summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/time-utils.c
blob: c2abc259b51dc331c4bc673e57614d88f2975347 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
// SPDX-License-Identifier: GPL-2.0
#include <stdlib.h>
#include <string.h>
#include <linux/string.h>
#include <sys/time.h>
#include <linux/time64.h>
#include <time.h>
#include <errno.h>
#include <inttypes.h>
#include <math.h>
#include <linux/ctype.h>

#include "perf.h"
#include "debug.h"
#include "time-utils.h"
#include "session.h"
#include "evlist.h"

int parse_nsec_time(const char *str, u64 *ptime)
{
	u64 time_sec, time_nsec;
	char *end;

	time_sec = strtoul(str, &end, 10);
	if (*end != '.' && *end != '\0')
		return -1;

	if (*end == '.') {
		int i;
		char nsec_buf[10];

		if (strlen(++end) > 9)
			return -1;

		strncpy(nsec_buf, end, 9);
		nsec_buf[9] = '\0';

		/* make it nsec precision */
		for (i = strlen(nsec_buf); i < 9; i++)
			nsec_buf[i] = '0';

		time_nsec = strtoul(nsec_buf, &end, 10);
		if (*end != '\0')
			return -1;
	} else
		time_nsec = 0;

	*ptime = time_sec * NSEC_PER_SEC + time_nsec;
	return 0;
}

static int parse_timestr_sec_nsec(struct perf_time_interval *ptime,
				  char *start_str, char *end_str)
{
	if (start_str && (*start_str != '\0') &&
	    (parse_nsec_time(start_str, &ptime->start) != 0)) {
		return -1;
	}

	if (end_str && (*end_str != '\0') &&
	    (parse_nsec_time(end_str, &ptime->end) != 0)) {
		return -1;
	}

	return 0;
}

static int split_start_end(char **start, char **end, const char *ostr, char ch)
{
	char *start_str, *end_str;
	char *d, *str;

	if (ostr == NULL || *ostr == '\0')
		return 0;

	/* copy original string because we need to modify it */
	str = strdup(ostr);
	if (str == NULL)
		return -ENOMEM;

	start_str = str;
	d = strchr(start_str, ch);
	if (d) {
		*d = '\0';
		++d;
	}
	end_str = d;

	*start = start_str;
	*end = end_str;

	return 0;
}

int perf_time__parse_str(struct perf_time_interval *ptime, const char *ostr)
{
	char *start_str = NULL, *end_str;
	int rc;

	rc = split_start_end(&start_str, &end_str, ostr, ',');
	if (rc || !start_str)
		return rc;

	ptime->start = 0;
	ptime->end = 0;

	rc = parse_timestr_sec_nsec(ptime, start_str, end_str);

	free(start_str);

	/* make sure end time is after start time if it was given */
	if (rc == 0 && ptime->end && ptime->end < ptime->start)
		return -EINVAL;

	pr_debug("start time %" PRIu64 ", ", ptime->start);
	pr_debug("end time %" PRIu64 "\n", ptime->end);

	return rc;
}

static int perf_time__parse_strs(struct perf_time_interval *ptime,
				 const char *ostr, int size)
{
	const char *cp;
	char *str, *arg, *p;
	int i, num = 0, rc = 0;

	/* Count the commas */
	for (cp = ostr; *cp; cp++)
		num += !!(*cp == ',');

	if (!num)
		return -EINVAL;

	BUG_ON(num > size);

	str = strdup(ostr);
	if (!str)
		return -ENOMEM;

	/* Split the string and parse each piece, except the last */
	for (i = 0, p = str; i < num - 1; i++) {
		arg = p;
		/* Find next comma, there must be one */
		p = skip_spaces(strchr(p, ',') + 1);
		/* Skip the value, must not contain space or comma */
		while (*p && !isspace(*p)) {
			if (*p++ == ',') {
				rc = -EINVAL;
				goto out;
			}
		}
		/* Split and parse */
		if (*p)
			*p++ = 0;
		rc = perf_time__parse_str(ptime + i, arg);
		if (rc < 0)
			goto out;
	}

	/* Parse the last piece */
	rc = perf_time__parse_str(ptime + i, p);
	if (rc < 0)
		goto out;

	/* Check there is no overlap */
	for (i = 0; i < num - 1; i++) {
		if (ptime[i].end >= ptime[i + 1].start) {
			rc = -EINVAL;
			goto out;
		}
	}

	rc = num;
out:
	free(str);

	return rc;
}

static int parse_percent(double *pcnt, char *str)
{
	char *c, *endptr;
	double d;

	c = strchr(str, '%');
	if (c)
		*c = '\0';
	else
		return -1;

	d = strtod(str, &endptr);
	if (endptr != str + strlen(str))
		return -1;

