6 #include <sys/utsname.h>
7 #ifdef HAVE_BACKTRACE_SUPPORT
16 #include <linux/kernel.h>
18 #include "callchain.h"
20 struct callchain_param callchain_param = {
21 .mode = CHAIN_GRAPH_ABS,
23 .order = ORDER_CALLEE,
24 .key = CCKEY_FUNCTION,
25 .value = CCVAL_PERCENT,
29 * XXX We need to find a better place for these things...
31 unsigned int page_size;
34 bool test_attr__enabled;
36 bool perf_host = true;
37 bool perf_guest = false;
39 void event_attr_init(struct perf_event_attr *attr)
42 attr->exclude_host = 1;
44 attr->exclude_guest = 1;
45 /* to capture ABI version */
46 attr->size = sizeof(*attr);
49 int mkdir_p(char *path, mode_t mode)
58 if (stat(path, &st) == 0)
63 while ((d = strchr(d, '/'))) {
65 err = stat(path, &st) && mkdir(path, mode);
72 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
80 char namebuf[PATH_MAX];
86 while ((d = readdir(dir)) != NULL && !ret) {
89 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
92 scnprintf(namebuf, sizeof(namebuf), "%s/%s",
95 ret = stat(namebuf, &statbuf);
97 pr_debug("stat failed: %s\n", namebuf);
101 if (S_ISREG(statbuf.st_mode))
102 ret = unlink(namebuf);
103 else if (S_ISDIR(statbuf.st_mode))
104 ret = rm_rf(namebuf);
106 pr_debug("unknown file: %s\n", namebuf);
118 static int slow_copyfile(const char *from, const char *to)
123 FILE *from_fp = fopen(from, "r"), *to_fp;
128 to_fp = fopen(to, "w");
130 goto out_fclose_from;
132 while (getline(&line, &n, from_fp) > 0)
133 if (fputs(line, to_fp) == EOF)
145 int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
150 pgoff = off_in & ~(page_size - 1);
153 ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
154 if (ptr == MAP_FAILED)
158 ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
159 if (ret < 0 && errno == EINTR)
168 munmap(ptr, off_in + size);
170 return size ? -1 : 0;
173 int copyfile_mode(const char *from, const char *to, mode_t mode)
178 char *tmp = NULL, *ptr = NULL;
183 /* extra 'x' at the end is to reserve space for '.' */
184 if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
188 ptr = strrchr(tmp, '/');
191 ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
198 if (fchmod(tofd, mode))
201 if (st.st_size == 0) { /* /proc? do it slowly... */
202 err = slow_copyfile(from, tmp);
206 fromfd = open(from, O_RDONLY);
210 err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
223 int copyfile(const char *from, const char *to)
225 return copyfile_mode(from, to, 0755);
228 unsigned long convert_unit(unsigned long value, char *unit)
250 static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
252 void *buf_start = buf;
256 ssize_t ret = is_read ? read(fd, buf, left) :
257 write(fd, buf, left);
259 if (ret < 0 && errno == EINTR)
268 BUG_ON((size_t)(buf - buf_start) != n);
273 * Read exactly 'n' bytes or return an error.
275 ssize_t readn(int fd, void *buf, size_t n)
277 return ion(true, fd, buf, n);
281 * Write exactly 'n' bytes or return an error.
283 ssize_t writen(int fd, void *buf, size_t n)
285 return ion(false, fd, buf, n);
288 size_t hex_width(u64 v)
298 static int hex(char ch)
300 if ((ch >= '0') && (ch <= '9'))
302 if ((ch >= 'a') && (ch <= 'f'))
303 return ch - 'a' + 10;
304 if ((ch >= 'A') && (ch <= 'F'))
305 return ch - 'A' + 10;
310 * While we find nice hex chars, build a long_val.
311 * Return number of chars processed.
