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                         char *execname = strchr(bf, '/');
 134
 135                         /* Catch VDSO */
 136                         if (execname == NULL)
 137                                 execname = strstr(bf, "[vdso]");
 138
 139                         if (execname == NULL)
 140                                 continue;
 141
 142                         size = strlen(execname);
 143                         execname[size - 1] = '\0'; /* Remove \n */
 144                         memcpy(ev.mmap.filename, execname, size);
 145                         size = ALIGN(size, sizeof(u64));
 146                         ev.mmap.len -= ev.mmap.start;
 147                         ev.mmap.header.size = (sizeof(ev.mmap) -
 148                                                (sizeof(ev.mmap.filename) - size));
 149                         ev.mmap.pid = tgid;
 150                         ev.mmap.tid = pid;
 151
 152                         process(&ev, session);
 153                 }
 154         }
 155
 156         fclose(fp);
 157         return 0;
 158 }
 159
 160 int event__synthesize_modules(event__handler_t process,
 161                               struct perf_session *session)
 162 {
 163         struct rb_node *nd;
 164
 165         for (nd = rb_first(&session->kmaps.maps[MAP__FUNCTION]);
 166              nd; nd = rb_next(nd)) {
 167                 event_t ev;
 168                 size_t size;
 169                 struct map *pos = rb_entry(nd, struct map, rb_node);
 170
 171                 if (pos->dso->kernel)
 172                         continue;
 173
 174                 size = ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 175                 memset(&ev, 0, sizeof(ev));
 176                 ev.mmap.header.misc = 1; /* kernel uses 0 for user space maps, see kernel/perf_event.c __perf_event_mmap */
 177                 ev.mmap.header.type = PERF_RECORD_MMAP;
 178                 ev.mmap.header.size = (sizeof(ev.mmap) -
 179                                         (sizeof(ev.mmap.filename) - size));
 180                 ev.mmap.start = pos->start;
 181                 ev.mmap.len   = pos->end - pos->start;
 182
 183                 memcpy(ev.mmap.filename, pos->dso->long_name,
 184                        pos->dso->long_name_len + 1);
 185                 process(&ev, session);
 186         }
 187
 188         return 0;
 189 }
 190
 191 int event__synthesize_thread(pid_t pid, event__handler_t process,
 192                              struct perf_session *session)
 193 {
 194         pid_t tgid = event__synthesize_comm(pid, 1, process, session);
 195         if (tgid == -1)
 196                 return -1;
 197         return event__synthesize_mmap_events(pid, tgid, process, session);
 198 }
 199
 200 void event__synthesize_threads(event__handler_t process,
 201                                struct perf_session *session)
 202 {
 203         DIR *proc;
 204         struct dirent dirent, *next;
 205
 206         proc = opendir("/proc");
 207
 208         while (!readdir_r(proc, &dirent, &next) && next) {
 209                 char *end;
 210                 pid_t pid = strtol(dirent.d_name, &end, 10);
 211
 212                 if (*end) /* only interested in proper numerical dirents */
 213                         continue;
 214
 215                 event__synthesize_thread(pid, process, session);
 216         }
 217
 218         closedir(proc);
 219 }
 220
 221 struct process_symbol_args {
 222         const char *name;
 223         u64        start;
 224 };
 225
 226 static int find_symbol_cb(void *arg, const char *name, char type, u64 start)
 227 {
 228         struct process_symbol_args *args = arg;
 229
 230         if (!symbol_type__is_a(type, MAP__FUNCTION) || strcmp(name, args->name))
 231                 return 0;
 232
 233         args->start = start;
 234         return 1;
 235 }
 236
 237 int event__synthesize_kernel_mmap(event__handler_t process,
 238                                   struct perf_session *session,
 239                                   const char *symbol_name)
 240 {
 241         size_t size;
 242         event_t ev = {
 243                 .header = {
 244                         .type = PERF_RECORD_MMAP,
 245                         .misc = 1, /* kernel uses 0 for user space maps, see kernel/perf_event.c __perf_event_mmap */
 246                 },
 247         };
 248         /*
 249          * We should get this from /sys/kernel/sections/.text, but till that is
 250          * available use this, and after it is use this as a fallback for older
 251          * kernels.
