From: Eric Dumazet <edumazet@google.com>
Date: Sat, 4 Oct 2014 17:11:31 +0000 (-0700)
Subject: net: sched: avoid costly atomic operation in fq_dequeue()
X-Git-Tag: fixes-against-v3.18-rc2~144^2~31
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f2600cf02b5b59aaee082c3485b7f01fc7f7b70c;p=pandora-kernel.git

net: sched: avoid costly atomic operation in fq_dequeue()

Standard qdisc API to setup a timer implies an atomic operation on every
packet dequeue : qdisc_unthrottled()

It turns out this is not really needed for FQ, as FQ has no concept of
global qdisc throttling, being a qdisc handling many different flows,
some of them can be throttled, while others are not.

Fix is straightforward : add a 'bool throttle' to
qdisc_watchdog_schedule_ns(), and remove calls to qdisc_unthrottled()
in sch_fq.

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