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 40 char no_header; 41 char no_summary; 42 char no_index; 43 char with_zeros; 44 int bucket_size; 45 int entries; 46 }; 47 48 struct osnoise_hist_cpu { 49 int *samples; 50 int count; 51 52 unsigned long long min_sample; 53 unsigned long long sum_sample; 54 unsigned long long max_sample; 55 56 }; 57 58 struct osnoise_hist_data { 59 struct tracefs_hist *trace_hist; 60 struct osnoise_hist_cpu *hist; 61 int entries; 62 int bucket_size; 63 int nr_cpus; 64 }; 65 66 /* 67 * osnoise_free_histogram - free runtime data 68 */ 69 static void 70 osnoise_free_histogram(struct osnoise_hist_data *data) 71 { 72 int cpu; 73 74 /* one histogram for IRQ and one for thread, per CPU */ 75 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 76 if (data->hist[cpu].samples) 77 free(data->hist[cpu].samples); 78 } 79 80 /* one set of histograms per CPU */ 81 if (data->hist) 82 free(data->hist); 83 84 free(data); 85 } 86 87 /* 88 * osnoise_alloc_histogram - alloc runtime data 89 */ 90 static struct osnoise_hist_data 91 *osnoise_alloc_histogram(int nr_cpus, int entries, int bucket_size) 92 { 93 struct osnoise_hist_data *data; 94 int cpu; 95 96 data = calloc(1, sizeof(*data)); 97 if (!data) 98 return NULL; 99 100 data->entries = entries; 101 data->bucket_size = bucket_size; 102 data->nr_cpus = nr_cpus; 103 104 data->hist = calloc(1, sizeof(*data->hist) * nr_cpus); 105 if (!data->hist) 106 goto cleanup; 107 108 for (cpu = 0; cpu < nr_cpus; cpu++) { 109 data->hist[cpu].samples = calloc(1, sizeof(*data->hist->samples) * (entries + 1)); 110 if (!data->hist[cpu].samples) 111 goto cleanup; 112 } 113 114 /* set the min to max */ 115 for (cpu = 0; cpu < nr_cpus; cpu++) 116 data->hist[cpu].min_sample = ~0; 117 118 return data; 119 120 cleanup: 121 osnoise_free_histogram(data); 122 return NULL; 123 } 124 125 static void osnoise_hist_update_multiple(struct osnoise_tool *tool, int cpu, 126 unsigned long long duration, int count) 127 { 128 struct osnoise_hist_params *params = tool->params; 129 struct osnoise_hist_data *data = tool->data; 130 unsigned long long total_duration; 131 int entries = data->entries; 132 int bucket; 133 int *hist; 134 135 if (params->output_divisor) 136 duration = duration / params->output_divisor; 137 138 if (data->bucket_size) 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]]", 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 NULL, 473 }; 474 475 if (usage) 476 fprintf(stderr, "%s\n", usage); 477 478 fprintf(stderr, "rtla osnoise hist: a per-cpu histogram of the OS noise (version %s)\n", 479 VERSION); 480 481 for (i = 0; msg[i]; i++) 482 fprintf(stderr, "%s\n", msg[i]); 483 exit(1); 484 } 485 486 /* 487 * osnoise_hist_parse_args - allocs, parse and fill the cmd line parameters 488 */ 489 static struct osnoise_hist_params 490 *osnoise_hist_parse_args(int argc, char *argv[]) 491 { 492 struct osnoise_hist_params *params; 493 struct trace_events *tevent; 494 int retval; 495 int c; 496 497 params = calloc(1, sizeof(*params)); 498 if (!params) 499 exit(1); 500 501 /* display data in microseconds */ 502 params->output_divisor = 1000; 503 params->bucket_size = 1; 504 params->entries = 256; 505 506 while (1) { 507 static struct option long_options[] = { 508 {"auto", required_argument, 0, 'a'}, 509 {"bucket-size", required_argument, 0, 'b'}, 510 {"entries", required_argument, 0, 'E'}, 511 {"cpus", required_argument, 0, 'c'}, 512 {"cgroup", optional_argument, 0, 'C'}, 513 {"debug", no_argument, 0, 'D'}, 514 {"duration", required_argument, 0, 'd'}, 515 {"house-keeping", required_argument, 0, 'H'}, 516 {"help", no_argument, 