On Wed, 20 Jan 2016, Peter Zijlstra wrote: > On Wed, Jan 20, 2016 at 08:57:06PM +0100, Thomas Gleixner wrote: > > > Here too, ktime_get() is daft. > > > > What's the problem? ktime_xxx() itself or just the clock monotonic variant? > > > > On 99.9999% of the platforms ktime_get_mono_fast/raw_fast is not any slower > > than sched_clock(). The only case where sched_clock is faster is if your TSC > > is buggered and the box switches to HPET for timekeeping. > > The HPET thing, I just don't want to have to explain why this is so much > more expensive on some random weird machine, esp. since it really > doesn't matter.
Fair enough.