From: Avi Kivity <avi@redhat.com>
To: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
Glauber Costa <glommer@redhat.com>,
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
kurt.hackel@oracle.com, the arch/x86 maintainers <x86@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Glauber de Oliveira Costa <gcosta@redhat.com>,
Xen-devel <xen-devel@lists.xensource.com>,
Keir Fraser <keir.fraser@eu.citrix.com>,
zach.brown@oracle.com, chris.mason@oracle.com,
Ingo Molnar <mingo@redhat.com>
Subject: Re: [Xen-devel] Re: [PATCH 3/5] x86/pvclock: add vsyscall implementation
Date: Thu, 29 Oct 2009 17:07:26 +0200 [thread overview]
Message-ID: <4AE9AFAE.5020306@redhat.com> (raw)
In-Reply-To: <6137c066-3dfd-49dd-bbf2-7718f8542958@default>
On 10/29/2009 04:46 PM, Dan Magenheimer wrote:
> No, the apps I'm familiar with (a DB and a JVM) need a timestamp
> not a monotonic counter. The timestamps must be relatively
> accurate (e.g. we've been talking about gettimeofday generically,
> but these apps would use clock_gettime for nsec resolution),
> monotonically increasing, and work properly across a VM
> migration. The timestamps are taken up to a 100K/sec or
> more so the apps need to ensure they are using the fastest
> mechanism available that meets those requirements.
>
Out of interest, do you know (and can you relate) why those apps need
100k/sec monotonically increasing timestamps?
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2009-10-29 15:07 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-06 0:50 [PATCH RFC] Extending pvclock down to usermode for vsyscall Jeremy Fitzhardinge
2009-10-06 0:50 ` [PATCH 1/5] x86/pvclock: make sure rdtsc doesn't speculate out of region Jeremy Fitzhardinge
2009-10-06 0:50 ` [PATCH 2/5] x86/pvclock: no need to use strong read barriers in pvclock_get_time_values Jeremy Fitzhardinge
2009-10-06 0:50 ` [PATCH 3/5] x86/pvclock: add vsyscall implementation Jeremy Fitzhardinge
2009-10-06 9:04 ` Avi Kivity
2009-10-06 14:19 ` Dan Magenheimer
2009-10-06 15:11 ` Avi Kivity
2009-10-06 18:46 ` [Xen-devel] " Jeremy Fitzhardinge
2009-10-07 10:25 ` Avi Kivity
2009-10-07 19:29 ` Jeremy Fitzhardinge
2009-10-07 20:09 ` Avi Kivity
2009-10-07 21:19 ` Jeremy Fitzhardinge
2009-10-07 21:37 ` Avi Kivity
2009-10-07 21:51 ` Jeremy Fitzhardinge
2009-10-07 21:53 ` Avi Kivity
2009-10-07 20:48 ` Dan Magenheimer
2009-10-07 21:08 ` Avi Kivity
2009-10-07 22:36 ` Dan Magenheimer
2009-10-10 0:24 ` Jeremy Fitzhardinge
2009-10-10 18:10 ` Avi Kivity
2009-10-12 18:20 ` Jeremy Fitzhardinge
2009-10-12 18:29 ` Avi Kivity
2009-10-12 19:13 ` Jeremy Fitzhardinge
2009-10-13 6:39 ` Avi Kivity
2009-10-13 20:00 ` Jeremy Fitzhardinge
2009-10-14 12:32 ` Avi Kivity
2009-10-15 19:17 ` Jeremy Fitzhardinge
2009-10-27 17:29 ` Dan Magenheimer
2009-10-27 18:20 ` Jeremy Fitzhardinge
2009-10-28 5:52 ` Avi Kivity
2009-10-28 9:29 ` Glauber Costa
2009-10-28 9:34 ` Avi Kivity
2009-10-28 17:47 ` Jeremy Fitzhardinge
2009-10-29 12:13 ` Avi Kivity
2009-10-29 13:03 ` Chris Mason
2009-10-29 14:46 ` Dan Magenheimer
2009-10-29 15:07 ` Avi Kivity [this message]
2009-10-29 15:55 ` Dan Magenheimer
2009-10-29 16:15 ` Dan Magenheimer
2009-11-01 9:28 ` Avi Kivity
2009-11-02 15:28 ` Dan Magenheimer
2009-11-02 15:41 ` Avi Kivity
2009-11-01 9:32 ` Avi Kivity
2009-11-02 15:46 ` Dan Magenheimer
2009-11-03 5:12 ` Avi Kivity
2009-11-04 20:30 ` Dan Magenheimer
2009-11-05 6:47 ` Avi Kivity
2009-11-05 14:52 ` Dan Magenheimer
2009-11-05 15:07 ` Keir Fraser
2009-11-04 21:19 ` john stultz
2009-11-04 21:28 ` Dan Magenheimer
2009-11-05 0:02 ` john stultz
2009-11-05 0:45 ` Dan Magenheimer
2009-10-06 0:50 ` [PATCH 4/5] x86/fixmap: add a predicate for usermode fixmaps Jeremy Fitzhardinge
2009-10-06 10:23 ` [Xen-devel] " Jan Beulich
2009-10-06 18:47 ` Jeremy Fitzhardinge
2009-10-06 0:50 ` [PATCH 5/5] xen/time: add pvclock_clocksource_vread support Jeremy Fitzhardinge
2009-10-06 10:28 ` [Xen-devel] " Jan Beulich
2009-10-06 18:48 ` Jeremy Fitzhardinge
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