1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include "util/cgroup.h" 4 #include "util/data.h" 5 #include "util/debug.h" 6 #include "util/dso.h" 7 #include "util/event.h" 8 #include "util/evlist.h" 9 #include "util/machine.h" 10 #include "util/map.h" 11 #include "util/map_symbol.h" 12 #include "util/branch.h" 13 #include "util/memswap.h" 14 #include "util/namespaces.h" 15 #include "util/session.h" 16 #include "util/stat.h" 17 #include "util/symbol.h" 18 #include "util/synthetic-events.h" 19 #include "util/target.h" 20 #include "util/time-utils.h" 21 #include <linux/bitops.h> 22 #include <linux/kernel.h> 23 #include <linux/string.h> 24 #include <linux/zalloc.h> 25 #include <linux/perf_event.h> 26 #include <asm/bug.h> 27 #include <perf/evsel.h> 28 #include <perf/cpumap.h> 29 #include <internal/lib.h> // page_size 30 #include <internal/threadmap.h> 31 #include <perf/threadmap.h> 32 #include <symbol/kallsyms.h> 33 #include <dirent.h> 34 #include <errno.h> 35 #include <inttypes.h> 36 #include <stdio.h> 37 #include <string.h> 38 #include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */ 39 #include <api/fs/fs.h> 40 #include <api/io.h> 41 #include <sys/types.h> 42 #include <sys/stat.h> 43 #include <fcntl.h> 44 #include <unistd.h> 45 46 #define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500 47 48 unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT; 49 50 int perf_tool__process_synth_event(struct perf_tool *tool, 51 union perf_event *event, 52 struct machine *machine, 53 perf_event__handler_t process) 54 { 55 struct perf_sample synth_sample = { 56 .pid = -1, 57 .tid = -1, 58 .time = -1, 59 .stream_id = -1, 60 .cpu = -1, 61 .period = 1, 62 .cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK, 63 }; 64 65 return process(tool, event, &synth_sample, machine); 66 }; 67 68 /* 69 * Assumes that the first 4095 bytes of /proc/pid/stat contains 70 * the comm, tgid and ppid. 71 */ 72 static int perf_event__get_comm_ids(pid_t pid, pid_t tid, char *comm, size_t len, 73 pid_t *tgid, pid_t *ppid, bool *kernel) 74 { 75 char bf[4096]; 76 int fd; 77 size_t size = 0; 78 ssize_t n; 79 char *name, *tgids, *ppids, *vmpeak, *threads; 80 81 *tgid = -1; 82 *ppid = -1; 83 84 if (pid) 85 snprintf(bf, sizeof(bf), "/proc/%d/task/%d/status", pid, tid); 86 else 87 snprintf(bf, sizeof(bf), "/proc/%d/status", tid); 88 89 fd = open(bf, O_RDONLY); 90 if (fd < 0) { 91 pr_debug("couldn't open %s\n", bf); 92 return -1; 93 } 94 95 n = read(fd, bf, sizeof(bf) - 1); 96 close(fd); 97 if (n <= 0) { 98 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n", 99 tid); 100 return -1; 101 } 102 bf[n] = '\0'; 103 104 name = strstr(bf, "Name:"); 105 tgids = strstr(name ?: bf, "Tgid:"); 106 ppids = strstr(tgids ?: bf, "PPid:"); 107 vmpeak = strstr(ppids ?: bf, "VmPeak:"); 108 109 if (vmpeak) 110 threads = NULL; 111 else 112 threads = strstr(ppids ?: bf, "Threads:"); 113 114 if (name) { 115 char *nl; 116 117 name = skip_spaces(name + 5); /* strlen("Name:") */ 118 nl = strchr(name, '\n'); 119 if (nl) 120 *nl = '\0'; 121 122 size = strlen(name); 123 if (size >= len) 124 size = len - 1; 125 memcpy(comm, name, size); 126 comm[size] = '\0'; 127 } else { 128 pr_debug("Name: string not found for pid %d\n", tid); 129 } 130 131 if (tgids) { 132 tgids += 5; /* strlen("Tgid:") */ 133 *tgid = atoi(tgids); 134 } else { 135 pr_debug("Tgid: string not found for pid %d\n", tid); 136 } 137 138 if (ppids) { 139 ppids += 5; /* strlen("PPid:") */ 140 *ppid = atoi(ppids); 141 } else { 142 pr_debug("PPid: string not found for pid %d\n", tid); 143 } 144 145 if (!vmpeak && threads) 146 *kernel = true; 147 else 148 *kernel = false; 149 150 return 0; 151 } 152 153 static int perf_event__prepare_comm(union perf_event *event, pid_t pid, pid_t tid, 154 struct machine *machine, 155 pid_t *tgid, pid_t *ppid, bool *kernel) 156 { 157 size_t size; 158 159 *ppid = -1; 160 161 memset(&event->comm, 0, sizeof(event->comm)); 162 163 if (machine__is_host(machine)) { 164 if (perf_event__get_comm_ids(pid, tid, event->comm.comm, 165 sizeof(event->comm.comm), 166 tgid, ppid, kernel) != 0) { 167 return -1; 168 } 169 } else { 170 *tgid = machine->pid; 171 } 172 173 if (*tgid < 0) 174 return -1; 175 176 event->comm.pid = *tgid; 177 event->comm.header.type = PERF_RECORD_COMM; 178 179 size = strlen(event->comm.comm) + 1; 180 size = PERF_ALIGN(size, sizeof(u64)); 181 memset(event->comm.comm + size, 0, machine->id_hdr_size); 182 event->comm.header.size = (sizeof(event->comm) - 183 (sizeof(event->comm.comm) - size) + 184 machine->id_hdr_size); 185 event->comm.tid = tid; 186 187 return 0; 188 } 189 190 pid_t perf_event__synthesize_comm(struct perf_tool *tool, 191 union perf_event *event, pid_t pid, 192 perf_event__handler_t process, 193 struct machine *machine) 194 { 195 pid_t tgid, ppid; 196 bool kernel_thread; 197 198 if (perf_event__prepare_comm(event, 0, pid, machine, &tgid, &ppid, 199 &kernel_thread) != 0) 200 return -1; 201 202 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) 203 return -1; 204 205 return tgid; 206 } 207 208 static void perf_event__get_ns_link_info(pid_t pid, const char *ns, 209 struct perf_ns_link_info *ns_link_info) 210 { 211 struct stat64 st; 212 char proc_ns[128]; 213 214 sprintf(proc_ns, "/proc/%u/ns/%s", pid, ns); 215 if (stat64(proc_ns, &st) == 0) { 216 ns_link_info->dev = st.st_dev; 217 ns_link_info->ino = st.st_ino; 218 } 219 } 220 221 int perf_event__synthesize_namespaces(struct perf_tool *tool, 222 union perf_event *event, 223 pid_t pid, pid_t tgid, 224 perf_event__handler_t process, 225 struct machine *machine) 226 { 227 u32 idx; 228 struct perf_ns_link_info *ns_link_info; 229 230 if (!tool || !tool->namespace_events) 231 return 0; 232 233 memset(&event->namespaces, 0, (sizeof(event->namespaces) + 234 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 235 machine->id_hdr_size)); 236 237 event->namespaces.pid = tgid; 238 event->namespaces.tid = pid; 239 240 event->namespaces.nr_namespaces = NR_NAMESPACES; 241 242 ns_link_info = event->namespaces.link_info; 243 244 for (idx = 0; idx < event->namespaces.nr_namespaces; idx++) 245 perf_event__get_ns_link_info(pid, perf_ns__name(idx), 246 &ns_link_info[idx]); 247 248 event->namespaces.header.type = PERF_RECORD_NAMESPACES; 249 250 event->namespaces.header.size = (sizeof(event->namespaces) + 251 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 252 machine->id_hdr_size); 253 254 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) 255 return -1; 256 257 return 0; 258 } 259 260 static int perf_event__synthesize_fork(struct perf_tool *tool, 261 union perf_event *event, 262 pid_t pid, pid_t tgid, pid_t ppid, 263 perf_event__handler_t process, 264 struct machine *machine) 265 { 266 memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size); 267 268 /* 269 * for main thread set parent to ppid from status file. For other 270 * threads set parent pid to main thread. ie., assume main thread 271 * spawns all threads in a process 272 */ 273 if (tgid == pid) { 274 event->fork.ppid = ppid; 275 event->fork.ptid = ppid; 276 } else { 277 event->fork.ppid = tgid; 278 event->fork.ptid = tgid; 279 } 280 event->fork.pid = tgid; 281 event->fork.tid = pid; 282 event->fork.header.type = PERF_RECORD_FORK; 283 event->fork.header.misc = PERF_RECORD_MISC_FORK_EXEC; 284 285 event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size); 286 287 