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Date: Sat, 8 Dec 2007 20:16:29 +0100 From: Ingo Molnar <mingo@...e.hu> To: Arjan van de Ven <arjan@...radead.org> Cc: Guillaume Chazarain <guichaz@...oo.fr>, Thomas Gleixner <tglx@...utronix.de>, Stefano Brivio <stefano.brivio@...imi.it>, Robert Love <rml@...h9.net>, linux-kernel@...r.kernel.org, Dave Jones <davej@...hat.com>, "Rafael J. Wysocki" <rjw@...k.pl>, Michael Buesch <mb@...sch.de>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [patch] x86: scale cyc_2_nsec according to CPU frequency * Arjan van de Ven <arjan@...radead.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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