6 #include <sys/utsname.h>
7 #ifdef HAVE_BACKTRACE_SUPPORT
16 #include <linux/kernel.h>
17 #include <linux/log2.h>
18 #include <linux/time64.h>
20 #include "callchain.h"
23 #define CALLCHAIN_PARAM_DEFAULT \
24 .mode = CHAIN_GRAPH_ABS, \
26 .order = ORDER_CALLEE, \
27 .key = CCKEY_FUNCTION, \
28 .value = CCVAL_PERCENT, \
30 struct callchain_param callchain_param = {
31 CALLCHAIN_PARAM_DEFAULT
34 struct callchain_param callchain_param_default = {
35 CALLCHAIN_PARAM_DEFAULT
39 * XXX We need to find a better place for these things...
41 unsigned int page_size;
44 int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
45 int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
47 bool test_attr__enabled;
49 bool perf_host = true;
50 bool perf_guest = false;
52 void event_attr_init(struct perf_event_attr *attr)
55 attr->exclude_host = 1;
57 attr->exclude_guest = 1;
58 /* to capture ABI version */
59 attr->size = sizeof(*attr);
62 int mkdir_p(char *path, mode_t mode)
71 if (stat(path, &st) == 0)
76 while ((d = strchr(d, '/'))) {
78 err = stat(path, &st) && mkdir(path, mode);
85 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
93 char namebuf[PATH_MAX];
99 while ((d = readdir(dir)) != NULL && !ret) {
102 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
105 scnprintf(namebuf, sizeof(namebuf), "%s/%s",
108 /* We have to check symbolic link itself */
109 ret = lstat(namebuf, &statbuf);
111 pr_debug("stat failed: %s\n", namebuf);
115 if (S_ISDIR(statbuf.st_mode))
116 ret = rm_rf(namebuf);
118 ret = unlink(namebuf);
128 /* A filter which removes dot files */
129 bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
131 return d->d_name[0] != '.';
134 /* lsdir reads a directory and store it in strlist */
135 struct strlist *lsdir(const char *name,
136 bool (*filter)(const char *, struct dirent *))
138 struct strlist *list = NULL;
146 list = strlist__new(NULL, NULL);
152 while ((d = readdir(dir)) != NULL) {
153 if (!filter || filter(name, d))
154 strlist__add(list, d->d_name);
162 static int slow_copyfile(const char *from, const char *to)
167 FILE *from_fp = fopen(from, "r"), *to_fp;
172 to_fp = fopen(to, "w");
174 goto out_fclose_from;
176 while (getline(&line, &n, from_fp) > 0)
177 if (fputs(line, to_fp) == EOF)
189 int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
194 pgoff = off_in & ~(page_size - 1);
197 ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
198 if (ptr == MAP_FAILED)
202 ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
203 if (ret < 0 && errno == EINTR)
212 munmap(ptr, off_in + size);
214 return size ? -1 : 0;
217 int copyfile_mode(const char *from, const char *to, mode_t mode)
222 char *tmp = NULL, *ptr = NULL;
227 /* extra 'x' at the end is to reserve space for '.' */
228 if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
232 ptr = strrchr(tmp, '/');
235 ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
242 if (fchmod(tofd, mode))
245 if (st.st_size == 0) { /* /proc? do it slowly... */
246 err = slow_copyfile(from, tmp);
250 fromfd = open(from, O_RDONLY);
254 err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
267 int copyfile(const char *from, const char *to)
269 return copyfile_mode(from, to, 0755);
272 unsigned long convert_unit(unsigned long value, char *unit)
294 static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
296 void *buf_start = buf;
300 ssize_t ret = is_read ? read(fd, buf, left) :
301 write(fd, buf, left);
303 if (ret < 0 && errno == EINTR)
312 BUG_ON((size_t)(buf - buf_start) != n);
317 * Read exactly 'n' bytes or return an error.
319 ssize_t readn(int fd, void *buf, size_t n)
321 return ion(true, fd, buf, n);
325 * Write exactly 'n' bytes or return an error.
