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

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Message-ID: <20100804154948.GC28519@shisha.kicks-ass.net>
Date:	Wed, 4 Aug 2010 18:49:48 +0300
From:	Alexander Shishkin <virtuoso@...nd.org>
To:	Bastien ROUCARIES <roucaries.bastien@...il.com>
Cc:	lkml@...r.kernel.org, "Kirill A. Shutemov" <kirill@...temov.name>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <johnstul@...ibm.com>,
	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,
	Alexander Shishkin <virtuoso@...nd.org>
Subject: Re: [PATCH] [RFC] notify userspace about time changes

On Wed, Aug 04, 2010 at 02:54:12 +0200, Bastien ROUCARIES wrote:
> On Wed, Aug 4, 2010 at 2:48 PM, Alexander Shishkin <virtuoso@...nd.org> wrote:
> > Certain userspace applications (like "clock" desktop applets or ntpd) might
> > want to be notified when some other application changes the system time. It
> > might also be important for an application to be able to distinguish between
> > its own and somebody else's time changes.
> 
> Why not implementing somtehing like http://lwn.net/Articles/323658/ a
> la plan 9 with a poll callback ?

Thanks for pointing this out, I'll investigate this approach.

> It will be plan9 compatible and so unix

I don't think that plan9 == unix statement is broadly correct, but I don't
know enough on the topic yet.

Regards,
--
Alex
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