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 }
284
285 /*
286 * osnoise_top_usage - prints osnoise top usage message
287 */
osnoise_top_usage(struct osnoise_top_params * params,char * usage)288 static void osnoise_top_usage(struct osnoise_top_params *params, char *usage)
289 {
290 int i;
291
292 static const char * const msg[] = {
293 " [-h] [-q] [-D] [-d s] [-a us] [-p us] [-r us] [-s us] [-S us] \\",
294 " [-T us] [-t[file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] \\",
295 " [-c cpu-list] [-H cpu-list] [-P priority] [-C[=cgroup_name]] [--warm-up s]",
296 "",
297 " -h/--help: print this menu",
298 " -a/--auto: set automatic trace mode, stopping the session if argument in us sample is hit",
299 " -p/--period us: osnoise period in us",
300 " -r/--runtime us: osnoise runtime in us",
301 " -s/--stop us: stop trace if a single sample is higher than the argument in us",
302 " -S/--stop-total us: stop trace if the total sample is higher than the argument in us",
303 " -T/--threshold us: the minimum delta to be considered a noise",
304 " -c/--cpus cpu-list: list of cpus to run osnoise threads",
305 " -H/--house-keeping cpus: run rtla control threads only on the given cpus",
306 " -C/--cgroup[=cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited",
307 " -d/--duration time[s|m|h|d]: duration of the session",
308 " -D/--debug: print debug info",
309 " -t/--trace[file]: save the stopped trace to [file|osnoise_trace.txt]",
310 " -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed",
311 " --filter <filter>: enable a trace event filter to the previous -e event",
312 " --trigger <trigger>: enable a trace event trigger to the previous -e event",
313 " -q/--quiet print only a summary at the end",
314 " -P/--priority o:prio|r:prio|f:prio|d:runtime:period : set scheduling parameters",
315 " o:prio - use SCHED_OTHER with prio",
316 " r:prio - use SCHED_RR with prio",
317 " f:prio - use SCHED_FIFO with prio",
318 " d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period",
319 " in nanoseconds",
320 " --warm-up s: let the workload run for s seconds before collecting data",
321 " --trace-buffer-size kB: set the per-cpu trace buffer size in kB",
322 NULL,
323 };
324
325 if (usage)
326 fprintf(stderr, "%s\n", usage);
327
328 if (params->mode == MODE_OSNOISE) {
329 fprintf(stderr,
330 "rtla osnoise top: a per-cpu summary of the OS noise (version %s)\n",
331 VERSION);
332
333 fprintf(stderr, " usage: rtla osnoise [top]");
334 }
335
336 if (params->mode == MODE_HWNOISE) {
337 fprintf(stderr,
338 "rtla hwnoise: a summary of hardware-related noise (version %s)\n",
339 VERSION);
340
341 fprintf(stderr, " usage: rtla hwnoise");
342 }
343
344 for (i = 0; msg[i]; i++)
345 fprintf(stderr, "%s\n", msg[i]);
346
347 if (usage)
348 exit(EXIT_FAILURE);
349
350 exit(EXIT_SUCCESS);
351 }
352
353 /*
354 * osnoise_top_parse_args - allocs, parse and fill the cmd line parameters
355 */
osnoise_top_parse_args(int argc,char ** argv)356 struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
357 {
358 struct osnoise_top_params *params;
359 struct trace_events *tevent;
360 int retval;
361 int c;
362
363 params = calloc(1, sizeof(*params));
364 if (!params)
365 exit(1);
366
367 if (strcmp(argv[0], "hwnoise") == 0) {
368 params->mode = MODE_HWNOISE;
369 /*
370 * Reduce CPU usage for 75% to avoid killing the system.
