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 char bf; 212 int count = 0; 213 214 snprintf(path, PATH_MAX, "%s/kernel/debug/tracing/events/syscalls/sys_enter_prctl/id", 215 sysfs__mountpoint()); 216 217 if (filename__read_int(path, &id)) { 218 fprintf(stderr, "error: failed to get tracepoint id: %s\n", path); 219 return -1; 220 } 221 222 attr.config = id; 223 224 err = pipe(go_pipe); 225 __T("failed to create pipe", err == 0); 226 227 fflush(NULL); 228 229 pid = fork(); 230 if (!pid) { 231 int i; 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], &bf, 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 } 414