On Thu, 2007-07-19 at 19:22 +0200, Andi Kleen wrote:
> On Thursday 19 July 2007 19:15:38 Daniel Walker wrote:
> > On Thu, 2007-07-19 at 19:13 +0200, Andi Kleen wrote:
> > > > What about using the cycles2ns() clocksource helpers, it would eliminate
> > > > the duplication of the shift/multiply math .
> > >
> > > They are completely different from what clocksource provides.
> >
> > How so?
>
> The new sched_clock's works CPU local and relative to the last sync point.
>
Right, I guess I'm speaking more low-level than that .. Both function do
shift-multiply style math .. So between the two the cycles to
nanoseconds conversion code is duplicated, and the code to calculate the
multiply value is duplicated ..
>From my perspective a downside to sched_clock is that the math is
duplicated per architecture .. I think it would be a win to use the
generic functions if it's possible..
Daniel
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