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 16 #include "osnoise.h" 17 18 struct osnoise_hist_cpu { 19 int *samples; 20 int count; 21 22 unsigned long long min_sample; 23 unsigned long long sum_sample; 24 unsigned long long max_sample; 25 26 }; 27 28 struct osnoise_hist_data { 29 struct tracefs_hist *trace_hist; 30 struct osnoise_hist_cpu *hist; 31 int entries; 32 int bucket_size; 33 int nr_cpus; 34 }; 35 36 /* 37 * osnoise_free_histogram - free runtime data 38 */ 39 static void 40 osnoise_free_histogram(struct osnoise_hist_data *data) 41 { 42 int cpu; 43 44 /* one histogram for IRQ and one for thread, per CPU */ 45 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 46 if (data->hist[cpu].samples) 47 free(data->hist[cpu].samples); 48 } 49 50 /* one set of histograms per CPU */ 51 if (data->hist) 52 free(data->hist); 53 54 free(data); 55 } 56 57 static void osnoise_free_hist_tool(struct osnoise_tool *tool) 58 { 59 osnoise_free_histogram(tool->data); 60 } 61 62 /* 63 * osnoise_alloc_histogram - alloc runtime data 64 */ 65 static struct osnoise_hist_data 66 *osnoise_alloc_histogram(int nr_cpus, int entries, int bucket_size) 67 { 68 struct osnoise_hist_data *data; 69 int cpu; 70 71 data = calloc(1, sizeof(*data)); 72 if (!data) 73 return NULL; 74 75 data->entries = entries; 76 data->bucket_size = bucket_size; 77 data->nr_cpus = nr_cpus; 78 79 data->hist = calloc(1, sizeof(*data->hist) * nr_cpus); 80 if (!data->hist) 81 goto cleanup; 82 83 for (cpu = 0; cpu < nr_cpus; cpu++) { 84 data->hist[cpu].samples = calloc(1, sizeof(*data->hist->samples) * (entries + 1)); 85 if (!data->hist[cpu].samples) 86 goto cleanup; 87 } 88 89 /* set the min to max */ 90 for (cpu = 0; cpu < nr_cpus; cpu++) 91 data->hist[cpu].min_sample = ~0; 92 93 return data; 94 95 cleanup: 96 osnoise_free_histogram(data); 97 return NULL; 98 } 99 100 static void osnoise_hist_update_multiple(struct osnoise_tool *tool, int cpu, 101 unsigned long long duration, int count) 102 { 103 struct osnoise_params *params = to_osnoise_params(tool->params); 104 struct osnoise_hist_data *data = tool->data; 105 unsigned long long total_duration; 106 int entries = data->entries; 107 int bucket; 108 int *hist; 109 110 if (params->common.output_divisor) 111 duration = duration / params->common.output_divisor; 112 113 bucket = duration / data->bucket_size; 114 115 total_duration = duration * count; 116 117 hist = data->hist[cpu].samples; 118 data->hist[cpu].count += count; 119 update_min(&data->hist[cpu].min_sample, &duration); 120 update_sum(&data->hist[cpu].sum_sample, &total_duration); 121 update_max(&data->hist[cpu].max_sample, &duration); 122 123 if (bucket < entries) 124 hist[bucket] += count; 125 else 126 hist[entries] += count; 127 } 128 129 /* 130 * osnoise_destroy_trace_hist - disable events used to collect histogram 131 */ 132 static void osnoise_destroy_trace_hist(struct osnoise_tool *tool) 133 { 134 struct osnoise_hist_data *data = tool->data; 135 136 tracefs_hist_pause(tool->trace.inst, data->trace_hist); 137 tracefs_hist_destroy(tool->trace.inst, data->trace_hist); 138 } 139 140 /* 141 * osnoise_init_trace_hist - enable events used to collect histogram 142 */ 143 static int osnoise_init_trace_hist(struct osnoise_tool *tool) 144 { 145 struct osnoise_params *params = to_osnoise_params(tool->params); 146 struct osnoise_hist_data *data = tool->data; 147 int bucket_size; 148 char buff[128]; 149 int retval = 0; 150 151 /* 152 * Set the size of the bucket. 