Commit | Line | Data |
---|---|---|
1aed2671 | 1 | #include "../perf.h" |
4cf40131 | 2 | #include "util.h" |
84f5d36f | 3 | #include "debug.h" |
cd0cfad7 | 4 | #include <api/fs/fs.h> |
69e3f52d | 5 | #include <sys/mman.h> |
89fe808a | 6 | #ifdef HAVE_BACKTRACE_SUPPORT |
dc4552bf | 7 | #include <execinfo.h> |
c9f08bee | 8 | #endif |
dc4552bf ACM |
9 | #include <stdio.h> |
10 | #include <stdlib.h> | |
cef82c9f JO |
11 | #include <string.h> |
12 | #include <errno.h> | |
1a47245d | 13 | #include <limits.h> |
71db07b1 | 14 | #include <byteswap.h> |
838d1452 | 15 | #include <linux/kernel.h> |
9398c484 | 16 | #include <unistd.h> |
23aadb1f JO |
17 | #include "callchain.h" |
18 | ||
19 | struct callchain_param callchain_param = { | |
20 | .mode = CHAIN_GRAPH_REL, | |
21 | .min_percent = 0.5, | |
22 | .order = ORDER_CALLEE, | |
23 | .key = CCKEY_FUNCTION | |
24 | }; | |
4cf40131 | 25 | |
1aed2671 JR |
26 | /* |
27 | * XXX We need to find a better place for these things... | |
28 | */ | |
0c1fe6b2 | 29 | unsigned int page_size; |
2b1b7100 | 30 | int cacheline_size; |
0c1fe6b2 | 31 | |
0c6332e9 ACM |
32 | bool test_attr__enabled; |
33 | ||
1aed2671 | 34 | bool perf_host = true; |
c4a7dca9 | 35 | bool perf_guest = false; |
1aed2671 | 36 | |
9f44f0cc | 37 | char tracing_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing"; |
1355915a BP |
38 | char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events"; |
39 | ||
1aed2671 JR |
40 | void event_attr_init(struct perf_event_attr *attr) |
41 | { | |
42 | if (!perf_host) | |
43 | attr->exclude_host = 1; | |
44 | if (!perf_guest) | |
45 | attr->exclude_guest = 1; | |
7e1ccd38 SE |
46 | /* to capture ABI version */ |
47 | attr->size = sizeof(*attr); | |
1aed2671 JR |
48 | } |
49 | ||
4cf40131 ACM |
50 | int mkdir_p(char *path, mode_t mode) |
51 | { | |
52 | struct stat st; | |
53 | int err; | |
54 | char *d = path; | |
55 | ||
56 | if (*d != '/') | |
57 | return -1; | |
58 | ||
59 | if (stat(path, &st) == 0) | |
60 | return 0; | |
61 | ||
62 | while (*++d == '/'); | |
63 | ||
64 | while ((d = strchr(d, '/'))) { | |
65 | *d = '\0'; | |
66 | err = stat(path, &st) && mkdir(path, mode); | |
67 | *d++ = '/'; | |
68 | if (err) | |
69 | return -1; | |
70 | while (*d == '/') | |
71 | ++d; | |
72 | } | |
73 | return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0; | |
74 | } | |
75 | ||
0b1de0be NK |
76 | int rm_rf(char *path) |
77 | { | |
78 | DIR *dir; | |
79 | int ret = 0; | |
80 | struct dirent *d; | |
81 | char namebuf[PATH_MAX]; | |
82 | ||
83 | dir = opendir(path); | |
84 | if (dir == NULL) | |
85 | return 0; | |
86 | ||
87 | while ((d = readdir(dir)) != NULL && !ret) { | |
88 | struct stat statbuf; | |
89 | ||
90 | if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, "..")) | |
91 | continue; | |
92 | ||
93 | scnprintf(namebuf, sizeof(namebuf), "%s/%s", | |
94 | path, d->d_name); | |
95 | ||
96 | ret = stat(namebuf, &statbuf); | |