327 ssize_t writen(int fd, void *buf, size_t n)
329 return ion(false, fd, buf, n);
332 size_t hex_width(u64 v)
342 static int hex(char ch)
344 if ((ch >= '0') && (ch <= '9'))
346 if ((ch >= 'a') && (ch <= 'f'))
347 return ch - 'a' + 10;
348 if ((ch >= 'A') && (ch <= 'F'))
349 return ch - 'A' + 10;
354 * While we find nice hex chars, build a long_val.
355 * Return number of chars processed.
357 int hex2u64(const char *ptr, u64 *long_val)
363 const int hex_val = hex(*p);
368 *long_val = (*long_val << 4) | hex_val;
375 /* Obtain a backtrace and print it to stdout. */
376 #ifdef HAVE_BACKTRACE_SUPPORT
377 void dump_stack(void)
380 size_t size = backtrace(array, ARRAY_SIZE(array));
381 char **strings = backtrace_symbols(array, size);
384 printf("Obtained %zd stack frames.\n", size);
386 for (i = 0; i < size; i++)
387 printf("%s\n", strings[i]);
392 void dump_stack(void) {}
395 void sighandler_dump_stack(int sig)
397 psignal(sig, "perf");
399 signal(sig, SIG_DFL);
403 int parse_nsec_time(const char *str, u64 *ptime)
405 u64 time_sec, time_nsec;
408 time_sec = strtoul(str, &end, 10);
409 if (*end != '.' && *end != '\0')
416 if (strlen(++end) > 9)
419 strncpy(nsec_buf, end, 9);
422 /* make it nsec precision */
423 for (i = strlen(nsec_buf); i < 9; i++)
426 time_nsec = strtoul(nsec_buf, &end, 10);
432 *ptime = time_sec * NSEC_PER_SEC + time_nsec;
436 unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
438 struct parse_tag *i = tags;
443 s = strchr(str, i->tag);
445 unsigned long int value;
448 value = strtoul(str, &endptr, 10);
452 if (value > ULONG_MAX / i->mult)
460 return (unsigned long) -1;
463 int get_stack_size(const char *str, unsigned long *_size)
467 unsigned long max_size = round_down(USHRT_MAX, sizeof(u64));
469 size = strtoul(str, &endptr, 0);
475 size = round_up(size, sizeof(u64));
476 if (!size || size > max_size)
484 pr_err("callchain: Incorrect stack dump size (max %ld): %s\n",
489 int parse_callchain_record(const char *arg, struct callchain_param *param)
491 char *tok, *name, *saveptr = NULL;
495 /* We need buffer that we know we can write to. */
496 buf = malloc(strlen(arg) + 1);
502 tok = strtok_r((char *)buf, ",", &saveptr);
503 name = tok ? : (char *)buf;
506 /* Framepointer style */
507 if (!strncmp(name, "fp", sizeof("fp"))) {
508 if (!strtok_r(NULL, ",", &saveptr)) {
509 param->record_mode = CALLCHAIN_FP;
512 pr_err("callchain: No more arguments "
513 "needed for --call-graph fp\n");
517 } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
518 const unsigned long default_stack_dump_size = 8192;
521 param->record_mode = CALLCHAIN_DWARF;
522 param->dump_size = default_stack_dump_size;
524 tok = strtok_r(NULL, ",", &saveptr);
526 unsigned long size = 0;
528 ret = get_stack_size(tok, &size);
529 param->dump_size = size;
531 } else if (!strncmp(name, "lbr", sizeof("lbr"))) {
532 if (!strtok_r(NULL, ",", &saveptr)) {
533 param->record_mode = CALLCHAIN_LBR;
536 pr_err("callchain: No more arguments "
537 "needed for --call-graph lbr\n");
540 pr_err("callchain: Unknown --call-graph option "
551 const char *get_filename_for_perf_kvm(void)
553 const char *filename;
555 if (perf_host && !perf_guest)
556 filename = strdup("perf.data.host");
