Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756724Ab0HEWaP (ORCPT ); Thu, 5 Aug 2010 18:30:15 -0400 Received: from e4.ny.us.ibm.com ([32.97.182.144]:45109 "EHLO e4.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760926Ab0HEW37 (ORCPT ); Thu, 5 Aug 2010 18:29:59 -0400 Subject: Re: [PATCH] [RFC] notify userspace about time changes From: john stultz To: Kay Sievers Cc: Alexander Shishkin , gregkh@suse.de, lkml@vger.kernel.org, "Kirill A. Shutemov" , Thomas Gleixner , Martin Schwidefsky , Andrew Morton , Jon Hunter , Ingo Molnar , Peter Zijlstra , "Paul E. McKenney" , David Howells , Avi Kivity , "H. Peter Anvin" , John Kacur , linux-kernel@vger.kernel.org In-Reply-To: References: <1280926108-24668-1-git-send-email-virtuoso@slind.org> <1280937526.28884.21.camel@work-vm> <1281042665.3405.15.camel@localhost.localdomain> Content-Type: text/plain; charset="UTF-8" Date: Thu, 05 Aug 2010 15:29:50 -0700 Message-ID: <1281047390.3405.22.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1186 Lines: 24 On Fri, 2010-08-06 at 00:17 +0200, Kay Sievers wrote: > On Thu, Aug 5, 2010 at 23:11, john stultz wrote: > > On Thu, 2010-08-05 at 15:33 +0300, Alexander Shishkin wrote: > >> On 4 August 2010 18:58, john stultz wrote: > >> > Is there a actual use case that you need this for? I don't really have > >> > an issue with the code I just really want to make sure the feature would > >> > be useful enough to justify the API and code maintenance going forward. > > Basically everything that schedules an action based on an absolute > time specification, like at 3pm today, and not in 3 hours from now, > needs to track such system time changes. Otherwise it has to do > nonsense like cron does, to wake up every minute to check the current > time. time_create(CLOCK_REALTIME,...) creates absolute (not relative) timers that should be adjusted when the clock is changed. Is that not the case? -john -- 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/