Messages in this thread |  | | | Date | Tue, 27 Oct 2009 11:20:10 -0700 | | From | Jeremy Fitzhardinge <> | | Subject | Re: [Xen-devel] Re: [PATCH 3/5] x86/pvclock: add vsyscall implementation |
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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.
J
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