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) 288 return -1; 289 290 return 0; 291 } 292 293 static bool read_proc_maps_line(struct io *io, __u64 *start, __u64 *end, 294 u32 *prot, u32 *flags, __u64 *offset, 295 u32 *maj, u32 *min, 296 __u64 *inode, 297 ssize_t pathname_size, char *pathname) 298 { 299 __u64 temp; 300 int ch; 301 char *start_pathname = pathname; 302 303 if (io__get_hex(io, start) != '-') 304 return false; 305 if (io__get_hex(io, end) != ' ') 306 return false; 307 308 /* map protection and flags bits */ 309 *prot = 0; 310 ch = io__get_char(io); 311 if (ch == 'r') 312 *prot |= PROT_READ; 313 else if (ch != '-') 314 return false; 315 ch = io__get_char(io); 316 if (ch == 'w') 317 *prot |= PROT_WRITE; 318 else if (ch != '-') 319 return false; 320 ch = io__get_char(io); 321 if (ch == 'x') 322 *prot |= PROT_EXEC; 323 else if (ch != '-') 324 return false; 325 ch = io__get_char(io); 326 if (ch == 's') 327 *flags = MAP_SHARED; 328 else if (ch == 'p') 329 *flags = MAP_PRIVATE; 330 else 331 return false; 332 if (io__get_char(io) != ' ') 333 return false; 334 335 if (io__get_hex(io, offset) != ' ') 336 return false; 337 338 if (io__get_hex(io, &temp) != ':') 339 return false; 340 *maj = temp; 341 if (io__get_hex(io, &temp) != ' ') 342 return false; 343 *min = temp; 344 345 ch = io__get_dec(io, inode); 346 if (ch != ' ') { 347 *pathname = '\0'; 348 return ch == '\n'; 349 } 350 do { 351 ch = io__get_char(io); 352 } while (ch == ' '); 353 while (true) { 354 if (ch < 0) 355 return false; 356 if (ch == '\0' || ch == '\n' || 357 (pathname + 1 - start_pathname) >= pathname_size) { 358 *pathname = '\0'; 359 return true; 360 } 361 *pathname++ = ch; 362 ch = io__get_char(io); 363 } 364 } 365 366 static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event, 367 bool is_kernel) 368 { 369 struct build_id bid; 370 int rc; 371 372 if (is_kernel) 373 rc = sysfs__read_build_id("/sys/kernel/notes", &bid); 374 else 375 rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1; 376 377 if (rc == 0) { 378 memcpy(event->build_id, bid.data, sizeof(bid.data)); 379 event->build_id_size = (u8) bid.size; 380 event->header.misc |= PERF_RECORD_MISC_MMAP_BUILD_ID; 381 event->__reserved_1 = 0; 382 event->__reserved_2 = 0; 383 } else { 384 if (event->filename[0] == '/') { 385 pr_debug2("Failed to read build ID for %s\n", 386 event->filename); 387 } 388 } 389 } 390 391 int perf_event__synthesize_mmap_events(struct perf_tool *tool, 392 union perf_event *event, 393 pid_t pid, pid_t tgid, 394 perf_event__handler_t process, 395 struct machine *machine, 396 bool mmap_data) 397 { 398 unsigned long long t; 399 char bf[BUFSIZ]; 400 struct io io; 401 bool truncation = false; 402 unsigned long long timeout = proc_map_timeout * 1000000ULL; 403 int rc = 0; 404 const char *hugetlbfs_mnt = hugetlbfs__mountpoint(); 405 int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0; 406 407 if (machine__is_default_guest(machine)) 408 return 0; 409 410 snprintf(bf, sizeof(bf), "%s/proc/%d/task/%d/maps", 411 machine->root_dir, pid, pid); 412 413 io.fd = open(bf, O_RDONLY, 0); 414 if (io.fd < 0) { 415 /* 416 * We raced with a task exiting - just return: 417 */ 418 pr_debug("couldn't open %s\n", bf); 419 return -1; 420 } 421 io__init(&io, io.fd, bf, sizeof(bf)); 422 423 event->header.type = PERF_RECORD_MMAP2; 424 t = rdclock(); 425 426 while (!io.eof) { 427 static const char anonstr[] = "//anon"; 428 size_t size, aligned_size; 429 430 /* ensure null termination since stack will be reused. */ 431 event->mmap2.filename[0] = '\0'; 432 433 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */ 434 if (!read_proc_maps_line(&io, 435 &event->mmap2.start, 436 &event->mmap2.len, 437 &event->mmap2.prot, 438 &event->mmap2.flags, 439 &event->mmap2.pgoff, 440 &event->mmap2.maj, 441 &event->mmap2.min, 442 &event->mmap2.ino, 443 sizeof(event->mmap2.filename), 444 event->mmap2.filename)) 445 continue; 446 447 if ((rdclock() - t) > timeout) { 448 pr_warning("Reading %s/proc/%d/task/%d/maps time out. " 449 "You may want to increase " 450 "the time limit by --proc-map-timeout\n", 451 machine->root_dir, pid, pid); 452 truncation = true; 453 goto out; 454 } 455 456 event->mmap2.ino_generation = 0; 457 458 /* 459 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c 460 */ 461 if (machine__is_host(machine)) 462 event->header.misc = PERF_RECORD_MISC_USER; 463 else 464 event->header.misc = PERF_RECORD_MISC_GUEST_USER; 465 466 if ((event->mmap2.prot & PROT_EXEC) == 0) { 467 if (!mmap_data || (event->mmap2.prot & PROT_READ) == 0) 468 continue; 469 470 event->header.misc |= PERF_RECORD_MISC_MMAP_DATA; 471 } 472 473 out: 474 if (truncation) 475 event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT; 476 477 if (!strcmp(event->mmap2.filename, "")) 478 strcpy(event->mmap2.filename, anonstr); 479 480 if (hugetlbfs_mnt_len && 481 !strncmp(event->mmap2.filename, hugetlbfs_mnt, 482 hugetlbfs_mnt_len)) { 483 strcpy(event->mmap2.filename, anonstr); 484 event->mmap2.flags |= MAP_HUGETLB; 485 } 486 487 size = strlen(event->mmap2.filename) + 1; 488 aligned_size = PERF_ALIGN(size, sizeof(u64)); 489 event->mmap2.len -= event->mmap.start; 490 event->mmap2.header.size = (sizeof(event->mmap2) - 491 (sizeof(event->mmap2.filename) - aligned_size)); 492 memset(event->mmap2.filename + size, 0, machine->id_hdr_size + 493 (aligned_size - size)); 494 event->mmap2.header.size += machine->id_hdr_size; 495 event->mmap2.pid = tgid; 496 event->mmap2.tid = pid; 497 498 if (symbol_conf.buildid_mmap2) 499 perf_record_mmap2__read_build_id(&event->mmap2, false); 500 501 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) { 502 rc = -1; 503 break; 504 } 505 506 if (truncation) 507 break; 508 } 509 510 close(io.fd); 511 return rc; 512 } 513 514 #ifdef HAVE_FILE_HANDLE 515 static int perf_event__synthesize_cgroup(struct perf_tool *tool, 516 union perf_event *event, 517 char *path, size_t mount_len, 518 perf_event__handler_t process, 519 struct machine *machine) 520 { 521 size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path); 522 size_t path_len = strlen(path) - mount_len + 1; 523 struct { 524 struct file_handle fh; 525 uint64_t cgroup_id; 526 } handle; 527 int mount_id; 528 529 while (path_len % sizeof(u64)) 530 path[mount_len + path_len++] = '\0'; 531 532 memset(&event->cgroup, 0, event_size); 533 534 event->cgroup.header.type = PERF_RECORD_CGROUP; 535 event->cgroup.header.size = event_size + path_len + machine->id_hdr_size; 536 537 handle.fh.handle_bytes = sizeof(handle.cgroup_id); 538 if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) { 539 pr_debug("stat failed: %s\n", path); 540 return -1; 541 } 542 543 event->cgroup.id = handle.cgroup_id; 544 strncpy(event->cgroup.path, path + mount_len, path_len); 545 memset(event->cgroup.path + path_len, 0, machine->id_hdr_size); 546 547 if (perf_tool__process_synth_event(tool, event, machine, process) < 0) { 548 pr_debug("process synth event failed\n"); 549 return -1; 550 } 551 552 return 0; 553 } 554 555 static int perf_event__walk_cgroup_tree(struct perf_tool *tool, 556 union perf_event *event, 557 char *path, size_t mount_len, 558 perf_event__handler_t process, 559 struct machine *machine) 560 { 561 size_t pos = strlen(path); 562 DIR *d; 563 struct dirent *dent; 564 int ret = 0; 565 566 if (perf_event__synthesize_cgroup(tool, event, path, mount_len, 567 process, machine) < 0) 568 return -1; 569 570 d = opendir(path); 571 if (d == NULL) { 572 pr_debug("failed to open directory: %s\n", path); 573 return -1; 574 } 575 576 while ((dent = readdir(d)) != NULL) { 577 if (dent->d_type != DT_DIR) 578 continue; 579 if (!strcmp(dent->d_name, ".") || 580 !strcmp(dent->d_name, "..")) 