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    SubjectRe: [patch] sched: accurate user accounting
    Date
    On Sunday 25 March 2007 17:51, Ingo Molnar wrote:
    > * Con Kolivas <kernel@kolivas.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
    -
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