From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 2 Jun 2010 10:24:13 +0000 (-0700)
Subject: net: QDISC_STATE_RUNNING dont need atomic bit ops
X-Git-Tag: v2.6.36-rc1~571^2~690
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=371121057607e;p=pandora-kernel.git

net: QDISC_STATE_RUNNING dont need atomic bit ops

__QDISC_STATE_RUNNING is always changed while qdisc lock is held.

We can avoid two atomic operations in xmit path, if we move this bit in
a new __state container.

Location of this __state container is carefully chosen so that fast path
only dirties one qdisc cache line.

THROTTLED bit could later be moved into this __state location too, to
avoid dirtying first qdisc cache line.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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