1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
4 */
5
6 #define _GNU_SOURCE
7 #include <getopt.h>
8 #include <stdlib.h>
9 #include <string.h>
10 #include <signal.h>
11 #include <unistd.h>
12 #include <stdio.h>
13 #include <time.h>
14 #include <sched.h>
15
16 #include "osnoise.h"
17 #include "utils.h"
18
19 enum osnoise_mode {
20 MODE_OSNOISE = 0,
21 MODE_HWNOISE
22 };
23
24 /*
25 * osnoise top parameters
26 */
27 struct osnoise_top_params {
28 char *cpus;
29 cpu_set_t monitored_cpus;
30 char *trace_output;
31 char *cgroup_name;
32 unsigned long long runtime;
33 unsigned long long period;
34 long long threshold;
35 long long stop_us;
36 long long stop_total_us;
37 int sleep_time;
38 int duration;
39 int quiet;
40 int set_sched;
41 int cgroup;
42 int hk_cpus;
43 int warmup;
44 int buffer_size;
45 int pretty_output;
46 cpu_set_t hk_cpu_set;
47 struct sched_attr sched_param;
48 struct trace_events *events;
49 enum osnoise_mode mode;
50 };
51
52 struct osnoise_top_cpu {
53 unsigned long long sum_runtime;
54 unsigned long long sum_noise;
55 unsigned long long max_noise;
56 unsigned long long max_sample;
57
58 unsigned long long hw_count;
59 unsigned long long nmi_count;
60 unsigned long long irq_count;
61 unsigned long long softirq_count;
62 unsigned long long thread_count;
63
64 int sum_cycles;
65 };
66
67 struct osnoise_top_data {
68 struct osnoise_top_cpu *cpu_data;
69 int nr_cpus;
70 };
71
72 /*
73 * osnoise_free_top - free runtime data
74 */
75 static void
osnoise_free_top(struct osnoise_top_data * data)76 osnoise_free_top(struct osnoise_top_data *data)
77 {
78 free(data->cpu_data);
79 free(data);
80 }
81
82 /*
83 * osnoise_alloc_histogram - alloc runtime data
84 */
osnoise_alloc_top(int nr_cpus)85 static struct osnoise_top_data *osnoise_alloc_top(int nr_cpus)
86 {
87 struct osnoise_top_data *data;
88
89 data = calloc(1, sizeof(*data));
90 if (!data)
91 return NULL;
92
93 data->nr_cpus = nr_cpus;
94
95 /* one set of histograms per CPU */
96 data->cpu_data = calloc(1, sizeof(*data->cpu_data) * nr_cpus);
97 if (!data->cpu_data)
98 goto cleanup;
99
100 return data;
101
102 cleanup:
103 osnoise_free_top(data);
104 return NULL;
105 }
106
107 /*
108 * osnoise_top_handler - this is the handler for osnoise tracer events
109 */
110 static int
osnoise_top_handler(struct trace_seq * s,struct tep_record * record,struct tep_event * event,void * context)111 osnoise_top_handler(struct trace_seq *s, struct tep_record *record,
112 struct tep_event *event, void *context)
113 {
114 struct trace_instance *trace = context;
115 struct osnoise_tool *tool;
116 unsigned long long val;
117 struct osnoise_top_cpu *cpu_data;
118 struct osnoise_top_data *data;
119 int cpu = record->cpu;
120
121 tool = container_of(trace, struct osnoise_tool, trace);
122
123 data = tool->data;
124 cpu_data = &data->cpu_data[cpu];
125
126 cpu_data->sum_cycles++;
127
128 tep_get_field_val(s, event, "runtime", record, &val, 1);
129 update_sum(&cpu_data->sum_runtime, &val);
130
131 tep_get_field_val(s, event, "noise", record, &val, 1);
132 update_max(&cpu_data->max_noise, &val);
133 update_sum(&cpu_data->sum_noise, &val);
134
135 tep_get_field_val(s, event, "max_sample", record, &val, 1);
136 update_max(&cpu_data->max_sample, &val);
137
138 tep_get_field_val(s, event, "hw_count", record, &val, 1);
