tools/perf/util/time-utils.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <sys/time.h>
   5 #include <linux/time64.h>
   6 #include <time.h>
   7 #include <errno.h>
   8 #include <inttypes.h>
   9 #include <math.h>
  10
  11 #include "perf.h"
  12 #include "debug.h"
  13 #include "time-utils.h"
  14 #include "session.h"
  15 #include "evlist.h"
  16
  17 int parse_nsec_time(const char *str, u64 *ptime)
  18 {
  19         u64 time_sec, time_nsec;
  20         char *end;
  21
  22         time_sec = strtoul(str, &end, 10);
  23         if (*end != '.' && *end != '\0')
  24                 return -1;
  25
  26         if (*end == '.') {
  27                 int i;
  28                 char nsec_buf[10];
  29
  30                 if (strlen(++end) > 9)
  31                         return -1;
  32
  33                 strncpy(nsec_buf, end, 9);
  34                 nsec_buf[9] = '\0';
  35
  36                 /* make it nsec precision */
  37                 for (i = strlen(nsec_buf); i < 9; i++)
  38                         nsec_buf[i] = '0';
  39
  40                 time_nsec = strtoul(nsec_buf, &end, 10);
  41                 if (*end != '\0')
  42                         return -1;
  43         } else
  44                 time_nsec = 0;
  45
  46         *ptime = time_sec * NSEC_PER_SEC + time_nsec;
  47         return 0;
  48 }
  49
  50 static int parse_timestr_sec_nsec(struct perf_time_interval *ptime,
  51                                   char *start_str, char *end_str)
  52 {
  53         if (start_str && (*start_str != '\0') &&
  54             (parse_nsec_time(start_str, &ptime->start) != 0)) {
  55                 return -1;
  56         }
  57
  58         if (end_str && (*end_str != '\0') &&
  59             (parse_nsec_time(end_str, &ptime->end) != 0)) {
  60                 return -1;
  61         }
  62
  63         return 0;
  64 }
  65
  66 static int split_start_end(char **start, char **end, const char *ostr, char ch)
  67 {
  68         char *start_str, *end_str;
  69         char *d, *str;
  70
  71         if (ostr == NULL || *ostr == '\0')
  72                 return 0;
  73
  74         /* copy original string because we need to modify it */
  75         str = strdup(ostr);
  76         if (str == NULL)
  77                 return -ENOMEM;
  78
  79         start_str = str;
  80         d = strchr(start_str, ch);
  81         if (d) {
  82                 *d = '\0';
  83                 ++d;
  84         }
  85         end_str = d;
  86
  87         *start = start_str;
  88         *end = end_str;
  89
  90         return 0;
  91 }
  92
  93 int perf_time__parse_str(struct perf_time_interval *ptime, const char *ostr)
  94 {
  95         char *start_str = NULL, *end_str;
  96         int rc;
  97
  98         rc = split_start_end(&start_str, &end_str, ostr, ',');
  99         if (rc || !start_str)
 100                 return rc;
 101
 102         ptime->start = 0;
 103         ptime->end = 0;
 104
 105         rc = parse_timestr_sec_nsec(ptime, start_str, end_str);
 106
 107         free(start_str);
 108
 109         /* make sure end time is after start time if it was given */
 110         if (rc == 0 && ptime->end && ptime->end < ptime->start)
 111                 return -EINVAL;
 112
 113         pr_debug("start time %" PRIu64 ", ", ptime->start);
 114         pr_debug("end time %" PRIu64 "\n", ptime->end);
 115
 116         return rc;
 117 }
 118
 119 static int parse_percent(double *pcnt, char *str)
 120 {
 121         char *c, *endptr;
 122         double d;
 123
 124         c = strchr(str, '%');
 125         if (c)
 126                 *c = '\0';
 127         else
 128                 return -1;
 129
 130         d = strtod(str, &endptr);
 131         if (endptr != str + strlen(str))
 132                 return -1;
 133
 134         *pcnt = d / 100.0;
 135         return 0;
 136 }
 137
 138 static int percent_slash_split(char *str, struct perf_time_interval *ptime,
 139                                u64 start, u64 end)
 140 {
 141         char *p, *end_str;
 142         double pcnt, start_pcnt, end_pcnt;
 143         u64 total = end - start;
 144         int i;
 145
 146         /*
 147          * Example:
 148          * 10%/2: select the second 10% slice and the third 10% slice
 149          */
 150
 151         /* We can modify this string since the original one is copied */
 152         p = strchr(str, '/');
 153         if (!p)
 154                 return -1;
 155
 156         *p = '\0';
 157         if (parse_percent(&pcnt, str) < 0)
 158                 return -1;
 159
 160         p++;
 161         i = (int)strtol(p, &end_str, 10);
 162         if (*end_str)
 163                 return -1;
 164
 165         if (pcnt <= 0.0)
 166                 return -1;
 167
 168         start_pcnt = pcnt * (i - 1);
 169         end_pcnt = pcnt * i;
 170
 171         if (start_pcnt < 0.0 || start_pcnt > 1.0 ||
 172             end_pcnt < 0.0 || end_pcnt > 1.0) {
 173                 return -1;
 174         }
 175
 176         ptime->start = start + round(start_pcnt * total);