581 continue; 582 583 /* any sane path should be less than PATH_MAX */ 584 if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX) 585 continue; 586 587 if (path[pos - 1] != '/') 588 strcat(path, "/"); 589 strcat(path, dent->d_name); 590 591 ret = perf_event__walk_cgroup_tree(tool, event, path, 592 mount_len, process, machine); 593 if (ret < 0) 594 break; 595 596 path[pos] = '\0'; 597 } 598 599 closedir(d); 600 return ret; 601 } 602 603 int perf_event__synthesize_cgroups(struct perf_tool *tool, 604 perf_event__handler_t process, 605 struct machine *machine) 606 { 607 union perf_event event; 608 char cgrp_root[PATH_MAX]; 609 size_t mount_len; /* length of mount point in the path */ 610 611 if (!tool || !tool->cgroup_events) 612 return 0; 613 614 if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) { 615 pr_debug("cannot find cgroup mount point\n"); 616 return -1; 617 } 618 619 mount_len = strlen(cgrp_root); 620 /* make sure the path starts with a slash (after mount point) */ 621 strcat(cgrp_root, "/"); 622 623 if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len, 624 process, machine) < 0) 625 return -1; 626 627 return 0; 628 } 629 #else 630 int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused, 631 perf_event__handler_t process __maybe_unused, 632 struct machine *machine __maybe_unused) 633 { 634 return -1; 635 } 636 #endif 637 638 int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process, 639 struct machine *machine) 640 { 641 int rc = 0; 642 struct map *pos; 643 struct maps *maps = machine__kernel_maps(machine); 644 union perf_event *event; 645 size_t size = symbol_conf.buildid_mmap2 ? 646 sizeof(event->mmap2) : sizeof(event->mmap); 647 648 event = zalloc(size + machine->id_hdr_size); 649 if (event == NULL) { 650 pr_debug("Not enough memory synthesizing mmap event " 651 "for kernel modules\n"); 652 return -1; 653 } 654 655 /* 656 * kernel uses 0 for user space maps, see kernel/perf_event.c 657 * __perf_event_mmap 658 */ 659 if (machine__is_host(machine)) 660 event->header.misc = PERF_RECORD_MISC_KERNEL; 661 else 662 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; 663 664 maps__for_each_entry(maps, pos) { 665 if (!__map__is_kmodule(pos)) 666 continue; 667 668 if (symbol_conf.buildid_mmap2) { 669 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64)); 670 event->mmap2.header.type = PERF_RECORD_MMAP2; 671 event->mmap2.header.size = (sizeof(event->mmap2) - 672 (sizeof(event->mmap2.filename) - size)); 673 memset(event->mmap2.filename + size, 0, machine->id_hdr_size); 674 event->mmap2.header.size += machine->id_hdr_size; 675 event->mmap2.start = pos->start; 676 event->mmap2.len = pos->end - pos->start; 677 event->mmap2.pid = machine->pid; 678 679 memcpy(event->mmap2.filename, pos->dso->long_name, 680 pos->dso->long_name_len + 1); 681 682 perf_record_mmap2__read_build_id(&event->mmap2, false); 683 } else { 684 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64)); 685 event->mmap.header.type = PERF_RECORD_MMAP; 686 event->mmap.header.size = (sizeof(event->mmap) - 687 (sizeof(event->mmap.filename) - size)); 688 memset(event->mmap.filename + size, 0, machine->id_hdr_size); 689 event->mmap.header.size += machine->id_hdr_size; 690 event->mmap.start = pos->start; 691 event->mmap.len = pos->end - pos->start; 692 event->mmap.pid = machine->pid; 693 694 memcpy(event->mmap.filename, pos->dso->long_name, 695 pos->dso->long_name_len + 1); 696 } 697 698 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) { 699 rc = -1; 700 break; 701 } 702 } 703 704 free(event); 705 return rc; 706 } 707 708 static int filter_task(const struct dirent *dirent) 709 { 710 return isdigit(dirent->d_name[0]); 711 } 712 713 static int __event__synthesize_thread(union perf_event *comm_event, 714 union perf_event *mmap_event, 715 union perf_event *fork_event, 716 union perf_event *namespaces_event, 717 pid_t pid, int full, perf_event__handler_t process, 718 struct perf_tool *tool, struct machine *machine, bool mmap_data) 719 { 720 char filename[PATH_MAX]; 721 struct dirent **dirent; 722 pid_t tgid, ppid; 723 int rc = 0; 724 int i, n; 725 726 /* special case: only send one comm event using passed in pid */ 727 if (!full) { 728 tgid = perf_event__synthesize_comm(tool, comm_event, pid, 729 process, machine); 730 731 if (tgid == -1) 732 return -1; 733 734 if (perf_event__synthesize_namespaces(tool, namespaces_event, pid, 735 tgid, process, machine) < 0) 736 return -1; 737 738 /* 739 * send mmap only for thread group leader 740 * see thread__init_maps() 741 */ 742 if (pid == tgid && 743 perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid, 744 process, machine, mmap_data)) 745 return -1; 746 747 return 0; 748 } 749 750 if (machine__is_default_guest(machine)) 751 return 0; 752 753 snprintf(filename, sizeof(filename), "%s/proc/%d/task", 754 machine->root_dir, pid); 755 756 n = scandir(filename, &dirent, filter_task, alphasort); 757 if (n < 0) 758 return n; 759 760 for (i = 0; i < n; i++) { 761 char *end; 762 pid_t _pid; 763 bool kernel_thread = false; 764 765 _pid = strtol(dirent[i]->d_name, &end, 10); 766 if (*end) 767 continue; 768 769 rc = -1; 770 if (perf_event__prepare_comm(comm_event, pid, _pid, machine, 771 &tgid, &ppid, &kernel_thread) != 0) 772 break; 773 774 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid, 775 ppid, process, machine) < 0) 776 break; 777 778 if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid, 779 tgid, process, machine) < 0) 780 break; 781 782 /* 783 * Send the prepared comm event 784 */ 785 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0) 786 break; 787 788 rc = 0; 789 if (_pid == pid && !kernel_thread) { 790 /* process the parent's maps too */ 791 rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid, 792 process, machine, mmap_data); 793 if (rc) 794 break; 795 } 796 } 797 798 for (i = 0; i < n; i++) 799 zfree(&dirent[i]); 800 free(dirent); 801 802 return rc; 803 } 804 805 int perf_event__synthesize_thread_map(struct perf_tool *tool, 806 struct perf_thread_map *threads, 807 perf_event__handler_t process, 808 struct machine *machine, 809 bool mmap_data) 810 { 811 union perf_event *comm_event, *mmap_event, *fork_event; 812 union perf_event *namespaces_event; 813 int err = -1, thread, j; 814 815 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size); 816 if (comm_event == NULL) 817 goto out; 818 819 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size); 820 if (mmap_event == NULL) 821 goto out_free_comm; 822 823 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size); 824 if (fork_event == NULL) 825 goto out_free_mmap; 826 827 namespaces_event = malloc(sizeof(namespaces_event->namespaces) + 828 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 829 machine->id_hdr_size); 830 if (namespaces_event == NULL) 831 goto out_free_fork; 832 833 err = 0; 834 for (thread = 0; thread < threads->nr; ++thread) { 835 if (__event__synthesize_thread(comm_event, mmap_event, 836 fork_event, namespaces_event, 837 perf_thread_map__pid(threads, thread), 0, 838 process, tool, machine, 839 mmap_data)) { 840 err = -1; 841 break; 842 } 843 844 /* 845 * comm.pid is set to thread group id by 846 * perf_event__synthesize_comm 847 */ 848 if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) { 849 bool need_leader = true; 850 851 /* is thread group leader in thread_map? */ 852 for (j = 0; j < threads->nr; ++j) { 853 if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) { 854 need_leader = false; 855 break; 856 } 857 } 858 859 /* if not, generate events for it */ 860 if (need_leader && 861 __event__synthesize_thread(comm_event, mmap_event, 862 fork_event, namespaces_event, 863 comm_event->comm.pid, 0, 864 process, tool, machine, 865 mmap_data)) { 866 err = -1; 867 break; 868 } 869 } 870 } 871 free(namespaces_event); 872 out_free_fork: 873 free(fork_event); 874 out_free_mmap: 875 free(mmap_event); 876 out_free_comm: 877 free(comm_event); 878 out: 879 return err; 880 } 881 882 static int __perf_event__synthesize_threads(struct perf_tool *tool, 883 perf_event__handler_t process, 884 struct machine *machine, 885 bool mmap_data, 886 struct dirent **dirent, 887 int start, 888 int num) 889 { 890 union perf_event *comm_event, *mmap_event, *fork_event; 891 union perf_event *namespaces_event; 892 int err = -1; 893 char *end; 894 pid_t pid; 895 int i; 896 897 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size); 898 if (comm_event == NULL) 899 goto out; 900 901 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size); 902 if (mmap_event == NULL) 903 goto out_free_comm; 904 905 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size); 906 if (fork_event == NULL) 907 goto out_free_mmap; 908 909 namespaces_event = malloc(sizeof(namespaces_event->namespaces) + 910 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 911 machine->id_hdr_size); 912 if (namespaces_event == NULL) 913 goto out_free_fork; 914 915 for (i = start; i < start + num; i++) { 916 if (!isdigit(dirent[i]->d_name[0])) 917 continue; 918 919 pid = (pid_t)strtol(dirent[i]->d_name, &end, 10); 920 /* only interested in proper numerical dirents */ 921 if (*end) 922 continue; 923 /* 924 * We may race with exiting thread, so don't stop just because 925 * one thread couldn't be synthesized. 926 */ 927 __event__synthesize_thread(comm_event, mmap_event, fork_event, 928 namespaces_event, pid, 1, process, 929 tool, machine, mmap_data); 930 } 931 err = 0; 932 933 free(namespaces_event); 934 out_free_fork: 935 free(fork_event); 936 out_free_mmap: 937 free(mmap_event); 938 out_free_comm: 939 free(comm_event); 940 out: 941 return err; 942 } 943 944 struct synthesize_threads_arg { 945 struct perf_tool *tool; 946 perf_event__handler_t process; 947 struct machine *machine; 948 bool mmap_data; 949 struct dirent **dirent; 950 int num; 951 int start; 952 }; 953 954 static void *synthesize_threads_worker(void *arg) 955 { 956 struct synthesize_threads_arg *args = arg; 957 958 __perf_event__synthesize_threads(args->tool, args->process, 959 args->machine, args->mmap_data, 960 args->dirent, 961 args->start, args->num); 962 return NULL; 963 } 964 965 int perf_event__synthesize_threads(struct perf_tool *tool, 966 perf_event__handler_t process, 967 struct machine *machine, 968 bool mmap_data, 969 unsigned int nr_threads_synthesize) 970 { 971 struct synthesize_threads_arg *args = NULL; 972 pthread_t *synthesize_threads = NULL; 973 char proc_path[PATH_MAX]; 974 struct dirent **dirent; 975 int num_per_thread; 976 int m, n, i, j; 977 int thread_nr; 978 int base = 0; 979 int err = -1; 980 981 982 if (machine__is_default_guest(machine)) 983 return 0; 984 985 snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir); 986 n = scandir(proc_path, &dirent, filter_task, alphasort); 987 if (n < 0) 988 return err; 989 990 if (nr_threads_synthesize == UINT_MAX) 991 thread_nr = sysconf(_SC_NPROCESSORS_ONLN); 992 else 993 thread_nr = nr_threads_synthesize; 994 995 if (thread_nr <= 1) { 996 err = __perf_event__synthesize_threads(tool, process, 997 machine, mmap_data, 998 dirent, base, n); 999 goto free_dirent; 1000 } 1001 if (thread_nr > n) 1002 thread_nr = n; 1003 1004 synthesize_threads = calloc(sizeof(pthread_t), thread_nr); 1005 if (synthesize_threads == NULL) 1006 goto free_dirent; 1007 1008 args = calloc(sizeof(*args), thread_nr); 1009 if (args == NULL) 1010 goto free_threads; 1011 1012 num_per_thread = n / thread_nr; 1013 m = n % thread_nr; 1014 for (i = 0; i < thread_nr; i++) { 1015 args[i].tool = tool; 1016 args[i].process = process; 1017 args[i].machine = machine; 1018 args[i].mmap_data = mmap_data; 1019 args[i].dirent = dirent; 1020 } 1021 for (i = 0; i < m; i++) { 1022 args[i].num = num_per_thread + 1; 1023 args[i].start = i * args[i].num; 1024 } 1025 if (i != 0) 1026 base = args[i-1].start + args[i-1].num; 1027 for (j = i; j < thread_nr; j++) { 1028 args[j].num = num_per_thread; 1029 args[j].start = base + (j - i) * args[i].num; 1030 } 1031 1032 for (i = 0; i < thread_nr; i++) { 1033 if (pthread_create(&synthesize_threads[i], NULL, 1034 synthesize_threads_worker, &args[i])) 1035 goto out_join; 1036 } 1037 err = 0; 1038 out_join: 1039 for (i = 0; i < thread_nr; i++) 1040 pthread_join(synthesize_threads[i], NULL); 1041 free(args); 1042 free_threads: 1043 free(synthesize_threads); 1044 free_dirent: 1045 for (i = 0; i < n; i++) 1046 zfree(&dirent[i]); 1047 free(dirent); 1048 1049 return err; 1050 } 1051 1052 int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused, 1053 perf_event__handler_t process __maybe_unused, 1054 struct machine *machine __maybe_unused) 1055 { 1056 return 0; 1057 } 1058 1059 static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool, 1060 perf_event__handler_t process, 1061 struct machine *machine) 1062 { 1063 union perf_event *event; 1064 size_t size = symbol_conf.buildid_mmap2 ? 1065 sizeof(event->mmap2) : sizeof(event->mmap); 1066 struct map *map = machine__kernel_map(machine); 1067 struct kmap *kmap; 1068 int err; 1069 1070 if (map == NULL) 1071 return -1; 1072 1073 kmap = map__kmap(map); 1074 if (!kmap->ref_reloc_sym) 1075 return -1; 1076 1077 /* 1078 * We should get this from /sys/kernel/sections/.text, but till that is 1079 * available use this, and after it is use this as a fallback for older 1080 * kernels. 1081 */ 1082 event = zalloc(size + machine->id_hdr_size); 1083 if (event == NULL) { 1084 pr_debug("Not enough memory synthesizing mmap event " 1085 "for kernel modules\n"); 1086 return -1; 1087 } 1088 1089 if (machine__is_host(machine)) { 1090 /* 1091 * kernel uses PERF_RECORD_MISC_USER for user space maps, 1092 * see kernel/perf_event.c __perf_event_mmap 1093 */ 1094 event->header.misc = PERF_RECORD_MISC_KERNEL; 1095 } else { 1096 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; 1097 } 1098 1099 if (symbol_conf.buildid_mmap2) { 1100 size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename), 1101 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1; 1102 size = PERF_ALIGN(size, sizeof(u64)); 1103 event->mmap2.header.type = PERF_RECORD_MMAP2; 1104 event->mmap2.header.size = (sizeof(event->mmap2) - 1105 (sizeof(event->mmap2.filename) - size) + machine->id_hdr_size); 1106 event->mmap2.pgoff = kmap->ref_reloc_sym->addr; 1107 event->mmap2.start = map->start; 1108 event->mmap2.len = map->end - event->mmap.start; 1109 event->mmap2.pid = machine->pid; 1110 1111 perf_record_mmap2__read_build_id(&event->mmap2, true); 1112 } else { 1113 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename), 