From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 24 Sep 2009 12:16:51 +0000 (+0000)
Subject: icmp: No need to call sk_write_space()
X-Git-Tag: v2.6.33-rc1~388^2~944
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b3a5b6cc7cab89dcc3301add750f88019d910a2b;p=pandora-kernel.git

icmp: No need to call sk_write_space()

We can make icmp messages tx completion callback a litle bit faster.

Setting SOCK_USE_WRITE_QUEUE sk flag tells sock_wfree() to
not call sk_write_space() on a socket we know no thread is posssibly
waiting for write space. (on per cpu kernel internal icmp sockets only)

This avoids the sock_def_write_space() call and
read_lock(&sk->sk_callback_lock)/read_unlock(&sk->sk_callback_lock) calls
as well.

We avoid three atomic ops.

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