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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 <stdio.h>
12#include <time.h>
13
14#include "utils.h"
15#include "osnoise.h"
16#include "timerlat.h"
17
18struct timerlat_hist_params {
19 char *cpus;
20 char *monitored_cpus;
21 char *trace_output;
22 unsigned long long runtime;
23 long long stop_us;
24 long long stop_total_us;
25 long long timerlat_period_us;
26 long long print_stack;
27 int sleep_time;
28 int output_divisor;
29 int duration;
30 int set_sched;
31 int dma_latency;
32 struct sched_attr sched_param;
33 struct trace_events *events;
34
35 char no_irq;
36 char no_thread;
37 char no_header;
38 char no_summary;
39 char no_index;
40 char with_zeros;
41 int bucket_size;
42 int entries;
43};
44
45struct timerlat_hist_cpu {
46 int *irq;
47 int *thread;
48
49 int irq_count;
50 int thread_count;
51
52 unsigned long long min_irq;
53 unsigned long long sum_irq;
54 unsigned long long max_irq;
55
56 unsigned long long min_thread;
57 unsigned long long sum_thread;
58 unsigned long long max_thread;
59};
60
61struct timerlat_hist_data {
62 struct timerlat_hist_cpu *hist;
63 int entries;
64 int bucket_size;
65 int nr_cpus;
66};
67
68/*
69 * timerlat_free_histogram - free runtime data
70 */
71static void
72timerlat_free_histogram(struct timerlat_hist_data *data)
73{
74 int cpu;
75
76 /* one histogram for IRQ and one for thread, per CPU */
77 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
78 if (data->hist[cpu].irq)
79 free(data->hist[cpu].irq);
80
81 if (data->hist[cpu].thread)
82 free(data->hist[cpu].thread);
83 }
84
85 /* one set of histograms per CPU */
86 if (data->hist)
87 free(data->hist);
88
89 free(data);
90}
91
92/*
93 * timerlat_alloc_histogram - alloc runtime data
94 */
95static struct timerlat_hist_data
96*timerlat_alloc_histogram(int nr_cpus, int entries, int bucket_size)
97{
98 struct timerlat_hist_data *data;
99 int cpu;
100
101 data = calloc(1, sizeof(*data));
102 if (!data)
103 return NULL;
104
105 data->entries = entries;
106 data->bucket_size = bucket_size;
107 data->nr_cpus = nr_cpus;
108
109 /* one set of histograms per CPU */
110 data->hist = calloc(1, sizeof(*data->hist) * nr_cpus);
111 if (!data->hist)
112 goto cleanup;
113
114 /* one histogram for IRQ and one for thread, per cpu */
115 for (cpu = 0; cpu < nr_cpus; cpu++) {
116 data->hist[cpu].irq = calloc(1, sizeof(*data->hist->irq) * (entries + 1));
117 if (!data->hist[cpu].irq)
118 goto cleanup;
119 data->hist[cpu].thread = calloc(1, sizeof(*data->hist->thread) * (entries + 1));
120 if (!data->hist[cpu].thread)
121 goto cleanup;
122 }
123
124 /* set the min to max */
125 for (cpu = 0; cpu < nr_cpus; cpu++) {
126 data->hist[cpu].min_irq = ~0;
127 data->hist[cpu].min_thread = ~0;
128 }
129
130 return data;
131
132cleanup:
133 timerlat_free_histogram(data);
134 return NULL;
135}
136
137/*
138 * timerlat_hist_update - record a new timerlat occurent on cpu, updating data
139 */
140static void
141timerlat_hist_update(struct osnoise_tool *tool, int cpu,
142 unsigned long long thread,
143 unsigned long long latency)
144{
145 struct timerlat_hist_params *params = tool->params;
146 struct timerlat_hist_data *data = tool->data;
147 int entries = data->entries;
148 int bucket;
149 int *hist;
150
151 if (params->output_divisor)
152 latency = latency / params->output_divisor;
153
154 if (data->bucket_size)
155 bucket = latency / data->bucket_size;
156
157 if (!thread) {
158 hist = data->hist[cpu].irq;
159 data->hist[cpu].irq_count++;
160 update_min(&data->hist[cpu].min_irq, &latency);
161 update_sum(&data->hist[cpu].sum_irq, &latency);
162 update_max(&data->hist[cpu].max_irq, &latency);
163 } else {
164 hist = data->hist[cpu].thread;
165 data->hist[cpu].thread_count++;
166 update_min(&data->hist[cpu].min_thread, &latency);
167 update_sum(&data->hist[cpu].sum_thread, &latency);
168 update_max(&data->hist[cpu].max_thread, &latency);
169 }
170
171 if (bucket < entries)
172 hist[bucket]++;
173 else
174 hist[entries]++;
175}
176
177/*
178 * timerlat_hist_handler - this is the handler for timerlat tracer events
179 */
180static int
181timerlat_hist_handler(struct trace_seq *s, struct tep_record *record,
182 struct tep_event *event, void *data)
183{
184 struct trace_instance *trace = data;
185 unsigned long long thread, latency;
186 struct osnoise_tool *tool;
187 int cpu = record->cpu;
188
189 tool = container_of(trace, struct osnoise_tool, trace);
190
191 tep_get_field_val(s, event, "context", record, &thread, 1);
192 tep_get_field_val(s, event, "timer_latency", record, &latency, 1);
193
194 timerlat_hist_update(tool, cpu, thread, latency);
195
196 return 0;
197}
198
199/*
200 * timerlat_hist_header - print the header of the tracer to the output
201 */
202static void timerlat_hist_header(struct osnoise_tool *tool)
203{
204 struct timerlat_hist_params *params = tool->params;
205 struct timerlat_hist_data *data = tool->data;
206 struct trace_seq *s = tool->trace.seq;
207 char duration[26];
208 int cpu;
209
210 if (params->no_header)
211 return;
212
213 get_duration(tool->start_time, duration, sizeof(duration));
214 trace_seq_printf(s, "# RTLA timerlat histogram\n");
215 trace_seq_printf(s, "# Time unit is %s (%s)\n",
216 params->output_divisor == 1 ? "nanoseconds" : "microseconds",
217 params->output_divisor == 1 ? "ns" : "us");
218
219 trace_seq_printf(s, "# Duration: %s\n", duration);
220
221 if (!params->no_index)
222 trace_seq_printf(s, "Index");
223
224 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
225 if (params->cpus && !params->monitored_cpus[cpu])
226 continue;
227
228 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
229 continue;
230
231 if (!params->no_irq)
232 trace_seq_printf(s, " IRQ-%03d", cpu);
233
234 if (!params->no_thread)
235 trace_seq_printf(s, " Thr-%03d", cpu);
236 }
237 trace_seq_printf(s, "\n");
238
239
240 trace_seq_do_printf(s);
241 trace_seq_reset(s);
242}
243
244/*
245 * timerlat_print_summary - print the summary of the hist data to the output
246 */
247static void
248timerlat_print_summary(struct timerlat_hist_params *params,
249 struct trace_instance *trace,
250 struct timerlat_hist_data *data)
251{
252 int cpu;
253
254 if (params->no_summary)
255 return;
256
257 if (!params->no_index)
258 trace_seq_printf(trace->seq, "count:");
259
260 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
261 if (params->cpus && !params->monitored_cpus[cpu])
262 continue;
263
264 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
265 continue;
266
267 if (!params->no_irq)
268 trace_seq_printf(trace->seq, "%9d ",
269 data->hist[cpu].irq_count);
270
271 if (!params->no_thread)
272 trace_seq_printf(trace->seq, "%9d ",
273 data->hist[cpu].thread_count);
274 }
275 trace_seq_printf(trace->seq, "\n");
276
277 if (!params->no_index)
278 trace_seq_printf(trace->seq, "min: ");
279
280 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
281 if (params->cpus && !params->monitored_cpus[cpu])
282 continue;
283
284 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
285 continue;
286
287 if (!params->no_irq)
288 trace_seq_printf(trace->seq, "%9llu ",
289 data->hist[cpu].min_irq);
290
291 if (!params->no_thread)
292 trace_seq_printf(trace->seq, "%9llu ",
293 data->hist[cpu].min_thread);
294 }
295 trace_seq_printf(trace->seq, "\n");
296
297 if (!params->no_index)
298 trace_seq_printf(trace->seq, "avg: ");
299
300 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
301 if (params->cpus && !params->monitored_cpus[cpu])
302 continue;
303
304 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
305 continue;
306
307 if (!params->no_irq) {
308 if (data->hist[cpu].irq_count)
309 trace_seq_printf(trace->seq, "%9llu ",
310 data->hist[cpu].sum_irq / data->hist[cpu].irq_count);
311 else
312 trace_seq_printf(trace->seq, " - ");
313 }
314
315 if (!params->no_thread) {
316 if (data->hist[cpu].thread_count)
