> This doesn't seem to work, yet.  If I do, for example:
> 
> dd if=/dev/zero of=foo bs=1m count=30
> 
> and check swap usage with top(1), I see my testing machine has used
> around 25mb.  Now, if I do a "echo a >foo", thus truncating the file, the
> swap usage doesn't vary.  But if I remove it, it really goes away, and
> top(1) only shows 2mb used.

hm, it frees memory but doesn't free swap slots, right?
i'll fix.

YAMAMOTO Takashi