linux-kernel - Re: [RFC][PATCH 4/4] time: Do leapsecond adjustment in gettime fastpaths

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Message-ID: <alpine.DEB.2.11.1506051406330.7723@nanos>
Date:	Fri, 5 Jun 2015 14:07:12 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Prarit Bhargava <prarit@...hat.com>
cc:	Richard Cochran <richardcochran@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	John Stultz <john.stultz@...aro.org>,
	Ingo Molnar <mingo@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Jan Kara <jack@...e.cz>, Jiri Bohac <jbohac@...e.cz>,
	Ingo Molnar <mingo@...hat.com>,
	Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [RFC][PATCH 4/4] time: Do leapsecond adjustment in gettime
 fastpaths

On Fri, 5 Jun 2015, Prarit Bhargava wrote:

> 
> 
> 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.

Control applications with a 1ms period running on CLOCK_REALTIME are
broken by definition.

> > 
> 
> Anything starting @ UTC midnight (I think that would be Beijing, China?) ...
> being one second off is not good.
> 
> P.
> 
> > Thanks,
> > Richard
> > 
> 
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