I have run GNU/Linux since 0.99, and it is only in the most recent years that I have seen kswapd
use any serious CPU-time.
In ye olde days the swapsystem would be waiting for the disk and hardly use any CPU time while waiting for the disk to respond.
What changed, so that kswapd
now happily eats almost a full core?
What is kswapd
doing that is so CPU heavy?