1
// SPDX-License-Identifier: GPL-2.0
2
/*
3
 * Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <[email protected]>
4
 */
5

6
#define _GNU_SOURCE
7
#include <getopt.h>
8
#include <stdlib.h>
9
#include <string.h>
10
#include <signal.h>
11
#include <unistd.h>
12
#include <errno.h>
13
#include <stdio.h>
14
#include <time.h>
15

16
#include "osnoise.h"
17

18
struct osnoise_hist_cpu {
19
	int			*samples;
20
	int			count;
21

22
	unsigned long long	min_sample;
23
	unsigned long long	sum_sample;
24
	unsigned long long	max_sample;
25

26
};
27

28
struct osnoise_hist_data {
29
	struct tracefs_hist	*trace_hist;
30
	struct osnoise_hist_cpu	*hist;
31
	int			entries;
32
	int			bucket_size;
33
	int			nr_cpus;
34
};
35

36
/*
37
 * osnoise_free_histogram - free runtime data
38
 */
39
static void
40
osnoise_free_histogram(struct osnoise_hist_data *data)
41
{
42
	int cpu;
43

44
	/* one histogram for IRQ and one for thread, per CPU */
45
	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
46
		if (data->hist[cpu].samples)
47
			free(data->hist[cpu].samples);
48
	}
49

50
	/* one set of histograms per CPU */
51
	if (data->hist)
52
		free(data->hist);
53

54
	free(data);
55
}
56

57
static void osnoise_free_hist_tool(struct osnoise_tool *tool)
58
{
59
	osnoise_free_histogram(tool->data);
60
}
61

62
/*
63
 * osnoise_alloc_histogram - alloc runtime data
64
 */
65
static struct osnoise_hist_data
66
*osnoise_alloc_histogram(int nr_cpus, int entries, int bucket_size)
67
{
68
	struct osnoise_hist_data *data;
69
	int cpu;
70

71
	data = calloc(1, sizeof(*data));
72
	if (!data)
73
		return NULL;
74

75
	data->entries = entries;
76
	data->bucket_size = bucket_size;
77
	data->nr_cpus = nr_cpus;
78

79
	data->hist = calloc(1, sizeof(*data->hist) * nr_cpus);
80
	if (!data->hist)
81
		goto cleanup;
82

83
	for (cpu = 0; cpu < nr_cpus; cpu++) {
84
		data->hist[cpu].samples = calloc(1, sizeof(*data->hist->samples) * (entries + 1));
85
		if (!data->hist[cpu].samples)
86
			goto cleanup;
87
	}
88

89
	/* set the min to max */
90
	for (cpu = 0; cpu < nr_cpus; cpu++)
91
		data->hist[cpu].min_sample = ~0;
92

93
	return data;
94

95
cleanup:
96
	osnoise_free_histogram(data);
97
	return NULL;
98
}
99

100
static void osnoise_hist_update_multiple(struct osnoise_tool *tool, int cpu,
101
					 unsigned long long duration, int count)
102
{
103
	struct osnoise_params *params = to_osnoise_params(tool->params);
104
	struct osnoise_hist_data *data = tool->data;
105
	unsigned long long total_duration;
106
	int entries = data->entries;
107
	int bucket;
108
	int *hist;
109

110
	if (params->common.output_divisor)
111
		duration = duration / params->common.output_divisor;
112

113
	bucket = duration / data->bucket_size;
114

115
	total_duration = duration * count;
116

117
	hist = data->hist[cpu].samples;
118
	data->hist[cpu].count += count;
119
	update_min(&data->hist[cpu].min_sample, &duration);
120
	update_sum(&data->hist[cpu].sum_sample, &total_duration);
121
	update_max(&data->hist[cpu].max_sample, &duration);
122

123
	if (bucket < entries)
124
		hist[bucket] += count;
125
	else
126
		hist[entries] += count;
127
}
128

129
/*
130
 * osnoise_destroy_trace_hist - disable events used to collect histogram
131
 */
132
static void osnoise_destroy_trace_hist(struct osnoise_tool *tool)
133
{
134
	struct osnoise_hist_data *data = tool->data;
135

