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 <stdio.h> 13 #include <time.h> 14 #include <sched.h> 15 16 #include "osnoise.h" 17 #include "utils.h" 18 19 enum osnoise_mode { 20 MODE_OSNOISE = 0, 21 MODE_HWNOISE 22 }; 23 24 /* 25 * osnoise top parameters 26 */ 27 struct osnoise_top_params { 28 char *cpus; 29 cpu_set_t monitored_cpus; 30 char *trace_output; 31 char *cgroup_name; 32 unsigned long long runtime; 33 unsigned long long period; 34 long long threshold; 35 long long stop_us; 36 long long stop_total_us; 37 int sleep_time; 38 int duration; 39 int quiet; 40 int set_sched; 41 int cgroup; 42 int hk_cpus; 43 int warmup; 44 int buffer_size; 45 int pretty_output; 46 cpu_set_t hk_cpu_set; 47 struct sched_attr sched_param; 48 struct trace_events *events; 49 enum osnoise_mode mode; 50 }; 51 52 struct osnoise_top_cpu { 53 unsigned long long sum_runtime; 54 unsigned long long sum_noise; 55 unsigned long long max_noise; 56 unsigned long long max_sample; 57 58 unsigned long long hw_count; 59 unsigned long long nmi_count; 60 unsigned long long irq_count; 61 unsigned long long softirq_count; 62 unsigned long long thread_count; 63 64 int sum_cycles; 65 }; 66 67 struct osnoise_top_data { 68 struct osnoise_top_cpu *cpu_data; 69 int nr_cpus; 70 }; 71 72 /* 73 * osnoise_free_top - free runtime data 74 */ 75 static void 76 osnoise_free_top(struct osnoise_top_data *data) 77 { 78 free(data->cpu_data); 79 free(data); 80 } 81 82 /* 83 * osnoise_alloc_histogram - alloc runtime data 84 */ 85 static struct osnoise_top_data *osnoise_alloc_top(int nr_cpus) 86 { 87 struct osnoise_top_data *data; 88 89 data = calloc(1, sizeof(*data)); 90 if (!data) 91 return NULL; 92 93 data->nr_cpus = nr_cpus; 94 95 /* one set of histograms per CPU */ 96 data->cpu_data = calloc(1, sizeof(*data->cpu_data) * nr_cpus); 97 if (!data->cpu_data) 98 goto cleanup; 99 100 return data; 101 102 cleanup: 103 osnoise_free_top(data); 104 return NULL; 105 } 106 107 /* 108 * osnoise_top_handler - this is the handler for osnoise tracer events 109 */ 110 static int 111 osnoise_top_handler(struct trace_seq *s, struct tep_record *record, 112 struct tep_event *event, void *context) 113 { 114 struct trace_instance *trace = context; 115 struct osnoise_tool *tool; 116 unsigned long long val; 117 struct osnoise_top_cpu *cpu_data; 118 struct osnoise_top_data *data; 119 int cpu = record->cpu; 120 121 tool = container_of(trace, struct osnoise_tool, trace); 122 123 data = tool->data; 124 cpu_data = &data->cpu_data[cpu]; 125 126 cpu_data->sum_cycles++; 127 128 tep_get_field_val(s, event, "runtime", record, &val, 1); 129 update_sum(&cpu_data->sum_runtime, &val); 130 131 tep_get_field_val(s, event, "noise", record, &val, 1); 132 update_max(&cpu_data->max_noise, &val); 133 update_sum(&cpu_data->sum_noise, &val); 134 135 tep_get_field_val(s, event, "max_sample", record, &val, 1); 136 update_max(&cpu_data->max_sample, &val); 137 138 tep_get_field_val(s, event, "hw_count", record, &val, 1); 139 update_sum(&cpu_data->hw_count, &val); 140 141 tep_get_field_val(s, event, "nmi_count", record, &val, 1); 142 update_sum(&cpu_data->nmi_count, &val); 143 144 tep_get_field_val(s, event, "irq_count", record, &val, 1); 145 update_sum(&cpu_data->irq_count, &val); 146 147 tep_get_field_val(s, event, "softirq_count", record, &val, 1); 148 update_sum(&cpu_data->softirq_count, &val); 149 150 tep_get_field_val(s, event, "thread_count", record, &val, 1); 151 update_sum(&cpu_data->thread_count, &val); 152 153 return 0; 154 } 155 156 /* 157 * osnoise_top_header - print the header of the tool output 158 */ 159 static void osnoise_top_header(struct osnoise_tool *top) 160 { 161 struct osnoise_top_params *params = top->params; 162 struct trace_seq *s = top->trace.seq; 163 char duration[26]; 164 165 get_duration(top->start_time, duration, sizeof(duration)); 166 167 if (params->pretty_output) 168 trace_seq_printf(s, "\033[2;37;40m"); 169 170 trace_seq_printf(s, " "); 171 172 if (params->mode == MODE_OSNOISE) { 173 trace_seq_printf(s, "Operating System Noise"); 174 trace_seq_printf(s, " "); 175 } else if (params->mode == MODE_HWNOISE) { 176 trace_seq_printf(s, "Hardware-related Noise"); 177 } 178 179 trace_seq_printf(s, " "); 180 181 if (params->pretty_output) 182 trace_seq_printf(s, "\033[0;0;0m"); 183 trace_seq_printf(s, "\n"); 184 185 trace_seq_printf(s, "duration: %9s | time is in us\n", duration); 186 187 if (params->pretty_output) 188 trace_seq_printf(s, "\033[2;30;47m"); 189 190 trace_seq_printf(s, "CPU Period Runtime "); 191 trace_seq_printf(s, " Noise "); 192 trace_seq_printf(s, " %% CPU Aval "); 193 trace_seq_printf(s, " Max Noise Max Single "); 194 trace_seq_printf(s, " HW NMI"); 195 196 if (params->mode == MODE_HWNOISE) 197 goto eol; 198 199 trace_seq_printf(s, " IRQ Softirq Thread"); 200 201 eol: 202 if (params->pretty_output) 203 trace_seq_printf(s, "\033[0;0;0m"); 204 trace_seq_printf(s, "\n"); 205 } 206 207 /* 208 * clear_terminal - clears the output terminal 209 */ 210 static void clear_terminal(struct trace_seq *seq) 211 { 212 if (!config_debug) 213 trace_seq_printf(seq, "\033c"); 214 } 215 216 /* 217 * osnoise_top_print - prints the output of a given CPU 218 */ 219 static void osnoise_top_print(struct osnoise_tool *tool, int cpu) 220 { 221 struct osnoise_top_params *params = tool->params; 222 struct trace_seq *s = tool->trace.seq; 223 struct osnoise_top_cpu *cpu_data; 224 struct osnoise_top_data *data; 225 int percentage; 226 int decimal; 227 228 data = tool->data; 229 cpu_data = &data->cpu_data[cpu]; 230 231 if (!cpu_data->sum_runtime) 232 return; 233 234 percentage = ((cpu_data->sum_runtime - cpu_data->sum_noise) * 10000000) 235 / cpu_data->sum_runtime; 236 decimal = percentage % 100000; 237 percentage = percentage / 100000; 238 239 trace_seq_printf(s, "%3d #%-6d %12llu ", cpu, cpu_data->sum_cycles, cpu_data->sum_runtime); 240 trace_seq_printf(s, "%12llu ", cpu_data->sum_noise); 241 trace_seq_printf(s, " %3d.%05d", percentage, decimal); 242 trace_seq_printf(s, "%12llu %12llu", cpu_data->max_noise, cpu_data->max_sample); 243 244 trace_seq_printf(s, "%12llu ", cpu_data->hw_count); 245 trace_seq_printf(s, "%12llu ", cpu_data->nmi_count); 246 247 if (params->mode == MODE_HWNOISE) { 248 trace_seq_printf(s, "\n"); 249 return; 250 } 251 252 trace_seq_printf(s, "%12llu ", cpu_data->irq_count); 253 trace_seq_printf(s, "%12llu ", cpu_data->softirq_count); 254 trace_seq_printf(s, "%12llu\n", cpu_data->thread_count); 255 } 256 257 /* 258 * osnoise_print_stats - print data for all cpus 259 */ 260 static void 261 osnoise_print_stats(struct osnoise_top_params *params, struct osnoise_tool *top) 262 { 263 struct trace_instance *trace = &top->trace; 264 static int nr_cpus = -1; 265 int i; 266 267 if (nr_cpus == -1) 268 nr_cpus = sysconf(_SC_NPROCESSORS_CONF); 269 270 if (!params->quiet) 271 clear_terminal(trace->seq); 272 273 osnoise_top_header(top); 274 275 for (i = 0; i < nr_cpus; i++) { 276 if (params->cpus && !CPU_ISSET(i, ¶ms->monitored_cpus)) 277 continue; 278 osnoise_top_print(top, i); 279 } 280 281 trace_seq_do_printf(trace->seq); 282 trace_seq_reset(trace->seq); 283 osnoise_report_missed_events(top); 284 } 285 286 /* 287 * osnoise_top_usage - prints osnoise top usage message 288 */ 289 static void osnoise_top_usage(struct osnoise_top_params *params, char *usage) 290 { 291 int i; 292 293 static