Spending time in the kernel

In this recipe, we will take a look at how we can delay the execution after some time in the future by using busy loops or more complex functions that may involve a suspension.

Getting ready

Even in this recipe, we can use a kernel module to see how a test code works.

How to do it...

In the time.c file, we can find a simple example exemplifying how the preceding functions work:

1. As the first step, we declare a utility function to get the execution time in nanoseconds, of a line of code:

#define print_time(str, code)     \
    do {          ...