tools/perf/tests/hists_link.c

   1 #include "perf.h"
   2 #include "tests.h"
   3 #include "debug.h"
   4 #include "symbol.h"
   5 #include "sort.h"
   6 #include "evsel.h"
   7 #include "evlist.h"
   8 #include "machine.h"
   9 #include "thread.h"
  10 #include "parse-events.h"
  11
  12 static struct {
  13         u32 pid;
  14         const char *comm;
  15 } fake_threads[] = {
  16         { 100, "perf" },
  17         { 200, "perf" },
  18         { 300, "bash" },
  19 };
  20
  21 static struct {
  22         u32 pid;
  23         u64 start;
  24         const char *filename;
  25 } fake_mmap_info[] = {
  26         { 100, 0x40000, "perf" },
  27         { 100, 0x50000, "libc" },
  28         { 100, 0xf0000, "[kernel]" },
  29         { 200, 0x40000, "perf" },
  30         { 200, 0x50000, "libc" },
  31         { 200, 0xf0000, "[kernel]" },
  32         { 300, 0x40000, "bash" },
  33         { 300, 0x50000, "libc" },
  34         { 300, 0xf0000, "[kernel]" },
  35 };
  36
  37 struct fake_sym {
  38         u64 start;
  39         u64 length;
  40         const char *name;
  41 };
  42
  43 static struct fake_sym perf_syms[] = {
  44         { 700, 100, "main" },
  45         { 800, 100, "run_command" },
  46         { 900, 100, "cmd_record" },
  47 };
  48
  49 static struct fake_sym bash_syms[] = {
  50         { 700, 100, "main" },
  51         { 800, 100, "xmalloc" },
  52         { 900, 100, "xfree" },
  53 };
  54
  55 static struct fake_sym libc_syms[] = {
  56         { 700, 100, "malloc" },
  57         { 800, 100, "free" },
  58         { 900, 100, "realloc" },
  59 };
  60
  61 static struct fake_sym kernel_syms[] = {
  62         { 700, 100, "schedule" },
  63         { 800, 100, "page_fault" },
  64         { 900, 100, "sys_perf_event_open" },
  65 };
  66
  67 static struct {
  68         const char *dso_name;
  69         struct fake_sym *syms;
  70         size_t nr_syms;
  71 } fake_symbols[] = {
  72         { "perf", perf_syms, ARRAY_SIZE(perf_syms) },
  73         { "bash", bash_syms, ARRAY_SIZE(bash_syms) },
  74         { "libc", libc_syms, ARRAY_SIZE(libc_syms) },
  75         { "[kernel]", kernel_syms, ARRAY_SIZE(kernel_syms) },
  76 };
  77
  78 static struct machine *setup_fake_machine(struct machines *machines)
  79 {
  80         struct machine *machine = machines__find(machines, HOST_KERNEL_ID);
  81         size_t i;
  82
  83         if (machine == NULL) {
  84                 pr_debug("Not enough memory for machine setup\n");
  85                 return NULL;
  86         }
  87
  88         for (i = 0; i < ARRAY_SIZE(fake_threads); i++) {
  89                 struct thread *thread;
  90
  91                 thread = machine__findnew_thread(machine, fake_threads[i].pid,
  92                                                  fake_threads[i].pid);
  93                 if (thread == NULL)
  94                         goto out;
  95
  96                 thread__set_comm(thread, fake_threads[i].comm, 0);
  97         }
  98
  99         for (i = 0; i < ARRAY_SIZE(fake_mmap_info); i++) {
 100                 union perf_event fake_mmap_event = {
 101                         .mmap = {
 102                                 .header = { .misc = PERF_RECORD_MISC_USER, },
 103                                 .pid = fake_mmap_info[i].pid,
 104                                 .tid = fake_mmap_info[i].pid,
 105                                 .start = fake_mmap_info[i].start,
 106                                 .len = 0x1000ULL,
 107                                 .pgoff = 0ULL,
 108                         },
 109                 };
 110
 111                 strcpy(fake_mmap_event.mmap.filename,
 112                        fake_mmap_info[i].filename);
 113
 114                 machine__process_mmap_event(machine, &fake_mmap_event, NULL);