const char * const msg[] = { 294 " [-h] [-q] [-D] [-d s] [-a us] [-p us] [-r us] [-s us] [-S us] \\", 295 " [-T us] [-t[file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] \\", 296 " [-c cpu-list] [-H cpu-list] [-P priority] [-C[=cgroup_name]] [--warm-up s]", 297 "", 298 " -h/--help: print this menu", 299 " -a/--auto: set automatic trace mode, stopping the session if argument in us sample is hit", 300 " -p/--period us: osnoise period in us", 301 " -r/--runtime us: osnoise runtime in us", 302 " -s/--stop us: stop trace if a single sample is higher than the argument in us", 303 " -S/--stop-total us: stop trace if the total sample is higher than the argument in us", 304 " -T/--threshold us: the minimum delta to be considered a noise", 305 " -c/--cpus cpu-list: list of cpus to run osnoise threads", 306 " -H/--house-keeping cpus: run rtla control threads only on the given cpus", 307 " -C/--cgroup[=cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited", 308 " -d/--duration time[s|m|h|d]: duration of the session", 309 " -D/--debug: print debug info", 310 " -t/--trace[file]: save the stopped trace to [file|osnoise_trace.txt]", 311 " -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed", 312 " --filter <filter>: enable a trace event filter to the previous -e event", 313 " --trigger <trigger>: enable a trace event trigger to the previous -e event", 314 " -q/--quiet print only a summary at the end", 315 " -P/--priority o:prio|r:prio|f:prio|d:runtime:period : set scheduling parameters", 316 " o:prio - use SCHED_OTHER with prio", 317 " r:prio - use SCHED_RR with prio", 318 " f:prio - use SCHED_FIFO with prio", 319 " d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period", 320 " in nanoseconds", 321 " --warm-up s: let the workload run for s seconds before collecting data", 322 " --trace-buffer-size kB: set the per-cpu trace buffer size in kB", 323 NULL, 324 }; 325 326 if (usage) 327 fprintf(stderr, "%s\n", usage); 328 329 if (params->mode == MODE_OSNOISE) { 330 fprintf(stderr, 331 "rtla osnoise top: a per-cpu summary of the OS noise (version %s)\n", 332 VERSION); 333 334 fprintf(stderr, " usage: rtla osnoise [top]"); 335 } 336 337 if (params->mode == MODE_HWNOISE) { 338 fprintf(stderr, 339 "rtla hwnoise: a summary of hardware-related noise (version %s)\n", 340 VERSION); 341 342 fprintf(stderr, " usage: rtla hwnoise"); 343 } 344 345 for (i = 0; msg[i]; i++) 346 fprintf(stderr, "%s\n", msg[i]); 347 348 if (usage) 349 exit(EXIT_FAILURE); 350 351 exit(EXIT_SUCCESS); 352 } 353 354 /* 355 * osnoise_top_parse_args - allocs, parse and fill the cmd line parameters 356 */ 357 struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv) 358 { 359 struct osnoise_top_params *params; 360 struct trace_events *tevent; 361 int retval; 362 int c; 363 364 params = calloc(1, sizeof(*params)); 365 if (!params) 366 exit(1); 367 368 if (strcmp(argv[0], "hwnoise") == 0) { 369 params->mode = MODE_HWNOISE; 370 /* 371 * Reduce CPU usage for 75% to avoid killing the system. 372 */ 373 params->runtime = 750000; 374 params->period = 1000000; 375 } 376 377 while (1) { 378 static struct option long_options[] = { 379 {"auto", required_argument, 0, 'a'}, 380 {"cpus", required_argument, 0, 'c'}, 381 {"cgroup", optional_argument, 0, 'C'}, 382 {"debug", no_argument, 0, 'D'}, 383 {"duration", required_argument, 0, 'd'}, 384 {"event", required_argument, 0, 'e'}, 385 {"house-keeping", required_argument, 0, 'H'}, 386 {"help", no_argument, 0, 'h'}, 387 {"period", required_argument, 0, 'p'}, 388 {"priority", required_argument, 0, 'P'}, 389 {"quiet", no_argument, 0, 'q'}, 390 {"runtime", required_argument, 0, 'r'}, 391 {"stop", required_argument, 