136
	tracefs_hist_pause(tool->trace.inst, data->trace_hist);
137
	tracefs_hist_destroy(tool->trace.inst, data->trace_hist);
138
}
139

140
/*
141
 * osnoise_init_trace_hist - enable events used to collect histogram
142
 */
143
static int osnoise_init_trace_hist(struct osnoise_tool *tool)
144
{
145
	struct osnoise_params *params = to_osnoise_params(tool->params);
146
	struct osnoise_hist_data *data = tool->data;
147
	int bucket_size;
148
	char buff[128];
149
	int retval = 0;
150

151
	/*
152
	 * Set the size of the bucket.
153
	 */
154
	bucket_size = params->common.output_divisor * params->common.hist.bucket_size;
155
	snprintf(buff, sizeof(buff), "duration.buckets=%d", bucket_size);
156

157
	data->trace_hist = tracefs_hist_alloc(tool->trace.tep, "osnoise", "sample_threshold",
158
			buff, TRACEFS_HIST_KEY_NORMAL);
159
	if (!data->trace_hist)
160
		return 1;
161

162
	retval = tracefs_hist_add_key(data->trace_hist, "cpu", 0);
163
	if (retval)
164
		goto out_err;
165

166
	retval = tracefs_hist_start(tool->trace.inst, data->trace_hist);
167
	if (retval)
168
		goto out_err;
169

170
	return 0;
171

172
out_err:
173
	osnoise_destroy_trace_hist(tool);
174
	return 1;
175
}
176

177
/*
178
 * osnoise_read_trace_hist - parse histogram file and file osnoise histogram
179
 */
180
static void osnoise_read_trace_hist(struct osnoise_tool *tool)
181
{
182
	struct osnoise_hist_data *data = tool->data;
183
	long long cpu, counter, duration;
184
	char *content, *position;
185

186
	tracefs_hist_pause(tool->trace.inst, data->trace_hist);
187

188
	content = tracefs_event_file_read(tool->trace.inst, "osnoise",
189
					  "sample_threshold",
190
					  "hist", NULL);
191
	if (!content)
192
		return;
193

194
	position = content;
195
	while (true) {
196
		position = strstr(position, "duration: ~");
197
		if (!position)
198
			break;
199
		position += strlen("duration: ~");
200
		duration = get_llong_from_str(position);
201
		if (duration == -1)
202
			err_msg("error reading duration from histogram\n");
203

204
		position = strstr(position, "cpu:");
205
		if (!position)
206
			break;
207
		position += strlen("cpu: ");
208
		cpu = get_llong_from_str(position);
209
		if (cpu == -1)
210
			err_msg("error reading cpu from histogram\n");
211

212
		position = strstr(position, "hitcount:");
213
		if (!position)
214
			break;
215
		position += strlen("hitcount: ");
216
		counter = get_llong_from_str(position);
217
		if (counter == -1)
218
			err_msg("error reading counter from histogram\n");
219

220
		osnoise_hist_update_multiple(tool, cpu, duration, counter);
221
	}
222
	free(content);
223
}
224

225
/*
226
 * osnoise_hist_header - print the header of the tracer to the output
227
 */
228
static void osnoise_hist_header(struct osnoise_tool *tool)
229
{
230
	struct osnoise_params *params = to_osnoise_params(tool->params);
231
	struct osnoise_hist_data *data = tool->data;
232
	struct trace_seq *s = tool->trace.seq;
233
	char duration[26];
234
	int cpu;
235

236
	if (params->common.hist.no_header)
237
		return;
238

239
	get_duration(tool->start_time, duration, sizeof(duration));
240
	trace_seq_printf(s, "# RTLA osnoise histogram\n");
241
	trace_seq_printf(s, "# Time unit is %s (%s)\n",
242
			params->common.output_divisor == 1 ? "nanoseconds" : "microseconds",
243
			params->common.output_divisor == 1 ? "ns" : "us");
244

245
	trace_seq_printf(s, "# Duration: %s\n", duration);
246

247
	if (!params->common.hist.no_index)
248
		trace_seq_printf(s, "Index");
249

250
	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
251
		if (params->common.cpus && !CPU_ISSET(cpu, &params->common.monitored_cpus))
252
			continue;
253

