Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752914AbZLASOD (ORCPT ); Tue, 1 Dec 2009 13:14:03 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752199AbZLASOC (ORCPT ); Tue, 1 Dec 2009 13:14:02 -0500 Received: from x35.xmailserver.org ([64.71.152.41]:36736 "EHLO x35.xmailserver.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752107AbZLASOB (ORCPT ); Tue, 1 Dec 2009 13:14:01 -0500 X-Greylist: delayed 486 seconds by postgrey-1.27 at vger.kernel.org; Tue, 01 Dec 2009 13:14:01 EST X-AuthUser: davidel@xmailserver.org Date: Tue, 1 Dec 2009 10:05:56 -0800 (PST) From: Davide Libenzi X-X-Sender: davide@makko.or.mcafeemobile.com To: Mark Hounschell cc: Clemens Ladisch , Mai Daftedar , linux-kernel@vger.kernel.org Subject: Re: Signal from kernel space to user space In-Reply-To: <4B1533B0.1030007@compro.net> Message-ID: References: <2cd4ff050912010307h5570a376xc220a95947775eae@mail.gmail.com> <4B151A86.1060505@ladisch.de> <4B1533B0.1030007@compro.net> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) X-GPG-FINGRPRINT: CFAE 5BEE FD36 F65E E640 56FE 0974 BF23 270F 474E X-GPG-PUBLIC_KEY: http://www.xmailserver.org/davidel.asc MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 781 Lines: 19 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/