delete_session: |
| 1696 | zstd_fini(&session->zstd_data); |
| 1697 | perf_session__delete(session); |
| 1698 | |
| 1699 | if (!opts->no_bpf_event) |
| 1700 | perf_evlist__stop_sb_thread(sb_evlist); |
| 1701 | return status; |
| 1702 | } |
| 1703 | |
| 1704 | static void callchain_debug(struct callchain_param *callchain) |
| 1705 | { |
| 1706 | static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" }; |
| 1707 | |
| 1708 | pr_debug("callchain: type %s\n", str[callchain->record_mode]); |
| 1709 | |
| 1710 | if (callchain->record_mode == CALLCHAIN_DWARF) |
| 1711 | pr_debug("callchain: stack dump size %d\n", |
| 1712 | callchain->dump_size); |
| 1713 | } |
| 1714 | |
| 1715 | int record_opts__parse_callchain(struct record_opts *record, |
| 1716 | struct callchain_param *callchain, |
| 1717 | const char *arg, bool unset) |
| 1718 | { |
| 1719 | int ret; |
| 1720 | callchain->enabled = !unset; |
| 1721 | |
| 1722 | /* --no-call-graph */ |
| 1723 | if (unset) { |
| 1724 | callchain->record_mode = CALLCHAIN_NONE; |
| 1725 | pr_debug("callchain: disabled\n"); |
| 1726 | return 0; |
| 1727 | } |
| 1728 | |
| 1729 | ret = parse_callchain_record_opt(arg, callchain); |
| 1730 | if (!ret) { |
| 1731 | /* Enable data address sampling for DWARF unwind. */ |
| 1732 | if (callchain->record_mode == CALLCHAIN_DWARF) |
| 1733 | record->sample_address = true; |
| 1734 | callchain_debug(callchain); |
| 1735 | } |
| 1736 | |
| 1737 | return ret; |
| 1738 | } |
| 1739 | |
| 1740 | int record_parse_callchain_opt(const struct option *opt, |
| 1741 | const char *arg, |
| 1742 | int unset) |
| 1743 | { |
| 1744 | return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset); |
| 1745 | } |
| 1746 | |
| 1747 | int record_callchain_opt(const struct option *opt, |
| 1748 | const char *arg __maybe_unused, |
| 1749 | int unset __maybe_unused) |
| 1750 | { |
| 1751 | struct callchain_param *callchain = opt->value; |
| 1752 | |
| 1753 | callchain->enabled = true; |
| 1754 | |
| 1755 | if (callchain->record_mode == CALLCHAIN_NONE) |
| 1756 | callchain->record_mode = CALLCHAIN_FP; |
| 1757 | |
| 1758 | callchain_debug(callchain); |
| 1759 | return 0; |
| 1760 | } |
| 1761 | |
| 1762 | static int perf_record_config(const char *var, const char *value, void *cb) |
| 1763 | { |
| 1764 | struct record *rec = cb; |
| 1765 | |
| 1766 | if (!strcmp(var, "record.build-id")) { |
| 1767 | if (!strcmp(value, "cache")) |
| 1768 | rec->no_buildid_cache = false; |
| 1769 | else if (!strcmp(value, "no-cache")) |
| 1770 | rec->no_buildid_cache = true; |
| 1771 | else if (!strcmp(value, "skip")) |
| 1772 | rec->no_buildid = true; |
| 1773 | else |
| 1774 | return -1; |
| 1775 | return 0; |
| 1776 | } |
| 1777 | if (!strcmp(var, "record.call-graph")) { |
| 1778 | var = "call-graph.record-mode"; |
| 1779 | return perf_default_config(var, value, cb); |
| 1780 | } |
| 1781 | #ifdef HAVE_AIO_SUPPORT |
| 1782 | if (!strcmp(var, "record.aio")) { |
| 1783 | rec->opts.nr_cblocks = strtol(value, NULL, 0); |
| 1784 | if (!rec->opts.nr_cblocks) |
| 1785 | rec->opts.nr_cblocks = nr_cblocks_default; |
| 1786 | } |
| 1787 | #endif |
| 1788 | |
| 1789 | return 0; |
| 1790 | } |
| 1791 | |
| 1792 | struct clockid_map { |
| 1793 | const char *name; |
| 1794 | int clockid; |
| 1795 | }; |
| 1796 | |
| 1797 | #define CLOCKID_MAP(n, c) \ |
| 1798 | { .name = n, .clockid = (c), } |
| 1799 | |
| 1800 | #define CLOCKID_END { .name = NULL, } |
| 1801 | |
| 1802 | |
| 1803 | /* |
| 1804 | * Add the missing ones, we need to build on many distros... |
| 1805 | */ |
| 1806 | #ifndef CLOCK_MONOTONIC_RAW |
| 1807 | #define CLOCK_MONOTONIC_RAW 4 |
| 1808 | #endif |
| 1809 | #ifndef CLOCK_BOOTTIME |
| 1810 | #define CLOCK_BOOTTIME 7 |
| 1811 | #endif |
| 1812 | #ifndef CLOCK_TAI |
