linux-kernel - Re: Signal from kernel space to user space

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Message-ID: <alpine.DEB.2.00.0912011003290.20551@makko.or.mcafeemobile.com>
Date:	Tue, 1 Dec 2009 10:05:56 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Mark Hounschell <markh@...pro.net>
cc:	Clemens Ladisch <clemens@...isch.de>,
	Mai Daftedar <mai.daftedar@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Signal from kernel space to user space

On Tue, 1 Dec 2009, Mark Hounschell wrote:

> If no "information" is required, which of these are the fastest, say from an interrupt handler?
> I have a PCI card that handles external interrupts from the outside world and does nothing but
> report those external interrupts to userland. We use send_sig or wake_up_process depending
> on whether userland is going to wait for it or not. If there is a better/faster way I would be
> very interested.

eventfd is. eventfd_signal() is also callable from non-sleeping contexts.


- Davide


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