97 | if (ret < 0) { | |
98 | pr_debug("stat failed: %s\n", namebuf); | |
99 | break; | |
100 | } | |
101 | ||
102 | if (S_ISREG(statbuf.st_mode)) | |
103 | ret = unlink(namebuf); | |
104 | else if (S_ISDIR(statbuf.st_mode)) | |
105 | ret = rm_rf(namebuf); | |
106 | else { | |
107 | pr_debug("unknown file: %s\n", namebuf); | |
108 | ret = -1; | |
109 | } | |
110 | } | |
111 | closedir(dir); | |
112 | ||
113 | if (ret < 0) | |
114 | return ret; | |
115 | ||
116 | return rmdir(path); | |
117 | } | |
118 | ||
d7c72606 | 119 | static int slow_copyfile(const char *from, const char *to) |
9e201442 | 120 | { |
9a17d726 | 121 | int err = -1; |
9e201442 ACM |
122 | char *line = NULL; |
123 | size_t n; | |
124 | FILE *from_fp = fopen(from, "r"), *to_fp; | |
125 | ||
126 | if (from_fp == NULL) | |
127 | goto out; | |
128 | ||
129 | to_fp = fopen(to, "w"); | |
130 | if (to_fp == NULL) | |
131 | goto out_fclose_from; | |
132 | ||
133 | while (getline(&line, &n, from_fp) > 0) | |
134 | if (fputs(line, to_fp) == EOF) | |
135 | goto out_fclose_to; | |
136 | err = 0; | |
137 | out_fclose_to: | |
138 | fclose(to_fp); | |
139 | free(line); | |
140 | out_fclose_from: | |
141 | fclose(from_fp); | |
142 | out: | |
143 | return err; | |
144 | } | |
145 | ||
9c9f5a2f NK |
146 | int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size) |
147 | { | |
148 | void *ptr; | |
149 | loff_t pgoff; | |
150 | ||
151 | pgoff = off_in & ~(page_size - 1); | |
152 | off_in -= pgoff; | |
153 | ||
154 | ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff); | |
155 | if (ptr == MAP_FAILED) | |
156 | return -1; | |
157 | ||
158 | while (size) { | |
159 | ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out); | |
160 | if (ret < 0 && errno == EINTR) | |
161 | continue; | |
162 | if (ret <= 0) | |
163 | break; | |
164 | ||
165 | size -= ret; | |
166 | off_in += ret; | |
167 | off_out -= ret; | |
168 | } | |
169 | munmap(ptr, off_in + size); | |
170 | ||
171 | return size ? -1 : 0; | |
172 | } | |
173 | ||
9a17d726 | 174 | int copyfile_mode(const char *from, const char *to, mode_t mode) |
4cf40131 ACM |
175 | { |
176 | int fromfd, tofd; | |
177 | struct stat st; | |
4cf40131 | 178 | int err = -1; |
d7c72606 | 179 | char *tmp = NULL, *ptr = NULL; |
4cf40131 ACM |
180 | |
181 | if (stat(from, &st)) | |
182 | goto out; | |
183 | ||
d7c72606 MV |
184 | /* extra 'x' at the end is to reserve space for '.' */ |
185 | if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) { | |
186 | tmp = NULL; | |
4cf40131 | 187 | goto out; |
d7c72606 MV |
188 | } |
189 | ptr = strrchr(tmp, '/'); | |
190 | if (!ptr) | |
191 | goto out; | |
192 | ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1); | |
193 | *ptr = '.'; | |
4cf40131 | 194 | |
d7c72606 | 195 | tofd = mkstemp(tmp); |
4cf40131 | 196 | if (tofd < 0) |
d7c72606 MV |
197 | goto out; |
198 | ||
199 | if (fchmod(tofd, mode)) | |
200 | goto out_close_to; | |
201 | ||
