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Subject: Re: [PATCHv6 0/7] system time changes notification
From: Artem Bityutskiy <dedekind1@gmail.com>
Reply-To: dedekind1@gmail.com
To: Davide Libenzi <davidel@xmailserver.org>
Cc: Alexander Shishkin <virtuoso@slind.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Kyle Moffett <kyle@moffetthome.net>, Valdis.Kletnieks@vt.edu,
        LKML <linux-kernel@vger.kernel.org>, John Stultz <johnstul@us.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "H. Peter Anvin" <hpa@zytor.com>, Kay Sievers <kay.sievers@vrfy.org>,
        Greg KH <gregkh@suse.de>, Chris Friesen <chris.friesen@genband.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        "Kirill A. Shutemov" <kirill@shutemov.name>
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Content-Type: text/plain; charset="UTF-8"
Date: Thu, 18 Nov 2010 15:08:20 +0200
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On Wed, 2010-11-17 at 12:42 -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.
> It should be decided if the feature makes sense, and then have proper 
> interface, instead of multiplexing unrelated insterfaces.
> This is a sort of system-event-report pattern.  What is wrong with using a 
> netlink-based transport for those kind of things?

Could you please explain in more details what is the problem?

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)

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