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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#include <getopt.h>
7#include <stdlib.h>
8#include <string.h>
9#include <signal.h>
10#include <unistd.h>
11#include <errno.h>
12#include <stdio.h>
13#include <time.h>
14
15#include "utils.h"
16#include "osnoise.h"
17
18struct osnoise_hist_params {
19 char *cpus;
20 char *monitored_cpus;
21 char *trace_output;
22 unsigned long long runtime;
23 unsigned long long period;
24 long long threshold;
25 long long stop_us;
26 long long stop_total_us;
27 int sleep_time;
28 int duration;
29 int set_sched;
30 int output_divisor;
31 struct sched_attr sched_param;
32 struct trace_events *events;
33
34 char no_header;
35 char no_summary;
36 char no_index;
37 char with_zeros;
38 int bucket_size;
39 int entries;
40};
41
42struct osnoise_hist_cpu {
43 int *samples;
44 int count;
45
46 unsigned long long min_sample;
47 unsigned long long sum_sample;
48 unsigned long long max_sample;
49
50};
51
52struct osnoise_hist_data {
53 struct tracefs_hist *trace_hist;
54 struct osnoise_hist_cpu *hist;
55 int entries;
56 int bucket_size;
57 int nr_cpus;
58};
59
60/*
61 * osnoise_free_histogram - free runtime data
62 */
63static void
64osnoise_free_histogram(struct osnoise_hist_data *data)
65{
66 int cpu;
67
68 /* one histogram for IRQ and one for thread, per CPU */
69 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
70 if (data->hist[cpu].samples)
71 free(data->hist[cpu].samples);
72 }
73
74 /* one set of histograms per CPU */
75 if (data->hist)
76 free(data->hist);
77
78 free(data);
79}
80
81/*
82 * osnoise_alloc_histogram - alloc runtime data
83 */
84static struct osnoise_hist_data
85*osnoise_alloc_histogram(int nr_cpus, int entries, int bucket_size)
86{
87 struct osnoise_hist_data *data;
88 int cpu;
89
90 data = calloc(1, sizeof(*data));
91 if (!data)
92 return NULL;
93
94 data->entries = entries;
95 data->bucket_size = bucket_size;
96 data->nr_cpus = nr_cpus;
97
98 data->hist = calloc(1, sizeof(*data->hist) * nr_cpus);
99 if (!data->hist)
100 goto cleanup;
101
102 for (cpu = 0; cpu < nr_cpus; cpu++) {
103 data->hist[cpu].samples = calloc(1, sizeof(*data->hist->samples) * (entries + 1));
104 if (!data->hist[cpu].samples)
105 goto cleanup;
106 }
107
108 /* set the min to max */
109 for (cpu = 0; cpu < nr_cpus; cpu++)
110 data->hist[cpu].min_sample = ~0;
111
112 return data;
113
114cleanup:
115 osnoise_free_histogram(data);
116 return NULL;
117}
118
119static void osnoise_hist_update_multiple(struct osnoise_tool *tool, int cpu,
120 unsigned long long duration, int count)
121{
122 struct osnoise_hist_params *params = tool->params;
123 struct osnoise_hist_data *data = tool->data;
124 int entries = data->entries;
125 int bucket;
126 int *hist;
127
128 if (params->output_divisor)
129 duration = duration / params->output_divisor;
130
131 if (data->bucket_size)
132 bucket = duration / data->bucket_size;
133
134 hist = data->hist[cpu].samples;
135 data->hist[cpu].count += count;
136 update_min(&data->hist[cpu].min_sample, &duration);
137 update_sum(&data->hist[cpu].sum_sample, &duration);
138 update_max(&data->hist[cpu].max_sample, &duration);
139
140 if (bucket < entries)
141 hist[bucket] += count;
142 else
143 hist[entries] += count;
144}
145
146/*
147 * osnoise_destroy_trace_hist - disable events used to collect histogram
148 */
149static void osnoise_destroy_trace_hist(struct osnoise_tool *tool)
150{
151 struct osnoise_hist_data *data = tool->data;
152
153 tracefs_hist_pause(tool->trace.inst, data->trace_hist);
154 tracefs_hist_destroy(tool->trace.inst, data->trace_hist);
155}
156
157/*
158 * osnoise_init_trace_hist - enable events used to collect histogram
159 */
160static int osnoise_init_trace_hist(struct osnoise_tool *tool)
161{
162 struct osnoise_hist_params *params = tool->params;
163 struct osnoise_hist_data *data = tool->data;
164 int bucket_size;
165 char buff[128];
166 int retval = 0;
167
168 /*
169 * Set the size of the bucket.
