tools/perf/util/event.c

   1 #include <linux/types.h>
   2 #include "event.h"
   3 #include "debug.h"
   4 #include "session.h"
   5 #include "sort.h"
   6 #include "string.h"
   7 #include "strlist.h"
   8 #include "thread.h"
   9
  10 static pid_t event__synthesize_comm(pid_t pid, int full,
  11                                     event__handler_t process,
  12                                     struct perf_session *session)
  13 {
  14         event_t ev;
  15         char filename[PATH_MAX];
  16         char bf[BUFSIZ];
  17         FILE *fp;
  18         size_t size = 0;
  19         DIR *tasks;
  20         struct dirent dirent, *next;
  21         pid_t tgid = 0;
  22
  23         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
  24
  25         fp = fopen(filename, "r");
  26         if (fp == NULL) {
  27 out_race:
  28                 /*
  29                  * We raced with a task exiting - just return:
  30                  */
  31                 pr_debug("couldn't open %s\n", filename);
  32                 return 0;
  33         }
  34
  35         memset(&ev.comm, 0, sizeof(ev.comm));
  36         while (!ev.comm.comm[0] || !ev.comm.pid) {
  37                 if (fgets(bf, sizeof(bf), fp) == NULL)
  38                         goto out_failure;
  39
  40                 if (memcmp(bf, "Name:", 5) == 0) {
  41                         char *name = bf + 5;
  42                         while (*name && isspace(*name))
  43                                 ++name;
  44                         size = strlen(name) - 1;
  45                         memcpy(ev.comm.comm, name, size++);
  46                 } else if (memcmp(bf, "Tgid:", 5) == 0) {
  47                         char *tgids = bf + 5;
  48                         while (*tgids && isspace(*tgids))
  49                                 ++tgids;
  50                         tgid = ev.comm.pid = atoi(tgids);
  51                 }
  52         }
  53
  54         ev.comm.header.type = PERF_RECORD_COMM;
  55         size = ALIGN(size, sizeof(u64));
  56         ev.comm.header.size = sizeof(ev.comm) - (sizeof(ev.comm.comm) - size);
  57
  58         if (!full) {
  59                 ev.comm.tid = pid;
  60
  61                 process(&ev, session);
  62                 goto out_fclose;
  63         }
  64
  65         snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
  66
  67         tasks = opendir(filename);
  68         if (tasks == NULL)
  69                 goto out_race;
  70
  71         while (!readdir_r(tasks, &dirent, &next) && next) {
  72                 char *end;
  73                 pid = strtol(dirent.d_name, &end, 10);
  74                 if (*end)
  75                         continue;
  76
  77                 ev.comm.tid = pid;
  78
  79                 process(&ev, session);
  80         }
  81         closedir(tasks);
  82
  83 out_fclose:
  84         fclose(fp);
  85         return tgid;
  86
  87 out_failure:
  88         pr_warning("couldn't get COMM and pgid, malformed %s\n", filename);
  89         return -1;
  90 }
  91
  92 static int event__synthesize_mmap_events(pid_t pid, pid_t tgid,
  93                                          event__handler_t process,
  94                                          struct perf_session *session)
  95 {
  96         char filename[PATH_MAX];
  97         FILE *fp;
  98
  99         snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
 100
 101         fp = fopen(filename, "r");
 102         if (fp == NULL) {
 103                 /*
 104                  * We raced with a task exiting - just return:
 105                  */
 106                 pr_debug("couldn't open %s\n", filename);
 107                 return -1;
 108         }
 109
 110         while (1) {
 111                 char bf[BUFSIZ], *pbf = bf;
 112                 event_t ev = {
 113                         .header = {
 114                                 .type = PERF_RECORD_MMAP,
 115                                 .misc = 0, /* Just like the kernel, see kernel/perf_event.c __perf_event_mmap */
 116                          },
 117                 };
 118                 int n;
 119                 size_t size;
 120                 if (fgets(bf, sizeof(bf), fp) == NULL)
 121                         break;
 122
 123                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 124                 n = hex2u64(pbf, &ev.mmap.start);
 125                 if (n < 0)
 126                         continue;
 127                 pbf += n + 1;
 128                 n = hex2u64(pbf, &ev.mmap.len);
 129                 if (n < 0)
 130                         continue;
 131                 pbf += n + 3;
 132                 if (*pbf == 'x') { /* vm_exec */
 133                         u64 vm_pgoff;
 134                         char *execname = strchr(bf, '/');
 135
 136                         /* Catch VDSO */
 137                         if (execname == NULL)
 138                                 execname = strstr(bf, "[vdso]");
