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

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Message-ID: <1281042665.3405.15.camel@localhost.localdomain>
Date:	Thu, 05 Aug 2010 14:11:05 -0700
From:	john stultz <johnstul@...ibm.com>
To:	Alexander Shishkin <virtuoso@...nd.org>
Cc:	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 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?

thanks
-john


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