170 */
171 bucket_size = params->output_divisor * params->bucket_size;
172 snprintf(buff, sizeof(buff), "duration.buckets=%d", bucket_size);
173
174 data->trace_hist = tracefs_hist_alloc(tool->trace.tep, "osnoise", "sample_threshold",
175 buff, TRACEFS_HIST_KEY_NORMAL);
176 if (!data->trace_hist)
177 return 1;
178
179 retval = tracefs_hist_add_key(data->trace_hist, "cpu", 0);
180 if (retval)
181 goto out_err;
182
183 retval = tracefs_hist_start(tool->trace.inst, data->trace_hist);
184 if (retval)
185 goto out_err;
186
187 return 0;
188
189out_err:
190 osnoise_destroy_trace_hist(tool);
191 return 1;
192}
193
194/*
195 * osnoise_read_trace_hist - parse histogram file and file osnoise histogram
196 */
197static void osnoise_read_trace_hist(struct osnoise_tool *tool)
198{
199 struct osnoise_hist_data *data = tool->data;
200 long long cpu, counter, duration;
201 char *content, *position;
202
203 tracefs_hist_pause(tool->trace.inst, data->trace_hist);
204
205 content = tracefs_event_file_read(tool->trace.inst, "osnoise",
206 "sample_threshold",
207 "hist", NULL);
208 if (!content)
209 return;
210
211 position = content;
212 while (true) {
213 position = strstr(position, "duration: ~");
214 if (!position)
215 break;
216 position += strlen("duration: ~");
217 duration = get_llong_from_str(position);
218 if (duration == -1)
219 err_msg("error reading duration from histogram\n");
220
221 position = strstr(position, "cpu:");
222 if (!position)
223 break;
224 position += strlen("cpu: ");
225 cpu = get_llong_from_str(position);
226 if (cpu == -1)
227 err_msg("error reading cpu from histogram\n");
228
229 position = strstr(position, "hitcount:");
230 if (!position)
231 break;
232 position += strlen("hitcount: ");
233 counter = get_llong_from_str(position);
234 if (counter == -1)
235 err_msg("error reading counter from histogram\n");
236
237 osnoise_hist_update_multiple(tool, cpu, duration, counter);
238 }
239 free(content);
240}
241
242/*
243 * osnoise_hist_header - print the header of the tracer to the output
244 */
245static void osnoise_hist_header(struct osnoise_tool *tool)
246{
247 struct osnoise_hist_params *params = tool->params;
248 struct osnoise_hist_data *data = tool->data;
249 struct trace_seq *s = tool->trace.seq;
250 char duration[26];
251 int cpu;
252
253 if (params->no_header)
254 return;
255
256 get_duration(tool->start_time, duration, sizeof(duration));
257 trace_seq_printf(s, "# RTLA osnoise histogram\n");
258 trace_seq_printf(s, "# Time unit is %s (%s)\n",
259 params->output_divisor == 1 ? "nanoseconds" : "microseconds",
260 params->output_divisor == 1 ? "ns" : "us");
261
262 trace_seq_printf(s, "# Duration: %s\n", duration);
263
264 if (!params->no_index)
265 trace_seq_printf(s, "Index");
266
267 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
268 if (params->cpus && !params->monitored_cpus[cpu])
269 continue;
270
271 if (!data->hist[cpu].count)
272 continue;
273
274 trace_seq_printf(s, " CPU-%03d", cpu);
275 }
276 trace_seq_printf(s, "\n");
277
278 trace_seq_do_printf(s);
279 trace_seq_reset(s);
280}
281
282/*
283 * osnoise_print_summary - print the summary of the hist data to the output
284 */
285static void
286osnoise_print_summary(struct osnoise_hist_params *params,
287 struct trace_instance *trace,
288 struct osnoise_hist_data *data)
289{
290 int cpu;
291
292 if (params->no_summary)
293 return;
294
295 if (!params->no_index)
296 trace_seq_printf(trace->seq, "count:");
297
298 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
299 if (params->cpus && !params->monitored_cpus[cpu])
300 continue;
301
302 if (!data->hist[cpu].count)
303 continue;
304
305 trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].count);
