Linux - What are the requirements for a swapper to work?

What are the requirements for a swapper to work?

The functionality of a swapper is on the scheduling priority which is highest. The swapper searches for sleeping process. It searches for the processes that are ready to run for swapping, if the sleeping process not found.

The requirement for the swapper is to work for the process that is ready to run and must be the resident for at least 2 seconds before swapping out. The process must be resided in the swap device for at least 2 seconds, for any swapping. The swapper will go into the wait state, if the requirement is not satisfied, for that event. It will be awaken once in a second by the kernel of the OS.
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