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 = { .type = PERF_RECORD_MMAP },
 114                 };
 115                 int n;
 116                 size_t size;
 117                 if (fgets(bf, sizeof(bf), fp) == NULL)
 118                         break;
 119
 120                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 121                 n = hex2u64(pbf, &ev.mmap.start);
 122                 if (n < 0)
 123                         continue;
 124                 pbf += n + 1;
 125                 n = hex2u64(pbf, &ev.mmap.len);
 126                 if (n < 0)
 127                         continue;
 128                 pbf += n + 3;
 129                 if (*pbf == 'x') { /* vm_exec */
 130                         char *execname = strchr(bf, '/');
 131
 132                         /* Catch VDSO */
 133                         if (execname == NULL)
 134                                 execname = strstr(bf, "[vdso]");
 135
 136                         if (execname == NULL)
 137                                 continue;
 138
 139                         size = strlen(execname);
 140                         execname[size - 1] = '\0'; /* Remove \n */
 141                         memcpy(ev.mmap.filename, execname, size);
 142                         size = ALIGN(size, sizeof(u64));
 143                         ev.mmap.len -= ev.mmap.start;
 144                         ev.mmap.header.size = (sizeof(ev.mmap) -
 145                                                (sizeof(ev.mmap.filename) - size));
 146                         ev.mmap.pid = tgid;
 147                         ev.mmap.tid = pid;
 148
 149                         process(&ev, session);
 150                 }
 151         }
 152
 153         fclose(fp);
 154         return 0;
 155 }
 156
 157 int event__synthesize_modules(event__handler_t process,
 158                               struct perf_session *session)
 159 {
 160         struct rb_node *nd;
 161
 162         for (nd = rb_first(&session->kmaps.maps[MAP__FUNCTION]);
 163              nd; nd = rb_next(nd)) {
 164                 event_t ev;
 165                 size_t size;
 166                 struct map *pos = rb_entry(nd, struct map, rb_node);
 167
 168                 if (pos->dso->kernel)
 169                         continue;
 170
 171                 size = ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 172                 memset(&ev, 0, sizeof(ev));
 173                 ev.mmap.header.type = PERF_RECORD_MMAP;
 174                 ev.mmap.header.size = (sizeof(ev.mmap) -
 175                                         (sizeof(ev.mmap.filename) - size));
 176                 ev.mmap.start = pos->start;
 177                 ev.mmap.len   = pos->end - pos->start;
 178
 179                 memcpy(ev.mmap.filename, pos->dso->long_name,
 180                        pos->dso->long_name_len + 1);
 181                 process(&ev, session);
 182         }
 183
 184         return 0;
 185 }
 186
 187 int event__synthesize_thread(pid_t pid, event__handler_t process,
 188                              struct perf_session *session)
 189 {
 190         pid_t tgid = event__synthesize_comm(pid, 1, process, session);
 191         if (tgid == -1)
 192                 return -1;
 193         return event__synthesize_mmap_events(pid, tgid, process, session);
 194 }
 195
 196 void event__synthesize_threads(event__handler_t process,
 197                                struct perf_session *session)
 198 {
 199         DIR *proc;
 200         struct dirent dirent, *next;
 201
 202         proc = opendir("/proc");
 203
 204         while (!readdir_r(proc, &dirent, &next) && next) {
 205                 char *end;
 206                 pid_t pid = strtol(dirent.d_name, &end, 10);
 207
 208                 if (*end) /* only interested in proper numerical dirents */
 209                         continue;
 210
 211                 event__synthesize_thread(pid, process, session);
 212         }
 213
 214         closedir(proc);
 215 }
 216
 217 struct process_symbol_args {
 218         const char *name;
 219         u64        start;
 220 };
 221
 222 static int find_symbol_cb(void *arg, const char *name, char type, u64 start)
 223 {
 224         struct process_symbol_args *args = arg;
 225
 226         if (!symbol_type__is_a(type, MAP__FUNCTION) || strcmp(name, args->name))
 227                 return 0;
 228
 229         args->start = start;
 230         return 1;
 231 }
 232
 233 int event__synthesize_kernel_mmap(event__handler_t process,
 234                                   struct perf_session *session,
 235                                   const char *symbol_name)
 236 {
 237         size_t size;
 238         event_t ev = {
 239                 .header = { .type = PERF_RECORD_MMAP },
 240         };
 241         /*
 242          * We should get this from /sys/kernel/sections/.text, but till that is
 243          * available use this, and after it is use this as a fallback for older
 244          * kernels.
