Subject: Re: [PATCH] [RFC] notify userspace about time changes
From: john stultz <johnstul@us.ibm.com>
To: Kay Sievers <kay.sievers@vrfy.org>
Cc: Alexander Shishkin <virtuoso@slind.org>, gregkh@suse.de,
        lkml@vger.kernel.org, "Kirill A. Shutemov" <kirill@shutemov.name>,
        Thomas Gleixner <tglx@linutronix.de>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jon Hunter <jon-hunter@ti.com>, Ingo Molnar <mingo@elte.hu>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        David Howells <dhowells@redhat.com>, Avi Kivity <avi@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>, John Kacur <jkacur@redhat.com>,
        linux-kernel@vger.kernel.org
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Date: Thu, 05 Aug 2010 15:29:50 -0700
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On Fri, 2010-08-06 at 00:17 +0200, Kay Sievers wrote:
> On Thu, Aug 5, 2010 at 23:11, john stultz <johnstul@us.ibm.com> wrote:
> > On Thu, 2010-08-05 at 15:33 +0300, Alexander Shishkin wrote:
> >> On 4 August 2010 18:58, john stultz <johnstul@us.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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