890 lines · c
1// SPDX-License-Identifier: GPL-2.02#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 "namespaces.h"22#include "symbol.h"23#include <elf.h>24 25#include "tsc.h"26#include "session.h"27#include "jit.h"28#include "jitdump.h"29#include "genelf.h"30#include "thread.h"31 32#include <linux/ctype.h>33#include <linux/zalloc.h>34 35struct jit_buf_desc {36 struct perf_data *output;37 struct perf_session *session;38 struct machine *machine;39 struct nsinfo *nsi;40 union jr_entry *entry;41 void *buf;42 uint64_t sample_type;43 size_t bufsize;44 FILE *in;45 bool needs_bswap; /* handles cross-endianness */46 bool use_arch_timestamp;47 void *debug_data;48 void *unwinding_data;49 uint64_t unwinding_size;50 uint64_t unwinding_mapped_size;51 uint64_t eh_frame_hdr_size;52 size_t nr_debug_entries;53 uint32_t code_load_count;54 u64 bytes_written;55 struct rb_root code_root;56 char dir[PATH_MAX];57};58 59struct jit_tool {60 struct perf_tool tool;61 struct perf_data output;62 struct perf_data input;63 u64 bytes_written;64};65 66#define hmax(a, b) ((a) > (b) ? (a) : (b))67#define get_jit_tool(t) (container_of(tool, struct jit_tool, tool))68 69static int70jit_emit_elf(struct jit_buf_desc *jd,71 char *filename,72 const char *sym,73 uint64_t code_addr,74 const void *code,75 int csize,76 void *debug,77 int nr_debug_entries,78 void *unwinding,79 uint32_t unwinding_header_size,80 uint32_t unwinding_size)81{82 int ret, fd, saved_errno;83 struct nscookie nsc;84 85 if (verbose > 0)86 fprintf(stderr, "write ELF image %s\n", filename);87 88 nsinfo__mountns_enter(jd->nsi, &nsc);89 fd = open(filename, O_CREAT|O_TRUNC|O_WRONLY, 0644);90 saved_errno = errno;91 nsinfo__mountns_exit(&nsc);92 if (fd == -1) {93 pr_warning("cannot create jit ELF %s: %s\n", filename, strerror(saved_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 nsinfo__mountns_enter(jd->nsi, &nsc);104 unlink(filename);105 nsinfo__mountns_exit(&nsc);106 }107 108 return ret;109}110 111static void112jit_close(struct jit_buf_desc *jd)113{114 if (!(jd && jd->in))115 return;116 funlockfile(jd->in);117 fclose(jd->in);118 jd->in = NULL;119}120 121static int122jit_validate_events(struct perf_session *session)123{124 struct evsel *evsel;125 126 /*127 * check that all events use CLOCK_MONOTONIC128 */129 evlist__for_each_entry(session->evlist, evsel) {130 if (evsel->core.attr.use_clockid == 0 || evsel->core.attr.clockid != CLOCK_MONOTONIC)131 return -1;132 }133 return 0;134}135 136static int137jit_open(struct jit_buf_desc *jd, const char *name)138{139 struct jitheader header;140 struct nscookie nsc;141 struct jr_prefix *prefix;142 ssize_t bs, bsz = 0;143 void *n, *buf = NULL;144 int ret, retval = -1;145 146 nsinfo__mountns_enter(jd->nsi, &nsc);147 jd->in = fopen(name, "r");148 nsinfo__mountns_exit(&nsc);149 if (!jd->in)150 return -1;151 152 bsz = hmax(sizeof(header), sizeof(*prefix));153 154 buf = malloc(bsz);155 if (!buf)156 goto error;157 158 /*159 * protect from writer modifying the file while we are reading it160 */161 flockfile(jd->in);162 163 ret = fread(buf, sizeof(header), 1, jd->in);164 if (ret != 1)165 goto error;166 167 memcpy(&header, buf, sizeof(header));168 169 if (header.magic != JITHEADER_MAGIC) {170 if (header.magic != JITHEADER_MAGIC_SW)171 goto error;172 jd->needs_bswap = true;173 }174 175 if (jd->needs_bswap) {176 header.version = bswap_32(header.version);177 header.total_size = bswap_32(header.total_size);178 header.pid = bswap_32(header.pid);179 header.elf_mach = bswap_32(header.elf_mach);180 header.timestamp = bswap_64(header.timestamp);181 header.flags = bswap_64(header.flags);182 }183 184 jd->use_arch_timestamp = header.flags & JITDUMP_FLAGS_ARCH_TIMESTAMP;185 186 if (verbose > 2)187 pr_debug("version=%u\nhdr.size=%u\nts=0x%llx\npid=%d\nelf_mach=%d\nuse_arch_timestamp=%d\n",188 header.version,189 header.total_size,190 (unsigned long long)header.timestamp,191 header.pid,192 header.elf_mach,193 jd->use_arch_timestamp);194 195 if (header.version > JITHEADER_VERSION) {196 pr_err("wrong jitdump version %u, expected " __stringify(JITHEADER_VERSION),197 header.version);198 goto error;199 }200 201 if (header.flags & JITDUMP_FLAGS_RESERVED) {202 pr_err("jitdump file contains invalid or unsupported flags 0x%llx\n",203 (unsigned long long)header.flags & JITDUMP_FLAGS_RESERVED);204 goto error;205 }206 207 if (jd->use_arch_timestamp && !jd->session->time_conv.time_mult) {208 pr_err("jitdump file uses arch timestamps but there is no timestamp conversion\n");209 goto error;210 }211 212 /*213 * validate event is using the correct clockid214 */215 if (!jd->use_arch_timestamp && jit_validate_events(jd->session)) {216 pr_err("error, jitted code must be sampled with perf record -k 1\n");217 goto error;218 }219 220 bs = header.total_size - sizeof(header);221 222 if (bs > bsz) {223 n = realloc(buf, bs);224 if (!n)225 goto error;226 bsz = bs;227 buf = n;228 /* read extra we do not know about */229 ret = fread(buf, bs - bsz, 1, jd->in);230 if (ret != 1)231 goto error;232 }233 /*234 * keep dirname for generating files and mmap records235 */236 strcpy(jd->dir, name);237 dirname(jd->dir);238 free(buf);239 240 return 0;241error:242 free(buf);243 funlockfile(jd->in);244 fclose(jd->in);245 return retval;246}247 248static union jr_entry *249jit_get_next_entry(struct jit_buf_desc *jd)250{251 struct jr_prefix *prefix;252 union jr_entry *jr;253 void *addr;254 size_t bs, size;255 int id, ret;256 257 if (!(jd && jd->in))258 return NULL;259 260 if (jd->buf == NULL) {261 size_t sz = getpagesize();262 if (sz < sizeof(*prefix))263 sz = sizeof(*prefix);264 265 jd->buf = malloc(sz);266 if (jd->buf == NULL)267 return NULL;268 269 jd->bufsize = sz;270 }271 272 prefix = jd->buf;273 274 /*275 * file is still locked at this point276 */277 ret = fread(prefix, sizeof(*prefix), 1, jd->in);278 if (ret != 1)279 return NULL;280 281 if (jd->needs_bswap) {282 prefix->id = bswap_32(prefix->id);283 prefix->total_size = bswap_32(prefix->total_size);284 prefix->timestamp = bswap_64(prefix->timestamp);285 }286 id = prefix->id;287 size = prefix->total_size;288 289 bs = (size_t)size;290 if (bs < sizeof(*prefix))291 return NULL;292 293 if (id >= JIT_CODE_MAX) {294 pr_warning("next_entry: unknown record type %d, skipping\n", id);295 }296 if (bs > jd->bufsize) {297 void *n;298 n = realloc(jd->buf, bs);299 if (!n)300 return NULL;301 jd->buf = n;302 jd->bufsize = bs;303 }304 305 addr = ((void *)jd->buf) + sizeof(*prefix);306 307 ret = fread(addr, bs - sizeof(*prefix), 1, jd->in);308 if (ret != 1)309 return NULL;310 311 jr = (union jr_entry *)jd->buf;312 313 switch(id) {314 case JIT_CODE_DEBUG_INFO:315 if (jd->needs_bswap) {316 uint64_t n;317 jr->info.code_addr = bswap_64(jr->info.code_addr);318 jr->info.nr_entry = bswap_64(jr->info.nr_entry);319 for (n = 0 ; n < jr->info.nr_entry; n++) {320 jr->info.entries[n].addr = bswap_64(jr->info.entries[n].addr);321 jr->info.entries[n].lineno = bswap_32(jr->info.entries[n].lineno);322 jr->info.entries[n].discrim = bswap_32(jr->info.entries[n].discrim);323 }324 }325 break;326 case