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_ */ 52