306 }
307 trace_seq_printf(trace->seq, "\n");
308
309 if (!params->no_index)
310 trace_seq_printf(trace->seq, "min: ");
311
312 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
313 if (params->cpus && !params->monitored_cpus[cpu])
314 continue;
315
316 if (!data->hist[cpu].count)
317 continue;
318
319 trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].min_sample);
320
321 }
322 trace_seq_printf(trace->seq, "\n");
323
324 if (!params->no_index)
325 trace_seq_printf(trace->seq, "avg: ");
326
327 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
328 if (params->cpus && !params->monitored_cpus[cpu])
329 continue;
330
331 if (!data->hist[cpu].count)
332 continue;
333
334 if (data->hist[cpu].count)
335 trace_seq_printf(trace->seq, "%9llu ",
336 data->hist[cpu].sum_sample / data->hist[cpu].count);
337 else
338 trace_seq_printf(trace->seq, " - ");
339 }
340 trace_seq_printf(trace->seq, "\n");
341
342 if (!params->no_index)
343 trace_seq_printf(trace->seq, "max: ");
344
345 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
346 if (params->cpus && !params->monitored_cpus[cpu])
347 continue;
348
349 if (!data->hist[cpu].count)
350 continue;
351
352 trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].max_sample);
353
354 }
355 trace_seq_printf(trace->seq, "\n");
356 trace_seq_do_printf(trace->seq);
357 trace_seq_reset(trace->seq);
358}
359
360/*
361 * osnoise_print_stats - print data for all CPUs
362 */
363static void
364osnoise_print_stats(struct osnoise_hist_params *params, struct osnoise_tool *tool)
365{
366 struct osnoise_hist_data *data = tool->data;
367 struct trace_instance *trace = &tool->trace;
368 int bucket, cpu;
369 int total;
370
371 osnoise_hist_header(tool);
372
373 for (bucket = 0; bucket < data->entries; bucket++) {
374 total = 0;
375
376 if (!params->no_index)
377 trace_seq_printf(trace->seq, "%-6d",
378 bucket * data->bucket_size);
379
380 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
381 if (params->cpus && !params->monitored_cpus[cpu])
382 continue;
383
384 if (!data->hist[cpu].count)
385 continue;
386
387 total += data->hist[cpu].samples[bucket];
388 trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].samples[bucket]);
389 }
390
391 if (total == 0 && !params->with_zeros) {
392 trace_seq_reset(trace->seq);
393 continue;
394 }
395
396 trace_seq_printf(trace->seq, "\n");
397 trace_seq_do_printf(trace->seq);
398 trace_seq_reset(trace->seq);
399 }
400
401 if (!params->no_index)
402 trace_seq_printf(trace->seq, "over: ");
403
404 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
405 if (params->cpus && !params->monitored_cpus[cpu])
406 continue;
407
408 if (!data->hist[cpu].count)
409 continue;
410
411 trace_seq_printf(trace->seq, "%9d ",
412 data->hist[cpu].samples[data->entries]);
413 }
414 trace_seq_printf(trace->seq, "\n");
415 trace_seq_do_printf(trace->seq);
416 trace_seq_reset(trace->seq);
417
418 osnoise_print_summary(params, trace, data);
419}
420
421/*
422 * osnoise_hist_usage - prints osnoise hist usage message
423 */
424static 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] [-P priority] [-b N] [-E N] [--no-header] [--no-summary] [--no-index] \\",
433 " [--with-zeros]",
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 " -d/--duration time[s|m|h|d]: duration of the session",
444 " -D/--debug: print debug info",
445 " -t/--trace[=file]: save the stopped trace to [file|osnoise_trace.txt]",
446 " -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed",
447 " --filter <filter>: enable a trace event filter to the previous -e event",
448 " --trigger <trigger>: enable a trace event trigger to the previous -e event",
449 " -b/--bucket-size N: set the histogram bucket size (default 1)",
