6 #include <sys/utsname.h>
7 #ifdef HAVE_BACKTRACE_SUPPORT
16 #include <linux/kernel.h>
17 #include <linux/log2.h>
19 #include "callchain.h"
22 struct callchain_param callchain_param = {
23 .mode = CHAIN_GRAPH_ABS,
25 .order = ORDER_CALLEE,
26 .key = CCKEY_FUNCTION,
27 .value = CCVAL_PERCENT,
31 * XXX We need to find a better place for these things...
33 unsigned int page_size;
36 unsigned int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
38 bool test_attr__enabled;
40 bool perf_host = true;
41 bool perf_guest = false;
43 void event_attr_init(struct perf_event_attr *attr)
46 attr->exclude_host = 1;
48 attr->exclude_guest = 1;
49 /* to capture ABI version */
50 attr->size = sizeof(*attr);
53 int mkdir_p(char *path, mode_t mode)
62 if (stat(path, &st) == 0)
67 while ((d = strchr(d, '/'))) {
69 err = stat(path, &st) && mkdir(path, mode);
76 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
84 char namebuf[PATH_MAX];
90 while ((d = readdir(dir)) != NULL && !ret) {
93 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
96 scnprintf(namebuf, sizeof(namebuf), "%s/%s",
99 ret = stat(namebuf, &statbuf);
101 pr_debug("stat failed: %s\n", namebuf);
105 if (S_ISREG(statbuf.st_mode))
106 ret = unlink(namebuf);
107 else if (S_ISDIR(statbuf.st_mode))
108 ret = rm_rf(namebuf);
110 pr_debug("unknown file: %s\n", namebuf);
122 /* A filter which removes dot files */
123 bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
125 return d->d_name[0] != '.';
128 /* lsdir reads a directory and store it in strlist */
129 struct strlist *lsdir(const char *name,
130 bool (*filter)(const char *, struct dirent *))
132 struct strlist *list = NULL;
140 list = strlist__new(NULL, NULL);
146 while ((d = readdir(dir)) != NULL) {
147 if (!filter || filter(name, d))
148 strlist__add(list, d->d_name);
156 static int slow_copyfile(const char *from, const char *to)
161 FILE *from_fp = fopen(from, "r"), *to_fp;
166 to_fp = fopen(to, "w");
168 goto out_fclose_from;
170 while (getline(&line, &n, from_fp) > 0)
171 if (fputs(line, to_fp) == EOF)
183 int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
188 pgoff = off_in & ~(page_size - 1);
191 ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
192 if (ptr == MAP_FAILED)
196 ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
197 if (ret < 0 && errno == EINTR)
206 munmap(ptr, off_in + size);
208 return size ? -1 : 0;
211 int copyfile_mode(const char *from, const char *to, mode_t mode)
216 char *tmp = NULL, *ptr = NULL;
221 /* extra 'x' at the end is to reserve space for '.' */
222 if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
226 ptr = strrchr(tmp, '/');
229 ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
236 if (fchmod(tofd, mode))
239 if (st.st_size == 0) { /* /proc? do it slowly... */
240 err = slow_copyfile(from, tmp);
244 fromfd = open(from, O_RDONLY);
248 err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
261 int copyfile(const char *from, const char *to)
263 return copyfile_mode(from, to, 0755);
266 unsigned long convert_unit(unsigned long value, char *unit)
288 static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
290 void *buf_start = buf;
294 ssize_t ret = is_read ? read(fd, buf, left) :
295 write(fd, buf, left);
297 if (ret < 0 && errno == EINTR)
306 BUG_ON((size_t)(buf - buf_start) != n);
311 * Read exactly 'n' bytes or return an error.
313 ssize_t readn(int fd, void *buf, size_t n)
315 return ion(true, fd, buf, n);
319 * Write exactly 'n' bytes or return an error.
