Messages in this thread | | | Date | Sat, 8 Dec 2007 20:16:29 +0100 | From | Ingo Molnar <> | Subject | Re: [patch] x86: scale cyc_2_nsec according to CPU frequency |
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* Arjan van de Ven <arjan@infradead.org> wrote:
> > > > Firstly, we dont need the 'offset' anymore because cpu_clock() > > > > maintains offsets itself. > > > > > > Yes, but a lower quality one. __update_rq_clock tries to > > > compensate large jumping clocks with a jiffy resolution, while my > > > offset arranges for a very smooth frequency transition. > > > > yes, but that would be easy to fix up via calling > > sched_clock_idle_wakeup_event(0) when doing a frequency transition, > > without burdening the normal sched_clock() codepath with the offset. > > See the attached latest version. > > can this deal with dual/quad core where the frequency of one core > changes if the sofware changes the frequency of the other core?
doesnt the notifier still get run on the target CPU?
Ingo
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