libperf(3)
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==========
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NAME
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----
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libperf - Linux kernel perf event library
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SYNOPSIS
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--------
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*Generic API:*
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[source,c]
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--
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#include <perf/core.h>
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enum libperf_print_level {
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LIBPERF_ERR,
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LIBPERF_WARN,
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LIBPERF_INFO,
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LIBPERF_DEBUG,
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LIBPERF_DEBUG2,
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LIBPERF_DEBUG3,
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};
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typedef int (*libperf_print_fn_t)(enum libperf_print_level level,
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const char *, va_list ap);
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void libperf_init(libperf_print_fn_t fn);
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--
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*API to handle CPU maps:*
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[source,c]
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--
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#include <perf/cpumap.h>
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struct perf_cpu_map;
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struct perf_cpu_map *perf_cpu_map__dummy_new(void);
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struct perf_cpu_map *perf_cpu_map__new(const char *cpu_list);
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struct perf_cpu_map *perf_cpu_map__read(FILE *file);
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struct perf_cpu_map *perf_cpu_map__get(struct perf_cpu_map *map);
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struct perf_cpu_map *perf_cpu_map__merge(struct perf_cpu_map *orig,
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struct perf_cpu_map *other);
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void perf_cpu_map__put(struct perf_cpu_map *map);
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int perf_cpu_map__cpu(const struct perf_cpu_map *cpus, int idx);
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int perf_cpu_map__nr(const struct perf_cpu_map *cpus);
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bool perf_cpu_map__empty(const struct perf_cpu_map *map);
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int perf_cpu_map__max(struct perf_cpu_map *map);
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#define perf_cpu_map__for_each_cpu(cpu, idx, cpus)
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--
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*API to handle thread maps:*
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[source,c]
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--
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#include <perf/threadmap.h>
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struct perf_thread_map;
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struct perf_thread_map *perf_thread_map__new_dummy(void);
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void perf_thread_map__set_pid(struct perf_thread_map *map, int thread, pid_t pid);
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char *perf_thread_map__comm(struct perf_thread_map *map, int thread);
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int perf_thread_map__nr(struct perf_thread_map *threads);
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pid_t perf_thread_map__pid(struct perf_thread_map *map, int thread);
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struct perf_thread_map *perf_thread_map__get(struct perf_thread_map *map);
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void perf_thread_map__put(struct perf_thread_map *map);
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--
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*API to handle event lists:*
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[source,c]
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--
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#include <perf/evlist.h>
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struct perf_evlist;
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void perf_evlist__add(struct perf_evlist *evlist,
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struct perf_evsel *evsel);
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void perf_evlist__remove(struct perf_evlist *evlist,
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struct perf_evsel *evsel);
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struct perf_evlist *perf_evlist__new(void);
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void perf_evlist__delete(struct perf_evlist *evlist);
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struct perf_evsel* perf_evlist__next(struct perf_evlist *evlist,
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struct perf_evsel *evsel);
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int perf_evlist__open(struct perf_evlist *evlist);
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void perf_evlist__close(struct perf_evlist *evlist);
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void perf_evlist__enable(struct perf_evlist *evlist);
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void perf_evlist__disable(struct perf_evlist *evlist);
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#define perf_evlist__for_each_evsel(evlist, pos)
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void perf_evlist__set_maps(struct perf_evlist *evlist,
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struct perf_cpu_map *cpus,
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struct perf_thread_map *threads);
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int perf_evlist__poll(struct perf_evlist *evlist, int timeout);
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int perf_evlist__filter_pollfd(struct perf_evlist *evlist,
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short revents_and_mask);
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int perf_evlist__mmap(struct perf_evlist *evlist, int pages);
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void perf_evlist__munmap(struct perf_evlist *evlist);
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struct perf_mmap *perf_evlist__next_mmap(struct perf_evlist *evlist,
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struct perf_mmap *map,
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bool overwrite);
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#define perf_evlist__for_each_mmap(evlist, pos, overwrite)
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--
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*API to handle events:*
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[source,c]
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--
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#include <perf/evsel.h>*
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struct perf_evsel;
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struct perf_counts_values {
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union {
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struct {
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uint64_t val;
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uint64_t ena;
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uint64_t run;
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};
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uint64_t values[3];
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};
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};
