* Balbir Singh <[email protected]> wrote:
> >> Am I missing something?
> >
> > delay accounting was causing context-switch slowdown because it
> > called sched_clock() explicitly - but indeed my fix to that is wrong
> > ...
> >
> > how about reverting the change but also using rq->clock instead of
> > sched_clock()?
>
> Hmm... I think that might work, I find that schedule() calls
> __update_rq_clock() which in turn calls sched_clock(), so it might be
> a worthwhile optimization.
yep, that's the idea - in general rq->clock is updated for almost every
scheduling event so you can rely on it instead of calling sched_clock()
directly.
Ingo
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