tools/lib/perf/tests/test-evlist.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #define _GNU_SOURCE // needed for sched.h to get sched_[gs]etaffinity and CPU_(ZERO,SET)
   3 #include <sched.h>
   4 #include <stdio.h>
   5 #include <stdarg.h>
   6 #include <unistd.h>
   7 #include <stdlib.h>
   8 #include <linux/perf_event.h>
   9 #include <linux/limits.h>
  10 #include <sys/types.h>
  11 #include <sys/wait.h>
  12 #include <sys/prctl.h>
  13 #include <perf/cpumap.h>
  14 #include <perf/threadmap.h>
  15 #include <perf/evlist.h>
  16 #include <perf/evsel.h>
  17 #include <perf/mmap.h>
  18 #include <perf/event.h>
  19 #include <internal/tests.h>
  20 #include <api/fs/fs.h>
  21
  22 static int libperf_print(enum libperf_print_level level,
  23                          const char *fmt, va_list ap)
  24 {
  25         return vfprintf(stderr, fmt, ap);
  26 }
  27
  28 static int test_stat_cpu(void)
  29 {
  30         struct perf_cpu_map *cpus;
  31         struct perf_evlist *evlist;
  32         struct perf_evsel *evsel;
  33         struct perf_event_attr attr1 = {
  34                 .type   = PERF_TYPE_SOFTWARE,
  35                 .config = PERF_COUNT_SW_CPU_CLOCK,
  36         };
  37         struct perf_event_attr attr2 = {
  38                 .type   = PERF_TYPE_SOFTWARE,
  39                 .config = PERF_COUNT_SW_TASK_CLOCK,
  40         };
  41         int err, cpu, tmp;
  42
  43         cpus = perf_cpu_map__new(NULL);
  44         __T("failed to create cpus", cpus);
  45
  46         evlist = perf_evlist__new();
  47         __T("failed to create evlist", evlist);
  48
  49         evsel = perf_evsel__new(&attr1);
  50         __T("failed to create evsel1", evsel);
  51
  52         perf_evlist__add(evlist, evsel);
  53
  54         evsel = perf_evsel__new(&attr2);
  55         __T("failed to create evsel2", evsel);
  56
  57         perf_evlist__add(evlist, evsel);
  58
  59         perf_evlist__set_maps(evlist, cpus, NULL);
  60
  61         err = perf_evlist__open(evlist);
  62         __T("failed to open evsel", err == 0);
  63
  64         perf_evlist__for_each_evsel(evlist, evsel) {
  65                 cpus = perf_evsel__cpus(evsel);
  66
  67                 perf_cpu_map__for_each_cpu(cpu, tmp, cpus) {
  68                         struct perf_counts_values counts = { .val = 0 };
  69
  70                         perf_evsel__read(evsel, cpu, 0, &counts);
  71                         __T("failed to read value for evsel", counts.val != 0);
  72                 }
  73         }
  74
  75         perf_evlist__close(evlist);
  76         perf_evlist__delete(evlist);
  77
  78         perf_cpu_map__put(cpus);
  79         return 0;
  80 }
  81
  82 static int test_stat_thread(void)
  83 {
  84         struct perf_counts_values counts = { .val = 0 };
  85         struct perf_thread_map *threads;
  86         struct perf_evlist *evlist;
  87         struct perf_evsel *evsel;
  88         struct perf_event_attr attr1 = {
  89                 .type   = PERF_TYPE_SOFTWARE,
  90                 .config = PERF_COUNT_SW_CPU_CLOCK,
  91         };
  92         struct perf_event_attr attr2 = {
  93                 .type   = PERF_TYPE_SOFTWARE,
  94                 .config = PERF_COUNT_SW_TASK_CLOCK,
  95         };
  96         int err;
  97
  98         threads = perf_thread_map__new_dummy();
  99         __T("failed to create threads", threads);
 100
 101         perf_thread_map__set_pid(threads, 0, 0);
 102
 103         evlist = perf_evlist__new();
 104         __T("failed to create evlist", evlist);
 105
 106         evsel = perf_evsel__new(&attr1);
 107         __T("failed to create evsel1", evsel);
 108
 109         perf_evlist__add(evlist, evsel);
 110
 111         evsel = perf_evsel__new(&attr2);
 112         __T("failed to create evsel2", evsel);
 113
 114         perf_evlist__add(evlist, evsel);
 115
 116         perf_evlist__set_maps(evlist, NULL, threads);
 117
 118         err = perf_evlist__open(evlist);
 119         __T("failed to open evsel", err == 0);
 120
 121         perf_evlist__for_each_evsel(evlist, evsel) {
 122                 perf_evsel__read(evsel, 0, 0, &counts);
 123                 __T("failed to read value for evsel", counts.val != 0);
 124         }
 125
 126         perf_evlist__close(evlist);
 127         perf_evlist__delete(evlist);
 128
 129         perf_thread_map__put(threads);
 130         return 0;
 131 }
 132
 133 static int test_stat_thread_enable(void)
 134 {
 135         struct perf_counts_values counts = { .val = 0 };
 136         struct perf_thread_map *threads;
