6 #ifdef HAVE_BACKTRACE_SUPPORT
15 #include <linux/kernel.h>
17 #include "callchain.h"
19 struct callchain_param callchain_param = {
20 .mode = CHAIN_GRAPH_REL,
22 .order = ORDER_CALLEE,
27 * XXX We need to find a better place for these things...
29 unsigned int page_size;
32 bool test_attr__enabled;
34 bool perf_host = true;
35 bool perf_guest = false;
37 char tracing_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing";
38 char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events";
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");
359 void get_term_dimensions(struct winsize *ws)
361 char *s = getenv("LINES");
364 ws->ws_row = atoi(s);
365 s = getenv("COLUMNS");
367 ws->ws_col = atoi(s);
368 if (ws->ws_row && ws->ws_col)
373 if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
374 ws->ws_row && ws->ws_col)
381 void set_term_quiet_input(struct termios *old)
387 tc.c_lflag &= ~(ICANON | ECHO);
390 tcsetattr(0, TCSANOW, &tc);
393 static void set_tracing_events_path(const char *tracing, const char *mountpoint)
395 snprintf(tracing_path, sizeof(tracing_path), "%s/%s",
396 mountpoint, tracing);
397 snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s%s",
398 mountpoint, tracing, "events");
401 static const char *__perf_tracefs_mount(const char *mountpoint)
405 mnt = tracefs_mount(mountpoint);
409 set_tracing_events_path("", mnt);
414 static const char *__perf_debugfs_mount(const char *mountpoint)
418 mnt = debugfs_mount(mountpoint);
422 set_tracing_events_path("tracing/", mnt);
427 const char *perf_debugfs_mount(const char *mountpoint)
431 mnt = __perf_tracefs_mount(mountpoint);
435 mnt = __perf_debugfs_mount(mountpoint);
440 void perf_debugfs_set_path(const char *mntpt)
442 set_tracing_events_path("tracing/", mntpt);
445 char *get_tracing_file(const char *name)
449 if (asprintf(&file, "%s/%s", tracing_path, name) < 0)
455 void put_tracing_file(char *file)
460 int parse_nsec_time(const char *str, u64 *ptime)
462 u64 time_sec, time_nsec;
465 time_sec = strtoul(str, &end, 10);
466 if (*end != '.' && *end != '\0')
473 if (strlen(++end) > 9)
476 strncpy(nsec_buf, end, 9);
479 /* make it nsec precision */
480 for (i = strlen(nsec_buf); i < 9; i++)
483 time_nsec = strtoul(nsec_buf, &end, 10);
489 *ptime = time_sec * NSEC_PER_SEC + time_nsec;
493 unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
495 struct parse_tag *i = tags;
500 s = strchr(str, i->tag);
502 unsigned long int value;
505 value = strtoul(str, &endptr, 10);
509 if (value > ULONG_MAX / i->mult)
517 return (unsigned long) -1;
520 int get_stack_size(const char *str, unsigned long *_size)
524 unsigned long max_size = round_down(USHRT_MAX, sizeof(u64));
526 size = strtoul(str, &endptr, 0);
532 size = round_up(size, sizeof(u64));
533 if (!size || size > max_size)
541 pr_err("callchain: Incorrect stack dump size (max %ld): %s\n",
546 int parse_callchain_record(const char *arg, struct callchain_param *param)
548 char *tok, *name, *saveptr = NULL;
552 /* We need buffer that we know we can write to. */
553 buf = malloc(strlen(arg) + 1);
559 tok = strtok_r((char *)buf, ",", &saveptr);
560 name = tok ? : (char *)buf;
563 /* Framepointer style */
564 if (!strncmp(name, "fp", sizeof("fp"))) {
565 if (!strtok_r(NULL, ",", &saveptr)) {
566 param->record_mode = CALLCHAIN_FP;
569 pr_err("callchain: No more arguments "
570 "needed for --call-graph fp\n");
573 #ifdef HAVE_DWARF_UNWIND_SUPPORT
575 } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
576 const unsigned long default_stack_dump_size = 8192;
579 param->record_mode = CALLCHAIN_DWARF;
580 param->dump_size = default_stack_dump_size;
582 tok = strtok_r(NULL, ",", &saveptr);
584 unsigned long size = 0;
586 ret = get_stack_size(tok, &size);
587 param->dump_size = size;
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;
595 pr_err("callchain: No more arguments "
596 "needed for --call-graph lbr\n");
599 pr_err("callchain: Unknown --call-graph option "
610 int filename__read_str(const char *filename, char **buf, size_t *sizep)
612 size_t size = 0, alloc_size = 0;
613 void *bf = NULL, *nbf;
615 char sbuf[STRERR_BUFSIZE];
617 fd = open(filename, O_RDONLY);
622 if (size == alloc_size) {
623 alloc_size += BUFSIZ;
624 nbf = realloc(bf, alloc_size);
633 n = read(fd, bf + size, alloc_size - size);
636 pr_warning("read failed %d: %s\n", errno,
637 strerror_r(errno, sbuf, sizeof(sbuf)));
658 const char *get_filename_for_perf_kvm(void)
660 const char *filename;
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");
667 filename = strdup("perf.data.kvm");
672 int perf_event_paranoid(void)
676 if (sysctl__read_int("kernel/perf_event_paranoid", &value))
682 void mem_bswap_32(void *src, int byte_size)
685 while (byte_size > 0) {
687 byte_size -= sizeof(u32);
692 void mem_bswap_64(void *src, int byte_size)
696 while (byte_size > 0) {
698 byte_size -= sizeof(u64);
703 bool find_process(const char *name)
705 size_t len = strlen(name);
710 dir = opendir(procfs__mountpoint());
714 /* Walk through the directory. */
715 while (ret && (d = readdir(dir)) != NULL) {
720 if ((d->d_type != DT_DIR) ||
721 !strcmp(".", d->d_name) ||
722 !strcmp("..", d->d_name))
725 scnprintf(path, sizeof(path), "%s/%s/comm",
726 procfs__mountpoint(), d->d_name);
728 if (filename__read_str(path, &data, &size))
731 ret = strncmp(name, data, len);
736 return ret ? false : true;