linux-kernel - RE: [PATCH] Drivers: hv: util: Implement Time Synchronization using host time sample

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Message-ID: <CD2CABCB2C0A0D4682C5F8AD84014154098BC7@HKXPRD3002MB006.064d.mgd.msft.net>
Date:	Fri, 26 Sep 2014 15:13:24 +0000
From:	Thomas Shao <huishao@...rosoft.com>
To:	Mike Surcouf <mps.surcouf.lkml@...il.com>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>,
	Olaf Hering <olaf@...fle.de>, Robo Bot <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	KY Srinivasan <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: [PATCH] Drivers: hv: util: Implement Time Synchronization using
 host time sample



> -----Original Message-----
> From: Mike Surcouf [mailto:mps.surcouf.lkml@...il.com]
> Sent: Friday, September 26, 2014 9:52 PM
> To: Thomas Shao
> Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> driverdev-devel@...uxdriverproject.org; Olaf Hering; Robo Bot;
> jasowang@...hat.com; KY Srinivasan; Haiyang Zhang
> Subject: Re: [PATCH] Drivers: hv: util: Implement Time Synchronization using
> host time sample
> 
> In CENTOS and RHEL 6 and upwards the official way would be to use
> 
> /usr/sbin/tickadj
> 
> which is provided by ntp/chrony package
> 
> This dependency on user space packages that may or may not be installed is
> going to cause a lot of confusion in an already confused space.
> Are we sure theres no other way?

Thanks Mike.
I think another way is to expose the do_adjtimex to kernel module. I'm not sure if there is any concerns. I'll investigate that.