linux-kernel - Re: [Xen-devel] Re: [PATCH 3/5] x86/pvclock: add vsyscall implementation

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Date:	Wed, 07 Oct 2009 23:08:03 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	kurt.hackel@...cle.com, the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Glauber de Oliveira Costa <gcosta@...hat.com>,
	Keir Fraser <keir.fraser@...citrix.com>, zach.brown@...cle.com,
	chris.mason@...cle.com
Subject: Re: [Xen-devel] Re: [PATCH 3/5] x86/pvclock: add vsyscall implementation

On 10/07/2009 10:48 PM, Dan Magenheimer wrote:
>> We can support them by falling back to the kernel.  I'm a bit worried
>> about the kernel playing with the hypervisor's version field.  It's
>> better to introduce yet a new version for the kernel, and check both.
>>      
> On Nehalem, apps that need timestamp information at a high
> frequency will likely use rdtsc/rdtscp directly.
>
>    

Then they will get incorrect timing once they are live migrated.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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