202 | if (st.st_size == 0) { /* /proc? do it slowly... */ | |
203 | err = slow_copyfile(from, tmp); | |
204 | goto out_close_to; | |
205 | } | |
206 | ||
207 | fromfd = open(from, O_RDONLY); | |
208 | if (fromfd < 0) | |
209 | goto out_close_to; | |
4cf40131 | 210 | |
9c9f5a2f | 211 | err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size); |
4cf40131 | 212 | |
4cf40131 | 213 | close(fromfd); |
d7c72606 MV |
214 | out_close_to: |
215 | close(tofd); | |
216 | if (!err) | |
217 | err = link(tmp, to); | |
218 | unlink(tmp); | |
4cf40131 | 219 | out: |
d7c72606 | 220 | free(tmp); |
4cf40131 ACM |
221 | return err; |
222 | } | |
c82ee828 | 223 | |
9a17d726 AH |
224 | int copyfile(const char *from, const char *to) |
225 | { | |
226 | return copyfile_mode(from, to, 0755); | |
227 | } | |
228 | ||
c82ee828 ACM |
229 | unsigned long convert_unit(unsigned long value, char *unit) |
230 | { | |
231 | *unit = ' '; | |
232 | ||
233 | if (value > 1000) { | |
234 | value /= 1000; | |
235 | *unit = 'K'; | |
236 | } | |
237 | ||
238 | if (value > 1000) { | |
239 | value /= 1000; | |
240 | *unit = 'M'; | |
241 | } | |
242 | ||
243 | if (value > 1000) { | |
244 | value /= 1000; | |
245 | *unit = 'G'; | |
246 | } | |
247 | ||
248 | return value; | |
249 | } | |
1e7972cc | 250 | |
bc3a502b | 251 | static ssize_t ion(bool is_read, int fd, void *buf, size_t n) |
1e7972cc ACM |
252 | { |
253 | void *buf_start = buf; | |
838d1452 | 254 | size_t left = n; |
1e7972cc | 255 | |
838d1452 | 256 | while (left) { |
bc3a502b JO |
257 | ssize_t ret = is_read ? read(fd, buf, left) : |
258 | write(fd, buf, left); | |
1e7972cc | 259 | |
e148c760 NK |
260 | if (ret < 0 && errno == EINTR) |
261 | continue; | |
1e7972cc ACM |
262 | if (ret <= 0) |
263 | return ret; | |
264 | ||
838d1452 JO |
265 | left -= ret; |
266 | buf += ret; | |
1e7972cc ACM |
267 | } |
268 | ||
838d1452 JO |
269 | BUG_ON((size_t)(buf - buf_start) != n); |
270 | return n; | |
1e7972cc | 271 | } |
61e04b33 | 272 | |
bc3a502b JO |
273 | /* |
274 | * Read exactly 'n' bytes or return an error. | |
275 | */ | |
276 | ssize_t readn(int fd, void *buf, size_t n) | |
277 | { | |
278 | return ion(true, fd, buf, n); | |
279 | } | |
280 | ||
281 | /* | |
282 | * Write exactly 'n' bytes or return an error. | |
283 | */ | |
284 | ssize_t writen(int fd, void *buf, size_t n) | |
285 | { | |
286 | return ion(false, fd, buf, n); | |
287 | } | |
288 | ||
61e04b33 ACM |
289 | size_t hex_width(u64 v) |
290 | { | |
291 | size_t n = 1; | |
292 | ||
293 | while ((v >>= 4)) | |
294 | ++n; | |
295 | ||
296 | return n; | |
297 | } | |
dc4552bf | 298 | |
b2aff5f6 JO |
299 | static int hex(char ch) |
300 | { | |
301 | if ((ch >= '0') && (ch <= '9')) | |
302 | return ch - '0'; | |
303 | if ((ch >= 'a') && (ch <= 'f')) | |
304 | return ch - 'a' + 10; | |
305 | if ((ch >= 'A') && (ch <= 'F')) | |
306 | return ch - 'A' + 10; | |
307 | return -1; | |
308 | } | |
309 | ||
310 | /* | |
