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