1114 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1; 1115 size = PERF_ALIGN(size, sizeof(u64)); 1116 event->mmap.header.type = PERF_RECORD_MMAP; 1117 event->mmap.header.size = (sizeof(event->mmap) - 1118 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size); 1119 event->mmap.pgoff = kmap->ref_reloc_sym->addr; 1120 event->mmap.start = map->start; 1121 event->mmap.len = map->end - event->mmap.start; 1122 event->mmap.pid = machine->pid; 1123 } 1124 1125 err = perf_tool__process_synth_event(tool, event, machine, process); 1126 free(event); 1127 1128 return err; 1129 } 1130 1131 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool, 1132 perf_event__handler_t process, 1133 struct machine *machine) 1134 { 1135 int err; 1136 1137 err = __perf_event__synthesize_kernel_mmap(tool, process, machine); 1138 if (err < 0) 1139 return err; 1140 1141 return perf_event__synthesize_extra_kmaps(tool, process, machine); 1142 } 1143 1144 int perf_event__synthesize_thread_map2(struct perf_tool *tool, 1145 struct perf_thread_map *threads, 1146 perf_event__handler_t process, 1147 struct machine *machine) 1148 { 1149 union perf_event *event; 1150 int i, err, size; 1151 1152 size = sizeof(event->thread_map); 1153 size += threads->nr * sizeof(event->thread_map.entries[0]); 1154 1155 event = zalloc(size); 1156 if (!event) 1157 return -ENOMEM; 1158 1159 event->header.type = PERF_RECORD_THREAD_MAP; 1160 event->header.size = size; 1161 event->thread_map.nr = threads->nr; 1162 1163 for (i = 0; i < threads->nr; i++) { 1164 struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i]; 1165 char *comm = perf_thread_map__comm(threads, i); 1166 1167 if (!comm) 1168 comm = (char *) ""; 1169 1170 entry->pid = perf_thread_map__pid(threads, i); 1171 strncpy((char *) &entry->comm, comm, sizeof(entry->comm)); 1172 } 1173 1174 err = process(tool, event, NULL, machine); 1175 1176 free(event); 1177 return err; 1178 } 1179 1180 static void synthesize_cpus(struct cpu_map_entries *cpus, 1181 struct perf_cpu_map *map) 1182 { 1183 int i; 1184 1185 cpus->nr = map->nr; 1186 1187 for (i = 0; i < map->nr; i++) 1188 cpus->cpu[i] = map->map[i]; 1189 } 1190 1191 static void synthesize_mask(struct perf_record_record_cpu_map *mask, 1192 struct perf_cpu_map *map, int max) 1193 { 1194 int i; 1195 1196 mask->nr = BITS_TO_LONGS(max); 1197 mask->long_size = sizeof(long); 1198 1199 for (i = 0; i < map->nr; i++) 1200 set_bit(map->map[i], mask->mask); 1201 } 1202 1203 static size_t cpus_size(struct perf_cpu_map *map) 1204 { 1205 return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16); 1206 } 1207 1208 static size_t mask_size(struct perf_cpu_map *map, int *max) 1209 { 1210 int i; 1211 1212 *max = 0; 1213 1214 for (i = 0; i < map->nr; i++) { 1215 /* bit position of the cpu is + 1 */ 1216 int bit = map->map[i] + 1; 1217 1218 if (bit > *max) 1219 *max = bit; 1220 } 1221 1222 return sizeof(struct perf_record_record_cpu_map) + BITS_TO_LONGS(*max) * sizeof(long); 1223 } 1224 1225 void *cpu_map_data__alloc(struct perf_cpu_map *map, size_t *size, u16 *type, int *max) 1226 { 1227 size_t size_cpus, size_mask; 1228 bool is_dummy = perf_cpu_map__empty(map); 1229 1230 /* 1231 * Both array and mask data have variable size based 1232 * on the number of cpus and their actual values. 1233 * The size of the 'struct perf_record_cpu_map_data' is: 1234 * 1235 * array = size of 'struct cpu_map_entries' + 1236 * number of cpus * sizeof(u64) 1237 * 1238 * mask = size of 'struct perf_record_record_cpu_map' + 1239 * maximum cpu bit converted to size of longs 1240 * 1241 * and finally + the size of 'struct perf_record_cpu_map_data'. 1242 */ 1243 size_cpus = cpus_size(map); 1244 size_mask = mask_size(map, max); 1245 1246 if (is_dummy || (size_cpus < size_mask)) { 1247 *size += size_cpus; 1248 *type = PERF_CPU_MAP__CPUS; 1249 } else { 1250 *size += size_mask; 1251 *type = PERF_CPU_MAP__MASK; 1252 } 1253 1254 *size += sizeof(struct perf_record_cpu_map_data); 1255 *size = PERF_ALIGN(*size, sizeof(u64)); 1256 return zalloc(*size); 1257 } 1258 1259 void cpu_map_data__synthesize(struct perf_record_cpu_map_data *data, struct perf_cpu_map *map, 1260 u16 type, int max) 1261 { 1262 data->type = type; 1263 1264 switch (type) { 1265 case PERF_CPU_MAP__CPUS: 1266 synthesize_cpus((struct cpu_map_entries *) data->data, map); 1267 break; 1268 case PERF_CPU_MAP__MASK: 1269 synthesize_mask((struct perf_record_record_cpu_map *)data->data, map, max); 1270 default: 1271 break; 1272 } 1273 } 1274 1275 static struct perf_record_cpu_map *cpu_map_event__new(struct perf_cpu_map *map) 1276 { 1277 size_t size = sizeof(struct perf_record_cpu_map); 1278 struct perf_record_cpu_map *event; 1279 int max; 1280 u16 type; 1281 1282 event = cpu_map_data__alloc(map, &size, &type, &max); 1283 if (!event) 1284 return NULL; 1285 1286 event->header.type = PERF_RECORD_CPU_MAP; 1287 event->header.size = size; 1288 event->data.type = type; 1289 1290 cpu_map_data__synthesize(&event->data, map, type, max); 1291 return event; 1292 } 1293 1294 int perf_event__synthesize_cpu_map(struct perf_tool *tool, 1295 struct perf_cpu_map *map, 1296 perf_event__handler_t process, 1297 struct machine *machine) 1298 { 1299 struct perf_record_cpu_map *event; 1300 int err; 1301 1302 event = cpu_map_event__new(map); 1303 if (!event) 1304 return -ENOMEM; 1305 1306 err = process(tool, (union perf_event *) event, NULL, machine); 1307 1308 free(event); 1309 return err; 1310 } 1311 1312 int perf_event__synthesize_stat_config(struct perf_tool *tool, 1313 struct perf_stat_config *config, 1314 perf_event__handler_t process, 1315 struct machine *machine) 1316 { 1317 struct perf_record_stat_config *event; 1318 int size, i = 0, err; 1319 1320 size = sizeof(*event); 1321 size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0])); 1322 1323 event = zalloc(size); 1324 if (!event) 1325 return -ENOMEM; 1326 1327 event->header.type = PERF_RECORD_STAT_CONFIG; 1328 event->header.size = size; 1329 event->nr = PERF_STAT_CONFIG_TERM__MAX; 1330 1331 #define ADD(__term, __val) \ 1332 event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term; \ 1333 event->data[i].val = __val; \ 1334 i++; 1335 1336 ADD(AGGR_MODE, config->aggr_mode) 1337 ADD(INTERVAL, config->interval) 1338 ADD(SCALE, config->scale) 1339 1340 WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX, 1341 "stat config terms unbalanced\n"); 1342 #undef ADD 1343 1344 err = process(tool, (union perf_event *) event, NULL, machine); 1345 1346 free(event); 1347 return err; 1348 } 1349 1350 int perf_event__synthesize_stat(struct perf_tool *tool, 1351 u32 cpu, u32 thread, u64 id, 1352 struct perf_counts_values *count, 1353 perf_event__handler_t process, 1354 struct machine *machine) 1355 { 1356 struct perf_record_stat event; 1357 1358 event.header.type = PERF_RECORD_STAT; 1359 event.header.size = sizeof(event); 1360 event.header.misc = 0; 1361 1362 event.id = id; 1363 event.cpu = cpu; 1364 event.thread = thread; 1365 event.val = count->val; 1366 event.ena = count->ena; 1367 event.run = count->run; 1368 1369 return process(tool, (union perf_event *) &event, NULL, machine); 1370 } 1371 1372 int perf_event__synthesize_stat_round(struct perf_tool *tool, 1373 u64 evtime, u64 type, 1374 perf_event__handler_t process, 1375 struct machine *machine) 1376 { 1377 struct perf_record_stat_round event; 1378 1379 event.header.type = PERF_RECORD_STAT_ROUND; 1380 event.header.size = sizeof(event); 1381 event.header.misc = 0; 1382 1383 event.time = evtime; 1384 event.type = type; 1385 1386 return process(tool, (union perf_event *) &event, NULL, machine); 1387 } 1388 1389 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format) 1390 { 1391 size_t sz, result = sizeof(struct perf_record_sample); 1392 1393 if (type & PERF_SAMPLE_IDENTIFIER) 1394 result += sizeof(u64); 1395 1396 if (type & PERF_SAMPLE_IP) 1397 result += sizeof(u64); 1398 1399 if (type & PERF_SAMPLE_TID) 1400 result += sizeof(u64); 1401 1402 if (type & PERF_SAMPLE_TIME) 1403 result += sizeof(u64); 1404 1405 if (type & PERF_SAMPLE_ADDR) 1406 result += sizeof(u64); 1407 1408 if (type & PERF_SAMPLE_ID) 1409 result += sizeof(u64); 1410 1411 if (type & PERF_SAMPLE_STREAM_ID) 1412 result += sizeof(u64); 1413 1414 if (type & PERF_SAMPLE_CPU) 1415 result += sizeof(u64); 1416 1417 if (type & PERF_SAMPLE_PERIOD) 1418 result += sizeof(u64); 1419 1420 if (type & PERF_SAMPLE_READ) { 1421 result += sizeof(u64); 1422 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1423 result += sizeof(u64); 1424 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1425 result += sizeof(u64); 1426 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1427 if (read_format & PERF_FORMAT_GROUP) { 1428 sz = sample->read.group.nr * 1429 sizeof(struct sample_read_value); 1430 result += sz; 1431 } else { 1432 result += sizeof(u64); 1433 } 1434 } 1435 1436 if (type & PERF_SAMPLE_CALLCHAIN) { 1437 sz = (sample->callchain->nr + 1) * sizeof(u64); 1438 result += sz; 1439 } 1440 1441 if (type & PERF_SAMPLE_RAW) { 1442 result += sizeof(u32); 1443 result += sample->raw_size; 1444 } 1445 1446 if (type & PERF_SAMPLE_BRANCH_STACK) { 1447 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1448 /* nr, hw_idx */ 1449 sz += 2 * sizeof(u64); 1450 result += sz; 1451 } 1452 1453 if (type & PERF_SAMPLE_REGS_USER) { 1454 if (sample->user_regs.abi) { 1455 result += sizeof(u64); 1456 sz = hweight64(sample->user_regs.mask) * sizeof(u64); 1457 result += sz; 1458 } else { 1459 result += sizeof(u64); 1460 } 1461 } 1462 1463 if (type & PERF_SAMPLE_STACK_USER) { 1464 sz = sample->user_stack.size; 1465 result += sizeof(u64); 1466 if (sz) { 1467 result += sz; 1468 result += sizeof(u64); 1469 } 1470 } 1471 1472 if (type & PERF_SAMPLE_WEIGHT_TYPE) 1473 result += sizeof(u64); 1474 1475 if (type & PERF_SAMPLE_DATA_SRC) 1476 result += sizeof(u64); 1477 1478 if (type & PERF_SAMPLE_TRANSACTION) 1479 result += sizeof(u64); 1480 1481 if (type & PERF_SAMPLE_REGS_INTR) { 1482 if (sample->intr_regs.abi) { 1483 result += sizeof(u64); 1484 sz = hweight64(sample->intr_regs.mask) * sizeof(u64); 1485 result += sz; 1486 } else { 1487 result += sizeof(u64); 1488 } 1489 } 1490 1491 if (type & PERF_SAMPLE_PHYS_ADDR) 1492 result += sizeof(u64); 1493 1494 if (type & PERF_SAMPLE_CGROUP) 1495 result += sizeof(u64); 1496 1497 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) 1498 result += sizeof(u64); 1499 1500 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) 1501 result += sizeof(u64); 1502 1503 if (type & PERF_SAMPLE_AUX) { 1504 result += sizeof(u64); 1505 result += sample->aux_sample.size; 1506 } 1507 1508 return result; 1509 } 1510 1511 void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data, 1512 __u64 *array, u64 type __maybe_unused) 1513 { 1514 *array = data->weight; 1515 } 1516 1517 int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format, 1518 const struct perf_sample *sample) 1519 { 1520 __u64 *array; 1521 size_t sz; 1522 /* 1523 * used for cross-endian analysis. See git commit 65014ab3 1524 * for why this goofiness is needed. 1525 */ 1526 union u64_swap u; 1527 1528 array = event->sample.array; 1529 1530 if (type & PERF_SAMPLE_IDENTIFIER) { 1531 *array = sample->id; 1532 array++; 1533 } 1534 1535 if (type & PERF_SAMPLE_IP) { 1536 *array = sample->ip; 1537 array++; 1538 } 1539 1540 if (type & PERF_SAMPLE_TID) { 1541 u.val32[0] = sample->pid; 1542 u.val32[1] = sample->tid; 1543 *array = u.val64; 1544 array++; 1545 } 1546 1547 if (type & PERF_SAMPLE_TIME) { 1548 *array = sample->time; 1549 array++; 1550 } 1551 1552 if (type & PERF_SAMPLE_ADDR) { 1553 *array = sample->addr; 1554 array++; 1555 } 1556 1557 if (type & PERF_SAMPLE_ID) { 1558 *array = sample->id; 1559 array++; 1560 } 1561 1562 if (type & PERF_SAMPLE_STREAM_ID) { 1563 *array = sample->stream_id; 1564 array++; 1565 } 1566 1567 if (type & PERF_SAMPLE_CPU) { 1568 u.val32[0] = sample->cpu; 1569 u.val32[1] = 0; 1570 *array = u.val64; 1571 array++; 1572 } 1573 1574 if (type & PERF_SAMPLE_PERIOD) { 1575 *array = sample->period; 1576 array++; 1577 } 1578 1579 if (type & PERF_SAMPLE_READ) { 1580 if (read_format & PERF_FORMAT_GROUP) 1581 *array = sample->read.group.nr; 1582 else 1583 *array = sample->read.one.value; 1584 array++; 1585 1586 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 1587 *array = sample->read.time_enabled; 1588 array++; 1589 } 1590 1591 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 1592 *array = sample->read.time_running; 1593 array++; 1594 } 1595 1596 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1597 if (read_format & PERF_FORMAT_GROUP) { 1598 sz = sample->read.group.nr * 1599 sizeof(struct sample_read_value); 1600 memcpy(array, sample->read.group.values, sz); 1601 array = (void *)array + sz; 1602 } else { 1603 *array = sample->read.one.id; 1604 array++; 1605 } 1606 } 1607 1608 if (type & PERF_SAMPLE_CALLCHAIN) { 1609 sz = (sample->callchain->nr + 1) * sizeof(u64); 1610 memcpy(array, sample->callchain, sz); 1611 array = (void *)array + sz; 1612 } 1613 1614 if (type & PERF_SAMPLE_RAW) { 1615 u.val32[0] = sample->raw_size; 1616 *array = u.val64; 1617 array = (void *)array + sizeof(u32); 1618 1619 memcpy(array, sample->raw_data, sample->raw_size); 1620 array = (void *)array + sample->raw_size; 1621 } 1622 1623 if (type & PERF_SAMPLE_BRANCH_STACK) { 1624 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1625 /* nr, hw_idx */ 1626 sz += 2 * sizeof(u64); 1627 memcpy(array, sample->branch_stack, sz); 1628 array = (void *)array + sz; 1629 } 1630 1631 if (type & PERF_SAMPLE_REGS_USER) { 1632 if (sample->user_regs.abi) { 1633 *array++ = sample->user_regs.abi; 1634 sz = hweight64(sample->user_regs.mask) * sizeof(u64); 1635 memcpy(array, sample->user_regs.regs, sz); 1636 array = (void *)array + sz; 1637 } else { 1638 *array++ = 0; 1639 } 1640 } 1641 1642 if (type & PERF_SAMPLE_STACK_USER) { 1643 sz = sample->user_stack.size; 1644 *array++ = sz; 1645 if (sz) { 1646 memcpy(array, sample->user_stack.data, sz); 1647 array = (void *)array + sz; 1648 *array++ = sz; 1649 } 1650 } 1651 1652 if (type & PERF_SAMPLE_WEIGHT_TYPE) { 1653 arch_perf_synthesize_sample_weight(sample, array, type); 1654 array++; 1655 } 1656 1657 if (type & PERF_SAMPLE_DATA_SRC) { 1658 *array = sample->data_src; 1659 array++; 1660 } 1661 1662 if (type & PERF_SAMPLE_TRANSACTION) { 1663 *array = sample->transaction; 1664 array++; 1665 } 1666 1667 if (type & PERF_SAMPLE_REGS_INTR) { 1668 if (sample->intr_regs.abi) { 1669 *array++ = sample->intr_regs.abi; 1670 sz = hweight64(sample->intr_regs.mask) * sizeof(u64); 1671 memcpy(array, sample->intr_regs.regs, sz); 1672 array = (void *)array + sz; 1673 } else { 1674 *array++ = 0; 1675 } 1676 } 1677 1678 if (type & PERF_SAMPLE_PHYS_ADDR) { 1679 *array = sample->phys_addr; 1680 