 177         ptime->end = start + round(end_pcnt * total);
 178
 179         return 0;
 180 }
 181
 182 static int percent_dash_split(char *str, struct perf_time_interval *ptime,
 183                               u64 start, u64 end)
 184 {
 185         char *start_str = NULL, *end_str;
 186         double start_pcnt, end_pcnt;
 187         u64 total = end - start;
 188         int ret;
 189
 190         /*
 191          * Example: 0%-10%
 192          */
 193
 194         ret = split_start_end(&start_str, &end_str, str, '-');
 195         if (ret || !start_str)
 196                 return ret;
 197
 198         if ((parse_percent(&start_pcnt, start_str) != 0) ||
 199             (parse_percent(&end_pcnt, end_str) != 0)) {
 200                 free(start_str);
 201                 return -1;
 202         }
 203
 204         free(start_str);
 205
 206         if (start_pcnt < 0.0 || start_pcnt > 1.0 ||
 207             end_pcnt < 0.0 || end_pcnt > 1.0 ||
 208             start_pcnt > end_pcnt) {
 209                 return -1;
 210         }
 211
 212         ptime->start = start + round(start_pcnt * total);
 213         ptime->end = start + round(end_pcnt * total);
 214
 215         return 0;
 216 }
 217
 218 typedef int (*time_pecent_split)(char *, struct perf_time_interval *,
 219                                  u64 start, u64 end);
 220
 221 static int percent_comma_split(struct perf_time_interval *ptime_buf, int num,
 222                                const char *ostr, u64 start, u64 end,
 223                                time_pecent_split func)
 224 {
 225         char *str, *p1, *p2;
 226         int len, ret, i = 0;
 227
 228         str = strdup(ostr);
 229         if (str == NULL)
 230                 return -ENOMEM;
 231
 232         len = strlen(str);
 233         p1 = str;
 234
 235         while (p1 < str + len) {
 236                 if (i >= num) {
 237                         free(str);
 238                         return -1;
 239                 }
 240
 241                 p2 = strchr(p1, ',');
 242                 if (p2)
 243                         *p2 = '\0';
 244
 245                 ret = (func)(p1, &ptime_buf[i], start, end);
 246                 if (ret < 0) {
 247                         free(str);
 248                         return -1;
 249                 }
 250
 251                 pr_debug("start time %d: %" PRIu64 ", ", i, ptime_buf[i].start);
 252                 pr_debug("end time %d: %" PRIu64 "\n", i, ptime_buf[i].end);
 253
 254                 i++;
 255
 256                 if (p2)
 257                         p1 = p2 + 1;
 258                 else
 259                         break;
 260         }
 261
 262         free(str);
 263         return i;
 264 }
 265
 266 static int one_percent_convert(struct perf_time_interval *ptime_buf,
 267                                const char *ostr, u64 start, u64 end, char *c)
 268 {
 269         char *str;
 270         int len = strlen(ostr), ret;
 271
 272         /*
 273          * c points to '%'.
 274          * '%' should be the last character
 275          */
 276         if (ostr + len - 1 != c)
 277                 return -1;
 278
 279         /*
 280          * Construct a string like "xx%/1"
 281          */
 282         str = malloc(len + 3);
 283         if (str == NULL)
 284                 return -ENOMEM;
 285
 286         memcpy(str, ostr, len);
 287         strcpy(str + len, "/1");
 288
 289         ret = percent_slash_split(str, ptime_buf, start, end);
 290         if (ret == 0)
 291                 ret = 1;
 292
 293         free(str);
 294         return ret;
 295 }
 296
 297 int perf_time__percent_parse_str(struct perf_time_interval *ptime_buf, int num,
 298                                  const char *ostr, u64 start, u64 end)
 299 {
 300         char *c;
 301
 302         /*
 303          * ostr example:
 304          * 10%/2,10%/3: select the second 10% slice and the third 10% slice
 305          * 0%-10%,30%-40%: multiple time range
 306          * 50%: just one percent
 307          */
 308
 309         memset(ptime_buf, 0, sizeof(*ptime_buf) * num);
 310
 311         c = strchr(ostr, '/');
 312         if (c) {
 313                 return percent_comma_split(ptime_buf, num, ostr, start,
 314                                            end, percent_slash_split);
 315         }
 316
 317         c = strchr(ostr, '-');
 318         if (c) {
 319                 return percent_comma_split(ptime_buf, num, ostr, start,
 320                                            end, percent_dash_split);
 321         }
 322
 323         c = strchr(ostr, '%');
 324         if (c)
 325                 return one_percent_convert(ptime_buf, ostr, start, end, c);
 326
 327         return -1;
 328 }
 329
 330 struct perf_time_interval *perf_time__range_alloc(const char *ostr, int *size)
 331 {
 332         const char *p1, *p2;
 333         int i = 1;
 334         struct perf_time_interval *ptime;
 335
 336         /*
 337          * At least allocate one time range.
