From: John Stultz <john.stultz@linaro.org>
To: David Vrabel <david.vrabel@citrix.com>
Cc: xen-devel@lists.xen.org,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] x86: increase precision of x86_platform.get/set_wallclock()
Date: Mon, 13 May 2013 17:57:26 -0700 [thread overview]
Message-ID: <51918BF6.3020702@linaro.org> (raw)
In-Reply-To: <1368467768-2316-2-git-send-email-david.vrabel@citrix.com>
On 05/13/2013 10:56 AM, David Vrabel wrote:
> From: David Vrabel <david.vrabel@citrix.com>
>
> All the virtualized platforms (KVM, lguest and Xen) have persistent
> wallclocks that have more than one second of precision.
>
> read_persistent_wallclock() and update_persistent_wallclock() allow
> for nanosecond precision but their implementation on x86 with
> x86_platform.get/set_wallclock() only allows for one second precision.
> This means guests may see a wallclock time that is off by up to 1
> second.
>
> Make set_wallclock() and get_wallclock() take a struct timespec
> parameter (which allows for nanosecond precision) so KVM and Xen
> guests may start with a more accurate wallclock time and a Xen dom0
> can maintain a more accurate wallclock for guests.
>
> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This one looks pretty good.
Lets circle around on the other two and if after that they still don't
make sense, I'll just queue this one.
Sorry if I'm being thick headed.
thanks
-john
next prev parent reply other threads:[~2013-05-14 0:57 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-13 17:56 [PATCH 0/3] x86,time,xen: maintain an accurate persistent clock in more cases David Vrabel
2013-05-13 17:56 ` [PATCH 1/3] x86: increase precision of x86_platform.get/set_wallclock() David Vrabel
2013-05-14 0:57 ` John Stultz [this message]
2013-05-14 17:52 ` John Stultz
2013-05-29 0:18 ` John Stultz
2013-05-29 12:16 ` David Vrabel
2013-05-13 17:56 ` [PATCH 2/3] timekeeping: sync persistent clock and RTC on system time step changes David Vrabel
2013-05-14 0:40 ` John Stultz
2013-05-14 9:47 ` David Vrabel
2013-05-14 17:15 ` John Stultz
2013-05-15 8:16 ` [Xen-devel] " Jan Beulich
2013-05-15 18:10 ` John Stultz
2013-05-28 18:26 ` David Vrabel
2013-05-28 18:31 ` Konrad Rzeszutek Wilk
2013-05-28 19:09 ` John Stultz
2013-05-28 19:48 ` Konrad Rzeszutek Wilk
2013-05-28 20:03 ` John Stultz
2013-05-28 20:11 ` John Stultz
2013-05-28 20:25 ` Konrad Rzeszutek Wilk
2013-05-28 20:30 ` John Stultz
2013-05-28 19:06 ` John Stultz
2013-05-13 17:56 ` [PATCH 3/3] x86/xen: sync the CMOS RTC as well as the Xen wallclock David Vrabel
2013-05-14 0:52 ` John Stultz
2013-05-14 7:57 ` [Xen-devel] " Jan Beulich
2013-05-14 15:59 ` John Stultz
2013-05-14 16:14 ` Jan Beulich
2013-05-14 16:17 ` John Stultz
2013-05-14 16:24 ` Konrad Rzeszutek Wilk
2013-05-14 16:28 ` John Stultz
2013-05-14 9:55 ` David Vrabel
2013-05-14 17:24 ` John Stultz
2013-05-14 18:00 ` David Vrabel
2013-05-14 18:03 ` John Stultz
2013-05-15 8:19 ` [Xen-devel] " Jan Beulich
2013-05-15 18:13 ` John Stultz
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