311 | * While we find nice hex chars, build a long_val. | |
312 | * Return number of chars processed. | |
313 | */ | |
314 | int hex2u64(const char *ptr, u64 *long_val) | |
315 | { | |
316 | const char *p = ptr; | |
317 | *long_val = 0; | |
318 | ||
319 | while (*p) { | |
320 | const int hex_val = hex(*p); | |
321 | ||
322 | if (hex_val < 0) | |
323 | break; | |
324 | ||
325 | *long_val = (*long_val << 4) | hex_val; | |
326 | p++; | |
327 | } | |
328 | ||
329 | return p - ptr; | |
330 | } | |
331 | ||
dc4552bf | 332 | /* Obtain a backtrace and print it to stdout. */ |
89fe808a | 333 | #ifdef HAVE_BACKTRACE_SUPPORT |
dc4552bf ACM |
334 | void dump_stack(void) |
335 | { | |
336 | void *array[16]; | |
337 | size_t size = backtrace(array, ARRAY_SIZE(array)); | |
338 | char **strings = backtrace_symbols(array, size); | |
339 | size_t i; | |
340 | ||
341 | printf("Obtained %zd stack frames.\n", size); | |
342 | ||
343 | for (i = 0; i < size; i++) | |
344 | printf("%s\n", strings[i]); | |
345 | ||
346 | free(strings); | |
347 | } | |
c9f08bee IT |
348 | #else |
349 | void dump_stack(void) {} | |
350 | #endif | |
2c803e52 | 351 | |
07c1a0da ACM |
352 | void sighandler_dump_stack(int sig) |
353 | { | |
354 | psignal(sig, "perf"); | |
355 | dump_stack(); | |
356 | exit(sig); | |
357 | } | |
358 | ||
2c803e52 DA |
359 | void get_term_dimensions(struct winsize *ws) |
360 | { | |
361 | char *s = getenv("LINES"); | |
362 | ||
363 | if (s != NULL) { | |
364 | ws->ws_row = atoi(s); | |
365 | s = getenv("COLUMNS"); | |
366 | if (s != NULL) { | |
367 | ws->ws_col = atoi(s); | |
368 | if (ws->ws_row && ws->ws_col) | |
369 | return; | |
370 | } | |
371 | } | |
372 | #ifdef TIOCGWINSZ | |
373 | if (ioctl(1, TIOCGWINSZ, ws) == 0 && | |
374 | ws->ws_row && ws->ws_col) | |
375 | return; | |
376 | #endif | |
377 | ws->ws_row = 25; | |
378 | ws->ws_col = 80; | |
379 | } | |
1355915a | 380 | |
9398c484 JO |
381 | void set_term_quiet_input(struct termios *old) |
382 | { | |
383 | struct termios tc; | |
384 | ||
385 | tcgetattr(0, old); | |
386 | tc = *old; | |
387 | tc.c_lflag &= ~(ICANON | ECHO); | |
388 | tc.c_cc[VMIN] = 0; | |
389 | tc.c_cc[VTIME] = 0; | |
390 | tcsetattr(0, TCSANOW, &tc); | |
391 | } | |
392 | ||
23773ca1 | 393 | static void set_tracing_events_path(const char *tracing, const char *mountpoint) |
1355915a | 394 | { |
9f44f0cc JO |
395 | snprintf(tracing_path, sizeof(tracing_path), "%s/%s", |
396 | mountpoint, tracing); | |
23773ca1 SRRH |
397 | snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s%s", |
398 | mountpoint, tracing, "events"); | |
1355915a BP |
399 | } |
400 | ||
23773ca1 SRRH |
401 | static const char *__perf_tracefs_mount(const char *mountpoint) |
402 | { | |
403 | const char *mnt; | |
404 | ||
405 | mnt = tracefs_mount(mountpoint); | |
406 | if (!mnt) | |
407 | return NULL; | |
408 | ||
409 | set_tracing_events_path("", mnt); | |
410 | ||
411 | return mnt; | |
412 | } | |