139 update_sum(&cpu_data->hw_count, &val);
140
141 tep_get_field_val(s, event, "nmi_count", record, &val, 1);
142 update_sum(&cpu_data->nmi_count, &val);
143
144 tep_get_field_val(s, event, "irq_count", record, &val, 1);
145 update_sum(&cpu_data->irq_count, &val);
146
147 tep_get_field_val(s, event, "softirq_count", record, &val, 1);
148 update_sum(&cpu_data->softirq_count, &val);
149
150 tep_get_field_val(s, event, "thread_count", record, &val, 1);
151 update_sum(&cpu_data->thread_count, &val);
152
153 return 0;
154 }
155
156 /*
157 * osnoise_top_header - print the header of the tool output
158 */
osnoise_top_header(struct osnoise_tool * top)159 static void osnoise_top_header(struct osnoise_tool *top)
160 {
161 struct osnoise_top_params *params = top->params;
162 struct trace_seq *s = top->trace.seq;
163 char duration[26];
164
165 get_duration(top->start_time, duration, sizeof(duration));
166
167 if (params->pretty_output)
168 trace_seq_printf(s, "\033[2;37;40m");
169
170 trace_seq_printf(s, " ");
171
172 if (params->mode == MODE_OSNOISE) {
173 trace_seq_printf(s, "Operating System Noise");
174 trace_seq_printf(s, " ");
175 } else if (params->mode == MODE_HWNOISE) {
176 trace_seq_printf(s, "Hardware-related Noise");
177 }
178
179 trace_seq_printf(s, " ");
180
181 if (params->pretty_output)
182 trace_seq_printf(s, "\033[0;0;0m");
183 trace_seq_printf(s, "\n");
184
185 trace_seq_printf(s, "duration: %9s | time is in us\n", duration);
186
187 if (params->pretty_output)
188 trace_seq_printf(s, "\033[2;30;47m");
189
190 trace_seq_printf(s, "CPU Period Runtime ");
191 trace_seq_printf(s, " Noise ");
192 trace_seq_printf(s, " %% CPU Aval ");
193 trace_seq_printf(s, " Max Noise Max Single ");
194 trace_seq_printf(s, " HW NMI");
195
196 if (params->mode == MODE_HWNOISE)
197 goto eol;
198
199 trace_seq_printf(s, " IRQ Softirq Thread");
200
201 eol:
202 if (params->pretty_output)
203 trace_seq_printf(s, "\033[0;0;0m");
204 trace_seq_printf(s, "\n");
205 }
206
207 /*
208 * clear_terminal - clears the output terminal
209 */
clear_terminal(struct trace_seq * seq)210 static void clear_terminal(struct trace_seq *seq)
211 {
212 if (!config_debug)
213 trace_seq_printf(seq, "\033c");
214 }
215
216 /*
217 * osnoise_top_print - prints the output of a given CPU
218 */
osnoise_top_print(struct osnoise_tool * tool,int cpu)219 static void osnoise_top_print(struct osnoise_tool *tool, int cpu)
220 {
221 struct osnoise_top_params *params = tool->params;
222 struct trace_seq *s = tool->trace.seq;
223 struct osnoise_top_cpu *cpu_data;
224 struct osnoise_top_data *data;
225 int percentage;
226 int decimal;
227
228 data = tool->data;
229 cpu_data = &data->cpu_data[cpu];
230
231 if (!cpu_data->sum_runtime)
232 return;
233
234 percentage = ((cpu_data->sum_runtime - cpu_data->sum_noise) * 10000000)
235 / cpu_data->sum_runtime;
236 decimal = percentage % 100000;
237 percentage = percentage / 100000;
238
239 trace_seq_printf(s, "%3d #%-6d %12llu ", cpu, cpu_data->sum_cycles, cpu_data->sum_runtime);
240 trace_seq_printf(s, "%12llu ", cpu_data->sum_noise);
241 trace_seq_printf(s, " %3d.%05d", percentage, decimal);
242 trace_seq_printf(s, "%12llu %12llu", cpu_data->max_noise, cpu_data->max_sample);
243
244 trace_seq_printf(s, "%12llu ", cpu_data->hw_count);
