linux-kernel - Re: [PATCH] unix: use wq_has_sleeper in unix_dgram

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Message-Id: <20151201.144803.593589376680817466.davem@davemloft.net>
Date:	Tue, 01 Dec 2015 14:48:03 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	rweikusat@...ileactivedefense.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] unix: use wq_has_sleeper in unix_dgram_recvmsg

From: Rainer Weikusat <rweikusat@...ileactivedefense.com>
Date: Thu, 26 Nov 2015 19:23:15 +0000

> The current unix_dgram_recvmsg does a wake up for every received
> datagram. This seems wasteful as only SOCK_DGRAM client sockets in an
> n:1 association with a server socket will ever wait because of the
> associated condition. The patch below changes the function such that the
> wake up only happens if wq_has_sleeper indicates that someone actually
> wants to be notified. Testing with SOCK_SEQPACKET and SOCK_DGRAM socket
> seems to confirm that this is an improvment.
> 
> Signed-Off-By: Rainer Weikusat <rweikusat@...ileactivedefense.com>

Applied, thanks.
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