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    SubjectRe: [RFC][PATCH 13/19] perf: Per cpu-context rotation timer
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    On Tue, 2010-09-07 at 18:46 +0200, Peter Zijlstra wrote:

    > @@ -5904,6 +5930,9 @@ static void __init perf_event_init_all_c
    >
    > cpuctx = &per_cpu(perf_cpu_context, cpu);
    > __perf_event_init_context(&cpuctx->ctx, NULL);
    > + cpuctx->timer_interval = TICK_NSEC;
    > + hrtimer_init(&cpuctx->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
    > + cpuctx->timer.function = perf_event_context_tick;
    > }

    > +static void perf_pmu_rotate_start(struct pmu *pmu)
    > +{
    > + struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
    > +
    > + if (hrtimer_active(&cpuctx->timer))
    > + return;
    > +
    > + __hrtimer_start_range_ns(&cpuctx->timer,
    > + ns_to_ktime(cpuctx->timer_interval), 0,
    > + HRTIMER_MODE_REL, 0);
    > }

    This probably wants a fuzz factor that lets it fold into the tick we
    already have. Thomas what's the easiest way to do that, give it a soft
    limit of 1ns and hardlimit of TICK_NSEC?




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