6 #include <sys/utsname.h>
7 #ifdef HAVE_BACKTRACE_SUPPORT
16 #include <linux/kernel.h>
18 #include "callchain.h"
21 struct callchain_param callchain_param = {
22 .mode = CHAIN_GRAPH_ABS,
24 .order = ORDER_CALLEE,
25 .key = CCKEY_FUNCTION,
26 .value = CCVAL_PERCENT,
30 * XXX We need to find a better place for these things...
32 unsigned int page_size;
35 bool test_attr__enabled;
37 bool perf_host = true;
38 bool perf_guest = false;
40 void event_attr_init(struct perf_event_attr *attr)
43 attr->exclude_host = 1;
45 attr->exclude_guest = 1;
46 /* to capture ABI version */
47 attr->size = sizeof(*attr);
50 int mkdir_p(char *path, mode_t mode)
59 if (stat(path, &st) == 0)
64 while ((d = strchr(d, '/'))) {
66 err = stat(path, &st) && mkdir(path, mode);
73 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
81 char namebuf[PATH_MAX];
87 while ((d = readdir(dir)) != NULL && !ret) {
90 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
93 scnprintf(namebuf, sizeof(namebuf), "%s/%s",
96 ret = stat(namebuf, &statbuf);
98 pr_debug("stat failed: %s\n", namebuf);
102 if (S_ISREG(statbuf.st_mode))
103 ret = unlink(namebuf);
104 else if (S_ISDIR(statbuf.st_mode))
105 ret = rm_rf(namebuf);
107 pr_debug("unknown file: %s\n", namebuf);
119 static int slow_copyfile(const char *from, const char *to)
124 FILE *from_fp = fopen(from, "r"), *to_fp;
129 to_fp = fopen(to, "w");
131 goto out_fclose_from;
133 while (getline(&line, &n, from_fp) > 0)
134 if (fputs(line, to_fp) == EOF)
146 int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
151 pgoff = off_in & ~(page_size - 1);
154 ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
155 if (ptr == MAP_FAILED)
159 ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
160 if (ret < 0 && errno == EINTR)
169 munmap(ptr, off_in + size);
171 return size ? -1 : 0;
174 int copyfile_mode(const char *from, const char *to, mode_t mode)
179 char *tmp = NULL, *ptr = NULL;
184 /* extra 'x' at the end is to reserve space for '.' */
185 if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
189 ptr = strrchr(tmp, '/');
192 ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
199 if (fchmod(tofd, mode))
202 if (st.st_size == 0) { /* /proc? do it slowly... */
203 err = slow_copyfile(from, tmp);
207 fromfd = open(from, O_RDONLY);
211 err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
224 int copyfile(const char *from, const char *to)
226 return copyfile_mode(from, to, 0755);
229 unsigned long convert_unit(unsigned long value, char *unit)
251 static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
253 void *buf_start = buf;
257 ssize_t ret = is_read ? read(fd, buf, left) :
258 write(fd, buf, left);
260 if (ret < 0 && errno == EINTR)
269 BUG_ON((size_t)(buf - buf_start) != n);
274 * Read exactly 'n' bytes or return an error.
276 ssize_t readn(int fd, void *buf, size_t n)
278 return ion(true, fd, buf, n);
282 * Write exactly 'n' bytes or return an error.
284 ssize_t writen(int fd, void *buf, size_t n)
286 return ion(false, fd, buf, n);
289 size_t hex_width(u64 v)
299 static int hex(char ch)
301 if ((ch >= '0') && (ch <= '9'))
303 if ((ch >= 'a') && (ch <= 'f'))
304 return ch - 'a' + 10;
305 if ((ch >= 'A') && (ch <= 'F'))
306 return ch - 'A' + 10;
311 * While we find nice hex chars, build a long_val.
312 * Return number of chars processed.
