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    SubjectRe: [PATCH v2 2/3] perf: use hrtimer for event multiplexing
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    On Wed, 2012-09-12 at 16:48 +0200, Stephane Eranian wrote:
    > On Wed, Sep 12, 2012 at 4:44 PM, Peter Zijlstra <peterz@infradead.org> wrote:
    > > On Wed, 2012-09-12 at 16:43 +0200, Stephane Eranian wrote:
    > >> The hrtimer_active is used to prevent activating the timer multiple times
    > >> in a row.
    > >
    > > see hrtimer_active(), this should do what you want I think.
    >
    > I need something that is true even when the hrtimer is not executing
    > the callback handler. I guess that may be the different between
    > hrtimer_active() vs. hrtimer_running()?

    As the comment states, hrtimer_active() returns true if the timer is
    either in the tree (enqueued) or running.

    hrtimer_callback_running() is true iff the callback is currently
    executing.

    hrtimer_queued() is true iff the timer is queued.




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