313 int hex2u64(const char *ptr, u64 *long_val)
319 const int hex_val = hex(*p);
324 *long_val = (*long_val << 4) | hex_val;
331 /* Obtain a backtrace and print it to stdout. */
332 #ifdef HAVE_BACKTRACE_SUPPORT
333 void dump_stack(void)
336 size_t size = backtrace(array, ARRAY_SIZE(array));
337 char **strings = backtrace_symbols(array, size);
340 printf("Obtained %zd stack frames.\n", size);
342 for (i = 0; i < size; i++)
343 printf("%s\n", strings[i]);
348 void dump_stack(void) {}
351 void sighandler_dump_stack(int sig)
353 psignal(sig, "perf");
358 int parse_nsec_time(const char *str, u64 *ptime)
360 u64 time_sec, time_nsec;
363 time_sec = strtoul(str, &end, 10);
364 if (*end != '.' && *end != '\0')
371 if (strlen(++end) > 9)
374 strncpy(nsec_buf, end, 9);
377 /* make it nsec precision */
378 for (i = strlen(nsec_buf); i < 9; i++)
381 time_nsec = strtoul(nsec_buf, &end, 10);
387 *ptime = time_sec * NSEC_PER_SEC + time_nsec;
391 unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
393 struct parse_tag *i = tags;
398 s = strchr(str, i->tag);
400 unsigned long int value;
403 value = strtoul(str, &endptr, 10);
407 if (value > ULONG_MAX / i->mult)
415 return (unsigned long) -1;
418 int get_stack_size(const char *str, unsigned long *_size)
422 unsigned long max_size = round_down(USHRT_MAX, sizeof(u64));
424 size = strtoul(str, &endptr, 0);
430 size = round_up(size, sizeof(u64));
431 if (!size || size > max_size)
439 pr_err("callchain: Incorrect stack dump size (max %ld): %s\n",
444 int parse_callchain_record(const char *arg, struct callchain_param *param)
446 char *tok, *name, *saveptr = NULL;
450 /* We need buffer that we know we can write to. */
451 buf = malloc(strlen(arg) + 1);
457 tok = strtok_r((char *)buf, ",", &saveptr);
458 name = tok ? : (char *)buf;
461 /* Framepointer style */
462 if (!strncmp(name, "fp", sizeof("fp"))) {
463 if (!strtok_r(NULL, ",", &saveptr)) {
464 param->record_mode = CALLCHAIN_FP;
467 pr_err("callchain: No more arguments "
468 "needed for --call-graph fp\n");
471 #ifdef HAVE_DWARF_UNWIND_SUPPORT
473 } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
474 const unsigned long default_stack_dump_size = 8192;
477 param->record_mode = CALLCHAIN_DWARF;
478 param->dump_size = default_stack_dump_size;
480 tok = strtok_r(NULL, ",", &saveptr);
482 unsigned long size = 0;
484 ret = get_stack_size(tok, &size);
485 param->dump_size = size;
487 #endif /* HAVE_DWARF_UNWIND_SUPPORT */
488 } else if (!strncmp(name, "lbr", sizeof("lbr"))) {
489 if (!strtok_r(NULL, ",", &saveptr)) {
490 param->record_mode = CALLCHAIN_LBR;
493 pr_err("callchain: No more arguments "
494 "needed for --call-graph lbr\n");
497 pr_err("callchain: Unknown --call-graph option "
508 int filename__read_str(const char *filename, char **buf, size_t *sizep)
510 size_t size = 0, alloc_size = 0;
511 void *bf = NULL, *nbf;
513 char sbuf[STRERR_BUFSIZE];
515 fd = open(filename, O_RDONLY);
520 if (size == alloc_size) {
521 alloc_size += BUFSIZ;
522 nbf = realloc(bf, alloc_size);
531 n = read(fd, bf + size, alloc_size - size);
534 pr_warning("read failed %d: %s\n", errno,
535 strerror_r(errno, sbuf, sizeof(sbuf)));
556 const char *get_filename_for_perf_kvm(void)
558 const char *filename;
560 if (perf_host && !perf_guest)
561 filename = strdup("perf.data.host");
562 else if (!perf_host && perf_guest)
563 filename = strdup("perf.data.guest");
565 filename = strdup("perf.data.kvm");
570 int perf_event_paranoid(void)
574 if (sysctl__read_int("kernel/perf_event_paranoid", &value))
580 void mem_bswap_32(void *src, int byte_size)
583 while (byte_size > 0) {
585 byte_size -= sizeof(u32);
590 void mem_bswap_64(void *src, int byte_size)
594 while (byte_size > 0) {
596 byte_size -= sizeof(u64);
601 bool find_process(const char *name)
603 size_t len = strlen(name);
608 dir = opendir(procfs__mountpoint());
612 /* Walk through the directory. */
613 while (ret && (d = readdir(dir)) != NULL) {
618 if ((d->d_type != DT_DIR) ||
619 !strcmp(".", d->d_name) ||
620 !strcmp("..", d->d_name))
623 scnprintf(path, sizeof(path), "%s/%s/comm",
624 procfs__mountpoint(), d->d_name);
626 if (filename__read_str(path, &data, &size))
629 ret = strncmp(name, data, len);
634 return ret ? false : true;
638 fetch_kernel_version(unsigned int *puint, char *str,
641 struct utsname utsname;
642 int version, patchlevel, sublevel, err;
647 if (str && str_size) {
648 strncpy(str, utsname.release, str_size);
649 str[str_size - 1] = '\0';
652 err = sscanf(utsname.release, "%d.%d.%d",
653 &version, &patchlevel, &sublevel);
656 pr_debug("Unablt to get kernel version from uname '%s'\n",
662 *puint = (version << 16) + (patchlevel << 8) + sublevel;