0, 'h'}, 517 {"period", required_argument, 0, 'p'}, 518 {"priority", required_argument, 0, 'P'}, 519 {"runtime", required_argument, 0, 'r'}, 520 {"stop", required_argument, 0, 's'}, 521 {"stop-total", required_argument, 0, 'S'}, 522 {"trace", optional_argument, 0, 't'}, 523 {"event", required_argument, 0, 'e'}, 524 {"threshold", required_argument, 0, 'T'}, 525 {"no-header", no_argument, 0, '0'}, 526 {"no-summary", no_argument, 0, '1'}, 527 {"no-index", no_argument, 0, '2'}, 528 {"with-zeros", no_argument, 0, '3'}, 529 {"trigger", required_argument, 0, '4'}, 530 {"filter", required_argument, 0, '5'}, 531 {0, 0, 0, 0} 532 }; 533 534 /* getopt_long stores the option index here. */ 535 int option_index = 0; 536 537 c = getopt_long(argc, argv, "a:c:C::b:d:e:E:DhH:p:P:r:s:S:t::T:01234:5:", 538 long_options, &option_index); 539 540 /* detect the end of the options. */ 541 if (c == -1) 542 break; 543 544 switch (c) { 545 case 'a': 546 /* set sample stop to auto_thresh */ 547 params->stop_us = get_llong_from_str(optarg); 548 549 /* set sample threshold to 1 */ 550 params->threshold = 1; 551 552 /* set trace */ 553 params->trace_output = "osnoise_trace.txt"; 554 555 break; 556 case 'b': 557 params->bucket_size = get_llong_from_str(optarg); 558 if ((params->bucket_size == 0) || (params->bucket_size >= 1000000)) 559 osnoise_hist_usage("Bucket size needs to be > 0 and <= 1000000\n"); 560 break; 561 case 'c': 562 retval = parse_cpu_set(optarg, ¶ms->monitored_cpus); 563 if (retval) 564 osnoise_hist_usage("\nInvalid -c cpu list\n"); 565 params->cpus = optarg; 566 break; 567 case 'C': 568 params->cgroup = 1; 569 if (!optarg) { 570 /* will inherit this cgroup */ 571 params->cgroup_name = NULL; 572 } else if (*optarg == '=') { 573 /* skip the = */ 574 params->cgroup_name = ++optarg; 575 } 576 break; 577 case 'D': 578 config_debug = 1; 579 break; 580 case 'd': 581 params->duration = parse_seconds_duration(optarg); 582 if (!params->duration) 583 osnoise_hist_usage("Invalid -D duration\n"); 584 break; 585 case 'e': 586 tevent = trace_event_alloc(optarg); 587 if (!tevent) { 588 err_msg("Error alloc trace event"); 589 exit(EXIT_FAILURE); 590 } 591 592 if (params->events) 593 tevent->next = params->events; 594 595 params->events = tevent; 596 break; 597 case 'E': 598 params->entries = get_llong_from_str(optarg); 599 if ((params->entries < 10) || (params->entries > 9999999)) 600 osnoise_hist_usage("Entries must be > 10 and < 9999999\n"); 601 break; 602 case 'h': 603 case '?': 604 osnoise_hist_usage(NULL); 605 break; 606 case 'H': 607 params->hk_cpus = 1; 608 retval = parse_cpu_set(optarg, ¶ms->hk_cpu_set); 609 if (retval) { 610 err_msg("Error parsing house keeping CPUs\n"); 611 exit(EXIT_FAILURE); 612 } 613 break; 614 case 'p': 615 params->period = get_llong_from_str(optarg); 616 if (params->period > 10000000) 617 osnoise_hist_usage("Period longer than 10 s\n"); 618 break; 619 case 'P': 620 retval = parse_prio(optarg, ¶ms->sched_param); 621 if (retval == -1) 622 osnoise_hist_usage("Invalid -P priority"); 623 params->set_sched = 1; 624 break; 625 case 'r': 626 params->runtime = get_llong_from_str(optarg); 627 if (params->runtime < 100) 628 osnoise_hist_usage("Runtime shorter than 100 us\n"); 629 break; 630 case 's': 631 params->stop_us = get_llong_from_str(optarg); 632 break; 633 case 'S': 634 params->stop_total_us = get_llong_from_str(optarg); 635 break; 636 case 'T': 637 params->threshold = get_llong_from_str(optarg); 638 break; 639 case 't': 640 if (optarg) 641 /* skip = */ 642 params->trace_output = &optarg[1]; 643 else 644 params->trace_output = "osnoise_trace.txt"; 645 break; 646 case '0': /* no header */ 647 params->no_header = 1; 648 break; 649 case '1': /* no summary */ 650 params->no_summary = 1; 651 break; 652 case '2': /* no index */ 653 params->no_index = 1; 654 break; 655 case '3': /* with zeros */ 656 params->with_zeros = 1; 657 break; 658 case '4': /* trigger */ 659 if (params->events) { 660 retval = trace_event_add_trigger(params->events, optarg); 661 if (retval) { 662 err_msg("Error adding trigger %s\n", optarg); 663 exit(EXIT_FAILURE); 664 } 665 } else { 666 osnoise_hist_usage("--trigger requires a previous -e\n"); 667 } 668 break; 669 case '5': /* filter */ 670 if (params->events) { 671 retval = trace_event_add_filter(params->events, optarg); 672 if (retval) { 673 err_msg("Error adding filter %s\n", optarg); 674 exit(EXIT_FAILURE); 675 } 676 } else { 677 osnoise_hist_usage("--filter requires a previous -e\n"); 678 } 679 break; 680 default: 681 osnoise_hist_usage("Invalid option"); 682 } 683 } 684 685 if (geteuid()) { 686 err_msg("rtla needs root permission\n"); 687 exit(EXIT_FAILURE); 688 } 689 690 if (params->no_index && !params->with_zeros) 691 osnoise_hist_usage("no-index set and with-zeros not set - it does not make sense"); 692 693 return params; 694 } 695 696 /* 697 * osnoise_hist_apply_config - apply the hist configs to the initialized tool 698 */ 699 static int 700 osnoise_hist_apply_config(struct osnoise_tool *tool, struct osnoise_hist_params *params) 701 { 702 int retval; 703 704 if (!params->sleep_time) 705 params->sleep_time = 1; 706 707 if (params->cpus) { 708 retval = osnoise_set_cpus(tool->context, params->cpus); 709 if (retval) { 710 err_msg("Failed to apply CPUs config\n"); 711 goto out_err; 712 } 713 } 714 715 if (params->runtime || params->period) { 716 retval = osnoise_set_runtime_period(tool->context, 717 params->runtime, 718 params->period); 719 if (retval) { 720 err_msg("Failed to set runtime and/or period\n"); 721 goto out_err; 722 } 723 } 724 725 if (params->stop_us) { 726 retval = osnoise_set_stop_us(tool->context, params->stop_us); 727 if (retval) { 728 err_msg("Failed to set stop us\n"); 729 goto out_err; 730 } 731 } 732 733 if (params->stop_total_us) { 734 retval = osnoise_set_stop_total_us(tool->context, params->stop_total_us); 735 if (retval) { 736 err_msg("Failed to set stop total us\n"); 737 goto out_err; 738 } 739 } 740 741 if (params->threshold) { 742 retval = osnoise_set_tracing_thresh(tool->context, params->threshold); 743 if (retval) { 744 err_msg("Failed to set tracing_thresh\n"); 745 goto out_err; 746 } 747 } 748 749 if (params->hk_cpus) { 750 retval = sched_setaffinity(getpid(), sizeof(params->hk_cpu_set), 751 ¶ms->hk_cpu_set); 752 if (retval == -1) { 753 err_msg("Failed to set rtla to the house keeping CPUs\n"); 754 goto out_err; 755 } 756 } else if (params->cpus) { 757 /* 758 * Even if the user do not set a house-keeping CPU, try to 759 * move rtla to a CPU set different to the one where the user 760 * set the workload to run. 761 * 762 * No need to check results as this is an automatic attempt. 763 */ 764 auto_house_keeping(¶ms->monitored_cpus); 765 } 766 767 return 0; 768 769 out_err: 770 return -1; 771 } 772 773 /* 774 * osnoise_init_hist - initialize a osnoise hist tool with parameters 775 */ 776 static struct osnoise_tool 777 *osnoise_init_hist(struct osnoise_hist_params *params) 778 { 779 struct osnoise_tool *tool; 780 int nr_cpus; 781 782 nr_cpus = sysconf(_SC_NPROCESSORS_CONF); 783 784 tool = osnoise_init_tool("osnoise_hist"); 785 if (!tool) 786 return NULL; 787 788 tool->data = osnoise_alloc_histogram(nr_cpus, params->entries, params->bucket_size); 789 if (!tool->data) 790 goto