On a small VPS of mine, I have enough free memory for the things that are running there (as in the log below), but every once in a while, when I run free -m, I see all the swap is taken up.
What could it mean? Is it something I should be worried about or is it just swap that was not freed from a previous spike or something?
total used free shared buffers cached
Mem: 256 225 30 0 5 46
-/+ buffers/cache: 173 83
Swap: 511 511 0