I can confirm this behaviour on both my laptop and my work PC.
My PC has 2GB RAM and I have configured a 4GB swap partition. With KDE 4.2,
compositing turned off and only a firefox tab htop says 2.7GB of swap are used.
That cannot be normal. My RAM is only at 450MB (excluding cached memory).
This is the output of free:
total used free shared buffers cached
Mem: 2051528 1763172 288356 0 12576 1290156
-/+ buffers/cache: 460440 1591088
Swap: 4257184 2774168 1483016
Swap usage is increasing only during normal use (I left the computer on
over the weekend and it stayed constant), but once at a value it never
decreases. Once the swap partition is full I experience an extremely
high hard disk activity, causing the system to become unresponsive.
** Attachment added: "htop-snapshot.png"
http://launchpadlibrarian.net/26362208/htop-snapshot.png
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High load average, disk read, no apparent reason - 2.6.28-11
https://bugs.launchpad.net/bugs/367377
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