JIT_CODE_UNWINDING_INFO:327 if (jd->needs_bswap) {328 jr->unwinding.unwinding_size = bswap_64(jr->unwinding.unwinding_size);329 jr->unwinding.eh_frame_hdr_size = bswap_64(jr->unwinding.eh_frame_hdr_size);330 jr->unwinding.mapped_size = bswap_64(jr->unwinding.mapped_size);331 }332 break;333 case JIT_CODE_CLOSE:334 break;335 case JIT_CODE_LOAD:336 if (jd->needs_bswap) {337 jr->load.pid = bswap_32(jr->load.pid);338 jr->load.tid = bswap_32(jr->load.tid);339 jr->load.vma = bswap_64(jr->load.vma);340 jr->load.code_addr = bswap_64(jr->load.code_addr);341 jr->load.code_size = bswap_64(jr->load.code_size);342 jr->load.code_index= bswap_64(jr->load.code_index);343 }344 jd->code_load_count++;345 break;346 case JIT_CODE_MOVE:347 if (jd->needs_bswap) {348 jr->move.pid = bswap_32(jr->move.pid);349 jr->move.tid = bswap_32(jr->move.tid);350 jr->move.vma = bswap_64(jr->move.vma);351 jr->move.old_code_addr = bswap_64(jr->move.old_code_addr);352 jr->move.new_code_addr = bswap_64(jr->move.new_code_addr);353 jr->move.code_size = bswap_64(jr->move.code_size);354 jr->move.code_index = bswap_64(jr->move.code_index);355 }356 break;357 case JIT_CODE_MAX:358 default:359 /* skip unknown record (we have read them) */360 break;361 }362 return jr;363}364 365static int366jit_inject_event(struct jit_buf_desc *jd, union perf_event *event)367{368 ssize_t size;369 370 size = perf_data__write(jd->output, event, event->header.size);371 if (size < 0)372 return -1;373 374 jd->bytes_written += size;375 return 0;376}377 378static pid_t jr_entry_pid(struct jit_buf_desc *jd, union jr_entry *jr)379{380 if (jd->nsi && nsinfo__in_pidns(jd->nsi))381 return nsinfo__tgid(jd->nsi);382 return jr->load.pid;383}384 385static pid_t jr_entry_tid(struct jit_buf_desc *jd, union jr_entry *jr)386{387 if (jd->nsi && nsinfo__in_pidns(jd->nsi))388 return nsinfo__pid(jd->nsi);389 return jr->load.tid;390}391 392static uint64_t convert_timestamp(struct jit_buf_desc *jd, uint64_t timestamp)393{394 struct perf_tsc_conversion tc = { .time_shift = 0, };395 struct perf_record_time_conv *time_conv = &jd->session->time_conv;396 397 if (!jd->use_arch_timestamp)398 return timestamp;399 400 tc.time_shift = time_conv->time_shift;401 tc.time_mult = time_conv->time_mult;402 tc.time_zero = time_conv->time_zero;403 404 /*405 * The event TIME_CONV was extended for the fields from "time_cycles"406 * when supported cap_user_time_short, for backward compatibility,407 * checks the event size and assigns these extended fields if these408 * fields are contained in the event.409 */410 if (event_contains(*time_conv, time_cycles)) {411 tc.time_cycles = time_conv->time_cycles;412 tc.time_mask = time_conv->time_mask;413 tc.cap_user_time_zero = time_conv->cap_user_time_zero;414 tc.cap_user_time_short = time_conv->cap_user_time_short;415 416 if (!tc.cap_user_time_zero)417 return 0;418 }419 420 return tsc_to_perf_time(timestamp, &tc);421}422 423static int jit_repipe_code_load(struct jit_buf_desc *jd, union jr_entry *jr)424{425 struct perf_sample sample;426 union perf_event *event;427 const struct perf_tool *tool = jd->session->tool;428 uint64_t code, addr;429 uintptr_t uaddr;430 char *filename;431 struct stat st;432 size_t size;433 u16 idr_size;434 const char *sym;435 uint64_t count;436 int ret, csize, usize;437 pid_t nspid, pid, tid;438 struct {439 u32 pid, tid;440 u64 time;441 } *id;442 443 nspid = jr->load.pid;444 pid = jr_entry_pid(jd, jr);445 tid = jr_entry_tid(jd, jr);446 csize = jr->load.code_size;447 usize = jd->unwinding_mapped_size;448 addr = jr->load.code_addr;449 sym = (void *)((unsigned long)jr + sizeof(jr->load));450 code = (unsigned long)jr + jr->load.p.total_size - csize;451 count = jr->load.code_index;452 idr_size = jd->machine->id_hdr_size;453 454 event = calloc(1, sizeof(*event) + idr_size);455 if (!event)456 return -1;457 458 filename = event->mmap2.filename;459 size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%" PRIu64 ".so",460 jd->dir,461 nspid,462 count);463 464 size++; /* for \0 */465 466 size = PERF_ALIGN(size, sizeof(u64));467 uaddr = (uintptr_t)code;468 ret = jit_emit_elf(jd, filename, sym, addr, (const void *)uaddr, csize, jd->debug_data, jd->nr_debug_entries,469 jd->unwinding_data, jd->eh_frame_hdr_size, jd->unwinding_size);470 471 if (jd->debug_data && jd->nr_debug_entries) {472 zfree(&jd->debug_data);473 jd->nr_debug_entries = 0;474 }475 476 if (jd->unwinding_data && jd->eh_frame_hdr_size) {477 zfree(&jd->unwinding_data);478 jd->eh_frame_hdr_size = 0;479 jd->unwinding_mapped_size = 0;480 jd->unwinding_size = 0;481 }482 483 if (ret) {484 free(event);485 return -1;486 }487 if (nsinfo__stat(filename, &st, jd->nsi))488 memset(&st, 0, sizeof(st));489 490 event->mmap2.header.type = PERF_RECORD_MMAP2;491 event->mmap2.header.misc = PERF_RECORD_MISC_USER;492 event->mmap2.header.size = (sizeof(event->mmap2) -493 (sizeof(event->mmap2.filename) - size) + idr_size);494 495 event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET;496 event->mmap2.start = addr;497 event->mmap2.len = usize ? ALIGN_8(csize) + usize : csize;498 event->mmap2.pid = pid;499 event->mmap2.tid = tid;500 event->mmap2.ino = st.st_ino;501 event->mmap2.maj = major(st.st_dev);502 event->mmap2.min = minor(st.st_dev);503 event->mmap2.prot = st.st_mode;504 event->mmap2.flags = MAP_SHARED;505 event->mmap2.ino_generation = 1;506 507 id = (void *)((unsigned long)event + event->mmap.header.size - idr_size);508 if (jd->sample_type & PERF_SAMPLE_TID) {509 id->pid = pid;510 id->tid = tid;511 }512 if (jd->sample_type & PERF_SAMPLE_TIME)513 id->time = convert_timestamp(jd, jr->load.p.timestamp);514 515 /*516 * create pseudo sample to induce dso hit increment517 * use first address as sample address518 */519 memset(&sample, 0, sizeof(sample));520 sample.cpumode = PERF_RECORD_MISC_USER;521 sample.pid = pid;522 sample.tid = tid;523 sample.time = id->time;524 sample.ip = addr;525 526 ret = perf_event__process_mmap2(tool, event, &sample, jd->machine);527 if (ret)528 goto out;529 530 ret = jit_inject_event(jd, event);531 /*532 * mark dso as use to generate buildid in the header533 */534 if (!ret)535 build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine);536 537out:538 free(event);539 return ret;540}541 542static int jit_repipe_code_move(struct jit_buf_desc *jd, union jr_entry *jr)543{544 struct perf_sample sample;545 union perf_event *event;546 const struct perf_tool *tool = jd->session->tool;547 char *filename;548 size_t size;549 struct stat st;550 int usize;551 u16 idr_size;552 int ret;553 pid_t nspid, pid, tid;554 struct {555 u32 pid, tid;556 u64 time;557 } *id;558 559 nspid = jr->load.pid;560 pid = jr_entry_pid(jd, jr);561 tid = jr_entry_tid(jd, jr);562 usize = jd->unwinding_mapped_size;563 idr_size = jd->machine->id_hdr_size;564 565 /*566 * +16 to account for sample_id_all (hack)567 */568 event = calloc(1, sizeof(*event) + 16);569 if (!event)570 return -1;571 572 filename = event->mmap2.filename;573 size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%" PRIu64 ".so",574 jd->dir,575 nspid,576 jr->move.code_index);577 