 245          */
 246         struct process_symbol_args args = { .name = symbol_name, };
 247
 248         if (kallsyms__parse(&args, find_symbol_cb) <= 0)
 249                 return -ENOENT;
 250
 251         size = snprintf(ev.mmap.filename, sizeof(ev.mmap.filename),
 252                         "[kernel.kallsyms.%s]", symbol_name) + 1;
 253         size = ALIGN(size, sizeof(u64));
 254         ev.mmap.header.size = (sizeof(ev.mmap) - (sizeof(ev.mmap.filename) - size));
 255         ev.mmap.pgoff = args.start;
 256         ev.mmap.start = session->vmlinux_maps[MAP__FUNCTION]->start;
 257         ev.mmap.len   = session->vmlinux_maps[MAP__FUNCTION]->end - ev.mmap.start ;
 258
 259         return process(&ev, session);
 260 }
 261
 262 static void thread__comm_adjust(struct thread *self)
 263 {
 264         char *comm = self->comm;
 265
 266         if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
 267             (!symbol_conf.comm_list ||
 268              strlist__has_entry(symbol_conf.comm_list, comm))) {
 269                 unsigned int slen = strlen(comm);
 270
 271                 if (slen > comms__col_width) {
 272                         comms__col_width = slen;
 273                         threads__col_width = slen + 6;
 274                 }
 275         }
 276 }
 277
 278 static int thread__set_comm_adjust(struct thread *self, const char *comm)
 279 {
 280         int ret = thread__set_comm(self, comm);
 281
 282         if (ret)
 283                 return ret;
 284
 285         thread__comm_adjust(self);
 286
 287         return 0;
 288 }
 289
 290 int event__process_comm(event_t *self, struct perf_session *session)
 291 {
 292         struct thread *thread = perf_session__findnew(session, self->comm.pid);
 293
 294         dump_printf(": %s:%d\n", self->comm.comm, self->comm.pid);
 295
 296         if (thread == NULL || thread__set_comm_adjust(thread, self->comm.comm)) {
 297                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
 298                 return -1;
 299         }
 300
 301         return 0;
 302 }
 303
 304 int event__process_lost(event_t *self, struct perf_session *session)
 305 {
 306         dump_printf(": id:%Ld: lost:%Ld\n", self->lost.id, self->lost.lost);
 307         session->events_stats.lost += self->lost.lost;
 308         return 0;
 309 }
 310
 311 int event__process_mmap(event_t *self, struct perf_session *session)
 312 {
 313         struct thread *thread;
 314         struct map *map;
 315
 316         dump_printf(" %d/%d: [%#Lx(%#Lx) @ %#Lx]: %s\n",
 317                     self->mmap.pid, self->mmap.tid, self->mmap.start,
 318                     self->mmap.len, self->mmap.pgoff, self->mmap.filename);
 319
 320         if (self->mmap.pid == 0) {
 321                 static const char kmmap_prefix[] = "[kernel.kallsyms.";
 322
 323                 if (self->mmap.filename[0] == '/') {
 324                         char short_module_name[1024];
 325                         char *name = strrchr(self->mmap.filename, '/'), *dot;
 326
 327                         if (name == NULL)
 328                                 goto out_problem;
 329
 330                         ++name; /* skip / */
 331                         dot = strrchr(name, '.');
 332                         if (dot == NULL)
 333                                 goto out_problem;
 334
 335                         snprintf(short_module_name, sizeof(short_module_name),
 336                                  "[%.*s]", (int)(dot - name), name);
 337                         strxfrchar(short_module_name, '-', '_');
 338
 339                         map = perf_session__new_module_map(session,
 340                                                            self->mmap.start,
 341                                                            short_module_name);
 342                         if (map == NULL)
 343                                 goto out_problem;
 344
 345                         name = strdup(self->mmap.filename);
 346                         if (name == NULL)
 347                                 goto out_problem;
 348
 349                         dso__set_long_name(map->dso, name);
 350                         map->end = map->start + self->mmap.len;
 351                 } else if (memcmp(self->mmap.filename, kmmap_prefix,
 352                                 sizeof(kmmap_prefix) - 1) == 0) {
 353                         const char *symbol_name = (self->mmap.filename +
 354                                                    sizeof(kmmap_prefix) - 1);
 355                         /*
 356                          * Should be there already, from the build-id table in
 357                          * the header.
