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 } 284 285 /* 286 * osnoise_top_usage - prints osnoise top usage message 287 */ 288 static void osnoise_top_usage(struct osnoise_top_params *params, char *usage) 289 { 290 int i; 291 292 static const char * const msg[] = { 293 " [-h] [-q] [-D] [-d s] [-a us] [-p us] [-r us] [-s us] [-S us] \\", 294 " [-T us] [-t[file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] \\", 295 " [-c cpu-list] [-H cpu-list] [-P priority] [-C[=cgroup_name]] [--warm-up s]", 296 "", 297 " -h/--help: print this menu", 298 " -a/--auto: set automatic trace mode, stopping the session if argument in us sample is hit", 299 " -p/--period us: osnoise period in us", 300 " -r/--runtime us: osnoise runtime in us", 301 " -s/--stop us: stop trace if a single sample is higher than the argument in us", 302 " -S/--stop-total us: stop trace if the total sample is higher than the argument in us", 303 " -T/--threshold us: the minimum delta to be considered a noise", 304 " -c/--cpus cpu-list: list of cpus to run osnoise threads", 305 " -H/--house-keeping cpus: run rtla control threads only on the given cpus", 306 " -C/--cgroup[=cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited", 307 " -d/--duration time[s|m|h|d]: duration of the session", 308 " -D/--debug: print debug info", 309 " -t/--trace[file]: save the stopped trace to [file|osnoise_trace.txt]", 310 " -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed", 311 " --filter <filter>: enable a trace event filter to the previous -e event", 312 " --trigger <trigger>: enable a trace event trigger to the previous -e event", 313 " -q/--quiet print only a summary at the end", 314 " -P/--priority o:prio|r:prio|f:prio|d:runtime:period : set scheduling parameters", 315 " o:prio - use SCHED_OTHER with prio", 316 " r:prio - use SCHED_RR with prio", 317 " f:prio - use SCHED_FIFO with prio", 318 " d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period", 319 " in nanoseconds", 320 " --warm-up s: let the workload run for s seconds before collecting data", 321 " --trace-buffer-size kB: set the per-cpu trace buffer size in kB", 322 NULL, 323 }; 324 325 if (usage) 326 fprintf(stderr, "%s\n", usage); 327 328 if (params->mode == MODE_OSNOISE) { 329 fprintf(stderr, 330 "rtla osnoise top: a per-cpu summary of the OS noise (version %s)\n", 331 VERSION); 332 333 fprintf(stderr, " usage: rtla osnoise [top]"); 334 } 335 336 if (params->mode == MODE_HWNOISE) { 337 fprintf(stderr, 338 "rtla hwnoise: a summary of hardware-related noise (version %s)\n", 339 VERSION); 340 341 fprintf(stderr, " usage: rtla hwnoise"); 342 } 343 344 for (i = 0; msg[i]; i++) 345 fprintf(stderr, "%s\n", msg[i]); 346 347 if (usage) 348 exit(EXIT_FAILURE); 349 350 exit(EXIT_SUCCESS); 351 } 352 353 /* 354 * osnoise_top_parse_args - allocs, parse and fill the cmd line parameters 355 */ 356 struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv) 357 { 358 struct osnoise_top_params *params; 359 struct trace_events *tevent; 360 int retval; 361 int c; 362 363 params = calloc(1, sizeof(*params)); 364 if (!params) 365 exit(1); 366 367 if (strcmp(argv[0], "hwnoise") == 0) { 368 params->mode = MODE_HWNOISE; 369 /* 370 * Reduce CPU usage for 75% to avoid killing the system. 