netdev - Re: netlink: Kill bogus lock_sock in netlink

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Message-Id: <20150516.165820.1892952636997510105.davem@davemloft.net>
Date:	Sat, 16 May 2015 16:58:20 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	herbert@...dor.apana.org.au, tgraf@...g.ch, netdev@...r.kernel.org,
	ying.xue@...driver.com
Subject: Re: netlink: Kill bogus lock_sock in netlink_insert

From: Eric Dumazet <eric.dumazet@...il.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@...com>
Date:   Mon Jul 14 10:27:49 2014 -0700

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