struct timer_list switch_timer; /* timer for periodical switch */
struct timer_list read_timer; /* timer for read poll */
raw_spinlock_t raw_tick_nohz_spinlock; /* nohz entry lock/trylock */
struct timer_list switch_timer; /* timer for periodical switch */
struct timer_list read_timer; /* timer for read poll */
raw_spinlock_t raw_tick_nohz_spinlock; /* nohz entry lock/trylock */