371 */ 372 params->runtime = 750000; 373 params->period = 1000000; 374 } 375 376 while (1) { 377 static struct option long_options[] = { 378 {"auto", required_argument, 0, 'a'}, 379 {"cpus", required_argument, 0, 'c'}, 380 {"cgroup", optional_argument, 0, 'C'}, 381 {"debug", no_argument, 0, 'D'}, 382 {"duration", required_argument, 0, 'd'}, 383 {"event", required_argument, 0, 'e'}, 384 {"house-keeping", required_argument, 0, 'H'}, 385 {"help", no_argument, 0, 'h'}, 386 {"period", required_argument, 0, 'p'}, 387 {"priority", required_argument, 0, 'P'}, 388 {"quiet", no_argument, 0, 'q'}, 389 {"runtime", required_argument, 0, 'r'}, 390 {"stop", required_argument, 0, 's'}, 391 {"stop-total", required_argument, 0, 'S'}, 392 {"threshold", required_argument, 0, 'T'}, 393 {"trace", optional_argument, 0, 't'}, 394 {"trigger", required_argument, 0, '0'}, 395 {"filter", required_argument, 0, '1'}, 396 {"warm-up", required_argument, 0, '2'}, 397 {"trace-buffer-size", required_argument, 0, '3'}, 398 {0, 0, 0, 0} 399 }; 400 401 /* getopt_long stores the option index here. */ 402 int option_index = 0; 403 404 c = getopt_long(argc, argv, "a:c:C::d:De:hH:p:P:qr:s:S:t::T:0:1:2:3:", 405 long_options, &option_index); 406 407 /* Detect the end of the options. */ 408 if (c == -1) 409 break; 410 411 switch (c) { 412 case 'a': 413 /* set sample stop to auto_thresh */ 414 params->stop_us = get_llong_from_str(optarg); 415 416 /* set sample threshold to 1 */ 417 params->threshold = 1; 418 419 /* set trace */ 420 params->trace_output = "osnoise_trace.txt"; 421 422 break; 423 case 'c': 424 retval = parse_cpu_set(optarg, ¶ms->monitored_cpus); 425 if (retval) 426 osnoise_top_usage(params, "\nInvalid -c cpu list\n"); 427 params->cpus = optarg; 428 break; 429 case 'C': 430 params->cgroup = 1; 431 if (!optarg) { 432 /* will inherit this cgroup */ 433 params->cgroup_name = NULL; 434 } else if (*optarg == '=') { 435 /* skip the = */ 436 params->cgroup_name = ++optarg; 437 } 438 break; 439 case 'D': 440 config_debug = 1; 441 break; 442 case 'd': 443 params->duration = parse_seconds_duration(optarg); 444 if (!params->duration) 445 osnoise_top_usage(params, "Invalid -D duration\n"); 446 break; 447 case 'e': 448 tevent = trace_event_alloc(optarg); 449 if (!tevent) { 450 err_msg("Error alloc trace event"); 451 exit(EXIT_FAILURE); 452 } 453 454 if (params->events) 455 tevent->next = params->events; 456 params->events = tevent; 457 458 break; 459 case 'h': 460 case '?': 461 osnoise_top_usage(params, NULL); 462 break; 463 case 'H': 464 params->hk_cpus = 1; 465 retval = parse_cpu_set(optarg, ¶ms->hk_cpu_set); 466 if (retval) { 467 err_msg("Error parsing house keeping CPUs\n"); 468 exit(EXIT_FAILURE); 469 } 470 break; 471 case 'p': 472 params->period = get_llong_from_str(optarg); 473 if (params->period > 10000000) 474 osnoise_top_usage(params, "Period longer than 10 s\n"); 475 break; 476 case 'P': 477 retval = parse_prio(optarg, ¶ms->sched_param); 478 if (retval == -1) 479 osnoise_top_usage(params, "Invalid -P priority"); 480 params->set_sched = 1; 481 break; 482 case 'q': 483 params->quiet = 1; 484 break; 485 case 'r': 486 params->runtime = get_llong_from_str(optarg); 487 if (params->runtime < 100) 488 osnoise_top_usage(params, "Runtime shorter than 100 us\n"); 489 break; 490 case 's': 491 params->stop_us = get_llong_from_str(optarg); 492 break; 493 case 'S': 494 params->stop_total_us = get_llong_from_str(optarg); 495 break; 496 case 't': 497 if (optarg) { 498 if (optarg[0] == '=') 499 params->trace_output = &optarg[1]; 500 else 501 params->trace_output = &optarg[0]; 502 } else if (optind < argc && argv[optind][0] != '-') 503 params->trace_output = argv[optind]; 504 else 505 params->trace_output = "osnoise_trace.txt"; 506 break; 507 case 'T': 508 params->threshold = get_llong_from_str(optarg); 509 break; 510 case '0': /* trigger */ 511 if (params->events) { 512 retval = trace_event_add_trigger(params->events, optarg); 513 if (retval) { 514 err_msg("Error adding trigger %s\n", optarg); 515 exit(EXIT_FAILURE); 516 } 517 } else { 518 osnoise_top_usage(params, "--trigger requires a previous -e\n"); 519 } 520 break; 521 case '1': /* filter */ 522 if (params->events) { 523 retval = trace_event_add_filter(params->events, optarg); 