	*pcnt = d / 100.0;
	return 0;
}

static int set_percent_time(struct perf_time_interval *ptime, double start_pcnt,
			    double end_pcnt, u64 start, u64 end)
{
	u64 total = end - start;

	if (start_pcnt < 0.0 || start_pcnt > 1.0 ||
	    end_pcnt < 0.0 || end_pcnt > 1.0) {
		return -1;
	}

	ptime->start = start + round(start_pcnt * total);
	ptime->end = start + round(end_pcnt * total);

	if (ptime->end > ptime->start && ptime->end != end)
		ptime->end -= 1;

	return 0;
}

static int percent_slash_split(char *str, struct perf_time_interval *ptime,
			       u64 start, u64 end)
{
	char *p, *end_str;
	double pcnt, start_pcnt, end_pcnt;
	int i;

	/*
	 * Example:
	 * 10%/2: select the second 10% slice and the third 10% slice
	 */

	/* We can modify this string since the original one is copied */
	p = strchr(str, '/');
	if (!p)
		return -1;

	*p = '\0';
	if (parse_percent(&pcnt, str) < 0)
		return -1;

	p++;
	i = (int)strtol(p, &end_str, 10);
	if (*end_str)
		return -1;

	if (pcnt <= 0.0)
		return -1;

	start_pcnt = pcnt * (i - 1);
	end_pcnt = pcnt * i;

	return set_percent_time(ptime, start_pcnt, end_pcnt, start, end);
}

static int percent_dash_split(char *str, struct perf_time_interval *ptime,
			      u64 start, u64 end)
{
	char *start_str = NULL, *end_str;
	double start_pcnt, end_pcnt;
	int ret;

	/*
	 * Example: 0%-10%
	 */

	ret = split_start_end(&start_str, &end_str, str, '-');
	if (ret || !start_str)
		return ret;

	if ((parse_percent(&start_pcnt, start_str) != 0) ||
	    (parse_percent(&end_pcnt, end_str) != 0)) {
		free(start_str);
		return -1;
	}

	free(start_str);

	return set_percent_time(ptime, start_pcnt, end_pcnt, start, end);
}

typedef int (*time_pecent_split)(char *, struct perf_time_interval *,
				 u64 start, u64 end);

static int percent_comma_split(struct perf_time_interval *ptime_buf, int num,
			       const char *ostr, u64 start, u64 end,
			       time_pecent_split func)
{
	char *str, *p1, *p2;
	int len, ret, i = 0;

	str = strdup(ostr);
	if (str == NULL)
		return -ENOMEM;

	len = strlen(str);
	p1 = str;

	while (p1 < str + len) {
		if (i >= num) {
			free(str);
			return -1;
		}

		p2 = strchr(p1, ',');
		if (p2)
			*p2 = '\0';

		ret = (func)(p1, &ptime_buf[i], start, end);
		if (ret < 0) {
			free(str);
			return -1;
		}

		pr_debug("start time %d: %" PRIu64 ", ", i, ptime_buf[i].start);
		pr_debug("end time %d: %" PRIu64 "\n", i, ptime_buf[i].end);

		i++;

		if (p2)
			p1 = p2 + 1;
		else
			break;
	}

	free(str);
	return i;
}

static int one_percent_convert(struct perf_time_interval *ptime_buf,
			       const char *ostr, u64 start, u64 end, char *c)
{
	char *str;
	int len = strlen(ostr), ret;

	/*
	 * c points to '%'.
	 * '%' should be the last character
	 */
	if (ostr + len - 1 != c)
		return -1;

	/*
	 * Construct a string like "xx%/1"
	 */
	str = malloc(len + 3);
	if (str == NULL)
		return -ENOMEM;

	memcpy(str, ostr, len);
	strcpy(str + len, "/1");

	ret = percent_slash_split(str, ptime_buf, start, end);
	if (ret == 0)
		ret = 1;

	free(str);
	return ret;
}

int perf_time__percent_parse_str(struct perf_time_interval *ptime_buf, int num,
				 const char *ostr, u64 start, u64 end)
{
	char *c;