out_err; 791 792 tool->params = params; 793 794 return tool; 795 796 out_err: 797 osnoise_destroy_tool(tool); 798 return NULL; 799 } 800 801 static int stop_tracing; 802 static void stop_hist(int sig) 803 { 804 stop_tracing = 1; 805 } 806 807 /* 808 * osnoise_hist_set_signals - handles the signal to stop the tool 809 */ 810 static void 811 osnoise_hist_set_signals(struct osnoise_hist_params *params) 812 { 813 signal(SIGINT, stop_hist); 814 if (params->duration) { 815 signal(SIGALRM, stop_hist); 816 alarm(params->duration); 817 } 818 } 819 820 int osnoise_hist_main(int argc, char *argv[]) 821 { 822 struct osnoise_hist_params *params; 823 struct osnoise_tool *record = NULL; 824 struct osnoise_tool *tool = NULL; 825 struct trace_instance *trace; 826 int return_value = 1; 827 int retval; 828 829 params = osnoise_hist_parse_args(argc, argv); 830 if (!params) 831 exit(1); 832 833 tool = osnoise_init_hist(params); 834 if (!tool) { 835 err_msg("Could not init osnoise hist\n"); 836 goto out_exit; 837 } 838 839 retval = osnoise_hist_apply_config(tool, params); 840 if (retval) { 841 err_msg("Could not apply config\n"); 842 goto out_destroy; 843 } 844 845 trace = &tool->trace; 846 847 retval = enable_osnoise(trace); 848 if (retval) { 849 err_msg("Failed to enable osnoise tracer\n"); 850 goto out_destroy; 851 } 852 853 retval = osnoise_init_trace_hist(tool); 854 if (retval) 855 goto out_destroy; 856 857 if (params->set_sched) { 858 retval = set_comm_sched_attr("osnoise/", ¶ms->sched_param); 859 if (retval) { 860 err_msg("Failed to set sched parameters\n"); 861 goto out_free; 862 } 863 } 864 865 if (params->cgroup) { 866 retval = set_comm_cgroup("timerlat/", params->cgroup_name); 867 if (!retval) { 868 err_msg("Failed to move threads to cgroup\n"); 869 goto out_free; 870 } 871 } 872 873 if (params->trace_output) { 874 record = osnoise_init_trace_tool("osnoise"); 875 if (!record) { 876 err_msg("Failed to enable the trace instance\n"); 877 goto out_free; 878 } 879 880 if (params->events) { 881 retval = trace_events_enable(&record->trace, params->events); 882 if (retval) 883 goto out_hist; 884 } 885 886 } 887 888 /* 889 * Start the tracer here, after having set all instances. 890 * 891 * Let the trace instance start first for the case of hitting a stop 892 * tracing while enabling other instances. The trace instance is the 893 * one with most valuable information. 894 */ 895 if (params->trace_output) 896 trace_instance_start(&record->trace); 897 trace_instance_start(trace); 898 899 tool->start_time = time(NULL); 900 osnoise_hist_set_signals(params); 901 902 while (!stop_tracing) { 903 sleep(params->sleep_time); 904 905 retval = tracefs_iterate_raw_events(trace->tep, 906 trace->inst, 907 NULL, 908 0, 909 collect_registered_events, 910 trace); 911 if (retval < 0) { 912 err_msg("Error iterating on events\n"); 913 goto out_hist; 914 } 915 916 if (trace_is_off(&tool->trace, &record->trace)) 917 break; 918 } 919 920 osnoise_read_trace_hist(tool); 921 922 osnoise_print_stats(params, tool); 923 924 return_value = 0; 925 926 if (trace_is_off(&tool->trace, &record->trace)) { 927 printf("rtla osnoise hit stop tracing\n"); 928 if (params->trace_output) { 929 printf(" Saving trace to %s\n", params->trace_output); 930 save_trace_to_file(record->trace.inst, params->trace_output); 931 } 932 } 933 934 out_hist: 935 trace_events_destroy(&record->trace, params->events); 936 params->events = NULL; 937 out_free: 938 osnoise_free_histogram(tool->data); 939 out_destroy: 940 osnoise_destroy_tool(record); 941 osnoise_destroy_tool(tool); 942 free(params); 943 out_exit: 944 exit(return_value); 945 } 946