1 // SPDX-License-Identifier: GPL-2.0 2 #include <sys/sysmacros.h> 3 #include <sys/types.h> 4 #include <errno.h> 5 #include <libgen.h> 6 #include <stdio.h> 7 #include <stdlib.h> 8 #include <string.h> 9 #include <fcntl.h> 10 #include <unistd.h> 11 #include <inttypes.h> 12 #include <byteswap.h> 13 #include <sys/stat.h> 14 #include <sys/mman.h> 15 #include <linux/stringify.h> 16 17 #include "build-id.h" 18 #include "event.h" 19 #include "debug.h" 20 #include "evlist.h" 21 #include "symbol.h" 22 #include <elf.h> 23 24 #include "tsc.h" 25 #include "session.h" 26 #include "jit.h" 27 #include "jitdump.h" 28 #include "genelf.h" 29 #include "thread.h" 30 31 #include <linux/ctype.h> 32 #include <linux/zalloc.h> 33 34 struct jit_buf_desc { 35 struct perf_data *output; 36 struct perf_session *session; 37 struct machine *machine; 38 union jr_entry *entry; 39 void *buf; 40 uint64_t sample_type; 41 size_t bufsize; 42 FILE *in; 43 bool needs_bswap; /* handles cross-endianness */ 44 bool use_arch_timestamp; 45 void *debug_data; 46 void *unwinding_data; 47 uint64_t unwinding_size; 48 uint64_t unwinding_mapped_size; 49 uint64_t eh_frame_hdr_size; 50 size_t nr_debug_entries; 51 uint32_t code_load_count; 52 u64 bytes_written; 53 struct rb_root code_root; 54 char dir[PATH_MAX]; 55 }; 56 57 struct debug_line_info { 58 unsigned long vma; 59 unsigned int lineno; 60 /* The filename format is unspecified, absolute path, relative etc. */ 61 char const filename[]; 62 }; 63 64 struct jit_tool { 65 struct perf_tool tool; 66 struct perf_data output; 67 struct perf_data input; 68 u64 bytes_written; 69 }; 70 71 #define hmax(a, b) ((a) > (b) ? (a) : (b)) 72 #define get_jit_tool(t) (container_of(tool, struct jit_tool, tool)) 73 74 static int 75 jit_emit_elf(char *filename, 76 const char *sym, 77 uint64_t code_addr, 78 const void *code, 79 int csize, 80 void *debug, 81 int nr_debug_entries, 82 void *unwinding, 83 uint32_t unwinding_header_size, 84 uint32_t unwinding_size) 85 { 86 int ret, fd; 87 88 if (verbose > 0) 89 fprintf(stderr, "write ELF image %s\n", filename); 90 91 fd = open(filename, O_CREAT|O_TRUNC|O_WRONLY, 0644); 92 if (fd == -1) { 93 pr_warning("cannot create jit ELF %s: %s\n", filename, strerror(errno)); 94 return -1; 95 } 96 97 ret = jit_write_elf(fd, code_addr, sym, (const void *)code, csize, debug, nr_debug_entries, 98 unwinding, unwinding_header_size, unwinding_size); 99 100 close(fd); 101 102 if (ret) 103 unlink(filename); 104 105 return ret; 106 } 107 108 static void 109 jit_close(struct jit_buf_desc *jd) 110 { 111 if (!(jd && jd->in)) 112 return; 113 funlockfile(jd->in); 114 fclose(jd->in); 115 jd->in = NULL; 116 } 117 118 static int 119 jit_validate_events(struct perf_session *session) 120 { 121 struct evsel *evsel; 122 123 /* 124 * check that all events use CLOCK_MONOTONIC 125 */ 126 evlist__for_each_entry(session->evlist, evsel) { 127 if (evsel->core.attr.use_clockid == 0 || evsel->core.attr.clockid != CLOCK_MONOTONIC) 128 return -1; 129 } 130 return 0; 131 } 132 133 static int 134 jit_open(struct jit_buf_desc *jd, const char *name) 135 { 136 struct jitheader header; 137 struct jr_prefix *prefix; 138 ssize_t bs, bsz = 0; 139 void *n, *buf = NULL; 140 int ret, retval = -1; 141 142 jd->in = fopen(name, "r"); 143 if (!jd->in) 144 return -1; 145 146 bsz = hmax(sizeof(header), sizeof(*prefix)); 147 148 buf = malloc(bsz); 149 if (!buf) 150 goto error; 151 152 /* 153 * protect from writer