Comment # 41 on bug 1159882 from Michal Hocko

(In reply to Robert Delahunt from comment #40)
> http://www.puresimplicity.net/~delahunt/vmstat/suse_stable/
> 
> I guess I didn't need help.
> 
> So I got the new kernel installed and selected it at boot.  Ran the same dd
> test.  I left it running and the system never used swap. 
> /proc/sys/vm/swappiness still = 60.

OK, this is good to know. Newer kernels have changes which check refaults on
anonymous memory as well so this has likely changed the balance. These would be
out of scope for 15.2 unfortunately.

Vlastimil, I remember we have discussed this problem in upstream some time ago.
You've had a patch which has disabled the heuristic (2c012a4ad1a2). Testing
with that reverted would sound like a good next step.