524 if (retval) { 525 err_msg("Error adding filter %s\n", optarg); 526 exit(EXIT_FAILURE); 527 } 528 } else { 529 osnoise_top_usage(params, "--filter requires a previous -e\n"); 530 } 531 break; 532 case '2': 533 params->warmup = get_llong_from_str(optarg); 534 break; 535 case '3': 536 params->buffer_size = get_llong_from_str(optarg); 537 break; 538 default: 539 osnoise_top_usage(params, "Invalid option"); 540 } 541 } 542 543 if (geteuid()) { 544 err_msg("osnoise needs root permission\n"); 545 exit(EXIT_FAILURE); 546 } 547 548 return params; 549 } 550 551 /* 552 * osnoise_top_apply_config - apply the top configs to the initialized tool 553 */ 554 static int 555 osnoise_top_apply_config(struct osnoise_tool *tool, struct osnoise_top_params *params) 556 { 557 int retval; 558 559 if (!params->sleep_time) 560 params->sleep_time = 1; 561 562 if (params->cpus) { 563 retval = osnoise_set_cpus(tool->context, params->cpus); 564 if (retval) { 565 err_msg("Failed to apply CPUs config\n"); 566 goto out_err; 567 } 568 } 569 570 if (params->runtime || params->period) { 571 retval = osnoise_set_runtime_period(tool->context, 572 params->runtime, 573 params->period); 574 if (retval) { 575 err_msg("Failed to set runtime and/or period\n"); 576 goto out_err; 577 } 578 } 579 580 if (params->stop_us) { 581 retval = osnoise_set_stop_us(tool->context, params->stop_us); 582 if (retval) { 583 err_msg("Failed to set stop us\n"); 584 goto out_err; 585 } 586 } 587 588 if (params->stop_total_us) { 589 retval = osnoise_set_stop_total_us(tool->context, params->stop_total_us); 590 if (retval) { 591 err_msg("Failed to set stop total us\n"); 592 goto out_err; 593 } 594 } 595 596 if (params->threshold) { 597 retval = osnoise_set_tracing_thresh(tool->context, params->threshold); 598 if (retval) { 599 err_msg("Failed to set tracing_thresh\n"); 600 goto out_err; 601 } 602 } 603 604 if (params->mode == MODE_HWNOISE) { 605 retval = osnoise_set_irq_disable(tool->context, 1); 606 if (retval) { 607 err_msg("Failed to set OSNOISE_IRQ_DISABLE option\n"); 608 goto out_err; 609 } 610 } 611 612 if (params->hk_cpus) { 613 retval = sched_setaffinity(getpid(), sizeof(params->hk_cpu_set), 614 ¶ms->hk_cpu_set); 615 if (retval == -1) { 616 err_msg("Failed to set rtla to the house keeping CPUs\n"); 617 goto out_err; 618 } 619 } else if (params->cpus) { 620 /* 621 * Even if the user do not set a house-keeping CPU, try to 622 * move rtla to a CPU set different to the one where the user 623 * set the workload to run. 624 * 625 * No need to check results as this is an automatic attempt. 626 */ 627 auto_house_keeping(¶ms->monitored_cpus); 628 } 629 630 if (isatty(1) && !params->quiet) 631 params->pretty_output = 1; 632 633 return 0; 634 635 out_err: 636 return -1; 637 } 638 639 /* 640 * osnoise_init_top - initialize a osnoise top tool with parameters 641 */ 642 struct osnoise_tool *osnoise_init_top(struct osnoise_top_params *params) 643 { 644 struct osnoise_tool *tool; 645 int nr_cpus; 646 647 nr_cpus = sysconf(_SC_NPROCESSORS_CONF); 648 649 tool = osnoise_init_tool("osnoise_top"); 650 if (!tool) 651 return NULL; 652 653 tool->data = osnoise_alloc_top(nr_cpus); 654 if (!tool->data) 655 goto out_err; 656 657 tool->params = params; 658 659 tep_register_event_handler(tool->trace.tep, -1, "ftrace", "osnoise", 660 osnoise_top_handler, NULL); 661 662 return tool; 663 664 out_err: 665 osnoise_free_top(tool->data); 666 osnoise_destroy_tool(tool); 667 return NULL; 668 } 669 670 static int stop_tracing; 671 static void stop_top(int sig) 672 { 673 stop_tracing = 1; 674 } 675 676 /* 677 * osnoise_top_set_signals - handles the signal to stop the tool 678 */ 679 static void osnoise_top_set_signals(struct osnoise_top_params *params) 680 { 681 