1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org> 4 */ 5 6 #define _GNU_SOURCE 7 #include <getopt.h> 8 #include <stdlib.h> 9 #include <string.h> 10 #include <signal.h> 11 #include <unistd.h> 12 #include <errno.h> 13 #include <stdio.h> 14 #include <time.h> 15 #include <sched.h> 16 17 #include "utils.h" 18 #include "osnoise.h" 19 20 struct osnoise_hist_params { 21 char *cpus; 22 cpu_set_t monitored_cpus; 23 char *trace_output; 24 char *cgroup_name; 25 unsigned long long runtime; 26 unsigned long long period; 27 long long threshold; 28 long long stop_us; 29 long long stop_total_us; 30 int sleep_time; 31 int duration; 32 int set_sched; 33 int output_divisor; 34 int cgroup; 35 int hk_cpus; 36 cpu_set_t hk_cpu_set; 37 struct sched_attr sched_param; 38 struct trace_events *events; 39 char no_header; 40 char no_summary; 41 char no_index; 42 char with_zeros; 43 int bucket_size; 44 int entries; 45 int warmup; 46 int buffer_size; 47 }; 48 49 struct osnoise_hist_cpu { 50 int *samples; 51 int count; 52 53 unsigned long long min_sample; 54 unsigned long long sum_sample; 55 unsigned long long max_sample; 56 57 }; 58 59 struct osnoise_hist_data { 60 struct tracefs_hist *trace_hist; 61 struct osnoise_hist_cpu *hist; 62 int entries; 63 int bucket_size; 64 int nr_cpus; 65 }; 66 67 /* 68 * osnoise_free_histogram - free runtime data 69 */ 70 static void 71 osnoise_free_histogram(struct osnoise_hist_data *data) 72 { 73 int cpu; 74 75 /* one histogram for IRQ and one for thread, per CPU */ 76 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 77 if (data->hist[cpu].samples) 78 free(data->hist[cpu].samples); 79 } 80 81 /* one set of histograms per CPU */ 82 if (data->hist) 83 free(data->hist); 84 85 free(data); 86 } 87 88 /* 89 * osnoise_alloc_histogram - alloc runtime data 90 */ 91 static struct osnoise_hist_data 92 *osnoise_alloc_histogram(int nr_cpus, int entries, int bucket_size) 93 { 94 struct osnoise_hist_data *data; 95 int cpu; 96 97 data = calloc(1, sizeof(*data)); 98 if (!data) 99 return NULL; 100 101 data->entries = entries; 102 data->bucket_size = bucket_size; 103 data->nr_cpus = nr_cpus; 104 105 data->hist = calloc(1, sizeof(*data->hist) * nr_cpus); 106 if (!data->hist) 107 goto cleanup; 108 109 for (cpu = 0; cpu < nr_cpus; cpu++) { 110 data->hist[cpu].samples = calloc(1, sizeof(*data->hist->samples) * (entries + 1)); 111 if (!data->hist[cpu].samples) 112 goto cleanup; 113 } 114 115 /* set the min to max */ 116 for (cpu = 0; cpu < nr_cpus; cpu++) 117 data->hist[cpu].min_sample = ~0; 118 119 return data; 120 121 cleanup: 122 osnoise_free_histogram(data); 123 return NULL; 124 } 125 126 static void osnoise_hist_update_multiple(struct osnoise_tool *tool, int cpu, 127 unsigned long long duration, int count) 128 { 129 struct osnoise_hist_params *params = tool->params; 130 struct osnoise_hist_data *data = tool->data; 131 unsigned long long total_duration; 132 int entries = data->entries; 133 int bucket; 134 int *hist; 135 136 if (params->output_divisor) 137 duration = duration / params->output_divisor; 138 139 bucket = duration / data->bucket_size; 140 141 total_duration = duration * count; 142 143 hist = data->hist[cpu].samples; 144 data->hist[cpu].count += count; 145 update_min(&data->hist[cpu].min_sample, &duration); 146 update_sum(&data->hist[cpu].sum_sample, &total_duration); 147 update_max(&data->hist[cpu].max_sample, &duration); 148 149 if (bucket < entries) 150 hist[bucket] += count; 151 else 152 hist[entries] += count; 153 } 154 155 /* 156 * osnoise_destroy_trace_hist - disable events used to collect histogram 157 */ 158 static void osnoise_destroy_trace_hist(struct osnoise_tool *tool) 159 { 160 struct osnoise_hist_data *data = tool->data; 161 162 tracefs_hist_pause(tool->trace.inst, data->trace_hist); 163 tracefs_hist_destroy(tool->trace.inst, data->trace_hist); 164 } 165 166 /* 167 * osnoise_init_trace_hist - enable events used to collect histogram 168 */ 169 static int osnoise_init_trace_hist(struct osnoise_tool *tool) 170 { 171 struct osnoise_hist_params *params = tool->params; 172 struct osnoise_hist_data *data = tool->data; 173 int bucket_size; 174 char buff[128]; 175 int retval = 0; 176 177 /* 178 * Set the size of the bucket. 