linux-kernel - Re: [tip:timers/core] timerfd: Allow timers to be cancelled when clock was set

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Date:	Wed, 11 May 2011 13:58:47 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	johnstul@...ibm.com, davidel@...ilserver.org, virtuoso@...nd.org,
	tglx@...utronix.de, chris.friesen@...band.com,
	kirill@...temov.name, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:timers/core] timerfd: Allow timers to be cancelled when
 clock was set

On Wed, May 11, 2011 at 12:23, Peter Zijlstra <peterz@...radead.org> wrote:
> On Mon, 2011-05-02 at 19:44 +0000, tip-bot for Thomas Gleixner wrote:
>> Commit-ID:  99ee5315dac6211e972fa3f23bcc9a0343ff58c4
>> Gitweb:     http://git.kernel.org/tip/99ee5315dac6211e972fa3f23bcc9a0343ff58c4
>> Author:     Thomas Gleixner <tglx@...utronix.de>
>> AuthorDate: Wed, 27 Apr 2011 14:16:42 +0200
>> Committer:  Thomas Gleixner <tglx@...utronix.de>
>> CommitDate: Mon, 2 May 2011 21:39:15 +0200
>>
>> timerfd: Allow timers to be cancelled when clock was set
>>
>> Some applications must be aware of clock realtime being set
>> backward. A simple example is a clock applet which arms a timer for
>> the next minute display. If clock realtime is set backward then the
>> applet displays a stale time for the amount of time which the clock
>> was set backwards. Due to that applications poll the time because we
>> don't have an interface.
>
> Shouldn't that clock applet use CLOCK_MONOTONIC for the timer anyway?

Like: Hey let's meet at the bar 5 hours after bootup? :)

Kay
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