signal(SIGINT, stop_top); 682 if (params->duration) { 683 signal(SIGALRM, stop_top); 684 alarm(params->duration); 685 } 686 } 687 688 int osnoise_top_main(int argc, char **argv) 689 { 690 struct osnoise_top_params *params; 691 struct osnoise_tool *record = NULL; 692 struct osnoise_tool *tool = NULL; 693 struct trace_instance *trace; 694 int return_value = 1; 695 int retval; 696 697 params = osnoise_top_parse_args(argc, argv); 698 if (!params) 699 exit(1); 700 701 tool = osnoise_init_top(params); 702 if (!tool) { 703 err_msg("Could not init osnoise top\n"); 704 goto out_exit; 705 } 706 707 retval = osnoise_top_apply_config(tool, params); 708 if (retval) { 709 err_msg("Could not apply config\n"); 710 goto out_free; 711 } 712 713 trace = &tool->trace; 714 715 retval = enable_osnoise(trace); 716 if (retval) { 717 err_msg("Failed to enable osnoise tracer\n"); 718 goto out_free; 719 } 720 721 if (params->set_sched) { 722 retval = set_comm_sched_attr("osnoise/", ¶ms->sched_param); 723 if (retval) { 724 err_msg("Failed to set sched parameters\n"); 725 goto out_free; 726 } 727 } 728 729 if (params->cgroup) { 730 retval = set_comm_cgroup("osnoise/", params->cgroup_name); 731 if (!retval) { 732 err_msg("Failed to move threads to cgroup\n"); 733 goto out_free; 734 } 735 } 736 737 if (params->trace_output) { 738 record = osnoise_init_trace_tool("osnoise"); 739 if (!record) { 740 err_msg("Failed to enable the trace instance\n"); 741 goto out_free; 742 } 743 744 if (params->events) { 745 retval = trace_events_enable(&record->trace, params->events); 746 if (retval) 747 goto out_top; 748 } 749 750 if (params->buffer_size > 0) { 751 retval = trace_set_buffer_size(&record->trace, params->buffer_size); 752 if (retval) 753 goto out_top; 754 } 755 } 756 757 /* 758 * Start the tracer here, after having set all instances. 759 * 760 * Let the trace instance start first for the case of hitting a stop 761 * tracing while enabling other instances. The trace instance is the 762 * one with most valuable information. 763 */ 764 if (params->trace_output) 765 trace_instance_start(&record->trace); 766 trace_instance_start(trace); 767 768 if (params->warmup > 0) { 769 debug_msg("Warming up for %d seconds\n", params->warmup); 770 sleep(params->warmup); 771 if (stop_tracing) 772 goto out_top; 773 774 /* 775 * Clean up the buffer. The osnoise workload do not run 776 * with tracing off to avoid creating a performance penalty 777 * when not needed. 778 */ 779 retval = tracefs_instance_file_write(trace->inst, "trace", ""); 780 if (retval < 0) { 781 debug_msg("Error cleaning up the buffer"); 782 goto out_top; 783 } 784 785 } 786 787 tool->start_time = time(NULL); 788 osnoise_top_set_signals(params); 789 790 while (!stop_tracing) { 791 sleep(params->sleep_time); 792 793 retval = tracefs_iterate_raw_events(trace->tep, 794 trace->inst, 795 NULL, 796 0, 797 collect_registered_events, 798 trace); 799 if (retval < 0) { 800 err_msg("Error iterating on events\n"); 801 goto out_top; 802 } 803 804 if (!params->quiet) 805 osnoise_print_stats(params, tool); 806 807 if (trace_is_off(&tool->trace, &record->trace)) 808 break; 809 810 } 811 812 osnoise_print_stats(params, tool); 813 814 return_value = 0; 815 816 if (trace_is_off(&tool->trace, &record->trace)) { 817 printf("osnoise hit stop tracing\n"); 818 if (params->trace_output) { 819 printf(" Saving trace to %s\n", params->trace_output); 820 save_trace_to_file(record->trace.inst, params->trace_output); 821 } 822 } 823 824 out_top: 825 trace_events_destroy(&record->trace, params->events); 826 params->events = NULL; 827 out_free: 828 osnoise_free_top(tool->data); 829 osnoise_destroy_tool(record); 830 osnoise_destroy_tool(tool); 831 free(params); 832 out_exit: 833 exit(return_value); 834 } 835