On Mon, Feb 23, 2015 at 09:25:53AM -0500, Kan Liang wrote:
> +/*
> + * Flags PEBS can handle without an PMI.
> + *
> + * TID can only be handled by flushing at context switch.
> + */
> +#define PEBS_FREERUNNING_FLAGS \
> + (PERF_SAMPLE_IP | PERF_SAMPLE_TID | PERF_SAMPLE_ADDR | \
> + PERF_SAMPLE_ID | PERF_SAMPLE_CPU | PERF_SAMPLE_STREAM_ID | \
> + PERF_SAMPLE_DATA_SRC | PERF_SAMPLE_IDENTIFIER | \
> + PERF_SAMPLE_TRANSACTION)
> +
> @@ -683,6 +700,21 @@ void intel_pmu_pebs_enable(struct perf_event *event)
> else if (event->hw.flags & PERF_X86_EVENT_PEBS_ST)
> cpuc->pebs_enabled |= 1ULL << 63;
>
> + /*
> + * 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 */
> + (hwc->flags & PERF_X86_EVENT_AUTO_RELOAD) &&
> + !(event->attr.sample_type & ~PEBS_FREERUNNING_FLAGS)) {
Why not do the FREERUNNING flags thing in intel_pmu_hw_config() when you
set AUTO_RELOAD and make AUTO_RELOAD conditional on it.
That way you only have a single test here. AUTO_RELOAD implies the
sample_type conforms.
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