Lately I was supposed to do some ksm tests to check if it can be used on a multi-user terminal server to reduce the amount of ram consumed by multiple eclipse instances. I started with ubuntu Lucid. I enabled ksm (echo "1" > /sys/kernel/mm/ksm/run). I also launched multiple eclipse and firefox instances. Then I checked /sys/kernel/mm/ksm/pages_shared which showed 0 all the time, even when the machine started swapping.
Then I upgraded to Maverick and also had no luck with ksm - the situation was the same. I also ran a ksm testing procedure described here:
http://dustinkirkland.wordpress.com/2010/02/06/ksm-now-enabled-in-ubuntu-lucid/
still no activity showed by ksm.
As a last resort, I rebooted with kernel option "apparmor=0" and voila - ksm started running!!!
However - I could not find this connection between apparmor and ksm anywhere - so this post is just to inform you - BEFORE YOU RUN KSM ON UBUNTU, ALWAYS TURN APPARMOR OFF
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