413 | ||
414 | static const char *__perf_debugfs_mount(const char *mountpoint) | |
1355915a BP |
415 | { |
416 | const char *mnt; | |
417 | ||
418 | mnt = debugfs_mount(mountpoint); | |
419 | if (!mnt) | |
420 | return NULL; | |
421 | ||
23773ca1 SRRH |
422 | set_tracing_events_path("tracing/", mnt); |
423 | ||
424 | return mnt; | |
425 | } | |
426 | ||
427 | const char *perf_debugfs_mount(const char *mountpoint) | |
428 | { | |
429 | const char *mnt; | |
430 | ||
431 | mnt = __perf_tracefs_mount(mountpoint); | |
432 | if (mnt) | |
433 | return mnt; | |
434 | ||
435 | mnt = __perf_debugfs_mount(mountpoint); | |
1355915a BP |
436 | |
437 | return mnt; | |
438 | } | |
439 | ||
440 | void perf_debugfs_set_path(const char *mntpt) | |
441 | { | |
23773ca1 SRRH |
442 | set_tracing_events_path("tracing/", mntpt); |
443 | } | |
444 | ||
167aedc4 NK |
445 | char *get_tracing_file(const char *name) |
446 | { | |
167aedc4 NK |
447 | char *file; |
448 | ||
9f44f0cc | 449 | if (asprintf(&file, "%s/%s", tracing_path, name) < 0) |
167aedc4 NK |
450 | return NULL; |
451 | ||
167aedc4 NK |
452 | return file; |
453 | } | |
454 | ||
455 | void put_tracing_file(char *file) | |
456 | { | |
457 | free(file); | |
458 | } | |
3b47abe1 NK |
459 | |
460 | int parse_nsec_time(const char *str, u64 *ptime) | |
461 | { | |
462 | u64 time_sec, time_nsec; | |
463 | char *end; | |
464 | ||
465 | time_sec = strtoul(str, &end, 10); | |
466 | if (*end != '.' && *end != '\0') | |
467 | return -1; | |
468 | ||
469 | if (*end == '.') { | |
470 | int i; | |
471 | char nsec_buf[10]; | |
472 | ||
473 | if (strlen(++end) > 9) | |
474 | return -1; | |
475 | ||
476 | strncpy(nsec_buf, end, 9); | |
477 | nsec_buf[9] = '\0'; | |
478 | ||
479 | /* make it nsec precision */ | |
480 | for (i = strlen(nsec_buf); i < 9; i++) | |
481 | nsec_buf[i] = '0'; | |
482 | ||
483 | time_nsec = strtoul(nsec_buf, &end, 10); | |
484 | if (*end != '\0') | |
485 | return -1; | |
486 | } else | |
487 | time_nsec = 0; | |
488 | ||
489 | *ptime = time_sec * NSEC_PER_SEC + time_nsec; | |
490 | return 0; | |
491 | } | |
27050f53 JO |
492 | |
493 | unsigned long parse_tag_value(const char *str, struct parse_tag *tags) | |
494 | { | |
495 | struct parse_tag *i = tags; | |
496 | ||
497 | while (i->tag) { | |
498 | char *s; | |
499 | ||
500 | s = strchr(str, i->tag); | |
501 | if (s) { | |
502 | unsigned long int value; | |
503 | char *endptr; | |
504 | ||
505 | value = strtoul(str, &endptr, 10); | |
506 | if (s != endptr) | |
507 | break; | |
508 | ||
56921bec AH |
509 | if (value > ULONG_MAX / i->mult) |
510 | break; | |
27050f53 JO |
511 | value *= i->mult; |
512 | return value; | |
513 | } | |
514 | i++; | |
515 | } | |
516 | ||
517 | return (unsigned long) -1; | |
518 | } | |
97a07f10 | 519 | |
076a30c4 KL |
520 | int get_stack_size(const char *str, unsigned long *_size) |
521 | { | |
522 | char *endptr; | |
523 | unsigned long size; | |