254
		if (!data->hist[cpu].count)
255
			continue;
256

257
		trace_seq_printf(s, "   CPU-%03d", cpu);
258
	}
259
	trace_seq_printf(s, "\n");
260

261
	trace_seq_do_printf(s);
262
	trace_seq_reset(s);
263
}
264

265
/*
266
 * osnoise_print_summary - print the summary of the hist data to the output
267
 */
268
static void
269
osnoise_print_summary(struct osnoise_params *params,
270
		       struct trace_instance *trace,
271
		       struct osnoise_hist_data *data)
272
{
273
	int cpu;
274

275
	if (params->common.hist.no_summary)
276
		return;
277

278
	if (!params->common.hist.no_index)
279
		trace_seq_printf(trace->seq, "count:");
280

281
	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
282
		if (params->common.cpus && !CPU_ISSET(cpu, &params->common.monitored_cpus))
283
			continue;
284

285
		if (!data->hist[cpu].count)
286
			continue;
287

288
		trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].count);
289
	}
290
	trace_seq_printf(trace->seq, "\n");
291

292
	if (!params->common.hist.no_index)
293
		trace_seq_printf(trace->seq, "min:  ");
294

295
	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
296
		if (params->common.cpus && !CPU_ISSET(cpu, &params->common.monitored_cpus))
297
			continue;
298

299
		if (!data->hist[cpu].count)
300
			continue;
301

302
		trace_seq_printf(trace->seq, "%9llu ",	data->hist[cpu].min_sample);
303

304
	}
305
	trace_seq_printf(trace->seq, "\n");
306

307
	if (!params->common.hist.no_index)
308
		trace_seq_printf(trace->seq, "avg:  ");
309

310
	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
311
		if (params->common.cpus && !CPU_ISSET(cpu, &params->common.monitored_cpus))
312
			continue;
313

314
		if (!data->hist[cpu].count)
315
			continue;
316

317
		if (data->hist[cpu].count)
318
			trace_seq_printf(trace->seq, "%9.2f ",
319
				((double) data->hist[cpu].sum_sample) / data->hist[cpu].count);
320
		else
321
			trace_seq_printf(trace->seq, "        - ");
322
	}
323
	trace_seq_printf(trace->seq, "\n");
324

325
	if (!params->common.hist.no_index)
326
		trace_seq_printf(trace->seq, "max:  ");
327

328
	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
329
		if (params->common.cpus && !CPU_ISSET(cpu, &params->common.monitored_cpus))
330
			continue;
331

332
		if (!data->hist[cpu].count)
333
			continue;
334

335
		trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].max_sample);
336

337
	}
338
	trace_seq_printf(trace->seq, "\n");
339
	trace_seq_do_printf(trace->seq);
340
	trace_seq_reset(trace->seq);
341
}
342

343
/*
344
 * osnoise_print_stats - print data for all CPUs
345
 */
346
static void
347
osnoise_print_stats(struct osnoise_tool *tool)
348
{
349
	struct osnoise_params *params = to_osnoise_params(tool->params);
350
	struct osnoise_hist_data *data = tool->data;
351
	struct trace_instance *trace = &tool->trace;
352
	int has_samples = 0;
353
	int bucket, cpu;
354
	int total;
355

356
	osnoise_hist_header(tool);
357

358
	for (bucket = 0; bucket < data->entries; bucket++) {
359
		total = 0;
360

361
		if (!params->common.hist.no_index)
362
			trace_seq_printf(trace->seq, "%-6d",
363
					 bucket * data->bucket_size);
364

365
		for (cpu = 0; cpu < data->nr_cpus; cpu++) {
366
			if (params->common.cpus && !CPU_ISSET(cpu, &params->common.monitored_cpus))
367
				continue;
368

369
			if (!data->hist[cpu].count)
370
				continue;
371

372
			total += data->hist[cpu].samples[bucket];
373
			trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].samples[bucket]);
374
		}
375

