120 lines · c
1#include <linux/perf_event.h>2#include <perf/evlist.h>3#include <perf/evsel.h>4#include <perf/cpumap.h>5#include <perf/threadmap.h>6#include <perf/mmap.h>7#include <perf/core.h>8#include <perf/event.h>9#include <stdio.h>10#include <unistd.h>11 12static int libperf_print(enum libperf_print_level level,13 const char *fmt, va_list ap)14{15 return vfprintf(stderr, fmt, ap);16}17 18union u64_swap {19 __u64 val64;20 __u32 val32[2];21};22 23int main(int argc, char **argv)24{25 struct perf_evlist *evlist;26 struct perf_evsel *evsel;27 struct perf_mmap *map;28 struct perf_cpu_map *cpus;29 struct perf_event_attr attr = {30 .type = PERF_TYPE_HARDWARE,31 .config = PERF_COUNT_HW_CPU_CYCLES,32 .disabled = 1,33 .freq = 1,34 .sample_freq = 10,35 .sample_type = PERF_SAMPLE_IP|PERF_SAMPLE_TID|PERF_SAMPLE_CPU|PERF_SAMPLE_PERIOD,36 };37 int err = -1;38 union perf_event *event;39 40 libperf_init(libperf_print);41 42 cpus = perf_cpu_map__new_online_cpus();43 if (!cpus) {44 fprintf(stderr, "failed to create cpus\n");45 return -1;46 }47 48 evlist = perf_evlist__new();49 if (!evlist) {50 fprintf(stderr, "failed to create evlist\n");51 goto out_cpus;52 }53 54 evsel = perf_evsel__new(&attr);55 if (!evsel) {56 fprintf(stderr, "failed to create cycles\n");57 goto out_cpus;58 }59 60 perf_evlist__add(evlist, evsel);61 62 perf_evlist__set_maps(evlist, cpus, NULL);63 64 err = perf_evlist__open(evlist);65 if (err) {66 fprintf(stderr, "failed to open evlist\n");67 goto out_evlist;68 }69 70 err = perf_evlist__mmap(evlist, 4);71 if (err) {72 fprintf(stderr, "failed to mmap evlist\n");73 goto out_evlist;74 }75 76 perf_evlist__enable(evlist);77 sleep(3);78 perf_evlist__disable(evlist);79 80 perf_evlist__for_each_mmap(evlist, map, false) {81 if (perf_mmap__read_init(map) < 0)82 continue;83 84 while ((event = perf_mmap__read_event(map)) != NULL) {85 int cpu, pid, tid;86 __u64 ip, period, *array;87 union u64_swap u;88 89 array = event->sample.array;90 91 ip = *array;92 array++;93 94 u.val64 = *array;95 pid = u.val32[0];96 tid = u.val32[1];97 array++;98 99 u.val64 = *array;100 cpu = u.val32[0];101 array++;102 103 period = *array;104 105 fprintf(stdout, "cpu %3d, pid %6d, tid %6d, ip %20llx, period %20llu\n",106 cpu, pid, tid, ip, period);107 108 perf_mmap__consume(map);109 }110 111 perf_mmap__read_done(map);112 }113 114out_evlist:115 perf_evlist__delete(evlist);116out_cpus:117 perf_cpu_map__put(cpus);118 return err;119}120