1*4882a593Smuzhiyun #include <linux/perf_event.h>
2*4882a593Smuzhiyun #include <perf/evlist.h>
3*4882a593Smuzhiyun #include <perf/evsel.h>
4*4882a593Smuzhiyun #include <perf/cpumap.h>
5*4882a593Smuzhiyun #include <perf/threadmap.h>
6*4882a593Smuzhiyun #include <perf/mmap.h>
7*4882a593Smuzhiyun #include <perf/core.h>
8*4882a593Smuzhiyun #include <perf/event.h>
9*4882a593Smuzhiyun #include <stdio.h>
10*4882a593Smuzhiyun #include <unistd.h>
11*4882a593Smuzhiyun
libperf_print(enum libperf_print_level level,const char * fmt,va_list ap)12*4882a593Smuzhiyun static int libperf_print(enum libperf_print_level level,
13*4882a593Smuzhiyun const char *fmt, va_list ap)
14*4882a593Smuzhiyun {
15*4882a593Smuzhiyun return vfprintf(stderr, fmt, ap);
16*4882a593Smuzhiyun }
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun union u64_swap {
19*4882a593Smuzhiyun __u64 val64;
20*4882a593Smuzhiyun __u32 val32[2];
21*4882a593Smuzhiyun };
22*4882a593Smuzhiyun
main(int argc,char ** argv)23*4882a593Smuzhiyun int main(int argc, char **argv)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun struct perf_evlist *evlist;
26*4882a593Smuzhiyun struct perf_evsel *evsel;
27*4882a593Smuzhiyun struct perf_mmap *map;
28*4882a593Smuzhiyun struct perf_cpu_map *cpus;
29*4882a593Smuzhiyun struct perf_event_attr attr = {
30*4882a593Smuzhiyun .type = PERF_TYPE_HARDWARE,
31*4882a593Smuzhiyun .config = PERF_COUNT_HW_CPU_CYCLES,
32*4882a593Smuzhiyun .disabled = 1,
33*4882a593Smuzhiyun .freq = 1,
34*4882a593Smuzhiyun .sample_freq = 10,
35*4882a593Smuzhiyun .sample_type = PERF_SAMPLE_IP|PERF_SAMPLE_TID|PERF_SAMPLE_CPU|PERF_SAMPLE_PERIOD,
36*4882a593Smuzhiyun };
37*4882a593Smuzhiyun int err = -1;
38*4882a593Smuzhiyun union perf_event *event;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun libperf_init(libperf_print);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun cpus = perf_cpu_map__new(NULL);
43*4882a593Smuzhiyun if (!cpus) {
44*4882a593Smuzhiyun fprintf(stderr, "failed to create cpus\n");
45*4882a593Smuzhiyun return -1;
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun evlist = perf_evlist__new();
49*4882a593Smuzhiyun if (!evlist) {
50*4882a593Smuzhiyun fprintf(stderr, "failed to create evlist\n");
51*4882a593Smuzhiyun goto out_cpus;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun evsel = perf_evsel__new(&attr);
55*4882a593Smuzhiyun if (!evsel) {
56*4882a593Smuzhiyun fprintf(stderr, "failed to create cycles\n");
57*4882a593Smuzhiyun goto out_cpus;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun perf_evlist__add(evlist, evsel);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun perf_evlist__set_maps(evlist, cpus, NULL);
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun err = perf_evlist__open(evlist);
65*4882a593Smuzhiyun if (err) {
66*4882a593Smuzhiyun fprintf(stderr, "failed to open evlist\n");
67*4882a593Smuzhiyun goto out_evlist;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun err = perf_evlist__mmap(evlist, 4);
71*4882a593Smuzhiyun if (err) {
72*4882a593Smuzhiyun fprintf(stderr, "failed to mmap evlist\n");
73*4882a593Smuzhiyun goto out_evlist;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun perf_evlist__enable(evlist);
77*4882a593Smuzhiyun sleep(3);
78*4882a593Smuzhiyun perf_evlist__disable(evlist);
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun perf_evlist__for_each_mmap(evlist, map, false) {
81*4882a593Smuzhiyun if (perf_mmap__read_init(map) < 0)
82*4882a593Smuzhiyun continue;
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun while ((event = perf_mmap__read_event(map)) != NULL) {
85*4882a593Smuzhiyun int cpu, pid, tid;
86*4882a593Smuzhiyun __u64 ip, period, *array;
87*4882a593Smuzhiyun union u64_swap u;
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun array = event->sample.array;
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun ip = *array;
92*4882a593Smuzhiyun array++;
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun u.val64 = *array;
95*4882a593Smuzhiyun pid = u.val32[0];
96*4882a593Smuzhiyun tid = u.val32[1];
97*4882a593Smuzhiyun array++;
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun u.val64 = *array;
100*4882a593Smuzhiyun cpu = u.val32[0];
101*4882a593Smuzhiyun array++;
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun period = *array;
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun fprintf(stdout, "cpu %3d, pid %6d, tid %6d, ip %20llx, period %20llu\n",
106*4882a593Smuzhiyun cpu, pid, tid, ip, period);
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun perf_mmap__consume(map);
109*4882a593Smuzhiyun }
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun perf_mmap__read_done(map);
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun out_evlist:
115*4882a593Smuzhiyun perf_evlist__delete(evlist);
116*4882a593Smuzhiyun out_cpus:
117*4882a593Smuzhiyun perf_cpu_map__put(cpus);
118*4882a593Smuzhiyun return err;
119*4882a593Smuzhiyun }
120