179 */ 180 bucket_size = params->output_divisor * params->bucket_size; 181 snprintf(buff, sizeof(buff), "duration.buckets=%d", bucket_size); 182 183 data->trace_hist = tracefs_hist_alloc(tool->trace.tep, "osnoise", "sample_threshold", 184 buff, TRACEFS_HIST_KEY_NORMAL); 185 if (!data->trace_hist) 186 return 1; 187 188 retval = tracefs_hist_add_key(data->trace_hist, "cpu", 0); 189 if (retval) 190 goto out_err; 191 192 retval = tracefs_hist_start(tool->trace.inst, data->trace_hist); 193 if (retval) 194 goto out_err; 195 196 return 0; 197 198 out_err: 199 osnoise_destroy_trace_hist(tool); 200 return 1; 201 } 202 203 /* 204 * osnoise_read_trace_hist - parse histogram file and file osnoise histogram 205 */ 206 static void osnoise_read_trace_hist(struct osnoise_tool *tool) 207 { 208 struct osnoise_hist_data *data = tool->data; 209 long long cpu, counter, duration; 210 char *content, *position; 211 212 tracefs_hist_pause(tool->trace.inst, data->trace_hist); 213 214 content = tracefs_event_file_read(tool->trace.inst, "osnoise", 215 "sample_threshold", 216 "hist", NULL); 217 if (!content) 218 return; 219 220 position = content; 221 while (true) { 222 position = strstr(position, "duration: ~"); 223 if (!position) 224 break; 225 position += strlen("duration: ~"); 226 duration = get_llong_from_str(position); 227 if (duration == -1) 228 err_msg("error reading duration from histogram\n"); 229 230 position = strstr(position, "cpu:"); 231 if (!position) 232 break; 233 position += strlen("cpu: "); 234 cpu = get_llong_from_str(position); 235 if (cpu == -1) 236 err_msg("error reading cpu from histogram\n"); 237 238 position = strstr(position, "hitcount:"); 239 if (!position) 240 break; 241 position += strlen("hitcount: "); 242 counter = get_llong_from_str(position); 243 if (counter == -1) 244 err_msg("error reading counter from histogram\n"); 245 246 osnoise_hist_update_multiple(tool, cpu, duration, counter); 247 } 248 free(content); 249 } 250 251 /* 252 * osnoise_hist_header - print the header of the tracer to the output 253 */ 254 static void osnoise_hist_header(struct osnoise_tool *tool) 255 { 256 struct osnoise_hist_params *params = tool->params; 257 struct osnoise_hist_data *data = tool->data; 258 struct trace_seq *s = tool->trace.seq; 259 char duration[26]; 260 int cpu; 261 262 if (params->no_header) 263 return; 264 265 get_duration(tool->start_time, duration, sizeof(duration)); 266 trace_seq_printf(s, "# RTLA osnoise histogram\n"); 267 trace_seq_printf(s, "# Time unit is %s (%s)\n", 268 params->output_divisor == 1 ? "nanoseconds" : "microseconds", 269 params->output_divisor == 1 ? "ns" : "us"); 270 271 trace_seq_printf(s, "# Duration: %s\n", duration); 272 273 if (!params->no_index) 274 trace_seq_printf(s, "Index"); 275 276 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 277 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus)) 278 continue; 279 280 if (!data->hist[cpu].count) 281 continue; 282 283 trace_seq_printf(s, " CPU-%03d", cpu); 284 } 285 trace_seq_printf(s, "\n"); 286 287 trace_seq_do_printf(s); 288 trace_seq_reset(s); 289 } 290 291 /* 292 * osnoise_print_summary - print the summary of the hist data to the output 293 */ 294 static void 295 osnoise_print_summary(struct osnoise_hist_params *params, 296 struct trace_instance *trace, 297 struct osnoise_hist_data *data) 298 { 299 int cpu; 300 301 if (params->no_summary) 