376
		if (total == 0 && !params->common.hist.with_zeros) {
377
			trace_seq_reset(trace->seq);
378
			continue;
379
		}
380

381
		/* There are samples above the threshold */
382
		has_samples = 1;
383
		trace_seq_printf(trace->seq, "\n");
384
		trace_seq_do_printf(trace->seq);
385
		trace_seq_reset(trace->seq);
386
	}
387

388
	/*
389
	 * If no samples were recorded, skip calculations, print zeroed statistics
390
	 * and return.
391
	 */
392
	if (!has_samples) {
393
		trace_seq_reset(trace->seq);
394
		trace_seq_printf(trace->seq, "over: 0\ncount: 0\nmin: 0\navg: 0\nmax: 0\n");
395
		trace_seq_do_printf(trace->seq);
396
		trace_seq_reset(trace->seq);
397
		return;
398
	}
399

400
	if (!params->common.hist.no_index)
401
		trace_seq_printf(trace->seq, "over: ");
402

403
	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
404
		if (params->common.cpus && !CPU_ISSET(cpu, &params->common.monitored_cpus))
405
			continue;
406

407
		if (!data->hist[cpu].count)
408
			continue;
409

410
		trace_seq_printf(trace->seq, "%9d ",
411
				 data->hist[cpu].samples[data->entries]);
412
	}
413
	trace_seq_printf(trace->seq, "\n");
414
	trace_seq_do_printf(trace->seq);
415
	trace_seq_reset(trace->seq);
416

417
	osnoise_print_summary(params, trace, data);
418
	osnoise_report_missed_events(tool);
419
}
420

421
/*
422
 * osnoise_hist_usage - prints osnoise hist usage message
423
 */
424
static void osnoise_hist_usage(char *usage)
425
{
426
	int i;
427

428
	static const char * const msg[] = {
429
		"",
430
		"  usage: rtla osnoise hist [-h] [-D] [-d s] [-a us] [-p us] [-r us] [-s us] [-S us] \\",
431
		"	  [-T us] [-t[file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] \\",
432
		"	  [-c cpu-list] [-H cpu-list] [-P priority] [-b N] [-E N] [--no-header] [--no-summary] \\",
433
		"	  [--no-index] [--with-zeros] [-C[=cgroup_name]] [--warm-up]",
434
		"",
435
		"	  -h/--help: print this menu",
436
		"	  -a/--auto: set automatic trace mode, stopping the session if argument in us sample is hit",
437
		"	  -p/--period us: osnoise period in us",
438
		"	  -r/--runtime us: osnoise runtime in us",
439
		"	  -s/--stop us: stop trace if a single sample is higher than the argument in us",
440
		"	  -S/--stop-total us: stop trace if the total sample is higher than the argument in us",
441
		"	  -T/--threshold us: the minimum delta to be considered a noise",
442
		"	  -c/--cpus cpu-list: list of cpus to run osnoise threads",
443
		"	  -H/--house-keeping cpus: run rtla control threads only on the given cpus",
444
		"	  -C/--cgroup[=cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited",
445
		"	  -d/--duration time[s|m|h|d]: duration of the session",
446
		"	  -D/--debug: print debug info",
447
		"	  -t/--trace[file]: save the stopped trace to [file|osnoise_trace.txt]",
448
		"	  -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed",
449
		"	     --filter <filter>: enable a trace event filter to the previous -e event",
450
		"	     --trigger <trigger>: enable a trace event trigger to the previous -e event",
451
		"	  -b/--bucket-size N: set the histogram bucket size (default 1)",
452
		"	  -E/--entries N: set the number of entries of the histogram (default 256)",
453
		"	     --no-header: do not print header",
454
		"	     --no-summary: do not print summary",
455
		"	     --no-index: do not print index",
456
		"	     --with-zeros: print zero only entries",
457
		"	  -P/--priority o:prio|r:prio|f:prio|d:runtime:period: set scheduling parameters",
458
		"		o:prio - use SCHED_OTHER with prio",
459
		"		r:prio - use SCHED_RR with prio",
460
		"		f:prio - use SCHED_FIFO with prio",
461
		"		d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period",
462
		"						       in nanoseconds",
463
		"	     --warm-up: let the workload run for s seconds before collecting data",
464
		"	     --trace-buffer-size kB: set the per-cpu trace buffer size in kB",
465
		"	     --on-threshold <action>: define action to be executed at stop-total threshold, multiple are allowed",
466
		"	     --on-end <action>: define action to be executed at measurement end, multiple are allowed",
467
		NULL,
468
	};
469