0, 's'}, 392 {"stop-total", required_argument, 0, 'S'}, 393 {"threshold", required_argument, 0, 'T'}, 394 {"trace", optional_argument, 0, 't'}, 395 {"trigger", required_argument, 0, '0'}, 396 {"filter", required_argument, 0, '1'}, 397 {"warm-up", required_argument, 0, '2'}, 398 {"trace-buffer-size", required_argument, 0, '3'}, 399 {0, 0, 0, 0} 400 }; 401 402 /* getopt_long stores the option index here. */ 403 int option_index = 0; 404 405 c = getopt_long(argc, argv, "a:c:C::d:De:hH:p:P:qr:s:S:t::T:0:1:2:3:", 406 long_options, &option_index); 407 408 /* Detect the end of the options. */ 409 if (c == -1) 410 break; 411 412 switch (c) { 413 case 'a': 414 /* set sample stop to auto_thresh */ 415 params->stop_us = get_llong_from_str(optarg); 416 417 /* set sample threshold to 1 */ 418 params->threshold = 1; 419 420 /* set trace */ 421 params->trace_output = "osnoise_trace.txt"; 422 423 break; 424 case 'c': 425 retval = parse_cpu_set(optarg, ¶ms->monitored_cpus); 426 if (retval) 427 osnoise_top_usage(params, "\nInvalid -c cpu list\n"); 428 params->cpus = optarg; 429 break; 430 case 'C': 431 params->cgroup = 1; 432 if (!optarg) { 433 /* will inherit this cgroup */ 434 params->cgroup_name = NULL; 435 } else if (*optarg == '=') { 436 /* skip the = */ 437 params->cgroup_name = ++optarg; 438 } 439 break; 440 case 'D': 441 config_debug = 1; 442 break; 443 case 'd': 444 params->duration = parse_seconds_duration(optarg); 445 if (!params->duration) 446 osnoise_top_usage(params, "Invalid -d duration\n"); 447 break; 448 case 'e': 449 tevent = trace_event_alloc(optarg); 450 if (!tevent) { 451 err_msg("Error alloc trace event"); 452 exit(EXIT_FAILURE); 453 } 454 455 if (params->events) 456 tevent->next = params->events; 457 params->events = tevent; 458 459 break; 460 case 'h': 461 case '?': 462 osnoise_top_usage(params, NULL); 463 break; 464 case 'H': 465 params->hk_cpus = 1; 466 retval = parse_cpu_set(optarg, ¶ms->hk_cpu_set); 467 if (retval) { 468 err_msg("Error parsing house keeping CPUs\n"); 469 exit(EXIT_FAILURE); 470 } 471 break; 472 case 'p': 473 params->period = get_llong_from_str(optarg); 474 if (params->period > 10000000) 475 osnoise_top_usage(params, "Period longer than 10 s\n"); 476 break; 477 case 'P': 478 retval = parse_prio(optarg, ¶ms->sched_param); 479 if (retval == -1) 480 osnoise_top_usage(params, "Invalid -P priority"); 481 params->set_sched = 1; 482 break; 483 case 'q': 484 params->quiet = 1; 485 break; 486 case 'r': 487 params->runtime = get_llong_from_str(optarg); 488 if (params->runtime < 100) 489 osnoise_top_usage(params, "Runtime shorter than 100 us\n"); 490 break; 491 case 's': 492 params->stop_us = get_llong_from_str(optarg); 493 break; 494 case 'S': 495 params->stop_total_us = get_llong_from_str(optarg); 496 break; 497 case 't': 498 if (optarg) { 499 if (optarg[0] == '=') 500 params->trace_output = &optarg[1]; 501 else 502 params->trace_output = &optarg[0]; 503 } else if (optind < argc && argv[optind][0] != '-') 504 params->trace_output = argv[optind]; 505 else 506 params->trace_output = "osnoise_trace.txt"; 507 break; 508 case 'T': 509 params->threshold = get_llong_from_str(optarg); 510 break; 511 case '0': /* trigger */ 512 if (params->events) { 513 retval = trace_event_add_trigger(params->events, optarg); 514 if (retval) { 515 err_msg("Error adding trigger %s\n", optarg); 516 exit(EXIT_FAILURE); 517 } 518 } else { 519 osnoise_top_usage(params, "--trigger requires a previous -e\n"); 520 } 521 break; 522 case '1': /* filter */ 523 if (params->events) { 524 retval = trace_event_add_filter(params->events, optarg); 525 if (retval) { 526 err_msg("Error adding filter %s\n", optarg); 527 