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From: David Miller <davem@davemloft.net>
Subject: Re: netlink: Kill bogus lock_sock in netlink_insert
Date: Sat, 16 May 2015 16:58:20 -0400 (EDT)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Sat, 16 May 2015 09:50:11 -0700

> Maybe the difference between 3.15 and 4.1 is not coming from
> rhashtable/netlink but other core stuff, like mutex code.
> 
> The workload is largely dominated by mutex acquisition anyway.

Hmmm, the only commit that sticks out for me in that time-frame is:

commit 90631822c5d307b5410500806e8ac3e63928aa3e
Author: Jason Low <jason.low2@hp.com>
Date:   Mon Jul 14 10:27:49 2014 -0700

    locking/spinlocks/mcs: Convert osq lock to atomic_t to reduce overhead