578 size++; /* for \0 */579 580 if (nsinfo__stat(filename, &st, jd->nsi))581 memset(&st, 0, sizeof(st));582 583 size = PERF_ALIGN(size, sizeof(u64));584 585 event->mmap2.header.type = PERF_RECORD_MMAP2;586 event->mmap2.header.misc = PERF_RECORD_MISC_USER;587 event->mmap2.header.size = (sizeof(event->mmap2) -588 (sizeof(event->mmap2.filename) - size) + idr_size);589 event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET;590 event->mmap2.start = jr->move.new_code_addr;591 event->mmap2.len = usize ? ALIGN_8(jr->move.code_size) + usize592 : jr->move.code_size;593 event->mmap2.pid = pid;594 event->mmap2.tid = tid;595 event->mmap2.ino = st.st_ino;596 event->mmap2.maj = major(st.st_dev);597 event->mmap2.min = minor(st.st_dev);598 event->mmap2.prot = st.st_mode;599 event->mmap2.flags = MAP_SHARED;600 event->mmap2.ino_generation = 1;601 602 id = (void *)((unsigned long)event + event->mmap.header.size - idr_size);603 if (jd->sample_type & PERF_SAMPLE_TID) {604 id->pid = pid;605 id->tid = tid;606 }607 if (jd->sample_type & PERF_SAMPLE_TIME)608 id->time = convert_timestamp(jd, jr->load.p.timestamp);609 610 /*611 * create pseudo sample to induce dso hit increment612 * use first address as sample address613 */614 memset(&sample, 0, sizeof(sample));615 sample.cpumode = PERF_RECORD_MISC_USER;616 sample.pid = pid;617 sample.tid = tid;618 sample.time = id->time;619 sample.ip = jr->move.new_code_addr;620 621 ret = perf_event__process_mmap2(tool, event, &sample, jd->machine);622 if (ret)623 return ret;624 625 ret = jit_inject_event(jd, event);626 if (!ret)627 build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine);628 629 return ret;630}631 632static int jit_repipe_debug_info(struct jit_buf_desc *jd, union jr_entry *jr)633{634 void *data;635 size_t sz;636 637 if (!(jd && jr))638 return -1;639 640 sz = jr->prefix.total_size - sizeof(jr->info);641 data = malloc(sz);642 if (!data)643 return -1;644 645 memcpy(data, &jr->info.entries, sz);646 647 jd->debug_data = data;648 649 /*650 * we must use nr_entry instead of size here because651 * we cannot distinguish actual entry from padding otherwise652 */653 jd->nr_debug_entries = jr->info.nr_entry;654 655 return 0;656}657 658static int659jit_repipe_unwinding_info(struct jit_buf_desc *jd, union jr_entry *jr)660{661 void *unwinding_data;662 uint32_t unwinding_data_size;663 664 if (!(jd && jr))665 return -1;666 667 unwinding_data_size = jr->prefix.total_size - sizeof(jr->unwinding);668 unwinding_data = malloc(unwinding_data_size);669 if (!unwinding_data)670 return -1;671 672 memcpy(unwinding_data, &jr->unwinding.unwinding_data,673 unwinding_data_size);674 675 jd->eh_frame_hdr_size = jr->unwinding.eh_frame_hdr_size;676 jd->unwinding_size = jr->unwinding.unwinding_size;677 jd->unwinding_mapped_size = jr->unwinding.mapped_size;678 free(jd->unwinding_data);679 jd->unwinding_data = unwinding_data;680 681 return 0;682}683 684static int685jit_process_dump(struct jit_buf_desc *jd)686{687 union jr_entry *jr;688 int ret = 0;689 690 while ((jr = jit_get_next_entry(jd))) {691 switch(jr->prefix.id) {692 case JIT_CODE_LOAD:693 ret = jit_repipe_code_load(jd, jr);694 break;695 case JIT_CODE_MOVE:696 ret = jit_repipe_code_move(jd, jr);697 break;698 case JIT_CODE_DEBUG_INFO:699 ret = jit_repipe_debug_info(jd, jr);700 break;701 case JIT_CODE_UNWINDING_INFO:702 ret = jit_repipe_unwinding_info(jd, jr);703 break;704 default:705 ret = 0;706 continue;707 }708 }709 return ret;710}711 712static int713jit_inject(struct jit_buf_desc *jd, const char *path)714{715 int ret;716 717 if (verbose > 0)718 fprintf(stderr, "injecting: %s\n", path);719 720 ret = jit_open(jd, path);721 if (ret)722 return -1;723 724 ret = jit_process_dump(jd);725 726 jit_close(jd);727 728 if (verbose > 0)729 fprintf(stderr, "injected: %s (%d)\n", path, ret);730 731 return 0;732}733 734/*735 * File must be with pattern .../jit-XXXX.dump736 * where XXXX is the PID of the process which did the mmap()737 * as captured in the RECORD_MMAP record738 */739static int740jit_detect(const char *mmap_name, pid_t pid, struct nsinfo *nsi)741 {742 char *p;743 char *end = NULL;744 pid_t pid2;745 746 if (verbose > 2)747 fprintf(stderr, "jit marker trying : %s\n", mmap_name);748 /*749 * get file name750 */751 p = strrchr(mmap_name, '/');752 if (!p)753 return -1;754 755 /*756 * match prefix757 */758 if (strncmp(p, "/jit-", 5))759 return -1;760 761 /*762 * skip prefix763 */764 p += 5;765 766 /*767 * must be followed by a pid768 */769 if (!isdigit(*p))770 return -1;771 772 pid2 = (int)strtol(p, &end, 10);773 if (!end)774 return -1;775 776 /*777 * pid does not match mmap pid778 * pid==0 in system-wide mode (synthesized)779 */780 if (pid && pid2 != nsinfo__nstgid(nsi))781 return -1;782 /*783 * validate suffix784 */785 if (strcmp(end, ".dump"))786 return -1;787 788 if (verbose > 0)789 fprintf(stderr, "jit marker found: %s\n", mmap_name);790 791 return 0;792}793 794static void jit_add_pid(struct machine *machine, pid_t pid)795{796 struct thread *thread = machine__findnew_thread(machine, pid, pid);797 798 if (!thread) {799 pr_err("%s: thread %d not found or created\n", __func__, pid);800 return;801 }802 803 thread__set_priv(thread, (void *)true);804 thread__put(thread);805}806 807static bool jit_has_pid(struct machine *machine, pid_t pid)808{809 struct thread *thread = machine__find_thread(machine, pid, pid);810 void *priv;811 812 if (!thread)813 return false;814 815 priv = thread__priv(thread);816 thread__put(thread);817 return (bool)priv;818}819 820int821jit_process(struct perf_session *session,822 struct perf_data *output,823 struct machine *machine,824 const char *filename,825 pid_t pid,826 pid_t tid,827 u64 *nbytes)828{829 struct thread *thread;830 struct nsinfo *nsi;831 struct evsel *first;832 struct jit_buf_desc jd;833 int ret;834 835 thread = machine__findnew_thread(machine, pid, tid);836 if (thread == NULL) {837 pr_err("problem processing JIT mmap event, skipping it.\n");838 return 0;839 }840 841 nsi = nsinfo__get(thread__nsinfo(thread));842 thread__put(thread);843 844 /*845 * first, detect marker mmap (i.e., the jitdump mmap)846 */847 if (jit_detect(filename, pid, nsi)) {848 nsinfo__put(nsi);849 850 /*851 * Strip //anon*, [anon:* and /memfd:* mmaps if we processed a jitdump for this pid852 */853 if (jit_has_pid(machine, pid) &&854 ((strncmp(filename, "//anon", 6) == 0) ||855 (strncmp(filename, "[anon:", 6) == 0) ||856 (strncmp(filename, "/memfd:", 7) == 0)))857 return 1;858 859 return 0;860 }861 862 memset(&jd, 0, sizeof(jd));863 864 jd.session = session;865 jd.output = output;866 jd.machine = machine;867 jd.nsi = nsi;868 869 /*870 * track sample_type to compute id_all layout871 * perf sets the same sample type to all events as of now872 */873 first = evlist__first(session->evlist);874 jd.sample_type = first->core.attr.sample_type;875 876 *nbytes = 0;877 878 ret = jit_inject(&jd, filename);879 if (!ret) {880 jit_add_pid(machine, pid);881 *nbytes = jd.bytes_written;882 ret = 1;883 }884 885 nsinfo__put(jd.nsi);886 free(jd.buf);887 888 return ret;889}890