linux-kernel - Re: [PATCHv6 0/7] system time changes notification

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Message-ID: <20101118094908.GE26184@shisha.kicks-ass.net>
Date:	Thu, 18 Nov 2010 11:49:08 +0200
From:	Alexander Shishkin <virtuoso@...nd.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Kyle Moffett <kyle@...fetthome.net>, Valdis.Kletnieks@...edu,
	LKML <linux-kernel@...r.kernel.org>,
	John Stultz <johnstul@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Kay Sievers <kay.sievers@...y.org>, Greg KH <gregkh@...e.de>,
	Chris Friesen <chris.friesen@...band.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>
Subject: Re: [PATCHv6 0/7] system time changes notification

On Wed, Nov 17, 2010 at 10:46:48PM +0100, Thomas Gleixner wrote:
> On Wed, 17 Nov 2010, Alexander Shishkin wrote:
> 
> > On Wed, Nov 17, 2010 at 12:42:52PM -0800, Davide Libenzi wrote:
> > > On Wed, 17 Nov 2010, Alexander Shishkin wrote:
> > > 
> > > > > But what you folks really want for this stuff is an extension to
> > > > > timerfd as you want to be able to poll, right?
> > > > > 
> > > > > So what about the following:
> > > > > 
> > > > > Add a new flag TDF_NOTIFY_CLOCK_WAS_SET to the timerfd flags. Now this
> > > > > flag adds the timer to a separate list, which gets woken up when the
> > > > > clock is set.
> > > > > 
> > > > > No new syscall, just a few lines of code in fs/timerfd.c and
> > > > > clock_was_set().
> > > > > 
> > > > > Thoughts ?
> > > > 
> > > > Something like this (sans ugliness)?
> > > 
> > > Oh, gosh, please.  This is interface-multiplexing-a-palooza.
> > 
> > Thomas made a suggestion, I came up with how it might look like so that
> 
> Yeah, I made the suggestion in the first place and I regretted it when
> Davide told me that I'm nuts :)

Well, I haven't seen any convincing technical arguments in either of
his emails. Kay, for example, made a clear point.

Regards,
--
Alex
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