Re: Accessing monotonic clock from modules

[Arjan van de Ven]

On Thu, 2005-06-02 at 07:46 -0600, Chris Friesen wrote:
> Arjan van de Ven wrote:
> >>I do thing that this is useful, though--at GUADEC I talked with some
> >>folks who really want to get at a good clock source, the same from both
> >>the kernel and user-space.
> > 
> > 
> > I'd love to see one (but preferably 2 or 3) users of this so that we can
> > figure out what a good interface would look like...
> 
> For ourselves we implemented an clock interface for a limited subset of 
> architectures that provides a fast timestamp in kernel and userspace.
> 
> Basically it has one call to return a 64-bit timestamp, and another call 
> to tell you how fast the clock is ticking.

hmm this is tricky if cpufreq actually varies cpu speeds... you would
need to not cache the "how fast it ticks" for too long.


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