Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752074Ab0HRXuy (ORCPT ); Wed, 18 Aug 2010 19:50:54 -0400 Received: from exprod7og118.obsmtp.com ([64.18.2.8]:49522 "EHLO exprod7og118.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751360Ab0HRXuw (ORCPT ); Wed, 18 Aug 2010 19:50:52 -0400 Message-ID: <4C6C71B9.6090606@genband.com> Date: Wed, 18 Aug 2010 17:50:17 -0600 From: Chris Friesen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9) Gecko/20100430 Fedora/3.0.4-2.fc11 Thunderbird/3.0.4 MIME-Version: 1.0 To: Andrew Morton CC: Alexander Shishkin , lkml@vger.kernel.org, "Kirill A. Shutemov" , Thomas Gleixner , John Stultz , Martin Schwidefsky , Jon Hunter , Ingo Molnar , Peter Zijlstra , "Paul E. McKenney" , David Howells , Avi Kivity , "H. Peter Anvin" , John Kacur , Kay Sievers , Greg KH , linux-kernel@vger.kernel.org Subject: Re: [PATCH] [RFCv2] notify userspace about time changes References: <1282139739-23832-1-git-send-email-virtuoso@slind.org> <20100818155702.bc62b2a6.akpm@linux-foundation.org> In-Reply-To: <20100818155702.bc62b2a6.akpm@linux-foundation.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 18 Aug 2010 23:50:22.0838 (UTC) FILETIME=[1F6C9160:01CB3F30] X-TM-AS-Product-Ver: SMEX-8.0.0.4160-6.500.1024-17578.002 X-TM-AS-Result: No--13.373500-5.000000-31 X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1144 Lines: 32 On 08/18/2010 04:57 PM, Andrew Morton wrote: > The requirements sound a bit fluffy to me. > > Any time-displaying application will find out the new time next time > it reads the time. So afaict this is only really useful for clock > applets which display once per minute, so they will show the new time > promptly after the time was altered, yes? Is that really worth adding > new code for? There are other users of this functionality. We have an emulator running on top of linux which in turn runs code originally intended for another OS. It cares about walltime, so it wants to know ASAP if the linux system time changes. We've actually been carrying an internal patch doing something like this for years now...never pushed it to mainline since we didn't think anyone else would be interested. Chris -- Chris Friesen Software Developer GENBAND chris.friesen@genband.com www.genband.com -- 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/