Messages in this thread | | | Subject | Re: [RFC 0/2] ABI for clock_gettime_ns | From | john stultz <> | Date | Mon, 12 Dec 2011 19:43:02 -0800 |
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On Tue, 2011-12-13 at 04:24 +0100, Richard Cochran wrote: > On Mon, Dec 12, 2011 at 05:26:36PM -0800, Andy Lutomirski wrote: > > On x86-64, clock_gettime is so fast that the overhead converting to and > > from nanoseconds is non-negligible. clock_gettime_ns is a different > > interface that is potentially faster. If people like the ABI, I'll > > implement an optimized version. > > I am not so interested in performance optimizations, but do I think > offering time in nanoseconds is attractive from an application point > of view. The timespec is impractical for everyone. > > While you are at it with new syscalls, why not make a clean break from > POSIX and fix the uglies? > > - New name, to distance ourselves from POSIX (clock_ns_get?) > - Family of calls, with set/get > - Sub nanosecond field > - TAI time base (or according to parameter?)
Having a CLOCK_TAI would be interesting across the board. We already keep a TAI offset in the ntp code. However, I'm not sure if ntp actually sets it these days.
thanks -john
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