450 " -E/--entries N: set the number of entries of the histogram (default 256)",
451 " --no-header: do not print header",
452 " --no-summary: do not print summary",
453 " --no-index: do not print index",
454 " --with-zeros: print zero only entries",
455 " -P/--priority o:prio|r:prio|f:prio|d:runtime:period: set scheduling parameters",
456 " o:prio - use SCHED_OTHER with prio",
457 " r:prio - use SCHED_RR with prio",
458 " f:prio - use SCHED_FIFO with prio",
459 " d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period",
460 " in nanoseconds",
461 NULL,
462 };
463
464 if (usage)
465 fprintf(stderr, "%s\n", usage);
466
467 fprintf(stderr, "rtla osnoise hist: a per-cpu histogram of the OS noise (version %s)\n",
468 VERSION);
469
470 for (i = 0; msg[i]; i++)
471 fprintf(stderr, "%s\n", msg[i]);
472 exit(1);
473}
474
475/*
476 * osnoise_hist_parse_args - allocs, parse and fill the cmd line parameters
477 */
478static struct osnoise_hist_params
479*osnoise_hist_parse_args(int argc, char *argv[])
480{
481 struct osnoise_hist_params *params;
482 struct trace_events *tevent;
483 int retval;
484 int c;
485
486 params = calloc(1, sizeof(*params));
487 if (!params)
488 exit(1);
489
490 /* display data in microseconds */
491 params->output_divisor = 1000;
492 params->bucket_size = 1;
493 params->entries = 256;
494
495 while (1) {
496 static struct option long_options[] = {
497 {"auto", required_argument, 0, 'a'},
498 {"bucket-size", required_argument, 0, 'b'},
499 {"entries", required_argument, 0, 'E'},
500 {"cpus", required_argument, 0, 'c'},
501 {"debug", no_argument, 0, 'D'},
502 {"duration", required_argument, 0, 'd'},
503 {"help", no_argument, 0, 'h'},
504 {"period", required_argument, 0, 'p'},
505 {"priority", required_argument, 0, 'P'},
506 {"runtime", required_argument, 0, 'r'},
507 {"stop", required_argument, 0, 's'},
508 {"stop-total", required_argument, 0, 'S'},
509 {"trace", optional_argument, 0, 't'},
510 {"event", required_argument, 0, 'e'},
511 {"threshold", required_argument, 0, 'T'},
512 {"no-header", no_argument, 0, '0'},
513 {"no-summary", no_argument, 0, '1'},
514 {"no-index", no_argument, 0, '2'},
515 {"with-zeros", no_argument, 0, '3'},
516 {"trigger", required_argument, 0, '4'},
517 {"filter", required_argument, 0, '5'},
518 {0, 0, 0, 0}
519 };
520
521 /* getopt_long stores the option index here. */
522 int option_index = 0;
523
524 c = getopt_long(argc, argv, "a:c:b:d:e:E:Dhp:P:r:s:S:t::T:01234:5:",
525 long_options, &option_index);
526
527 /* detect the end of the options. */
528 if (c == -1)
529 break;
530
531 switch (c) {
532 case 'a':
533 /* set sample stop to auto_thresh */
534 params->stop_us = get_llong_from_str(optarg);
535
536 /* set sample threshold to 1 */
537 params->threshold = 1;
538
539 /* set trace */
540 params->trace_output = "osnoise_trace.txt";
541
542 break;
543 case 'b':
544 params->bucket_size = get_llong_from_str(optarg);
545 if ((params->bucket_size == 0) || (params->bucket_size >= 1000000))
546 osnoise_hist_usage("Bucket size needs to be > 0 and <= 1000000\n");
547 break;
548 case 'c':
549 retval = parse_cpu_list(optarg, ¶ms->monitored_cpus);
550 if (retval)
551 osnoise_hist_usage("\nInvalid -c cpu list\n");
552 params->cpus = optarg;
553 break;
554 case 'D':
555 config_debug = 1;
556 break;
557 case 'd':
558 params->duration = parse_seconds_duration(optarg);
559 if (!params->duration)
560 osnoise_hist_usage("Invalid -D duration\n");
561 break;
562 case 'e':
563 tevent = trace_event_alloc(optarg);
564 if (!tevent) {
565 err_msg("Error alloc trace event");
566 exit(EXIT_FAILURE);
567 }
568
569 if (params->events)
570 tevent->next = params->events;
571