524 | unsigned long max_size = round_down(USHRT_MAX, sizeof(u64)); | |
525 | ||
526 | size = strtoul(str, &endptr, 0); | |
527 | ||
528 | do { | |
529 | if (*endptr) | |
530 | break; | |
531 | ||
532 | size = round_up(size, sizeof(u64)); | |
533 | if (!size || size > max_size) | |
534 | break; | |
535 | ||
536 | *_size = size; | |
537 | return 0; | |
538 | ||
539 | } while (0); | |
540 | ||
541 | pr_err("callchain: Incorrect stack dump size (max %ld): %s\n", | |
542 | max_size, str); | |
543 | return -1; | |
544 | } | |
545 | ||
546 | int parse_callchain_record(const char *arg, struct callchain_param *param) | |
547 | { | |
548 | char *tok, *name, *saveptr = NULL; | |
549 | char *buf; | |
550 | int ret = -1; | |
551 | ||
552 | /* We need buffer that we know we can write to. */ | |
553 | buf = malloc(strlen(arg) + 1); | |
554 | if (!buf) | |
555 | return -ENOMEM; | |
556 | ||
557 | strcpy(buf, arg); | |
558 | ||
559 | tok = strtok_r((char *)buf, ",", &saveptr); | |
560 | name = tok ? : (char *)buf; | |
561 | ||
562 | do { | |
563 | /* Framepointer style */ | |
564 | if (!strncmp(name, "fp", sizeof("fp"))) { | |
565 | if (!strtok_r(NULL, ",", &saveptr)) { | |
566 | param->record_mode = CALLCHAIN_FP; | |
567 | ret = 0; | |
568 | } else | |
569 | pr_err("callchain: No more arguments " | |
570 | "needed for --call-graph fp\n"); | |
571 | break; | |
572 | ||
573 | #ifdef HAVE_DWARF_UNWIND_SUPPORT | |
574 | /* Dwarf style */ | |
575 | } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) { | |
576 | const unsigned long default_stack_dump_size = 8192; | |
577 | ||
578 | ret = 0; | |
579 | param->record_mode = CALLCHAIN_DWARF; | |
580 | param->dump_size = default_stack_dump_size; | |
581 | ||
582 | tok = strtok_r(NULL, ",", &saveptr); | |
583 | if (tok) { | |
584 | unsigned long size = 0; | |
585 | ||
586 | ret = get_stack_size(tok, &size); | |
587 | param->dump_size = size; | |
588 | } | |
589 | #endif /* HAVE_DWARF_UNWIND_SUPPORT */ | |
590 | } else if (!strncmp(name, "lbr", sizeof("lbr"))) { | |
591 | if (!strtok_r(NULL, ",", &saveptr)) { | |
592 | param->record_mode = CALLCHAIN_LBR; | |
593 | ret = 0; | |
594 | } else | |
595 | pr_err("callchain: No more arguments " | |
596 | "needed for --call-graph lbr\n"); | |
597 | break; | |
598 | } else { | |
599 | pr_err("callchain: Unknown --call-graph option " | |
600 | "value: %s\n", arg); | |
601 | break; | |
602 | } | |
603 | ||
604 | } while (0); | |
605 | ||
606 | free(buf); | |
607 | return ret; | |
608 | } | |
609 | ||
cef82c9f JO |
610 | int filename__read_str(const char *filename, char **buf, size_t *sizep) |
611 | { | |
612 | size_t size = 0, alloc_size = 0; | |
613 | void *bf = NULL, *nbf; | |
614 | int fd, n, err = 0; | |
6e81c74c | 615 | char sbuf[STRERR_BUFSIZE]; |
cef82c9f JO |
616 | |
617 | fd = open(filename, O_RDONLY); | |
618 | if (fd < 0) | |
619 | return -errno; | |
620 | ||
621 | do { | |
622 | if (size == alloc_size) { | |
