Another observation is that when I try to disable swap when the system becomes 
so slow, 
sudo swapoff -a
It fails, and gives an error like" Cannot allocate memory".

I'm wondering if this is related to xorg or intel video driver.
When the memory is occupied, 

cat /proc/dri/0/gem_objects

shows more than 1G object bytes.

I remember last year, there was a serious memory leakage in intel video
driver. But I'm not sure if it's the same bug.

-- 
My swap memory gets full after 5-6hours of computer usage on 10.04
https://bugs.launchpad.net/bugs/560859
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