317 trace_seq_printf(trace->seq, "%9llu ",
318 data->hist[cpu].sum_thread / data->hist[cpu].thread_count);
319 else
320 trace_seq_printf(trace->seq, " - ");
321 }
322 }
323 trace_seq_printf(trace->seq, "\n");
324
325 if (!params->no_index)
326 trace_seq_printf(trace->seq, "max: ");
327
328 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
329 if (params->cpus && !params->monitored_cpus[cpu])
330 continue;
331
332 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
333 continue;
334
335 if (!params->no_irq)
336 trace_seq_printf(trace->seq, "%9llu ",
337 data->hist[cpu].max_irq);
338
339 if (!params->no_thread)
340 trace_seq_printf(trace->seq, "%9llu ",
341 data->hist[cpu].max_thread);
342 }
343 trace_seq_printf(trace->seq, "\n");
344 trace_seq_do_printf(trace->seq);
345 trace_seq_reset(trace->seq);
346}
347
348/*
349 * timerlat_print_stats - print data for all CPUs
350 */
351static void
352timerlat_print_stats(struct timerlat_hist_params *params, struct osnoise_tool *tool)
353{
354 struct timerlat_hist_data *data = tool->data;
355 struct trace_instance *trace = &tool->trace;
356 int bucket, cpu;
357 int total;
358
359 timerlat_hist_header(tool);
360
361 for (bucket = 0; bucket < data->entries; bucket++) {
362 total = 0;
363
364 if (!params->no_index)
365 trace_seq_printf(trace->seq, "%-6d",
366 bucket * data->bucket_size);
367
368 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
369 if (params->cpus && !params->monitored_cpus[cpu])
370 continue;
371
372 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
373 continue;
374
375 if (!params->no_irq) {
376 total += data->hist[cpu].irq[bucket];
377 trace_seq_printf(trace->seq, "%9d ",
378 data->hist[cpu].irq[bucket]);
379 }
380
381 if (!params->no_thread) {
382 total += data->hist[cpu].thread[bucket];
383 trace_seq_printf(trace->seq, "%9d ",
384 data->hist[cpu].thread[bucket]);
385 }
386
387 }
388
389 if (total == 0 && !params->with_zeros) {
390 trace_seq_reset(trace->seq);
391 continue;
392 }
393
394 trace_seq_printf(trace->seq, "\n");
395 trace_seq_do_printf(trace->seq);
396 trace_seq_reset(trace->seq);
397 }
398
399 if (!params->no_index)
400 trace_seq_printf(trace->seq, "over: ");
401
402 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
403 if (params->cpus && !params->monitored_cpus[cpu])
404 continue;
405
406 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
407 continue;
408
409 if (!params->no_irq)
410 trace_seq_printf(trace->seq, "%9d ",
411 data->hist[cpu].irq[data->entries]);
412
413 if (!params->no_thread)
414 trace_seq_printf(trace->seq, "%9d ",
415 data->hist[cpu].thread[data->entries]);
416 }
417 trace_seq_printf(trace->seq, "\n");
418 trace_seq_do_printf(trace->seq);
419 trace_seq_reset(trace->seq);
420
421 timerlat_print_summary(params, trace, data);
422}
423
424/*
425 * timerlat_hist_usage - prints timerlat top usage message
426 */
427static void timerlat_hist_usage(char *usage)
428{
429 int i;
430
431 char *msg[] = {
432 "",
433 " usage: [rtla] timerlat hist [-h] [-q] [-d s] [-D] [-n] [-a us] [-p us] [-i us] [-T us] [-s us] \\",
434 " [-t[=file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] [-c cpu-list] \\",
435 " [-P priority] [-E N] [-b N] [--no-irq] [--no-thread] [--no-header] [--no-summary] \\",
436 " [--no-index] [--with-zeros] [--dma-latency us]",
437 "",
438 " -h/--help: print this menu",
439 " -a/--auto: set automatic trace mode, stopping the session if argument in us latency is hit",
440 " -p/--period us: timerlat period in us",
441 " -i/--irq us: stop trace if the irq latency is higher than the argument in us",
442 " -T/--thread us: stop trace if the thread latency is higher than the argument in us",
443 " -s/--stack us: save the stack trace at the IRQ if a thread latency is higher than the argument in us",
444 " -c/--cpus cpus: run the tracer only on the given cpus",
445 " -d/--duration time[m|h|d]: duration of the session in seconds",
446 " -D/--debug: print debug info",
447 " -t/--trace[=file]: save the stopped trace to [file|timerlat_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 " -n/--nano: display data in nanoseconds",
452 " -b/--bucket-size N: set the histogram bucket size (default 1)",
453 " -E/--entries N: set the number of entries of the histogram (default 256)",
454 " --no-irq: ignore IRQ latencies",
455 " --no-thread: ignore thread latencies",
456 " --no-header: do not print header",
457 " --no-summary: do not print summary",
458 " --no-index: do not print index",
459 " --with-zeros: print zero only entries",
460 " --dma-latency us: set /dev/cpu_dma_latency latency <us> to reduce exit from idle latency",
461 " -P/--priority o:prio|r:prio|f:prio|d:runtime:period : set scheduling parameters",
462 " o:prio - use SCHED_OTHER with prio",
463 " r:prio - use SCHED_RR with prio",
464 " f:prio - use SCHED_FIFO with prio",
465 " d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period",
466 " in nanoseconds",
467 NULL,
468 };
469
470 if (usage)
471 fprintf(stderr, "%s\n", usage);
472
473 fprintf(stderr, "rtla timerlat hist: a per-cpu histogram of the timer latency (version %s)\n",
474 VERSION);
475
476 for (i = 0; msg[i]; i++)
477 fprintf(stderr, "%s\n", msg[i]);
478 exit(1);
479}
480
481/*
482 * timerlat_hist_parse_args - allocs, parse and fill the cmd line parameters
483 */
484static struct timerlat_hist_params
485*timerlat_hist_parse_args(int argc, char *argv[])
486{
487 struct timerlat_hist_params *params;
488 struct trace_events *tevent;
489 int auto_thresh;
490 int retval;
491 int c;
492
493 params = calloc(1, sizeof(*params));
494 if (!params)
495 exit(1);
496
497 /* disabled by default */
498 params->dma_latency = -1;
499
500 /* display data in microseconds */
501 params->output_divisor = 1000;
502 params->bucket_size = 1;
503 params->entries = 256;
504
505 while (1) {
506 static struct option long_options[] = {
507 {"auto", required_argument, 0, 'a'},
508 {"cpus", required_argument, 0, 'c'},
509 {"bucket-size", required_argument, 0, 'b'},
510 {"debug", no_argument, 0, 'D'},
511 {"entries", required_argument, 0, 'E'},
512 {"duration", required_argument, 0, 'd'},
513 {"help", no_argument, 0, 'h'},
514 {"irq", required_argument, 0, 'i'},
515 {"nano", no_argument, 0, 'n'},
516 {"period", required_argument, 0, 'p'},
517 {"priority", required_argument, 0, 'P'},
518 {"stack", required_argument, 0, 's'},
519 {"thread", required_argument, 0, 'T'},
520 {"trace", optional_argument, 0, 't'},
521 {"event", required_argument, 0, 'e'},
522 {"no-irq", no_argument, 0, '0'},
523 {"no-thread", no_argument, 0, '1'},
524 {"no-header", no_argument, 0, '2'},
525 {"no-summary", no_argument, 0, '3'},
526 {"no-index", no_argument, 0, '4'},
527 {"with-zeros", no_argument, 0, '5'},
528 {"trigger", required_argument, 0, '6'},
529 {"filter", required_argument, 0, '7'},
530 {"dma-latency", required_argument, 0, '8'},
531 {0, 0, 0, 0}
532 };
533
534 /* getopt_long stores the option index here. */
535 int option_index = 0;
536
537 c = getopt_long(argc, argv, "a:c:b:d:e:E:Dhi:np:P:s:t::T:0123456:7:8:",
538 long_options, &option_index);
539
540 /* detect the end of the options. */
541 if (c == -1)
542 break;
543
544 switch (c) {
545 case 'a':
546 auto_thresh = get_llong_from_str(optarg);
547
548 /* set thread stop to auto_thresh */
549 params->stop_total_us = auto_thresh;
550
551 /* get stack trace */
552 params->print_stack = auto_thresh;
553
554 /* set trace */
555 params->trace_output = "timerlat_trace.txt";
556
557 break;
558 case 'c':
559 retval = parse_cpu_list(optarg, ¶ms->monitored_cpus);
560 if (retval)
561 timerlat_hist_usage("\nInvalid -c cpu list\n");
562 params->cpus = optarg;
563 break;
564 case 'b':
565 params->bucket_size = get_llong_from_str(optarg);
566 if ((params->bucket_size == 0) || (params->bucket_size >= 1000000))
567 timerlat_hist_usage("Bucket size needs to be > 0 and <= 1000000\n");
