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Date:	Tue, 27 Oct 2009 11:20:10 -0700
From:	Jeremy Fitzhardinge <>
To:	Dan Magenheimer <>
CC:	Avi Kivity <>,
	Jeremy Fitzhardinge <>,, the arch/x86 maintainers <>,
	Linux Kernel Mailing List <>,
	Glauber de Oliveira Costa <>,
	Xen-devel <>,
	Keir Fraser <>,,, Ingo Molnar <>
Subject: Re: [Xen-devel] Re: [PATCH 3/5] x86/pvclock: add	vsyscall	implementation

On 10/27/09 10:29, Dan Magenheimer wrote:
> Is there any way for an application to conclusively determine
> programmatically if the "fast vsyscall" pvclock is functional
> vs the much much slower gettimeofday/clock_gettime equivalents?
> If not, might it be possible to implement some (sysfs?)
> way to determine this, that would also be backwards compatible
> to existing OS's that don't have pvclock+vsyscall supported?

It would probably be simplest and most portable for the app to just
measure the performance of gettimeofday and see if it meets its needs.

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