/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __PERF_EVENTS_STATS_
#define __PERF_EVENTS_STATS_
#include <stdio.h>
#include <perf/event.h>
#include <linux/types.h>
#include "auxtrace.h"
/*
* 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;
};
struct hists_stats {
u64 total_period;
u64 total_non_filtered_period;
u32 nr_samples;
u32 nr_non_filtered_samples;
u32 nr_lost_samples;
u32 nr_dropped_samples;
};
void events_stats__inc(struct events_stats *stats, u32 type);
size_t events_stats__fprintf(struct events_stats *stats, FILE *fp);
#endif /* __PERF_EVENTS_STATS_ */
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