245 trace_seq_printf(s, "%12llu ", cpu_data->nmi_count);
246
247 if (params->mode == MODE_HWNOISE) {
248 trace_seq_printf(s, "\n");
249 return;
250 }
251
252 trace_seq_printf(s, "%12llu ", cpu_data->irq_count);
253 trace_seq_printf(s, "%12llu ", cpu_data->softirq_count);
254 trace_seq_printf(s, "%12llu\n", cpu_data->thread_count);
255 }
256
257 /*
258 * osnoise_print_stats - print data for all cpus
259 */
260 static void
osnoise_print_stats(struct osnoise_top_params * params,struct osnoise_tool * top)261 osnoise_print_stats(struct osnoise_top_params *params, struct osnoise_tool *top)
262 {
263 struct trace_instance *trace = &top->trace;
264 static int nr_cpus = -1;
265 int i;
266
267 if (nr_cpus == -1)
268 nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
269
270 if (!params->quiet)
271 clear_terminal(trace->seq);
272
273 osnoise_top_header(top);
274
275 for (i = 0; i < nr_cpus; i++) {
276 if (params->cpus && !CPU_ISSET(i, ¶ms->monitored_cpus))
277 continue;
278 osnoise_top_print(top, i);
279 }
280
281 trace_seq_do_printf(trace->seq);
282 trace_seq_reset(trace->seq);
283 osnoise_report_missed_events(top);
284 }
285
286 /*
287 * osnoise_top_usage - prints osnoise top usage message
288 */
osnoise_top_usage(struct osnoise_top_params * params,char * usage)289 static void osnoise_top_usage(struct osnoise_top_params *params, char *usage)
290 {
291 int i;
292
293 static const char * const msg[] = {
294 " [-h] [-q] [-D] [-d s] [-a us] [-p us] [-r us] [-s us] [-S us] \\",
295 " [-T us] [-t[file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] \\",
296 " [-c cpu-list] [-H cpu-list] [-P priority] [-C[=cgroup_name]] [--warm-up s]",
297 "",
298 " -h/--help: print this menu",
299 " -a/--auto: set automatic trace mode, stopping the session if argument in us sample is hit",
300 " -p/--period us: osnoise period in us",
301 " -r/--runtime us: osnoise runtime in us",
302 " -s/--stop us: stop trace if a single sample is higher than the argument in us",
303 " -S/--stop-total us: stop trace if the total sample is higher than the argument in us",
304 " -T/--threshold us: the minimum delta to be considered a noise",
305 " -c/--cpus cpu-list: list of cpus to run osnoise threads",
306 " -H/--house-keeping cpus: run rtla control threads only on the given cpus",
307 " -C/--cgroup[=cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited",
308 " -d/--duration time[s|m|h|d]: duration of the session",
309 " -D/--debug: print debug info",
310 " -t/--trace[file]: save the stopped trace to [file|osnoise_trace.txt]",
311 " -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed",
312 " --filter <filter>: enable a trace event filter to the previous -e event",
313 " --trigger <trigger>: enable a trace event trigger to the previous -e event",
314 " -q/--quiet print only a summary at the end",
315 " -P/--priority o:prio|r:prio|f:prio|d:runtime:period : set scheduling parameters",
316 " o:prio - use SCHED_OTHER with prio",
317 " r:prio - use SCHED_RR with prio",
318 " f:prio - use SCHED_FIFO with prio",
319 " d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period",
320 " in nanoseconds",
321 " --warm-up s: let the workload run for s seconds before collecting data",
322 " --trace-buffer-size kB: set the per-cpu trace buffer size in kB",
