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    SubjectRe: [PATCH v3 5/9] perf, x86: large PEBS interrupt threshold
    On 07/23/2014 12:16 AM, Andi Kleen wrote:
    >> + /*
    >> + * When the event is constrained enough we can use a larger
    >> + * threshold and run the event with less frequent PMI.
    >> + */
    >> + if (0 && /* disable this temporarily */
    >
    > Where in the patchkit does it get reenabled?

    enabled by patch 7
    >
    > -Andi
    >
    >> + (hwc->flags & PERF_X86_EVENT_AUTO_RELOAD) &&
    >> + !(event->attr.sample_type & ~PEBS_FREERUNNING_FLAGS)) {
    >> + threshold = ds->pebs_absolute_maximum -
    >> + x86_pmu.max_pebs_events * x86_pmu.pebs_record_size;
    >> + } else {
    >> + threshold = ds->pebs_buffer_base + x86_pmu.pebs_record_size;
    >> + }
    >> + if (first_pebs || ds->pebs_interrupt_threshold > threshold)
    >> + ds->pebs_interrupt_threshold = threshold;



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