568 break;
569 case 'D':
570 config_debug = 1;
571 break;
572 case 'd':
573 params->duration = parse_seconds_duration(optarg);
574 if (!params->duration)
575 timerlat_hist_usage("Invalid -D duration\n");
576 break;
577 case 'e':
578 tevent = trace_event_alloc(optarg);
579 if (!tevent) {
580 err_msg("Error alloc trace event");
581 exit(EXIT_FAILURE);
582 }
583
584 if (params->events)
585 tevent->next = params->events;
586
587 params->events = tevent;
588 break;
589 case 'E':
590 params->entries = get_llong_from_str(optarg);
591 if ((params->entries < 10) || (params->entries > 9999999))
592 timerlat_hist_usage("Entries must be > 10 and < 9999999\n");
593 break;
594 case 'h':
595 case '?':
596 timerlat_hist_usage(NULL);
597 break;
598 case 'i':
599 params->stop_us = get_llong_from_str(optarg);
600 break;
601 case 'n':
602 params->output_divisor = 1;
603 break;
604 case 'p':
605 params->timerlat_period_us = get_llong_from_str(optarg);
606 if (params->timerlat_period_us > 1000000)
607 timerlat_hist_usage("Period longer than 1 s\n");
608 break;
609 case 'P':
610 retval = parse_prio(optarg, ¶ms->sched_param);
611 if (retval == -1)
612 timerlat_hist_usage("Invalid -P priority");
613 params->set_sched = 1;
614 break;
615 case 's':
616 params->print_stack = get_llong_from_str(optarg);
617 break;
618 case 'T':
619 params->stop_total_us = get_llong_from_str(optarg);
620 break;
621 case 't':
622 if (optarg)
623 /* skip = */
624 params->trace_output = &optarg[1];
625 else
626 params->trace_output = "timerlat_trace.txt";
627 break;
628 case '0': /* no irq */
629 params->no_irq = 1;
630 break;
631 case '1': /* no thread */
632 params->no_thread = 1;
633 break;
634 case '2': /* no header */
635 params->no_header = 1;
636 break;
637 case '3': /* no summary */
638 params->no_summary = 1;
639 break;
640 case '4': /* no index */
641 params->no_index = 1;
642 break;
643 case '5': /* with zeros */
644 params->with_zeros = 1;
645 break;
646 case '6': /* trigger */
647 if (params->events) {
648 retval = trace_event_add_trigger(params->events, optarg);
649 if (retval) {
650 err_msg("Error adding trigger %s\n", optarg);
651 exit(EXIT_FAILURE);
652 }
653 } else {
654 timerlat_hist_usage("--trigger requires a previous -e\n");
655 }
656 break;
657 case '7': /* filter */
658 if (params->events) {
659 retval = trace_event_add_filter(params->events, optarg);
660 if (retval) {
661 err_msg("Error adding filter %s\n", optarg);
662 exit(EXIT_FAILURE);
663 }
664 } else {
665 timerlat_hist_usage("--filter requires a previous -e\n");
666 }
667 break;
668 case '8':
669 params->dma_latency = get_llong_from_str(optarg);
670 if (params->dma_latency < 0 || params->dma_latency > 10000) {
671 err_msg("--dma-latency needs to be >= 0 and < 10000");
672 exit(EXIT_FAILURE);
673 }
674 break;
675 default:
676 timerlat_hist_usage("Invalid option");
677 }
678 }
679
680 if (geteuid()) {
681 err_msg("rtla needs root permission\n");
682 exit(EXIT_FAILURE);
683 }
684
685 if (params->no_irq && params->no_thread)
686 timerlat_hist_usage("no-irq and no-thread set, there is nothing to do here");
687
688 if (params->no_index && !params->with_zeros)
689 timerlat_hist_usage("no-index set with with-zeros is not set - it does not make sense");
690
691 return params;
692}
693
694/*
695 * timerlat_hist_apply_config - apply the hist configs to the initialized tool
696 */
697static int
698timerlat_hist_apply_config(struct osnoise_tool *tool, struct timerlat_hist_params *params)
699{
700 int retval;
701
702 if (!params->sleep_time)
703 params->sleep_time = 1;
704
705 if (params->cpus) {
706 retval = osnoise_set_cpus(tool->context, params->cpus);
707 if (retval) {
708 err_msg("Failed to apply CPUs config\n");
709 goto out_err;
710 }
711 }
712
713 if (params->stop_us) {
714 retval = osnoise_set_stop_us(tool->context, params->stop_us);
715 if (retval) {
716 err_msg("Failed to set stop us\n");
717 goto out_err;
718 }
719 }
720
721 if (params->stop_total_us) {
722 retval = osnoise_set_stop_total_us(tool->context, params->stop_total_us);
723 if (retval) {
724 err_msg("Failed to set stop total us\n");
725 goto out_err;
726 }
727 }
728
729 if (params->timerlat_period_us) {
730 retval = osnoise_set_timerlat_period_us(tool->context, params->timerlat_period_us);
731 if (retval) {
732 err_msg("Failed to set timerlat period\n");
733 goto out_err;
734 }
735 }
736
737 if (params->print_stack) {
738 retval = osnoise_set_print_stack(tool->context, params->print_stack);
739 if (retval) {
740 err_msg("Failed to set print stack\n");
741 goto out_err;
742 }
743 }
744
745 return 0;
746
747out_err:
748 return -1;
749}
750
751/*
752 * timerlat_init_hist - initialize a timerlat hist tool with parameters
753 */
754static struct osnoise_tool
755*timerlat_init_hist(struct timerlat_hist_params *params)
756{
757 struct osnoise_tool *tool;
758 int nr_cpus;
759
760 nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
761
762 tool = osnoise_init_tool("timerlat_hist");
763 if (!tool)
764 return NULL;
765
766 tool->data = timerlat_alloc_histogram(nr_cpus, params->entries, params->bucket_size);
767 if (!tool->data)
768 goto out_err;
769
770 tool->params = params;
771
772 tep_register_event_handler(tool->trace.tep, -1, "ftrace", "timerlat",
773 timerlat_hist_handler, tool);
774
775 return tool;
776
777out_err:
778 osnoise_destroy_tool(tool);
779 return NULL;
780}
781
782static int stop_tracing;
783static void stop_hist(int sig)
784{
785 stop_tracing = 1;
786}
787
788/*
789 * timerlat_hist_set_signals - handles the signal to stop the tool
790 */
791static void
792timerlat_hist_set_signals(struct timerlat_hist_params *params)
793{
794 signal(SIGINT, stop_hist);
795 if (params->duration) {
796 signal(SIGALRM, stop_hist);
797 alarm(params->duration);
798 }
799}
800
801int timerlat_hist_main(int argc, char *argv[])
802{
803 struct timerlat_hist_params *params;
804 struct osnoise_tool *record = NULL;
805 struct osnoise_tool *tool = NULL;
806 struct trace_instance *trace;
807 int dma_latency_fd = -1;
808 int return_value = 1;
809 int retval;
810
811 params = timerlat_hist_parse_args(argc, argv);
812 if (!params)
813 exit(1);
814
815 tool = timerlat_init_hist(params);
816 if (!tool) {
817 err_msg("Could not init osnoise hist\n");
818 goto out_exit;
819 }
820
821 retval = timerlat_hist_apply_config(tool, params);
822 if (retval) {
823 err_msg("Could not apply config\n");
824 goto out_free;
825 }
826
827 trace = &tool->trace;
828
829 retval = enable_timerlat(trace);
830 if (retval) {
831 err_msg("Failed to enable timerlat tracer\n");
832 goto out_free;
833 }
834
835 if (params->set_sched) {
836 retval = set_comm_sched_attr("timerlat/", ¶ms->sched_param);
837 if (retval) {
838 err_msg("Failed to set sched parameters\n");
839 goto out_free;
840 }
841 }
842
843 if (params->dma_latency >= 0) {
844 dma_latency_fd = set_cpu_dma_latency(params->dma_latency);
845 if (dma_latency_fd < 0) {
846 err_msg("Could not set /dev/cpu_dma_latency.\n");
847 goto out_free;
848 }
849 }
850
851 trace_instance_start(trace);
852
853 if (params->trace_output) {
854 record = osnoise_init_trace_tool("timerlat");
855 if (!record) {
856 err_msg("Failed to enable the trace instance\n");
857 goto out_free;
858 }
859
860 if (params->events) {
861 retval = trace_events_enable(&record->trace, params->events);
862 if (retval)
863 goto out_hist;
864 }
865
866 trace_instance_start(&record->trace);
867 }
868
869 tool->start_time = time(NULL);
870 timerlat_hist_set_signals(params);
871
872 while (!stop_tracing) {
873 sleep(params->sleep_time);
874
875 retval = tracefs_iterate_raw_events(trace->tep,
876 trace->inst,
877 NULL,
878 0,
879 collect_registered_events,
880 trace);
881 if (retval < 0) {
882 err_msg("Error iterating on events\n");
883 goto out_hist;
884 }
885
886 if (trace_is_off(&tool->trace, &record->trace))
887 break;
888 }
889
890 timerlat_print_stats(params, tool);
