Hi Dave,

this patch removes the lock you saw with will-it-scale/page_fault2
entirely, is there a chance you could give it a spin?  It's based on
v3.17-rc4-mmots-2014-09-12-17-13-4 and that memcg THP fix.  That
kernel also includes the recent root-memcg revert, so you'd have to
run it in a memcg; which is as easy as:

mkdir /sys/fs/cgroup/memory/foo
echo $$ >/sys/fs/cgroup/memory/foo/tasks
perf record -g -a ./runtest.py page_fault2

Thanks!

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