System shows swap usage even though "smaps" are empty

Solution Unverified - Updated -

Issue

  • System shows swap usage even though there are no "smaps" for any running applications.
  • After swap flush(swapoff/swapon) there is no increase in memory usage ? What data was swap holding?
  • After swap flush why did the system did not swapin all the anonymous pages ?

Environment

  • Red Hat Enterprise Linux

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