572 params->events = tevent;
573 break;
574 case 'E':
575 params->entries = get_llong_from_str(optarg);
576 if ((params->entries < 10) || (params->entries > 9999999))
577 osnoise_hist_usage("Entries must be > 10 and < 9999999\n");
578 break;
579 case 'h':
580 case '?':
581 osnoise_hist_usage(NULL);
582 break;
583 case 'p':
584 params->period = get_llong_from_str(optarg);
585 if (params->period > 10000000)
586 osnoise_hist_usage("Period longer than 10 s\n");
587 break;
588 case 'P':
589 retval = parse_prio(optarg, ¶ms->sched_param);
590 if (retval == -1)
591 osnoise_hist_usage("Invalid -P priority");
592 params->set_sched = 1;
593 break;
594 case 'r':
595 params->runtime = get_llong_from_str(optarg);
596 if (params->runtime < 100)
597 osnoise_hist_usage("Runtime shorter than 100 us\n");
598 break;
599 case 's':
600 params->stop_us = get_llong_from_str(optarg);
601 break;
602 case 'S':
603 params->stop_total_us = get_llong_from_str(optarg);
604 break;
605 case 'T':
606 params->threshold = get_llong_from_str(optarg);
607 break;
608 case 't':
609 if (optarg)
610 /* skip = */
611 params->trace_output = &optarg[1];
612 else
613 params->trace_output = "osnoise_trace.txt";
614 break;
615 case '0': /* no header */
616 params->no_header = 1;
617 break;
618 case '1': /* no summary */
619 params->no_summary = 1;
620 break;
621 case '2': /* no index */
622 params->no_index = 1;
623 break;
624 case '3': /* with zeros */
625 params->with_zeros = 1;
626 break;
627 case '4': /* trigger */
628 if (params->events) {
629 retval = trace_event_add_trigger(params->events, optarg);
630 if (retval) {
631 err_msg("Error adding trigger %s\n", optarg);
632 exit(EXIT_FAILURE);
633 }
634 } else {
635 osnoise_hist_usage("--trigger requires a previous -e\n");
636 }
637 break;
638 case '5': /* filter */
639 if (params->events) {
640 retval = trace_event_add_filter(params->events, optarg);
641 if (retval) {
642 err_msg("Error adding filter %s\n", optarg);
643 exit(EXIT_FAILURE);
644 }
645 } else {
646 osnoise_hist_usage("--filter requires a previous -e\n");
647 }
648 break;
649 default:
650 osnoise_hist_usage("Invalid option");
651 }
652 }
653
654 if (geteuid()) {
655 err_msg("rtla needs root permission\n");
656 exit(EXIT_FAILURE);
657 }
658
659 if (params->no_index && !params->with_zeros)
660 osnoise_hist_usage("no-index set and with-zeros not set - it does not make sense");
661
662 return params;
663}
664
665/*
666 * osnoise_hist_apply_config - apply the hist configs to the initialized tool
667 */
668static int
669osnoise_hist_apply_config(struct osnoise_tool *tool, struct osnoise_hist_params *params)
670{
671 int retval;
672
673 if (!params->sleep_time)
674 params->sleep_time = 1;
675
676 if (params->cpus) {
677 retval = osnoise_set_cpus(tool->context, params->cpus);
678 if (retval) {
679 err_msg("Failed to apply CPUs config\n");
680 goto out_err;
681 }
682 }
683
684 if (params->runtime || params->period) {
685 retval = osnoise_set_runtime_period(tool->context,
686 params->runtime,
687 params->period);
688 if (retval) {
689 err_msg("Failed to set runtime and/or period\n");
690 goto out_err;
691 }
692 }
693
694 if (params->stop_us) {
695 retval = osnoise_set_stop_us(tool->context, params->stop_us);
696 if (retval) {
697 err_msg("Failed to set stop us\n");
698 goto out_err;
699 }
700 }
701
702 if (params->stop_total_us) {
703 retval = osnoise_set_stop_total_us(tool->context, params->stop_total_us);
704 if (retval) {
705 err_msg("Failed to set stop total us\n");
706 goto out_err;
707 }
708 }
709
710 if (params->threshold) {
711 retval = osnoise_set_tracing_thresh(tool->context, params->threshold);
712 if (retval) {
713 err_msg("Failed to set tracing_thresh\n");