modifying the file while we are reading it 154 */ 155 flockfile(jd->in); 156 157 ret = fread(buf, sizeof(header), 1, jd->in); 158 if (ret != 1) 159 goto error; 160 161 memcpy(&header, buf, sizeof(header)); 162 163 if (header.magic != JITHEADER_MAGIC) { 164 if (header.magic != JITHEADER_MAGIC_SW) 165 goto error; 166 jd->needs_bswap = true; 167 } 168 169 if (jd->needs_bswap) { 170 header.version = bswap_32(header.version); 171 header.total_size = bswap_32(header.total_size); 172 header.pid = bswap_32(header.pid); 173 header.elf_mach = bswap_32(header.elf_mach); 174 header.timestamp = bswap_64(header.timestamp); 175 header.flags = bswap_64(header.flags); 176 } 177 178 jd->use_arch_timestamp = header.flags & JITDUMP_FLAGS_ARCH_TIMESTAMP; 179 180 if (verbose > 2) 181 pr_debug("version=%u\nhdr.size=%u\nts=0x%llx\npid=%d\nelf_mach=%d\nuse_arch_timestamp=%d\n", 182 header.version, 183 header.total_size, 184 (unsigned long long)header.timestamp, 185 header.pid, 186 header.elf_mach, 187 jd->use_arch_timestamp); 188 189 if (header.version > JITHEADER_VERSION) { 190 pr_err("wrong jitdump version %u, expected " __stringify(JITHEADER_VERSION), 191 header.version); 192 goto error; 193 } 194 195 if (header.flags & JITDUMP_FLAGS_RESERVED) { 196 pr_err("jitdump file contains invalid or unsupported flags 0x%llx\n", 197 (unsigned long long)header.flags & JITDUMP_FLAGS_RESERVED); 198 goto error; 199 } 200 201 if (jd->use_arch_timestamp && !jd->session->time_conv.time_mult) { 202 pr_err("jitdump file uses arch timestamps but there is no timestamp conversion\n"); 203 goto error; 204 } 205 206 /* 207 * validate event is using the correct clockid 208 */ 209 if (!jd->use_arch_timestamp && jit_validate_events(jd->session)) { 210 pr_err("error, jitted code must be sampled with perf record -k 1\n"); 211 goto error; 212 } 213 214 bs = header.total_size - sizeof(header); 215 216 if (bs > bsz) { 217 n = realloc(buf, bs); 218 if (!n) 219 goto error; 220 bsz = bs; 221 buf = n; 222 /* read extra we do not know about */ 223 ret = fread(buf, bs - bsz, 1, jd->in); 224 if (ret != 1) 225 goto error; 226 } 227 /* 228 * keep dirname for generating files and mmap records 229 */ 230 strcpy(jd->dir, name); 231 dirname(jd->dir); 232 233 return 0; 234 error: 235 funlockfile(jd->in); 236 fclose(jd->in); 237 return retval; 238 } 239 240 static union jr_entry * 241 jit_get_next_entry(struct jit_buf_desc *jd) 242 { 243 struct jr_prefix *prefix; 244 union jr_entry *jr; 245 void *addr; 246 size_t bs, size; 247 int id, ret; 248 249 if (!(jd && jd->in)) 250 return NULL; 251 252 if (jd->buf == NULL) { 253 size_t sz = getpagesize(); 254 if (sz < sizeof(*prefix)) 255 sz = sizeof(*prefix); 256 257 jd->buf = malloc(sz); 258 if (jd->buf == NULL) 259 return NULL; 260 261 jd->bufsize = sz; 262 } 263 264 prefix = jd->buf; 265 266 /* 267 * file is still locked at this point 268 */ 269 ret = fread(prefix, sizeof(*prefix), 1, jd->in); 270 if (ret != 1) 271 return NULL; 272 273 if (jd->needs_bswap) { 274 prefix->id = bswap_32(prefix->id); 275 prefix->total_size = bswap_32(prefix->total_size); 276 prefix->timestamp = bswap_64(prefix->timestamp); 277 } 278 id = prefix->id; 279 size = prefix->total_size; 280 281 bs = (size_t)size; 282 if (bs < sizeof(*prefix)) 283 return NULL; 284 285 if (id >= JIT_CODE_MAX) { 286 pr_warning("next_entry: unknown record type %d, skipping\n", id); 287 } 288 if (bs > jd->bufsize) { 289 void *n; 290 n = realloc(jd->buf, bs); 