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 without setting the 22 * misc field in the header. 23 * 24 * The BPF program can discard samples according to the filter expressions given 25 * by the user. This number is kept in a BPF map and dumped at the end of perf 26 * record in a PERF_RECORD_LOST_SAMPLES event. To differentiate it from other 27 * lost samples, perf tools sets PERF_RECORD_MISC_LOST_SAMPLES_BPF flag in the 28 * header.misc field. The number of dropped-samples events is stored in 29 * .nr_events[PERF_RECORD_LOST_SAMPLES] while total_dropped_samples tells 30 * exactly how many samples the BPF program in fact dropped, i.e. it is the sum 31 * of all struct perf_record_lost_samples.lost fields reported with the misc 32 * field set in the header. 33 * 34 * The total_period is needed because by default auto-freq is used, so 35 * multiplying nr_events[PERF_EVENT_SAMPLE] by a frequency isn't possible to get 36 * the total number of low level events, it is necessary to sum all struct 37 * perf_record_sample.period and stash the result in total_period. 38 */ 39 struct events_stats { 40 u64 total_lost; 41 u64 total_lost_samples; 42 u64 total_dropped_samples; 43 u64 total_aux_lost; 44 u64 total_aux_partial; 45 u64 total_aux_collision; 46 u64 total_invalid_chains; 47 u32 nr_events[PERF_RECORD_HEADER_MAX]; 48 u32 nr_lost_warned; 49 u32 nr_unknown_events; 50 u32 nr_invalid_chains; 51 u32 nr_unknown_id; 52 u32 nr_unprocessable_samples; 53 u32 nr_auxtrace_errors[PERF_AUXTRACE_ERROR_MAX]; 54 u32 nr_proc_map_timeout; 55 }; 56 57 struct hists_stats { 58 u64 total_period; 59 u64 total_non_filtered_period; 60 u32 nr_samples; 61 u32 nr_non_filtered_samples; 62 u32 nr_lost_samples; 63 u32 nr_dropped_samples; 64 }; 65 66 void events_stats__inc(struct events_stats *stats, u32 type); 67 68 size_t events_stats__fprintf(struct events_stats *stats, FILE *fp); 69 70 #endif /* __PERF_EVENTS_STATS_ */ 71