| 1813 | #define CLOCK_TAI 11 |
| 1814 | #endif |
| 1815 | |
| 1816 | static const struct clockid_map clockids[] = { |
| 1817 | /* available for all events, NMI safe */ |
| 1818 | CLOCKID_MAP("monotonic", CLOCK_MONOTONIC), |
| 1819 | CLOCKID_MAP("monotonic_raw", CLOCK_MONOTONIC_RAW), |
| 1820 | |
| 1821 | /* available for some events */ |
| 1822 | CLOCKID_MAP("realtime", CLOCK_REALTIME), |
| 1823 | CLOCKID_MAP("boottime", CLOCK_BOOTTIME), |
| 1824 | CLOCKID_MAP("tai", CLOCK_TAI), |
| 1825 | |
| 1826 | /* available for the lazy */ |
| 1827 | CLOCKID_MAP("mono", CLOCK_MONOTONIC), |
| 1828 | CLOCKID_MAP("raw", CLOCK_MONOTONIC_RAW), |
| 1829 | CLOCKID_MAP("real", CLOCK_REALTIME), |
| 1830 | CLOCKID_MAP("boot", CLOCK_BOOTTIME), |
| 1831 | |
| 1832 | CLOCKID_END, |
| 1833 | }; |
| 1834 | |
| 1835 | static int get_clockid_res(clockid_t clk_id, u64 *res_ns) |
| 1836 | { |
| 1837 | struct timespec res; |
| 1838 | |
| 1839 | *res_ns = 0; |
| 1840 | if (!clock_getres(clk_id, &res)) |
| 1841 | *res_ns = res.tv_nsec + res.tv_sec * NSEC_PER_SEC; |
| 1842 | else |
| 1843 | pr_warning("WARNING: Failed to determine specified clock resolution.\n"); |
| 1844 | |
| 1845 | return 0; |
| 1846 | } |
| 1847 | |
| 1848 | static int parse_clockid(const struct option *opt, const char *str, int unset) |
| 1849 | { |
| 1850 | struct record_opts *opts = (struct record_opts *)opt->value; |
| 1851 | const struct clockid_map *cm; |
| 1852 | const char *ostr = str; |
| 1853 | |
| 1854 | if (unset) { |
| 1855 | opts->use_clockid = 0; |
| 1856 | return 0; |
| 1857 | } |
| 1858 | |
| 1859 | /* no arg passed */ |
| 1860 | if (!str) |
| 1861 | return 0; |
| 1862 | |
| 1863 | /* no setting it twice */ |
| 1864 | if (opts->use_clockid) |
| 1865 | return -1; |
| 1866 | |
| 1867 | opts->use_clockid = true; |
| 1868 | |
| 1869 | /* if its a number, we're done */ |
| 1870 | if (sscanf(str, "%d", &opts->clockid) == 1) |
| 1871 | return get_clockid_res(opts->clockid, &opts->clockid_res_ns); |
| 1872 | |
| 1873 | /* allow a "CLOCK_" prefix to the name */ |
| 1874 | if (!strncasecmp(str, "CLOCK_", 6)) |
| 1875 | str += 6; |
| 1876 | |
| 1877 | for (cm = clockids; cm->name; cm++) { |
| 1878 | if (!strcasecmp(str, cm->name)) { |
| 1879 | opts->clockid = cm->clockid; |
| 1880 | return get_clockid_res(opts->clockid, |
| 1881 | &opts->clockid_res_ns); |
| 1882 | } |
| 1883 | } |
| 1884 | |
| 1885 | opts->use_clockid = false; |
| 1886 | ui__warning("unknown clockid %s, check man page\n", ostr); |
| 1887 | return -1; |
| 1888 | } |
| 1889 | |
| 1890 | static int record__parse_affinity(const struct option *opt, const char *str, int unset) |
| 1891 | { |
| 1892 | struct record_opts *opts = (struct record_opts *)opt->value; |
| 1893 | |
| 1894 | if (unset || !str) |
| 1895 | return 0; |
| 1896 | |
| 1897 | if (!strcasecmp(str, "node")) |
| 1898 | opts->affinity = PERF_AFFINITY_NODE; |
| 1899 | else if (!strcasecmp(str, "cpu")) |
| 1900 | opts->affinity = PERF_AFFINITY_CPU; |
| 1901 | |
| 1902 | return 0; |
| 1903 | } |
| 1904 | |
| 1905 | static int record__parse_mmap_pages(const struct option *opt, |
| 1906 | const char *str, |
| 1907 | int unset __maybe_unused) |
| 1908 | { |
| 1909 | struct record_opts *opts = opt->value; |
| 1910 | char *s, *p; |
| 1911 | unsigned int mmap_pages; |
| 1912 | int ret; |
| 1913 | |
| 1914 | if (!str) |
| 1915 | return -EINVAL; |
| 1916 | |
| 1917 | s = strdup(str); |
| 1918 | if (!s) |
| 1919 | return -ENOMEM; |
| 1920 | |
| 1921 | p = strchr(s, ','); |
| 1922 | if (p) |
| 1923 | *p = '\0'; |
| 1924 | |
| 1925 | if (*s) { |
| 1926 | ret = __perf_evlist__parse_mmap_pages(&mmap_pages, s); |
| 1927 | if (ret) |
| 1928 | goto out_free; |
| 1929 | opts->mmap_pages = mmap_pages; |
| 1930 | } |
| 1931 | |
| 1932 | if (!p) { |
| 1933 | ret = 0; |