891
892 return_value = 0;
893
894 if (trace_is_off(&tool->trace, &record->trace)) {
895 printf("rtla timerlat hit stop tracing\n");
896 if (params->trace_output) {
897 printf(" Saving trace to %s\n", params->trace_output);
898 save_trace_to_file(record->trace.inst, params->trace_output);
899 }
900 }
901
902out_hist:
903 if (dma_latency_fd >= 0)
904 close(dma_latency_fd);
905 trace_events_destroy(&record->trace, params->events);
906 params->events = NULL;
907out_free:
908 timerlat_free_histogram(tool->data);
909 osnoise_destroy_tool(record);
910 osnoise_destroy_tool(tool);
911 free(params);
912out_exit:
913 exit(return_value);
914}
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#include <pthread.h>
16
17#include "utils.h"
18#include "osnoise.h"
19#include "timerlat.h"
20#include "timerlat_aa.h"
21#include "timerlat_u.h"
22
23struct timerlat_hist_params {
24 char *cpus;
25 cpu_set_t monitored_cpus;
26 char *trace_output;
27 char *cgroup_name;
28 unsigned long long runtime;
29 long long stop_us;
30 long long stop_total_us;
31 long long timerlat_period_us;
32 long long print_stack;
33 int sleep_time;
34 int output_divisor;
35 int duration;
36 int set_sched;
37 int dma_latency;
38 int cgroup;
39 int hk_cpus;
40 int no_aa;
41 int dump_tasks;
42 int user_workload;
43 int kernel_workload;
44 int user_hist;
45 cpu_set_t hk_cpu_set;
46 struct sched_attr sched_param;
47 struct trace_events *events;
48 char no_irq;
49 char no_thread;
50 char no_header;
51 char no_summary;
52 char no_index;
53 char with_zeros;
54 int bucket_size;
55 int entries;
56 int warmup;
57 int buffer_size;
58 int deepest_idle_state;
59};
60
61struct timerlat_hist_cpu {
62 int *irq;
63 int *thread;
64 int *user;
65
66 unsigned long long irq_count;
67 unsigned long long thread_count;
68 unsigned long long user_count;
69
70 unsigned long long min_irq;
71 unsigned long long sum_irq;
72 unsigned long long max_irq;
73
74 unsigned long long min_thread;
75 unsigned long long sum_thread;
76 unsigned long long max_thread;
77
78 unsigned long long min_user;
79 unsigned long long sum_user;
80 unsigned long long max_user;
81};
82
83struct timerlat_hist_data {
84 struct timerlat_hist_cpu *hist;
85 int entries;
86 int bucket_size;
87 int nr_cpus;
88};
89
90/*
91 * timerlat_free_histogram - free runtime data
92 */
93static void
94timerlat_free_histogram(struct timerlat_hist_data *data)
95{
96 int cpu;
97
98 /* one histogram for IRQ and one for thread, per CPU */
99 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
100 if (data->hist[cpu].irq)
101 free(data->hist[cpu].irq);
102
103 if (data->hist[cpu].thread)
104 free(data->hist[cpu].thread);
105
106 if (data->hist[cpu].user)
107 free(data->hist[cpu].user);
108
109 }
110
111 /* one set of histograms per CPU */
112 if (data->hist)
113 free(data->hist);
114
115 free(data);
116}
117
118/*
119 * timerlat_alloc_histogram - alloc runtime data
120 */
121static struct timerlat_hist_data
122*timerlat_alloc_histogram(int nr_cpus, int entries, int bucket_size)
123{
124 struct timerlat_hist_data *data;
125 int cpu;
126
127 data = calloc(1, sizeof(*data));
128 if (!data)
129 return NULL;
130
131 data->entries = entries;
132 data->bucket_size = bucket_size;
133 data->nr_cpus = nr_cpus;
134
135 /* one set of histograms per CPU */
136 data->hist = calloc(1, sizeof(*data->hist) * nr_cpus);
137 if (!data->hist)
138 goto cleanup;
139
140 /* one histogram for IRQ and one for thread, per cpu */
141 for (cpu = 0; cpu < nr_cpus; cpu++) {
142 data->hist[cpu].irq = calloc(1, sizeof(*data->hist->irq) * (entries + 1));
143 if (!data->hist[cpu].irq)
144 goto cleanup;
145
146 data->hist[cpu].thread = calloc(1, sizeof(*data->hist->thread) * (entries + 1));
147 if (!data->hist[cpu].thread)
148 goto cleanup;
149
150 data->hist[cpu].user = calloc(1, sizeof(*data->hist->user) * (entries + 1));
151 if (!data->hist[cpu].user)
152 goto cleanup;
153 }
154
155 /* set the min to max */
156 for (cpu = 0; cpu < nr_cpus; cpu++) {
157 data->hist[cpu].min_irq = ~0;
158 data->hist[cpu].min_thread = ~0;
159 data->hist[cpu].min_user = ~0;
160 }
161
162 return data;
163
164cleanup:
165 timerlat_free_histogram(data);
166 return NULL;
167}
168
169/*
170 * timerlat_hist_update - record a new timerlat occurent on cpu, updating data
171 */
172static void
173timerlat_hist_update(struct osnoise_tool *tool, int cpu,
174 unsigned long long context,
175 unsigned long long latency)
176{
177 struct timerlat_hist_params *params = tool->params;
178 struct timerlat_hist_data *data = tool->data;
179 int entries = data->entries;
180 int bucket;
181 int *hist;
182
183 if (params->output_divisor)
184 latency = latency / params->output_divisor;
185
186 bucket = latency / data->bucket_size;
187
188 if (!context) {
189 hist = data->hist[cpu].irq;
190 data->hist[cpu].irq_count++;
191 update_min(&data->hist[cpu].min_irq, &latency);
192 update_sum(&data->hist[cpu].sum_irq, &latency);
193 update_max(&data->hist[cpu].max_irq, &latency);
194 } else if (context == 1) {
195 hist = data->hist[cpu].thread;
196 data->hist[cpu].thread_count++;
197 update_min(&data->hist[cpu].min_thread, &latency);
198 update_sum(&data->hist[cpu].sum_thread, &latency);
199 update_max(&data->hist[cpu].max_thread, &latency);
200 } else { /* user */
201 hist = data->hist[cpu].user;
202 data->hist[cpu].user_count++;
203 update_min(&data->hist[cpu].min_user, &latency);
204 update_sum(&data->hist[cpu].sum_user, &latency);
205 update_max(&data->hist[cpu].max_user, &latency);
206 }
207
208 if (bucket < entries)
209 hist[bucket]++;
210 else
211 hist[entries]++;
212}
213
214/*
215 * timerlat_hist_handler - this is the handler for timerlat tracer events
216 */
217static int
218timerlat_hist_handler(struct trace_seq *s, struct tep_record *record,
219 struct tep_event *event, void *data)
220{
221 struct trace_instance *trace = data;
222 unsigned long long context, latency;
223 struct osnoise_tool *tool;
224 int cpu = record->cpu;
225
226 tool = container_of(trace, struct osnoise_tool, trace);
227
228 tep_get_field_val(s, event, "context", record, &context, 1);
229 tep_get_field_val(s, event, "timer_latency", record, &latency, 1);
230
231 timerlat_hist_update(tool, cpu, context, latency);
232
233 return 0;
234}
235
236/*
237 * timerlat_hist_header - print the header of the tracer to the output
238 */
239static void timerlat_hist_header(struct osnoise_tool *tool)
240{
241 struct timerlat_hist_params *params = tool->params;
242 struct timerlat_hist_data *data = tool->data;
243 struct trace_seq *s = tool->trace.seq;
244 char duration[26];
245 int cpu;
246
247 if (params->no_header)
248 return;
249
250 get_duration(tool->start_time, duration, sizeof(duration));
251 trace_seq_printf(s, "# RTLA timerlat histogram\n");
252 trace_seq_printf(s, "# Time unit is %s (%s)\n",
253 params->output_divisor == 1 ? "nanoseconds" : "microseconds",
254 params->output_divisor == 1 ? "ns" : "us");
255
256 trace_seq_printf(s, "# Duration: %s\n", duration);
257
258 if (!params->no_index)
259 trace_seq_printf(s, "Index");
260
261 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
262 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus))
263 continue;
264
265 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
266 continue;
267
268 if (!params->no_irq)
269 trace_seq_printf(s, " IRQ-%03d", cpu);
270
271 if (!params->no_thread)
272 trace_seq_printf(s, " Thr-%03d", cpu);
273
274 if (params->user_hist)
275 trace_seq_printf(s, " Usr-%03d", cpu);
276 }
277 trace_seq_printf(s, "\n");
278
279
280 trace_seq_do_printf(s);
281 trace_seq_reset(s);
282}
283
284/*
285 * format_summary_value - format a line of summary value (min, max or avg)
286 * of hist data
287 */
288static void format_summary_value(struct trace_seq *seq,
289 int count,
290 unsigned long long val,
291 bool avg)
292{
293 if (count)
294 trace_seq_printf(seq, "%9llu ", avg ? val / count : val);