321 ssize_t writen(int fd, void *buf, size_t n)
323 return ion(false, fd, buf, n);
326 size_t hex_width(u64 v)
336 static int hex(char ch)
338 if ((ch >= '0') && (ch <= '9'))
340 if ((ch >= 'a') && (ch <= 'f'))
341 return ch - 'a' + 10;
342 if ((ch >= 'A') && (ch <= 'F'))
343 return ch - 'A' + 10;
348 * While we find nice hex chars, build a long_val.
349 * Return number of chars processed.
351 int hex2u64(const char *ptr, u64 *long_val)
357 const int hex_val = hex(*p);
362 *long_val = (*long_val << 4) | hex_val;
369 /* Obtain a backtrace and print it to stdout. */
370 #ifdef HAVE_BACKTRACE_SUPPORT
371 void dump_stack(void)
374 size_t size = backtrace(array, ARRAY_SIZE(array));
375 char **strings = backtrace_symbols(array, size);
378 printf("Obtained %zd stack frames.\n", size);
380 for (i = 0; i < size; i++)
381 printf("%s\n", strings[i]);
386 void dump_stack(void) {}
389 void sighandler_dump_stack(int sig)
391 psignal(sig, "perf");
393 signal(sig, SIG_DFL);
397 int parse_nsec_time(const char *str, u64 *ptime)
399 u64 time_sec, time_nsec;
402 time_sec = strtoul(str, &end, 10);
403 if (*end != '.' && *end != '\0')
410 if (strlen(++end) > 9)
413 strncpy(nsec_buf, end, 9);
416 /* make it nsec precision */
417 for (i = strlen(nsec_buf); i < 9; i++)
420 time_nsec = strtoul(nsec_buf, &end, 10);
426 *ptime = time_sec * NSEC_PER_SEC + time_nsec;
430 unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
432 struct parse_tag *i = tags;
437 s = strchr(str, i->tag);
439 unsigned long int value;
442 value = strtoul(str, &endptr, 10);
446 if (value > ULONG_MAX / i->mult)
454 return (unsigned long) -1;
457 int get_stack_size(const char *str, unsigned long *_size)
461 unsigned long max_size = round_down(USHRT_MAX, sizeof(u64));
463 size = strtoul(str, &endptr, 0);
469 size = round_up(size, sizeof(u64));
470 if (!size || size > max_size)
478 pr_err("callchain: Incorrect stack dump size (max %ld): %s\n",
483 int parse_callchain_record(const char *arg, struct callchain_param *param)
485 char *tok, *name, *saveptr = NULL;
489 /* We need buffer that we know we can write to. */
490 buf = malloc(strlen(arg) + 1);
496 tok = strtok_r((char *)buf, ",", &saveptr);
497 name = tok ? : (char *)buf;
500 /* Framepointer style */
501 if (!strncmp(name, "fp", sizeof("fp"))) {
502 if (!strtok_r(NULL, ",", &saveptr)) {
503 param->record_mode = CALLCHAIN_FP;
506 pr_err("callchain: No more arguments "
507 "needed for --call-graph fp\n");
510 #ifdef HAVE_DWARF_UNWIND_SUPPORT
512 } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
513 const unsigned long default_stack_dump_size = 8192;
516 param->record_mode = CALLCHAIN_DWARF;
517 param->dump_size = default_stack_dump_size;
519 tok = strtok_r(NULL, ",", &saveptr);
521 unsigned long size = 0;
523 ret = get_stack_size(tok, &size);
524 param->dump_size = size;
526 #endif /* HAVE_DWARF_UNWIND_SUPPORT */
527 } else if (!strncmp(name, "lbr", sizeof("lbr"))) {
528 if (!strtok_r(NULL, ",", &saveptr)) {
529 param->record_mode = CALLCHAIN_LBR;
532 pr_err("callchain: No more arguments "
533 "needed for --call-graph lbr\n");
536 pr_err("callchain: Unknown --call-graph option "
547 const char *get_filename_for_perf_kvm(void)