153 */ 154 bucket_size = params->common.output_divisor * params->common.hist.bucket_size; 155 snprintf(buff, sizeof(buff), "duration.buckets=%d", bucket_size); 156 157 data->trace_hist = tracefs_hist_alloc(tool->trace.tep, "osnoise", "sample_threshold", 158 buff, TRACEFS_HIST_KEY_NORMAL); 159 if (!data->trace_hist) 160 return 1; 161 162 retval = tracefs_hist_add_key(data->trace_hist, "cpu", 0); 163 if (retval) 164 goto out_err; 165 166 retval = tracefs_hist_start(tool->trace.inst, data->trace_hist); 167 if (retval) 168 goto out_err; 169 170 return 0; 171 172 out_err: 173 osnoise_destroy_trace_hist(tool); 174 return 1; 175 } 176 177 /* 178 * osnoise_read_trace_hist - parse histogram file and file osnoise histogram 179 */ 180 static void osnoise_read_trace_hist(struct osnoise_tool *tool) 181 { 182 struct osnoise_hist_data *data = tool->data; 183 long long cpu, counter, duration; 184 char *content, *position; 185 186 tracefs_hist_pause(tool->trace.inst, data->trace_hist); 187 188 content = tracefs_event_file_read(tool->trace.inst, "osnoise", 189 "sample_threshold", 190 "hist", NULL); 191 if (!content) 192 return; 193 194 position = content; 195 while (true) { 196 position = strstr(position, "duration: ~"); 197 if (!position) 198 break; 199 position += strlen("duration: ~"); 200 duration = get_llong_from_str(position); 201 if (duration == -1) 202 err_msg("error reading duration from histogram\n"); 203 204 position = strstr(position, "cpu:"); 205 if (!position) 206 break; 207 position += strlen("cpu: "); 208 cpu = get_llong_from_str(position); 209 if (cpu == -1) 210 err_msg("error reading cpu from histogram\n"); 211 212 position = strstr(position, "hitcount:"); 213 if (!position) 214 break; 215 position += strlen("hitcount: "); 216 counter = get_llong_from_str(position); 217 if (counter == -1) 218 err_msg("error reading counter from histogram\n"); 219 220 osnoise_hist_update_multiple(tool, cpu, duration, counter); 221 } 222 free(content); 223 } 224 225 /* 226 * osnoise_hist_header - print the header of the tracer to the output 227 */ 228 static void osnoise_hist_header(struct osnoise_tool *tool) 229 { 230 struct osnoise_params *params = to_osnoise_params(tool->params); 231 struct osnoise_hist_data *data = tool->data; 232 struct trace_seq *s = tool->trace.seq; 233 char duration[26]; 234 int cpu; 235 236 if (params->common.hist.no_header) 237 return; 238 239 get_duration(tool->start_time, duration, sizeof(duration)); 240 trace_seq_printf(s, "# RTLA osnoise histogram\n"); 241 trace_seq_printf(s, "# Time unit is %s (%s)\n", 242 params->common.output_divisor == 1 ? "nanoseconds" : "microseconds", 243 params->common.output_divisor == 1 ? "ns" : "us"); 244 245 trace_seq_printf(s, "# Duration: %s\n", duration); 246 247 if (!params->common.hist.no_index) 248 trace_seq_printf(s, "Index"); 249 250 for_each_monitored_cpu(cpu, data->nr_cpus, ¶ms->common) { 251 252 if (!data->hist[cpu].count) 253 continue; 254 255 trace_seq_printf(s, " CPU-%03d", cpu); 256 } 257 trace_seq_printf(s, "\n"); 258 259 trace_seq_do_printf(s); 260 trace_seq_reset(s); 261 } 262 263 /* 264 * osnoise_print_summary - print the summary of the hist data to the output 265 */ 266 static void 267 osnoise_print_summary(struct osnoise_params *params, 268 struct trace_instance *trace, 269 struct osnoise_hist_data *data) 270 { 271 int cpu; 272 273 if (params->common.hist.no_summary) 274 return; 275 276 if (!params->common.hist.no_index) 277 trace_seq_printf(trace->seq, "count:"); 278 279 for_each_monitored_cpu(cpu, data->nr_cpus, ¶ms->common) { 280 281 if (!data->hist[cpu].count) 282 continue; 283 284 trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].count); 285 } 286 trace_seq_printf(trace->seq, "\n"); 287 288 if (!params->common.hist.no_index) 289 trace_seq_printf(trace->seq, "min: "); 290 291 for_each_monitored_cpu(cpu, data->nr_cpus, ¶ms->common) { 292 293 if (!data->hist[cpu].count) 294 continue; 295 296 trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].min_sample); 297 298 } 299 trace_seq_printf(trace->seq, "\n"); 300 301 if (!params->common.hist.no_index) 302 trace_seq_printf(trace->seq, "avg: "); 303 304 for_each_monitored_cpu(cpu, data->nr_cpus, ¶ms->common) { 305 306 if (!data->hist[cpu].count) 307 continue; 308 309 if (data->hist[cpu].count) 310 trace_seq_printf(trace->seq, "%9.2f ", 311 ((double) data->hist[cpu].sum_sample) / data->hist[cpu].count); 312 else 313 trace_seq_printf(trace->seq, " - "); 314 } 315 trace_seq_printf(trace->seq, "\n"); 316 317 if (!params->common.hist.no_index) 318 trace_seq_printf(trace->seq, "max: "); 319 320 for_each_monitored_cpu(cpu, data->nr_cpus, ¶ms->common) { 321 322 if (!data->hist[cpu].count) 323 continue; 324 325 trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].max_sample); 326 327 } 328 trace_seq_printf(trace->seq, "\n"); 329 trace_seq_do_printf(trace->seq); 330 trace_seq_reset(trace->seq); 331 } 332 333 /* 334 * osnoise_print_stats - print data for all CPUs 335 */ 336 static void 337 osnoise_print_stats(struct osnoise_tool *tool) 338 { 339 struct osnoise_params *params = to_osnoise_params(tool->params); 340 struct osnoise_hist_data *data = tool->data; 341 struct trace_instance *trace = &tool->trace; 342 int has_samples = 0; 343 int bucket, cpu; 344 int total; 345 346 osnoise_hist_header(tool); 347 348 for (bucket = 0; bucket < data->entries; bucket++) { 349 total = 0; 350 351 if (!params->common.hist.no_index) 352 trace_seq_printf(trace->seq, "%-6d", 353 bucket * data->bucket_size); 354 355 for_each_monitored_cpu(cpu, data->nr_cpus, ¶ms->common) { 356 357 if (!data->hist[cpu].count) 358 continue; 359 360 total += data->hist[cpu].samples[bucket]; 361 trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].samples[bucket]); 362 } 363 364 if (total == 0 && !params->common.hist.with_zeros) { 365 trace_seq_reset(trace->seq); 366 continue; 367 } 368 369 /* There are samples above the threshold */ 370 has_samples = 1; 371 trace_seq_printf(trace->seq, "\n"); 372 trace_seq_do_printf(trace->seq); 373 trace_seq_reset(trace->seq); 374 } 375 376 /* 377 * If no samples were recorded, skip calculations, print zeroed statistics 378 * and return. 379 */ 380 if (!has_samples) { 381 trace_seq_reset(trace->seq); 382 trace_seq_printf(trace->seq, "over: 0\ncount: 0\nmin: 0\navg: 0\nmax: 0\n"); 383 trace_seq_do_printf(trace->seq); 384 trace_seq_reset(trace->seq); 385 return; 386 } 387 388 if (!params->common.hist.no_index) 389 trace_seq_printf(trace->seq, "over: "); 390 391 for_each_monitored_cpu(cpu, data->nr_cpus, ¶ms->common) { 392 393 if (!data->hist[cpu].count) 394 continue; 395 396 trace_seq_printf(trace->seq, "%9d ", 397 data->hist[cpu].samples[data->entries]); 398 } 399 trace_seq_printf(trace->seq, "\n"); 400 trace_seq_do_printf(trace->seq); 401 trace_seq_reset(trace->seq); 402 403 osnoise_print_summary(params, trace, data); 404 osnoise_report_missed_events(tool); 405 } 406 407 /* 408 * osnoise_hist_usage - prints osnoise hist usage message 409 */ 410 static void osnoise_hist_usage(void) 411 { 412 int i; 413 414 static const char * const msg[] = { 415 "", 416 " usage: rtla osnoise hist [-h] [-D] [-d s] [-a us] [-p us] [-r us] [-s us] [-S us] \\", 417 " [-T us] [-t [file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] \\", 418 " [-c cpu-list] [-H cpu-list] [-P priority] [-b N] [-E N] [--no-header] [--no-summary] \\", 419 " [--no-index] [--with-zeros] [-C [cgroup_name]] [--warm-up]", 420 "", 421 " -h/--help: print this menu", 422 " -a/--auto: set automatic trace mode, stopping the session if argument in us sample is hit", 423 " -p/--period us: osnoise period in us", 424 " -r/--runtime us: osnoise runtime in us", 425 " -s/--stop us: stop trace if a single sample is higher than the argument in us", 426 " -S/--stop-total us: stop trace if the total sample is higher than the argument in us", 427 " -T/--threshold us: the minimum delta to be considered a noise", 428 " -c/--cpus cpu-list: list of cpus to run osnoise threads", 429 " -H/--house-keeping cpus: run rtla control threads only on the given cpus", 430 " -C/--cgroup [cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited", 431 " -d/--duration time[s|m|h|d]: duration of the session", 432 " -D/--debug: print debug info", 433 " -t/--trace [file]: save the stopped trace to [file|osnoise_trace.txt]", 434 " -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed", 435 " --filter <filter>: enable a trace event filter to the previous -e event", 436 " --trigger <trigger>: enable a trace event trigger to the previous -e event", 437 " -b/--bucket-size N: set the histogram bucket size (default 1)", 438 " -E/--entries N: set the number of entries of the histogram (default 256)", 439 " --no-header: do not print header", 440 " --no-summary: do not print summary", 441 " --no-index: do not print index", 442 " --with-zeros: print zero only entries", 443 " -P/--priority o:prio|r:prio|f:prio|d:runtime:period: set scheduling parameters", 444 " o:prio - use SCHED_OTHER with prio", 445 " r:prio - use SCHED_RR with prio", 446 " f:prio - use SCHED_FIFO with prio", 447 " d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period", 448 " in nanoseconds", 449 " --warm-up: let the workload run for s seconds before collecting data", 450 " --trace-buffer-size kB: set the per-cpu trace buffer size in kB", 451 " --on-threshold <action>: define action to be executed at stop-total threshold, multiple are allowed", 452 " --on-end <action>: define action to be executed at measurement end, multiple are allowed", 453 NULL, 454 }; 455 456 fprintf(stderr, "rtla osnoise hist: a per-cpu histogram of the OS noise (version %s)\n", 457 VERSION); 458 459 for (i = 0; msg[i]; i++) 460 fprintf(stderr, "%s\n", msg[i]); 461 462 exit(EXIT_SUCCESS); 463 } 464 465 /* 466 * osnoise_hist_parse_args - allocs, parse and fill the cmd line parameters 467 */ 468 static struct common_params 469 *osnoise_hist_parse_args(int argc, char *argv[]) 470 { 471 struct osnoise_params *params; 472 struct trace_events *tevent; 473 int retval; 474 int c; 475 char *trace_output = NULL; 476 477 params = calloc(1, sizeof(*params)); 478 if (!params) 479 exit(1); 480 481 actions_init(¶ms->common.threshold_actions); 482 actions_init(¶ms->common.end_actions); 483 484 /* display data in microseconds */ 485 params->common.output_divisor = 1000; 486 params->common.hist.bucket_size = 1; 487 params->common.hist.entries = 256; 488 489 while (1) { 490 static struct option long_options[] = { 491 {"auto", required_argument, 0, 'a'}, 492 {"bucket-size", required_argument, 0, 'b'}, 493 {"entries", required_argument, 0, 'E'}, 494 {"cpus", required_argument, 0, 'c'}, 495 {"cgroup", optional_argument, 0, 'C'}, 496 {"debug", no_argument, 0, 'D'}, 497 {"duration", required_argument, 