295 else
296 trace_seq_printf(seq, "%9c ", '-');
297}
298
299/*
300 * timerlat_print_summary - print the summary of the hist data to the output
301 */
302static void
303timerlat_print_summary(struct timerlat_hist_params *params,
304 struct trace_instance *trace,
305 struct timerlat_hist_data *data)
306{
307 int cpu;
308
309 if (params->no_summary)
310 return;
311
312 if (!params->no_index)
313 trace_seq_printf(trace->seq, "count:");
314
315 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
316 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus))
317 continue;
318
319 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
320 continue;
321
322 if (!params->no_irq)
323 trace_seq_printf(trace->seq, "%9llu ",
324 data->hist[cpu].irq_count);
325
326 if (!params->no_thread)
327 trace_seq_printf(trace->seq, "%9llu ",
328 data->hist[cpu].thread_count);
329
330 if (params->user_hist)
331 trace_seq_printf(trace->seq, "%9llu ",
332 data->hist[cpu].user_count);
333 }
334 trace_seq_printf(trace->seq, "\n");
335
336 if (!params->no_index)
337 trace_seq_printf(trace->seq, "min: ");
338
339 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
340 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus))
341 continue;
342
343 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
344 continue;
345
346 if (!params->no_irq)
347 format_summary_value(trace->seq,
348 data->hist[cpu].irq_count,
349 data->hist[cpu].min_irq,
350 false);
351
352 if (!params->no_thread)
353 format_summary_value(trace->seq,
354 data->hist[cpu].thread_count,
355 data->hist[cpu].min_thread,
356 false);
357
358 if (params->user_hist)
359 format_summary_value(trace->seq,
360 data->hist[cpu].user_count,
361 data->hist[cpu].min_user,
362 false);
363 }
364 trace_seq_printf(trace->seq, "\n");
365
366 if (!params->no_index)
367 trace_seq_printf(trace->seq, "avg: ");
368
369 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
370 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus))
371 continue;
372
373 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
374 continue;
375
376 if (!params->no_irq)
377 format_summary_value(trace->seq,
378 data->hist[cpu].irq_count,
379 data->hist[cpu].sum_irq,
380 true);
381
382 if (!params->no_thread)
383 format_summary_value(trace->seq,
384 data->hist[cpu].thread_count,
385 data->hist[cpu].sum_thread,
386 true);
387
388 if (params->user_hist)
389 format_summary_value(trace->seq,
390 data->hist[cpu].user_count,
391 data->hist[cpu].sum_user,
392 true);
393 }
394 trace_seq_printf(trace->seq, "\n");
395
396 if (!params->no_index)
397 trace_seq_printf(trace->seq, "max: ");
398
399 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
400 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus))
401 continue;
402
403 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
404 continue;
405
406 if (!params->no_irq)
407 format_summary_value(trace->seq,
408 data->hist[cpu].irq_count,
409 data->hist[cpu].max_irq,
410 false);
411
412 if (!params->no_thread)
413 format_summary_value(trace->seq,
414 data->hist[cpu].thread_count,
415 data->hist[cpu].max_thread,
416 false);
417
418 if (params->user_hist)
419 format_summary_value(trace->seq,
420 data->hist[cpu].user_count,
421 data->hist[cpu].max_user,
422 false);
423 }
424 trace_seq_printf(trace->seq, "\n");
425 trace_seq_do_printf(trace->seq);
426 trace_seq_reset(trace->seq);
427}
428
429static void
430timerlat_print_stats_all(struct timerlat_hist_params *params,
431 struct trace_instance *trace,
432 struct timerlat_hist_data *data)
433{
434 struct timerlat_hist_cpu *cpu_data;
435 struct timerlat_hist_cpu sum;
436 int cpu;
437
438 if (params->no_summary)
439 return;
440
441 memset(&sum, 0, sizeof(sum));
442 sum.min_irq = ~0;
443 sum.min_thread = ~0;
444 sum.min_user = ~0;
445
446 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
447 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus))
448 continue;
449
450 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
451 continue;
452
453 cpu_data = &data->hist[cpu];
454
455 sum.irq_count += cpu_data->irq_count;
456 update_min(&sum.min_irq, &cpu_data->min_irq);
457 update_sum(&sum.sum_irq, &cpu_data->sum_irq);
458 update_max(&sum.max_irq, &cpu_data->max_irq);
459
460 sum.thread_count += cpu_data->thread_count;
461 update_min(&sum.min_thread, &cpu_data->min_thread);
462 update_sum(&sum.sum_thread, &cpu_data->sum_thread);
463 update_max(&sum.max_thread, &cpu_data->max_thread);
464
465 sum.user_count += cpu_data->user_count;
466 update_min(&sum.min_user, &cpu_data->min_user);
467 update_sum(&sum.sum_user, &cpu_data->sum_user);
468 update_max(&sum.max_user, &cpu_data->max_user);
469 }
470
471 if (!params->no_index)
472 trace_seq_printf(trace->seq, "ALL: ");
473
474 if (!params->no_irq)
475 trace_seq_printf(trace->seq, " IRQ");
476
477 if (!params->no_thread)
478 trace_seq_printf(trace->seq, " Thr");
479
480 if (params->user_hist)
481 trace_seq_printf(trace->seq, " Usr");
482
483 trace_seq_printf(trace->seq, "\n");
484
485 if (!params->no_index)
486 trace_seq_printf(trace->seq, "count:");
487
488 if (!params->no_irq)
489 trace_seq_printf(trace->seq, "%9llu ",
490 sum.irq_count);
491
492 if (!params->no_thread)
493 trace_seq_printf(trace->seq, "%9llu ",
494 sum.thread_count);
495
496 if (params->user_hist)
497 trace_seq_printf(trace->seq, "%9llu ",
498 sum.user_count);
499
500 trace_seq_printf(trace->seq, "\n");
501
502 if (!params->no_index)
503 trace_seq_printf(trace->seq, "min: ");
504
505 if (!params->no_irq)
506 format_summary_value(trace->seq,
507 sum.irq_count,
508 sum.min_irq,
509 false);
510
511 if (!params->no_thread)
512 format_summary_value(trace->seq,
513 sum.thread_count,
514 sum.min_thread,
515 false);
516
517 if (params->user_hist)
518 format_summary_value(trace->seq,
519 sum.user_count,
520 sum.min_user,
521 false);
522
523 trace_seq_printf(trace->seq, "\n");
524
525 if (!params->no_index)
526 trace_seq_printf(trace->seq, "avg: ");
527
528 if (!params->no_irq)
529 format_summary_value(trace->seq,
530 sum.irq_count,
531 sum.sum_irq,
532 true);
533
534 if (!params->no_thread)
535 format_summary_value(trace->seq,
536 sum.thread_count,
537 sum.sum_thread,
538 true);
539
540 if (params->user_hist)
541 format_summary_value(trace->seq,
542 sum.user_count,
543 sum.sum_user,
544 true);
545
546 trace_seq_printf(trace->seq, "\n");
547
548 if (!params->no_index)
549 trace_seq_printf(trace->seq, "max: ");
550
551 if (!params->no_irq)
552 format_summary_value(trace->seq,
553 sum.irq_count,
554 sum.max_irq,
555 false);
556
557 if (!params->no_thread)
558 format_summary_value(trace->seq,
559 sum.thread_count,
560 sum.max_thread,
561 false);
562
563 if (params->user_hist)
564 format_summary_value(trace->seq,
565 sum.user_count,
566 sum.max_user,
567 false);
568
569 trace_seq_printf(trace->seq, "\n");
570 trace_seq_do_printf(trace->seq);
571 trace_seq_reset(trace->seq);
572}
573
574/*
575 * timerlat_print_stats - print data for each CPUs
576 */
577static void
578timerlat_print_stats(struct timerlat_hist_params *params, struct osnoise_tool *tool)
579{
580 struct timerlat_hist_data *data = tool->data;
581 struct trace_instance *trace = &tool->trace;
582 int bucket, cpu;
583 int total;
584
585 timerlat_hist_header(tool);
586
587 for (bucket = 0; bucket < data->entries; bucket++) {
588 total = 0;
589
590 if (!params->no_index)
591 trace_seq_printf(trace->seq, "%-6d",
592 bucket * data->bucket_size);
593
594 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
595 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus))
596 continue;
597
598 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
599 continue;
600
601 if (!params->no_irq) {
602 total += data->hist[cpu].irq[bucket];
603 trace_seq_printf(trace->seq, "%9d ",
604 data->hist[cpu].irq[bucket]);
605 }
606
607 if (!params->no_thread) {
608 total += data->hist[cpu].thread[bucket];