302 return; 303 304 if (!params->no_index) 305 trace_seq_printf(trace->seq, "count:"); 306 307 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 308 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus)) 309 continue; 310 311 if (!data->hist[cpu].count) 312 continue; 313 314 trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].count); 315 } 316 trace_seq_printf(trace->seq, "\n"); 317 318 if (!params->no_index) 319 trace_seq_printf(trace->seq, "min: "); 320 321 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 322 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus)) 323 continue; 324 325 if (!data->hist[cpu].count) 326 continue; 327 328 trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].min_sample); 329 330 } 331 trace_seq_printf(trace->seq, "\n"); 332 333 if (!params->no_index) 334 trace_seq_printf(trace->seq, "avg: "); 335 336 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 337 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus)) 338 continue; 339 340 if (!data->hist[cpu].count) 341 continue; 342 343 if (data->hist[cpu].count) 344 trace_seq_printf(trace->seq, "%9.2f ", 345 ((double) data->hist[cpu].sum_sample) / data->hist[cpu].count); 346 else 347 trace_seq_printf(trace->seq, " - "); 348 } 349 trace_seq_printf(trace->seq, "\n"); 350 351 if (!params->no_index) 352 trace_seq_printf(trace->seq, "max: "); 353 354 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 355 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus)) 356 continue; 357 358 if (!data->hist[cpu].count) 359 continue; 360 361 trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].max_sample); 362 363 } 364 trace_seq_printf(trace->seq, "\n"); 365 trace_seq_do_printf(trace->seq); 366 trace_seq_reset(trace->seq); 367 } 368 369 /* 370 * osnoise_print_stats - print data for all CPUs 371 */ 372 static void 373 osnoise_print_stats(struct osnoise_hist_params *params, struct osnoise_tool *tool) 374 { 375 struct osnoise_hist_data *data = tool->data; 376 struct trace_instance *trace = &tool->trace; 377 int bucket, cpu; 378 int total; 379 380 osnoise_hist_header(tool); 381 382 for (bucket = 0; bucket < data->entries; bucket++) { 383 total = 0; 384 385 if (!params->no_index) 386 trace_seq_printf(trace->seq, "%-6d", 387 bucket * data->bucket_size); 388 389 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 390 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus)) 391 continue; 392 393 if (!data->hist[cpu].count) 394 continue; 395 396 total += data->hist[cpu].samples[bucket]; 397 trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].samples[bucket]); 398 } 399 400 if (total == 0 && !params->with_zeros) { 401 trace_seq_reset(trace->seq); 402 continue; 403 } 404 405 trace_seq_printf(trace->seq, "\n"); 406 trace_seq_do_printf(trace->seq); 407 trace_seq_reset(trace->seq); 408 } 409 410 if (!params->no_index) 411 trace_seq_printf(trace->seq, "over: "); 412 413 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 414 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus)) 415 continue; 416 417 if (!data->hist[cpu].count) 418 continue; 419 420 trace_seq_printf(trace->seq, "%9d ", 421 data->hist[cpu].samples[data->entries]); 422 } 423 trace_seq_printf(trace->seq, "\n"); 424 trace_seq_do_printf(trace->seq); 425 trace_seq_reset(trace->seq); 426 427 osnoise_print_summary(params, trace, data); 428 } 429 430 /* 431 * osnoise_hist_usage - prints osnoise hist usage message 432 */ 433 static void osnoise_hist_usage(char *usage) 434 { 435 int i; 436 437 static const char * const msg[] = { 438 "", 439 " usage: rtla osnoise hist [-h] [-D] [-d s] [-a us] [-p us] [-r us] [-s us] [-S us] \\", 440 " [-T us] [-t[file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] \\", 441 " [-c cpu-list] [-H cpu-list] [-P priority] [-b N] [-E