291 if (!n) 292 return NULL; 293 jd->buf = n; 294 jd->bufsize = bs; 295 } 296 297 addr = ((void *)jd->buf) + sizeof(*prefix); 298 299 ret = fread(addr, bs - sizeof(*prefix), 1, jd->in); 300 if (ret != 1) 301 return NULL; 302 303 jr = (union jr_entry *)jd->buf; 304 305 switch(id) { 306 case JIT_CODE_DEBUG_INFO: 307 if (jd->needs_bswap) { 308 uint64_t n; 309 jr->info.code_addr = bswap_64(jr->info.code_addr); 310 jr->info.nr_entry = bswap_64(jr->info.nr_entry); 311 for (n = 0 ; n < jr->info.nr_entry; n++) { 312 jr->info.entries[n].addr = bswap_64(jr->info.entries[n].addr); 313 jr->info.entries[n].lineno = bswap_32(jr->info.entries[n].lineno); 314 jr->info.entries[n].discrim = bswap_32(jr->info.entries[n].discrim); 315 } 316 } 317 break; 318 case JIT_CODE_UNWINDING_INFO: 319 if (jd->needs_bswap) { 320 jr->unwinding.unwinding_size = bswap_64(jr->unwinding.unwinding_size); 321 jr->unwinding.eh_frame_hdr_size = bswap_64(jr->unwinding.eh_frame_hdr_size); 322 jr->unwinding.mapped_size = bswap_64(jr->unwinding.mapped_size); 323 } 324 break; 325 case JIT_CODE_CLOSE: 326 break; 327 case JIT_CODE_LOAD: 328 if (jd->needs_bswap) { 329 jr->load.pid = bswap_32(jr->load.pid); 330 jr->load.tid = bswap_32(jr->load.tid); 331 jr->load.vma = bswap_64(jr->load.vma); 332 jr->load.code_addr = bswap_64(jr->load.code_addr); 333 jr->load.code_size = bswap_64(jr->load.code_size); 334 jr->load.code_index= bswap_64(jr->load.code_index); 335 } 336 jd->code_load_count++; 337 break; 338 case JIT_CODE_MOVE: 339 if (jd->needs_bswap) { 340 jr->move.pid = bswap_32(jr->move.pid); 341 jr->move.tid = bswap_32(jr->move.tid); 342 jr->move.vma = bswap_64(jr->move.vma); 343 jr->move.old_code_addr = bswap_64(jr->move.old_code_addr); 344 jr->move.new_code_addr = bswap_64(jr->move.new_code_addr); 345 jr->move.code_size = bswap_64(jr->move.code_size); 346 jr->move.code_index = bswap_64(jr->move.code_index); 347 } 348 break; 349 case JIT_CODE_MAX: 350 default: 351 /* skip unknown record (we have read them) */ 352 break; 353 } 354 return jr; 355 } 356 357 static int 358 jit_inject_event(struct jit_buf_desc *jd, union perf_event *event) 359 { 360 ssize_t size; 361 362 size = perf_data__write(jd->output, event, event->header.size); 363 if (size < 0) 364 return -1; 365 366 jd->bytes_written += size; 367 return 0; 368 } 369 370 static uint64_t convert_timestamp(struct jit_buf_desc *jd, uint64_t timestamp) 371 { 372 struct perf_tsc_conversion tc; 373 374 if (!jd->use_arch_timestamp) 375 return timestamp; 376 377 tc.time_shift = jd->session->time_conv.time_shift; 378 tc.time_mult = jd->session->time_conv.time_mult; 379 tc.time_zero = jd->session->time_conv.time_zero; 380 tc.time_cycles = jd->session->time_conv.time_cycles; 381 tc.time_mask = jd->session->time_conv.time_mask; 382 tc.cap_user_time_zero = jd->session->time_conv.cap_user_time_zero; 383 tc.cap_user_time_short = jd->session->time_conv.cap_user_time_short; 384 385 if (!tc.cap_user_time_zero) 386 return 0; 387 388 return tsc_to_perf_time(timestamp, &tc); 389 } 390 391 static int jit_repipe_code_load(struct jit_buf_desc *jd, union jr_entry *jr) 392 { 393 struct perf_sample sample; 394 union perf_event *event; 395 struct perf_tool *tool = jd->session->tool; 396 uint64_t code, addr; 397 uintptr_t uaddr; 398 char *filename; 399 struct stat st; 400 size_t size; 401 u16 idr_size; 402 const char *sym; 403 uint64_t count; 404 int ret, csize, usize; 405 pid_t pid, tid; 