| 1934 | goto out_free; |
| 1935 | } |
| 1936 | |
| 1937 | ret = __perf_evlist__parse_mmap_pages(&mmap_pages, p + 1); |
| 1938 | if (ret) |
| 1939 | goto out_free; |
| 1940 | |
| 1941 | opts->auxtrace_mmap_pages = mmap_pages; |
| 1942 | |
| 1943 | out_free: |
| 1944 | free(s); |
| 1945 | return ret; |
| 1946 | } |
| 1947 | |
| 1948 | static void switch_output_size_warn(struct record *rec) |
| 1949 | { |
| 1950 | u64 wakeup_size = perf_evlist__mmap_size(rec->opts.mmap_pages); |
| 1951 | struct switch_output *s = &rec->switch_output; |
| 1952 | |
| 1953 | wakeup_size /= 2; |
| 1954 | |
| 1955 | if (s->size < wakeup_size) { |
| 1956 | char buf[100]; |
| 1957 | |
| 1958 | unit_number__scnprintf(buf, sizeof(buf), wakeup_size); |
| 1959 | pr_warning("WARNING: switch-output data size lower than " |
| 1960 | "wakeup kernel buffer size (%s) " |
| 1961 | "expect bigger perf.data sizes\n", buf); |
| 1962 | } |
| 1963 | } |
| 1964 | |
| 1965 | static int switch_output_setup(struct record *rec) |
| 1966 | { |
| 1967 | struct switch_output *s = &rec->switch_output; |
| 1968 | static struct parse_tag tags_size[] = { |
| 1969 | { .tag = 'B', .mult = 1 }, |
| 1970 | { .tag = 'K', .mult = 1 << 10 }, |
| 1971 | { .tag = 'M', .mult = 1 << 20 }, |
| 1972 | { .tag = 'G', .mult = 1 << 30 }, |
| 1973 | { .tag = 0 }, |
| 1974 | }; |
| 1975 | static struct parse_tag tags_time[] = { |
| 1976 | { .tag = 's', .mult = 1 }, |
| 1977 | { .tag = 'm', .mult = 60 }, |
| 1978 | { .tag = 'h', .mult = 60*60 }, |
| 1979 | { .tag = 'd', .mult = 60*60*24 }, |
| 1980 | { .tag = 0 }, |
| 1981 | }; |
| 1982 | unsigned long val; |
| 1983 | |
| 1984 | if (!s->set) |
| 1985 | return 0; |
| 1986 | |
| 1987 | if (!strcmp(s->str, "signal")) { |
| 1988 | s->signal = true; |
| 1989 | pr_debug("switch-output with SIGUSR2 signal\n"); |
| 1990 | goto enabled; |
| 1991 | } |
| 1992 | |
| 1993 | val = parse_tag_value(s->str, tags_size); |
| 1994 | if (val != (unsigned long) -1) { |
| 1995 | s->size = val; |
| 1996 | pr_debug("switch-output with %s size threshold\n", s->str); |
| 1997 | goto enabled; |
| 1998 | } |
| 1999 | |
| 2000 | val = parse_tag_value(s->str, tags_time); |
| 2001 | if (val != (unsigned long) -1) { |
| 2002 | s->time = val; |
| 2003 | pr_debug("switch-output with %s time threshold (%lu seconds)\n", |
| 2004 | s->str, s->time); |
| 2005 | goto enabled; |
| 2006 | } |
| 2007 | |
| 2008 | return -1; |
| 2009 | |
| 2010 | enabled: |
| 2011 | rec->timestamp_filename = true; |
| 2012 | s->enabled = true; |
| 2013 | |
| 2014 | if (s->size && !rec->opts.no_buffering) |
| 2015 | switch_output_size_warn(rec); |
| 2016 | |
| 2017 | return 0; |
| 2018 | } |
| 2019 | |
| 2020 | static const char * const __record_usage[] = { |
| 2021 | "perf record [<options>] [<command>]", |
| 2022 | "perf record [<options>] -- <command> [<options>]", |
| 2023 | NULL |
| 2024 | }; |
| 2025 | const char * const *record_usage = __record_usage; |
| 2026 | |
| 2027 | /* |
| 2028 | * XXX Ideally would be local to cmd_record() and passed to a record__new |
| 2029 | * because we need to have access to it in record__exit, that is called |
| 2030 | * after cmd_record() exits, but since record_options need to be accessible to |
| 2031 | * builtin-script, leave it here. |
| 2032 | * |
| 2033 | * At least we don't ouch it in all the other functions here directly. |
| 2034 | * |
| 2035 | * Just say no to tons of global variables, sigh. |
| 2036 | */ |
| 2037 | static struct record record = { |
| 2038 | .opts = { |
| 2039 | .sample_time = true, |
| 2040 | .mmap_pages = UINT_MAX, |
| 2041 | .user_freq = UINT_MAX, |
| 2042 | .user_interval = ULLONG_MAX, |
| 2043 | .freq = 4000, |
| 2044 | .target = { |
| 2045 | .uses_mmap = true, |
| 2046 | .default_per_cpu = true, |
| 2047 | }, |
| 2048 | .mmap_flush = MMAP_FLUSH_DEFAULT, |