array++; 1681 } 1682 1683 if (type & PERF_SAMPLE_CGROUP) { 1684 *array = sample->cgroup; 1685 array++; 1686 } 1687 1688 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) { 1689 *array = sample->data_page_size; 1690 array++; 1691 } 1692 1693 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) { 1694 *array = sample->code_page_size; 1695 array++; 1696 } 1697 1698 if (type & PERF_SAMPLE_AUX) { 1699 sz = sample->aux_sample.size; 1700 *array++ = sz; 1701 memcpy(array, sample->aux_sample.data, sz); 1702 array = (void *)array + sz; 1703 } 1704 1705 return 0; 1706 } 1707 1708 int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process, 1709 struct evlist *evlist, struct machine *machine) 1710 { 1711 union perf_event *ev; 1712 struct evsel *evsel; 1713 size_t nr = 0, i = 0, sz, max_nr, n; 1714 int err; 1715 1716 pr_debug2("Synthesizing id index\n"); 1717 1718 max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / 1719 sizeof(struct id_index_entry); 1720 1721 evlist__for_each_entry(evlist, evsel) 1722 nr += evsel->core.ids; 1723 1724 n = nr > max_nr ? max_nr : nr; 1725 sz = sizeof(struct perf_record_id_index) + n * sizeof(struct id_index_entry); 1726 ev = zalloc(sz); 1727 if (!ev) 1728 return -ENOMEM; 1729 1730 ev->id_index.header.type = PERF_RECORD_ID_INDEX; 1731 ev->id_index.header.size = sz; 1732 ev->id_index.nr = n; 1733 1734 evlist__for_each_entry(evlist, evsel) { 1735 u32 j; 1736 1737 for (j = 0; j < evsel->core.ids; j++) { 1738 struct id_index_entry *e; 1739 struct perf_sample_id *sid; 1740 1741 if (i >= n) { 1742 err = process(tool, ev, NULL, machine); 1743 if (err) 1744 goto out_err; 1745 nr -= n; 1746 i = 0; 1747 } 1748 1749 e = &ev->id_index.entries[i++]; 1750 1751 e->id = evsel->core.id[j]; 1752 1753 sid = evlist__id2sid(evlist, e->id); 1754 if (!sid) { 1755 free(ev); 1756 return -ENOENT; 1757 } 1758 1759 e->idx = sid->idx; 1760 e->cpu = sid->cpu; 1761 e->tid = sid->tid; 1762 } 1763 } 1764 1765 sz = sizeof(struct perf_record_id_index) + nr * sizeof(struct id_index_entry); 1766 ev->id_index.header.size = sz; 1767 ev->id_index.nr = nr; 1768 1769 err = process(tool, ev, NULL, machine); 1770 out_err: 1771 free(ev); 1772 1773 return err; 1774 } 1775 1776 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool, 1777 struct target *target, struct perf_thread_map *threads, 1778 perf_event__handler_t process, bool data_mmap, 1779 unsigned int nr_threads_synthesize) 1780 { 1781 if (target__has_task(target)) 1782 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap); 1783 else if (target__has_cpu(target)) 1784 return perf_event__synthesize_threads(tool, process, 1785 machine, data_mmap, 1786 nr_threads_synthesize); 1787 /* command specified */ 1788 return 0; 1789 } 1790 1791 int machine__synthesize_threads(struct machine *machine, struct target *target, 1792 struct perf_thread_map *threads, bool data_mmap, 1793 unsigned int nr_threads_synthesize) 1794 { 1795 return __machine__synthesize_threads(machine, NULL, target, threads, 1796 perf_event__process, data_mmap, 1797 nr_threads_synthesize); 1798 } 1799 1800 static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id) 1801 { 1802 struct perf_record_event_update *ev; 1803 1804 size += sizeof(*ev); 1805 size = PERF_ALIGN(size, sizeof(u64)); 1806 1807 ev = zalloc(size); 1808 if (ev) { 1809 ev->header.type = PERF_RECORD_EVENT_UPDATE; 1810 ev->header.size = (u16)size; 1811 ev->type = type; 1812 ev->id = id; 1813 } 1814 return ev; 1815 } 1816 1817 int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel, 1818 perf_event__handler_t process) 1819 { 1820 size_t size = strlen(evsel->unit); 1821 struct perf_record_event_update *ev; 1822 int err; 1823 1824 ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]); 1825 if (ev == NULL) 1826 return -ENOMEM; 1827 1828 strlcpy(ev->data, evsel->unit, size + 1); 1829 err = process(tool, (union perf_event *)ev, NULL, NULL); 1830 free(ev); 1831 return err; 1832 } 1833 1834 int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel, 1835 perf_event__handler_t process) 1836 { 1837 struct perf_record_event_update *ev; 1838 struct perf_record_event_update_scale *ev_data; 1839 int err; 1840 1841 ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]); 1842 if (ev == NULL) 1843 return -ENOMEM; 1844 1845 ev_data = (struct perf_record_event_update_scale *)ev->data; 1846 ev_data->scale = evsel->scale; 1847 err = process(tool, (union perf_event *)ev, NULL, NULL); 1848 free(ev); 1849 return err; 1850 } 1851 1852 int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel, 1853 perf_event__handler_t process) 1854 { 1855 struct perf_record_event_update *ev; 1856 size_t len = strlen(evsel->name); 1857 int err; 1858 1859 ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]); 1860 if (ev == NULL) 1861 return -ENOMEM; 1862 1863 strlcpy(ev->data, evsel->name, len + 1); 1864 err = process(tool, (union perf_event *)ev, NULL, NULL); 1865 free(ev); 1866 return err; 1867 } 1868 1869 int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel, 1870 perf_event__handler_t process) 1871 { 1872 size_t size = sizeof(struct perf_record_event_update); 1873 struct perf_record_event_update *ev; 1874 int max, err; 1875 u16 type; 1876 1877 if (!evsel->core.own_cpus) 1878 return 0; 1879 1880 ev = cpu_map_data__alloc(evsel->core.own_cpus, &size, &type, &max); 1881 if (!ev) 1882 return -ENOMEM; 1883 1884 ev->header.type = PERF_RECORD_EVENT_UPDATE; 1885 ev->header.size = (u16)size; 1886 ev->type = PERF_EVENT_UPDATE__CPUS; 1887 ev->id = evsel->core.id[0]; 1888 1889 cpu_map_data__synthesize((struct perf_record_cpu_map_data *)ev->data, 1890 evsel->core.own_cpus, type, max); 1891 1892 err = process(tool, (union perf_event *)ev, NULL, NULL); 1893 free(ev); 1894 return err; 1895 } 1896 1897 int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist, 1898 perf_event__handler_t process) 1899 { 1900 struct evsel *evsel; 1901 int err = 0; 1902 1903 evlist__for_each_entry(evlist, evsel) { 1904 err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids, 1905 evsel->core.id, process); 1906 if (err) { 1907 pr_debug("failed to create perf header attribute\n"); 1908 return err; 1909 } 1910 } 1911 1912 return err; 1913 } 1914 1915 static bool has_unit(struct evsel *evsel) 1916 { 1917 return evsel->unit && *evsel->unit; 1918 } 1919 1920 static bool has_scale(struct evsel *evsel) 1921 { 1922 return evsel->scale != 1; 1923 } 1924 1925 int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list, 1926 perf_event__handler_t process, bool is_pipe) 1927 { 1928 struct evsel *evsel; 1929 int err; 1930 1931 /* 1932 * Synthesize other events stuff not carried within 1933 * attr event - unit, scale, name 1934 */ 1935 evlist__for_each_entry(evsel_list, evsel) { 1936 if (!evsel->supported) 1937 continue; 1938 1939 /* 1940 * Synthesize unit and scale only if it's defined. 1941 */ 1942 if (has_unit(evsel)) { 1943 err = perf_event__synthesize_event_update_unit(tool, evsel, process); 1944 if (err < 0) { 1945 pr_err("Couldn't synthesize evsel unit.\n"); 1946 return err; 1947 } 1948 } 1949 1950 if (has_scale(evsel)) { 1951 err = perf_event__synthesize_event_update_scale(tool, evsel, process); 1952 if (err < 0) { 1953 pr_err("Couldn't synthesize evsel evsel.\n"); 1954 return err; 1955 } 1956 } 1957 1958 if (evsel->core.own_cpus) { 1959 err = perf_event__synthesize_event_update_cpus(tool, evsel, process); 1960 if (err < 0) { 1961 pr_err("Couldn't synthesize evsel cpus.