linux-kernel - Re: [PATCH 2/2] hyperv: Implement Time Synchronization using host time sample

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Message-ID: <20141014163053.GA7473@localhost.localdomain>
Date:	Tue, 14 Oct 2014 18:30:53 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Mike Surcouf <mps.surcouf.lkml@...il.com>
Cc:	Thomas Shao <huishao@...rosoft.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	KY Srinivasan <kys@...rosoft.com>
Subject: Re: [PATCH 2/2] hyperv: Implement Time Synchronization using host
 time sample

On Tue, Oct 14, 2014 at 04:33:46PM +0200, Richard Cochran wrote:
> 
> IMHO, you should let the guest steer its own clock. That gives the end
> user the most flexibility. Just provide the offset information, and
> let a dedicated service (like ntpd or linuxptp's phc2sys) do the rest.

So if it really about the convenience of not having to run a service
on the guests, then why not expose the guest clock to the host as a
dynamic posix clock? Then you could use phc2sys to tune the guest
without writing even a line of servo code...
 
Thanks,
Richard
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