From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 19 Apr 2010 05:07:33 +0000 (+0000)
Subject: rps: shortcut net_rps_action()
X-Git-Tag: v2.6.35-rc1~473^2~440
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=88751275b8e867d756e4f86ae92afe0232de129f;p=pandora-kernel.git

rps: shortcut net_rps_action()

net_rps_action() is a bit expensive on NR_CPUS=64..4096 kernels, even if
RPS is not active.

Tom Herbert used two bitmasks to hold information needed to send IPI,
but a single LIFO list seems more appropriate.

Move all RPS logic into net_rps_action() to cleanup net_rx_action() code
(remove two ifdefs)

Move rps_remote_softirq_cpus into softnet_data to share its first cache
line, filling an existing hole.

In a future patch, we could call net_rps_action() from process_backlog()
to make sure we send IPI before handling this cpu backlog.

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