609 trace_seq_printf(trace->seq, "%9d ",
610 data->hist[cpu].thread[bucket]);
611 }
612
613 if (params->user_hist) {
614 total += data->hist[cpu].user[bucket];
615 trace_seq_printf(trace->seq, "%9d ",
616 data->hist[cpu].user[bucket]);
617 }
618
619 }
620
621 if (total == 0 && !params->with_zeros) {
622 trace_seq_reset(trace->seq);
623 continue;
624 }
625
626 trace_seq_printf(trace->seq, "\n");
627 trace_seq_do_printf(trace->seq);
628 trace_seq_reset(trace->seq);
629 }
630
631 if (!params->no_index)
632 trace_seq_printf(trace->seq, "over: ");
633
634 for (cpu = 0; cpu < data->nr_cpus; cpu++) {
635 if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus))
636 continue;
637
638 if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
639 continue;
640
641 if (!params->no_irq)
642 trace_seq_printf(trace->seq, "%9d ",
643 data->hist[cpu].irq[data->entries]);
644
645 if (!params->no_thread)
646 trace_seq_printf(trace->seq, "%9d ",
647 data->hist[cpu].thread[data->entries]);
648
649 if (params->user_hist)
650 trace_seq_printf(trace->seq, "%9d ",
651 data->hist[cpu].user[data->entries]);
652 }
653 trace_seq_printf(trace->seq, "\n");
654 trace_seq_do_printf(trace->seq);
655 trace_seq_reset(trace->seq);
656
657 timerlat_print_summary(params, trace, data);
658 timerlat_print_stats_all(params, trace, data);
659}
660
661/*
662 * timerlat_hist_usage - prints timerlat top usage message
663 */
664static void timerlat_hist_usage(char *usage)
665{
666 int i;
667
668 char *msg[] = {
669 "",
670 " usage: [rtla] timerlat hist [-h] [-q] [-d s] [-D] [-n] [-a us] [-p us] [-i us] [-T us] [-s us] \\",
671 " [-t[file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] [-c cpu-list] [-H cpu-list]\\",
672 " [-P priority] [-E N] [-b N] [--no-irq] [--no-thread] [--no-header] [--no-summary] \\",
673 " [--no-index] [--with-zeros] [--dma-latency us] [-C[=cgroup_name]] [--no-aa] [--dump-task] [-u|-k]",
674 " [--warm-up s] [--deepest-idle-state n]",
675 "",
676 " -h/--help: print this menu",
677 " -a/--auto: set automatic trace mode, stopping the session if argument in us latency is hit",
678 " -p/--period us: timerlat period in us",
679 " -i/--irq us: stop trace if the irq latency is higher than the argument in us",
680 " -T/--thread us: stop trace if the thread latency is higher than the argument in us",
681 " -s/--stack us: save the stack trace at the IRQ if a thread latency is higher than the argument in us",
682 " -c/--cpus cpus: run the tracer only on the given cpus",
683 " -H/--house-keeping cpus: run rtla control threads only on the given cpus",
684 " -C/--cgroup[=cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited",
685 " -d/--duration time[m|h|d]: duration of the session in seconds",
686 " --dump-tasks: prints the task running on all CPUs if stop conditions are met (depends on !--no-aa)",
687 " -D/--debug: print debug info",
688 " -t/--trace[file]: save the stopped trace to [file|timerlat_trace.txt]",
689 " -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed",
690 " --filter <filter>: enable a trace event filter to the previous -e event",
691 " --trigger <trigger>: enable a trace event trigger to the previous -e event",
692 " -n/--nano: display data in nanoseconds",
693 " --no-aa: disable auto-analysis, reducing rtla timerlat cpu usage",
694 " -b/--bucket-size N: set the histogram bucket size (default 1)",
695 " -E/--entries N: set the number of entries of the histogram (default 256)",
696 " --no-irq: ignore IRQ latencies",
697 " --no-thread: ignore thread latencies",
698 " --no-header: do not print header",
699 " --no-summary: do not print summary",
700 " --no-index: do not print index",
701 " --with-zeros: print zero only entries",
702 " --dma-latency us: set /dev/cpu_dma_latency latency <us> to reduce exit from idle latency",
703 " -P/--priority o:prio|r:prio|f:prio|d:runtime:period : set scheduling parameters",
704 " o:prio - use SCHED_OTHER with prio",
705 " r:prio - use SCHED_RR with prio",
706 " f:prio - use SCHED_FIFO with prio",
707 " d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period",
708 " in nanoseconds",
709 " -u/--user-threads: use rtla user-space threads instead of kernel-space timerlat threads",
710 " -k/--kernel-threads: use timerlat kernel-space threads instead of rtla user-space threads",
711 " -U/--user-load: enable timerlat for user-defined user-space workload",
712 " --warm-up s: let the workload run for s seconds before collecting data",
713 " --trace-buffer-size kB: set the per-cpu trace buffer size in kB",
714 " --deepest-idle-state n: only go down to idle state n on cpus used by timerlat to reduce exit from idle latency",
715 NULL,
716 };
717
718 if (usage)
719 fprintf(stderr, "%s\n", usage);
720
721 fprintf(stderr, "rtla timerlat hist: a per-cpu histogram of the timer latency (version %s)\n",
722 VERSION);
723
724 for (i = 0; msg[i]; i++)
725 fprintf(stderr, "%s\n", msg[i]);
726
727 if (usage)
728 exit(EXIT_FAILURE);
729
730 exit(EXIT_SUCCESS);
731}
732
733/*
734 * timerlat_hist_parse_args - allocs, parse and fill the cmd line parameters
735 */
736static struct timerlat_hist_params
737*timerlat_hist_parse_args(int argc, char *argv[])
738{
739 struct timerlat_hist_params *params;
740 struct trace_events *tevent;
741 int auto_thresh;
742 int retval;
743 int c;
744
745 params = calloc(1, sizeof(*params));
746 if (!params)
747 exit(1);
748
749 /* disabled by default */
750 params->dma_latency = -1;
751
752 /* disabled by default */
753 params->deepest_idle_state = -2;
754
755 /* display data in microseconds */
756 params->output_divisor = 1000;
757 params->bucket_size = 1;
758 params->entries = 256;
759
760 while (1) {
761 static struct option long_options[] = {
762 {"auto", required_argument, 0, 'a'},
763 {"cpus", required_argument, 0, 'c'},
764 {"cgroup", optional_argument, 0, 'C'},
765 {"bucket-size", required_argument, 0, 'b'},
766 {"debug", no_argument, 0, 'D'},
767 {"entries", required_argument, 0, 'E'},
768 {"duration", required_argument, 0, 'd'},
769 {"house-keeping", required_argument, 0, 'H'},
770 {"help", no_argument, 0, 'h'},
771 {"irq", required_argument, 0, 'i'},
772 {"nano", no_argument, 0, 'n'},
773 {"period", required_argument, 0, 'p'},
774 {"priority", required_argument, 0, 'P'},
775 {"stack", required_argument, 0, 's'},
776 {"thread", required_argument, 0, 'T'},
777 {"trace", optional_argument, 0, 't'},
778 {"user-threads", no_argument, 0, 'u'},
779 {"kernel-threads", no_argument, 0, 'k'},
780 {"user-load", no_argument, 0, 'U'},
781 {"event", required_argument, 0, 'e'},
782 {"no-irq", no_argument, 0, '0'},
783 {"no-thread", no_argument, 0, '1'},
784 {"no-header", no_argument, 0, '2'},
785 {"no-summary", no_argument, 0, '3'},
786 {"no-index", no_argument, 0, '4'},
787 {"with-zeros", no_argument, 0, '5'},
788 {"trigger", required_argument, 0, '6'},
789 {"filter", required_argument, 0, '7'},
790 {"dma-latency", required_argument, 0, '8'},
791 {"no-aa", no_argument, 0, '9'},
792 {"dump-task", no_argument, 0, '\1'},
793 {"warm-up", required_argument, 0, '\2'},
794 {"trace-buffer-size", required_argument, 0, '\3'},
795 {"deepest-idle-state", required_argument, 0, '\4'},
796 {0, 0, 0, 0}
797 };
798
799 /* getopt_long stores the option index here. */
800 int option_index = 0;
801
802 c = getopt_long(argc, argv, "a:c:C::b:d:e:E:DhH:i:knp:P:s:t::T:uU0123456:7:8:9\1\2:\3:",
803 long_options, &option_index);
804
805 /* detect the end of the options. */
806 if (c == -1)
807 break;
808
809 switch (c) {
810 case 'a':
811 auto_thresh = get_llong_from_str(optarg);
812
813 /* set thread stop to auto_thresh */
814 params->stop_total_us = auto_thresh;
815 params->stop_us = auto_thresh;
816
817 /* get stack trace */
818 params->print_stack = auto_thresh;
819
820 /* set trace */
821 params->trace_output = "timerlat_trace.txt";
822
823 break;
824 case 'c':
825 retval = parse_cpu_set(optarg, ¶ms->monitored_cpus);