exit(EXIT_FAILURE); 528 } 529 } else { 530 osnoise_top_usage(params, "--filter requires a previous -e\n"); 531 } 532 break; 533 case '2': 534 params->warmup = get_llong_from_str(optarg); 535 break; 536 case '3': 537 params->buffer_size = get_llong_from_str(optarg); 538 break; 539 default: 540 osnoise_top_usage(params, "Invalid option"); 541 } 542 } 543 544 if (geteuid()) { 545 err_msg("osnoise needs root permission\n"); 546 exit(EXIT_FAILURE); 547 } 548 549 return params; 550 } 551 552 /* 553 * osnoise_top_apply_config - apply the top configs to the initialized tool 554 */ 555 static int 556 osnoise_top_apply_config(struct osnoise_tool *tool, struct osnoise_top_params *params) 557 { 558 int retval; 559 560 if (!params->sleep_time) 561 params->sleep_time = 1; 562 563 if (params->cpus) { 564 retval = osnoise_set_cpus(tool->context, params->cpus); 565 if (retval) { 566 err_msg("Failed to apply CPUs config\n"); 567 goto out_err; 568 } 569 } 570 571 if (params->runtime || params->period) { 572 retval = osnoise_set_runtime_period(tool->context, 573 params->runtime, 574 params->period); 575 if (retval) { 576 err_msg("Failed to set runtime and/or period\n"); 577 goto out_err; 578 } 579 } 580 581 if (params->stop_us) { 582 retval = osnoise_set_stop_us(tool->context, params->stop_us); 583 if (retval) { 584 err_msg("Failed to set stop us\n"); 585 goto out_err; 586 } 587 } 588 589 if (params->stop_total_us) { 590 retval = osnoise_set_stop_total_us(tool->context, params->stop_total_us); 591 if (retval) { 592 err_msg("Failed to set stop total us\n"); 593 goto out_err; 594 } 595 } 596 597 if (params->threshold) { 598 retval = osnoise_set_tracing_thresh(tool->context, params->threshold); 599 if (retval) { 600 err_msg("Failed to set tracing_thresh\n"); 601 goto out_err; 602 } 603 } 604 605 if (params->mode == MODE_HWNOISE) { 606 retval = osnoise_set_irq_disable(tool->context, 1); 607 if (retval) { 608 err_msg("Failed to set OSNOISE_IRQ_DISABLE option\n"); 609 goto out_err; 610 } 611 } 612 613 if (params->hk_cpus) { 614 retval = sched_setaffinity(getpid(), sizeof(params->hk_cpu_set), 615 ¶ms->hk_cpu_set); 616 if (retval == -1) { 617 err_msg("Failed to set rtla to the house keeping CPUs\n"); 618 goto out_err; 619 } 620 } else if (params->cpus) { 621 /* 622 * Even if the user do not set a house-keeping CPU, try to 623 * move rtla to a CPU set different to the one where the user 624 * set the workload to run. 625 * 626 * No need to check results as this is an automatic attempt. 627 */ 628 auto_house_keeping(¶ms->monitored_cpus); 629 } 630 631 if (isatty(STDOUT_FILENO) && !params->quiet) 632 params->pretty_output = 1; 633 634 return 0; 635 636 out_err: 637 return -1; 638 } 639 640 /* 641 * osnoise_init_top - initialize a osnoise top tool with parameters 642 */ 643 struct osnoise_tool *osnoise_init_top(struct osnoise_top_params *params) 644 { 645 struct osnoise_tool *tool; 646 int nr_cpus; 647 648 nr_cpus = sysconf(_SC_NPROCESSORS_CONF); 649 650 tool = osnoise_init_tool("osnoise_top"); 651 if (!tool) 652 return NULL; 653 654 tool->data = osnoise_alloc_top(nr_cpus); 655 if (!tool->data) { 656 osnoise_destroy_tool(tool); 657 return NULL; 658 } 659 660 tool->params = params; 661 662 tep_register_event_handler(tool->trace.tep, -1, "ftrace", "osnoise", 663 osnoise_top_handler, NULL); 664 665 return tool; 666 } 667 668 static int stop_tracing; 669 static void stop_top(int sig) 670 { 671 stop_tracing = 1; 672 } 673 674 /* 675 * osnoise_top_set_signals - handles the signal to stop the tool 676 */ 677 static void osnoise_top_set_signals(struct osnoise_top_params *params) 678 { 679 signal(SIGINT, stop_top); 680 if (params->duration) { 681 