406 struct { 407 u32 pid, tid; 408 u64 time; 409 } *id; 410 411 pid = jr->load.pid; 412 tid = jr->load.tid; 413 csize = jr->load.code_size; 414 usize = jd->unwinding_mapped_size; 415 addr = jr->load.code_addr; 416 sym = (void *)((unsigned long)jr + sizeof(jr->load)); 417 code = (unsigned long)jr + jr->load.p.total_size - csize; 418 count = jr->load.code_index; 419 idr_size = jd->machine->id_hdr_size; 420 421 event = calloc(1, sizeof(*event) + idr_size); 422 if (!event) 423 return -1; 424 425 filename = event->mmap2.filename; 426 size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%" PRIu64 ".so", 427 jd->dir, 428 pid, 429 count); 430 431 size++; /* for \0 */ 432 433 size = PERF_ALIGN(size, sizeof(u64)); 434 uaddr = (uintptr_t)code; 435 ret = jit_emit_elf(filename, sym, addr, (const void *)uaddr, csize, jd->debug_data, jd->nr_debug_entries, 436 jd->unwinding_data, jd->eh_frame_hdr_size, jd->unwinding_size); 437 438 if (jd->debug_data && jd->nr_debug_entries) { 439 zfree(&jd->debug_data); 440 jd->nr_debug_entries = 0; 441 } 442 443 if (jd->unwinding_data && jd->eh_frame_hdr_size) { 444 zfree(&jd->unwinding_data); 445 jd->eh_frame_hdr_size = 0; 446 jd->unwinding_mapped_size = 0; 447 jd->unwinding_size = 0; 448 } 449 450 if (ret) { 451 free(event); 452 return -1; 453 } 454 if (stat(filename, &st)) 455 memset(&st, 0, sizeof(st)); 456 457 event->mmap2.header.type = PERF_RECORD_MMAP2; 458 event->mmap2.header.misc = PERF_RECORD_MISC_USER; 459 event->mmap2.header.size = (sizeof(event->mmap2) - 460 (sizeof(event->mmap2.filename) - size) + idr_size); 461 462 event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET; 463 event->mmap2.start = addr; 464 event->mmap2.len = usize ? ALIGN_8(csize) + usize : csize; 465 event->mmap2.pid = pid; 466 event->mmap2.tid = tid; 467 event->mmap2.ino = st.st_ino; 468 event->mmap2.maj = major(st.st_dev); 469 event->mmap2.min = minor(st.st_dev); 470 event->mmap2.prot = st.st_mode; 471 event->mmap2.flags = MAP_SHARED; 472 event->mmap2.ino_generation = 1; 473 474 id = (void *)((unsigned long)event + event->mmap.header.size - idr_size); 475 if (jd->sample_type & PERF_SAMPLE_TID) { 476 id->pid = pid; 477 id->tid = tid; 478 } 479 if (jd->sample_type & PERF_SAMPLE_TIME) 480 id->time = convert_timestamp(jd, jr->load.p.timestamp); 481 482 /* 483 * create pseudo sample to induce dso hit increment 484 * use first address as sample address 485 */ 486 memset(&sample, 0, sizeof(sample)); 487 sample.cpumode = PERF_RECORD_MISC_USER; 488 sample.pid = pid; 489 sample.tid = tid; 490 sample.time = id->time; 491 sample.ip = addr; 492 493 ret = perf_event__process_mmap2(tool, event, &sample, jd->machine); 494 if (ret) 495 return ret; 496 497 ret = jit_inject_event(jd, event); 498 /* 499 * mark dso as use to generate buildid in the header 500 */ 501 if (!ret) 502 build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine); 503 504 return ret; 505 } 506 507 static int jit_repipe_code_move(struct jit_buf_desc *jd, union jr_entry *jr) 508 { 509 struct perf_sample sample; 510 union perf_event *event; 511 struct perf_tool *tool = jd->session->tool; 512 char *filename; 513 size_t size; 514 struct stat st; 515 int usize; 516 u16 idr_size; 517 int ret; 518 pid_t pid, tid; 519 struct { 520 u32 pid, tid; 521 u64 time; 522 } *id; 523 524 pid = jr->move.pid; 525 tid = jr->move.tid; 526 usize = jd->unwinding_mapped_size; 527 idr_size = jd->machine->id_hdr_size; 528 529 /* 530 * +16 to account for sample_id_all (hack) 531 */ 532 event = calloc(1, sizeof(*event) + 16); 533 if (!event) 534 return -1; 535 536 filename = event->mmap2.filename; 537 size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%" PRIu64 ".so", 538 jd->dir, 539 pid, 540 jr->move.code_index); 541 542 size++; /* for \0 */ 543 544 if (stat(filename, &st)) 545 memset(&st, 0, sizeof(st)); 546 547 size = PERF_ALIGN(size, sizeof(u64)); 548 549 event->mmap2.header.type = PERF_RECORD_MMAP2; 550 event->mmap2.header.misc = PERF_RECORD_MISC_USER; 551 event->mmap2.header.size = (sizeof(event->mmap2) - 552 (sizeof(event->mmap2.filename) - size) + idr_size); 553 event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET; 554 event->mmap2.start = jr->move.new_code_addr; 555 event->mmap2.len = usize ? ALIGN_8(jr->move.code_size) + usize 556 : jr->move.code_size; 557 event->mmap2.pid = pid; 558 event->mmap2.tid = tid; 559 event->mmap2.ino = st.st_ino; 560 event->mmap2.maj = major(st.st_dev); 561 event->mmap2.min = minor(st.st_dev); 562 event->mmap2.prot = st.st_mode; 563 event->mmap2.flags = MAP_SHARED; 564 event->mmap2.ino_generation = 1; 565 566 id = (void *)((unsigned long)event + event->mmap.header.size - idr_size); 567 if (jd->sample_type & PERF_SAMPLE_TID) { 568 id->pid = pid; 569 id->tid = tid; 570 } 571 if (jd->sample_type & PERF_SAMPLE_TIME) 572 id->time = convert_timestamp(jd, jr->load.p.timestamp); 573 574 /* 575 * create pseudo sample to induce dso hit increment 576 * use first address as sample address 577 */ 578 memset(&sample, 0, sizeof(sample)); 579 sample.cpumode = PERF_RECORD_MISC_USER; 580 sample.pid = pid; 581 sample.tid = tid; 582 sample.time = id->time; 583 sample.ip = jr->move.new_code_addr; 584 585 ret = perf_event__process_mmap2(tool, event, &sample, jd->machine); 586 if (ret) 587 return ret; 588 589 ret = jit_inject_event(jd, event); 590 if (!ret) 591 build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine); 592 593 return ret; 594 } 595 596 static int jit_repipe_debug_info(struct jit_buf_desc *jd, union jr_entry *jr) 597 { 598 void *data; 599 size_t sz; 600 601 if (!(jd && jr)) 602 return -1; 603 604 sz = jr->prefix.total_size - sizeof(jr->info); 605 data = malloc(sz); 606 if (!data) 607 return -1; 608 609 memcpy(data, &jr->info.entries, sz); 610 611 jd->debug_data = data; 612 613 /* 614 * we must use nr_entry instead of size here because 615 * we cannot distinguish actual entry from padding otherwise 616 */ 617 jd->nr_debug_entries = jr->info.nr_entry; 618 619 return 0; 620 } 621 622 static int 623 jit_repipe_unwinding_info(struct jit_buf_desc *jd, union jr_entry *jr) 624 { 625 void *unwinding_data; 626 uint32_t unwinding_data_size; 627 628 if (!(jd && jr)) 629 return -1; 630 631 unwinding_data_size = jr->prefix.total_size - sizeof(jr->unwinding); 632 unwinding_data = malloc(unwinding_data_size); 633 if (!unwinding_data) 634 return -1; 635 636 memcpy(unwinding_data, &jr->unwinding.unwinding_data, 637 unwinding_data_size); 638 639 jd->eh_frame_hdr_size = jr->unwinding.eh_frame_hdr_size; 640 jd->unwinding_size = jr->unwinding.unwinding_size; 641 jd->unwinding_mapped_size = jr->unwinding.mapped_size; 642 jd->unwinding_data = unwinding_data; 643 644 return 0; 645 } 646 647 static int 648 jit_process_dump(struct jit_buf_desc *jd) 649 { 650 union jr_entry *jr; 651 int ret = 0; 652 653 while ((jr = jit_get_next_entry(jd))) { 654 switch(jr->prefix.id) { 655 case