	/*
	 * ostr example:
	 * 10%/2,10%/3: select the second 10% slice and the third 10% slice
	 * 0%-10%,30%-40%: multiple time range
	 * 50%: just one percent
	 */

	memset(ptime_buf, 0, sizeof(*ptime_buf) * num);

	c = strchr(ostr, '/');
	if (c) {
		return percent_comma_split(ptime_buf, num, ostr, start,
					   end, percent_slash_split);
	}

	c = strchr(ostr, '-');
	if (c) {
		return percent_comma_split(ptime_buf, num, ostr, start,
					   end, percent_dash_split);
	}

	c = strchr(ostr, '%');
	if (c)
		return one_percent_convert(ptime_buf, ostr, start, end, c);

	return -1;
}

struct perf_time_interval *perf_time__range_alloc(const char *ostr, int *size)
{
	const char *p1, *p2;
	int i = 1;
	struct perf_time_interval *ptime;

	/*
	 * At least allocate one time range.
	 */
	if (!ostr)
		goto alloc;

	p1 = ostr;
	while (p1 < ostr + strlen(ostr)) {
		p2 = strchr(p1, ',');
		if (!p2)
			break;

		p1 = p2 + 1;
		i++;
	}

alloc:
	*size = i;
	ptime = calloc(i, sizeof(*ptime));
	return ptime;
}

bool perf_time__skip_sample(struct perf_time_interval *ptime, u64 timestamp)
{
	/* if time is not set don't drop sample */
	if (timestamp == 0)
		return false;

	/* otherwise compare sample time to time window */
	if ((ptime->start && timestamp < ptime->start) ||
	    (ptime->end && timestamp > ptime->end)) {
		return true;
	}

	return false;
}

bool perf_time__ranges_skip_sample(struct perf_time_interval *ptime_buf,
				   int num, u64 timestamp)
{
	struct perf_time_interval *ptime;
	int i;

	if ((!ptime_buf) || (timestamp == 0) || (num == 0))
		return false;

	if (num == 1)
		return perf_time__skip_sample(&ptime_buf[0], timestamp);

	/*
	 * start/end of multiple time ranges must be valid.
	 */
	for (i = 0; i < num; i++) {
		ptime = &ptime_buf[i];

		if (timestamp >= ptime->start &&
		    (timestamp <= ptime->end || !ptime->end)) {
			return false;
		}
	}

	return true;
}

int perf_time__parse_for_ranges(const char *time_str,
				struct perf_session *session,
				struct perf_time_interval **ranges,
				int *range_size, int *range_num)
{
	bool has_percent = strchr(time_str, '%');
	struct perf_time_interval *ptime_range;
	int size, num, ret = -EINVAL;

	ptime_range = perf_time__range_alloc(time_str, &size);
	if (!ptime_range)
		return -ENOMEM;

	if (has_percent) {
		if (session->evlist->first_sample_time == 0 &&
		    session->evlist->last_sample_time == 0) {
			pr_err("HINT: no first/last sample time found in perf data.\n"
			       "Please use latest perf binary to execute 'perf record'\n"
			       "(if '--buildid-all' is enabled, please set '--timestamp-boundary').\n");
			goto error;
		}

		num = perf_time__percent_parse_str(
				ptime_range, size,
				time_str,
				session->evlist->first_sample_time,
				session->evlist->last_sample_time);
	} else {
		num = perf_time__parse_strs(ptime_range, time_str, size);
	}

	if (num < 0)
		goto error_invalid;

	*range_size = size;
	*range_num = num;
	*ranges = ptime_range;
	return 0;

error_invalid:
	pr_err("Invalid time string\n");
error:
	free(ptime_range);
	return ret;
}

int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz)
{
	u64  sec = timestamp / NSEC_PER_SEC;
	u64 usec = (timestamp % NSEC_PER_SEC) / NSEC_PER_USEC;

	return scnprintf(buf, sz, "%"PRIu64".%06"PRIu64, sec, usec);
}

int timestamp__scnprintf_nsec(u64 timestamp, char *buf, size_t sz)
{
	u64 sec  = timestamp / NSEC_PER_SEC,
	    nsec = timestamp % NSEC_PER_SEC;

	return scnprintf(buf, sz, "%" PRIu64 ".%09" PRIu64, sec, nsec);
}

int fetch_current_timestamp(char *buf, size_t sz)
{
	struct timeval tv;
	struct tm tm;
	char dt[32];

	if (gettimeofday(&tv, NULL) || !localtime_r(&tv.tv_sec, &tm))
		return -1;

	if (!strftime(dt, sizeof(dt), "%Y%m%d%H%M%S", &tm))
		return -1;

	scnprintf(buf, sz, "%s%02u", dt, (unsigned)tv.tv_usec / 10000);

	return 0;
}