From: Eric Dumazet <edumazet@google.com>
Date: Fri, 1 May 2015 17:37:49 +0000 (-0700)
Subject: ipv4: speedup ip_idents_reserve()
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~134^2~393
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=355b590ca24a53f5e2f6999218b5321eaf730a7e;p=pandora-kernel.git

ipv4: speedup ip_idents_reserve()

Under stress, ip_idents_reserve() is accessing a contended
cache line twice, with non optimal MESI transactions.

If we place timestamps in separate location, we reduce this
pressure by ~50% and allow atomic_add_return() to issue
a Request for Ownership.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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