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         /*
 231          * Must be a function or at least an alias, as in PARISC64, where "_text" is
 232          * an 'A' to the same address as "_stext".
 233          */
 234         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
 235               type == 'A') || strcmp(name, args->name))
 236                 return 0;
 237
 238         args->start = start;
 239         return 1;
 240 }
 241
 242 int event__synthesize_kernel_mmap(event__handler_t process,
 243                                   struct perf_session *session,
 244                                   const char *symbol_name)
 245 {
 246         size_t size;
 247         event_t ev = {
 248                 .header = {
 249                         .type = PERF_RECORD_MMAP,
 250                         .misc = 1, /* kernel uses 0 for user space maps, see kernel/perf_event.c __perf_event_mmap */
 251                 },
 252         };
 253         /*
 254          * We should get this from /sys/kernel/sections/.text, but till that is
 255          * available use this, and after it is use this as a fallback for older
 256          * kernels.
 257          */
 258         struct process_symbol_args args = { .name = symbol_name, };
 259
 260         if (kallsyms__parse("/proc/kallsyms", &args, find_symbol_cb) <= 0)
 261                 return -ENOENT;
 262
 263         size = snprintf(ev.mmap.filename, sizeof(ev.mmap.filename),
 264                         "[kernel.kallsyms.%s]", symbol_name) + 1;
 265         size = ALIGN(size, sizeof(u64));
 266         ev.mmap.header.size = (sizeof(ev.mmap) - (sizeof(ev.mmap.filename) - size));
 267         ev.mmap.pgoff = args.start;
 268         ev.mmap.start = session->vmlinux_maps[MAP__FUNCTION]->start;
 269         ev.mmap.len   = session->vmlinux_maps[MAP__FUNCTION]->end - ev.mmap.start ;
 270
 271         return process(&ev, session);
 272 }
 273
 274 static void thread__comm_adjust(struct thread *self)
 275 {
 276         char *comm = self->comm;
 277
 278         if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
 279             (!symbol_conf.comm_list ||
 280              strlist__has_entry(symbol_conf.comm_list, comm))) {
 281                 unsigned int slen = strlen(comm);
 282
 283                 if (slen > comms__col_width) {
 284                         comms__col_width = slen;
 285                         threads__col_width = slen + 6;
 286                 }
 287         }
 288 }
 289
 290 static int thread__set_comm_adjust(struct thread *self, const char *comm)
 291 {
 292         int ret = thread__set_comm(self, comm);
 293
 294         if (ret)
 295                 return ret;
 296
 297         thread__comm_adjust(self);
 298
 299         return 0;
 300 }
 301
 302 int event__process_comm(event_t *self, struct perf_session *session)
 303 {
 304         struct thread *thread = perf_session__findnew(session, self->comm.pid);
 305
 306         dump_printf(": %s:%d\n", self->comm.comm, self->comm.pid);
 307
 308         if (thread == NULL || thread__set_comm_adjust(thread, self->comm.comm)) {
 309                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
 310                 return -1;
 311         }
 312
 313         return 0;
 314 }
 315
 316 int event__process_lost(event_t *self, struct perf_session *session)
 317 {
 318         dump_printf(": id:%Ld: lost:%Ld\n", self->lost.id, self->lost.lost);
 319         session->events_stats.lost += self->lost.lost;
 320         return 0;
 321 }
 322
 323 int event__process_mmap(event_t *self, struct perf_session *session)
 324 {
 325         struct thread *thread;
 326         struct map *map;
 327
 328         dump_printf(" %d/%d: [%#Lx(%#Lx) @ %#Lx]: %s\n",
 329                     self->mmap.pid, self->mmap.tid, self->mmap.start,
 330                     self->mmap.len, self->mmap.pgoff, self->mmap.filename);
 331
 332         if (self->mmap.pid == 0) {
 333                 static const char kmmap_prefix[] = "[kernel.kallsyms.";
 334
 335                 if (self->mmap.filename[0] == '/') {
 336                         char short_module_name[1024];
 337                         char *name = strrchr(self->mmap.filename, '/'), *dot;
 338
 339                         if (name == NULL)
 340                                 goto out_problem;
 341
 342                         ++name; /* skip / */
 343                         dot = strrchr(name, '.');
 344                         if (dot == NULL)
 345                                 goto out_problem;
 346
 347                         snprintf(short_module_name, sizeof(short_module_name),
 348                                  "[%.*s]", (int)(dot - name), name);
 349                         strxfrchar(short_module_name, '-', '_');
 350
 351                         map = perf_session__new_module_map(session,
 352                                                            self->mmap.start,
 353                                                            self->mmap.filename);
 354                         if (map == NULL)
 355                                 goto out_problem;
 356
 357                         name = strdup(short_module_name);
 358                         if (name == NULL)
 359                                 goto out_problem;
 360
 361                         map->dso->short_name = name;
 362                         map->end = map->start + self->mmap.len;
 363                 } else if (memcmp(self->mmap.filename, kmmap_prefix,
 364                                 sizeof(kmmap_prefix) - 1) == 0) {
 365                         const char *symbol_name = (self->mmap.filename +
 366                                                    sizeof(kmmap_prefix) - 1);
 367                         /*
 368                          * Should be there already, from the build-id table in
 369                          * the header.