 358                          */
 359                         struct dso *kernel = __dsos__findnew(&dsos__kernel,
 360                                                              "[kernel.kallsyms]");
 361                         if (kernel == NULL)
 362                                 goto out_problem;
 363
 364                         if (__map_groups__create_kernel_maps(&session->kmaps,
 365                                                              session->vmlinux_maps,
 366                                                              kernel) < 0)
 367                                 goto out_problem;
 368
 369                         session->vmlinux_maps[MAP__FUNCTION]->start = self->mmap.start;
 370                         session->vmlinux_maps[MAP__FUNCTION]->end   = self->mmap.start + self->mmap.len;
 371
 372                         perf_session__set_kallsyms_ref_reloc_sym(session, symbol_name,
 373                                                                  self->mmap.pgoff);
 374                 }
 375                 return 0;
 376         }
 377
 378         thread = perf_session__findnew(session, self->mmap.pid);
 379         map = map__new(&self->mmap, MAP__FUNCTION,
 380                        session->cwd, session->cwdlen);
 381
 382         if (thread == NULL || map == NULL)
 383                 goto out_problem;
 384
 385         thread__insert_map(thread, map);
 386         return 0;
 387
 388 out_problem:
 389         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
 390         return 0;
 391 }
 392
 393 int event__process_task(event_t *self, struct perf_session *session)
 394 {
 395         struct thread *thread = perf_session__findnew(session, self->fork.pid);
 396         struct thread *parent = perf_session__findnew(session, self->fork.ppid);
 397
 398         dump_printf("(%d:%d):(%d:%d)\n", self->fork.pid, self->fork.tid,
 399                     self->fork.ppid, self->fork.ptid);
 400         /*
 401          * A thread clone will have the same PID for both parent and child.
 402          */
 403         if (thread == parent)
 404                 return 0;
 405
 406         if (self->header.type == PERF_RECORD_EXIT)
 407                 return 0;
 408
 409         if (thread == NULL || parent == NULL ||
 410             thread__fork(thread, parent) < 0) {
 411                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
 412                 return -1;
 413         }
 414
 415         return 0;
 416 }
 417
 418 void thread__find_addr_location(struct thread *self,
 419                                 struct perf_session *session, u8 cpumode,
 420                                 enum map_type type, u64 addr,
 421                                 struct addr_location *al,
 422                                 symbol_filter_t filter)
 423 {
 424         struct map_groups *mg = &self->mg;
 425
 426         al->thread = self;
 427         al->addr = addr;
 428
 429         if (cpumode & PERF_RECORD_MISC_KERNEL) {
 430                 al->level = 'k';
 431                 mg = &session->kmaps;
 432         } else if (cpumode & PERF_RECORD_MISC_USER)
 433                 al->level = '.';
 434         else {
 435                 al->level = 'H';
 436                 al->map = NULL;
 437                 al->sym = NULL;
 438                 return;
 439         }
 440 try_again:
 441         al->map = map_groups__find(mg, type, al->addr);
 442         if (al->map == NULL) {
 443                 /*
 444                  * If this is outside of all known maps, and is a negative
 445                  * address, try to look it up in the kernel dso, as it might be
 446                  * a vsyscall or vdso (which executes in user-mode).
 447                  *
 448                  * XXX This is nasty, we should have a symbol list in the
 449                  * "[vdso]" dso, but for now lets use the old trick of looking
 450                  * in the whole kernel symbol list.
