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