[ale] Swap Memory usage

[John Wells]

Greg Freemyer said:
> On the otherhand, once data is moved to swap it is left there until it
> is deleted.

I thought the point of swap was to move lower priority data into the swap
to free up RAM, but then move it back into RAM if its need becomes a
priority again.  In other words, if an app that uses the data is currently
in memory and running, any swapped data it uses would be loaded back into
main RAM provided space was available.  Is this not the case?

John