| 2049 | }, |
| 2050 | .tool = { |
| 2051 | .sample = process_sample_event, |
| 2052 | .fork = perf_event__process_fork, |
| 2053 | .exit = perf_event__process_exit, |
| 2054 | .comm = perf_event__process_comm, |
| 2055 | .namespaces = perf_event__process_namespaces, |
| 2056 | .mmap = perf_event__process_mmap, |
| 2057 | .mmap2 = perf_event__process_mmap2, |
| 2058 | .ordered_events = true, |
| 2059 | }, |
| 2060 | }; |
| 2061 | |
| 2062 | const char record_callchain_help[] = CALLCHAIN_RECORD_HELP |
| 2063 | "\n\t\t\t\tDefault: fp"; |
| 2064 | |
| 2065 | static bool dry_run; |
| 2066 | |
| 2067 | /* |
| 2068 | * XXX Will stay a global variable till we fix builtin-script.c to stop messing |
| 2069 | * with it and switch to use the library functions in perf_evlist that came |
| 2070 | * from builtin-record.c, i.e. use record_opts, |
| 2071 | * perf_evlist__prepare_workload, etc instead of fork+exec'in 'perf record', |
| 2072 | * using pipes, etc. |
| 2073 | */ |
| 2074 | static struct option __record_options[] = { |
| 2075 | OPT_CALLBACK('e', "event", &record.evlist, "event", |
| 2076 | "event selector. use 'perf list' to list available events", |
| 2077 | parse_events_option), |
| 2078 | OPT_CALLBACK(0, "filter", &record.evlist, "filter", |
| 2079 | "event filter", parse_filter), |
| 2080 | OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist, |
| 2081 | NULL, "don't record events from perf itself", |
| 2082 | exclude_perf), |
| 2083 | OPT_STRING('p', "pid", &record.opts.target.pid, "pid", |
| 2084 | "record events on existing process id"), |
| 2085 | OPT_STRING('t', "tid", &record.opts.target.tid, "tid", |
| 2086 | "record events on existing thread id"), |
| 2087 | OPT_INTEGER('r', "realtime", &record.realtime_prio, |
| 2088 | "collect data with this RT SCHED_FIFO priority"), |
| 2089 | OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering, |
| 2090 | "collect data without buffering"), |
| 2091 | OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples, |
| 2092 | "collect raw sample records from all opened counters"), |
| 2093 | OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide, |
| 2094 | "system-wide collection from all CPUs"), |
| 2095 | OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu", |
| 2096 | "list of cpus to monitor"), |
| 2097 | OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"), |
| 2098 | OPT_STRING('o', "output", &record.data.path, "file", |
| 2099 | "output file name"), |
| 2100 | OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit, |
| 2101 | &record.opts.no_inherit_set, |
| 2102 | "child tasks do not inherit counters"), |
| 2103 | OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize, |
| 2104 | "synthesize non-sample events at the end of output"), |
| 2105 | OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"), |
| 2106 | OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "record bpf events"), |
| 2107 | OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq, |
| 2108 | "Fail if the specified frequency can't be used"), |
| 2109 | OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'", |
| 2110 | "profile at this frequency", |
| 2111 | record__parse_freq), |
| 2112 | OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]", |
| 2113 | "number of mmap data pages and AUX area tracing mmap pages", |
| 2114 | record__parse_mmap_pages), |
| 2115 | OPT_CALLBACK(0, "mmap-flush", &record.opts, "number", |
| 2116 | "Minimal number of bytes that is extracted from mmap data pages (default: 1)", |
| 2117 | record__mmap_flush_parse), |
| 2118 | OPT_BOOLEAN(0, "group", &record.opts.group, |
| 2119 | "put the counters into a counter group"), |
| 2120 | OPT_CALLBACK_NOOPT('g', NULL, &callchain_param, |
| 2121 | NULL, "enables call-graph recording" , |