 139
 140                         if (execname == NULL)
 141                                 continue;
 142
 143                         pbf += 3;
 144                         n = hex2u64(pbf, &vm_pgoff);
 145                         /* pgoff is in bytes, not pages */
 146                         if (n >= 0)
 147                                 ev.mmap.pgoff = vm_pgoff << getpagesize();
 148                         else
 149                                 ev.mmap.pgoff = 0;
 150
 151                         size = strlen(execname);
 152                         execname[size - 1] = '\0'; /* Remove \n */
 153                         memcpy(ev.mmap.filename, execname, size);
 154                         size = ALIGN(size, sizeof(u64));
 155                         ev.mmap.len -= ev.mmap.start;
 156                         ev.mmap.header.size = (sizeof(ev.mmap) -
 157                                                (sizeof(ev.mmap.filename) - size));
 158                         ev.mmap.pid = tgid;
 159                         ev.mmap.tid = pid;
 160
 161                         process(&ev, session);
 162                 }
 163         }
 164
 165         fclose(fp);
 166         return 0;
 167 }
 168
 169 int event__synthesize_modules(event__handler_t process,
 170                               struct perf_session *session)
 171 {
 172         struct rb_node *nd;
 173
 174         for (nd = rb_first(&session->kmaps.maps[MAP__FUNCTION]);
 175              nd; nd = rb_next(nd)) {
 176                 event_t ev;
 177                 size_t size;
 178                 struct map *pos = rb_entry(nd, struct map, rb_node);
 179
 180                 if (pos->dso->kernel)
 181                         continue;
 182
 183                 size = ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 184                 memset(&ev, 0, sizeof(ev));
 185                 ev.mmap.header.misc = 1; /* kernel uses 0 for user space maps, see kernel/perf_event.c __perf_event_mmap */
 186                 ev.mmap.header.type = PERF_RECORD_MMAP;
 187                 ev.mmap.header.size = (sizeof(ev.mmap) -
 188                                         (sizeof(ev.mmap.filename) - size));
 189                 ev.mmap.start = pos->start;
 190                 ev.mmap.len   = pos->end - pos->start;
 191
 192                 memcpy(ev.mmap.filename, pos->dso->long_name,
 193                        pos->dso->long_name_len + 1);
 194                 process(&ev, session);
 195         }
 196
 197         return 0;
 198 }
 199
 200 int event__synthesize_thread(pid_t pid, event__handler_t process,
 201                              struct perf_session *session)
 202 {
 203         pid_t tgid = event__synthesize_comm(pid, 1, process, session);
 204         if (tgid == -1)
 205                 return -1;
 206         return event__synthesize_mmap_events(pid, tgid, process, session);
 207 }
 208
 209 void event__synthesize_threads(event__handler_t process,
 210                                struct perf_session *session)
 211 {
 212         DIR *proc;
 213         struct dirent dirent, *next;
 214
 215         proc = opendir("/proc");
 216
 217         while (!readdir_r(proc, &dirent, &next) && next) {
 218                 char *end;
 219                 pid_t pid = strtol(dirent.d_name, &end, 10);
 220
 221                 if (*end) /* only interested in proper numerical dirents */
 222                         continue;
 223
 224                 event__synthesize_thread(pid, process, session);
 225         }
 226
 227         closedir(proc);
 228 }
 229
 230 struct process_symbol_args {
 231         const char *name;
 232         u64        start;
 233 };
 234
 235 static int find_symbol_cb(void *arg, const char *name, char type, u64 start)
 236 {
 237         struct process_symbol_args *args = arg;
 238
 239         /*
 240          * Must be a function or at least an alias, as in PARISC64, where "_text" is
 241          * an 'A' to the same address as "_stext".
 242          */
 243         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
 244               type == 'A') || strcmp(name, args->name))
 245                 return 0;
 246
 247         args->start = start;
 248         return 1;
 249 }
 250
 251 int event__synthesize_kernel_mmap(event__handler_t process,
 252                                   struct perf_session *session,
 253                                   const char *symbol_name)
 254 {
 255         size_t size;
 256         event_t ev = {
 257                 .header = {
 258                         .type = PERF_RECORD_MMAP,
 259                         .misc = 1, /* kernel uses 0 for user space maps, see kernel/perf_event.c __perf_event_mmap */
 260                 },
 261         };
 262         /*
 263          * We should get this from /sys/kernel/sections/.text, but till that is
 264          * available use this, and after it is use this as a fallback for older
 265          * kernels.
