How to pull the swapped pages back into physical memory?

Solution Verified - Updated -

Issue

  • After the server suffered from memory pressure, it may swap out some memory pages to the swap partition. But after the memory pressure is gone, the swapped-out pages would not come back to physical memory immediately. Why?

  • And how can we pull them back into physical memory?

Environment

  • Red Hat Enterprise Linux and all other Linux kernel based products

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