+int power_set_governor(unsigned int lcore_id, const char *new_governor,
+ char *orig_governor, size_t orig_governor_len);
+int open_core_sysfs_file(FILE **f, const char *mode, const char *format, ...)
+ __rte_format_printf(3, 4);
+int read_core_sysfs_u32(FILE *f, uint32_t *val);
+int read_core_sysfs_s(FILE *f, char *buf, unsigned int len);
+int write_core_sysfs_s(FILE *f, const char *str);