714 goto out_err;
715 }
716 }
717
718 return 0;
719
720out_err:
721 return -1;
722}
723
724/*
725 * osnoise_init_hist - initialize a osnoise hist tool with parameters
726 */
727static struct osnoise_tool
728*osnoise_init_hist(struct osnoise_hist_params *params)
729{
730 struct osnoise_tool *tool;
731 int nr_cpus;
732
733 nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
734
735 tool = osnoise_init_tool("osnoise_hist");
736 if (!tool)
737 return NULL;
738
739 tool->data = osnoise_alloc_histogram(nr_cpus, params->entries, params->bucket_size);
740 if (!tool->data)
741 goto out_err;
742
743 tool->params = params;
744
745 return tool;
746
747out_err:
748 osnoise_destroy_tool(tool);
749 return NULL;
750}
751
752static int stop_tracing;
753static void stop_hist(int sig)
754{
755 stop_tracing = 1;
756}
757
758/*
759 * osnoise_hist_set_signals - handles the signal to stop the tool
760 */
761static void
762osnoise_hist_set_signals(struct osnoise_hist_params *params)
763{
764 signal(SIGINT, stop_hist);
765 if (params->duration) {
766 signal(SIGALRM, stop_hist);
767 alarm(params->duration);
768 }
769}
770
771int osnoise_hist_main(int argc, char *argv[])
772{
773 struct osnoise_hist_params *params;
774 struct osnoise_tool *record = NULL;
775 struct osnoise_tool *tool = NULL;
776 struct trace_instance *trace;
777 int return_value = 1;
778 int retval;
779
780 params = osnoise_hist_parse_args(argc, argv);
781 if (!params)
782 exit(1);
783
784 tool = osnoise_init_hist(params);
785 if (!tool) {
786 err_msg("Could not init osnoise hist\n");
787 goto out_exit;
788 }
789
790 retval = osnoise_hist_apply_config(tool, params);
791 if (retval) {
792 err_msg("Could not apply config\n");
793 goto out_destroy;
794 }
795
796 trace = &tool->trace;
797
798 retval = enable_osnoise(trace);
799 if (retval) {
800 err_msg("Failed to enable osnoise tracer\n");
801 goto out_destroy;
802 }
803
804 retval = osnoise_init_trace_hist(tool);
805 if (retval)
806 goto out_destroy;
807
808 if (params->set_sched) {
809 retval = set_comm_sched_attr("osnoise/", ¶ms->sched_param);
810 if (retval) {
811 err_msg("Failed to set sched parameters\n");
812 goto out_free;
813 }
814 }
815
816 trace_instance_start(trace);
817
818 if (params->trace_output) {
819 record = osnoise_init_trace_tool("osnoise");
820 if (!record) {
821 err_msg("Failed to enable the trace instance\n");
822 goto out_free;
823 }
824
825 if (params->events) {
826 retval = trace_events_enable(&record->trace, params->events);
827 if (retval)
828 goto out_hist;
829 }
830
831 trace_instance_start(&record->trace);
832 }
833
834 tool->start_time = time(NULL);
835 osnoise_hist_set_signals(params);
836
837 while (!stop_tracing) {
838 sleep(params->sleep_time);
839
840 retval = tracefs_iterate_raw_events(trace->tep,
841 trace->inst,
842 NULL,
843 0,
844 collect_registered_events,
845 trace);
846 if (retval < 0) {
847 err_msg("Error iterating on events\n");
848 goto out_hist;
849 }
850
851 if (trace_is_off(&tool->trace, &record->trace))
852 break;
853 }
854
855 osnoise_read_trace_hist(tool);
856
857 osnoise_print_stats(params, tool);
858
859 return_value = 0;
860
861 if (trace_is_off(&tool->trace, &record->trace)) {
862 printf("rtla osnoise hit stop tracing\n");
863 if (params->trace_output) {
864 printf(" Saving trace to %s\n", params->trace_output);
865 save_trace_to_file(record->trace.inst, params->trace_output);
866 }
867 }
868
869out_hist:
870 trace_events_destroy(&record->trace, params->events);
871 params->events = NULL;
872out_free:
873 osnoise_free_histogram(tool->data);
874out_destroy:
875 osnoise_destroy_tool(record);
876 osnoise_destroy_tool(tool);
877 free(params);
878out_exit:
879 exit(return_value);
880}