 252          */
 253         struct process_symbol_args args = { .name = symbol_name, };
 254
 255         if (kallsyms__parse("/proc/kallsyms", &args, find_symbol_cb) <= 0)
 256                 return -ENOENT;
 257
 258         size = snprintf(ev.mmap.filename, sizeof(ev.mmap.filename),
 259                         "[kernel.kallsyms.%s]", symbol_name) + 1;
 260         size = ALIGN(size, sizeof(u64));
 261         ev.mmap.header.size = (sizeof(ev.mmap) - (sizeof(ev.mmap.filename) - size));
 262         ev.mmap.pgoff = args.start;
 263         ev.mmap.start = session->vmlinux_maps[MAP__FUNCTION]->start;
 264         ev.mmap.len   = session->vmlinux_maps[MAP__FUNCTION]->end - ev.mmap.start ;
 265
 266         return process(&ev, session);
 267 }
 268
 269 static void thread__comm_adjust(struct thread *self)
 270 {
 271         char *comm = self->comm;
 272
 273         if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
 274             (!symbol_conf.comm_list ||
 275              strlist__has_entry(symbol_conf.comm_list, comm))) {
 276                 unsigned int slen = strlen(comm);
 277
 278                 if (slen > comms__col_width) {
 279                         comms__col_width = slen;
 280                         threads__col_width = slen + 6;
 281                 }
 282         }
 283 }
 284
 285 static int thread__set_comm_adjust(struct thread *self, const char *comm)
 286 {
 287         int ret = thread__set_comm(self, comm);
 288
 289         if (ret)
 290                 return ret;
 291
 292         thread__comm_adjust(self);
 293
 294         return 0;
 295 }
 296
 297 int event__process_comm(event_t *self, struct perf_session *session)
 298 {
 299         struct thread *thread = perf_session__findnew(session, self->comm.pid);
 300
 301         dump_printf(": %s:%d\n", self->comm.comm, self->comm.pid);
 302
 303         if (thread == NULL || thread__set_comm_adjust(thread, self->comm.comm)) {
 304                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
 305                 return -1;
 306         }
 307
 308         return 0;
 309 }
 310
 311 int event__process_lost(event_t *self, struct perf_session *session)
 312 {
 313         dump_printf(": id:%Ld: lost:%Ld\n", self->lost.id, self->lost.lost);
 314         session->events_stats.lost += self->lost.lost;
 315         return 0;
 316 }
 317
 318 int event__process_mmap(event_t *self, struct perf_session *session)
 319 {
 320         struct thread *thread;
 321         struct map *map;
 322
 323         dump_printf(" %d/%d: [%#Lx(%#Lx) @ %#Lx]: %s\n",
 324                     self->mmap.pid, self->mmap.tid, self->mmap.start,
 325                     self->mmap.len, self->mmap.pgoff, self->mmap.filename);
 326
 327         if (self->mmap.pid == 0) {
 328                 static const char kmmap_prefix[] = "[kernel.kallsyms.";
 329
 330                 if (self->mmap.filename[0] == '/') {
 331                         char short_module_name[1024];
 332                         char *name = strrchr(self->mmap.filename, '/'), *dot;
 333
 334                         if (name == NULL)
 335                                 goto out_problem;
 336
 337                         ++name; /* skip / */
 338                         dot = strrchr(name, '.');
 339                         if (dot == NULL)
 340                                 goto out_problem;
 341
 342                         snprintf(short_module_name, sizeof(short_module_name),
 343                                  "[%.*s]", (int)(dot - name), name);
 344                         strxfrchar(short_module_name, '-', '_');
 345
 346                         map = perf_session__new_module_map(session,
 347                                                            self->mmap.start,
 348                                                            short_module_name);
 349                         if (map == NULL)
 350                                 goto out_problem;
 351
 352                         name = strdup(self->mmap.filename);
 353                         if (name == NULL)
 354                                 goto out_problem;
 355
 356                         dso__set_long_name(map->dso, name);
 357                         map->end = map->start + self->mmap.len;
 358                 } else if (memcmp(self->mmap.filename, kmmap_prefix,
 359                                 sizeof(kmmap_prefix) - 1) == 0) {
 360                         const char *symbol_name = (self->mmap.filename +
 361                                                    sizeof(kmmap_prefix) - 1);
 362                         /*
 363                          * Should be there already, from the build-id table in
 364                          * the header.
