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Message-Id: <200703251839.24148.kernel@kolivas.org> Date: Sun, 25 Mar 2007 18:39:23 +1000 From: Con Kolivas <kernel@...ivas.org> To: Ingo Molnar <mingo@...e.hu> Cc: linux list <linux-kernel@...r.kernel.org>, malc <av1474@...tv.ru>, zwane@...radead.org, ck list <ck@....kolivas.org>, Andrew Morton <akpm@...ux-foundation.org>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: [patch] sched: accurate user accounting On Sunday 25 March 2007 17:51, Ingo Molnar wrote: > * Con Kolivas <kernel@...ivas.org> wrote: > > For an rsdl 0.33 patched kernel. Comments? Overhead worth it? > > we want to do this - and we should do this to the vanilla scheduler > first and check the results. I've back-merged the patch to before RSDL > and have tested it - find the patch below. Vale, could you try this > patch against a 2.6.21-rc4-ish kernel and re-test your testcase? Great. That should fix a lot of misconceptions about cpu usage and HZ. However- > +/* > + * Some helpers for converting nanosecond timing to jiffy resolution > + */ > +#define NS_TO_JIFFIES(TIME) ((TIME) / (1000000000 / HZ)) > +#define JIFFIES_TO_NS(TIME) ((TIME) * (1000000000 / HZ)) > + This hunk is already in mainline so it will be double defined now. Thanks. -- -ck - 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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