 137         struct perf_evlist *evlist;
 138         struct perf_evsel *evsel;
 139         struct perf_event_attr attr1 = {
 140                 .type     = PERF_TYPE_SOFTWARE,
 141                 .config   = PERF_COUNT_SW_CPU_CLOCK,
 142                 .disabled = 1,
 143         };
 144         struct perf_event_attr attr2 = {
 145                 .type     = PERF_TYPE_SOFTWARE,
 146                 .config   = PERF_COUNT_SW_TASK_CLOCK,
 147                 .disabled = 1,
 148         };
 149         int err;
 150
 151         threads = perf_thread_map__new_dummy();
 152         __T("failed to create threads", threads);
 153
 154         perf_thread_map__set_pid(threads, 0, 0);
 155
 156         evlist = perf_evlist__new();
 157         __T("failed to create evlist", evlist);
 158
 159         evsel = perf_evsel__new(&attr1);
 160         __T("failed to create evsel1", evsel);
 161
 162         perf_evlist__add(evlist, evsel);
 163
 164         evsel = perf_evsel__new(&attr2);
 165         __T("failed to create evsel2", evsel);
 166
 167         perf_evlist__add(evlist, evsel);
 168
 169         perf_evlist__set_maps(evlist, NULL, threads);
 170
 171         err = perf_evlist__open(evlist);
 172         __T("failed to open evsel", err == 0);
 173
 174         perf_evlist__for_each_evsel(evlist, evsel) {
 175                 perf_evsel__read(evsel, 0, 0, &counts);
 176                 __T("failed to read value for evsel", counts.val == 0);
 177         }
 178
 179         perf_evlist__enable(evlist);
 180
 181         perf_evlist__for_each_evsel(evlist, evsel) {
 182                 perf_evsel__read(evsel, 0, 0, &counts);
 183                 __T("failed to read value for evsel", counts.val != 0);
 184         }
 185
 186         perf_evlist__disable(evlist);
 187
 188         perf_evlist__close(evlist);
 189         perf_evlist__delete(evlist);
 190
 191         perf_thread_map__put(threads);
 192         return 0;
 193 }
 194
 195 static int test_mmap_thread(void)
 196 {
 197         struct perf_evlist *evlist;
 198         struct perf_evsel *evsel;
 199         struct perf_mmap *map;
 200         struct perf_cpu_map *cpus;
 201         struct perf_thread_map *threads;
 202         struct perf_event_attr attr = {
 203                 .type             = PERF_TYPE_TRACEPOINT,
 204                 .sample_period    = 1,
 205                 .wakeup_watermark = 1,
 206                 .disabled         = 1,
 207         };
 208         char path[PATH_MAX];
 209         int id, err, pid, go_pipe[2];
 210         union perf_event *event;
 211         int count = 0;
 212
 213         snprintf(path, PATH_MAX, "%s/kernel/debug/tracing/events/syscalls/sys_enter_prctl/id",
 214                  sysfs__mountpoint());
 215
 216         if (filename__read_int(path, &id)) {
 217                 fprintf(stderr, "error: failed to get tracepoint id: %s\n", path);
 218                 return -1;
 219         }
 220
 221         attr.config = id;
 222
 223         err = pipe(go_pipe);
 224         __T("failed to create pipe", err == 0);
 225
 226         fflush(NULL);
 227
 228         pid = fork();
 229         if (!pid) {
 230                 int i;
 231                 char bf;
 232
 233                 read(go_pipe[0], &bf, 1);
 234
 235                 /* Generate 100 prctl calls. */
 236                 for (i = 0; i < 100; i++)
 237                         prctl(0, 0, 0, 0, 0);
 238
 239                 exit(0);
 240         }
 241
 242         threads = perf_thread_map__new_dummy();
 243         __T("failed to create threads", threads);
 244
 245         cpus = perf_cpu_map__dummy_new();
 246         __T("failed to create cpus", cpus);
 247
 248         perf_thread_map__set_pid(threads, 0, pid);
 249
 250         evlist = perf_evlist__new();
 251         __T("failed to create evlist", evlist);
 252
 253         evsel = perf_evsel__new(&attr);
 254         __T("failed to create evsel1", evsel);
 255
 256         perf_evlist__add(evlist, evsel);
 257
 258         perf_evlist__set_maps(evlist, cpus, threads);
 259
 260         err = perf_evlist__open(evlist);
 261         __T("failed to open evlist", err == 0);
 262
 263         err = perf_evlist__mmap(evlist, 4);
 264         __T("failed to mmap evlist", err == 0);
 265
 266         perf_evlist__enable(evlist);
 267
 268         /* kick the child and wait for it to finish */
 269         write(go_pipe[1], "A", 1);
 270         waitpid(pid, NULL, 0);
 271
 272         /*
 273          * There's no need to call perf_evlist__disable,
 274          * monitored process is dead now.
