5 #ifdef HAVE_BACKTRACE_SUPPORT
14 #include <linux/kernel.h>
17 * XXX We need to find a better place for these things...
19 unsigned int page_size;
21 bool test_attr__enabled;
23 bool perf_host = true;
24 bool perf_guest = false;
26 char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events";
28 void event_attr_init(struct perf_event_attr *attr)
31 attr->exclude_host = 1;
33 attr->exclude_guest = 1;
34 /* to capture ABI version */
35 attr->size = sizeof(*attr);
38 int mkdir_p(char *path, mode_t mode)
47 if (stat(path, &st) == 0)
52 while ((d = strchr(d, '/'))) {
54 err = stat(path, &st) && mkdir(path, mode);
61 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
64 static int slow_copyfile(const char *from, const char *to, mode_t mode)
69 FILE *from_fp = fopen(from, "r"), *to_fp;
75 old_umask = umask(mode ^ 0777);
76 to_fp = fopen(to, "w");
81 while (getline(&line, &n, from_fp) > 0)
82 if (fputs(line, to_fp) == EOF)
94 int copyfile_mode(const char *from, const char *to, mode_t mode)
104 if (st.st_size == 0) /* /proc? do it slowly... */
105 return slow_copyfile(from, to, mode);
107 fromfd = open(from, O_RDONLY);
111 tofd = creat(to, mode);
115 addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0);
116 if (addr == MAP_FAILED)
119 if (write(tofd, addr, st.st_size) == st.st_size)
122 munmap(addr, st.st_size);
133 int copyfile(const char *from, const char *to)
135 return copyfile_mode(from, to, 0755);
138 unsigned long convert_unit(unsigned long value, char *unit)
160 static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
162 void *buf_start = buf;
166 ssize_t ret = is_read ? read(fd, buf, left) :
167 write(fd, buf, left);
176 BUG_ON((size_t)(buf - buf_start) != n);
181 * Read exactly 'n' bytes or return an error.
183 ssize_t readn(int fd, void *buf, size_t n)
185 return ion(true, fd, buf, n);
189 * Write exactly 'n' bytes or return an error.
191 ssize_t writen(int fd, void *buf, size_t n)
193 return ion(false, fd, buf, n);
196 size_t hex_width(u64 v)
206 static int hex(char ch)
208 if ((ch >= '0') && (ch <= '9'))
210 if ((ch >= 'a') && (ch <= 'f'))
211 return ch - 'a' + 10;
212 if ((ch >= 'A') && (ch <= 'F'))
213 return ch - 'A' + 10;
218 * While we find nice hex chars, build a long_val.
219 * Return number of chars processed.
221 int hex2u64(const char *ptr, u64 *long_val)
227 const int hex_val = hex(*p);
232 *long_val = (*long_val << 4) | hex_val;
239 /* Obtain a backtrace and print it to stdout. */
240 #ifdef HAVE_BACKTRACE_SUPPORT
241 void dump_stack(void)
244 size_t size = backtrace(array, ARRAY_SIZE(array));
245 char **strings = backtrace_symbols(array, size);
248 printf("Obtained %zd stack frames.\n", size);
250 for (i = 0; i < size; i++)
251 printf("%s\n", strings[i]);
256 void dump_stack(void) {}
259 void get_term_dimensions(struct winsize *ws)
261 char *s = getenv("LINES");
264 ws->ws_row = atoi(s);
265 s = getenv("COLUMNS");
267 ws->ws_col = atoi(s);
268 if (ws->ws_row && ws->ws_col)
273 if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
274 ws->ws_row && ws->ws_col)
281 static void set_tracing_events_path(const char *mountpoint)
283 snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s",
284 mountpoint, "tracing/events");
287 const char *perf_debugfs_mount(const char *mountpoint)
291 mnt = debugfs_mount(mountpoint);
295 set_tracing_events_path(mnt);
300 void perf_debugfs_set_path(const char *mntpt)
302 snprintf(debugfs_mountpoint, strlen(debugfs_mountpoint), "%s", mntpt);
303 set_tracing_events_path(mntpt);
306 static const char *find_debugfs(void)
308 const char *path = perf_debugfs_mount(NULL);
311 fprintf(stderr, "Your kernel does not support the debugfs filesystem");
317 * Finds the path to the debugfs/tracing
318 * Allocates the string and stores it.
320 const char *find_tracing_dir(void)
322 static char *tracing;
323 static int tracing_found;
329 debugfs = find_debugfs();
333 tracing = malloc(strlen(debugfs) + 9);
337 sprintf(tracing, "%s/tracing", debugfs);
343 char *get_tracing_file(const char *name)
348 tracing = find_tracing_dir();
352 file = malloc(strlen(tracing) + strlen(name) + 2);
356 sprintf(file, "%s/%s", tracing, name);
360 void put_tracing_file(char *file)
365 int parse_nsec_time(const char *str, u64 *ptime)
367 u64 time_sec, time_nsec;
370 time_sec = strtoul(str, &end, 10);
371 if (*end != '.' && *end != '\0')
378 if (strlen(++end) > 9)
381 strncpy(nsec_buf, end, 9);
384 /* make it nsec precision */
385 for (i = strlen(nsec_buf); i < 9; i++)
388 time_nsec = strtoul(nsec_buf, &end, 10);
394 *ptime = time_sec * NSEC_PER_SEC + time_nsec;
398 unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
400 struct parse_tag *i = tags;
405 s = strchr(str, i->tag);
407 unsigned long int value;
410 value = strtoul(str, &endptr, 10);
414 if (value > ULONG_MAX / i->mult)
422 return (unsigned long) -1;
425 int filename__read_int(const char *filename, int *value)
428 int fd = open(filename, O_RDONLY), err = -1;
433 if (read(fd, line, sizeof(line)) > 0) {
442 int filename__read_str(const char *filename, char **buf, size_t *sizep)
444 size_t size = 0, alloc_size = 0;
445 void *bf = NULL, *nbf;
448 fd = open(filename, O_RDONLY);
453 if (size == alloc_size) {
454 alloc_size += BUFSIZ;
455 nbf = realloc(bf, alloc_size);
464 n = read(fd, bf + size, alloc_size - size);
467 pr_warning("read failed %d: %s\n",
468 errno, strerror(errno));
489 const char *get_filename_for_perf_kvm(void)
491 const char *filename;
493 if (perf_host && !perf_guest)
494 filename = strdup("perf.data.host");
495 else if (!perf_host && perf_guest)
496 filename = strdup("perf.data.guest");
498 filename = strdup("perf.data.kvm");
503 int perf_event_paranoid(void)
506 const char *procfs = procfs__mountpoint();
512 scnprintf(path, PATH_MAX, "%s/sys/kernel/perf_event_paranoid", procfs);
514 if (filename__read_int(path, &value))
520 void mem_bswap_32(void *src, int byte_size)
523 while (byte_size > 0) {
525 byte_size -= sizeof(u32);
530 void mem_bswap_64(void *src, int byte_size)
534 while (byte_size > 0) {
536 byte_size -= sizeof(u64);