N] [--no-header] [--no-summary] \\", 442 " [--no-index] [--with-zeros] [-C[=cgroup_name]] [--warm-up]", 443 "", 444 " -h/--help: print this menu", 445 " -a/--auto: set automatic trace mode, stopping the session if argument in us sample is hit", 446 " -p/--period us: osnoise period in us", 447 " -r/--runtime us: osnoise runtime in us", 448 " -s/--stop us: stop trace if a single sample is higher than the argument in us", 449 " -S/--stop-total us: stop trace if the total sample is higher than the argument in us", 450 " -T/--threshold us: the minimum delta to be considered a noise", 451 " -c/--cpus cpu-list: list of cpus to run osnoise threads", 452 " -H/--house-keeping cpus: run rtla control threads only on the given cpus", 453 " -C/--cgroup[=cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited", 454 " -d/--duration time[s|m|h|d]: duration of the session", 455 " -D/--debug: print debug info", 456 " -t/--trace[file]: save the stopped trace to [file|osnoise_trace.txt]", 457 " -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed", 458 " --filter <filter>: enable a trace event filter to the previous -e event", 459 " --trigger <trigger>: enable a trace event trigger to the previous -e event", 460 " -b/--bucket-size N: set the histogram bucket size (default 1)", 461 " -E/--entries N: set the number of entries of the histogram (default 256)", 462 " --no-header: do not print header", 463 " --no-summary: do not print summary", 464 " --no-index: do not print index", 465 " --with-zeros: print zero only entries", 466 " -P/--priority o:prio|r:prio|f:prio|d:runtime:period: set scheduling parameters", 467 " o:prio - use SCHED_OTHER with prio", 468 " r:prio - use SCHED_RR with prio", 469 " f:prio - use SCHED_FIFO with prio", 470 " d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period", 471 " in nanoseconds", 472 " --warm-up: let the workload run for s seconds before collecting data", 473 " --trace-buffer-size kB: set the per-cpu trace buffer size in kB", 474 NULL, 475 }; 476 477 if (usage) 478 fprintf(stderr, "%s\n", usage); 479 480 fprintf(stderr, "rtla osnoise hist: a per-cpu histogram of the OS noise (version %s)\n", 481 VERSION); 482 483 for (i = 0; msg[i]; i++) 484 fprintf(stderr, "%s\n", msg[i]); 485 486 if (usage) 487 exit(EXIT_FAILURE); 488 489 exit(EXIT_SUCCESS); 490 } 491 492 /* 493 * osnoise_hist_parse_args - allocs, parse and fill the cmd line parameters 494 */ 495 static struct osnoise_hist_params 496 *osnoise_hist_parse_args(int argc, char *argv[]) 497 { 498 struct osnoise_hist_params *params; 499 struct trace_events *tevent; 500 int retval; 501 int c; 502 503 params = calloc(1, sizeof(*params)); 504 if (!params) 505 exit(1); 506 507 /* display data in microseconds */ 508 params->output_divisor = 1000; 509 params->bucket_size = 1; 510 params->entries = 256; 511 512 while (1) { 513 static struct option long_options[] = { 514 {"auto", required_argument, 0, 'a'}, 515 {"bucket-size", required_argument, 0, 'b'}, 516 {"entries", required_argument, 0, 'E'}, 517 {"cpus", required_argument, 0, 'c'}, 518 {"cgroup", optional_argument, 0, 'C'}, 519 {"debug", no_argument, 0, 'D'}, 520 {"duration", required_argument, 0, 'd'}, 521 {"house-keeping", required_argument, 0, 'H'}, 522 {"help", no_argument, 0, 'h'}, 523 {"period", required_argument, 0, 'p'}, 524 {"priority", required_argument, 0, 'P'}, 525 {"runtime", required_argument, 0, 'r'}, 526 {"stop", required_argument, 0, 's'}, 527 {"stop-total", required_argument, 0, 'S'}, 528 {"trace", optional_argument, 0, 't'}, 529 {"event", required_argument, 0, 'e'}, 530 {"threshold", required_argument, 0, 'T'}, 531 {"no-header", no_argument, 0, '0'}, 532 {"no-summary", no_argument, 0, '1'}, 533 {"no-index", no_argument, 0, '2'}, 534 {"with-zeros", no_argument, 0, '3'}, 535 {"trigger", required_argument, 