323 NULL,
324 };
325
326 if (usage)
327 fprintf(stderr, "%s\n", usage);
328
329 if (params->mode == MODE_OSNOISE) {
330 fprintf(stderr,
331 "rtla osnoise top: a per-cpu summary of the OS noise (version %s)\n",
332 VERSION);
333
334 fprintf(stderr, " usage: rtla osnoise [top]");
335 }
336
337 if (params->mode == MODE_HWNOISE) {
338 fprintf(stderr,
339 "rtla hwnoise: a summary of hardware-related noise (version %s)\n",
340 VERSION);
341
342 fprintf(stderr, " usage: rtla hwnoise");
343 }
344
345 for (i = 0; msg[i]; i++)
346 fprintf(stderr, "%s\n", msg[i]);
347
348 if (usage)
349 exit(EXIT_FAILURE);
350
351 exit(EXIT_SUCCESS);
352 }
353
354 /*
355 * osnoise_top_parse_args - allocs, parse and fill the cmd line parameters
356 */
osnoise_top_parse_args(int argc,char ** argv)357 struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
358 {
359 struct osnoise_top_params *params;
360 struct trace_events *tevent;
361 int retval;
362 int c;
363
364 params = calloc(1, sizeof(*params));
365 if (!params)
366 exit(1);
367
368 if (strcmp(argv[0], "hwnoise") == 0) {
369 params->mode = MODE_HWNOISE;
370 /*
371 * Reduce CPU usage for 75% to avoid killing the system.
372 */
373 params->runtime = 750000;
374 params->period = 1000000;
375 }
376
377 while (1) {
378 static struct option long_options[] = {
379 {"auto", required_argument, 0, 'a'},
380 {"cpus", required_argument, 0, 'c'},
381 {"cgroup", optional_argument, 0, 'C'},
382 {"debug", no_argument, 0, 'D'},
383 {"duration", required_argument, 0, 'd'},
384 {"event", required_argument, 0, 'e'},
385 {"house-keeping", required_argument, 0, 'H'},
386 {"help", no_argument, 0, 'h'},
387 {"period", required_argument, 0, 'p'},
388 {"priority", required_argument, 0, 'P'},
389 {"quiet", no_argument, 0, 'q'},
390 {"runtime", required_argument, 0, 'r'},
391 {"stop", required_argument, 0, 's'},
392 {"stop-total", required_argument, 0, 'S'},
393 {"threshold", required_argument, 0, 'T'},
394 {"trace", optional_argument, 0, 't'},
395 {"trigger", required_argument, 0, '0'},
396 {"filter", required_argument, 0, '1'},
397 {"warm-up", required_argument, 0, '2'},
398 {"trace-buffer-size", required_argument, 0, '3'},
399 {0, 0, 0, 0}
400 };
401
402 /* getopt_long stores the option index here. */
403 int option_index = 0;
404
405 c = getopt_long(argc, argv, "a:c:C::d:De:hH:p:P:qr:s:S:t::T:0:1:2:3:",
406 long_options, &option_index);
407
408 /* Detect the end of the options. */
409 if (c == -1)
410 break;
411
412 switch (c) {
413 case 'a':
414 /* set sample stop to auto_thresh */
415 params->stop_us = get_llong_from_str(optarg);
416
417 /* set sample threshold to 1 */
418 params->threshold = 1;
419
420 /* set trace */
421 params->trace_output = "osnoise_trace.txt";
422
423 break;
424 case 'c':
425 retval = parse_cpu_set(optarg, ¶ms->monitored_cpus);
426 if (retval)
427 osnoise_top_usage(params, "\nInvalid -c cpu list\n");
428 params->cpus = optarg;
429 break;
430 case 'C':
431 params->cgroup = 1;
432 if (!optarg) {
433 /* will inherit this cgroup */
434 params->cgroup_name = NULL;
435 } else if (*optarg == '=') {
436 /* skip the = */
437 params->cgroup_name = ++optarg;
438 }
439 break;
440 case 'D':
441 config_debug = 1;
442 break;
443 case 'd':
444 params->duration = parse_seconds_duration(optarg);