 266          */
 267         struct process_symbol_args args = { .name = symbol_name, };
 268
 269         if (kallsyms__parse("/proc/kallsyms", &args, find_symbol_cb) <= 0)
 270                 return -ENOENT;
 271
 272         size = snprintf(ev.mmap.filename, sizeof(ev.mmap.filename),
 273                         "[kernel.kallsyms.%s]", symbol_name) + 1;
 274         size = ALIGN(size, sizeof(u64));
 275         ev.mmap.header.size = (sizeof(ev.mmap) - (sizeof(ev.mmap.filename) - size));
 276         ev.mmap.pgoff = args.start;
 277         ev.mmap.start = session->vmlinux_maps[MAP__FUNCTION]->start;
 278         ev.mmap.len   = session->vmlinux_maps[MAP__FUNCTION]->end - ev.mmap.start ;
 279
 280         return process(&ev, session);
 281 }
 282
 283 static void thread__comm_adjust(struct thread *self)
 284 {
 285         char *comm = self->comm;
 286
 287         if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
 288             (!symbol_conf.comm_list ||
 289              strlist__has_entry(symbol_conf.comm_list, comm))) {
 290                 unsigned int slen = strlen(comm);
 291
 292                 if (slen > comms__col_width) {
 293                         comms__col_width = slen;
 294                         threads__col_width = slen + 6;
 295                 }
 296         }
 297 }
 298
 299 static int thread__set_comm_adjust(struct thread *self, const char *comm)
 300 {
 301         int ret = thread__set_comm(self, comm);
 302
 303         if (ret)
 304                 return ret;
 305
 306         thread__comm_adjust(self);
 307
 308         return 0;
 309 }
 310
 311 int event__process_comm(event_t *self, struct perf_session *session)
 312 {
 313         struct thread *thread = perf_session__findnew(session, self->comm.pid);
 314
 315         dump_printf(": %s:%d\n", self->comm.comm, self->comm.pid);
 316
 317         if (thread == NULL || thread__set_comm_adjust(thread, self->comm.comm)) {
 318                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
 319                 return -1;
 320         }
 321
 322         return 0;
 323 }
 324
 325 int event__process_lost(event_t *self, struct perf_session *session)
 326 {
 327         dump_printf(": id:%Ld: lost:%Ld\n", self->lost.id, self->lost.lost);
 328         session->events_stats.lost += self->lost.lost;
 329         return 0;
 330 }
 331
 332 int event__process_mmap(event_t *self, struct perf_session *session)
 333 {
 334         struct thread *thread;
 335         struct map *map;
 336
 337         dump_printf(" %d/%d: [%#Lx(%#Lx) @ %#Lx]: %s\n",
 338                     self->mmap.pid, self->mmap.tid, self->mmap.start,
 339                     self->mmap.len, self->mmap.pgoff, self->mmap.filename);
 340
 341         if (self->mmap.pid == 0) {
 342                 static const char kmmap_prefix[] = "[kernel.kallsyms.";
 343
 344                 if (self->mmap.filename[0] == '/') {
 345                         char short_module_name[1024];
 346                         char *name = strrchr(self->mmap.filename, '/'), *dot;
 347
 348                         if (name == NULL)
 349                                 goto out_problem;
 350
 351                         ++name; /* skip / */
 352                         dot = strrchr(name, '.');
 353                         if (dot == NULL)
 354                                 goto out_problem;
 355
 356                         snprintf(short_module_name, sizeof(short_module_name),
 357                                  "[%.*s]", (int)(dot - name), name);
 358                         strxfrchar(short_module_name, '-', '_');
 359
 360                         map = perf_session__new_module_map(session,
 361                                                            self->mmap.start,
 362                                                            self->mmap.filename);
 363                         if (map == NULL)
 364                                 goto out_problem;
 365
 366                         name = strdup(short_module_name);
 367                         if (name == NULL)
 368                                 goto out_problem;
 369
 370                         map->dso->short_name = name;
 371                         map->end = map->start + self->mmap.len;
 372                 } else if (memcmp(self->mmap.filename, kmmap_prefix,
 373                                 sizeof(kmmap_prefix) - 1) == 0) {
 374                         const char *symbol_name = (self->mmap.filename +
 375                                                    sizeof(kmmap_prefix) - 1);
 376                         /*
 377                          * Should be there already, from the build-id table in
 378                          * the header.