| 2122 | &record_callchain_opt), |
| 2123 | OPT_CALLBACK(0, "call-graph", &record.opts, |
| 2124 | "record_mode[,record_size]", record_callchain_help, |
| 2125 | &record_parse_callchain_opt), |
| 2126 | OPT_INCR('v', "verbose", &verbose, |
| 2127 | "be more verbose (show counter open errors, etc)"), |
| 2128 | OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"), |
| 2129 | OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat, |
| 2130 | "per thread counts"), |
| 2131 | OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"), |
| 2132 | OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr, |
| 2133 | "Record the sample physical addresses"), |
| 2134 | OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"), |
| 2135 | OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time, |
| 2136 | &record.opts.sample_time_set, |
| 2137 | "Record the sample timestamps"), |
| 2138 | OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set, |
| 2139 | "Record the sample period"), |
| 2140 | OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples, |
| 2141 | "don't sample"), |
| 2142 | OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache, |
| 2143 | &record.no_buildid_cache_set, |
| 2144 | "do not update the buildid cache"), |
| 2145 | OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid, |
| 2146 | &record.no_buildid_set, |
| 2147 | "do not collect buildids in perf.data"), |
| 2148 | OPT_CALLBACK('G', "cgroup", &record.evlist, "name", |
| 2149 | "monitor event in cgroup name only", |
| 2150 | parse_cgroups), |
| 2151 | OPT_UINTEGER('D', "delay", &record.opts.initial_delay, |
| 2152 | "ms to wait before starting measurement after program start"), |
| 2153 | OPT_STRING('u', "uid", &record.opts.target.uid_str, "user", |
| 2154 | "user to profile"), |
| 2155 | |
| 2156 | OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack, |
| 2157 | "branch any", "sample any taken branches", |
| 2158 | parse_branch_stack), |
| 2159 | |
| 2160 | OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack, |
| 2161 | "branch filter mask", "branch stack filter modes", |
| 2162 | parse_branch_stack), |
| 2163 | OPT_BOOLEAN('W', "weight", &record.opts.sample_weight, |
| 2164 | "sample by weight (on special events only)"), |
| 2165 | OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction, |
| 2166 | "sample transaction flags (special events only)"), |
| 2167 | OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread, |
| 2168 | "use per-thread mmaps"), |
| 2169 | OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register", |
| 2170 | "sample selected machine registers on interrupt," |
| 2171 | " use '-I?' to list register names", parse_intr_regs), |
| 2172 | OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register", |
| 2173 | "sample selected machine registers on interrupt," |
| 2174 | " use '--user-regs=?' to list register names", parse_user_regs), |
| 2175 | OPT_BOOLEAN(0, "running-time", &record.opts.running_time, |
| 2176 | "Record running/enabled time of read (:S) events"), |
| 2177 | OPT_CALLBACK('k', "clockid", &record.opts, |
| 2178 | "clockid", "clockid to use for events, see clock_gettime()", |
| 2179 | parse_clockid), |
| 2180 | OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts, |
| 2181 | "opts", "AUX area tracing Snapshot Mode", ""), |
| 2182 | OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout, |
| 2183 | "per thread proc mmap processing timeout in ms"), |
| 2184 | OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces, |
| 2185 | "Record namespaces events"), |
| 2186 | OPT_BOOLEAN(0, "switch-events", &record.opts.record_switch_events, |
| 2187 | "Record context switch events"), |
| 2188 | OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel, |