 365                          */
 366                         struct dso *kernel = __dsos__findnew(&dsos__kernel,
 367                                                              "[kernel.kallsyms]");
 368                         if (kernel == NULL)
 369                                 goto out_problem;
 370
 371                         if (__map_groups__create_kernel_maps(&session->kmaps,
 372                                                              session->vmlinux_maps,
 373                                                              kernel) < 0)
 374                                 goto out_problem;
 375
 376                         session->vmlinux_maps[MAP__FUNCTION]->start = self->mmap.start;
 377                         session->vmlinux_maps[MAP__FUNCTION]->end   = self->mmap.start + self->mmap.len;
 378
 379                         perf_session__set_kallsyms_ref_reloc_sym(session, symbol_name,
 380                                                                  self->mmap.pgoff);
 381                 }
 382                 return 0;
 383         }
 384
 385         thread = perf_session__findnew(session, self->mmap.pid);
 386         map = map__new(&self->mmap, MAP__FUNCTION,
 387                        session->cwd, session->cwdlen);
 388
 389         if (thread == NULL || map == NULL)
 390                 goto out_problem;
 391
 392         thread__insert_map(thread, map);
 393         return 0;
 394
 395 out_problem:
 396         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
 397         return 0;
 398 }
 399
 400 int event__process_task(event_t *self, struct perf_session *session)
 401 {
 402         struct thread *thread = perf_session__findnew(session, self->fork.pid);
 403         struct thread *parent = perf_session__findnew(session, self->fork.ppid);
 404
 405         dump_printf("(%d:%d):(%d:%d)\n", self->fork.pid, self->fork.tid,
 406                     self->fork.ppid, self->fork.ptid);
 407         /*
 408          * A thread clone will have the same PID for both parent and child.
 409          */
 410         if (thread == parent)
 411                 return 0;
 412
 413         if (self->header.type == PERF_RECORD_EXIT)
 414                 return 0;
 415
 416         if (thread == NULL || parent == NULL ||
 417             thread__fork(thread, parent) < 0) {
 418                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
 419                 return -1;
 420         }
 421
 422         return 0;
 423 }
 424
 425 void thread__find_addr_location(struct thread *self,
 426                                 struct perf_session *session, u8 cpumode,
 427                                 enum map_type type, u64 addr,
 428                                 struct addr_location *al,
 429                                 symbol_filter_t filter)
 430 {
 431         struct map_groups *mg = &self->mg;
 432
 433         al->thread = self;
 434         al->addr = addr;
 435
 436         if (cpumode & PERF_RECORD_MISC_KERNEL) {
 437                 al->level = 'k';
 438                 mg = &session->kmaps;
 439         } else if (cpumode & PERF_RECORD_MISC_USER)
 440                 al->level = '.';
 441         else {
 442                 al->level = 'H';
 443                 al->map = NULL;
 444                 al->sym = NULL;
 445                 return;
 446         }
 447 try_again:
 448         al->map = map_groups__find(mg, type, al->addr);
 449         if (al->map == NULL) {
 450                 /*
 451                  * If this is outside of all known maps, and is a negative
 452                  * address, try to look it up in the kernel dso, as it might be
 453                  * a vsyscall or vdso (which executes in user-mode).
 454                  *
 455                  * XXX This is nasty, we should have a symbol list in the
 456                  * "[vdso]" dso, but for now lets use the old trick of looking
 457                  * in the whole kernel symbol list.