signal(SIGALRM, stop_top); 682 alarm(params->duration); 683 } 684 } 685 686 int osnoise_top_main(int argc, char **argv) 687 { 688 struct osnoise_top_params *params; 689 struct osnoise_tool *record = NULL; 690 struct osnoise_tool *tool = NULL; 691 struct trace_instance *trace; 692 int return_value = 1; 693 int retval; 694 695 params = osnoise_top_parse_args(argc, argv); 696 if (!params) 697 exit(1); 698 699 tool = osnoise_init_top(params); 700 if (!tool) { 701 err_msg("Could not init osnoise top\n"); 702 goto out_exit; 703 } 704 705 retval = osnoise_top_apply_config(tool, params); 706 if (retval) { 707 err_msg("Could not apply config\n"); 708 goto out_free; 709 } 710 711 trace = &tool->trace; 712 713 retval = enable_osnoise(trace); 714 if (retval) { 715 err_msg("Failed to enable osnoise tracer\n"); 716 goto out_free; 717 } 718 719 if (params->set_sched) { 720 retval = set_comm_sched_attr("osnoise/", ¶ms->sched_param); 721 if (retval) { 722 err_msg("Failed to set sched parameters\n"); 723 goto out_free; 724 } 725 } 726 727 if (params->cgroup) { 728 retval = set_comm_cgroup("osnoise/", params->cgroup_name); 729 if (!retval) { 730 err_msg("Failed to move threads to cgroup\n"); 731 goto out_free; 732 } 733 } 734 735 if (params->trace_output) { 736 record = osnoise_init_trace_tool("osnoise"); 737 if (!record) { 738 err_msg("Failed to enable the trace instance\n"); 739 goto out_free; 740 } 741 742 if (params->events) { 743 retval = trace_events_enable(&record->trace, params->events); 744 if (retval) 745 goto out_top; 746 } 747 748 if (params->buffer_size > 0) { 749 retval = trace_set_buffer_size(&record->trace, params->buffer_size); 750 if (retval) 751 goto out_top; 752 } 753 } 754 755 /* 756 * Start the tracer here, after having set all instances. 757 * 758 * Let the trace instance start first for the case of hitting a stop 759 * tracing while enabling other instances. The trace instance is the 760 * one with most valuable information. 761 */ 762 if (params->trace_output) 763 trace_instance_start(&record->trace); 764 trace_instance_start(trace); 765 766 if (params->warmup > 0) { 767 debug_msg("Warming up for %d seconds\n", params->warmup); 768 sleep(params->warmup); 769 if (stop_tracing) 770 goto out_top; 771 772 /* 773 * Clean up the buffer. The osnoise workload do not run 774 * with tracing off to avoid creating a performance penalty 775 * when not needed. 776 */ 777 retval = tracefs_instance_file_write(trace->inst, "trace", ""); 778 if (retval < 0) { 779 debug_msg("Error cleaning up the buffer"); 780 goto out_top; 781 } 782 783 } 784 785 tool->start_time = time(NULL); 786 osnoise_top_set_signals(params); 787 788 while (!stop_tracing) { 789 sleep(params->sleep_time); 790 791 retval = tracefs_iterate_raw_events(trace->tep, 792 trace->inst, 793 NULL, 794 0, 795 collect_registered_events, 796 trace); 797 if (retval < 0) { 798 err_msg("Error iterating on events\n"); 799 goto out_top; 800 } 801 802 if (!params->quiet) 803 osnoise_print_stats(params, tool); 804 805 if (osnoise_trace_is_off(tool, record)) 806 break; 807 808 } 809 810 osnoise_print_stats(params, tool); 811 812 return_value = 0; 813 814 if (osnoise_trace_is_off(tool, record)) { 815 printf("osnoise hit stop tracing\n"); 816 if (params->trace_output) { 817 printf(" Saving trace to %s\n", params->trace_output); 818 save_trace_to_file(record->trace.inst, params->trace_output); 819 } 820 } 821 822 out_top: 823 trace_events_destroy(&record->trace, params->events); 824 params->events = NULL; 825 out_free: 826 osnoise_free_top(tool->data); 827 osnoise_destroy_tool(record); 828 osnoise_destroy_tool(tool); 829 free(params); 830 out_exit: 831 exit(return_value); 832 } 833