0, 'd'}, 498 {"house-keeping", required_argument, 0, 'H'}, 499 {"help", no_argument, 0, 'h'}, 500 {"period", required_argument, 0, 'p'}, 501 {"priority", required_argument, 0, 'P'}, 502 {"runtime", required_argument, 0, 'r'}, 503 {"stop", required_argument, 0, 's'}, 504 {"stop-total", required_argument, 0, 'S'}, 505 {"trace", optional_argument, 0, 't'}, 506 {"event", required_argument, 0, 'e'}, 507 {"threshold", required_argument, 0, 'T'}, 508 {"no-header", no_argument, 0, '0'}, 509 {"no-summary", no_argument, 0, '1'}, 510 {"no-index", no_argument, 0, '2'}, 511 {"with-zeros", no_argument, 0, '3'}, 512 {"trigger", required_argument, 0, '4'}, 513 {"filter", required_argument, 0, '5'}, 514 {"warm-up", required_argument, 0, '6'}, 515 {"trace-buffer-size", required_argument, 0, '7'}, 516 {"on-threshold", required_argument, 0, '8'}, 517 {"on-end", required_argument, 0, '9'}, 518 {0, 0, 0, 0} 519 }; 520 521 c = getopt_long(argc, argv, "a:c:C::b:d:e:E:DhH:p:P:r:s:S:t::T:01234:5:6:7:", 522 long_options, NULL); 523 524 /* detect the end of the options. */ 525 if (c == -1) 526 break; 527 528 switch (c) { 529 case 'a': 530 /* set sample stop to auto_thresh */ 531 params->common.stop_us = get_llong_from_str(optarg); 532 533 /* set sample threshold to 1 */ 534 params->threshold = 1; 535 536 /* set trace */ 537 if (!trace_output) 538 trace_output = "osnoise_trace.txt"; 539 540 break; 541 case 'b': 542 params->common.hist.bucket_size = get_llong_from_str(optarg); 543 if (params->common.hist.bucket_size == 0 || 544 params->common.hist.bucket_size >= 1000000) 545 fatal("Bucket size needs to be > 0 and <= 1000000"); 546 break; 547 case 'c': 548 retval = parse_cpu_set(optarg, ¶ms->common.monitored_cpus); 549 if (retval) 550 fatal("Invalid -c cpu list"); 551 params->common.cpus = optarg; 552 break; 553 case 'C': 554 params->common.cgroup = 1; 555 params->common.cgroup_name = parse_optional_arg(argc, argv); 556 break; 557 case 'D': 558 config_debug = 1; 559 break; 560 case 'd': 561 params->common.duration = parse_seconds_duration(optarg); 562 if (!params->common.duration) 563 fatal("Invalid -D duration"); 564 break; 565 case 'e': 566 tevent = trace_event_alloc(optarg); 567 if (!tevent) 568 fatal("Error alloc trace event"); 569 570 if (params->common.events) 571 tevent->next = params->common.events; 572 573 params->common.events = tevent; 574 break; 575 case 'E': 576 params->common.hist.entries = get_llong_from_str(optarg); 577 if (params->common.hist.entries < 10 || 578 params->common.hist.entries > 9999999) 579 fatal("Entries must be > 10 and < 9999999"); 580 break; 581 case 'h': 582 case '?': 583 osnoise_hist_usage(); 584 break; 585 case 'H': 586 params->common.hk_cpus = 1; 587 retval = parse_cpu_set(optarg, ¶ms->common.hk_cpu_set); 588 if (retval) 589 fatal("Error parsing house keeping CPUs"); 590 break; 591 case 'p': 592 params->period = get_llong_from_str(optarg); 593 if (params->period > 10000000) 594 fatal("Period longer than 10 s"); 595 break; 596 case 'P': 597 retval = parse_prio(optarg, ¶ms->common.sched_param); 598 if (retval == -1) 599 fatal("Invalid -P priority"); 600 params->common.set_sched = 1; 601 break; 602 case 'r': 603 params->runtime = get_llong_from_str(optarg); 604 if (params->runtime < 100) 605 fatal("Runtime shorter than 100 us"); 606 break; 607 case 's': 608 params->common.stop_us = get_llong_from_str(optarg); 609 break; 610 case 'S': 611 params->common.stop_total_us = get_llong_from_str(optarg); 612 break; 613 case 'T': 614 params->threshold = get_llong_from_str(optarg); 615 break; 