| 2189 | "Configure all used events to run in kernel space.", |
| 2190 | PARSE_OPT_EXCLUSIVE), |
| 2191 | OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user, |
| 2192 | "Configure all used events to run in user space.", |
| 2193 | PARSE_OPT_EXCLUSIVE), |
| 2194 | OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains, |
| 2195 | "collect kernel callchains"), |
| 2196 | OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains, |
| 2197 | "collect user callchains"), |
| 2198 | OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path", |
| 2199 | "clang binary to use for compiling BPF scriptlets"), |
| 2200 | OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options", |
| 2201 | "options passed to clang when compiling BPF scriptlets"), |
| 2202 | OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name, |
| 2203 | "file", "vmlinux pathname"), |
| 2204 | OPT_BOOLEAN(0, "buildid-all", &record.buildid_all, |
| 2205 | "Record build-id of all DSOs regardless of hits"), |
| 2206 | OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename, |
| 2207 | "append timestamp to output filename"), |
| 2208 | OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary, |
| 2209 | "Record timestamp boundary (time of first/last samples)"), |
| 2210 | OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str, |
| 2211 | &record.switch_output.set, "signal or size[BKMG] or time[smhd]", |
| 2212 | "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold", |
| 2213 | "signal"), |
| 2214 | OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files, |
| 2215 | "Limit number of switch output generated files"), |
| 2216 | OPT_BOOLEAN(0, "dry-run", &dry_run, |
| 2217 | "Parse options then exit"), |
| 2218 | #ifdef HAVE_AIO_SUPPORT |
| 2219 | OPT_CALLBACK_OPTARG(0, "aio", &record.opts, |
| 2220 | &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)", |
| 2221 | record__aio_parse), |
| 2222 | #endif |
| 2223 | OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu", |
| 2224 | "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer", |
| 2225 | record__parse_affinity), |
| 2226 | #ifdef HAVE_ZSTD_SUPPORT |
| 2227 | OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default, |
| 2228 | "n", "Compressed records using specified level (default: 1 - fastest compression, 22 - greatest compression)", |
| 2229 | record__parse_comp_level), |
| 2230 | #endif |
| 2231 | OPT_END() |
| 2232 | }; |
| 2233 | |
| 2234 | struct option *record_options = __record_options; |
| 2235 | |
| 2236 | int cmd_record(int argc, const char **argv) |
| 2237 | { |
| 2238 | int err; |
| 2239 | struct record *rec = &record; |
| 2240 | char errbuf[BUFSIZ]; |
| 2241 | |
| 2242 | setlocale(LC_ALL, ""); |
| 2243 | |
| 2244 | #ifndef HAVE_LIBBPF_SUPPORT |
| 2245 | # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c) |
| 2246 | set_nobuild('\0', "clang-path", true); |
| 2247 | set_nobuild('\0', "clang-opt", true); |
| 2248 | # undef set_nobuild |
| 2249 | #endif |
| 2250 | |
| 2251 | #ifndef HAVE_BPF_PROLOGUE |
| 2252 | # if !defined (HAVE_DWARF_SUPPORT) |
| 2253 | # define REASON "NO_DWARF=1" |
| 2254 | # elif !defined (HAVE_LIBBPF_SUPPORT) |
| 2255 | # define REASON "NO_LIBBPF=1" |
| 2256 | # else |
| 2257 | # define REASON "this architecture doesn't support BPF prologue" |
| 2258 | # endif |
| 2259 | # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c) |
| 2260 | set_nobuild('\0', "vmlinux", true); |
| 2261 | # undef set_nobuild |
| 2262 | # undef REASON |
| 2263 | #endif |
| 2264 | |
| 2265 | CPU_ZERO(&rec->affinity_mask); |
| 2266 | rec->opts.affinity = PERF_AFFINITY_SYS; |
| 2267 | |
| 2268 | rec->evlist = perf_evlist__new(); |
| 2269 | if (rec->evlist == NULL) |
| 2270 | return -ENOMEM; |
| 2271 | |
| 2272 | err = perf_config(perf_record_config, rec); |
