linux-kernel - Re: [PATCH] [RFC] notify userspace about time changes

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Date:	Thu, 05 Aug 2010 15:29:50 -0700
From:	john stultz <johnstul@...ibm.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Alexander Shishkin <virtuoso@...nd.org>, gregkh@...e.de,
	lkml@...r.kernel.org, "Kirill A. Shutemov" <kirill@...temov.name>,
	Thomas Gleixner <tglx@...utronix.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jon Hunter <jon-hunter@...com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Avi Kivity <avi@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	John Kacur <jkacur@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFC] notify userspace about time changes

On Fri, 2010-08-06 at 00:17 +0200, Kay Sievers wrote:
> On Thu, Aug 5, 2010 at 23:11, john stultz <johnstul@...ibm.com> wrote:
> > On Thu, 2010-08-05 at 15:33 +0300, Alexander Shishkin wrote:
> >> On 4 August 2010 18:58, john stultz <johnstul@...ibm.com> 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

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