netdev - Re: [PATCH] icmp: No need to call sk_write

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Message-Id: <20091005.001210.118975662.davem@davemloft.net>
Date:	Mon, 05 Oct 2009 00:12:10 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] icmp: No need to call sk_write_space()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 25 Sep 2009 00:16:51 +0200

> 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@...il.com>

Applied to net-next-2.6
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