Attached you can find both the tool to fragment memory and the script it
calls in my testing.

I was executing this as follows (on 2G machine with 2G swap space):
echo 1 > /proc/sys/vm/overcommit_memory
echo 1 > /proc/sys/vm/compact_memory
/root/fragment-mem-and-run /root/alloc_hugepages.sh 1920M 250M
-- 
Michal Hocko
SUSE Labs