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 /* skip = */ 491 params->trace_output = &optarg[1]; 492 else 493 params->trace_output = "osnoise_trace.txt"; 494 break; 495 case 'T': 496 params->threshold = get_llong_from_str(optarg); 497 break; 498 case '0': /* trigger */ 499 if (params->events) { 500 retval = trace_event_add_trigger(params->events, optarg); 501 if (retval) { 502 err_msg("Error adding trigger %s\n", optarg); 503 exit(EXIT_FAILURE); 504 } 505 } else { 506 osnoise_top_usage(params, "--trigger requires a previous -e\n"); 507 } 508 break; 509 case '1': /* filter */ 510 if (params->events) { 511 retval = trace_event_add_filter(params->events, optarg); 512 if (retval) { 513 err_msg("Error adding filter %s\n", optarg); 514 exit(EXIT_FAILURE); 515 } 516 } else { 517 osnoise_top_usage(params, "--filter requires a previous -e\n"); 518 } 519 break; 520 case '2': 521 params->warmup = get_llong_from_str(optarg); 522 break; 523 case '3': 524 params->buffer_size = get_llong_from_str(optarg); 525 break; 526 default: 527 osnoise_top_usage(params, "Invalid option"); 528 } 529 } 530 531 if (geteuid()) { 532 err_msg("osnoise needs root permission\n"); 533 exit(EXIT_FAILURE); 534 } 535 536 return params; 537 } 538 539 /* 540 * osnoise_top_apply_config - apply the top configs to the initialized tool 541 */ 542 static int 543 osnoise_top_apply_config(struct osnoise_tool *tool, struct osnoise_top_params *params) 544 { 545 int retval; 546 547 if (!params->sleep_time) 548 params->sleep_time = 1; 549 550 if (params->cpus) { 551 retval = osnoise_set_cpus(tool->context, params->cpus); 552 if (retval) { 553 err_msg("Failed to apply CPUs config\n"); 554 goto out_err; 555 } 556 } 557 558 if (params->runtime || params->period) { 559 retval = osnoise_set_runtime_period(tool->context, 560 params->runtime, 561 params->period); 562 if (retval) { 563 err_msg("Failed to set runtime and/or period\n"); 564 goto out_err; 565 } 566 } 567 568 if (params->stop_us) { 569 retval = osnoise_set_stop_us(tool->context, params->stop_us); 570 if (retval) { 571 err_msg("Failed to set stop us\n"); 572 goto out_err; 573 } 574 } 575 576 if (params->stop_total_us) { 577 retval = osnoise_set_stop_total_us(tool->context, params->stop_total_us); 578 if (retval) { 579 err_msg("Failed to set stop total us\n"); 580 goto out_err; 581 } 582 } 583 584 if (params->threshold) { 585 retval = osnoise_set_tracing_thresh(tool->context, params->threshold); 586 if (retval) { 587 err_msg("Failed to set tracing_thresh\n"); 588 goto out_err; 589 } 590 } 591 592 if (params->mode == MODE_HWNOISE) { 593 retval = osnoise_set_irq_disable(tool->context, 1); 594 if (retval) { 595 err_msg("Failed to set OSNOISE_IRQ_DISABLE option\n"); 596 goto out_err; 597 } 598 } 599 600 if (params->hk_cpus) { 601 retval = sched_setaffinity(getpid(), sizeof(params->hk_cpu_set), 602 ¶ms->hk_cpu_set); 603 if (retval == -1) { 604 err_msg("Failed to set rtla to the house keeping CPUs\n"); 605 goto out_err; 606 } 607 } else if (params->cpus) { 608 /* 609 * Even if the user do not set a house-keeping CPU, try to 610 * move rtla to a CPU set different to the one where the user 611 * set the workload to run. 612 * 613 * No need to check results as this is an automatic attempt. 614 */ 615 auto_house_keeping(¶ms->monitored_cpus); 616 } 617 618 return 0; 619 620 out_err: 621 return -1; 622 } 623 624 /* 625 * osnoise_init_top - initialize a osnoise top tool with parameters 626 */ 627 struct osnoise_tool *osnoise_init_top(struct osnoise_top_params *params) 628 { 629 struct osnoise_tool *tool; 630 int nr_cpus; 631 632 nr_cpus = sysconf(_SC_NPROCESSORS_CONF); 633 634 tool = osnoise_init_tool("osnoise_top"); 635 if (!tool) 636 return NULL; 637 638 tool->data = osnoise_alloc_top(nr_cpus); 639 if (!tool->data) 640 goto out_err; 641 642 tool->params = params; 643 644 tep_register_event_handler(tool->trace.tep, -1, "ftrace", "osnoise", 645 osnoise_top_handler, NULL); 646 647 return tool; 648 649 out_err: 650 osnoise_free_top(tool->data); 651 osnoise_destroy_tool(tool); 