| 2273 | if (err) |
| 2274 | return err; |
| 2275 | |
| 2276 | argc = parse_options(argc, argv, record_options, record_usage, |
| 2277 | PARSE_OPT_STOP_AT_NON_OPTION); |
| 2278 | if (quiet) |
| 2279 | perf_quiet_option(); |
| 2280 | |
| 2281 | /* Make system wide (-a) the default target. */ |
| 2282 | if (!argc && target__none(&rec->opts.target)) |
| 2283 | rec->opts.target.system_wide = true; |
| 2284 | |
| 2285 | if (nr_cgroups && !rec->opts.target.system_wide) { |
| 2286 | usage_with_options_msg(record_usage, record_options, |
| 2287 | "cgroup monitoring only available in system-wide mode"); |
| 2288 | |
| 2289 | } |
| 2290 | |
| 2291 | if (rec->opts.comp_level != 0) { |
| 2292 | pr_debug("Compression enabled, disabling build id collection at the end of the session.\n"); |
| 2293 | rec->no_buildid = true; |
| 2294 | } |
| 2295 | |
| 2296 | if (rec->opts.record_switch_events && |
| 2297 | !perf_can_record_switch_events()) { |
| 2298 | ui__error("kernel does not support recording context switch events\n"); |
| 2299 | parse_options_usage(record_usage, record_options, "switch-events", 0); |
| 2300 | return -EINVAL; |
| 2301 | } |
| 2302 | |
| 2303 | if (switch_output_setup(rec)) { |
| 2304 | parse_options_usage(record_usage, record_options, "switch-output", 0); |
| 2305 | return -EINVAL; |
| 2306 | } |
| 2307 | |
| 2308 | if (rec->switch_output.time) { |
| 2309 | signal(SIGALRM, alarm_sig_handler); |
| 2310 | alarm(rec->switch_output.time); |
| 2311 | } |
| 2312 | |
| 2313 | if (rec->switch_output.num_files) { |
| 2314 | rec->switch_output.filenames = calloc(sizeof(char *), |
| 2315 | rec->switch_output.num_files); |
| 2316 | if (!rec->switch_output.filenames) |
| 2317 | return -EINVAL; |
| 2318 | } |
| 2319 | |
| 2320 | /* |
| 2321 | * Allow aliases to facilitate the lookup of symbols for address |
| 2322 | * filters. Refer to auxtrace_parse_filters(). |
| 2323 | */ |
| 2324 | symbol_conf.allow_aliases = true; |
| 2325 | |
| 2326 | symbol__init(NULL); |
| 2327 | |
| 2328 | err = record__auxtrace_init(rec); |
| 2329 | if (err) |
| 2330 | goto out; |
| 2331 | |
| 2332 | if (dry_run) |
| 2333 | goto out; |
| 2334 | |
| 2335 | err = bpf__setup_stdout(rec->evlist); |
| 2336 | if (err) { |
| 2337 | bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf)); |
| 2338 | pr_err("ERROR: Setup BPF stdout failed: %s\n", |
| 2339 | errbuf); |
| 2340 | goto out; |
| 2341 | } |
| 2342 | |
| 2343 | err = -ENOMEM; |
| 2344 | |
| 2345 | if (symbol_conf.kptr_restrict && !perf_evlist__exclude_kernel(rec->evlist)) |
| 2346 | pr_warning( |
| 2347 | "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n" |
| 2348 | "check /proc/sys/kernel/kptr_restrict.\n\n" |
| 2349 | "Samples in kernel functions may not be resolved if a suitable vmlinux\n" |
| 2350 | "file is not found in the buildid cache or in the vmlinux path.\n\n" |
| 2351 | "Samples in kernel modules won't be resolved at all.\n\n" |
| 2352 | "If some relocation was applied (e.g. kexec) symbols may be misresolved\n" |
| 2353 | "even with a suitable vmlinux or kallsyms file.\n\n"); |
| 2354 | |
| 2355 | if (rec->no_buildid_cache || rec->no_buildid) { |
| 2356 | disable_buildid_cache(); |
| 2357 | } else if (rec->switch_output.enabled) { |
| 2358 | /* |
| 2359 | * In 'perf record --switch-output', disable buildid |
| 2360 | * generation by default to reduce data file switching |
| 2361 | * overhead. Still generate buildid if they are required |
| 2362 | * explicitly using |
| 2363 | * |
| 2364 | * perf record --switch-output --no-no-buildid \ |
| 2365 | * --no-no-buildid-cache |
| 2366 | * |
| 2367 | * Following code equals to: |
| 2368 | * |
| 2369 | * if ((rec->no_buildid || !rec->no_buildid_set) && |
| 2370 | * (rec->no_buildid_cache || !rec->no_buildid_cache_set)) |
| 2371 | * disable_buildid_cache(); |
