1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __PERF_EVENTS_STATS_
3 #define __PERF_EVENTS_STATS_
4
5 #include <stdio.h>
6 #include <perf/event.h>
7 #include <linux/types.h>
8 #include "auxtrace.h"
9
10 /*
11 * The kernel collects the number of events it couldn't send in a stretch and
12 * when possible sends this number in a PERF_RECORD_LOST event. The number of
13 * such "chunks" of lost events is stored in .nr_events[PERF_EVENT_LOST] while
14 * total_lost tells exactly how many events the kernel in fact lost, i.e. it is
15 * the sum of all struct perf_record_lost.lost fields reported.
16 *
17 * The kernel discards mixed up samples and sends the number in a
18 * PERF_RECORD_LOST_SAMPLES event. The number of lost-samples events is stored
19 * in .nr_events[PERF_RECORD_LOST_SAMPLES] while total_lost_samples tells
20 * exactly how many samples the kernel in fact dropped, i.e. it is the sum of
21 * all struct perf_record_lost_samples.lost fields reported.
22 *
23 * The total_period is needed because by default auto-freq is used, so
24 * multipling nr_events[PERF_EVENT_SAMPLE] by a frequency isn't possible to get
25 * the total number of low level events, it is necessary to to sum all struct
26 * perf_record_sample.period and stash the result in total_period.
27 */
28 struct events_stats {
29 u64 total_period;
30 u64 total_non_filtered_period;
31 u64 total_lost;
32 u64 total_lost_samples;
33 u64 total_aux_lost;
34 u64 total_aux_partial;
35 u64 total_invalid_chains;
36 u32 nr_events[PERF_RECORD_HEADER_MAX];
37 u32 nr_non_filtered_samples;
38 u32 nr_lost_warned;
39 u32 nr_unknown_events;
40 u32 nr_invalid_chains;
41 u32 nr_unknown_id;
42 u32 nr_unprocessable_samples;
43 u32 nr_auxtrace_errors[PERF_AUXTRACE_ERROR_MAX];
44 u32 nr_proc_map_timeout;
45 };
46
47 void events_stats__inc(struct events_stats *stats, u32 type);
48
49 size_t events_stats__fprintf(struct events_stats *stats, FILE *fp);
50
51 #endif /* __PERF_EVENTS_STATS_ */