Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [PATCH 0/2] Make the TSC safe to be used by gettimeofday(). | Date | Tue, 14 Nov 2006 02:50:57 +0100 |
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On Tuesday 14 November 2006 02:06, Suleiman Souhlal wrote: > I've had a proof-of-concept for this since August, and finally got around to > somewhat cleaning it up.
Thanks.
I got a competing implementation for this unfortunately now from Vojtech & Jiri
Yours is simpler, but I'm not sure as complete. What are your assurances against non monoticity for example?
> > It can certainly still be improved, namely by using vgetcpu() instead of CPUID > to find the cpu number (but I couldn't get it to work, when I tried).
What did not work?
> Another possible improvement would be to use RDTSCP when available. > There's also a small race in do_gettimeofday(), vgettimeofday() and > vmonotonic_clock() but I've never seen it happen.
I did a vposix_getclock with monotonic clock support on my own already, was about to be merged with the vDSO. It still used global synchronized TSC though.
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