1 // SPDX-License-Identifier: GPL-2.0 2 #include <stdlib.h> 3 #include <stddef.h> 4 #include <ftw.h> 5 #include <fcntl.h> 6 #include <errno.h> 7 #include <unistd.h> 8 #include <pthread.h> 9 #include <sys/mman.h> 10 #include <sys/wait.h> 11 #include <linux/kernel.h> 12 #include <linux/time64.h> 13 #include <linux/list.h> 14 #include <linux/err.h> 15 #include <linux/zalloc.h> 16 #include <internal/lib.h> 17 #include <subcmd/parse-options.h> 18 19 #include "bench.h" 20 #include "util/data.h" 21 #include "util/stat.h" 22 #include "util/debug.h" 23 #include "util/symbol.h" 24 #include "util/session.h" 25 #include "util/build-id.h" 26 #include "util/sample.h" 27 #include "util/synthetic-events.h" 28 29 #define MMAP_DEV_MAJOR 8 30 #define DSO_MMAP_RATIO 4 31 32 static unsigned int iterations = 100; 33 static unsigned int nr_mmaps = 100; 34 static unsigned int nr_samples = 100; /* samples per mmap */ 35 36 static u64 bench_sample_type; 37 static u16 bench_id_hdr_size; 38 39 struct bench_data { 40 int pid; 41 int input_pipe[2]; 42 int output_pipe[2]; 43 pthread_t th; 44 }; 45 46 struct bench_dso { 47 struct list_head list; 48 char *name; 49 int ino; 50 }; 51 52 static int nr_dsos; 53 static struct bench_dso *dsos; 54 55 extern int cmd_inject(int argc, const char *argv[]); 56 57 static const struct option options[] = { 58 OPT_UINTEGER('i', "iterations", &iterations, 59 "Number of iterations used to compute average (default: 100)"), 60 OPT_UINTEGER('m', "nr-mmaps", &nr_mmaps, 61 "Number of mmap events for each iteration (default: 100)"), 62 OPT_UINTEGER('n', "nr-samples", &nr_samples, 63 "Number of sample events per mmap event (default: 100)"), 64 OPT_INCR('v', "verbose", &verbose, 65 "be more verbose (show iteration count, DSO name, etc)"), 66 OPT_END() 67 }; 68 69 static const char *const bench_usage[] = { 70 "perf bench internals inject-build-id <options>", 71 NULL 72 }; 73 74 /* 75 * Helper for collect_dso that adds the given file as a dso to dso_list 76 * if it contains a build-id. Stops after collecting 4 times more than 77 * we need (for MMAP2 events). 78 */ 79 static int add_dso(const char *fpath, const struct stat *sb __maybe_unused, 80 int typeflag, struct FTW *ftwbuf __maybe_unused) 81 { 82 struct bench_dso *dso = &dsos[nr_dsos]; 83 struct build_id bid; 84 85 if (typeflag == FTW_D || typeflag == FTW_SL) 86 return 0; 87 88 if (filename__read_build_id(fpath, &bid) < 0) 89 return 0; 90 91 dso->name = realpath(fpath, NULL); 92 if (dso->name == NULL) 93 return -1; 94 95 dso->ino = nr_dsos++; 96 pr_debug2(" Adding DSO: %s\n", fpath); 97 98 /* stop if we collected enough DSOs */ 99 if ((unsigned int)nr_dsos == DSO_MMAP_RATIO * nr_mmaps) 100 return 1; 101 102 return 0; 103 } 104 105 static void collect_dso(void) 106 { 107 dsos = calloc(nr_mmaps * DSO_MMAP_RATIO, sizeof(*dsos)); 108 if (dsos == NULL) { 109 printf(" Memory allocation failed\n"); 110 exit(1); 111 } 112 113 if (nftw("/usr/lib/", add_dso, 10, FTW_PHYS) < 0) 114 return; 115 116 pr_debug(" Collected %d DSOs\n", nr_dsos); 117 } 118 119 static void release_dso(void) 120 { 121 int i; 122 123 for (i = 0; i < nr_dsos; i++) { 124 struct bench_dso *dso = &dsos[i]; 125 