 458                  */
 459                 if ((long long)al->addr < 0 && mg != &session->kmaps) {
 460                         mg = &session->kmaps;
 461                         goto try_again;
 462                 }
 463                 al->sym = NULL;
 464         } else {
 465                 al->addr = al->map->map_ip(al->map, al->addr);
 466                 al->sym = map__find_symbol(al->map, session, al->addr, filter);
 467         }
 468 }
 469
 470 static void dso__calc_col_width(struct dso *self)
 471 {
 472         if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
 473             (!symbol_conf.dso_list ||
 474              strlist__has_entry(symbol_conf.dso_list, self->name))) {
 475                 unsigned int slen = strlen(self->name);
 476                 if (slen > dsos__col_width)
 477                         dsos__col_width = slen;
 478         }
 479
 480         self->slen_calculated = 1;
 481 }
 482
 483 int event__preprocess_sample(const event_t *self, struct perf_session *session,
 484                              struct addr_location *al, symbol_filter_t filter)
 485 {
 486         u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 487         struct thread *thread = perf_session__findnew(session, self->ip.pid);
 488
 489         if (thread == NULL)
 490                 return -1;
 491
 492         if (symbol_conf.comm_list &&
 493             !strlist__has_entry(symbol_conf.comm_list, thread->comm))
 494                 goto out_filtered;
 495
 496         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
 497
 498         thread__find_addr_location(thread, session, cpumode, MAP__FUNCTION,
 499                                    self->ip.ip, al, filter);
 500         dump_printf(" ...... dso: %s\n",
 501                     al->map ? al->map->dso->long_name :
 502                         al->level == 'H' ? "[hypervisor]" : "<not found>");
 503         /*
 504          * We have to do this here as we may have a dso with no symbol hit that
 505          * has a name longer than the ones with symbols sampled.
 506          */
 507         if (al->map && !sort_dso.elide && !al->map->dso->slen_calculated)
 508                 dso__calc_col_width(al->map->dso);
 509
 510         if (symbol_conf.dso_list &&
 511             (!al->map || !al->map->dso ||
 512              !(strlist__has_entry(symbol_conf.dso_list, al->map->dso->short_name) ||
 513                (al->map->dso->short_name != al->map->dso->long_name &&
 514                 strlist__has_entry(symbol_conf.dso_list, al->map->dso->long_name)))))
 515                 goto out_filtered;
 516
 517         if (symbol_conf.sym_list && al->sym &&
 518             !strlist__has_entry(symbol_conf.sym_list, al->sym->name))
 519                 goto out_filtered;
 520
 521         al->filtered = false;
 522         return 0;
 523
 524 out_filtered:
 525         al->filtered = true;
 526         return 0;
 527 }
 528
 529 int event__parse_sample(event_t *event, u64 type, struct sample_data *data)
 530 {
 531         u64 *array = event->sample.array;
 532
 533         if (type & PERF_SAMPLE_IP) {
 534                 data->ip = event->ip.ip;
 535                 array++;
 536         }
 537
 538         if (type & PERF_SAMPLE_TID) {
 539                 u32 *p = (u32 *)array;
 540                 data->pid = p[0];
 541                 data->tid = p[1];
 542                 array++;
 543         }
 544
 545         if (type & PERF_SAMPLE_TIME) {
 546                 data->time = *array;
 547                 array++;
 548         }
 549
 550         if (type & PERF_SAMPLE_ADDR) {
 551                 data->addr = *array;
 552                 array++;
 553         }
 554
 555         if (type & PERF_SAMPLE_ID) {
 556                 data->id = *array;
 557                 array++;
 558         }
 559
 560         if (type & PERF_SAMPLE_STREAM_ID) {
 561                 data->stream_id = *array;
 562                 array++;
 563         }
 564
 565         if (type & PERF_SAMPLE_CPU) {
 566                 u32 *p = (u32 *)array;
 567                 data->cpu = *p;
 568                 array++;
 569         }
 570
 571         if (type & PERF_SAMPLE_PERIOD) {
 572                 data->period = *array;
 573                 array++;
 574         }
 575
 576         if (type & PERF_SAMPLE_READ) {
 577                 pr_debug("PERF_SAMPLE_READ is unsuported for now\n");
 578                 return -1;
 579         }
 580
 581         if (type & PERF_SAMPLE_CALLCHAIN) {
 582                 data->callchain = (struct ip_callchain *)array;
 583                 array += 1 + data->callchain->nr;
 584         }
 585
 586         if (type & PERF_SAMPLE_RAW) {
 587                 u32 *p = (u32 *)array;
 588                 data->raw_size = *p;
 589                 p++;
 590                 data->raw_data = p;
 591         }
 592
 593         return 0;
 594 }