826 if (retval)
827 timerlat_hist_usage("\nInvalid -c cpu list\n");
828 params->cpus = optarg;
829 break;
830 case 'C':
831 params->cgroup = 1;
832 if (!optarg) {
833 /* will inherit this cgroup */
834 params->cgroup_name = NULL;
835 } else if (*optarg == '=') {
836 /* skip the = */
837 params->cgroup_name = ++optarg;
838 }
839 break;
840 case 'b':
841 params->bucket_size = get_llong_from_str(optarg);
842 if ((params->bucket_size == 0) || (params->bucket_size >= 1000000))
843 timerlat_hist_usage("Bucket size needs to be > 0 and <= 1000000\n");
844 break;
845 case 'D':
846 config_debug = 1;
847 break;
848 case 'd':
849 params->duration = parse_seconds_duration(optarg);
850 if (!params->duration)
851 timerlat_hist_usage("Invalid -D duration\n");
852 break;
853 case 'e':
854 tevent = trace_event_alloc(optarg);
855 if (!tevent) {
856 err_msg("Error alloc trace event");
857 exit(EXIT_FAILURE);
858 }
859
860 if (params->events)
861 tevent->next = params->events;
862
863 params->events = tevent;
864 break;
865 case 'E':
866 params->entries = get_llong_from_str(optarg);
867 if ((params->entries < 10) || (params->entries > 9999999))
868 timerlat_hist_usage("Entries must be > 10 and < 9999999\n");
869 break;
870 case 'h':
871 case '?':
872 timerlat_hist_usage(NULL);
873 break;
874 case 'H':
875 params->hk_cpus = 1;
876 retval = parse_cpu_set(optarg, ¶ms->hk_cpu_set);
877 if (retval) {
878 err_msg("Error parsing house keeping CPUs\n");
879 exit(EXIT_FAILURE);
880 }
881 break;
882 case 'i':
883 params->stop_us = get_llong_from_str(optarg);
884 break;
885 case 'k':
886 params->kernel_workload = 1;
887 break;
888 case 'n':
889 params->output_divisor = 1;
890 break;
891 case 'p':
892 params->timerlat_period_us = get_llong_from_str(optarg);
893 if (params->timerlat_period_us > 1000000)
894 timerlat_hist_usage("Period longer than 1 s\n");
895 break;
896 case 'P':
897 retval = parse_prio(optarg, ¶ms->sched_param);
898 if (retval == -1)
899 timerlat_hist_usage("Invalid -P priority");
900 params->set_sched = 1;
901 break;
902 case 's':
903 params->print_stack = get_llong_from_str(optarg);
904 break;
905 case 'T':
906 params->stop_total_us = get_llong_from_str(optarg);
907 break;
908 case 't':
909 if (optarg) {
910 if (optarg[0] == '=')
911 params->trace_output = &optarg[1];
912 else
913 params->trace_output = &optarg[0];
914 } else if (optind < argc && argv[optind][0] != '-')
915 params->trace_output = argv[optind];
916 else
917 params->trace_output = "timerlat_trace.txt";
918 break;
919 case 'u':
920 params->user_workload = 1;
921 /* fallback: -u implies in -U */
922 case 'U':
923 params->user_hist = 1;
924 break;
925 case '0': /* no irq */
926 params->no_irq = 1;
927 break;
928 case '1': /* no thread */
929 params->no_thread = 1;
930 break;
931 case '2': /* no header */
932 params->no_header = 1;
933 break;
934 case '3': /* no summary */
935 params->no_summary = 1;
936 break;
937 case '4': /* no index */
938 params->no_index = 1;
939 break;
940 case '5': /* with zeros */
941 params->with_zeros = 1;
942 break;
943 case '6': /* trigger */
944 if (params->events) {
945 retval = trace_event_add_trigger(params->events, optarg);
946 if (retval) {
947 err_msg("Error adding trigger %s\n", optarg);
948 exit(EXIT_FAILURE);
949 }
950 } else {
951 timerlat_hist_usage("--trigger requires a previous -e\n");
952 }
953 break;
954 case '7': /* filter */
955 if (params->events) {
956 retval = trace_event_add_filter(params->events, optarg);
957 if (retval) {
958 err_msg("Error adding filter %s\n", optarg);
959 exit(EXIT_FAILURE);
960 }
961 } else {
962 timerlat_hist_usage("--filter requires a previous -e\n");
963 }
964 break;
965 case '8':
966 params->dma_latency = get_llong_from_str(optarg);
967 if (params->dma_latency < 0 || params->dma_latency > 10000) {
968 err_msg("--dma-latency needs to be >= 0 and < 10000");
969 exit(EXIT_FAILURE);
970 }
971 break;
972 case '9':
973 params->no_aa = 1;
974 break;
975 case '\1':
976 params->dump_tasks = 1;
977 break;
978 case '\2':
979 params->warmup = get_llong_from_str(optarg);
980 break;
981 case '\3':
982 params->buffer_size = get_llong_from_str(optarg);
983 break;
984 case '\4':
985 params->deepest_idle_state = get_llong_from_str(optarg);
986 break;
987 default:
988 timerlat_hist_usage("Invalid option");
989 }
990 }
991
992 if (geteuid()) {
993 err_msg("rtla needs root permission\n");
994 exit(EXIT_FAILURE);
995 }
996
997 if (params->no_irq && params->no_thread)
998 timerlat_hist_usage("no-irq and no-thread set, there is nothing to do here");
999
1000 if (params->no_index && !params->with_zeros)
1001 timerlat_hist_usage("no-index set with with-zeros is not set - it does not make sense");
1002
1003 /*
1004 * Auto analysis only happens if stop tracing, thus:
1005 */
1006 if (!params->stop_us && !params->stop_total_us)
1007 params->no_aa = 1;
1008
1009 if (params->kernel_workload && params->user_workload)
1010 timerlat_hist_usage("--kernel-threads and --user-threads are mutually exclusive!");
1011
1012 return params;
1013}
1014
1015/*
1016 * timerlat_hist_apply_config - apply the hist configs to the initialized tool
1017 */
1018static int
1019timerlat_hist_apply_config(struct osnoise_tool *tool, struct timerlat_hist_params *params)
1020{
1021 int retval, i;
1022
1023 if (!params->sleep_time)
1024 params->sleep_time = 1;
1025
1026 if (params->cpus) {
1027 retval = osnoise_set_cpus(tool->context, params->cpus);
1028 if (retval) {
1029 err_msg("Failed to apply CPUs config\n");
1030 goto out_err;
1031 }
1032 } else {
1033 for (i = 0; i < sysconf(_SC_NPROCESSORS_CONF); i++)
1034 CPU_SET(i, ¶ms->monitored_cpus);
1035 }
1036
1037 if (params->stop_us) {
1038 retval = osnoise_set_stop_us(tool->context, params->stop_us);
1039 if (retval) {
1040 err_msg("Failed to set stop us\n");
1041 goto out_err;
1042 }
1043 }
1044
1045 if (params->stop_total_us) {
1046 retval = osnoise_set_stop_total_us(tool->context, params->stop_total_us);
1047 if (retval) {
1048 err_msg("Failed to set stop total us\n");
1049 goto out_err;
1050 }
1051 }
1052
1053 if (params->timerlat_period_us) {
1054 retval = osnoise_set_timerlat_period_us(tool->context, params->timerlat_period_us);
1055 if (retval) {
1056 err_msg("Failed to set timerlat period\n");
1057 goto out_err;
1058 }
1059 }
1060
1061 if (params->print_stack) {
1062 retval = osnoise_set_print_stack(tool->context, params->print_stack);
1063 if (retval) {
1064 err_msg("Failed to set print stack\n");
1065 goto out_err;
1066 }
1067 }
1068
1069 if (params->hk_cpus) {
1070 retval = sched_setaffinity(getpid(), sizeof(params->hk_cpu_set),
1071 ¶ms->hk_cpu_set);
1072 if (retval == -1) {
1073 err_msg("Failed to set rtla to the house keeping CPUs\n");
1074 goto out_err;
1075 }
1076 } else if (params->cpus) {
1077 /*
1078 * Even if the user do not set a house-keeping CPU, try to
1079 * move rtla to a CPU set different to the one where the user
1080 * set the workload to run.
1081 *
1082 * No need to check results as this is an automatic attempt.
1083 */
1084 auto_house_keeping(¶ms->monitored_cpus);
1085 }
1086
1087 /*
1088 * If the user did not specify a type of thread, try user-threads first.
1089 * Fall back to kernel threads otherwise.
1090 */
1091 if (!params->kernel_workload && !params->user_hist) {
1092 retval = tracefs_file_exists(NULL, "osnoise/per_cpu/cpu0/timerlat_fd");
1093 if (retval) {
1094 debug_msg("User-space interface detected, setting user-threads\n");
1095 params->user_workload = 1;
1096 params->user_hist = 1;
1097 } else {
1098 debug_msg("User-space interface not detected, setting kernel-threads\n");
1099 params->kernel_workload = 1;
1100 }
1101 }
1102
1103 /*
1104 * Set workload according to type of thread if the kernel supports it.
1105 * On kernels without support, user threads will have already failed
1106 * on missing timerlat_fd, and kernel threads do not need it.