0, '4'}, 536 {"filter", required_argument, 0, '5'}, 537 {"warm-up", required_argument, 0, '6'}, 538 {"trace-buffer-size", required_argument, 0, '7'}, 539 {0, 0, 0, 0} 540 }; 541 542 /* getopt_long stores the option index here. */ 543 int option_index = 0; 544 545 c = getopt_long(argc, argv, "a:c:C::b:d:e:E:DhH:p:P:r:s:S:t::T:01234:5:6:7:", 546 long_options, &option_index); 547 548 /* detect the end of the options. */ 549 if (c == -1) 550 break; 551 552 switch (c) { 553 case 'a': 554 /* set sample stop to auto_thresh */ 555 params->stop_us = get_llong_from_str(optarg); 556 557 /* set sample threshold to 1 */ 558 params->threshold = 1; 559 560 /* set trace */ 561 params->trace_output = "osnoise_trace.txt"; 562 563 break; 564 case 'b': 565 params->bucket_size = get_llong_from_str(optarg); 566 if ((params->bucket_size == 0) || (params->bucket_size >= 1000000)) 567 osnoise_hist_usage("Bucket size needs to be > 0 and <= 1000000\n"); 568 break; 569 case 'c': 570 retval = parse_cpu_set(optarg, ¶ms->monitored_cpus); 571 if (retval) 572 osnoise_hist_usage("\nInvalid -c cpu list\n"); 573 params->cpus = optarg; 574 break; 575 case 'C': 576 params->cgroup = 1; 577 if (!optarg) { 578 /* will inherit this cgroup */ 579 params->cgroup_name = NULL; 580 } else if (*optarg == '=') { 581 /* skip the = */ 582 params->cgroup_name = ++optarg; 583 } 584 break; 585 case 'D': 586 config_debug = 1; 587 break; 588 case 'd': 589 params->duration = parse_seconds_duration(optarg); 590 if (!params->duration) 591 osnoise_hist_usage("Invalid -D duration\n"); 592 break; 593 case 'e': 594 tevent = trace_event_alloc(optarg); 595 if (!tevent) { 596 err_msg("Error alloc trace event"); 597 exit(EXIT_FAILURE); 598 } 599 600 if (params->events) 601 tevent->next = params->events; 602 603 params->events = tevent; 604 break; 605 case 'E': 606 params->entries = get_llong_from_str(optarg); 607 if ((params->entries < 10) || (params->entries > 9999999)) 608 osnoise_hist_usage("Entries must be > 10 and < 9999999\n"); 609 break; 610 case 'h': 611 case '?': 612 osnoise_hist_usage(NULL); 613 break; 614 case 'H': 615 params->hk_cpus = 1; 616 retval = parse_cpu_set(optarg, ¶ms->hk_cpu_set); 617 if (retval) { 618 err_msg("Error parsing house keeping CPUs\n"); 619 exit(EXIT_FAILURE); 620 } 621 break; 622 case 'p': 623 params->period = get_llong_from_str(optarg); 624 if (params->period > 10000000) 625 osnoise_hist_usage("Period longer than 10 s\n"); 626 break; 627 case 'P': 628 retval = parse_prio(optarg, ¶ms->sched_param); 629 if (retval == -1) 630 osnoise_hist_usage("Invalid -P priority"); 631 params->set_sched = 1; 632 break; 633 case 'r': 634 params->runtime = get_llong_from_str(optarg); 635 if (params->runtime < 100) 636 osnoise_hist_usage("Runtime shorter than 100 us\n"); 637 break; 638 case 's': 639 params->stop_us = get_llong_from_str(optarg); 640 break; 641 case 'S': 642 params->stop_total_us = get_llong_from_str(optarg); 643 break; 644 case 'T': 645 params->threshold = get_llong_from_str(optarg); 646 break; 647 case 't': 648 if (optarg) { 649 if (optarg[0] == '=') 650 params->trace_output = &optarg[1]; 651 else 652 params->trace_output = &optarg[0]; 653 } else if (optind < argc && argv[optind][0] != '0') 654 params->trace_output = argv[optind]; 655 else 656 params->trace_output = "osnoise_trace.txt"; 657 break; 658 case '0': /* no header */ 659 params->no_header = 1; 660 break; 661 case '1': /* no summary */ 662 params->no_summary = 1; 663 break; 664 case '2': /* no index */ 665 params->no_index = 1; 666 break; 667 case '3': /* with zeros */ 668 params->with_zeros = 1; 669 break; 670 case '4': /* trigger */ 671 if (params->events) { 672 retval = trace_event_add_trigger(params->events, optarg); 673 if (retval) { 674 err_msg("Error adding trigger %s\n", optarg); 675 