 115         }
 116
 117         for (i = 0; i < ARRAY_SIZE(fake_symbols); i++) {
 118                 size_t k;
 119                 struct dso *dso;
 120
 121                 dso = __dsos__findnew(&machine->user_dsos,
 122                                       fake_symbols[i].dso_name);
 123                 if (dso == NULL)
 124                         goto out;
 125
 126                 /* emulate dso__load() */
 127                 dso__set_loaded(dso, MAP__FUNCTION);
 128
 129                 for (k = 0; k < fake_symbols[i].nr_syms; k++) {
 130                         struct symbol *sym;
 131                         struct fake_sym *fsym = &fake_symbols[i].syms[k];
 132
 133                         sym = symbol__new(fsym->start, fsym->length,
 134                                           STB_GLOBAL, fsym->name);
 135                         if (sym == NULL)
 136                                 goto out;
 137
 138                         symbols__insert(&dso->symbols[MAP__FUNCTION], sym);
 139                 }
 140         }
 141
 142         return machine;
 143
 144 out:
 145         pr_debug("Not enough memory for machine setup\n");
 146         machine__delete_threads(machine);
 147         machine__delete(machine);
 148         return NULL;
 149 }
 150
 151 struct sample {
 152         u32 pid;
 153         u64 ip;
 154         struct thread *thread;
 155         struct map *map;
 156         struct symbol *sym;
 157 };
 158
 159 static struct sample fake_common_samples[] = {
 160         /* perf [kernel] schedule() */
 161         { .pid = 100, .ip = 0xf0000 + 700, },
 162         /* perf [perf]   main() */
 163         { .pid = 200, .ip = 0x40000 + 700, },
 164         /* perf [perf]   cmd_record() */
 165         { .pid = 200, .ip = 0x40000 + 900, },
 166         /* bash [bash]   xmalloc() */
 167         { .pid = 300, .ip = 0x40000 + 800, },
 168         /* bash [libc]   malloc() */
 169         { .pid = 300, .ip = 0x50000 + 700, },
 170 };
 171
 172 static struct sample fake_samples[][5] = {
 173         {
 174                 /* perf [perf]   run_command() */
 175                 { .pid = 100, .ip = 0x40000 + 800, },
 176                 /* perf [libc]   malloc() */
 177                 { .pid = 100, .ip = 0x50000 + 700, },
 178                 /* perf [kernel] page_fault() */
 179                 { .pid = 100, .ip = 0xf0000 + 800, },
 180                 /* perf [kernel] sys_perf_event_open() */
 181                 { .pid = 200, .ip = 0xf0000 + 900, },
 182                 /* bash [libc]   free() */
 183                 { .pid = 300, .ip = 0x50000 + 800, },
 184         },
 185         {
 186                 /* perf [libc]   free() */
 187                 { .pid = 200, .ip = 0x50000 + 800, },
 188                 /* bash [libc]   malloc() */
 189                 { .pid = 300, .ip = 0x50000 + 700, }, /* will be merged */
 190                 /* bash [bash]   xfee() */
 191                 { .pid = 300, .ip = 0x40000 + 900, },
 192                 /* bash [libc]   realloc() */
 193                 { .pid = 300, .ip = 0x50000 + 900, },
 194                 /* bash [kernel] page_fault() */
 195                 { .pid = 300, .ip = 0xf0000 + 800, },
 196         },
 197 };
 198
 199 static int add_hist_entries(struct perf_evlist *evlist, struct machine *machine)
 200 {
 201         struct perf_evsel *evsel;
 202         struct addr_location al;
 203         struct hist_entry *he;
 204         struct perf_sample sample = { .cpu = 0, };
 205         size_t i = 0, k;
 206
 207         /*
 208          * each evsel will have 10 samples - 5 common and 5 distinct.
 209          * However the second evsel also has a collapsed entry for
 210          * "bash [libc] malloc" so total 9 entries will be in the tree.
