Tunables for 2.23?

[Paul E. Murphy]

Siddhesh has been working on Tunables on his siddhesh/tunables branch. I'd done
some extra work to extend it to support dynamic TLE [1]. This is needed to get
good TLE performance from power8 hardware.

I'd like to see this cleaned up and included in the next release. Is this still
practical?

Are there still others outside of ppc who would like to see this feature
get in for this release?

-Paul

[1] https://sourceware.org/ml/libc-alpha/2015-10/msg00071.html