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struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr);
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void perf_evsel__delete(struct perf_evsel *evsel);
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int perf_evsel__open(struct perf_evsel *evsel, struct perf_cpu_map *cpus,
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struct perf_thread_map *threads);
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void perf_evsel__close(struct perf_evsel *evsel);
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void perf_evsel__close_cpu(struct perf_evsel *evsel, int cpu);
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int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
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struct perf_counts_values *count);
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int perf_evsel__enable(struct perf_evsel *evsel);
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int perf_evsel__enable_cpu(struct perf_evsel *evsel, int cpu);
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int perf_evsel__disable(struct perf_evsel *evsel);
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int perf_evsel__disable_cpu(struct perf_evsel *evsel, int cpu);
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struct perf_cpu_map *perf_evsel__cpus(struct perf_evsel *evsel);
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struct perf_thread_map *perf_evsel__threads(struct perf_evsel *evsel);
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struct perf_event_attr *perf_evsel__attr(struct perf_evsel *evsel);
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--
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*API to handle maps (perf ring buffers):*
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[source,c]
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--
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#include <perf/mmap.h>
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struct perf_mmap;
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void perf_mmap__consume(struct perf_mmap *map);
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int perf_mmap__read_init(struct perf_mmap *map);
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void perf_mmap__read_done(struct perf_mmap *map);
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union perf_event *perf_mmap__read_event(struct perf_mmap *map);
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--
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*Structures to access perf API events:*
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[source,c]
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--
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#include <perf/event.h>
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struct perf_record_mmap;
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struct perf_record_mmap2;
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struct perf_record_comm;
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struct perf_record_namespaces;
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struct perf_record_fork;
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struct perf_record_lost;
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struct perf_record_lost_samples;
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struct perf_record_read;
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struct perf_record_throttle;
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struct perf_record_ksymbol;
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struct perf_record_bpf_event;
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struct perf_record_sample;
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struct perf_record_switch;
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struct perf_record_header_attr;
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struct perf_record_record_cpu_map;
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struct perf_record_cpu_map_data;
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struct perf_record_cpu_map;
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struct perf_record_event_update_cpus;
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struct perf_record_event_update_scale;
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struct perf_record_event_update;
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struct perf_trace_event_type;
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struct perf_record_header_event_type;
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struct perf_record_header_tracing_data;
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struct perf_record_header_build_id;
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struct perf_record_id_index;
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struct perf_record_auxtrace_info;
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struct perf_record_auxtrace;
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struct perf_record_auxtrace_error;
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struct perf_record_aux;
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struct perf_record_itrace_start;
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struct perf_record_thread_map_entry;
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struct perf_record_thread_map;
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struct perf_record_stat_config_entry;
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struct perf_record_stat_config;
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struct perf_record_stat;
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struct perf_record_stat_round;
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struct perf_record_time_conv;
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struct perf_record_header_feature;
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struct perf_record_compressed;
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--
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DESCRIPTION
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-----------
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The libperf library provides an API to access the linux kernel perf
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events subsystem.
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Following objects are key to the libperf interface:
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[horizontal]
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struct perf_cpu_map:: Provides a CPU list abstraction.
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struct perf_thread_map:: Provides a thread list abstraction.
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struct perf_evsel:: Provides an abstraction for single a perf event.
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struct perf_evlist:: Gathers several struct perf_evsel object and performs functions on all of them.
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struct perf_mmap:: Provides an abstraction for accessing perf ring buffer.
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The exported API functions bind these objects together.
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REPORTING BUGS
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--------------
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Report bugs to <linux-perf-users@vger.kernel.org>.
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LICENSE
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-------
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libperf is Free Software licensed under the GNU LGPL 2.1
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RESOURCES
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---------
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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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SEE ALSO
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--------
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libperf-sampling(7), libperf-counting(7)
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