1107 */
1108 retval = osnoise_set_workload(tool->context, params->kernel_workload);
1109 if (retval < -1) {
1110 err_msg("Failed to set OSNOISE_WORKLOAD option\n");
1111 goto out_err;
1112 }
1113
1114 return 0;
1115
1116out_err:
1117 return -1;
1118}
1119
1120/*
1121 * timerlat_init_hist - initialize a timerlat hist tool with parameters
1122 */
1123static struct osnoise_tool
1124*timerlat_init_hist(struct timerlat_hist_params *params)
1125{
1126 struct osnoise_tool *tool;
1127 int nr_cpus;
1128
1129 nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
1130
1131 tool = osnoise_init_tool("timerlat_hist");
1132 if (!tool)
1133 return NULL;
1134
1135 tool->data = timerlat_alloc_histogram(nr_cpus, params->entries, params->bucket_size);
1136 if (!tool->data)
1137 goto out_err;
1138
1139 tool->params = params;
1140
1141 tep_register_event_handler(tool->trace.tep, -1, "ftrace", "timerlat",
1142 timerlat_hist_handler, tool);
1143
1144 return tool;
1145
1146out_err:
1147 osnoise_destroy_tool(tool);
1148 return NULL;
1149}
1150
1151static int stop_tracing;
1152static struct trace_instance *hist_inst = NULL;
1153static void stop_hist(int sig)
1154{
1155 if (stop_tracing) {
1156 /*
1157 * Stop requested twice in a row; abort event processing and
1158 * exit immediately
1159 */
1160 tracefs_iterate_stop(hist_inst->inst);
1161 return;
1162 }
1163 stop_tracing = 1;
1164 if (hist_inst)
1165 trace_instance_stop(hist_inst);
1166}
1167
1168/*
1169 * timerlat_hist_set_signals - handles the signal to stop the tool
1170 */
1171static void
1172timerlat_hist_set_signals(struct timerlat_hist_params *params)
1173{
1174 signal(SIGINT, stop_hist);
1175 if (params->duration) {
1176 signal(SIGALRM, stop_hist);
1177 alarm(params->duration);
1178 }
1179}
1180
1181int timerlat_hist_main(int argc, char *argv[])
1182{
1183 struct timerlat_hist_params *params;
1184 struct osnoise_tool *record = NULL;
1185 struct timerlat_u_params params_u;
1186 struct osnoise_tool *tool = NULL;
1187 struct osnoise_tool *aa = NULL;
1188 struct trace_instance *trace;
1189 int dma_latency_fd = -1;
1190 int return_value = 1;
1191 pthread_t timerlat_u;
1192 int retval;
1193 int nr_cpus, i;
1194
1195 params = timerlat_hist_parse_args(argc, argv);
1196 if (!params)
1197 exit(1);
1198
1199 tool = timerlat_init_hist(params);
1200 if (!tool) {
1201 err_msg("Could not init osnoise hist\n");
1202 goto out_exit;
1203 }
1204
1205 retval = timerlat_hist_apply_config(tool, params);
1206 if (retval) {
1207 err_msg("Could not apply config\n");
1208 goto out_free;
1209 }
1210
1211 trace = &tool->trace;
1212 /*
1213 * Save trace instance into global variable so that SIGINT can stop
1214 * the timerlat tracer.
1215 * Otherwise, rtla could loop indefinitely when overloaded.
1216 */
1217 hist_inst = trace;
1218
1219 retval = enable_timerlat(trace);
1220 if (retval) {
1221 err_msg("Failed to enable timerlat tracer\n");
1222 goto out_free;
1223 }
1224
1225 if (params->set_sched) {
1226 retval = set_comm_sched_attr("timerlat/", ¶ms->sched_param);
1227 if (retval) {
1228 err_msg("Failed to set sched parameters\n");
1229 goto out_free;
1230 }
1231 }
1232
1233 if (params->cgroup && !params->user_workload) {
1234 retval = set_comm_cgroup("timerlat/", params->cgroup_name);
1235 if (!retval) {
1236 err_msg("Failed to move threads to cgroup\n");
1237 goto out_free;
1238 }
1239 }
1240
1241 if (params->dma_latency >= 0) {
1242 dma_latency_fd = set_cpu_dma_latency(params->dma_latency);
1243 if (dma_latency_fd < 0) {
1244 err_msg("Could not set /dev/cpu_dma_latency.\n");
1245 goto out_free;
1246 }
1247 }
1248
1249 if (params->deepest_idle_state >= -1) {
1250 if (!have_libcpupower_support()) {
1251 err_msg("rtla built without libcpupower, --deepest-idle-state is not supported\n");
1252 goto out_free;
1253 }
1254
1255 nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
1256
1257 for (i = 0; i < nr_cpus; i++) {
1258 if (params->cpus && !CPU_ISSET(i, ¶ms->monitored_cpus))
1259 continue;
1260 if (save_cpu_idle_disable_state(i) < 0) {
1261 err_msg("Could not save cpu idle state.\n");
1262 goto out_free;
1263 }
1264 if (set_deepest_cpu_idle_state(i, params->deepest_idle_state) < 0) {
1265 err_msg("Could not set deepest cpu idle state.\n");
1266 goto out_free;
1267 }
1268 }
1269 }
1270
1271 if (params->trace_output) {
1272 record = osnoise_init_trace_tool("timerlat");
1273 if (!record) {
1274 err_msg("Failed to enable the trace instance\n");
1275 goto out_free;
1276 }
1277
1278 if (params->events) {
1279 retval = trace_events_enable(&record->trace, params->events);
1280 if (retval)
1281 goto out_hist;
1282 }
1283
1284 if (params->buffer_size > 0) {
1285 retval = trace_set_buffer_size(&record->trace, params->buffer_size);
1286 if (retval)
1287 goto out_hist;
1288 }
1289 }
1290
1291 if (!params->no_aa) {
1292 aa = osnoise_init_tool("timerlat_aa");
1293 if (!aa)
1294 goto out_hist;
1295
1296 retval = timerlat_aa_init(aa, params->dump_tasks);
1297 if (retval) {
1298 err_msg("Failed to enable the auto analysis instance\n");
1299 goto out_hist;
1300 }
1301
1302 retval = enable_timerlat(&aa->trace);
1303 if (retval) {
1304 err_msg("Failed to enable timerlat tracer\n");
1305 goto out_hist;
1306 }
1307 }
1308
1309 if (params->user_workload) {
1310 /* rtla asked to stop */
1311 params_u.should_run = 1;
1312 /* all threads left */
1313 params_u.stopped_running = 0;
1314
1315 params_u.set = ¶ms->monitored_cpus;
1316 if (params->set_sched)
1317 params_u.sched_param = ¶ms->sched_param;
1318 else
1319 params_u.sched_param = NULL;
1320
1321 params_u.cgroup_name = params->cgroup_name;
1322
1323 retval = pthread_create(&timerlat_u, NULL, timerlat_u_dispatcher, ¶ms_u);
1324 if (retval)
1325 err_msg("Error creating timerlat user-space threads\n");
1326 }
1327
1328 if (params->warmup > 0) {
1329 debug_msg("Warming up for %d seconds\n", params->warmup);
1330 sleep(params->warmup);
1331 if (stop_tracing)
1332 goto out_hist;
1333 }
1334
1335 /*
1336 * Start the tracers here, after having set all instances.
1337 *
1338 * Let the trace instance start first for the case of hitting a stop
1339 * tracing while enabling other instances. The trace instance is the
1340 * one with most valuable information.
1341 */
1342 if (params->trace_output)
1343 trace_instance_start(&record->trace);
1344 if (!params->no_aa)
1345 trace_instance_start(&aa->trace);
1346 trace_instance_start(trace);
1347
1348 tool->start_time = time(NULL);
1349 timerlat_hist_set_signals(params);
1350
1351 while (!stop_tracing) {
1352 sleep(params->sleep_time);
1353
1354 retval = tracefs_iterate_raw_events(trace->tep,
1355 trace->inst,
1356 NULL,
1357 0,
1358 collect_registered_events,
1359 trace);
1360 if (retval < 0) {
1361 err_msg("Error iterating on events\n");
1362 goto out_hist;
1363 }
1364
1365 if (trace_is_off(&tool->trace, &record->trace))
1366 break;
1367
1368 /* is there still any user-threads ? */
1369 if (params->user_workload) {
1370 if (params_u.stopped_running) {
1371 debug_msg("timerlat user-space threads stopped!\n");
1372 break;
1373 }
1374 }
1375 }
1376
1377 if (params->user_workload && !params_u.stopped_running) {
1378 params_u.should_run = 0;
1379 sleep(1);
1380 }
1381
1382 timerlat_print_stats(params, tool);
1383
1384 return_value = 0;
1385
1386 if (trace_is_off(&tool->trace, &record->trace) && !stop_tracing) {
1387 printf("rtla timerlat hit stop tracing\n");
1388
1389 if (!params->no_aa)
1390 timerlat_auto_analysis(params->stop_us, params->stop_total_us);
1391
1392 if (params->trace_output) {
1393 printf(" Saving trace to %s\n", params->trace_output);
1394 save_trace_to_file(record->trace.inst, params->trace_output);
1395 }
1396 }
1397
1398out_hist:
1399 timerlat_aa_destroy();
1400 if (dma_latency_fd >= 0)
1401 close(dma_latency_fd);
1402 if (params->deepest_idle_state >= -1) {
1403 for (i = 0; i < nr_cpus; i++) {
1404 if (params->cpus && !CPU_ISSET(i, ¶ms->monitored_cpus))
1405 continue;
1406 restore_cpu_idle_disable_state(i);
1407 }
1408 }
1409 trace_events_destroy(&record->trace, params->events);
1410 params->events = NULL;
1411out_free:
1412 timerlat_free_histogram(tool->data);
1413 osnoise_destroy_tool(aa);
1414 osnoise_destroy_tool(record);
1415 osnoise_destroy_tool(tool);
1416 free(params);
1417 free_cpu_idle_disable_states();
1418out_exit:
1419 exit(return_value);
1420}