 275          */
 276
 277         perf_evlist__for_each_mmap(evlist, map, false) {
 278                 if (perf_mmap__read_init(map) < 0)
 279                         continue;
 280
 281                 while ((event = perf_mmap__read_event(map)) != NULL) {
 282                         count++;
 283                         perf_mmap__consume(map);
 284                 }
 285
 286                 perf_mmap__read_done(map);
 287         }
 288
 289         /* calls perf_evlist__munmap/perf_evlist__close */
 290         perf_evlist__delete(evlist);
 291
 292         perf_thread_map__put(threads);
 293         perf_cpu_map__put(cpus);
 294
 295         /*
 296          * The generated prctl calls should match the
 297          * number of events in the buffer.
 298          */
 299         __T("failed count", count == 100);
 300
 301         return 0;
 302 }
 303
 304 static int test_mmap_cpus(void)
 305 {
 306         struct perf_evlist *evlist;
 307         struct perf_evsel *evsel;
 308         struct perf_mmap *map;
 309         struct perf_cpu_map *cpus;
 310         struct perf_event_attr attr = {
 311                 .type             = PERF_TYPE_TRACEPOINT,
 312                 .sample_period    = 1,
 313                 .wakeup_watermark = 1,
 314                 .disabled         = 1,
 315         };
 316         cpu_set_t saved_mask;
 317         char path[PATH_MAX];
 318         int id, err, cpu, tmp;
 319         union perf_event *event;
 320         int count = 0;
 321
 322         snprintf(path, PATH_MAX, "%s/kernel/debug/tracing/events/syscalls/sys_enter_prctl/id",
 323                  sysfs__mountpoint());
 324
 325         if (filename__read_int(path, &id)) {
 326                 fprintf(stderr, "error: failed to get tracepoint id: %s\n", path);
 327                 return -1;
 328         }
 329
 330         attr.config = id;
 331
 332         cpus = perf_cpu_map__new(NULL);
 333         __T("failed to create cpus", cpus);
 334
 335         evlist = perf_evlist__new();
 336         __T("failed to create evlist", evlist);
 337
 338         evsel = perf_evsel__new(&attr);
 339         __T("failed to create evsel1", evsel);
 340
 341         perf_evlist__add(evlist, evsel);
 342
 343         perf_evlist__set_maps(evlist, cpus, NULL);
 344
 345         err = perf_evlist__open(evlist);
 346         __T("failed to open evlist", err == 0);
 347
 348         err = perf_evlist__mmap(evlist, 4);
 349         __T("failed to mmap evlist", err == 0);
 350
 351         perf_evlist__enable(evlist);
 352
 353         err = sched_getaffinity(0, sizeof(saved_mask), &saved_mask);
 354         __T("sched_getaffinity failed", err == 0);
 355
 356         perf_cpu_map__for_each_cpu(cpu, tmp, cpus) {
 357                 cpu_set_t mask;
 358
 359                 CPU_ZERO(&mask);
 360                 CPU_SET(cpu, &mask);
 361
 362                 err = sched_setaffinity(0, sizeof(mask), &mask);
 363                 __T("sched_setaffinity failed", err == 0);
 364
 365                 prctl(0, 0, 0, 0, 0);
 366         }
 367
 368         err = sched_setaffinity(0, sizeof(saved_mask), &saved_mask);
 369         __T("sched_setaffinity failed", err == 0);
 370
 371         perf_evlist__disable(evlist);
 372
 373         perf_evlist__for_each_mmap(evlist, map, false) {
 374                 if (perf_mmap__read_init(map) < 0)
 375                         continue;
 376
 377                 while ((event = perf_mmap__read_event(map)) != NULL) {
 378                         count++;
 379                         perf_mmap__consume(map);
 380                 }
 381
 382                 perf_mmap__read_done(map);
 383         }
 384
 385         /* calls perf_evlist__munmap/perf_evlist__close */
 386         perf_evlist__delete(evlist);
 387
 388         /*
 389          * The generated prctl events should match the
 390          * number of cpus or be bigger (we are system-wide).
 391          */
 392         __T("failed count", count >= perf_cpu_map__nr(cpus));
 393
 394         perf_cpu_map__put(cpus);
 395
 396         return 0;
 397 }
 398
 399 int main(int argc, char **argv)
 400 {
 401         __T_START;
 402
 403         libperf_init(libperf_print);
 404
 405         test_stat_cpu();
 406         test_stat_thread();
 407         test_stat_thread_enable();
 408         test_mmap_thread();
 409         test_mmap_cpus();
 410
 411         __T_END;
 412         return 0;
 413 }