445 if (!params->duration)
446 osnoise_top_usage(params, "Invalid -d duration\n");
447 break;
448 case 'e':
449 tevent = trace_event_alloc(optarg);
450 if (!tevent) {
451 err_msg("Error alloc trace event");
452 exit(EXIT_FAILURE);
453 }
454
455 if (params->events)
456 tevent->next = params->events;
457 params->events = tevent;
458
459 break;
460 case 'h':
461 case '?':
462 osnoise_top_usage(params, NULL);
463 break;
464 case 'H':
465 params->hk_cpus = 1;
466 retval = parse_cpu_set(optarg, ¶ms->hk_cpu_set);
467 if (retval) {
468 err_msg("Error parsing house keeping CPUs\n");
469 exit(EXIT_FAILURE);
470 }
471 break;
472 case 'p':
473 params->period = get_llong_from_str(optarg);
474 if (params->period > 10000000)
475 osnoise_top_usage(params, "Period longer than 10 s\n");
476 break;
477 case 'P':
478 retval = parse_prio(optarg, ¶ms->sched_param);
479 if (retval == -1)
480 osnoise_top_usage(params, "Invalid -P priority");
481 params->set_sched = 1;
482 break;
483 case 'q':
484 params->quiet = 1;
485 break;
486 case 'r':
487 params->runtime = get_llong_from_str(optarg);
488 if (params->runtime < 100)
489 osnoise_top_usage(params, "Runtime shorter than 100 us\n");
490 break;
491 case 's':
492 params->stop_us = get_llong_from_str(optarg);
493 break;
494 case 'S':
495 params->stop_total_us = get_llong_from_str(optarg);
496 break;
497 case 't':
498 if (optarg) {
499 if (optarg[0] == '=')
500 params->trace_output = &optarg[1];
501 else
502 params->trace_output = &optarg[0];
503 } else if (optind < argc && argv[optind][0] != '-')
504 params->trace_output = argv[optind];
505 else
506 params->trace_output = "osnoise_trace.txt";
507 break;
508 case 'T':
509 params->threshold = get_llong_from_str(optarg);
510 break;
511 case '0': /* trigger */
512 if (params->events) {
513 retval = trace_event_add_trigger(params->events, optarg);
514 if (retval) {
515 err_msg("Error adding trigger %s\n", optarg);
516 exit(EXIT_FAILURE);
517 }
518 } else {
519 osnoise_top_usage(params, "--trigger requires a previous -e\n");
520 }
521 break;
522 case '1': /* filter */
523 if (params->events) {
524 retval = trace_event_add_filter(params->events, optarg);
525 if (retval) {
526 err_msg("Error adding filter %s\n", optarg);
527 exit(EXIT_FAILURE);
528 }
529 } else {
530 osnoise_top_usage(params, "--filter requires a previous -e\n");
531 }
532 break;
533 case '2':
534 params->warmup = get_llong_from_str(optarg);
535 break;
536 case '3':
537 params->buffer_size = get_llong_from_str(optarg);
538 break;
539 default:
540 osnoise_top_usage(params, "Invalid option");
541 }
542 }
543
544 if (geteuid()) {
545 err_msg("osnoise needs root permission\n");
546 exit(EXIT_FAILURE);
547 }
548
549 return params;
550 }
551
552 /*
553 * osnoise_top_apply_config - apply the top configs to the initialized tool
554 */
555 static int
osnoise_top_apply_config(struct osnoise_tool * tool,struct osnoise_top_params * params)556 osnoise_top_apply_config(struct osnoise_tool *tool, struct osnoise_top_params *params)
557 {
558 int retval;
559
560 if (!params->sleep_time)
561 params->sleep_time = 1;
562
563 if (params->cpus) {
564 retval = osnoise_set_cpus(tool->context, params->cpus);
565 if (retval) {
566 err_msg("Failed to apply CPUs config\n");
567 goto out_err;
568 }
569 }
570
