/* * 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 perf_record_lost.lost fields reported. * * The kernel discards mixed up samples and sends the number in a * PERF_RECORD_LOST_SAMPLES event. The number of lost-samples events is stored * in .nr_events[PERF_RECORD_LOST_SAMPLES] while total_lost_samples tells * exactly how many samples the kernel in fact dropped, i.e. it is the sum of * all struct perf_record_lost_samples.lost fields reported without setting the * misc field in the header. * * The BPF program can discard samples according to the filter expressions given * by the user. This number is kept in a BPF map and dumped at the end of perf * record in a PERF_RECORD_LOST_SAMPLES event. To differentiate it from other * lost samples, perf tools sets PERF_RECORD_MISC_LOST_SAMPLES_BPF flag in the * header.misc field. The number of dropped-samples events is stored in * .nr_events[PERF_RECORD_LOST_SAMPLES] while total_dropped_samples tells * exactly how many samples the BPF program in fact dropped, i.e. it is the sum * of all struct perf_record_lost_samples.lost fields reported with the misc * field set in the header. * * The total_period is needed because by default auto-freq is used, so * multiplying nr_events[PERF_EVENT_SAMPLE] by a frequency isn't possible to get * the total number of low level events, it is necessary to sum all struct * perf_record_sample.period and stash the result in total_period.
*/ struct events_stats {
u64 total_lost;
u64 total_lost_samples;
u64 total_dropped_samples;
u64 total_aux_lost;
u64 total_aux_partial;
u64 total_aux_collision;
u64 total_invalid_chains;
u32 nr_events[PERF_RECORD_HEADER_MAX];
u32 nr_lost_warned;
u32 nr_unknown_events;
u32 nr_invalid_chains;
u32 nr_unknown_id;
u32 nr_unprocessable_samples;
u32 nr_auxtrace_errors[PERF_AUXTRACE_ERROR_MAX];
u32 nr_proc_map_timeout;
};
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.