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 (cpu = 0; cpu < data->nr_cpus; cpu++) { 251 if (params->common.cpus && !CPU_ISSET(cpu, ¶ms->common.monitored_cpus)) 252 continue; 253 254 if (!data->hist[cpu].count) 255 continue; 256 257 trace_seq_printf(s, " CPU-%03d", cpu); 258 } 259 trace_seq_printf(s, "\n"); 260 261 trace_seq_do_printf(s); 262 trace_seq_reset(s); 263 } 264 265 /* 266 * osnoise_print_summary - print the summary of the hist data to the output 267 */ 268 static void 269 osnoise_print_summary(struct osnoise_params *params, 270 struct trace_instance *trace, 271 struct osnoise_hist_data *data) 272 { 273 int cpu; 274 275 if (params->common.hist.no_summary) 276 return; 277 278 if (!params->common.hist.no_index) 279 trace_seq_printf(trace->seq, "count:"); 280 281 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 282 if (params->common.cpus && !CPU_ISSET(cpu, ¶ms->common.monitored_cpus)) 283 continue; 284 285 if (!data->hist[cpu].count) 286 continue; 287 288 trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].count); 289 } 290 trace_seq_printf(trace->seq, "\n"); 291 292 if (!params->common.hist.no_index) 293 trace_seq_printf(trace->seq, "min: "); 294 295 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 296 if (params->common.cpus && !CPU_ISSET(cpu, ¶ms->common.monitored_cpus)) 297 continue; 298 299 if (!data->hist[cpu].count) 300 continue; 301 302 trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].min_sample); 303 304 } 305 trace_seq_printf(trace->seq, "\n"); 306 307 if (!params->common.hist.no_index) 308 trace_seq_printf(trace->seq, "avg: "); 309 310 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 311 if (params->common.cpus && !CPU_ISSET(cpu, ¶ms->common.monitored_cpus)) 312 continue; 313 314 if (!data->hist[cpu].count) 315 continue; 316 317 if (data->hist[cpu].count) 318 trace_seq_printf(trace->seq, "%9.2f ", 319 ((double) data->hist[cpu].sum_sample) / data->hist[cpu].count); 320 else 321 trace_seq_printf(trace->seq, " - "); 322 } 323 trace_seq_printf(trace->seq, "\n"); 324 325 if (!params->common.hist.no_index) 326 trace_seq_printf(trace->seq, "max: "); 327 328 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 329 if (params->common.cpus && !CPU_ISSET(cpu, ¶ms->common.monitored_cpus)) 330 continue; 331 332 if (!data->hist[cpu].count) 333 continue; 334 335 trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].max_sample); 336 337 } 338 trace_seq_printf(trace->seq, "\n"); 339 trace_seq_do_printf(trace->seq); 340 trace_seq_reset(trace->seq); 341 } 342 343 /* 344 * osnoise_print_stats - print data for all CPUs 345 */ 346 static void 347 osnoise_print_stats(struct osnoise_tool *tool) 348 { 349 struct osnoise_params *params = to_osnoise_params(tool->params); 350 struct osnoise_hist_data *data = tool->data; 351 struct trace_instance *trace = &tool->trace; 352 int has_samples = 0; 353 int bucket, cpu; 354 int total; 355 356 osnoise_hist_header(tool); 357 358 for (bucket = 0; bucket < data->entries; bucket++) { 359 total = 0; 360 361 if (!params->common.hist.no_index) 362 trace_seq_printf(trace->seq, "%-6d", 363 bucket * data->bucket_size); 364 365 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 366 if (params->common.cpus && !CPU_ISSET(cpu, ¶ms->common.monitored_cpus)) 367 continue; 368 369 if (!data->hist[cpu].count) 370 continue; 371 372 total += data->hist[cpu].samples[bucket]; 373 trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].samples[bucket]); 374 } 375 376 if (total == 0 && !params->common.hist.with_zeros) { 377 trace_seq_reset(trace->seq); 378 continue; 379 } 380 381 /* There are samples above the threshold */ 382 has_samples = 1; 383 trace_seq_printf(trace->seq, "\n"); 384 trace_seq_do_printf(trace->seq); 385 trace_seq_reset(trace->seq); 386 } 387 388 /* 389 * If no samples were recorded, skip calculations, print zeroed statistics 390 * and return. 391 */ 392 if (!has_samples) { 393 trace_seq_reset(trace->seq); 394 trace_seq_printf(trace->seq, "over: 0\ncount: 0\nmin: 0\navg: 0\nmax: 0\n"); 395 trace_seq_do_printf(trace->seq); 396 trace_seq_reset(trace->seq); 397 return; 398 } 399 400 if (!params->common.hist.no_index) 401 trace_seq_printf(trace->seq, "over: "); 402 403 for (cpu = 0; cpu < data->nr_cpus; cpu++) { 404 if (params->common.cpus && !CPU_ISSET(cpu, ¶ms->common.monitored_cpus)) 405 continue; 406 407 if (!data->hist[cpu].count) 408 continue; 409 410 trace_seq_printf(trace->seq, "%9d ", 411 data->hist[cpu].samples[data->entries]); 412 } 413 trace_seq_printf(trace->seq, "\n"); 414 trace_seq_do_printf(trace->seq); 415 trace_seq_reset(trace->seq); 416 417 osnoise_print_summary(params, trace, data); 418 osnoise_report_missed_events(tool); 419 } 420 421 /* 422 * osnoise_hist_usage - prints osnoise hist usage message 423 */ 424 static void osnoise_hist_usage(char *usage) 425 { 426 int i; 427 428 static const char * const msg[] = { 429 "", 430 " usage: rtla osnoise hist [-h] [-D] [-d s] [-a us] [-p us] [-r us] [-s us] [-S us] \\", 431 " [-T us] [-t[file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] \\", 432 " [-c cpu-list] [-H cpu-list] [-P priority] [-b N] [-E N] [--no-header] [--no-summary] \\", 433 " [--no-index] [--with-zeros] [-C[=cgroup_name]] [--warm-up]", 434 "", 435 " -h/--help: print this menu", 436 " -a/--auto: set automatic trace mode, stopping the session if argument in us sample is hit", 437 " -p/--period us: osnoise period in us", 438 " -r/--runtime us: osnoise runtime in us", 439 " -s/--stop us: stop trace if a single sample is higher than the argument in us", 440 " -S/--stop-total us: stop trace if the total sample is higher than the argument in us", 441 " -T/--threshold us: the minimum delta to be considered a noise", 442 " -c/--cpus cpu-list: list of cpus to run osnoise threads", 443 " -H/--house-keeping cpus: run rtla control threads only on the given cpus", 444 " -C/--cgroup[=cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited", 445 " -d/--duration time[s|m|h|d]: duration of the session", 446 " -D/--debug: print debug info", 447 " -t/--trace[file]: save the stopped trace to [file|osnoise_trace.txt]", 448 " -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed", 449 " --filter <filter>: enable a trace event filter to the previous -e event", 450 " --trigger <trigger>: enable a trace event trigger to the previous -e event", 451 " -b/--bucket-size N: set the histogram bucket size (default 1)", 452 " -E/--entries N: set the number of entries of the histogram (default 256)", 453 " --no-header: do not print header", 454 " --no-summary: do not print summary", 455 " --no-index: do not