JIT_CODE_LOAD: 656 ret = jit_repipe_code_load(jd, jr); 657 break; 658 case JIT_CODE_MOVE: 659 ret = jit_repipe_code_move(jd, jr); 660 break; 661 case JIT_CODE_DEBUG_INFO: 662 ret = jit_repipe_debug_info(jd, jr); 663 break; 664 case JIT_CODE_UNWINDING_INFO: 665 ret = jit_repipe_unwinding_info(jd, jr); 666 break; 667 default: 668 ret = 0; 669 continue; 670 } 671 } 672 return ret; 673 } 674 675 static int 676 jit_inject(struct jit_buf_desc *jd, char *path) 677 { 678 int ret; 679 680 if (verbose > 0) 681 fprintf(stderr, "injecting: %s\n", path); 682 683 ret = jit_open(jd, path); 684 if (ret) 685 return -1; 686 687 ret = jit_process_dump(jd); 688 689 jit_close(jd); 690 691 if (verbose > 0) 692 fprintf(stderr, "injected: %s (%d)\n", path, ret); 693 694 return 0; 695 } 696 697 /* 698 * File must be with pattern .../jit-XXXX.dump 699 * where XXXX is the PID of the process which did the mmap() 700 * as captured in the RECORD_MMAP record 701 */ 702 static int 703 jit_detect(char *mmap_name, pid_t pid) 704 { 705 char *p; 706 char *end = NULL; 707 pid_t pid2; 708 709 if (verbose > 2) 710 fprintf(stderr, "jit marker trying : %s\n", mmap_name); 711 /* 712 * get file name 713 */ 714 p = strrchr(mmap_name, '/'); 715 if (!p) 716 return -1; 717 718 /* 719 * match prefix 720 */ 721 if (strncmp(p, "/jit-", 5)) 722 return -1; 723 724 /* 725 * skip prefix 726 */ 727 p += 5; 728 729 /* 730 * must be followed by a pid 731 */ 732 if (!isdigit(*p)) 733 return -1; 734 735 pid2 = (int)strtol(p, &end, 10); 736 if (!end) 737 return -1; 738 739 /* 740 * pid does not match mmap pid 741 * pid==0 in system-wide mode (synthesized) 742 */ 743 if (pid && pid2 != pid) 744 return -1; 745 /* 746 * validate suffix 747 */ 748 if (strcmp(end, ".dump")) 749 return -1; 750 751 if (verbose > 0) 752 fprintf(stderr, "jit marker found: %s\n", mmap_name); 753 754 return 0; 755 } 756 757 static void jit_add_pid(struct machine *machine, pid_t pid) 758 { 759 struct thread *thread = machine__findnew_thread(machine, pid, pid); 760 761 if (!thread) { 762 pr_err("%s: thread %d not found or created\n", __func__, pid); 763 return; 764 } 765 766 thread->priv = (void *)1; 767 } 768 769 static bool jit_has_pid(struct machine *machine, pid_t pid) 770 { 771 struct thread *thread = machine__find_thread(machine, pid, pid); 772 773 if (!thread) 774 return 0; 775 776 return (bool)thread->priv; 777 } 778 779 int 780 jit_process(struct perf_session *session, 781 struct perf_data *output, 782 struct machine *machine, 783 char *filename, 784 pid_t pid, 785 u64 *nbytes) 786 { 787 struct evsel *first; 788 struct jit_buf_desc jd; 789 int ret; 790 791 /* 792 * first, detect marker mmap (i.e., the jitdump mmap) 793 */ 794 if (jit_detect(filename, pid)) { 795 // Strip //anon* mmaps if we processed a jitdump for this pid 796 if (jit_has_pid(machine, pid) && (strncmp(filename, "//anon", 6) == 0)) 797 return 1; 798 799 return 0; 800 } 801 802 memset(&jd, 0, sizeof(jd)); 803 804 jd.session = session; 805 jd.output = output; 806 jd.machine = machine; 807 808 /* 809 * track sample_type to compute id_all layout 810 * perf sets the same sample type to all events as of now 811 */ 812 first = evlist__first(session->evlist); 813 jd.sample_type = first->core.attr.sample_type; 814 815 *nbytes = 0; 816 817 ret = jit_inject(&jd, filename); 818 if (!ret) { 819 jit_add_pid(machine, pid); 820 *nbytes = jd.bytes_written; 821 ret = 1; 822 } 823 824 return ret; 825 } 826