linux-kernel - Re: [Xen-devel] [PATCH 2/3] timekeeping: sync persistent clock and RTC on system time step changes

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Message-ID: <20130528183137.GA23213@phenom.dumpdata.com>
Date:	Tue, 28 May 2013 14:31:37 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	John Stultz <john.stultz@...aro.org>,
	Jan Beulich <JBeulich@...e.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 2/3] timekeeping: sync persistent clock and
 RTC on system time step changes

On Tue, May 28, 2013 at 07:26:14PM +0100, David Vrabel wrote:
> On 15/05/13 19:10, John Stultz wrote:
> > 
> > Ok, so really, as soon as the Dom0 time is set by NTP, all guests will 
> > see the right time? That makes more sense, and means the window for 
> > these sorts of issues is reasonably quite small.
> 
> It's a small window but it's occurring in our automated test system.
> 
> > David: So I'm less inclined to merge this individual change, but if you 
> > still feel strongly about it, let me know and we can circle around on it 
> > after you've addressed the specific issues I pointed out earlier.
> 
> This patch was the actual bug fix but I've reworked it to use the
> pvclock_gtod notifier chain as this seemed to be what KVM hosts were
> using to maintain a clock for guests.  Please review the new series, thanks.

Looks good.

John if you are OK I am thinking to push this to Linus shortly as it is
fixing a bug.

> 
> David
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