exit(EXIT_FAILURE); 676 } 677 } else { 678 osnoise_hist_usage("--trigger requires a previous -e\n"); 679 } 680 break; 681 case '5': /* filter */ 682 if (params->events) { 683 retval = trace_event_add_filter(params->events, optarg); 684 if (retval) { 685 err_msg("Error adding filter %s\n", optarg); 686 exit(EXIT_FAILURE); 687 } 688 } else { 689 osnoise_hist_usage("--filter requires a previous -e\n"); 690 } 691 break; 692 case '6': 693 params->warmup = get_llong_from_str(optarg); 694 break; 695 case '7': 696 params->buffer_size = get_llong_from_str(optarg); 697 break; 698 default: 699 osnoise_hist_usage("Invalid option"); 700 } 701 } 702 703 if (geteuid()) { 704 err_msg("rtla needs root permission\n"); 705 exit(EXIT_FAILURE); 706 } 707 708 if (params->no_index && !params->with_zeros) 709 osnoise_hist_usage("no-index set and with-zeros not set - it does not make sense"); 710 711 return params; 712 } 713 714 /* 715 * osnoise_hist_apply_config - apply the hist configs to the initialized tool 716 */ 717 static int 718 osnoise_hist_apply_config(struct osnoise_tool *tool, struct osnoise_hist_params *params) 719 { 720 int retval; 721 722 if (!params->sleep_time) 723 params->sleep_time = 1; 724 725 if (params->cpus) { 726 retval = osnoise_set_cpus(tool->context, params->cpus); 727 if (retval) { 728 err_msg("Failed to apply CPUs config\n"); 729 goto out_err; 730 } 731 } 732 733 if (params->runtime || params->period) { 734 retval = osnoise_set_runtime_period(tool->context, 735 params->runtime, 736 params->period); 737 if (retval) { 738 err_msg("Failed to set runtime and/or period\n"); 739 goto out_err; 740 } 741 } 742 743 if (params->stop_us) { 744 retval = osnoise_set_stop_us(tool->context, params->stop_us); 745 if (retval) { 746 err_msg("Failed to set stop us\n"); 747 goto out_err; 748 } 749 } 750 751 if (params->stop_total_us) { 752 retval = osnoise_set_stop_total_us(tool->context, params->stop_total_us); 753 if (retval) { 754 err_msg("Failed to set stop total us\n"); 755 goto out_err; 756 } 757 } 758 759 if (params->threshold) { 760 retval = osnoise_set_tracing_thresh(tool->context, params->threshold); 761 if (retval) { 762 err_msg("Failed to set tracing_thresh\n"); 763 goto out_err; 764 } 765 } 766 767 if (params->hk_cpus) { 768 retval = sched_setaffinity(getpid(), sizeof(params->hk_cpu_set), 769 ¶ms->hk_cpu_set); 770 if (retval == -1) { 771 err_msg("Failed to set rtla to the house keeping CPUs\n"); 772 goto out_err; 773 } 774 } else if (params->cpus) { 775 /* 776 * Even if the user do not set a house-keeping CPU, try to 777 * move rtla to a CPU set different to the one where the user 778 * set the workload to run. 779 * 780 * No need to check results as this is an automatic attempt. 781 */ 782 auto_house_keeping(¶ms->monitored_cpus); 783 } 784 785 return 0; 786 787 out_err: 788 return -1; 789 } 790 791 /* 792 * osnoise_init_hist - initialize a osnoise hist tool with parameters 793 */ 794 static struct osnoise_tool 795 *osnoise_init_hist(struct osnoise_hist_params *params) 796 { 797 struct osnoise_tool *tool; 798 int nr_cpus; 799 800 nr_cpus = sysconf(_SC_NPROCESSORS_CONF); 801 802 tool = osnoise_init_tool("osnoise_hist"); 803 if (!tool) 804 return NULL; 805 806 tool->data = osnoise_alloc_histogram(nr_cpus, params->entries, params->bucket_size); 807 if (!tool->data) 808 goto out_err; 809 810 tool->params = params; 811 812 return tool; 813 814 out_err: 815 osnoise_destroy_tool(tool); 816 return NULL; 817 } 818 819 static int stop_tracing; 820 static void stop_hist(int sig) 821 { 822 stop_tracing = 1; 823 } 824 825 /* 826 * osnoise_hist_set_signals - handles the signal to stop the tool 827 */ 828 static void 829 osnoise_hist_set_signals(struct osnoise_hist_params *params) 830 { 831 signal(SIGINT, stop_hist); 832 if (params->duration) { 833 