571 if (params->runtime || params->period) {
572 retval = osnoise_set_runtime_period(tool->context,
573 params->runtime,
574 params->period);
575 if (retval) {
576 err_msg("Failed to set runtime and/or period\n");
577 goto out_err;
578 }
579 }
580
581 if (params->stop_us) {
582 retval = osnoise_set_stop_us(tool->context, params->stop_us);
583 if (retval) {
584 err_msg("Failed to set stop us\n");
585 goto out_err;
586 }
587 }
588
589 if (params->stop_total_us) {
590 retval = osnoise_set_stop_total_us(tool->context, params->stop_total_us);
591 if (retval) {
592 err_msg("Failed to set stop total us\n");
593 goto out_err;
594 }
595 }
596
597 if (params->threshold) {
598 retval = osnoise_set_tracing_thresh(tool->context, params->threshold);
599 if (retval) {
600 err_msg("Failed to set tracing_thresh\n");
601 goto out_err;
602 }
603 }
604
605 if (params->mode == MODE_HWNOISE) {
606 retval = osnoise_set_irq_disable(tool->context, 1);
607 if (retval) {
608 err_msg("Failed to set OSNOISE_IRQ_DISABLE option\n");
609 goto out_err;
610 }
611 }
612
613 if (params->hk_cpus) {
614 retval = sched_setaffinity(getpid(), sizeof(params->hk_cpu_set),
615 ¶ms->hk_cpu_set);
616 if (retval == -1) {
617 err_msg("Failed to set rtla to the house keeping CPUs\n");
618 goto out_err;
619 }
620 } else if (params->cpus) {
621 /*
622 * Even if the user do not set a house-keeping CPU, try to
623 * move rtla to a CPU set different to the one where the user
624 * set the workload to run.
625 *
626 * No need to check results as this is an automatic attempt.
627 */
628 auto_house_keeping(¶ms->monitored_cpus);
629 }
630
631 if (isatty(STDOUT_FILENO) && !params->quiet)
632 params->pretty_output = 1;
633
634 return 0;
635
636 out_err:
637 return -1;
638 }
639
640 /*
641 * osnoise_init_top - initialize a osnoise top tool with parameters
642 */
osnoise_init_top(struct osnoise_top_params * params)643 struct osnoise_tool *osnoise_init_top(struct osnoise_top_params *params)
644 {
645 struct osnoise_tool *tool;
646 int nr_cpus;
647
648 nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
649
650 tool = osnoise_init_tool("osnoise_top");
651 if (!tool)
652 return NULL;
653
654 tool->data = osnoise_alloc_top(nr_cpus);
655 if (!tool->data) {
656 osnoise_destroy_tool(tool);
657 return NULL;
658 }
659
660 tool->params = params;
661
662 tep_register_event_handler(tool->trace.tep, -1, "ftrace", "osnoise",
663 osnoise_top_handler, NULL);
664
665 return tool;
666 }
667
668 static int stop_tracing;
stop_top(int sig)669 static void stop_top(int sig)
670 {
671 stop_tracing = 1;
672 }
673
674 /*
675 * osnoise_top_set_signals - handles the signal to stop the tool
676 */
osnoise_top_set_signals(struct osnoise_top_params * params)677 static void osnoise_top_set_signals(struct osnoise_top_params *params)
678 {
679 signal(SIGINT, stop_top);
680 if (params->duration) {
681 signal(SIGALRM, stop_top);
682 alarm(params->duration);
683 }
684 }
685
osnoise_top_main(int argc,char ** argv)686 int osnoise_top_main(int argc, char **argv)
687 {
688 struct osnoise_top_params *params;
689 struct osnoise_tool *record = NULL;
690 struct osnoise_tool *tool = NULL;
691 struct trace_instance *trace;
692 int return_value = 1;
693 int retval;
694
695 params = osnoise_top_parse_args(argc, argv);
696 if (!params)
697 exit(1);
