1 #include "evsel.h"
2 #include "tests.h"
3 #include "thread_map.h"
4 #include "cpumap.h"
5 #include "debug.h"
6
test__open_syscall_event_on_all_cpus(void)7 int test__open_syscall_event_on_all_cpus(void)
8 {
9 int err = -1, fd, cpu;
10 struct cpu_map *cpus;
11 struct perf_evsel *evsel;
12 unsigned int nr_open_calls = 111, i;
13 cpu_set_t cpu_set;
14 struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
15
16 if (threads == NULL) {
17 pr_debug("thread_map__new\n");
18 return -1;
19 }
20
21 cpus = cpu_map__new(NULL);
22 if (cpus == NULL) {
23 pr_debug("cpu_map__new\n");
24 goto out_thread_map_delete;
25 }
26
27 CPU_ZERO(&cpu_set);
28
29 evsel = perf_evsel__newtp("syscalls", "sys_enter_open", 0);
30 if (evsel == NULL) {
31 pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
32 goto out_thread_map_delete;
33 }
34
35 if (perf_evsel__open(evsel, cpus, threads) < 0) {
36 pr_debug("failed to open counter: %s, "
37 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
38 strerror(errno));
39 goto out_evsel_delete;
40 }
41
42 for (cpu = 0; cpu < cpus->nr; ++cpu) {
43 unsigned int ncalls = nr_open_calls + cpu;
44 /*
45 * XXX eventually lift this restriction in a way that
46 * keeps perf building on older glibc installations
47 * without CPU_ALLOC. 1024 cpus in 2010 still seems
48 * a reasonable upper limit tho :-)
49 */
50 if (cpus->map[cpu] >= CPU_SETSIZE) {
51 pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
52 continue;
53 }
54
55 CPU_SET(cpus->map[cpu], &cpu_set);
56 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
57 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
58 cpus->map[cpu],
59 strerror(errno));
60 goto out_close_fd;
61 }
62 for (i = 0; i < ncalls; ++i) {
63 fd = open("/etc/passwd", O_RDONLY);
64 close(fd);
65 }
66 CPU_CLR(cpus->map[cpu], &cpu_set);
67 }
68
69 /*
70 * Here we need to explicitely preallocate the counts, as if
71 * we use the auto allocation it will allocate just for 1 cpu,
72 * as we start by cpu 0.
73 */
74 if (perf_evsel__alloc_counts(evsel, cpus->nr) < 0) {
75 pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr);
76 goto out_close_fd;
77 }
78
79 err = 0;
80
81 for (cpu = 0; cpu < cpus->nr; ++cpu) {
82 unsigned int expected;
83
84 if (cpus->map[cpu] >= CPU_SETSIZE)
85 continue;
86
87 if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
88 pr_debug("perf_evsel__read_on_cpu\n");
89 err = -1;
90 break;
91 }
92
93 expected = nr_open_calls + cpu;
94 if (evsel->counts->cpu[cpu].val != expected) {
95 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
96 expected, cpus->map[cpu], evsel->counts->cpu[cpu].val);
97 err = -1;
98 }
99 }
100
101 perf_evsel__free_counts(evsel);
102 out_close_fd:
103 perf_evsel__close_fd(evsel, 1, threads->nr);
104 out_evsel_delete:
105 perf_evsel__delete(evsel);
106 out_thread_map_delete:
107 thread_map__delete(threads);
108 return err;
109 }
110