 211          */
 212         evlist__for_each(evlist, evsel) {
 213                 for (k = 0; k < ARRAY_SIZE(fake_common_samples); k++) {
 214                         const union perf_event event = {
 215                                 .header = {
 216                                         .misc = PERF_RECORD_MISC_USER,
 217                                 },
 218                         };
 219
 220                         sample.pid = fake_common_samples[k].pid;
 221                         sample.ip = fake_common_samples[k].ip;
 222                         if (perf_event__preprocess_sample(&event, machine, &al,
 223                                                           &sample) < 0)
 224                                 goto out;
 225
 226                         he = __hists__add_entry(&evsel->hists, &al, NULL,
 227                                                 NULL, NULL, 1, 1, 0);
 228                         if (he == NULL)
 229                                 goto out;
 230
 231                         fake_common_samples[k].thread = al.thread;
 232                         fake_common_samples[k].map = al.map;
 233                         fake_common_samples[k].sym = al.sym;
 234                 }
 235
 236                 for (k = 0; k < ARRAY_SIZE(fake_samples[i]); k++) {
 237                         const union perf_event event = {
 238                                 .header = {
 239                                         .misc = PERF_RECORD_MISC_USER,
 240                                 },
 241                         };
 242
 243                         sample.pid = fake_samples[i][k].pid;
 244                         sample.ip = fake_samples[i][k].ip;
 245                         if (perf_event__preprocess_sample(&event, machine, &al,
 246                                                           &sample) < 0)
 247                                 goto out;
 248
 249                         he = __hists__add_entry(&evsel->hists, &al, NULL,
 250                                                 NULL, NULL, 1, 1, 0);
 251                         if (he == NULL)
 252                                 goto out;
 253
 254                         fake_samples[i][k].thread = al.thread;
 255                         fake_samples[i][k].map = al.map;
 256                         fake_samples[i][k].sym = al.sym;
 257                 }
 258                 i++;
 259         }
 260
 261         return 0;
 262
 263 out:
 264         pr_debug("Not enough memory for adding a hist entry\n");
 265         return -1;
 266 }
 267
 268 static int find_sample(struct sample *samples, size_t nr_samples,
 269                        struct thread *t, struct map *m, struct symbol *s)
 270 {
 271         while (nr_samples--) {
 272                 if (samples->thread == t && samples->map == m &&
 273                     samples->sym == s)
 274                         return 1;
 275                 samples++;
 276         }
 277         return 0;
 278 }
 279
 280 static int __validate_match(struct hists *hists)
 281 {
 282         size_t count = 0;
 283         struct rb_root *root;
 284         struct rb_node *node;
 285
 286         /*
 287          * Only entries from fake_common_samples should have a pair.
 288          */
 289         if (sort__need_collapse)
 290                 root = &hists->entries_collapsed;
 291         else
 292                 root = hists->entries_in;
 293
 294         node = rb_first(root);
 295         while (node) {
 296                 struct hist_entry *he;
 297
 298                 he = rb_entry(node, struct hist_entry, rb_node_in);
 299
 300                 if (hist_entry__has_pairs(he)) {
 301                         if (find_sample(fake_common_samples,
 302                                         ARRAY_SIZE(fake_common_samples),
 303                                         he->thread, he->ms.map, he->ms.sym)) {
 304                                 count++;
 305                         } else {
 306                                 pr_debug("Can't find the matched entry\n");
 307                                 return -1;
 308                         }
 309                 }
 310
 311                 node = rb_next(node);
 312         }
 313
 314         if (count != ARRAY_SIZE(fake_common_samples)) {
 315                 pr_debug("Invalid count for matched entries: %zd of %zd\n",
 316                          count, ARRAY_SIZE(fake_common_samples));
 317                 return -1;
 318         }
 319
 320         return 0;
 321 }
 322
 323 static int validate_match(struct hists *leader, struct hists *other)
 324 {
 325         return __validate_match(leader) || __validate_match(other);
 326 }
 327
 328 static int __validate_link(struct hists *hists, int idx)
 329 {
 330         size_t count = 0;
 331         size_t count_pair = 0;
 332         size_t count_dummy = 0;
 333         struct rb_root *root;
 334         struct rb_node *node;
 335
 336         /*
 337          * Leader hists (idx = 0) will have dummy entries from other,
 338          * and some entries will have no pair.  However every entry
 339          * in other hists should have (dummy) pair.
 340          */
 341         if (sort__need_collapse)
 342                 root = &hists->entries_collapsed;
 343         else
 344                 root = hists->entries_in;
 345
 346         node = rb_first(root);
 347         while (node) {
 348                 struct hist_entry *he;
 349
 350                 he = rb_entry(node, struct hist_entry, rb_node_in);
 351
 352                 if (hist_entry__has_pairs(he)) {
 353                         if (!find_sample(fake_common_samples,
 354                                          ARRAY_SIZE(fake_common_samples),
 355                                          he->thread, he->ms.map, he->ms.sym) &&
 356                             !find_sample(fake_samples[idx],
 357                                          ARRAY_SIZE(fake_samples[idx]),
 358                                          he->thread, he->ms.map, he->ms.sym)) {
 359                                 count_dummy++;
 360                         }
 361                         count_pair++;
 362                 } else if (idx) {
 363                         pr_debug("A entry from the other hists should have pair\n");
 364                         return -1;
 365                 }
 366
 367                 count++;
 368                 node = rb_next(node);
 369         }
 370
 371         /*
 372          * Note that we have a entry collapsed in the other (idx = 1) hists.
