the bitrig haesbaert_mimplock branch has been updated by haesbaert with 1 new 
commit:

commit 752b30d0da5e6c41f8b6f042874d69b0fe85cabf
diff: https://github.com/bitrig/bitrig/commit/752b30d0
author: Christiano F. Haesbaert <[email protected]>
date: Sat Feb 14 11:21:53 2015 +0100

Regain the mplock lost performance.

mpl->mpl_ticket is NOT the synchronizing word, mpl_users is, no need
for it to be atomic.

M       sys/kern/kern_mplock.c
M       sys/sys/mplock.h

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