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  * multiplying 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 sum all struct
26  * perf_record_sample.period and stash the result in total_period.
27  */
28 struct events_stats {
29 	u64 total_lost;
30 	u64 total_lost_samples;
31 	u64 total_aux_lost;
32 	u64 total_aux_partial;
33 	u64 total_aux_collision;
34 	u64 total_invalid_chains;
35 	u32 nr_events[PERF_RECORD_HEADER_MAX];
36 	u32 nr_lost_warned;
37 	u32 nr_unknown_events;
38 	u32 nr_invalid_chains;
39 	u32 nr_unknown_id;
40 	u32 nr_unprocessable_samples;
41 	u32 nr_auxtrace_errors[PERF_AUXTRACE_ERROR_MAX];
42 	u32 nr_proc_map_timeout;
43 };
44 
45 struct hists_stats {
46 	u64 total_period;
47 	u64 total_non_filtered_period;
48 	u32 nr_samples;
49 	u32 nr_non_filtered_samples;
50 	u32 nr_lost_samples;
51 };
52 
53 void events_stats__inc(struct events_stats *stats, u32 type);
54 
55 size_t events_stats__fprintf(struct events_stats *stats, FILE *fp,
56 			     bool skip_empty);
57 
58 #endif /* __PERF_EVENTS_STATS_ */
59