652 return NULL; 653 } 654 655 static int stop_tracing; 656 static void stop_top(int sig) 657 { 658 stop_tracing = 1; 659 } 660 661 /* 662 * osnoise_top_set_signals - handles the signal to stop the tool 663 */ 664 static void osnoise_top_set_signals(struct osnoise_top_params *params) 665 { 666 signal(SIGINT, stop_top); 667 if (params->duration) { 668 signal(SIGALRM, stop_top); 669 alarm(params->duration); 670 } 671 } 672 673 int osnoise_top_main(int argc, char **argv) 674 { 675 struct osnoise_top_params *params; 676 struct osnoise_tool *record = NULL; 677 struct osnoise_tool *tool = NULL; 678 struct trace_instance *trace; 679 int return_value = 1; 680 int retval; 681 682 params = osnoise_top_parse_args(argc, argv); 683 if (!params) 684 exit(1); 685 686 tool = osnoise_init_top(params); 687 if (!tool) { 688 err_msg("Could not init osnoise top\n"); 689 goto out_exit; 690 } 691 692 retval = osnoise_top_apply_config(tool, params); 693 if (retval) { 694 err_msg("Could not apply config\n"); 695 goto out_free; 696 } 697 698 trace = &tool->trace; 699 700 retval = enable_osnoise(trace); 701 if (retval) { 702 err_msg("Failed to enable osnoise tracer\n"); 703 goto out_free; 704 } 705 706 if (params->set_sched) { 707 retval = set_comm_sched_attr("osnoise/", ¶ms->sched_param); 708 if (retval) { 709 err_msg("Failed to set sched parameters\n"); 710 goto out_free; 711 } 712 } 713 714 if (params->cgroup) { 715 retval = set_comm_cgroup("osnoise/", params->cgroup_name); 716 if (!retval) { 717 err_msg("Failed to move threads to cgroup\n"); 718 goto out_free; 719 } 720 } 721 722 if (params->trace_output) { 723 record = osnoise_init_trace_tool("osnoise"); 724 if (!record) { 725 err_msg("Failed to enable the trace instance\n"); 726 goto out_free; 727 } 728 729 if (params->events) { 730 retval = trace_events_enable(&record->trace, params->events); 731 if (retval) 732 goto out_top; 733 } 734 735 if (params->buffer_size > 0) { 736 retval = trace_set_buffer_size(&record->trace, params->buffer_size); 737 if (retval) 738 goto out_top; 739 } 740 } 741 742 /* 743 * Start the tracer here, after having set all instances. 744 * 745 * Let the trace instance start first for the case of hitting a stop 746 * tracing while enabling other instances. The trace instance is the 747 * one with most valuable information. 748 */ 749 if (params->trace_output) 750 trace_instance_start(&record->trace); 751 trace_instance_start(trace); 752 753 if (params->warmup > 0) { 754 debug_msg("Warming up for %d seconds\n", params->warmup); 755 sleep(params->warmup); 756 if (stop_tracing) 757 goto out_top; 758 759 /* 760 * Clean up the buffer. The osnoise workload do not run 761 * with tracing off to avoid creating a performance penalty 762 * when not needed. 763 */ 764 retval = tracefs_instance_file_write(trace->inst, "trace", ""); 765 if (retval < 0) { 766 debug_msg("Error cleaning up the buffer"); 767 goto out_top; 768 } 769 770 } 771 772 tool->start_time = time(NULL); 773 osnoise_top_set_signals(params); 774 775 while (!stop_tracing) { 776 sleep(params->sleep_time); 777 778 retval = tracefs_iterate_raw_events(trace->tep, 779 trace->inst, 780 NULL, 781 0, 782 collect_registered_events, 783 trace); 784 if (retval < 0) { 785 err_msg("Error iterating on events\n"); 786 goto out_top; 787 } 788 789 if (!params->quiet) 790 osnoise_print_stats(params, tool); 791 792 if (trace_is_off(&tool->trace, &record->trace)) 793 break; 794 795 } 796 797 osnoise_print_stats(params, tool); 798 799 return_value = 0; 800 801 if (trace_is_off(&tool->trace, &record->trace)) { 802 printf("osnoise hit stop tracing\n"); 803 if (params->trace_output) { 804 printf(" Saving trace to %s\n", params->trace_output); 805 save_trace_to_file(record->trace.inst, params->trace_output); 806 } 807 } 808 809 out_top: 810 trace_events_destroy(&record->trace, params->events); 811 params->events = NULL; 812 out_free: 813 osnoise_free_top(tool->data); 814 osnoise_destroy_tool(record); 815 osnoise_destroy_tool(tool); 816 free(params); 817 out_exit: 818 exit(return_value); 819 } 820