126 zfree(&dso->name); 127 } 128 free(dsos); 129 } 130 131 /* Fake address used by mmap and sample events */ 132 static u64 dso_map_addr(struct bench_dso *dso) 133 { 134 return 0x400000ULL + dso->ino * 8192ULL; 135 } 136 137 static ssize_t synthesize_attr(struct bench_data *data) 138 { 139 union perf_event event; 140 141 memset(&event, 0, sizeof(event.attr) + sizeof(u64)); 142 143 event.header.type = PERF_RECORD_HEADER_ATTR; 144 event.header.size = sizeof(event.attr) + sizeof(u64); 145 146 event.attr.attr.type = PERF_TYPE_SOFTWARE; 147 event.attr.attr.config = PERF_COUNT_SW_TASK_CLOCK; 148 event.attr.attr.exclude_kernel = 1; 149 event.attr.attr.sample_id_all = 1; 150 event.attr.attr.sample_type = bench_sample_type; 151 152 return writen(data->input_pipe[1], &event, event.header.size); 153 } 154 155 static ssize_t synthesize_fork(struct bench_data *data) 156 { 157 union perf_event event; 158 159 memset(&event, 0, sizeof(event.fork) + bench_id_hdr_size); 160 161 event.header.type = PERF_RECORD_FORK; 162 event.header.misc = PERF_RECORD_MISC_FORK_EXEC; 163 event.header.size = sizeof(event.fork) + bench_id_hdr_size; 164 165 event.fork.ppid = 1; 166 event.fork.ptid = 1; 167 event.fork.pid = data->pid; 168 event.fork.tid = data->pid; 169 170 return writen(data->input_pipe[1], &event, event.header.size); 171 } 172 173 static ssize_t synthesize_mmap(struct bench_data *data, struct bench_dso *dso, u64 timestamp) 174 { 175 union perf_event event; 176 size_t len = offsetof(struct perf_record_mmap2, filename); 177 u64 *id_hdr_ptr = (void *)&event; 178 int ts_idx; 179 180 len += roundup(strlen(dso->name) + 1, 8) + bench_id_hdr_size; 181 182 memset(&event, 0, min(len, sizeof(event.mmap2))); 183 184 event.header.type = PERF_RECORD_MMAP2; 185 event.header.misc = PERF_RECORD_MISC_USER; 186 event.header.size = len; 187 188 event.mmap2.pid = data->pid; 189 event.mmap2.tid = data->pid; 190 event.mmap2.maj = MMAP_DEV_MAJOR; 191 event.mmap2.ino = dso->ino; 192 193 strcpy(event.mmap2.filename, dso->name); 194 195 event.mmap2.start = dso_map_addr(dso); 196 event.mmap2.len = 4096; 197 event.mmap2.prot = PROT_EXEC; 198 199 if (len > sizeof(event.mmap2)) { 200 /* write mmap2 event first */ 201 if (writen(data->input_pipe[1], &event, len - bench_id_hdr_size) < 0) 202 return -1; 203 /* zero-fill sample id header */ 204 memset(id_hdr_ptr, 0, bench_id_hdr_size); 205 /* put timestamp in the right position */ 206 ts_idx = (bench_id_hdr_size / sizeof(u64)) - 2; 207 id_hdr_ptr[ts_idx] = timestamp; 208 if (writen(data->input_pipe[1], id_hdr_ptr, bench_id_hdr_size) < 0) 209 return -1; 210 211 return len; 212 } 213 214 ts_idx = (len / sizeof(u64)) - 2; 215 id_hdr_ptr[ts_idx] = timestamp; 216 return writen(data->input_pipe[1], &event, len); 217 } 218 219 static ssize_t synthesize_sample(struct bench_data *data, struct bench_dso *dso, u64 timestamp) 220 { 221 union perf_event event; 222 struct perf_sample sample = { 223 .tid = data->pid, 224 .pid = data->pid, 225 .ip = dso_map_addr(dso), 226 .time = timestamp, 227 }; 228 229 event.header.type = PERF_RECORD_SAMPLE; 230 event.header.misc = PERF_RECORD_MISC_USER; 231 event.header.size = perf_event__sample_event_size(&sample, bench_sample_type, 0); 232 233 perf_event__synthesize_sample(&event, bench_sample_type, 0, &sample); 234 235 return writen(data->input_pipe[1], &event, event.header.size); 236 } 237 238 static ssize_t synthesize_flush(struct bench_data *data) 239 { 240 struct perf_event_header header = { 241 .size = sizeof(header), 242 .type = PERF_RECORD_FINISHED_ROUND, 243 }; 244 245 return writen(data->input_pipe[1], &header, header.size); 246 } 247 248 static void *data_reader(void *arg) 249 { 250 struct bench_data *data = arg; 251 char buf[8192]; 252 int flag; 253 int n; 254 255 flag = fcntl(data->output_pipe[0], F_GETFL); 256 fcntl(data->output_pipe[0], F_SETFL, flag | O_NONBLOCK); 257 258 /* read out data from child */ 259 while (true) { 260 n = read(data->output_pipe[0], buf, sizeof(buf)); 261 if (n > 0) 262 continue; 263 if (n == 0) 264 break; 265 266 if (errno != EINTR && errno != EAGAIN) 267 break; 268 269 usleep(100); 270 } 271 272 close(data->output_pipe[0]); 273 return NULL; 274 } 275 276 static int setup_injection(struct bench_data *data, bool build_id_all) 277 { 278 int ready_pipe[2]; 279 int dev_null_fd; 280 char buf; 281 282 if (pipe(ready_pipe) < 0) 283 return -1; 284 285 if (pipe(data->input_pipe) < 0) 286 return -1; 287 288 if (pipe(data->output_pipe) < 0) 289 return -1; 290 291 data->pid = fork(); 292 if (data->pid < 0) 293 return -1; 294 295 if (data->pid == 0) { 296 const char **inject_argv; 297 int inject_argc = 2; 298 299 close(data->input_pipe[1]); 300 close(data->output_pipe[0]); 301 close(ready_pipe[0]); 302 303 dup2(data->input_pipe[0], STDIN_FILENO); 304 close(data->input_pipe[0]); 305 dup2(data->output_pipe[1], STDOUT_FILENO); 306 close(data->output_pipe[1]); 307 308 dev_null_fd = open("/dev/null", O_WRONLY); 309 if (dev_null_fd < 0) 310 exit(1); 311 312 dup2(dev_null_fd, STDERR_FILENO); 313 314 if (build_id_all) 315 inject_argc++; 316 317 inject_argv = calloc(inject_argc + 1, sizeof(*inject_argv)); 318 if (inject_argv == NULL) 319 exit(1); 320 321 inject_argv[0] = strdup("inject"); 322 inject_argv[1] = strdup("-b"); 323 if (build_id_all) 324 inject_argv[2] = strdup("--buildid-all"); 325 326 /* signal that we're ready to go */ 327 close(ready_pipe[1]); 328 329 cmd_inject(inject_argc, inject_argv); 330 331 exit(0); 332 } 333 334 pthread_create(&data->th, NULL, data_reader, data); 335 336 close(ready_pipe[1]); 337 close(data->input_pipe[0]); 338 close(data->output_pipe[1]); 339 340 /* wait for child ready */ 341 if (read(ready_pipe[0], &buf, 1) < 0) 342 return -1; 343 close(ready_pipe[0]); 344 345 return 0; 346 } 347 348 static int inject_build_id(struct bench_data *data, u64 *max_rss) 349 { 350 int status; 351 unsigned int i, k; 352 struct rusage rusage; 353 354 /* this makes the child to run */ 355 if (perf_header__write_pipe(data->input_pipe[1]) < 0) 356 return -1; 357 358 if (synthesize_attr(data) < 0) 359 return -1; 360 361 if (synthesize_fork(data) < 0) 362 return -1; 363 364 for (i = 0; i < nr_mmaps; i++) { 365 int idx = rand() % nr_dsos; 366 struct bench_dso *dso = &dsos[idx]; 367 u64 timestamp = rand() % 1000000; 368 369 pr_debug2(" [%d] injecting: %s\n", i+1, dso->name); 