470
	if (usage)
471
		fprintf(stderr, "%s\n", usage);
472

473
	fprintf(stderr, "rtla osnoise hist: a per-cpu histogram of the OS noise (version %s)\n",
474
			VERSION);
475

476
	for (i = 0; msg[i]; i++)
477
		fprintf(stderr, "%s\n", msg[i]);
478

479
	if (usage)
480
		exit(EXIT_FAILURE);
481

482
	exit(EXIT_SUCCESS);
483
}
484

485
/*
486
 * osnoise_hist_parse_args - allocs, parse and fill the cmd line parameters
487
 */
488
static struct common_params
489
*osnoise_hist_parse_args(int argc, char *argv[])
490
{
491
	struct osnoise_params *params;
492
	struct trace_events *tevent;
493
	int retval;
494
	int c;
495
	char *trace_output = NULL;
496

497
	params = calloc(1, sizeof(*params));
498
	if (!params)
499
		exit(1);
500

501
	actions_init(&params->common.threshold_actions);
502
	actions_init(&params->common.end_actions);
503

504
	/* display data in microseconds */
505
	params->common.output_divisor = 1000;
506
	params->common.hist.bucket_size = 1;
507
	params->common.hist.entries = 256;
508

509
	while (1) {
510
		static struct option long_options[] = {
511
			{"auto",		required_argument,	0, 'a'},
512
			{"bucket-size",		required_argument,	0, 'b'},
513
			{"entries",		required_argument,	0, 'E'},
514
			{"cpus",		required_argument,	0, 'c'},
515
			{"cgroup",		optional_argument,	0, 'C'},
516
			{"debug",		no_argument,		0, 'D'},
517
			{"duration",		required_argument,	0, 'd'},
518
			{"house-keeping",	required_argument,		0, 'H'},
519
			{"help",		no_argument,		0, 'h'},
520
			{"period",		required_argument,	0, 'p'},
521
			{"priority",		required_argument,	0, 'P'},
522
			{"runtime",		required_argument,	0, 'r'},
523
			{"stop",		required_argument,	0, 's'},
524
			{"stop-total",		required_argument,	0, 'S'},
525
			{"trace",		optional_argument,	0, 't'},
526
			{"event",		required_argument,	0, 'e'},
527
			{"threshold",		required_argument,	0, 'T'},
528
			{"no-header",		no_argument,		0, '0'},
529
			{"no-summary",		no_argument,		0, '1'},
530
			{"no-index",		no_argument,		0, '2'},
531
			{"with-zeros",		no_argument,		0, '3'},
532
			{"trigger",		required_argument,	0, '4'},
533
			{"filter",		required_argument,	0, '5'},
534
			{"warm-up",		required_argument,	0, '6'},
535
			{"trace-buffer-size",	required_argument,	0, '7'},
536
			{"on-threshold",	required_argument,	0, '8'},
537
			{"on-end",		required_argument,	0, '9'},
538
			{0, 0, 0, 0}
539
		};
540

541
		/* getopt_long stores the option index here. */
542
		int option_index = 0;
543

544
		c = getopt_long(argc, argv, "a:c:C::b:d:e:E:DhH:p:P:r:s:S:t::T:01234:5:6:7:",
545
				 long_options, &option_index);
546

547
		/* detect the end of the options. */
548
		if (c == -1)
549
			break;
550

551
		switch (c) {
552
		case 'a':
553
			/* set sample stop to auto_thresh */
554
			params->common.stop_us = get_llong_from_str(optarg);
555

