Re: [PATCH] unix: use wq_has_sleeper in unix_dgram_recvmsg

David Miller
2015-12-01T19:48:07Z

From: Rainer Weikusat <rweikusat@mobileactivedefense.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@mobileactivedefense.com>

Applied, thanks.