371 */
372 params->runtime = 750000;
373 params->period = 1000000;
374 }
375
376 while (1) {
377 static struct option long_options[] = {
378 {"auto", required_argument, 0, 'a'},
379 {"cpus", required_argument, 0, 'c'},
380 {"cgroup", optional_argument, 0, 'C'},
381 {"debug", no_argument, 0, 'D'},
382 {"duration", required_argument, 0, 'd'},
383 {"event", required_argument, 0, 'e'},
384 {"house-keeping", required_argument, 0, 'H'},
385 {"help", no_argument, 0, 'h'},
386 {"period", required_argument, 0, 'p'},
387 {"priority", required_argument, 0, 'P'},
388 {"quiet", no_argument, 0, 'q'},
389 {"runtime", required_argument, 0, 'r'},
390 {"stop", required_argument, 0, 's'},
391 {"stop-total", required_argument, 0, 'S'},
392 {"threshold", required_argument, 0, 'T'},
393 {"trace", optional_argument, 0, 't'},
394 {"trigger", required_argument, 0, '0'},
395 {"filter", required_argument, 0, '1'},
396 {"warm-up", required_argument, 0, '2'},
397 {"trace-buffer-size", required_argument, 0, '3'},
398 {0, 0, 0, 0}
399 };
400
401 /* getopt_long stores the option index here. */
402 int option_index = 0;
403
404 c = getopt_long(argc, argv, "a:c:C::d:De:hH:p:P:qr:s:S:t::T:0:1:2:3:",
405 long_options, &option_index);
406
407 /* Detect the end of the options. */
408 if (c == -1)
409 break;
410
411 switch (c) {
412 case 'a':
413 /* set sample stop to auto_thresh */
414 params->stop_us = get_llong_from_str(optarg);
415
416 /* set sample threshold to 1 */
417 params->threshold = 1;
418
419 /* set trace */
420 params->trace_output = "osnoise_trace.txt";
421
422 break;
423 case 'c':
424 retval = parse_cpu_set(optarg, ¶ms->monitored_cpus);
425 if (retval)
426 osnoise_top_usage(params, "\nInvalid -c cpu list\n");
427 params->cpus = optarg;
428 break;
429 case 'C':
430 params->cgroup = 1;
431 if (!optarg) {
432 /* will inherit this cgroup */
433 params->cgroup_name = NULL;
434 } else if (*optarg == '=') {
435 /* skip the = */
436 params->cgroup_name = ++optarg;
437 }
438 break;
439 case 'D':
440 config_debug = 1;
441 break;
442 case 'd':
443 params->duration = parse_seconds_duration(optarg);
444 if (!params->duration)
445 osnoise_top_usage(params, "Invalid -D duration\n");
446 break;
447 case 'e':
448 tevent = trace_event_alloc(optarg);
449 if (!tevent) {
450 err_msg("Error alloc trace event");
451 exit(EXIT_FAILURE);
452 }
453
454 if (params->events)
455 tevent->next = params->events;
456 params->events = tevent;
457
458 break;
459 case 'h':
460 case '?':
461 osnoise_top_usage(params, NULL);
462 break;
463 case 'H':
464 params->hk_cpus = 1;
465 retval = parse_cpu_set(optarg, ¶ms->hk_cpu_set);
466 if (retval) {
467 err_msg("Error parsing house keeping CPUs\n");
468 exit(EXIT_FAILURE);
469 }
470 break;
471 case 'p':
472 params->period = get_llong_from_str(optarg);
473 if (params->period > 10000000)
474 osnoise_top_usage(params, "Period longer than 10 s\n");
475 break;
476 case 'P':
477 retval = parse_prio(optarg, ¶ms->sched_param);
478 if (retval == -1)
479 osnoise_top_usage(params, "Invalid -P priority");
480 params->set_sched = 1;
481 break;
482 case 'q':
483 params->quiet = 1;
484 break;
485 case 'r':
486 params->runtime = get_llong_from_str(optarg);
487 if (params->runtime < 100)
488 osnoise_top_usage(params, "Runtime shorter than 100 us\n");
489 break;
490 case 's':
491 params->stop_us = get_llong_from_str(optarg);
492 break;
493 case 'S':
494 params->stop_total_us = get_llong_from_str(optarg);
495 break;
496 case 't':
497 if (optarg) {
498 if (optarg[0] == '=')
499 params->trace_output = &optarg[1];
500 else
501 params->trace_output = &optarg[0];
502 } else if (optind < argc && argv[optind][0] != '-')
503 params->trace_output = argv[optind];
504 else
505 params->trace_output = "osnoise_trace.txt";
506 break;
507 case 'T':
508 params->threshold = get_llong_from_str(optarg);
509 break;
510 case '0': /* trigger */
511 if (params->events) {
512 retval = trace_event_add_trigger(params->events, optarg);
513 if (retval) {