556
			/* set sample threshold to 1 */
557
			params->threshold = 1;
558

559
			/* set trace */
560
			trace_output = "osnoise_trace.txt";
561

562
			break;
563
		case 'b':
564
			params->common.hist.bucket_size = get_llong_from_str(optarg);
565
			if (params->common.hist.bucket_size == 0 ||
566
			    params->common.hist.bucket_size >= 1000000)
567
				osnoise_hist_usage("Bucket size needs to be > 0 and <= 1000000\n");
568
			break;
569
		case 'c':
570
			retval = parse_cpu_set(optarg, &params->common.monitored_cpus);
571
			if (retval)
572
				osnoise_hist_usage("\nInvalid -c cpu list\n");
573
			params->common.cpus = optarg;
574
			break;
575
		case 'C':
576
			params->common.cgroup = 1;
577
			if (!optarg) {
578
				/* will inherit this cgroup */
579
				params->common.cgroup_name = NULL;
580
			} else if (*optarg == '=') {
581
				/* skip the = */
582
				params->common.cgroup_name = ++optarg;
583
			}
584
			break;
585
		case 'D':
586
			config_debug = 1;
587
			break;
588
		case 'd':
589
			params->common.duration = parse_seconds_duration(optarg);
590
			if (!params->common.duration)
591
				osnoise_hist_usage("Invalid -D duration\n");
592
			break;
593
		case 'e':
594
			tevent = trace_event_alloc(optarg);
595
			if (!tevent) {
596
				err_msg("Error alloc trace event");
597
				exit(EXIT_FAILURE);
598
			}
599

600
			if (params->common.events)
601
				tevent->next = params->common.events;
602

603
			params->common.events = tevent;
604
			break;
605
		case 'E':
606
			params->common.hist.entries = get_llong_from_str(optarg);
607
			if (params->common.hist.entries < 10 ||
608
			    params->common.hist.entries > 9999999)
609
				osnoise_hist_usage("Entries must be > 10 and < 9999999\n");
610
			break;
611
		case 'h':
612
		case '?':
613
			osnoise_hist_usage(NULL);
614
			break;
615
		case 'H':
616
			params->common.hk_cpus = 1;
617
			retval = parse_cpu_set(optarg, &params->common.hk_cpu_set);
618
			if (retval) {
619
				err_msg("Error parsing house keeping CPUs\n");
620
				exit(EXIT_FAILURE);
621
			}
622
			break;
623
		case 'p':
624
			params->period = get_llong_from_str(optarg);
625
			if (params->period > 10000000)
626
				osnoise_hist_usage("Period longer than 10 s\n");
627
			break;
628
		case 'P':
629
			retval = parse_prio(optarg, &params->common.sched_param);
630
			if (retval == -1)
631
				osnoise_hist_usage("Invalid -P priority");
632
			params->common.set_sched = 1;
633
			break;
634
		case 'r':
635
			params->runtime = get_llong_from_str(optarg);
636
			if (params->runtime < 100)
637
				osnoise_hist_usage("Runtime shorter than 100 us\n");
638
			break;
639
		case 's':
640
			params->common.stop_us = get_llong_from_str(optarg);
641
			break;
642
		case 'S':
643
			params->common.stop_total_us = get_llong_from_str(optarg);
644
			break;
645
		case 'T':
646
			params->threshold = get_llong_from_str(optarg);
647
			break;
648
		case 't':
649
			if (optarg) {
650
				if (optarg[0] == '=')
651
					trace_output = &optarg[1];
652
				else
653
					trace_output = &optarg[0];
654
			} else if (optind < argc && argv[optind][0] != '0')
655
				trace_output = argv[optind];
656
			else
657
				trace_output = "osnoise_trace.txt";
658
			break;
659
		case '0': /* no header */
660
			params->common.hist.no_header = 1;
661
			break;
662
		case '1': /* no summary */
663
			params->common.hist.no_summary = 1;
664
			break;
665
		case '2': /* no index */
666
			params->common.hist.no_index = 1;
667
			break;
668
		case '3': /* with zeros */
669
			params->common.hist.with_zeros = 1;
670
			break;
671
		case '4': /* trigger */
672
			if (params->common.events) {
673
				retval = trace_event_add_trigger(params->common.events, optarg);
674
				if (retval) {
675
					err_msg("Error adding trigger %s\n", optarg);
676
					exit(EXIT_FAILURE);
677
				}
678
			} else {
679
				osnoise_hist_usage("--trigger requires a previous -e\n");
680
			}
681
			break;
682
		case '5': /* filter */
683
			if (params->common.events) {
684
				retval = trace_event_add_filter(params->common.events, optarg);
685
				if (retval) {
686
					err_msg("Error adding filter %s\n", optarg);
687
					exit(EXIT_FAILURE);
688
				}
689
			} else {
690
				osnoise_hist_usage("--filter requires a previous -e\n");
691
			}
692
			break;
693
		case '6':
694
			params->common.warmup = get_llong_from_str(optarg);
695
			break;
696
		case '7':
697
			params->common.buffer_size = get_llong_from_str(optarg);
698
			break;
699
		case '8':
700
			retval = actions_parse(&params->common.threshold_actions, optarg,
701
					       "osnoise_trace.txt");
702
			if (retval) {
703
				err_msg("Invalid action %s\n", optarg);
704
				exit(EXIT_FAILURE);
705
			}
706
			break;
707
		case '9':
708
			retval = actions_parse(&params->common.end_actions, optarg,
709
					       "osnoise_trace.txt");
710
			if (retval) {
711
				err_msg("Invalid action %s\n", optarg);
712
				exit(EXIT_FAILURE);
713
			}
714
			break;
715
		default:
716
			osnoise_hist_usage("Invalid option");
717
		}
718
	}
719

