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

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Message-ID: <BANLkTim5WzcrzSiqhwXrhDDwcxF=JTpZew@mail.gmail.com>
Date:	Wed, 11 May 2011 16:22:52 +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 16:01, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, 2011-05-11 at 15:52 +0200, Kay Sievers wrote:
>>
>> No, fixed time spans have never been a problem, and are not the
>> example here. It's about the normal wall clock, that wakes up every
>> minute and updates the numbers on the screen.
>
> 'wakes up every minute' sounds like a fixed time interval to me.

Right, but if the wall clock changes, it must not wait for the full
minute to update the numbers, they need to update immediately with the
new wall clock time. Stuff woke up every second in the past to do
that, but that's not what we want today.

Kay
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