514 err_msg("Error adding trigger %s\n", optarg);
515 exit(EXIT_FAILURE);
516 }
517 } else {
518 osnoise_top_usage(params, "--trigger requires a previous -e\n");
519 }
520 break;
521 case '1': /* filter */
522 if (params->events) {
523 retval = trace_event_add_filter(params->events, optarg);
524 if (retval) {
525 err_msg("Error adding filter %s\n", optarg);
526 exit(EXIT_FAILURE);
527 }
528 } else {
529 osnoise_top_usage(params, "--filter requires a previous -e\n");
530 }
531 break;
532 case '2':
533 params->warmup = get_llong_from_str(optarg);
534 break;
535 case '3':
536 params->buffer_size = get_llong_from_str(optarg);
537 break;
538 default:
539 osnoise_top_usage(params, "Invalid option");
540 }
541 }
542
543 if (geteuid()) {
544 err_msg("osnoise needs root permission\n");
545 exit(EXIT_FAILURE);
546 }
547
548 return params;
549 }
550
551 /*
552 * osnoise_top_apply_config - apply the top configs to the initialized tool
553 */
554 static int
osnoise_top_apply_config(struct osnoise_tool * tool,struct osnoise_top_params * params)555 osnoise_top_apply_config(struct osnoise_tool *tool, struct osnoise_top_params *params)
556 {
557 int retval;
558
559 if (!params->sleep_time)
560 params->sleep_time = 1;
561
562 if (params->cpus) {
563 retval = osnoise_set_cpus(tool->context, params->cpus);
564 if (retval) {
565 err_msg("Failed to apply CPUs config\n");
566 goto out_err;
567 }
568 }
569
570 if (params->runtime || params->period) {
571 retval = osnoise_set_runtime_period(tool->context,
572 params->runtime,
573 params->period);
574 if (retval) {
575 err_msg("Failed to set runtime and/or period\n");
576 goto out_err;
577 }
578 }
579
580 if (params->stop_us) {
581 retval = osnoise_set_stop_us(tool->context, params->stop_us);
582 if (retval) {
583 err_msg("Failed to set stop us\n");
584 goto out_err;
585 }
586 }
587
588 if (params->stop_total_us) {
589 retval = osnoise_set_stop_total_us(tool->context, params->stop_total_us);
590 if (retval) {
591 err_msg("Failed to set stop total us\n");
592 goto out_err;
593 }
594 }
595
596 if (params->threshold) {
597 retval = osnoise_set_tracing_thresh(tool->context, params->threshold);
598 if (retval) {
599 err_msg("Failed to set tracing_thresh\n");
600 goto out_err;
601 }
602 }
603
604 if (params->mode == MODE_HWNOISE) {
605 retval = osnoise_set_irq_disable(tool->context, 1);
606 if (retval) {
607 err_msg("Failed to set OSNOISE_IRQ_DISABLE option\n");
608 goto out_err;
609 }
610 }
611
612 if (params->hk_cpus) {
613 retval = sched_setaffinity(getpid(), sizeof(params->hk_cpu_set),
614 ¶ms->hk_cpu_set);
615 if (retval == -1) {
616 err_msg("Failed to set rtla to the house keeping CPUs\n");
617 goto out_err;
618 }
619 } else if (params->cpus) {
620 /*
621 * Even if the user do not set a house-keeping CPU, try to
622 * move rtla to a CPU set different to the one where the user
623 * set the workload to run.
624 *
625 * No need to check results as this is an automatic attempt.
626 */
627 auto_house_keeping(¶ms->monitored_cpus);
628 }
629
630 if (isatty(1) && !params->quiet)
631 params->pretty_output = 1;
632
633 return 0;
634
635 out_err:
636 return -1;
637 }
638
639 /*
640 * osnoise_init_top - initialize a osnoise top tool with parameters
641 */
osnoise_init_top(struct osnoise_top_params * params)642 struct osnoise_tool *osnoise_init_top(struct osnoise_top_params *params)
643 {
644 struct osnoise_tool *tool;
645 int nr_cpus;
646
647 nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
648
649 tool = osnoise_init_tool("osnoise_top");
650 if (!tool)
651 return NULL;
652
653 tool->data = osnoise_alloc_top(nr_cpus);
654 if (!tool->data) {
655 osnoise_destroy_tool(tool);
656 return NULL;
657 }
658
659 tool->params = params;
660
661 tep_register_event_handler(tool->trace.tep, -1, "ftrace", "osnoise",
662 osnoise_top_handler, NULL);
663
664 return tool;
665 }
666
667 static int stop_tracing;
stop_top(int sig)668 static void stop_top(int sig)
669 {
670 stop_tracing = 1;
671 }
672
673 /*