557 else if (!perf_host && perf_guest)
558 filename = strdup("perf.data.guest");
560 filename = strdup("perf.data.kvm");
565 int perf_event_paranoid(void)
569 if (sysctl__read_int("kernel/perf_event_paranoid", &value))
575 void mem_bswap_32(void *src, int byte_size)
578 while (byte_size > 0) {
580 byte_size -= sizeof(u32);
585 void mem_bswap_64(void *src, int byte_size)
589 while (byte_size > 0) {
591 byte_size -= sizeof(u64);
596 bool find_process(const char *name)
598 size_t len = strlen(name);
603 dir = opendir(procfs__mountpoint());
607 /* Walk through the directory. */
608 while (ret && (d = readdir(dir)) != NULL) {
613 if ((d->d_type != DT_DIR) ||
614 !strcmp(".", d->d_name) ||
615 !strcmp("..", d->d_name))
618 scnprintf(path, sizeof(path), "%s/%s/comm",
619 procfs__mountpoint(), d->d_name);
621 if (filename__read_str(path, &data, &size))
624 ret = strncmp(name, data, len);
629 return ret ? false : true;
633 fetch_kernel_version(unsigned int *puint, char *str,
636 struct utsname utsname;
637 int version, patchlevel, sublevel, err;
642 if (str && str_size) {
643 strncpy(str, utsname.release, str_size);
644 str[str_size - 1] = '\0';
647 err = sscanf(utsname.release, "%d.%d.%d",
648 &version, &patchlevel, &sublevel);
651 pr_debug("Unablt to get kernel version from uname '%s'\n",
657 *puint = (version << 16) + (patchlevel << 8) + sublevel;
661 const char *perf_tip(const char *dirpath)
663 struct strlist *tips;
664 struct str_node *node;
666 struct strlist_config conf = {
671 tips = strlist__new("tips.txt", &conf);
673 return errno == ENOENT ? NULL : "Tip: get more memory! ;-p";
675 if (strlist__nr_entries(tips) == 0)
678 node = strlist__entry(tips, random() % strlist__nr_entries(tips));
679 if (asprintf(&tip, "Tip: %s", node->s) < 0)
680 tip = (char *)"Tip: get more memory! ;-)";
683 strlist__delete(tips);
688 bool is_regular_file(const char *file)
695 return S_ISREG(st.st_mode);
698 int fetch_current_timestamp(char *buf, size_t sz)
704 if (gettimeofday(&tv, NULL) || !localtime_r(&tv.tv_sec, &tm))
707 if (!strftime(dt, sizeof(dt), "%Y%m%d%H%M%S", &tm))
710 scnprintf(buf, sz, "%s%02u", dt, (unsigned)tv.tv_usec / 10000);
715 void print_binary(unsigned char *data, size_t len,
716 size_t bytes_per_line, print_binary_t printer,
724 bytes_per_line = roundup_pow_of_two(bytes_per_line);
725 mask = bytes_per_line - 1;
727 printer(BINARY_PRINT_DATA_BEGIN, 0, extra);
728 for (i = 0; i < len; i++) {
729 if ((i & mask) == 0) {
730 printer(BINARY_PRINT_LINE_BEGIN, -1, extra);
731 printer(BINARY_PRINT_ADDR, i, extra);
734 printer(BINARY_PRINT_NUM_DATA, data[i], extra);
736 if (((i & mask) == mask) || i == len - 1) {
737 for (j = 0; j < mask-(i & mask); j++)
738 printer(BINARY_PRINT_NUM_PAD, -1, extra);
740 printer(BINARY_PRINT_SEP, i, extra);
741 for (j = i & ~mask; j <= i; j++)
742 printer(BINARY_PRINT_CHAR_DATA, data[j], extra);
743 for (j = 0; j < mask-(i & mask); j++)
744 printer(BINARY_PRINT_CHAR_PAD, i, extra);
745 printer(BINARY_PRINT_LINE_END, -1, extra);
748 printer(BINARY_PRINT_DATA_END, -1, extra);
751 int is_printable_array(char *p, unsigned int len)
755 if (!p || !len || p[len - 1] != 0)
760 for (i = 0; i < len; i++) {
761 if (!isprint(p[i]) && !isspace(p[i]))