| 2372 | */ |
| 2373 | bool disable = true; |
| 2374 | |
| 2375 | if (rec->no_buildid_set && !rec->no_buildid) |
| 2376 | disable = false; |
| 2377 | if (rec->no_buildid_cache_set && !rec->no_buildid_cache) |
| 2378 | disable = false; |
| 2379 | if (disable) { |
| 2380 | rec->no_buildid = true; |
| 2381 | rec->no_buildid_cache = true; |
| 2382 | disable_buildid_cache(); |
| 2383 | } |
| 2384 | } |
| 2385 | |
| 2386 | if (record.opts.overwrite) |
| 2387 | record.opts.tail_synthesize = true; |
| 2388 | |
| 2389 | if (rec->evlist->nr_entries == 0 && |
| 2390 | __perf_evlist__add_default(rec->evlist, !record.opts.no_samples) < 0) { |
| 2391 | pr_err("Not enough memory for event selector list\n"); |
| 2392 | goto out; |
| 2393 | } |
| 2394 | |
| 2395 | if (rec->opts.target.tid && !rec->opts.no_inherit_set) |
| 2396 | rec->opts.no_inherit = true; |
| 2397 | |
| 2398 | err = target__validate(&rec->opts.target); |
| 2399 | if (err) { |
| 2400 | target__strerror(&rec->opts.target, err, errbuf, BUFSIZ); |
| 2401 | ui__warning("%s\n", errbuf); |
| 2402 | } |
| 2403 | |
| 2404 | err = target__parse_uid(&rec->opts.target); |
| 2405 | if (err) { |
| 2406 | int saved_errno = errno; |
| 2407 | |
| 2408 | target__strerror(&rec->opts.target, err, errbuf, BUFSIZ); |
| 2409 | ui__error("%s", errbuf); |
| 2410 | |
| 2411 | err = -saved_errno; |
| 2412 | goto out; |
| 2413 | } |
| 2414 | |
| 2415 | /* Enable ignoring missing threads when -u/-p option is defined. */ |
| 2416 | rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid; |
| 2417 | |
| 2418 | err = -ENOMEM; |
| 2419 | if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0) |
| 2420 | usage_with_options(record_usage, record_options); |
| 2421 | |
| 2422 | err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts); |
| 2423 | if (err) |
| 2424 | goto out; |
| 2425 | |
| 2426 | /* |
| 2427 | * We take all buildids when the file contains |
| 2428 | * AUX area tracing data because we do not decode the |
| 2429 | * trace because it would take too long. |
| 2430 | */ |
| 2431 | if (rec->opts.full_auxtrace) |
| 2432 | rec->buildid_all = true; |
| 2433 | |
| 2434 | if (record_opts__config(&rec->opts)) { |
| 2435 | err = -EINVAL; |
| 2436 | goto out; |
| 2437 | } |
| 2438 | |
| 2439 | if (rec->opts.nr_cblocks > nr_cblocks_max) |
| 2440 | rec->opts.nr_cblocks = nr_cblocks_max; |
| 2441 | pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks); |
| 2442 | |
| 2443 | pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]); |
| 2444 | pr_debug("mmap flush: %d\n", rec->opts.mmap_flush); |
| 2445 | |
| 2446 | if (rec->opts.comp_level > comp_level_max) |
| 2447 | rec->opts.comp_level = comp_level_max; |
| 2448 | pr_debug("comp level: %d\n", rec->opts.comp_level); |
| 2449 | |
| 2450 | err = __cmd_record(&record, argc, argv); |
| 2451 | out: |
| 2452 | perf_evlist__delete(rec->evlist); |
| 2453 | symbol__exit(); |
| 2454 | auxtrace_record__free(rec->itr); |
| 2455 | return err; |
| 2456 | } |
| 2457 | |
| 2458 | static void snapshot_sig_handler(int sig __maybe_unused) |
| 2459 | { |
| 2460 | struct record *rec = &record; |
| 2461 | |
| 2462 | if (trigger_is_ready(&auxtrace_snapshot_trigger)) { |
| 2463 | trigger_hit(&auxtrace_snapshot_trigger); |
| 2464 | auxtrace_record__snapshot_started = 1; |
| 2465 | if (auxtrace_record__snapshot_start(record.itr)) |
| 2466 | trigger_error(&auxtrace_snapshot_trigger); |
| 2467 | } |
| 2468 | |
| 2469 | if (switch_output_signal(rec)) |
| 2470 | trigger_hit(&switch_output_trigger); |
| 2471 | } |
| 2472 | |
| 2473 | static void alarm_sig_handler(int sig __maybe_unused) |
| 2474 | { |
| 2475 | struct record *rec = &record; |
| 2476 | |
| 2477 | if (switch_output_time(rec)) |
| 2478 | trigger_hit(&switch_output_trigger); |
| 2479 | } |