#include <linux/perf_event.h>
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#include <perf/evlist.h>
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#include <perf/evsel.h>
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#include <perf/cpumap.h>
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#include <perf/threadmap.h>
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#include <perf/mmap.h>
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#include <perf/core.h>
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#include <perf/event.h>
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#include <stdio.h>
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#include <unistd.h>
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static int libperf_print(enum libperf_print_level level,
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const char *fmt, va_list ap)
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{
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return vfprintf(stderr, fmt, ap);
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}
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union u64_swap {
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__u64 val64;
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__u32 val32[2];
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};
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int main(int argc, char **argv)
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{
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struct perf_evlist *evlist;
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struct perf_evsel *evsel;
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struct perf_mmap *map;
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struct perf_cpu_map *cpus;
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struct perf_event_attr attr = {
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.type = PERF_TYPE_HARDWARE,
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.config = PERF_COUNT_HW_CPU_CYCLES,
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.disabled = 1,
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.freq = 1,
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.sample_freq = 10,
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.sample_type = PERF_SAMPLE_IP|PERF_SAMPLE_TID|PERF_SAMPLE_CPU|PERF_SAMPLE_PERIOD,
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};
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int err = -1;
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union perf_event *event;
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libperf_init(libperf_print);
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cpus = perf_cpu_map__new(NULL);
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if (!cpus) {
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fprintf(stderr, "failed to create cpus\n");
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return -1;
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}
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evlist = perf_evlist__new();
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if (!evlist) {
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fprintf(stderr, "failed to create evlist\n");
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goto out_cpus;
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}
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evsel = perf_evsel__new(&attr);
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if (!evsel) {
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fprintf(stderr, "failed to create cycles\n");
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goto out_cpus;
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}
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perf_evlist__add(evlist, evsel);
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perf_evlist__set_maps(evlist, cpus, NULL);
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err = perf_evlist__open(evlist);
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if (err) {
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fprintf(stderr, "failed to open evlist\n");
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goto out_evlist;
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}
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err = perf_evlist__mmap(evlist, 4);
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if (err) {
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fprintf(stderr, "failed to mmap evlist\n");
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goto out_evlist;
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}
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perf_evlist__enable(evlist);
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sleep(3);
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perf_evlist__disable(evlist);
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perf_evlist__for_each_mmap(evlist, map, false) {
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if (perf_mmap__read_init(map) < 0)
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continue;
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while ((event = perf_mmap__read_event(map)) != NULL) {
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int cpu, pid, tid;
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__u64 ip, period, *array;
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union u64_swap u;
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array = event->sample.array;
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ip = *array;
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array++;
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u.val64 = *array;
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pid = u.val32[0];
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tid = u.val32[1];
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array++;
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u.val64 = *array;
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cpu = u.val32[0];
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array++;
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period = *array;
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fprintf(stdout, "cpu %3d, pid %6d, tid %6d, ip %20llx, period %20llu\n",
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cpu, pid, tid, ip, period);
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perf_mmap__consume(map);
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}
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perf_mmap__read_done(map);
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}
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out_evlist:
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perf_evlist__delete(evlist);
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out_cpus:
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perf_cpu_map__put(cpus);
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return err;
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}
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