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    SubjectRe: [PATCH 1/3] perf: use hrtimer for event multiplexing
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    On Fri, 2012-09-07 at 16:29 +0200, Stephane Eranian wrote:
    > @@ -148,6 +148,15 @@ static LIST_HEAD(pmus);
    > static DEFINE_MUTEX(pmus_lock);
    > static struct srcu_struct pmus_srcu;
    >
    > +struct perf_cpu_hrtimer {
    > + struct hrtimer hrtimer;
    > + int active;
    > +};
    > +
    > +static DEFINE_PER_CPU(struct list_head, rotation_list);
    > +
    > +static DEFINE_PER_CPU(struct perf_cpu_hrtimer, perf_cpu_hrtimer);


    How about sticking the hrtimer in perf_cpu_context so you can have a
    different rotation interval per PMU ?

    Sorta like e9d2b064149ff7ef4acbc65a1b9374ac8b218d3e removed. Stopping
    the timer when the PMU isn't over committed should solve the NOHZ
    problem I think.


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