549 const char *filename;
551 if (perf_host && !perf_guest)
552 filename = strdup("perf.data.host");
553 else if (!perf_host && perf_guest)
554 filename = strdup("perf.data.guest");
556 filename = strdup("perf.data.kvm");
561 int perf_event_paranoid(void)
565 if (sysctl__read_int("kernel/perf_event_paranoid", &value))
571 void mem_bswap_32(void *src, int byte_size)
574 while (byte_size > 0) {
576 byte_size -= sizeof(u32);
581 void mem_bswap_64(void *src, int byte_size)
585 while (byte_size > 0) {
587 byte_size -= sizeof(u64);
592 bool find_process(const char *name)
594 size_t len = strlen(name);
599 dir = opendir(procfs__mountpoint());
603 /* Walk through the directory. */
604 while (ret && (d = readdir(dir)) != NULL) {
609 if ((d->d_type != DT_DIR) ||
610 !strcmp(".", d->d_name) ||
611 !strcmp("..", d->d_name))
614 scnprintf(path, sizeof(path), "%s/%s/comm",
615 procfs__mountpoint(), d->d_name);
617 if (filename__read_str(path, &data, &size))
620 ret = strncmp(name, data, len);
625 return ret ? false : true;
629 fetch_kernel_version(unsigned int *puint, char *str,
632 struct utsname utsname;
633 int version, patchlevel, sublevel, err;
638 if (str && str_size) {
639 strncpy(str, utsname.release, str_size);
640 str[str_size - 1] = '\0';
643 err = sscanf(utsname.release, "%d.%d.%d",
644 &version, &patchlevel, &sublevel);
647 pr_debug("Unablt to get kernel version from uname '%s'\n",
653 *puint = (version << 16) + (patchlevel << 8) + sublevel;
657 const char *perf_tip(const char *dirpath)
659 struct strlist *tips;
660 struct str_node *node;
662 struct strlist_config conf = {
667 tips = strlist__new("tips.txt", &conf);
669 return errno == ENOENT ? NULL : "Tip: get more memory! ;-p";
671 if (strlist__nr_entries(tips) == 0)
674 node = strlist__entry(tips, random() % strlist__nr_entries(tips));
675 if (asprintf(&tip, "Tip: %s", node->s) < 0)
676 tip = (char *)"Tip: get more memory! ;-)";
679 strlist__delete(tips);
684 bool is_regular_file(const char *file)
691 return S_ISREG(st.st_mode);
694 int fetch_current_timestamp(char *buf, size_t sz)
700 if (gettimeofday(&tv, NULL) || !localtime_r(&tv.tv_sec, &tm))
703 if (!strftime(dt, sizeof(dt), "%Y%m%d%H%M%S", &tm))
706 scnprintf(buf, sz, "%s%02u", dt, (unsigned)tv.tv_usec / 10000);
711 void print_binary(unsigned char *data, size_t len,
712 size_t bytes_per_line, print_binary_t printer,
720 bytes_per_line = roundup_pow_of_two(bytes_per_line);
721 mask = bytes_per_line - 1;
723 printer(BINARY_PRINT_DATA_BEGIN, 0, extra);
724 for (i = 0; i < len; i++) {
725 if ((i & mask) == 0) {
726 printer(BINARY_PRINT_LINE_BEGIN, -1, extra);
727 printer(BINARY_PRINT_ADDR, i, extra);
730 printer(BINARY_PRINT_NUM_DATA, data[i], extra);
732 if (((i & mask) == mask) || i == len - 1) {
733 for (j = 0; j < mask-(i & mask); j++)
734 printer(BINARY_PRINT_NUM_PAD, -1, extra);
736 printer(BINARY_PRINT_SEP, i, extra);
737 for (j = i & ~mask; j <= i; j++)
738 printer(BINARY_PRINT_CHAR_DATA, data[j], extra);
739 for (j = 0; j < mask-(i & mask); j++)
740 printer(BINARY_PRINT_CHAR_PAD, i, extra);
741 printer(BINARY_PRINT_LINE_END, -1, extra);
744 printer(BINARY_PRINT_DATA_END, -1, extra);