parse_format
ret = parse_format(tuple, &parse->format);
static int read_perf_counter_info(const char *const path, const char *const parse_format, void *value_ptr)
if (sscanf(buf, parse_format, value_ptr) != 1) {
static unsigned int read_perf_counter_info_n(const char *const path, const char *const parse_format)
status = read_perf_counter_info(path, parse_format, &v);