On Friday 05 December 2014 13:00:22 Nicolas Pitre wrote: > > BTW this is worth applying despite the on-going discussion with Arnd > on a separate optimization.
Agreed > On Wed, 3 Dec 2014, Nicolas Pitre wrote: > > > At least on ARM, do_div() is optimized to turn constant divisors into > > an inline multiplication by the reciprocal value at compile time. > > However this optimization is missed entirely whenever ktime_divns() is > > used and the slow out-of-line division code is used all the time. > > > > Let ktime_divns() use do_div() inline whenever the divisor is constant > > and small enough. This will make things like ktime_to_us() and > > ktime_to_ms() much faster. > > > > Signed-off-by: Nicolas Pitre <[email protected]> Acked-by: Arnd Bergmann <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