 338          */
 339         if (!ostr)
 340                 goto alloc;
 341
 342         p1 = ostr;
 343         while (p1 < ostr + strlen(ostr)) {
 344                 p2 = strchr(p1, ',');
 345                 if (!p2)
 346                         break;
 347
 348                 p1 = p2 + 1;
 349                 i++;
 350         }
 351
 352 alloc:
 353         *size = i;
 354         ptime = calloc(i, sizeof(*ptime));
 355         return ptime;
 356 }
 357
 358 bool perf_time__skip_sample(struct perf_time_interval *ptime, u64 timestamp)
 359 {
 360         /* if time is not set don't drop sample */
 361         if (timestamp == 0)
 362                 return false;
 363
 364         /* otherwise compare sample time to time window */
 365         if ((ptime->start && timestamp < ptime->start) ||
 366             (ptime->end && timestamp > ptime->end)) {
 367                 return true;
 368         }
 369
 370         return false;
 371 }
 372
 373 bool perf_time__ranges_skip_sample(struct perf_time_interval *ptime_buf,
 374                                    int num, u64 timestamp)
 375 {
 376         struct perf_time_interval *ptime;
 377         int i;
 378
 379         if ((!ptime_buf) || (timestamp == 0) || (num == 0))
 380                 return false;
 381
 382         if (num == 1)
 383                 return perf_time__skip_sample(&ptime_buf[0], timestamp);
 384
 385         /*
 386          * start/end of multiple time ranges must be valid.
 387          */
 388         for (i = 0; i < num; i++) {
 389                 ptime = &ptime_buf[i];
 390
 391                 if (timestamp >= ptime->start &&
 392                     ((timestamp < ptime->end && i < num - 1) ||
 393                      (timestamp <= ptime->end && i == num - 1))) {
 394                         break;
 395                 }
 396         }
 397
 398         return (i == num) ? true : false;
 399 }
 400
 401 int perf_time__parse_for_ranges(const char *time_str,
 402                                 struct perf_session *session,
 403                                 struct perf_time_interval **ranges,
 404                                 int *range_size, int *range_num)
 405 {
 406         struct perf_time_interval *ptime_range;
 407         int size, num, ret;
 408
 409         ptime_range = perf_time__range_alloc(time_str, &size);
 410         if (!ptime_range)
 411                 return -ENOMEM;
 412
 413         if (perf_time__parse_str(ptime_range, time_str) != 0) {
 414                 if (session->evlist->first_sample_time == 0 &&
 415                     session->evlist->last_sample_time == 0) {
 416                         pr_err("HINT: no first/last sample time found in perf data.\n"
 417                                "Please use latest perf binary to execute 'perf record'\n"
 418                                "(if '--buildid-all' is enabled, please set '--timestamp-boundary').\n");
 419                         ret = -EINVAL;
 420                         goto error;
 421                 }
 422
 423                 num = perf_time__percent_parse_str(
 424                                 ptime_range, size,
 425                                 time_str,
 426                                 session->evlist->first_sample_time,
 427                                 session->evlist->last_sample_time);
 428
 429                 if (num < 0) {
 430                         pr_err("Invalid time string\n");
 431                         ret = -EINVAL;
 432                         goto error;
 433                 }
 434         } else {
 435                 num = 1;
 436         }
 437
 438         *range_size = size;
 439         *range_num = num;
 440         *ranges = ptime_range;
 441         return 0;
 442
 443 error:
 444         free(ptime_range);
 445         return ret;
 446 }
 447
 448 int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz)
 449 {
 450         u64  sec = timestamp / NSEC_PER_SEC;
 451         u64 usec = (timestamp % NSEC_PER_SEC) / NSEC_PER_USEC;
 452
 453         return scnprintf(buf, sz, "%"PRIu64".%06"PRIu64, sec, usec);
 454 }
 455
 456 int fetch_current_timestamp(char *buf, size_t sz)
 457 {
 458         struct timeval tv;
 459         struct tm tm;
 460         char dt[32];
 461
 462         if (gettimeofday(&tv, NULL) || !localtime_r(&tv.tv_sec, &tm))
 463                 return -1;
 464
 465         if (!strftime(dt, sizeof(dt), "%Y%m%d%H%M%S", &tm))
 466                 return -1;
 467
 468         scnprintf(buf, sz, "%s%02u", dt, (unsigned)tv.tv_usec / 10000);
 469
 470         return 0;
 471 }