370 if (synthesize_mmap(data, dso, timestamp) < 0) 371 return -1; 372 373 for (k = 0; k < nr_samples; k++) { 374 if (synthesize_sample(data, dso, timestamp + k * 1000) < 0) 375 return -1; 376 } 377 378 if ((i + 1) % 10 == 0) { 379 if (synthesize_flush(data) < 0) 380 return -1; 381 } 382 } 383 384 /* this makes the child to finish */ 385 close(data->input_pipe[1]); 386 387 wait4(data->pid, &status, 0, &rusage); 388 *max_rss = rusage.ru_maxrss; 389 390 pr_debug(" Child %d exited with %d\n", data->pid, status); 391 392 return 0; 393 } 394 395 static void do_inject_loop(struct bench_data *data, bool build_id_all) 396 { 397 unsigned int i; 398 struct stats time_stats, mem_stats; 399 double time_average, time_stddev; 400 double mem_average, mem_stddev; 401 402 init_stats(&time_stats); 403 init_stats(&mem_stats); 404 405 pr_debug(" Build-id%s injection benchmark\n", build_id_all ? "-all" : ""); 406 407 for (i = 0; i < iterations; i++) { 408 struct timeval start, end, diff; 409 u64 runtime_us, max_rss; 410 411 pr_debug(" Iteration #%d\n", i+1); 412 413 if (setup_injection(data, build_id_all) < 0) { 414 printf(" Build-id injection setup failed\n"); 415 break; 416 } 417 418 gettimeofday(&start, NULL); 419 if (inject_build_id(data, &max_rss) < 0) { 420 printf(" Build-id injection failed\n"); 421 break; 422 } 423 424 gettimeofday(&end, NULL); 425 timersub(&end, &start, &diff); 426 runtime_us = diff.tv_sec * USEC_PER_SEC + diff.tv_usec; 427 update_stats(&time_stats, runtime_us); 428 update_stats(&mem_stats, max_rss); 429 430 pthread_join(data->th, NULL); 431 } 432 433 time_average = avg_stats(&time_stats) / USEC_PER_MSEC; 434 time_stddev = stddev_stats(&time_stats) / USEC_PER_MSEC; 435 printf(" Average build-id%s injection took: %.3f msec (+- %.3f msec)\n", 436 build_id_all ? "-all" : "", time_average, time_stddev); 437 438 /* each iteration, it processes MMAP2 + BUILD_ID + nr_samples * SAMPLE */ 439 time_average = avg_stats(&time_stats) / (nr_mmaps * (nr_samples + 2)); 440 time_stddev = stddev_stats(&time_stats) / (nr_mmaps * (nr_samples + 2)); 441 printf(" Average time per event: %.3f usec (+- %.3f usec)\n", 442 time_average, time_stddev); 443 444 mem_average = avg_stats(&mem_stats); 445 mem_stddev = stddev_stats(&mem_stats); 446 printf(" Average memory usage: %.0f KB (+- %.0f KB)\n", 447 mem_average, mem_stddev); 448 } 449 450 static int do_inject_loops(struct bench_data *data) 451 { 452 453 srand(time(NULL)); 454 symbol__init(NULL); 455 456 bench_sample_type = PERF_SAMPLE_IDENTIFIER | PERF_SAMPLE_IP; 457 bench_sample_type |= PERF_SAMPLE_TID | PERF_SAMPLE_TIME; 458 bench_id_hdr_size = 32; 459 460 collect_dso(); 461 if (nr_dsos == 0) { 462 printf(" Cannot collect DSOs for injection\n"); 463 return -1; 464 } 465 466 do_inject_loop(data, false); 467 do_inject_loop(data, true); 468 469 release_dso(); 470 return 0; 471 } 472 473 int bench_inject_build_id(int argc, const char **argv) 474 { 475 struct bench_data data; 476 477 argc = parse_options(argc, argv, options, bench_usage, 0); 478 if (argc) { 479 usage_with_options(bench_usage, options); 480 exit(EXIT_FAILURE); 481 } 482 483 return do_inject_loops(&data); 484 } 485 486