How to sleep in the Linux kernel space?

Question

I have a kernel thread which is assigned on a specific CPU with FIFO and highest priority. This thread sleeps from time to time but the time interval must be as precise as possi

Answer 1

I've used combination of hrtimer and waitqueue to implement periodical task using kernel thread:

1. create waitqueue and periodic hrtimer
2. block kernel thread on waitqueue using wait_event()/wait_event_timeout()
3. in the hrtimer callback call wake_up()/wake_up_all()

Also, just found, you can implement sleep using hrtimer_init_sleeper() and schedule(), see __wait_event_hrtimeout() or do_nanosleep(). But I nether tried that.