 373          */
 374         if (idx == 0) {
 375                 if (count_dummy != ARRAY_SIZE(fake_samples[1]) - 1) {
 376                         pr_debug("Invalid count of dummy entries: %zd of %zd\n",
 377                                  count_dummy, ARRAY_SIZE(fake_samples[1]) - 1);
 378                         return -1;
 379                 }
 380                 if (count != count_pair + ARRAY_SIZE(fake_samples[0])) {
 381                         pr_debug("Invalid count of total leader entries: %zd of %zd\n",
 382                                  count, count_pair + ARRAY_SIZE(fake_samples[0]));
 383                         return -1;
 384                 }
 385         } else {
 386                 if (count != count_pair) {
 387                         pr_debug("Invalid count of total other entries: %zd of %zd\n",
 388                                  count, count_pair);
 389                         return -1;
 390                 }
 391                 if (count_dummy > 0) {
 392                         pr_debug("Other hists should not have dummy entries: %zd\n",
 393                                  count_dummy);
 394                         return -1;
 395                 }
 396         }
 397
 398         return 0;
 399 }
 400
 401 static int validate_link(struct hists *leader, struct hists *other)
 402 {
 403         return __validate_link(leader, 0) || __validate_link(other, 1);
 404 }
 405
 406 static void print_hists(struct hists *hists)
 407 {
 408         int i = 0;
 409         struct rb_root *root;
 410         struct rb_node *node;
 411
 412         if (sort__need_collapse)
 413                 root = &hists->entries_collapsed;
 414         else
 415                 root = hists->entries_in;
 416
 417         pr_info("----- %s --------\n", __func__);
 418         node = rb_first(root);
 419         while (node) {
 420                 struct hist_entry *he;
 421
 422                 he = rb_entry(node, struct hist_entry, rb_node_in);
 423
 424                 pr_info("%2d: entry: %-8s [%-8s] %20s: period = %"PRIu64"\n",
 425                         i, thread__comm_str(he->thread), he->ms.map->dso->short_name,
 426                         he->ms.sym->name, he->stat.period);
 427
 428                 i++;
 429                 node = rb_next(node);
 430         }
 431 }
 432
 433 int test__hists_link(void)
 434 {
 435         int err = -1;
 436         struct machines machines;
 437         struct machine *machine = NULL;
 438         struct perf_evsel *evsel, *first;
 439         struct perf_evlist *evlist = perf_evlist__new();
 440
 441         if (evlist == NULL)
 442                 return -ENOMEM;
 443
 444         err = parse_events(evlist, "cpu-clock");
 445         if (err)
 446                 goto out;
 447         err = parse_events(evlist, "task-clock");
 448         if (err)
 449                 goto out;
 450
 451         /* default sort order (comm,dso,sym) will be used */
 452         if (setup_sorting() < 0)
 453                 goto out;
 454
 455         machines__init(&machines);
 456
 457         /* setup threads/dso/map/symbols also */
 458         machine = setup_fake_machine(&machines);
 459         if (!machine)
 460                 goto out;
 461
 462         if (verbose > 1)
 463                 machine__fprintf(machine, stderr);
 464
 465         /* process sample events */
 466         err = add_hist_entries(evlist, machine);
 467         if (err < 0)
 468                 goto out;
 469
 470         evlist__for_each(evlist, evsel) {
 471                 hists__collapse_resort(&evsel->hists, NULL);
 472
 473                 if (verbose > 2)
 474                         print_hists(&evsel->hists);
 475         }
 476
 477         first = perf_evlist__first(evlist);
 478         evsel = perf_evlist__last(evlist);
 479
 480         /* match common entries */
 481         hists__match(&first->hists, &evsel->hists);
 482         err = validate_match(&first->hists, &evsel->hists);
 483         if (err)
 484                 goto out;
 485
 486         /* link common and/or dummy entries */
 487         hists__link(&first->hists, &evsel->hists);
 488         err = validate_link(&first->hists, &evsel->hists);
 489         if (err)
 490                 goto out;
 491
 492         err = 0;
 493
 494 out:
 495         /* tear down everything */
 496         perf_evlist__delete(evlist);
 497         machines__exit(&machines);
 498
 499         return err;
 500 }