720
	if (trace_output)
721
		actions_add_trace_output(&params->common.threshold_actions, trace_output);
722

723
	if (geteuid()) {
724
		err_msg("rtla needs root permission\n");
725
		exit(EXIT_FAILURE);
726
	}
727

728
	if (params->common.hist.no_index && !params->common.hist.with_zeros)
729
		osnoise_hist_usage("no-index set and with-zeros not set - it does not make sense");
730

731
	return &params->common;
732
}
733

734
/*
735
 * osnoise_hist_apply_config - apply the hist configs to the initialized tool
736
 */
737
static int
738
osnoise_hist_apply_config(struct osnoise_tool *tool)
739
{
740
	return osnoise_apply_config(tool, to_osnoise_params(tool->params));
741
}
742

743
/*
744
 * osnoise_init_hist - initialize a osnoise hist tool with parameters
745
 */
746
static struct osnoise_tool
747
*osnoise_init_hist(struct common_params *params)
748
{
749
	struct osnoise_tool *tool;
750
	int nr_cpus;
751

752
	nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
753

754
	tool = osnoise_init_tool("osnoise_hist");
755
	if (!tool)
756
		return NULL;
757

758
	tool->data = osnoise_alloc_histogram(nr_cpus, params->hist.entries,
759
					     params->hist.bucket_size);
760
	if (!tool->data)
761
		goto out_err;
762

763
	return tool;
764

765
out_err:
766
	osnoise_destroy_tool(tool);
767
	return NULL;
768
}
769

770
static int osnoise_hist_enable(struct osnoise_tool *tool)
771
{
772
	int retval;
773

774
	retval = osnoise_init_trace_hist(tool);
775
	if (retval)
776
		return retval;
777

778
	return osnoise_enable(tool);
779
}
780

781
static int osnoise_hist_main_loop(struct osnoise_tool *tool)
782
{
783
	int retval;
784

785
	retval = hist_main_loop(tool);
786
	osnoise_read_trace_hist(tool);
787

788
	return retval;
789
}
790

791
struct tool_ops osnoise_hist_ops = {
792
	.tracer = "osnoise",
793
	.comm_prefix = "osnoise/",
794
	.parse_args = osnoise_hist_parse_args,
795
	.init_tool = osnoise_init_hist,
796
	.apply_config = osnoise_hist_apply_config,
797
	.enable = osnoise_hist_enable,
798
	.main = osnoise_hist_main_loop,
799
	.print_stats = osnoise_print_stats,
800
	.free = osnoise_free_hist_tool,
801
};
802

803