 451                  */
 452                 if ((long long)al->addr < 0 && mg != &session->kmaps) {
 453                         mg = &session->kmaps;
 454                         goto try_again;
 455                 }
 456                 al->sym = NULL;
 457         } else {
 458                 al->addr = al->map->map_ip(al->map, al->addr);
 459                 al->sym = map__find_symbol(al->map, session, al->addr, filter);
 460         }
 461 }
 462
 463 static void dso__calc_col_width(struct dso *self)
 464 {
 465         if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
 466             (!symbol_conf.dso_list ||
 467              strlist__has_entry(symbol_conf.dso_list, self->name))) {
 468                 unsigned int slen = strlen(self->name);
 469                 if (slen > dsos__col_width)
 470                         dsos__col_width = slen;
 471         }
 472
 473         self->slen_calculated = 1;
 474 }
 475
 476 int event__preprocess_sample(const event_t *self, struct perf_session *session,
 477                              struct addr_location *al, symbol_filter_t filter)
 478 {
 479         u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 480         struct thread *thread = perf_session__findnew(session, self->ip.pid);
 481
 482         if (thread == NULL)
 483                 return -1;
 484
 485         if (symbol_conf.comm_list &&
 486             !strlist__has_entry(symbol_conf.comm_list, thread->comm))
 487                 goto out_filtered;
 488
 489         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
 490
 491         thread__find_addr_location(thread, session, cpumode, MAP__FUNCTION,
 492                                    self->ip.ip, al, filter);
 493         dump_printf(" ...... dso: %s\n",
 494                     al->map ? al->map->dso->long_name :
 495                         al->level == 'H' ? "[hypervisor]" : "<not found>");
 496         /*
 497          * We have to do this here as we may have a dso with no symbol hit that
 498          * has a name longer than the ones with symbols sampled.
 499          */
 500         if (al->map && !sort_dso.elide && !al->map->dso->slen_calculated)
 501                 dso__calc_col_width(al->map->dso);
 502
 503         if (symbol_conf.dso_list &&
 504             (!al->map || !al->map->dso ||
 505              !(strlist__has_entry(symbol_conf.dso_list, al->map->dso->short_name) ||
 506                (al->map->dso->short_name != al->map->dso->long_name &&
 507                 strlist__has_entry(symbol_conf.dso_list, al->map->dso->long_name)))))
 508                 goto out_filtered;
 509
 510         if (symbol_conf.sym_list && al->sym &&
 511             !strlist__has_entry(symbol_conf.sym_list, al->sym->name))
 512                 goto out_filtered;
 513
 514         al->filtered = false;
 515         return 0;
 516
 517 out_filtered:
 518         al->filtered = true;
 519         return 0;
 520 }
 521
 522 int event__parse_sample(event_t *event, u64 type, struct sample_data *data)
 523 {
 524         u64 *array = event->sample.array;
 525
 526         if (type & PERF_SAMPLE_IP) {
 527                 data->ip = event->ip.ip;
 528                 array++;
 529         }
 530
 531         if (type & PERF_SAMPLE_TID) {
 532                 u32 *p = (u32 *)array;
 533                 data->pid = p[0];
 534                 data->tid = p[1];
 535                 array++;
 536         }
 537
 538         if (type & PERF_SAMPLE_TIME) {
 539                 data->time = *array;
 540                 array++;
 541         }
 542
 543         if (type & PERF_SAMPLE_ADDR) {
 544                 data->addr = *array;
 545                 array++;
 546         }
 547
 548         if (type & PERF_SAMPLE_ID) {
 549                 data->id = *array;
 550                 array++;
 551         }
 552
 553         if (type & PERF_SAMPLE_STREAM_ID) {
 554                 data->stream_id = *array;
 555                 array++;
 556         }
 557
 558         if (type & PERF_SAMPLE_CPU) {
 559                 u32 *p = (u32 *)array;
 560                 data->cpu = *p;
 561                 array++;
 562         }
 563
 564         if (type & PERF_SAMPLE_PERIOD) {
 565                 data->period = *array;
 566                 array++;
 567         }
 568
 569         if (type & PERF_SAMPLE_READ) {
 570                 pr_debug("PERF_SAMPLE_READ is unsuported for now\n");
 571                 return -1;
 572         }
 573
 574         if (type & PERF_SAMPLE_CALLCHAIN) {
 575                 data->callchain = (struct ip_callchain *)array;
 576                 array += 1 + data->callchain->nr;
 577         }
 578
 579         if (type & PERF_SAMPLE_RAW) {
 580                 u32 *p = (u32 *)array;
 581                 data->raw_size = *p;
 582                 p++;
 583                 data->raw_data = p;
 584         }
 585
 586         return 0;
 587 }