 379                          */
 380                         struct dso *kernel = __dsos__findnew(&dsos__kernel,
 381                                                              "[kernel.kallsyms]");
 382                         if (kernel == NULL)
 383                                 goto out_problem;
 384
 385                         kernel->kernel = 1;
 386                         if (__perf_session__create_kernel_maps(session, kernel) < 0)
 387                                 goto out_problem;
 388
 389                         session->vmlinux_maps[MAP__FUNCTION]->start = self->mmap.start;
 390                         session->vmlinux_maps[MAP__FUNCTION]->end   = self->mmap.start + self->mmap.len;
 391                         /*
 392                          * Be a bit paranoid here, some perf.data file came with
 393                          * a zero sized synthesized MMAP event for the kernel.
 394                          */
 395                         if (session->vmlinux_maps[MAP__FUNCTION]->end == 0)
 396                                 session->vmlinux_maps[MAP__FUNCTION]->end = ~0UL;
 397
 398                         perf_session__set_kallsyms_ref_reloc_sym(session, symbol_name,
 399                                                                  self->mmap.pgoff);
 400                 }
 401                 return 0;
 402         }
 403
 404         thread = perf_session__findnew(session, self->mmap.pid);
 405         map = map__new(self->mmap.start, self->mmap.len, self->mmap.pgoff,
 406                        self->mmap.pid, self->mmap.filename, MAP__FUNCTION,
 407                        session->cwd, session->cwdlen);
 408
 409         if (thread == NULL || map == NULL)
 410                 goto out_problem;
 411
 412         thread__insert_map(thread, map);
 413         return 0;
 414
 415 out_problem:
 416         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
 417         return 0;
 418 }
 419
 420 int event__process_task(event_t *self, struct perf_session *session)
 421 {
 422         struct thread *thread = perf_session__findnew(session, self->fork.pid);
 423         struct thread *parent = perf_session__findnew(session, self->fork.ppid);
 424
 425         dump_printf("(%d:%d):(%d:%d)\n", self->fork.pid, self->fork.tid,
 426                     self->fork.ppid, self->fork.ptid);
 427         /*
 428          * A thread clone will have the same PID for both parent and child.
 429          */
 430         if (thread == parent)
 431                 return 0;
 432
 433         if (self->header.type == PERF_RECORD_EXIT)
 434                 return 0;
 435
 436         if (thread == NULL || parent == NULL ||
 437             thread__fork(thread, parent) < 0) {
 438                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
 439                 return -1;
 440         }
 441
 442         return 0;
 443 }
 444
 445 void thread__find_addr_map(struct thread *self,
 446                            struct perf_session *session, u8 cpumode,
 447                            enum map_type type, u64 addr,
 448                            struct addr_location *al)
 449 {
 450         struct map_groups *mg = &self->mg;
 451
 452         al->thread = self;
 453         al->addr = addr;
 454
 455         if (cpumode == PERF_RECORD_MISC_KERNEL) {
 456                 al->level = 'k';
 457                 mg = &session->kmaps;
 458         } else if (cpumode == PERF_RECORD_MISC_USER)
 459                 al->level = '.';
 460         else {
 461                 al->level = 'H';
 462                 al->map = NULL;
 463                 return;
 464         }
 465 try_again:
 466         al->map = map_groups__find(mg, type, al->addr);
 467         if (al->map == NULL) {
 468                 /*
 469                  * If this is outside of all known maps, and is a negative
 470                  * address, try to look it up in the kernel dso, as it might be
 471                  * a vsyscall or vdso (which executes in user-mode).
 472                  *
 473                  * XXX This is nasty, we should have a symbol list in the
 474                  * "[vdso]" dso, but for now lets use the old trick of looking
 475                  * in the whole kernel symbol list.
