Re: [PATCH] [RFC] notify userspace about time changes

From: Greg KH
Date: Thu Aug 05 2010 - 17:39:14 EST

On Thu, Aug 05, 2010 at 02:11:05PM -0700, john stultz wrote:
> On Thu, 2010-08-05 at 15:33 +0300, Alexander Shishkin wrote:
> > On 4 August 2010 18:58, john stultz <johnstul@xxxxxxxxxx> 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.
> >
> > Yes. What we have here is an application which takes care of different means
> > of time synchronization (trusted time servers, different GSM operators, etc)
> > and also different kinds of time-based events/notifications (like "dentist
> > appointment next thursday"). When it encounters a time change that is
> > made by some other application, it basically wants to disable automatic
> > time adjustment and trigger the events/notifications which are due at this
> > (new) time.
> Ok. Something specific is always more helpful then theoretical uses.
> I think the filtering is still a bit controversial, so you might want to
> respin it without that. But otherwise I'm ok with it as long as no one
> else objects to any of the minor details of the interface
> GregKH: Does /sys/kernel/time_notify seem ok by you?

Um, it depends, what is that file going to do? I don't see a
Documentation/ABI/ entry here that describes it fully :)


greg k-h
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