virtual memory management

[[LoN]Kamikaze]

> Don't forget that the system also pages to swap space and it takes the
> attitude of parking as much as possible out there in case it comes in
> to demand again.  Ten if it really needs the space for something, it 
> invalidates the oldest stuff and uses that space.
> 
> So, you should really expect that your swap space should be 
> nearly maxed all the time if things are working well.

If this is the case something is really wrong on my system:

Swap: 4096M Total, 4096M Free

either top doesn't show the precautionary swapping or this is not happening.