623 | alloc_size += BUFSIZ; | |
624 | nbf = realloc(bf, alloc_size); | |
625 | if (!nbf) { | |
626 | err = -ENOMEM; | |
627 | break; | |
628 | } | |
629 | ||
630 | bf = nbf; | |
631 | } | |
632 | ||
633 | n = read(fd, bf + size, alloc_size - size); | |
634 | if (n < 0) { | |
635 | if (size) { | |
6e81c74c MH |
636 | pr_warning("read failed %d: %s\n", errno, |
637 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
cef82c9f JO |
638 | err = 0; |
639 | } else | |
640 | err = -errno; | |
641 | ||
642 | break; | |
643 | } | |
644 | ||
645 | size += n; | |
646 | } while (n > 0); | |
647 | ||
648 | if (!err) { | |
649 | *sizep = size; | |
650 | *buf = bf; | |
651 | } else | |
652 | free(bf); | |
653 | ||
654 | close(fd); | |
655 | return err; | |
656 | } | |
e1a2b174 DY |
657 | |
658 | const char *get_filename_for_perf_kvm(void) | |
659 | { | |
660 | const char *filename; | |
661 | ||
662 | if (perf_host && !perf_guest) | |
663 | filename = strdup("perf.data.host"); | |
664 | else if (!perf_host && perf_guest) | |
665 | filename = strdup("perf.data.guest"); | |
666 | else | |
667 | filename = strdup("perf.data.kvm"); | |
668 | ||
669 | return filename; | |
670 | } | |
1a47245d AH |
671 | |
672 | int perf_event_paranoid(void) | |
673 | { | |
1a47245d AH |
674 | int value; |
675 | ||
ce27309f | 676 | if (sysctl__read_int("kernel/perf_event_paranoid", &value)) |
1a47245d AH |
677 | return INT_MAX; |
678 | ||
679 | return value; | |
680 | } | |
71db07b1 AH |
681 | |
682 | void mem_bswap_32(void *src, int byte_size) | |
683 | { | |
684 | u32 *m = src; | |
685 | while (byte_size > 0) { | |
686 | *m = bswap_32(*m); | |
687 | byte_size -= sizeof(u32); | |
688 | ++m; | |
689 | } | |
690 | } | |
691 | ||
692 | void mem_bswap_64(void *src, int byte_size) | |
693 | { | |
694 | u64 *m = src; | |
695 | ||
696 | while (byte_size > 0) { | |
697 | *m = bswap_64(*m); | |
698 | byte_size -= sizeof(u64); | |
699 | ++m; | |
700 | } | |
701 | } | |
63914aca JO |
702 | |
703 | bool find_process(const char *name) | |
704 | { | |
705 | size_t len = strlen(name); | |
706 | DIR *dir; | |
707 | struct dirent *d; | |
708 | int ret = -1; | |
709 | ||
710 | dir = opendir(procfs__mountpoint()); | |
711 | if (!dir) | |
bf644563 | 712 | return false; |
63914aca JO |
713 | |
714 | /* Walk through the directory. */ | |
715 | while (ret && (d = readdir(dir)) != NULL) { | |
716 | char path[PATH_MAX]; | |
717 | char *data; | |
718 | size_t size; | |
719 | ||
720 | if ((d->d_type != DT_DIR) || | |
721 | !strcmp(".", d->d_name) || | |
722 | !strcmp("..", d->d_name)) | |
723 | continue; | |
724 | ||
725 | scnprintf(path, sizeof(path), "%s/%s/comm", | |
726 | procfs__mountpoint(), d->d_name); | |
727 | ||
728 | if (filename__read_str(path, &data, &size)) | |
729 | continue; | |
730 | ||
731 | ret = strncmp(name, data, len); | |
732 | free(data); | |
733 | } | |
734 | ||
735 | closedir(dir); | |
736 | return ret ? false : true; | |
737 | } |