signal(SIGALRM, stop_hist); 834 alarm(params->duration); 835 } 836 } 837 838 int osnoise_hist_main(int argc, char *argv[]) 839 { 840 struct osnoise_hist_params *params; 841 struct osnoise_tool *record = NULL; 842 struct osnoise_tool *tool = NULL; 843 struct trace_instance *trace; 844 int return_value = 1; 845 int retval; 846 847 params = osnoise_hist_parse_args(argc, argv); 848 if (!params) 849 exit(1); 850 851 tool = osnoise_init_hist(params); 852 if (!tool) { 853 err_msg("Could not init osnoise hist\n"); 854 goto out_exit; 855 } 856 857 retval = osnoise_hist_apply_config(tool, params); 858 if (retval) { 859 err_msg("Could not apply config\n"); 860 goto out_destroy; 861 } 862 863 trace = &tool->trace; 864 865 retval = enable_osnoise(trace); 866 if (retval) { 867 err_msg("Failed to enable osnoise tracer\n"); 868 goto out_destroy; 869 } 870 871 retval = osnoise_init_trace_hist(tool); 872 if (retval) 873 goto out_destroy; 874 875 if (params->set_sched) { 876 retval = set_comm_sched_attr("osnoise/", ¶ms->sched_param); 877 if (retval) { 878 err_msg("Failed to set sched parameters\n"); 879 goto out_free; 880 } 881 } 882 883 if (params->cgroup) { 884 retval = set_comm_cgroup("timerlat/", params->cgroup_name); 885 if (!retval) { 886 err_msg("Failed to move threads to cgroup\n"); 887 goto out_free; 888 } 889 } 890 891 if (params->trace_output) { 892 record = osnoise_init_trace_tool("osnoise"); 893 if (!record) { 894 err_msg("Failed to enable the trace instance\n"); 895 goto out_free; 896 } 897 898 if (params->events) { 899 retval = trace_events_enable(&record->trace, params->events); 900 if (retval) 901 goto out_hist; 902 } 903 904 if (params->buffer_size > 0) { 905 retval = trace_set_buffer_size(&record->trace, params->buffer_size); 906 if (retval) 907 goto out_hist; 908 } 909 } 910 911 /* 912 * Start the tracer here, after having set all instances. 913 * 914 * Let the trace instance start first for the case of hitting a stop 915 * tracing while enabling other instances. The trace instance is the 916 * one with most valuable information. 917 */ 918 if (params->trace_output) 919 trace_instance_start(&record->trace); 920 trace_instance_start(trace); 921 922 if (params->warmup > 0) { 923 debug_msg("Warming up for %d seconds\n", params->warmup); 924 sleep(params->warmup); 925 if (stop_tracing) 926 goto out_hist; 927 928 /* 929 * Clean up the buffer. The osnoise workload do not run 930 * with tracing off to avoid creating a performance penalty 931 * when not needed. 932 */ 933 retval = tracefs_instance_file_write(trace->inst, "trace", ""); 934 if (retval < 0) { 935 debug_msg("Error cleaning up the buffer"); 936 goto out_hist; 937 } 938 939 } 940 941 tool->start_time = time(NULL); 942 osnoise_hist_set_signals(params); 943 944 while (!stop_tracing) { 945 sleep(params->sleep_time); 946 947 retval = tracefs_iterate_raw_events(trace->tep, 948 trace->inst, 949 NULL, 950 0, 951 collect_registered_events, 952 trace); 953 if (retval < 0) { 954 err_msg("Error iterating on events\n"); 955 goto out_hist; 956 } 957 958 if (trace_is_off(&tool->trace, &record->trace)) 959 break; 960 } 961 962 osnoise_read_trace_hist(tool); 963 964 osnoise_print_stats(params, tool); 965 966 return_value = 0; 967 968 if (trace_is_off(&tool->trace, &record->trace)) { 969 printf("rtla osnoise hit stop tracing\n"); 970 if (params->trace_output) { 971 printf(" Saving trace to %s\n", params->trace_output); 972 save_trace_to_file(record->trace.inst, params->trace_output); 973 } 974 } 975 976 out_hist: 977 trace_events_destroy(&record->trace, params->events); 978 params->events = NULL; 979 out_free: 980 osnoise_free_histogram(tool->data); 981 out_destroy: 982 osnoise_destroy_tool(record); 983 osnoise_destroy_tool(tool); 984 free(params); 985 out_exit: 986 exit(return_value); 987 } 988