print index", 456 " --with-zeros: print zero only entries", 457 " -P/--priority o:prio|r:prio|f:prio|d:runtime:period: set scheduling parameters", 458 " o:prio - use SCHED_OTHER with prio", 459 " r:prio - use SCHED_RR with prio", 460 " f:prio - use SCHED_FIFO with prio", 461 " d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period", 462 " in nanoseconds", 463 " --warm-up: let the workload run for s seconds before collecting data", 464 " --trace-buffer-size kB: set the per-cpu trace buffer size in kB", 465 " --on-threshold <action>: define action to be executed at stop-total threshold, multiple are allowed", 466 " --on-end <action>: define action to be executed at measurement end, multiple are allowed", 467 NULL, 468 }; 469 470 if (usage) 471 fprintf(stderr, "%s\n", usage); 472 473 fprintf(stderr, "rtla osnoise hist: a per-cpu histogram of the OS noise (version %s)\n", 474 VERSION); 475 476 for (i = 0; msg[i]; i++) 477 fprintf(stderr, "%s\n", msg[i]); 478 479 if (usage) 480 exit(EXIT_FAILURE); 481 482 exit(EXIT_SUCCESS); 483 } 484 485 /* 486 * osnoise_hist_parse_args - allocs, parse and fill the cmd line parameters 487 */ 488 static struct common_params 489 *osnoise_hist_parse_args(int argc, char *argv[]) 490 { 491 struct osnoise_params *params; 492 struct trace_events *tevent; 493 int retval; 494 int c; 495 char *trace_output = NULL; 496 497 params = calloc(1, sizeof(*params)); 498 if (!params) 499 exit(1); 500 501 actions_init(¶ms->common.threshold_actions); 502 actions_init(¶ms->common.end_actions); 503 504 /* display data in microseconds */ 505 params->common.output_divisor = 1000; 506 params->common.hist.bucket_size = 1; 507 params->common.hist.entries = 256; 508 509 while (1) { 510 static struct option long_options[] = { 511 {"auto", required_argument, 0, 'a'}, 512 {"bucket-size", required_argument, 0, 'b'}, 513 {"entries", required_argument, 0, 'E'}, 514 {"cpus", required_argument, 0, 'c'}, 515 {"cgroup", optional_argument, 0, 'C'}, 516 {"debug", no_argument, 0, 'D'}, 517 {"duration", required_argument, 0, 'd'}, 518 {"house-keeping", required_argument, 0, 'H'}, 519 {"help", no_argument, 0, 'h'}, 520 {"period", required_argument, 0, 'p'}, 521 {"priority", required_argument, 0, 'P'}, 522 {"runtime", required_argument, 0, 'r'}, 523 {"stop", required_argument, 0, 's'}, 524 {"stop-total", required_argument, 0, 'S'}, 525 {"trace", optional_argument, 0, 't'}, 526 {"event", required_argument, 0, 'e'}, 527 {"threshold", required_argument, 0, 'T'}, 528 {"no-header", no_argument, 0, '0'}, 529 {"no-summary", no_argument, 0, '1'}, 530 {"no-index", no_argument, 0, '2'}, 531 {"with-zeros", no_argument, 0, '3'}, 532 {"trigger", required_argument, 0, '4'}, 533 {"filter", required_argument, 0, '5'}, 534 {"warm-up", required_argument, 0, '6'}, 535 {"trace-buffer-size", required_argument, 0, '7'}, 536 {"on-threshold", required_argument, 0, '8'}, 537 {"on-end", required_argument, 0, '9'}, 538 {0, 0, 0, 0} 539 }; 540 541 /* getopt_long stores the option index here. */ 542 int option_index = 0; 543 544 c = getopt_long(argc, argv, "a:c:C::b:d:e:E:DhH:p:P:r:s:S:t::T:01234:5:6:7:", 545 long_options, &option_index); 546 547 /* detect the end of the options. */ 548 if (c == -1) 549 break; 550 551 switch (c) { 552 case 'a': 553 /* set sample stop to auto_thresh */ 554 params->common.stop_us = get_llong_from_str(optarg); 555 556 /* set sample threshold to 1 */ 557 params->threshold = 1; 558 559 /* set trace */ 560 trace_output = "osnoise_trace.txt"; 561 562 break; 563 case 'b': 564 params->common.hist.bucket_size = get_llong_from_str(optarg); 565 if (params->common.hist.bucket_size == 0 || 566 params->common.hist.bucket_size >= 1000000) 567 osnoise_hist_usage("Bucket size needs to be > 0 and <= 1000000\n"); 568 break; 569 case 'c': 570 retval = parse_cpu_set(optarg, ¶ms->common.monitored_cpus); 571 if (retval) 572 osnoise_hist_usage("\nInvalid -c cpu list\n"); 573 params->common.cpus = optarg; 574 break; 575 case 'C': 576 params->common.cgroup = 1; 577 if (!optarg) { 578 /* will inherit this cgroup */ 579 params->common.cgroup_name = NULL; 580 } else if (*optarg == '=') { 581 /* skip the = */ 582 params->common.cgroup_name = ++optarg; 583 } 584 break; 585 case 'D': 586 config_debug = 1; 587 break; 588 case 'd': 589 params->common.duration = parse_seconds_duration(optarg); 590 if (!params->common.duration) 591 osnoise_hist_usage("Invalid -D duration\n"); 592 break; 593 case 'e': 594 tevent = trace_event_alloc(optarg); 595 if (!tevent) { 596 err_msg("Error alloc trace event"); 597 exit(EXIT_FAILURE); 598 } 599 600 if (params->common.events) 601 tevent->next = params->common.events; 602 603 params->common.events = tevent; 604 break; 605 case 'E': 606 params->common.hist.entries = get_llong_from_str(optarg); 607 if (params->common.hist.entries < 10 || 608 params->common.hist.entries > 9999999) 609 osnoise_hist_usage("Entries must be > 10 and < 9999999\n"); 610 break; 611 case 'h': 612 case '?': 613 osnoise_hist_usage(NULL); 614 break; 615 case 'H': 616 params->common.hk_cpus = 1; 617 retval = parse_cpu_set(optarg, ¶ms->common.hk_cpu_set); 618 if (retval) { 619 err_msg("Error parsing house keeping CPUs\n"); 620 exit(EXIT_FAILURE); 621 } 622 break; 623 case 'p': 624 params->period = get_llong_from_str(optarg); 625 if (params->period > 10000000) 626 osnoise_hist_usage("Period longer than 10 s\n"); 627 break; 628 case 'P': 629 retval = parse_prio(optarg, ¶ms->common.sched_param); 630 if (retval == -1) 631 osnoise_hist_usage("Invalid -P priority"); 632 params->common.set_sched = 1; 633 break; 634 case 'r': 635 params->runtime = get_llong_from_str(optarg); 636 if (params->runtime < 100) 637 osnoise_hist_usage("Runtime shorter than 100 us\n"); 638 break; 639 case 's': 640 params->common.stop_us = get_llong_from_str(optarg); 641 break; 642 case 'S': 643 params->common.stop_total_us = get_llong_from_str(optarg); 644 break; 645 case 'T': 646 params->threshold = get_llong_from_str(optarg); 647 break; 648 case 't': 649 if (optarg) { 650 if (optarg[0] == '=') 651 trace_output = &optarg[1]; 652 else 653 trace_output = &optarg[0]; 654 } else if (optind < argc && argv[optind][0] != '0') 655 trace_output = argv[optind]; 656 else 657 trace_output = "osnoise_trace.txt"; 658 break; 659 case '0': /* no header */ 660 params->common.hist.no_header = 1; 661 break; 662 case '1': /* no summary */ 663 params->common.hist.no_summary = 1; 664 break; 665 case '2': /* no index */ 666 params->common.hist.no_index = 1; 667 break; 668 case '3': /* with zeros */ 669 params->common.hist.with_zeros = 1; 670 break; 671 case '4': /* trigger */ 672 if (params->common.events) { 673 retval = trace_event_add_trigger(params->common.events, optarg); 674 if (retval) { 675 err_msg("Error adding trigger %s\n", optarg); 676 exit(EXIT_FAILURE); 677 } 678 } else { 679 osnoise_hist_usage("--trigger requires a previous -e\n"); 680 } 681 break; 682 case '5': /* filter */ 683 if (params->common.events) { 684 retval = trace_event_add_filter(params->common.events, optarg); 685 if (retval) { 686 err_msg("Error adding filter %s\n", optarg); 687 exit(EXIT_FAILURE); 688 } 689 } else { 690 osnoise_hist_usage("--filter requires a previous -e\n"); 691 } 692 break; 693 case '6': 694 params->common.warmup = get_llong_from_str(optarg); 695 break; 696 case '7': 697 params->common.buffer_size = get_llong_from_str(optarg); 698 break; 699 case '8': 700 retval = actions_parse(¶ms->common.threshold_actions, optarg, 701 "osnoise_trace.txt"); 702 if (retval) { 703 err_msg("Invalid action %s\n", optarg); 704 exit(EXIT_FAILURE); 705 } 706 break; 707 case '9': 708 retval = actions_parse(¶ms->common.end_actions, optarg, 709 "osnoise_trace.txt"); 710 if (retval) { 711 err_msg("Invalid action %s\n", optarg); 712 exit(EXIT_FAILURE); 713 } 714 break; 715 default: 716 osnoise_hist_usage("Invalid option"); 717 } 718 } 719 720 if (trace_output) 721 actions_add_trace_output(¶ms->common.threshold_actions, trace_output); 722 723 if (geteuid()) { 724 err_msg("rtla needs root permission\n"); 725 exit(EXIT_FAILURE); 726 } 727 728 if (params->common.hist.no_index && !params->common.hist.with_zeros) 729 osnoise_hist_usage("no-index set and with-zeros not set - it does not make sense"); 730 731 return ¶ms->common; 732 } 733 734 /* 735 * osnoise_hist_apply_config - apply the hist configs to the initialized tool 736 */ 737 static int 738 osnoise_hist_apply_config(struct osnoise_tool *tool) 739 { 740 return osnoise_apply_config(tool, to_osnoise_params(tool->params)); 741 } 742 743 /* 744 * osnoise_init_hist - initialize a osnoise hist tool with parameters 745 */ 746 static struct osnoise_tool 747 *osnoise_init_hist(struct common_params *params) 748 { 749 struct osnoise_tool *tool; 750 int nr_cpus; 751 752 nr_cpus = sysconf(_SC_NPROCESSORS_CONF); 753 754 tool = osnoise_init_tool("osnoise_hist"); 755 if (!tool) 756 return NULL; 757 758 tool->data = osnoise_alloc_histogram(nr_cpus, params->hist.entries, 759 params->hist.bucket_size); 760 if (!tool->data) 761 goto out_err; 762 763 return tool; 764 765 out_err: 766 osnoise_destroy_tool(tool); 767 return NULL; 768 } 769 770 static int osnoise_hist_enable(struct osnoise_tool *tool) 771 { 772 int retval; 773 774 retval = osnoise_init_trace_hist(tool); 775 if (retval) 776 return retval; 777 778 return osnoise_enable(tool); 779 } 780 781 static int osnoise_hist_main_loop(struct osnoise_tool *tool) 782 { 783 int retval; 784 785 retval = hist_main_loop(tool); 786 osnoise_read_trace_hist(tool); 787 788 return retval; 789 } 790 791 struct tool_ops osnoise_hist_ops = { 792 .tracer = "osnoise", 793 .comm_prefix = "osnoise/", 794 .parse_args = osnoise_hist_parse_args, 795 .init_tool = osnoise_init_hist, 796 .apply_config = osnoise_hist_apply_config, 797 .enable = osnoise_hist_enable, 798 .main = osnoise_hist_main_loop, 799 .print_stats = osnoise_print_stats, 800 .free = osnoise_free_hist_tool, 801 }; 802