On Fri, Nov 14, 2014 at 03:43:47PM +0200, Alexander Shishkin wrote:
> +++ b/include/uapi/linux/perf_event.h
> @@ -750,6 +750,17 @@ enum perf_event_type {
> */
> PERF_RECORD_AUX = 11,
>
> + /*
> + * Indicates that instruction trace has started
> + *
> + * struct {
> + * struct perf_event_header header;
> + * u32 pid;
> + * u32 tid;
The below function suggests we should have:
struct sample_id sample_id;
> + * };
> + */
> + PERF_RECORD_ITRACE_START = 12,
> +
> PERF_RECORD_MAX, /* non-ABI */
> };
> +static void perf_log_itrace_start(struct perf_event *event)
> +{
> + struct perf_output_handle handle;
> + struct perf_sample_data sample;
> + struct perf_aux_event {
> + struct perf_event_header header;
> + u32 pid;
> + u32 tid;
> + } rec;
> + int ret;
> +
> + if (event->parent)
> + event = event->parent;
> +
> + if (!(event->pmu->capabilities & PERF_PMU_CAP_ITRACE) ||
> + event->hw.itrace_started)
> + return;
> +
> + event->hw.itrace_started = 1;
> +
> + rec.header.type = PERF_RECORD_ITRACE_START;
> + rec.header.misc = 0;
> + rec.header.size = sizeof(rec);
> + rec.pid = perf_event_pid(event, current);
> + rec.tid = perf_event_tid(event, current);
> +
> + perf_event_header__init_id(&rec.header, &sample, event);
> + ret = perf_output_begin(&handle, event, rec.header.size);
> +
> + if (ret)
> + return;
> +
> + perf_output_put(&handle, rec);
> + perf_event__output_id_sample(event, &handle, &sample);
> +
> + perf_output_end(&handle);
> +}
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