I am surprised to see my Ubuntu 20.04 using swap as there is 700G in buffers/cache.
It has never done this before.
Is something wrong?
I feel like it should return RAM used in buffers/cache to be free prior to using swap.
# cat /proc/sys/vm/swappiness
0
# cat /proc/sys/vm/vfs_cache_pressure
100
# free -g
total used free shared buff/cache available
Mem: 1007 239 18 298 749 462
Swap: 566 138 428