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From: Richard Cochran <richardcochran@gmail.com>
To: Jeff Epler <jepler@unpythonic.net>
Cc: Thomas Shao <huishao@microsoft.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"devel@linuxdriverproject.org" <devel@linuxdriverproject.org>,
	"olaf@aepfle.de" <olaf@aepfle.de>,
	"apw@canonical.com" <apw@canonical.com>,
	"jasowang@redhat.com" <jasowang@redhat.com>,
	KY Srinivasan <kys@microsoft.com>,
	John Stultz <john.stultz@linaro.org>,
	Richard Cochran <rcochran@linutronix.de>
Subject: Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for do_adjtimex()
Date: Tue, 21 Oct 2014 10:20:58 +0200	[thread overview]
Message-ID: <20141021082058.GB6808@netboy> (raw)
In-Reply-To: <20141021040212.GA6278@unpythonic.net>

On Mon, Oct 20, 2014 at 11:02:13PM -0500, Jeff Epler wrote:
> It's interesting to imagine that a virtualization host could present a
> time service to the guest *userspace*, even when the guest is not
> otherwise exposed to the internet at large.  This could take the form of
> an NTP server on a private network, or as an implementation of a time
> source directly usable by ntpd in the guest, for instance as an emulated
> serial port with synthetic NEMA GPS signal + PPS signal, for instance.

If the idea is to avoid bothering the guest user space, in order to be
convenient, then the host can provide a synthetic PPS, to be used by
the kernel's hardpps logic.

Thanks,
Richard

  parent reply	other threads:[~2014-10-21  8:21 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-15  8:39 [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for do_adjtimex() Thomas Shao
2014-10-20 18:28 ` Thomas Gleixner
2014-10-20 18:40   ` Thomas Gleixner
2014-10-21  3:18     ` Thomas Shao
2014-10-21  3:24       ` John Stultz
2014-10-21  4:08         ` Thomas Shao
2014-10-21  8:23           ` Thomas Gleixner
2014-10-21  4:02       ` Jeff Epler
2014-10-21  4:55         ` Thomas Shao
2014-10-21  8:25           ` Thomas Gleixner
2014-10-21  8:20         ` Richard Cochran [this message]
2014-10-21 10:11           ` Thomas Shao
2014-10-22 11:01             ` Mike Surcouf
2014-10-22 12:42               ` Thomas Gleixner
2014-10-22 13:51                 ` Thomas Shao
2014-10-22 14:20                   ` Mike Surcouf
2014-10-21  8:13       ` Richard Cochran
2014-10-21  9:16         ` Thomas Shao
2014-10-21  8:19       ` Thomas Gleixner
2014-10-21  9:02         ` Thomas Shao
2014-10-21  2:37   ` Thomas Shao

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