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: <51A50D86.2080200@linaro.org>
Date:	Tue, 28 May 2013 13:03:18 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	David Vrabel <david.vrabel@...rix.com>,
	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 05/28/2013 12:48 PM, Konrad Rzeszutek Wilk wrote:
> On Tue, May 28, 2013 at 12:09:14PM -0700, John Stultz wrote:
>> On 05/28/2013 11:31 AM, Konrad Rzeszutek Wilk wrote:
>>> 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.
>> I'm really not sure I'd call this a bug.  That seems like an
>> over-reaction to a misconfigured system.
>>
>> Or if there is a bug, I'm not sure its been clearly explained.
> The #1 patch - b/c you try to set the RTC time and it actually never takes. Meaning
> on the next time the machine is booted the time is again off.

Ok. Yea, that one I'm fine with and have queued for 3.11.

If you want to push it as a bug fix for 3.10, I'll leave it to you to 
push to Linus.

thanks
-john

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