Messages in this thread |  | | From | "Manfred Bartz" <> | Subject | Re: Anyone else interested in a high-precision monotonic counter? | Date | 12 Jan 2001 15:16:30 +1100 |
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"Christopher Friesen" <cfriesen@nortelnetworks.com> wrote:
> Manfred Bartz wrote: > > > Why a new system call? > Well, you'd be accessing a different kernel variable--"ytime" instead of > "xtime". This new variable wouldn't be adjusted when the system > time/date was, it would start at zero and always increase.
> > have you looked at the return-value of times(2) > > Or roll your own using setitimer(2) > > Both of these are precise only to jiffies, which defaults at 10 > milliseconds on x86 and PPC. If you want microsecond timing, the only > current standard way to do it is to use gettimeofday(), which is > sensitive to changes in system date and time.
Ok. A monotonic, high resolution timer would be useful.
Maybe one should then push for a full implementation of xtime including TIME_MONOTONIC and TIME_TAI?
<http://www.cl.cam.ac.uk/~mgk25/c-time/> <http://cr.yp.to/time.html>
-- Manfred - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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