314 int hex2u64(const char *ptr, u64 *long_val)
320 const int hex_val = hex(*p);
325 *long_val = (*long_val << 4) | hex_val;
332 /* Obtain a backtrace and print it to stdout. */
333 #ifdef HAVE_BACKTRACE_SUPPORT
334 void dump_stack(void)
337 size_t size = backtrace(array, ARRAY_SIZE(array));
338 char **strings = backtrace_symbols(array, size);
341 printf("Obtained %zd stack frames.\n", size);
343 for (i = 0; i < size; i++)
344 printf("%s\n", strings[i]);
349 void dump_stack(void) {}
352 void sighandler_dump_stack(int sig)
354 psignal(sig, "perf");
356 signal(sig, SIG_DFL);
360 int parse_nsec_time(const char *str, u64 *ptime)
362 u64 time_sec, time_nsec;
365 time_sec = strtoul(str, &end, 10);
366 if (*end != '.' && *end != '\0')
373 if (strlen(++end) > 9)
376 strncpy(nsec_buf, end, 9);
379 /* make it nsec precision */
380 for (i = strlen(nsec_buf); i < 9; i++)
383 time_nsec = strtoul(nsec_buf, &end, 10);
389 *ptime = time_sec * NSEC_PER_SEC + time_nsec;
393 unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
395 struct parse_tag *i = tags;
400 s = strchr(str, i->tag);
402 unsigned long int value;
405 value = strtoul(str, &endptr, 10);
409 if (value > ULONG_MAX / i->mult)
417 return (unsigned long) -1;
420 int get_stack_size(const char *str, unsigned long *_size)
424 unsigned long max_size = round_down(USHRT_MAX, sizeof(u64));
426 size = strtoul(str, &endptr, 0);
432 size = round_up(size, sizeof(u64));
433 if (!size || size > max_size)
441 pr_err("callchain: Incorrect stack dump size (max %ld): %s\n",
446 int parse_callchain_record(const char *arg, struct callchain_param *param)
448 char *tok, *name, *saveptr = NULL;
452 /* We need buffer that we know we can write to. */
453 buf = malloc(strlen(arg) + 1);
459 tok = strtok_r((char *)buf, ",", &saveptr);
460 name = tok ? : (char *)buf;
463 /* Framepointer style */
464 if (!strncmp(name, "fp", sizeof("fp"))) {
465 if (!strtok_r(NULL, ",", &saveptr)) {
466 param->record_mode = CALLCHAIN_FP;
469 pr_err("callchain: No more arguments "
470 "needed for --call-graph fp\n");
473 #ifdef HAVE_DWARF_UNWIND_SUPPORT
475 } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
476 const unsigned long default_stack_dump_size = 8192;
479 param->record_mode = CALLCHAIN_DWARF;
480 param->dump_size = default_stack_dump_size;
482 tok = strtok_r(NULL, ",", &saveptr);
484 unsigned long size = 0;
486 ret = get_stack_size(tok, &size);
487 param->dump_size = size;
489 #endif /* HAVE_DWARF_UNWIND_SUPPORT */
490 } else if (!strncmp(name, "lbr", sizeof("lbr"))) {
491 if (!strtok_r(NULL, ",", &saveptr)) {
492 param->record_mode = CALLCHAIN_LBR;
495 pr_err("callchain: No more arguments "
496 "needed for --call-graph lbr\n");
499 pr_err("callchain: Unknown --call-graph option "
510 int filename__read_str(const char *filename, char **buf, size_t *sizep)
512 size_t size = 0, alloc_size = 0;
513 void *bf = NULL, *nbf;
515 char sbuf[STRERR_BUFSIZE];
517 fd = open(filename, O_RDONLY);
522 if (size == alloc_size) {
523 alloc_size += BUFSIZ;
524 nbf = realloc(bf, alloc_size);
533 n = read(fd, bf + size, alloc_size - size);
536 pr_warning("read failed %d: %s\n", errno,
537 strerror_r(errno, sbuf, sizeof(sbuf)));
558 const char *get_filename_for_perf_kvm(void)
560 const char *filename;
562 if (perf_host && !perf_guest)
563 filename = strdup("perf.data.host");
564 else if (!perf_host && perf_guest)
565 filename = strdup("perf.data.guest");
567 filename = strdup("perf.data.kvm");
572 int perf_event_paranoid(void)
576 if (sysctl__read_int("kernel/perf_event_paranoid", &value))
582 void mem_bswap_32(void *src, int byte_size)
585 while (byte_size > 0) {
587 byte_size -= sizeof(u32);
592 void mem_bswap_64(void *src, int byte_size)
596 while (byte_size > 0) {
598 byte_size -= sizeof(u64);
603 bool find_process(const char *name)
605 size_t len = strlen(name);
610 dir = opendir(procfs__mountpoint());
614 /* Walk through the directory. */
615 while (ret && (d = readdir(dir)) != NULL) {
620 if ((d->d_type != DT_DIR) ||
621 !strcmp(".", d->d_name) ||
622 !strcmp("..", d->d_name))
625 scnprintf(path, sizeof(path), "%s/%s/comm",
626 procfs__mountpoint(), d->d_name);
628 if (filename__read_str(path, &data, &size))
631 ret = strncmp(name, data, len);
636 return ret ? false : true;
640 fetch_kernel_version(unsigned int *puint, char *str,
643 struct utsname utsname;
644 int version, patchlevel, sublevel, err;
649 if (str && str_size) {
650 strncpy(str, utsname.release, str_size);
651 str[str_size - 1] = '\0';
654 err = sscanf(utsname.release, "%d.%d.%d",
655 &version, &patchlevel, &sublevel);
658 pr_debug("Unablt to get kernel version from uname '%s'\n",
664 *puint = (version << 16) + (patchlevel << 8) + sublevel;
668 const char *perf_tip(const char *dirpath)
670 struct strlist *tips;
671 struct str_node *node;
673 struct strlist_config conf = {
678 tips = strlist__new("tips.txt", &conf);
680 return errno == ENOENT ? NULL : "Tip: get more memory! ;-p";
682 if (strlist__nr_entries(tips) == 0)
685 node = strlist__entry(tips, random() % strlist__nr_entries(tips));
686 if (asprintf(&tip, "Tip: %s", node->s) < 0)
687 tip = (char *)"Tip: get more memory! ;-)";
690 strlist__delete(tips);