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 <internal/lib.h> 16 #include <subcmd/parse-options.h> 17 18 #include "bench.h" 19 #include "util/data.h" 20 #include "util/stat.h" 21 #include "util/debug.h" 22 #include "util/event.h" 23 #include "util/symbol.h" 24 #include "util/session.h" 25 #include "util/build-id.h" 26 #include "util/synthetic-events.h" 27 28 #define MMAP_DEV_MAJOR 8 29 #define DSO_MMAP_RATIO 4 30 31 static unsigned int iterations = 100; 32 static unsigned int nr_mmaps = 100; 33 static unsigned int nr_samples = 100; /* samples per mmap */ 34 35 static u64 bench_sample_type; 36 static u16 bench_id_hdr_size; 37 38 struct bench_data { 39 int pid; 40 int input_pipe[2]; 41 int output_pipe[2]; 42 pthread_t th; 43 }; 44 45 struct bench_dso { 46 struct list_head list; 47 char *name; 48 int ino; 49 }; 50 51 static int nr_dsos; 52 static struct bench_dso *dsos; 53 54 extern int cmd_inject(int argc, const char *argv[]); 55 56 static const struct option options[] = { 57 OPT_UINTEGER('i', "iterations", &iterations, 58 "Number of iterations used to compute average (default: 100)"), 59 OPT_UINTEGER('m', "nr-mmaps", &nr_mmaps, 60 "Number of mmap events for each iteration (default: 100)"), 61 OPT_UINTEGER('n', "nr-samples", &nr_samples, 62 "Number of sample events per mmap event (default: 100)"), 63 OPT_INCR('v', "verbose", &verbose, 64 "be more verbose (show iteration count, DSO name, etc)"), 65 OPT_END() 66 }; 67 68 static const char *const bench_usage[] = { 69 "perf bench internals inject-build-id <options>", 70 NULL 71 }; 72 73 /* 74 * Helper for collect_dso that adds the given file as a dso to dso_list 75 * if it contains a build-id. Stops after collecting 4 times more than 76 * we need (for MMAP2 events). 77 */ 78 static int add_dso(const char *fpath, const struct stat *sb __maybe_unused, 79 int typeflag, struct FTW *ftwbuf __maybe_unused) 80 { 81 struct bench_dso *dso = &dsos[nr_dsos]; 82 struct build_id bid; 83 84 if (typeflag == FTW_D || typeflag == FTW_SL) 85 return 0; 86 87 if (filename__read_build_id(fpath, &bid) < 0) 88 return 0; 89 90 dso->name = realpath(fpath, NULL); 91 if (dso->name == NULL) 92 return -1; 93 94 dso->ino = nr_dsos++; 95 pr_debug2(" Adding DSO: %s\n", fpath); 96 97 /* stop if we collected enough DSOs */ 98 if ((unsigned int)nr_dsos == DSO_MMAP_RATIO * nr_mmaps) 99 return 1; 100 101 return 0; 102 } 103 104 static void collect_dso(void) 105 { 106 dsos = calloc(nr_mmaps * DSO_MMAP_RATIO, sizeof(*dsos)); 107 if (dsos == NULL) { 108 printf(" Memory allocation failed\n"); 109 exit(1); 110 } 111 112 if (nftw("/usr/lib/", add_dso, 10, FTW_PHYS) < 0) 113 return; 114 115 pr_debug(" Collected %d DSOs\n", nr_dsos); 116 } 117 118 static void release_dso(void) 119 { 120 int i; 121 122 for (i = 0; i < nr_dsos; i++) { 123 struct bench_dso *dso = &dsos[i]; 124 125 free(dso->name); 126 } 127 free(dsos); 128 } 129 130 /* Fake address used by mmap and sample events */ 131 static u64 dso_map_addr(struct bench_dso *dso) 132 { 133 return 0x400000ULL + dso->ino * 8192ULL; 134 } 135 136 static u32 synthesize_attr(struct bench_data *data) 137 { 138 union perf_event event; 139 140 memset(&event, 0, sizeof(event.attr) + sizeof(u64)); 141 142 event.header.type = PERF_RECORD_HEADER_ATTR; 143 event.header.size = sizeof(event.attr) + sizeof(u64); 144 145 event.attr.attr.type = PERF_TYPE_SOFTWARE; 146 event.attr.attr.config = PERF_COUNT_SW_TASK_CLOCK; 147 event.attr.attr.exclude_kernel = 1; 148 event.attr.attr.sample_id_all = 1; 149 event.attr.attr.sample_type = bench_sample_type; 150 151 return writen(data->input_pipe[1], &event, event.header.size); 152 } 153 154 static u32 synthesize_fork(struct bench_data *data) 155 { 156 union perf_event event; 157 158 memset(&event, 0, sizeof(event.fork) + bench_id_hdr_size); 159 160 event.header.type = PERF_RECORD_FORK; 161 event.header.misc = PERF_RECORD_MISC_FORK_EXEC; 162 event.header.size = sizeof(event.fork) + bench_id_hdr_size; 163 164 event.fork.ppid = 1; 165 event.fork.ptid = 1; 166 event.fork.pid = data->pid; 167 event.fork.tid = data->pid; 168 169 return writen(data->input_pipe[1], &event, event.header.size); 170 } 171 172 static u32 synthesize_mmap(struct bench_data *data, struct bench_dso *dso, 173 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 writen(data->input_pipe[1], &event, len - bench_id_hdr_size); 202 /* zero-fill sample id header */ 203 memset(id_hdr_ptr, 0, bench_id_hdr_size); 204 /* put timestamp in the right position */ 205 ts_idx = (bench_id_hdr_size / sizeof(u64)) - 2; 206 id_hdr_ptr[ts_idx] = timestamp; 207 writen(data->input_pipe[1], id_hdr_ptr, bench_id_hdr_size); 208 } else { 209 ts_idx = (len / sizeof(u64)) - 2; 210 id_hdr_ptr[ts_idx] = timestamp; 211 writen(data->input_pipe[1], &event, len); 212 } 213 return len; 214 } 215 216 static u32 synthesize_sample(struct bench_data *data, struct bench_dso *dso, 217 u64 timestamp) 218 { 219 union perf_event event; 220 struct perf_sample sample = { 221 .tid = data->pid, 222 .pid = data->pid, 223 .ip = dso_map_addr(dso), 224 .time = timestamp, 225 }; 226 227 event.header.type = PERF_RECORD_SAMPLE; 228 event.header.misc = PERF_RECORD_MISC_USER; 229 event.header.size = perf_event__sample_event_size(&sample, bench_sample_type, 0); 230 231 perf_event__synthesize_sample(&event, bench_sample_type, 0, &sample); 232 233 return writen(data->input_pipe[1], &event, event.header.size); 234 } 235 236 static u32 synthesize_flush(struct bench_data *data) 237 { 238 struct perf_event_header header = { 239 .size = sizeof(header), 240 .type = PERF_RECORD_FINISHED_ROUND, 241 }; 242 243 return writen(data->input_pipe[1], &header, header.size); 244 } 245 246 static void *data_reader(void *arg) 247 { 248 struct bench_data *data = arg; 249 char buf[8192]; 250 int flag; 251 int n; 252 253 flag = fcntl(data->output_pipe[0], F_GETFL); 254 fcntl(data->output_pipe[0], F_SETFL, flag | O_NONBLOCK); 255 256 /* read out data from child */ 257 while (true) { 258 n = read(data->output_pipe[0], buf, sizeof(buf)); 259 if (n > 0) 260 continue; 261 if (n == 0) 262 break; 263 264 if (errno != EINTR && errno != EAGAIN) 265 break; 266 267 usleep(100); 268 } 269 270 close(data->output_pipe[0]); 271 return NULL; 272 } 273 274 static int setup_injection(struct bench_data *data, bool build_id_all) 275 { 276 int ready_pipe[2]; 277 int dev_null_fd; 278 char buf; 279 280 if (pipe(ready_pipe) < 0) 281 return -1; 282 283 if (pipe(data->input_pipe) < 0) 284 return -1; 285 286 if (pipe(data->output_pipe) < 0) 287 return -1; 288 289 data->pid = fork(); 290 if (data->pid < 0) 291 return -1; 292 293 if (data->pid == 0) { 294 const char **inject_argv; 295 int inject_argc = 2; 296 297 close(data->input_pipe[1]); 298 close(data->output_pipe[0]); 299 close(ready_pipe[0]); 300 301 dup2(data->input_pipe[0], STDIN_FILENO); 302 close(data->input_pipe[0]); 303 dup2(data->output_pipe[1], STDOUT_FILENO); 304 close(data->output_pipe[1]); 305 306 dev_null_fd = open("/dev/null", O_WRONLY); 307 if (dev_null_fd < 0) 308 exit(1); 309 310 dup2(dev_null_fd, STDERR_FILENO); 311 312 if (build_id_all) 313 inject_argc++; 314 315 inject_argv = calloc(inject_argc + 1, sizeof(*inject_argv)); 316 if (inject_argv == NULL) 317 exit(1); 318 319 inject_argv[0] = strdup("inject"); 320 inject_argv[1] = strdup("-b"); 321 if (build_id_all) 322 inject_argv[2] = strdup("--buildid-all"); 323 324 /* signal that we're ready to go */ 325 close(ready_pipe[1]); 326 327 cmd_inject(inject_argc, inject_argv); 328 329 exit(0); 330 } 331 332 pthread_create(&data->th, NULL, data_reader, data); 333 334 close(ready_pipe[1]); 335 close(data->input_pipe[0]); 336 close(data->output_pipe[1]); 