\n"); 1962 return err; 1963 } 1964 } 1965 1966 /* 1967 * Name is needed only for pipe output, 1968 * perf.data carries event names. 1969 */ 1970 if (is_pipe) { 1971 err = perf_event__synthesize_event_update_name(tool, evsel, process); 1972 if (err < 0) { 1973 pr_err("Couldn't synthesize evsel name.\n"); 1974 return err; 1975 } 1976 } 1977 } 1978 return 0; 1979 } 1980 1981 int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr, 1982 u32 ids, u64 *id, perf_event__handler_t process) 1983 { 1984 union perf_event *ev; 1985 size_t size; 1986 int err; 1987 1988 size = sizeof(struct perf_event_attr); 1989 size = PERF_ALIGN(size, sizeof(u64)); 1990 size += sizeof(struct perf_event_header); 1991 size += ids * sizeof(u64); 1992 1993 ev = zalloc(size); 1994 1995 if (ev == NULL) 1996 return -ENOMEM; 1997 1998 ev->attr.attr = *attr; 1999 memcpy(ev->attr.id, id, ids * sizeof(u64)); 2000 2001 ev->attr.header.type = PERF_RECORD_HEADER_ATTR; 2002 ev->attr.header.size = (u16)size; 2003 2004 if (ev->attr.header.size == size) 2005 err = process(tool, ev, NULL, NULL); 2006 else 2007 err = -E2BIG; 2008 2009 free(ev); 2010 2011 return err; 2012 } 2013 2014 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist, 2015 perf_event__handler_t process) 2016 { 2017 union perf_event ev; 2018 struct tracing_data *tdata; 2019 ssize_t size = 0, aligned_size = 0, padding; 2020 struct feat_fd ff; 2021 2022 /* 2023 * We are going to store the size of the data followed 2024 * by the data contents. Since the fd descriptor is a pipe, 2025 * we cannot seek back to store the size of the data once 2026 * we know it. Instead we: 2027 * 2028 * - write the tracing data to the temp file 2029 * - get/write the data size to pipe 2030 * - write the tracing data from the temp file 2031 * to the pipe 2032 */ 2033 tdata = tracing_data_get(&evlist->core.entries, fd, true); 2034 if (!tdata) 2035 return -1; 2036 2037 memset(&ev, 0, sizeof(ev)); 2038 2039 ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA; 2040 size = tdata->size; 2041 aligned_size = PERF_ALIGN(size, sizeof(u64)); 2042 padding = aligned_size - size; 2043 ev.tracing_data.header.size = sizeof(ev.tracing_data); 2044 ev.tracing_data.size = aligned_size; 2045 2046 process(tool, &ev, NULL, NULL); 2047 2048 /* 2049 * The put function will copy all the tracing data 2050 * stored in temp file to the pipe. 2051 */ 2052 tracing_data_put(tdata); 2053 2054 ff = (struct feat_fd){ .fd = fd }; 2055 if (write_padded(&ff, NULL, 0, padding)) 2056 return -1; 2057 2058 return aligned_size; 2059 } 2060 2061 int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc, 2062 perf_event__handler_t process, struct machine *machine) 2063 { 2064 union perf_event ev; 2065 size_t len; 2066 2067 if (!pos->hit) 2068 return 0; 2069 2070 memset(&ev, 0, sizeof(ev)); 2071 2072 len = pos->long_name_len + 1; 2073 len = PERF_ALIGN(len, NAME_ALIGN); 2074 memcpy(&ev.build_id.build_id, pos->bid.data, sizeof(pos->bid.data)); 2075 ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID; 2076 ev.build_id.header.misc = misc; 2077 ev.build_id.pid = machine->pid; 2078 ev.build_id.header.size = sizeof(ev.build_id) + len; 2079 memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len); 2080 2081 return process(tool, &ev, NULL, machine); 2082 } 2083 2084 int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool, 2085 struct evlist *evlist, perf_event__handler_t process, bool attrs) 2086 { 2087 int err; 2088 2089 if (attrs) { 2090 err = perf_event__synthesize_attrs(tool, evlist, process); 2091 if (err < 0) { 2092 pr_err("Couldn't synthesize attrs.\n"); 2093 return err; 2094 } 2095 } 2096 2097 err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs); 2098 err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL); 2099 if (err < 0) { 2100 pr_err("Couldn't synthesize thread map.\n"); 2101 return err; 2102 } 2103 2104 err = perf_event__synthesize_cpu_map(tool, evlist->core.cpus, process, NULL); 2105 if (err < 0) { 2106 pr_err("Couldn't synthesize thread map.\n"); 2107 return err; 2108 } 2109 2110 err = perf_event__synthesize_stat_config(tool, config, process, NULL); 2111 if (err < 0) { 2112 pr_err("Couldn't synthesize config.\n"); 2113 return err; 2114 } 2115 2116 return 0; 2117 } 2118 2119 extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE]; 2120 2121 int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session, 2122 struct evlist *evlist, perf_event__handler_t process) 2123 { 2124 struct perf_header *header = &session->header; 2125 struct perf_record_header_feature *fe; 2126 struct feat_fd ff; 2127 size_t sz, sz_hdr; 2128 int feat, ret; 2129 2130 sz_hdr = sizeof(fe->header); 2131 sz = sizeof(union perf_event); 2132 /* get a nice alignment */ 2133 sz = PERF_ALIGN(sz, page_size); 2134 2135 memset(&ff, 0, sizeof(ff)); 2136 2137 ff.buf = malloc(sz); 2138 if (!ff.buf) 2139 return -ENOMEM; 2140 2141 ff.size = sz - sz_hdr; 2142 ff.ph = &session->header; 2143 2144 for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) { 2145 if (!feat_ops[feat].synthesize) { 2146 pr_debug("No record header feature for header :%d\n", feat); 2147 continue; 2148 } 2149 2150 ff.offset = sizeof(*fe); 2151 2152 ret = feat_ops[feat].write(&ff, evlist); 2153 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) { 2154 pr_debug("Error writing feature\n"); 2155 continue; 2156 } 2157 /* ff.buf may have changed due to realloc in do_write() */ 2158 fe = ff.buf; 2159 memset(fe, 0, sizeof(*fe)); 2160 2161 fe->feat_id = feat; 2162 fe->header.type = PERF_RECORD_HEADER_FEATURE; 2163 fe->header.size = ff.offset; 2164 2165 ret = process(tool, ff.buf, NULL, NULL); 2166 if (ret) { 2167 free(ff.buf); 2168 return ret; 2169 } 2170 } 2171 2172 /* Send HEADER_LAST_FEATURE mark. */ 2173 fe = ff.buf; 2174 fe->feat_id = HEADER_LAST_FEATURE; 2175 fe->header.type = PERF_RECORD_HEADER_FEATURE; 2176 fe->header.size = sizeof(*fe); 2177 2178 ret = process(tool, ff.buf, NULL, NULL); 2179 2180 free(ff.buf); 2181 return ret; 2182 } 2183 2184 int perf_event__synthesize_for_pipe(struct perf_tool *tool, 2185 struct perf_session *session, 2186 struct perf_data *data, 2187 perf_event__handler_t process) 2188 { 2189 int err; 2190 int ret = 0; 2191 struct evlist *evlist = session->evlist; 2192 2193 /* 2194 * We need to synthesize events first, because some 2195 * features works on top of them (on report side). 2196 */ 2197 err = perf_event__synthesize_attrs(tool, evlist, process); 2198 if (err < 0) { 2199 pr_err("Couldn't synthesize attrs.\n"); 2200 return err; 2201 } 2202 ret += err; 2203 2204 err = perf_event__synthesize_features(tool, session, evlist, process); 2205 if (err < 0) { 2206 pr_err("Couldn't synthesize features.\n"); 2207 return err; 2208 } 2209 ret += err; 2210 2211 if (have_tracepoints(&evlist->core.entries)) { 2212 int fd = perf_data__fd(data); 2213 2214 /* 2215 * FIXME err <= 0 here actually means that 2216 * there were no tracepoints so its not really 2217 * an error, just that we don't need to 2218 * synthesize anything. We really have to 2219 * return this more properly and also 2220 * propagate errors that now are calling die() 2221 */ 2222 err = perf_event__synthesize_tracing_data(tool, fd, evlist, 2223 process); 2224 if (err <= 0) { 2225 pr_err("Couldn't record tracing data.\n"); 2226 return err; 2227 } 2228 ret += err; 2229 } 2230 2231 return ret; 2232 } 2233