71 lines
2.6 KiB
C
71 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PERF_EVENTS_STATS_
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#define __PERF_EVENTS_STATS_
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#include <stdio.h>
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#include <perf/event.h>
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#include <linux/types.h>
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#include "auxtrace.h"
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/*
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* The kernel collects the number of events it couldn't send in a stretch and
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* when possible sends this number in a PERF_RECORD_LOST event. The number of
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* such "chunks" of lost events is stored in .nr_events[PERF_EVENT_LOST] while
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* total_lost tells exactly how many events the kernel in fact lost, i.e. it is
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* the sum of all struct perf_record_lost.lost fields reported.
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*
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* The kernel discards mixed up samples and sends the number in a
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* PERF_RECORD_LOST_SAMPLES event. The number of lost-samples events is stored
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* in .nr_events[PERF_RECORD_LOST_SAMPLES] while total_lost_samples tells
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* exactly how many samples the kernel in fact dropped, i.e. it is the sum of
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* all struct perf_record_lost_samples.lost fields reported without setting the
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* misc field in the header.
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*
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* The BPF program can discard samples according to the filter expressions given
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* by the user. This number is kept in a BPF map and dumped at the end of perf
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* record in a PERF_RECORD_LOST_SAMPLES event. To differentiate it from other
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* lost samples, perf tools sets PERF_RECORD_MISC_LOST_SAMPLES_BPF flag in the
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* header.misc field. The number of dropped-samples events is stored in
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* .nr_events[PERF_RECORD_LOST_SAMPLES] while total_dropped_samples tells
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* exactly how many samples the BPF program in fact dropped, i.e. it is the sum
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* of all struct perf_record_lost_samples.lost fields reported with the misc
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* field set in the header.
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*
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* The total_period is needed because by default auto-freq is used, so
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* multiplying nr_events[PERF_EVENT_SAMPLE] by a frequency isn't possible to get
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* the total number of low level events, it is necessary to sum all struct
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* perf_record_sample.period and stash the result in total_period.
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*/
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struct events_stats {
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u64 total_lost;
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u64 total_lost_samples;
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u64 total_dropped_samples;
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u64 total_aux_lost;
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u64 total_aux_partial;
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u64 total_aux_collision;
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u64 total_invalid_chains;
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u32 nr_events[PERF_RECORD_HEADER_MAX];
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u32 nr_lost_warned;
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u32 nr_unknown_events;
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u32 nr_invalid_chains;
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u32 nr_unknown_id;
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u32 nr_unprocessable_samples;
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u32 nr_auxtrace_errors[PERF_AUXTRACE_ERROR_MAX];
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u32 nr_proc_map_timeout;
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};
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struct hists_stats {
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u64 total_period;
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u64 total_non_filtered_period;
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u32 nr_samples;
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u32 nr_non_filtered_samples;
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u32 nr_lost_samples;
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u32 nr_dropped_samples;
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};
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void events_stats__inc(struct events_stats *stats, u32 type);
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size_t events_stats__fprintf(struct events_stats *stats, FILE *fp);
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#endif /* __PERF_EVENTS_STATS_ */
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