From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932517AbbFELhk (ORCPT ); Fri, 5 Jun 2015 07:37:40 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57720 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752456AbbFELhi (ORCPT ); Fri, 5 Jun 2015 07:37:38 -0400 Message-ID: <55718A00.5010208@redhat.com> Date: Fri, 05 Jun 2015 07:37:36 -0400 From: Prarit Bhargava User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20131028 Thunderbird/17.0.10 MIME-Version: 1.0 To: Richard Cochran CC: Peter Zijlstra , John Stultz , Ingo Molnar , lkml , Daniel Bristot de Oliveira , Jan Kara , Jiri Bohac , Thomas Gleixner , Ingo Molnar , Shuah Khan Subject: Re: [RFC][PATCH 4/4] time: Do leapsecond adjustment in gettime fastpaths References: <1432931068-4980-1-git-send-email-john.stultz@linaro.org> <1432931068-4980-5-git-send-email-john.stultz@linaro.org> <20150602090154.GA2590@gmail.com> <20150603090452.GA9490@gmail.com> <20150604064809.GA14685@gmail.com> <20150605072913.GD19282@twins.programming.kicks-ass.net> <20150605090433.GC1528@localhost.localdomain> In-Reply-To: <20150605090433.GC1528@localhost.localdomain> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 06/05/2015 05:04 AM, Richard Cochran wrote: > On Fri, Jun 05, 2015 at 09:29:13AM +0200, Peter Zijlstra wrote: >> That leaves the question; for who is this exact second edge important? > > Distributed applications using the UTC time scale. > > Many control applications are done with a 1 millisecond period. > Having the time wrong by a second for 10 or 100 loops is bad news. > Anything starting @ UTC midnight (I think that would be Beijing, China?) ... being one second off is not good. P. > Thanks, > Richard >