+/*
+ * The kernel collects the number of events it couldn't send in a stretch and
+ * when possible sends this number in a PERF_RECORD_LOST event. The number of
+ * such "chunks" of lost events is stored in .nr_events[PERF_EVENT_LOST] while
+ * total_lost tells exactly how many events the kernel in fact lost, i.e. it is
+ * the sum of all struct lost_event.lost fields reported.
+ *
+ * The total_period is needed because by default auto-freq is used, so
+ * multipling nr_events[PERF_EVENT_SAMPLE] by a frequency isn't possible to get
+ * the total number of low level events, it is necessary to to sum all struct
+ * sample_event.period and stash the result in total_period.
+ */
+struct events_stats {
+ u64 total_period;
+ u64 total_non_filtered_period;
+ u64 total_lost;
+ u64 total_invalid_chains;
+ u32 nr_events[PERF_RECORD_HEADER_MAX];
+ u32 nr_non_filtered_samples;
+ u32 nr_lost_warned;
+ u32 nr_unknown_events;
+ u32 nr_invalid_chains;
+ u32 nr_unknown_id;
+ u32 nr_unprocessable_samples;
+};
+