337 338 /* wait for child ready */ 339 if (read(ready_pipe[0], &buf, 1) < 0) 340 return -1; 341 close(ready_pipe[0]); 342 343 return 0; 344 } 345 346 static int inject_build_id(struct bench_data *data, u64 *max_rss) 347 { 348 int status; 349 unsigned int i, k; 350 struct rusage rusage; 351 u64 len = 0; 352 353 /* this makes the child to run */ 354 if (perf_header__write_pipe(data->input_pipe[1]) < 0) 355 return -1; 356 357 len += synthesize_attr(data); 358 len += synthesize_fork(data); 359 360 for (i = 0; i < nr_mmaps; i++) { 361 int idx = rand() % (nr_dsos - 1); 362 struct bench_dso *dso = &dsos[idx]; 363 u64 timestamp = rand() % 1000000; 364 365 pr_debug2(" [%d] injecting: %s\n", i+1, dso->name); 366 len += synthesize_mmap(data, dso, timestamp); 367 368 for (k = 0; k < nr_samples; k++) 369 len += synthesize_sample(data, dso, timestamp + k * 1000); 370 371 if ((i + 1) % 10 == 0) 372 len += synthesize_flush(data); 373 } 374 375 /* tihs makes the child to finish */ 376 close(data->input_pipe[1]); 377 378 wait4(data->pid, &status, 0, &rusage); 379 *max_rss = rusage.ru_maxrss; 380 381 pr_debug(" Child %d exited with %d\n", data->pid, status); 382 383 return 0; 384 } 385 386 static void do_inject_loop(struct bench_data *data, bool build_id_all) 387 { 388 unsigned int i; 389 struct stats time_stats, mem_stats; 390 double time_average, time_stddev; 391 double mem_average, mem_stddev; 392 393 init_stats(&time_stats); 394 init_stats(&mem_stats); 395 396 pr_debug(" Build-id%s injection benchmark\n", build_id_all ? "-all" : ""); 397 398 for (i = 0; i < iterations; i++) { 399 struct timeval start, end, diff; 400 u64 runtime_us, max_rss; 401 402 pr_debug(" Iteration #%d\n", i+1); 403 404 if (setup_injection(data, build_id_all) < 0) { 405 printf(" Build-id injection setup failed\n"); 406 break; 407 } 408 409 gettimeofday(&start, NULL); 410 if (inject_build_id(data, &max_rss) < 0) { 411 printf(" Build-id injection failed\n"); 412 break; 413 } 414 415 gettimeofday(&end, NULL); 416 timersub(&end, &start, &diff); 417 runtime_us = diff.tv_sec * USEC_PER_SEC + diff.tv_usec; 418 update_stats(&time_stats, runtime_us); 419 update_stats(&mem_stats, max_rss); 420 421 pthread_join(data->th, NULL); 422 } 423 424 time_average = avg_stats(&time_stats) / USEC_PER_MSEC; 425 time_stddev = stddev_stats(&time_stats) / USEC_PER_MSEC; 426 printf(" Average build-id%s injection took: %.3f msec (+- %.3f msec)\n", 427 build_id_all ? "-all" : "", time_average, time_stddev); 428 429 /* each iteration, it processes MMAP2 + BUILD_ID + nr_samples * SAMPLE */ 430 time_average = avg_stats(&time_stats) / (nr_mmaps * (nr_samples + 2)); 431 time_stddev = stddev_stats(&time_stats) / (nr_mmaps * (nr_samples + 2)); 432 printf(" Average time per event: %.3f usec (+- %.3f usec)\n", 433 time_average, time_stddev); 434 435 mem_average = avg_stats(&mem_stats); 436 mem_stddev = stddev_stats(&mem_stats); 437 printf(" Average memory usage: %.0f KB (+- %.0f KB)\n", 438 mem_average, mem_stddev); 439 } 440 441 static int do_inject_loops(struct bench_data *data) 442 { 443 444 srand(time(NULL)); 445 symbol__init(NULL); 446 447 bench_sample_type = PERF_SAMPLE_IDENTIFIER | PERF_SAMPLE_IP; 448 bench_sample_type |= PERF_SAMPLE_TID | PERF_SAMPLE_TIME; 449 bench_id_hdr_size = 32; 450 451 collect_dso(); 452 if (nr_dsos == 0) { 453 printf(" Cannot collect DSOs for injection\n"); 454 return -1; 455 } 456 457 do_inject_loop(data, false); 458 do_inject_loop(data, true); 459 460 release_dso(); 461 return 0; 462 } 463 464 int bench_inject_build_id(int argc, const char **argv) 465 { 466 struct bench_data data; 467 468 argc = parse_options(argc, argv, options, bench_usage, 0); 469 if (argc) { 470 usage_with_options(bench_usage, options); 471 exit(EXIT_FAILURE); 472 } 473 474 return do_inject_loops(&data); 475 } 476 477