 370                          */
 371                         struct dso *kernel = __dsos__findnew(&dsos__kernel,
 372                                                              "[kernel.kallsyms]");
 373                         if (kernel == NULL)
 374                                 goto out_problem;
 375
 376                         if (__map_groups__create_kernel_maps(&session->kmaps,
 377                                                              session->vmlinux_maps,
 378                                                              kernel) < 0)
 379                                 goto out_problem;
 380
 381                         session->vmlinux_maps[MAP__FUNCTION]->start = self->mmap.start;
 382                         session->vmlinux_maps[MAP__FUNCTION]->end   = self->mmap.start + self->mmap.len;
 383
 384                         perf_session__set_kallsyms_ref_reloc_sym(session, symbol_name,
 385                                                                  self->mmap.pgoff);
 386                 }
 387                 return 0;
 388         }
 389
 390         thread = perf_session__findnew(session, self->mmap.pid);
 391         map = map__new(&self->mmap, MAP__FUNCTION,
 392                        session->cwd, session->cwdlen);
 393
 394         if (thread == NULL || map == NULL)
 395                 goto out_problem;
 396
 397         thread__insert_map(thread, map);
 398         return 0;
 399
 400 out_problem:
 401         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
 402         return 0;
 403 }
 404
 405 int event__process_task(event_t *self, struct perf_session *session)
 406 {
 407         struct thread *thread = perf_session__findnew(session, self->fork.pid);
 408         struct thread *parent = perf_session__findnew(session, self->fork.ppid);
 409
 410         dump_printf("(%d:%d):(%d:%d)\n", self->fork.pid, self->fork.tid,
 411                     self->fork.ppid, self->fork.ptid);
 412         /*
 413          * A thread clone will have the same PID for both parent and child.
 414          */
 415         if (thread == parent)
 416                 return 0;
 417
 418         if (self->header.type == PERF_RECORD_EXIT)
 419                 return 0;
 420
 421         if (thread == NULL || parent == NULL ||
 422             thread__fork(thread, parent) < 0) {
 423                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
 424                 return -1;
 425         }
 426
 427         return 0;
 428 }
 429
 430 void thread__find_addr_map(struct thread *self,
 431                            struct perf_session *session, u8 cpumode,
 432                            enum map_type type, u64 addr,
 433                            struct addr_location *al)
 434 {
 435         struct map_groups *mg = &self->mg;
 436
 437         al->thread = self;
 438         al->addr = addr;
 439
 440         if (cpumode & PERF_RECORD_MISC_KERNEL) {
 441                 al->level = 'k';
 442                 mg = &session->kmaps;
 443         } else if (cpumode & PERF_RECORD_MISC_USER)
 444                 al->level = '.';
 445         else {
 446                 al->level = 'H';
 447                 al->map = NULL;
 448                 return;
 449         }
 450 try_again:
 451         al->map = map_groups__find(mg, type, al->addr);
 452         if (al->map == NULL) {
 453                 /*
 454                  * If this is outside of all known maps, and is a negative
 455                  * address, try to look it up in the kernel dso, as it might be
 456                  * a vsyscall or vdso (which executes in user-mode).
 457                  *
 458                  * XXX This is nasty, we should have a symbol list in the
 459                  * "[vdso]" dso, but for now lets use the old trick of looking
 460                  * in the whole kernel symbol list.