616 case 't': 617 trace_output = parse_optional_arg(argc, argv); 618 if (!trace_output) 619 trace_output = "osnoise_trace.txt"; 620 break; 621 case '0': /* no header */ 622 params->common.hist.no_header = 1; 623 break; 624 case '1': /* no summary */ 625 params->common.hist.no_summary = 1; 626 break; 627 case '2': /* no index */ 628 params->common.hist.no_index = 1; 629 break; 630 case '3': /* with zeros */ 631 params->common.hist.with_zeros = 1; 632 break; 633 case '4': /* trigger */ 634 if (params->common.events) { 635 retval = trace_event_add_trigger(params->common.events, optarg); 636 if (retval) 637 fatal("Error adding trigger %s", optarg); 638 } else { 639 fatal("--trigger requires a previous -e"); 640 } 641 break; 642 case '5': /* filter */ 643 if (params->common.events) { 644 retval = trace_event_add_filter(params->common.events, optarg); 645 if (retval) 646 fatal("Error adding filter %s", optarg); 647 } else { 648 fatal("--filter requires a previous -e"); 649 } 650 break; 651 case '6': 652 params->common.warmup = get_llong_from_str(optarg); 653 break; 654 case '7': 655 params->common.buffer_size = get_llong_from_str(optarg); 656 break; 657 case '8': 658 retval = actions_parse(¶ms->common.threshold_actions, optarg, 659 "osnoise_trace.txt"); 660 if (retval) 661 fatal("Invalid action %s", optarg); 662 break; 663 case '9': 664 retval = actions_parse(¶ms->common.end_actions, optarg, 665 "osnoise_trace.txt"); 666 if (retval) 667 fatal("Invalid action %s", optarg); 668 break; 669 default: 670 fatal("Invalid option"); 671 } 672 } 673 674 if (trace_output) 675 actions_add_trace_output(¶ms->common.threshold_actions, trace_output); 676 677 if (geteuid()) 678 fatal("rtla needs root permission"); 679 680 if (params->common.hist.no_index && !params->common.hist.with_zeros) 681 fatal("no-index set and with-zeros not set - it does not make sense"); 682 683 return ¶ms->common; 684 } 685 686 /* 687 * osnoise_hist_apply_config - apply the hist configs to the initialized tool 688 */ 689 static int 690 osnoise_hist_apply_config(struct osnoise_tool *tool) 691 { 692 return osnoise_apply_config(tool, to_osnoise_params(tool->params)); 693 } 694 695 /* 696 * osnoise_init_hist - initialize a osnoise hist tool with parameters 697 */ 698 static struct osnoise_tool 699 *osnoise_init_hist(struct common_params *params) 700 { 701 struct osnoise_tool *tool; 702 int nr_cpus; 703 704 nr_cpus = sysconf(_SC_NPROCESSORS_CONF); 705 706 tool = osnoise_init_tool("osnoise_hist"); 707 if (!tool) 708 return NULL; 709 710 tool->data = osnoise_alloc_histogram(nr_cpus, params->hist.entries, 711 params->hist.bucket_size); 712 if (!tool->data) 713 goto out_err; 714 715 return tool; 716 717 out_err: 718 osnoise_destroy_tool(tool); 719 return NULL; 720 } 721 722 static int osnoise_hist_enable(struct osnoise_tool *tool) 723 { 724 int retval; 725 726 retval = osnoise_init_trace_hist(tool); 727 if (retval) 728 return retval; 729 730 return osnoise_enable(tool); 731 } 732 733 static int osnoise_hist_main_loop(struct osnoise_tool *tool) 734 { 735 int retval; 736 737 retval = hist_main_loop(tool); 738 osnoise_read_trace_hist(tool); 739 740 return retval; 741 } 742 743 struct tool_ops osnoise_hist_ops = { 744 .tracer = "osnoise", 745 .comm_prefix = "osnoise/", 746 .parse_args = osnoise_hist_parse_args, 747 .init_tool = osnoise_init_hist, 748 .apply_config = osnoise_hist_apply_config, 749 .enable = osnoise_hist_enable, 750 .main = osnoise_hist_main_loop, 751 .print_stats = osnoise_print_stats, 752 .free = osnoise_free_hist_tool, 753 }; 754