linux-kernel - Re: [PATCH net-next] epoll: add EPOLLEXCLUSIVE support

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Message-Id: <20120214.162349.569596872424068284.davem@davemloft.net>
Date:	Tue, 14 Feb 2012 16:23:49 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	hagen@...u.net
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	davidel@...ilserver.org, eric.dumazet@...il.com
Subject: Re: [PATCH net-next] epoll: add EPOLLEXCLUSIVE support

From: Hagen Paul Pfeifer <hagen@...u.net>
Date: Tue, 14 Feb 2012 21:48:04 +0100

> High performance server sometimes create one listening socket (e.g. port
> 80), create a epoll file descriptor and add the socket. Afterwards
> create SC_NPROCESSORS_ONLN threads and wait for events. This often
> result in a thundering herd problem because all CPUs are scheduled.
> 
> This patch add an additional flag to epoll_ctl(2) called EPOLLEXCLUSIVE.
> If a descriptor is added with this flag only one CPU is scheduled in.
> 
> Signed-off-by: Hagen Paul Pfeifer <hagen@...u.net>
> Reported-by: Li Yu <raise.sail@...il.com>

This is not a networking specific change and therefore should not
be submitted via my tree(s).
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