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

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Message-ID: <20100805213851.GA13868@suse.de>
Date:	Thu, 5 Aug 2010 14:38:51 -0700
From:	Greg KH <gregkh@...e.de>
To:	john stultz <johnstul@...ibm.com>
Cc:	Alexander Shishkin <virtuoso@...nd.org>, 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 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@...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.
> > 
> > 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 :)

thanks,

greg k-h
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