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Message-ID: <4ACD0333.9060603@redhat.com> 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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