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    SubjectRe: [RFC PATCH 02/15] nohz_task: Avoid nohz task cpu as non-idle timer target
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    On Mon, 2010-12-20 at 16:47 +0100, Peter Zijlstra wrote:
    > On Mon, 2010-12-20 at 16:24 +0100, Frederic Weisbecker wrote:
    > > Unbound timers are preferably targeted for non idle cpu. If
    > > possible though, prioritize idle cpus over nohz task cpus,
    > > because the main point of nohz task is to avoid unnecessary
    > > timer interrupts.
    >
    > Oh is it?
    >
    > I'd very much expect the cpu that arms the timer to get the interrupt. I
    > mean, if the task doesn't want to get interrupted by timers,
    > _DON'T_USE_TIMERS_ to begin with.
    >
    > So no, don't much like this at all.

    I think this comes from other tasks on other CPUs that are using timers.
    Although, I'm not sure what causes an "unbound" timer to happen. I
    thought timers usually go off on the CPU that asked for it to go off.

    -- Steve




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