698
699 tool = osnoise_init_top(params);
700 if (!tool) {
701 err_msg("Could not init osnoise top\n");
702 goto out_exit;
703 }
704
705 retval = osnoise_top_apply_config(tool, params);
706 if (retval) {
707 err_msg("Could not apply config\n");
708 goto out_free;
709 }
710
711 trace = &tool->trace;
712
713 retval = enable_osnoise(trace);
714 if (retval) {
715 err_msg("Failed to enable osnoise tracer\n");
716 goto out_free;
717 }
718
719 if (params->set_sched) {
720 retval = set_comm_sched_attr("osnoise/", ¶ms->sched_param);
721 if (retval) {
722 err_msg("Failed to set sched parameters\n");
723 goto out_free;
724 }
725 }
726
727 if (params->cgroup) {
728 retval = set_comm_cgroup("osnoise/", params->cgroup_name);
729 if (!retval) {
730 err_msg("Failed to move threads to cgroup\n");
731 goto out_free;
732 }
733 }
734
735 if (params->trace_output) {
736 record = osnoise_init_trace_tool("osnoise");
737 if (!record) {
738 err_msg("Failed to enable the trace instance\n");
739 goto out_free;
740 }
741
742 if (params->events) {
743 retval = trace_events_enable(&record->trace, params->events);
744 if (retval)
745 goto out_top;
746 }
747
748 if (params->buffer_size > 0) {
749 retval = trace_set_buffer_size(&record->trace, params->buffer_size);
750 if (retval)
751 goto out_top;
752 }
753 }
754
755 /*
756 * Start the tracer here, after having set all instances.
757 *
758 * Let the trace instance start first for the case of hitting a stop
759 * tracing while enabling other instances. The trace instance is the
760 * one with most valuable information.
761 */
762 if (params->trace_output)
763 trace_instance_start(&record->trace);
764 trace_instance_start(trace);
765
766 if (params->warmup > 0) {
767 debug_msg("Warming up for %d seconds\n", params->warmup);
768 sleep(params->warmup);
769 if (stop_tracing)
770 goto out_top;
771
772 /*
773 * Clean up the buffer. The osnoise workload do not run
774 * with tracing off to avoid creating a performance penalty
775 * when not needed.
776 */
777 retval = tracefs_instance_file_write(trace->inst, "trace", "");
778 if (retval < 0) {
779 debug_msg("Error cleaning up the buffer");
780 goto out_top;
781 }
782
783 }
784
785 tool->start_time = time(NULL);
786 osnoise_top_set_signals(params);
787
788 while (!stop_tracing) {
789 sleep(params->sleep_time);
790
791 retval = tracefs_iterate_raw_events(trace->tep,
792 trace->inst,
793 NULL,
794 0,
795 collect_registered_events,
796 trace);
797 if (retval < 0) {
798 err_msg("Error iterating on events\n");
799 goto out_top;
800 }
801
802 if (!params->quiet)
803 osnoise_print_stats(params, tool);
804
805 if (osnoise_trace_is_off(tool, record))
806 break;
807
808 }
809
810 osnoise_print_stats(params, tool);
811
812 return_value = 0;
813
814 if (osnoise_trace_is_off(tool, record)) {
815 printf("osnoise hit stop tracing\n");
816 if (params->trace_output) {
817 printf(" Saving trace to %s\n", params->trace_output);
818 save_trace_to_file(record->trace.inst, params->trace_output);
819 }
820 }
821
822 out_top:
823 trace_events_destroy(&record->trace, params->events);
824 params->events = NULL;
825 out_free:
826 osnoise_free_top(tool->data);
827 osnoise_destroy_tool(record);
828 osnoise_destroy_tool(tool);
829 free(params);
830 out_exit:
831 exit(return_value);
832 }
833