 476                  */
 477                 if ((long long)al->addr < 0 && mg != &session->kmaps) {
 478                         mg = &session->kmaps;
 479                         goto try_again;
 480                 }
 481         } else
 482                 al->addr = al->map->map_ip(al->map, al->addr);
 483 }
 484
 485 void thread__find_addr_location(struct thread *self,
 486                                 struct perf_session *session, u8 cpumode,
 487                                 enum map_type type, u64 addr,
 488                                 struct addr_location *al,
 489                                 symbol_filter_t filter)
 490 {
 491         thread__find_addr_map(self, session, cpumode, type, addr, al);
 492         if (al->map != NULL)
 493                 al->sym = map__find_symbol(al->map, al->addr, filter);
 494         else
 495                 al->sym = NULL;
 496 }
 497
 498 static void dso__calc_col_width(struct dso *self)
 499 {
 500         if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
 501             (!symbol_conf.dso_list ||
 502              strlist__has_entry(symbol_conf.dso_list, self->name))) {
 503                 unsigned int slen = strlen(self->name);
 504                 if (slen > dsos__col_width)
 505                         dsos__col_width = slen;
 506         }
 507
 508         self->slen_calculated = 1;
 509 }
 510
 511 int event__preprocess_sample(const event_t *self, struct perf_session *session,
 512                              struct addr_location *al, symbol_filter_t filter)
 513 {
 514         u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 515         struct thread *thread = perf_session__findnew(session, self->ip.pid);
 516
 517         if (thread == NULL)
 518                 return -1;
 519
 520         if (symbol_conf.comm_list &&
 521             !strlist__has_entry(symbol_conf.comm_list, thread->comm))
 522                 goto out_filtered;
 523
 524         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
 525
 526         thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
 527                               self->ip.ip, al);
 528         dump_printf(" ...... dso: %s\n",
 529                     al->map ? al->map->dso->long_name :
 530                         al->level == 'H' ? "[hypervisor]" : "<not found>");
 531         al->sym = NULL;
 532
 533         if (al->map) {
 534                 if (symbol_conf.dso_list &&
 535                     (!al->map || !al->map->dso ||
 536                      !(strlist__has_entry(symbol_conf.dso_list,
 537                                           al->map->dso->short_name) ||
 538                        (al->map->dso->short_name != al->map->dso->long_name &&
 539                         strlist__has_entry(symbol_conf.dso_list,
 540                                            al->map->dso->long_name)))))
 541                         goto out_filtered;
 542                 /*
 543                  * We have to do this here as we may have a dso with no symbol
 544                  * hit that has a name longer than the ones with symbols
 545                  * sampled.
 546                  */
 547                 if (!sort_dso.elide && !al->map->dso->slen_calculated)
 548                         dso__calc_col_width(al->map->dso);
 549
 550                 al->sym = map__find_symbol(al->map, al->addr, filter);
 551         }
 552
 553         if (symbol_conf.sym_list && al->sym &&
 554             !strlist__has_entry(symbol_conf.sym_list, al->sym->name))
 555                 goto out_filtered;
 556
 557         al->filtered = false;
 558         return 0;
 559
 560 out_filtered:
 561         al->filtered = true;
 562         return 0;
 563 }
 564
 565 int event__parse_sample(event_t *event, u64 type, struct sample_data *data)
 566 {
 567         u64 *array = event->sample.array;
 568
 569         if (type & PERF_SAMPLE_IP) {
 570                 data->ip = event->ip.ip;
 571                 array++;
 572         }
 573
 574         if (type & PERF_SAMPLE_TID) {
 575                 u32 *p = (u32 *)array;
 576                 data->pid = p[0];
 577                 data->tid = p[1];
 578                 array++;
 579         }
 580
 581         if (type & PERF_SAMPLE_TIME) {
 582                 data->time = *array;
 583                 array++;
 584         }
 585
 586         if (type & PERF_SAMPLE_ADDR) {
 587                 data->addr = *array;
 588                 array++;
 589         }
 590
 591         if (type & PERF_SAMPLE_ID) {
 592                 data->id = *array;
 593                 array++;
 594         }
 595
 596         if (type & PERF_SAMPLE_STREAM_ID) {
 597                 data->stream_id = *array;
 598                 array++;
 599         }
 600
 601         if (type & PERF_SAMPLE_CPU) {
 602                 u32 *p = (u32 *)array;
 603                 data->cpu = *p;
 604                 array++;
 605         }
 606
 607         if (type & PERF_SAMPLE_PERIOD) {
 608                 data->period = *array;
 609                 array++;
 610         }
 611
 612         if (type & PERF_SAMPLE_READ) {
 613                 pr_debug("PERF_SAMPLE_READ is unsuported for now\n");
 614                 return -1;
 615         }
 616
 617         if (type & PERF_SAMPLE_CALLCHAIN) {
 618                 data->callchain = (struct ip_callchain *)array;
 619                 array += 1 + data->callchain->nr;
 620         }
 621
 622         if (type & PERF_SAMPLE_RAW) {
 623                 u32 *p = (u32 *)array;
 624                 data->raw_size = *p;
 625                 p++;
 626                 data->raw_data = p;
 627         }
 628
 629         return 0;
 630 }