674 * osnoise_top_set_signals - handles the signal to stop the tool
675 */
osnoise_top_set_signals(struct osnoise_top_params * params)676 static void osnoise_top_set_signals(struct osnoise_top_params *params)
677 {
678 signal(SIGINT, stop_top);
679 if (params->duration) {
680 signal(SIGALRM, stop_top);
681 alarm(params->duration);
682 }
683 }
684
osnoise_top_main(int argc,char ** argv)685 int osnoise_top_main(int argc, char **argv)
686 {
687 struct osnoise_top_params *params;
688 struct osnoise_tool *record = NULL;
689 struct osnoise_tool *tool = NULL;
690 struct trace_instance *trace;
691 int return_value = 1;
692 int retval;
693
694 params = osnoise_top_parse_args(argc, argv);
695 if (!params)
696 exit(1);
697
698 tool = osnoise_init_top(params);
699 if (!tool) {
700 err_msg("Could not init osnoise top\n");
701 goto out_exit;
702 }
703
704 retval = osnoise_top_apply_config(tool, params);
705 if (retval) {
706 err_msg("Could not apply config\n");
707 goto out_free;
708 }
709
710 trace = &tool->trace;
711
712 retval = enable_osnoise(trace);
713 if (retval) {
714 err_msg("Failed to enable osnoise tracer\n");
715 goto out_free;
716 }
717
718 if (params->set_sched) {
719 retval = set_comm_sched_attr("osnoise/", ¶ms->sched_param);
720 if (retval) {
721 err_msg("Failed to set sched parameters\n");
722 goto out_free;
723 }
724 }
725
726 if (params->cgroup) {
727 retval = set_comm_cgroup("osnoise/", params->cgroup_name);
728 if (!retval) {
729 err_msg("Failed to move threads to cgroup\n");
730 goto out_free;
731 }
732 }
733
734 if (params->trace_output) {
735 record = osnoise_init_trace_tool("osnoise");
736 if (!record) {
737 err_msg("Failed to enable the trace instance\n");
738 goto out_free;
739 }
740
741 if (params->events) {
742 retval = trace_events_enable(&record->trace, params->events);
743 if (retval)
744 goto out_top;
745 }
746
747 if (params->buffer_size > 0) {
748 retval = trace_set_buffer_size(&record->trace, params->buffer_size);
749 if (retval)
750 goto out_top;
751 }
752 }
753
754 /*
755 * Start the tracer here, after having set all instances.
756 *
757 * Let the trace instance start first for the case of hitting a stop
758 * tracing while enabling other instances. The trace instance is the
759 * one with most valuable information.
760 */
761 if (params->trace_output)
762 trace_instance_start(&record->trace);
763 trace_instance_start(trace);
764
765 if (params->warmup > 0) {
766 debug_msg("Warming up for %d seconds\n", params->warmup);
767 sleep(params->warmup);
768 if (stop_tracing)
769 goto out_top;
770
771 /*
772 * Clean up the buffer. The osnoise workload do not run
773 * with tracing off to avoid creating a performance penalty
774 * when not needed.
775 */
776 retval = tracefs_instance_file_write(trace->inst, "trace", "");
777 if (retval < 0) {
778 debug_msg("Error cleaning up the buffer");
779 goto out_top;
780 }
781
782 }
783
784 tool->start_time = time(NULL);
785 osnoise_top_set_signals(params);
786
787 while (!stop_tracing) {
788 sleep(params->sleep_time);
789
790 retval = tracefs_iterate_raw_events(trace->tep,
791 trace->inst,
792 NULL,
793 0,
794 collect_registered_events,
795 trace);
796 if (retval < 0) {
797 err_msg("Error iterating on events\n");
798 goto out_top;
799 }
800
801 if (!params->quiet)
802 osnoise_print_stats(params, tool);
803
804 if (trace_is_off(&tool->trace, &record->trace))
805 break;
806
807 }
808
809 osnoise_print_stats(params, tool);
810
811 return_value = 0;
812
813 if (trace_is_off(&tool->trace, &record->trace)) {
814 printf("osnoise hit stop tracing\n");
815 if (params->trace_output) {
816 printf(" Saving trace to %s\n", params->trace_output);
817 save_trace_to_file(record->trace.inst, params->trace_output);
818 }
819 }
820
821 out_top:
822 trace_events_destroy(&record->trace, params->events);
823 params->events = NULL;
824 out_free:
825 osnoise_free_top(tool->data);
826 osnoise_destroy_tool(record);
827 osnoise_destroy_tool(tool);
828 free(params);
829 out_exit:
830 exit(return_value);
831 }
832