 461                  */
 462                 if ((long long)al->addr < 0 && mg != &session->kmaps) {
 463                         mg = &session->kmaps;
 464                         goto try_again;
 465                 }
 466         } else
 467                 al->addr = al->map->map_ip(al->map, al->addr);
 468 }
 469
 470 void thread__find_addr_location(struct thread *self,
 471                                 struct perf_session *session, u8 cpumode,
 472                                 enum map_type type, u64 addr,
 473                                 struct addr_location *al,
 474                                 symbol_filter_t filter)
 475 {
 476         thread__find_addr_map(self, session, cpumode, type, addr, al);
 477         if (al->map != NULL)
 478                 al->sym = map__find_symbol(al->map, session, al->addr, filter);
 479         else
 480                 al->sym = NULL;
 481 }
 482
 483 static void dso__calc_col_width(struct dso *self)
 484 {
 485         if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
 486             (!symbol_conf.dso_list ||
 487              strlist__has_entry(symbol_conf.dso_list, self->name))) {
 488                 unsigned int slen = strlen(self->name);
 489                 if (slen > dsos__col_width)
 490                         dsos__col_width = slen;
 491         }
 492
 493         self->slen_calculated = 1;
 494 }
 495
 496 int event__preprocess_sample(const event_t *self, struct perf_session *session,
 497                              struct addr_location *al, symbol_filter_t filter)
 498 {
 499         u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 500         struct thread *thread = perf_session__findnew(session, self->ip.pid);
 501
 502         if (thread == NULL)
 503                 return -1;
 504
 505         if (symbol_conf.comm_list &&
 506             !strlist__has_entry(symbol_conf.comm_list, thread->comm))
 507                 goto out_filtered;
 508
 509         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
 510
 511         thread__find_addr_location(thread, session, cpumode, MAP__FUNCTION,
 512                                    self->ip.ip, al, filter);
 513         dump_printf(" ...... dso: %s\n",
 514                     al->map ? al->map->dso->long_name :
 515                         al->level == 'H' ? "[hypervisor]" : "<not found>");
 516         /*
 517          * We have to do this here as we may have a dso with no symbol hit that
 518          * has a name longer than the ones with symbols sampled.
 519          */
 520         if (al->map && !sort_dso.elide && !al->map->dso->slen_calculated)
 521                 dso__calc_col_width(al->map->dso);
 522
 523         if (symbol_conf.dso_list &&
 524             (!al->map || !al->map->dso ||
 525              !(strlist__has_entry(symbol_conf.dso_list, al->map->dso->short_name) ||
 526                (al->map->dso->short_name != al->map->dso->long_name &&
 527                 strlist__has_entry(symbol_conf.dso_list, al->map->dso->long_name)))))
 528                 goto out_filtered;
 529
 530         if (symbol_conf.sym_list && al->sym &&
 531             !strlist__has_entry(symbol_conf.sym_list, al->sym->name))
 532                 goto out_filtered;
 533
 534         al->filtered = false;
 535         return 0;
 536
 537 out_filtered:
 538         al->filtered = true;
 539         return 0;
 540 }
 541
 542 int event__parse_sample(event_t *event, u64 type, struct sample_data *data)
 543 {
 544         u64 *array = event->sample.array;
 545
 546         if (type & PERF_SAMPLE_IP) {
 547                 data->ip = event->ip.ip;
 548                 array++;
 549         }
 550
 551         if (type & PERF_SAMPLE_TID) {
 552                 u32 *p = (u32 *)array;
 553                 data->pid = p[0];
 554                 data->tid = p[1];
 555                 array++;
 556         }
 557
 558         if (type & PERF_SAMPLE_TIME) {
 559                 data->time = *array;
 560                 array++;
 561         }
 562
 563         if (type & PERF_SAMPLE_ADDR) {
 564                 data->addr = *array;
 565                 array++;
 566         }
 567
 568         if (type & PERF_SAMPLE_ID) {
 569                 data->id = *array;
 570                 array++;
 571         }
 572
 573         if (type & PERF_SAMPLE_STREAM_ID) {
 574                 data->stream_id = *array;
 575                 array++;
 576         }
 577
 578         if (type & PERF_SAMPLE_CPU) {
 579                 u32 *p = (u32 *)array;
 580                 data->cpu = *p;
 581                 array++;
 582         }
 583
 584         if (type & PERF_SAMPLE_PERIOD) {
 585                 data->period = *array;
 586                 array++;
 587         }
 588
 589         if (type & PERF_SAMPLE_READ) {
 590                 pr_debug("PERF_SAMPLE_READ is unsuported for now\n");
 591                 return -1;
 592         }
 593
 594         if (type & PERF_SAMPLE_CALLCHAIN) {
 595                 data->callchain = (struct ip_callchain *)array;
 596                 array += 1 + data->callchain->nr;
 597         }
 598
 599         if (type & PERF_SAMPLE_RAW) {
 600                 u32 *p = (u32 *)array;
 601                 data->raw_size = *p;
 602                 p++;
 603                 data->raw_data = p;
 604         }
 605
 606         return 0;
 607 }