Commit | Line | Data |
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bd90517b JO |
1 | #include "evsel.h" |
2 | #include "tests.h" | |
3 | #include "thread_map.h" | |
4 | #include "cpumap.h" | |
5 | #include "debug.h" | |
6 | ||
43f322b4 | 7 | int test__openat_syscall_event_on_all_cpus(void) |
bd90517b JO |
8 | { |
9 | int err = -1, fd, cpu; | |
bd90517b JO |
10 | struct cpu_map *cpus; |
11 | struct perf_evsel *evsel; | |
43f322b4 | 12 | unsigned int nr_openat_calls = 111, i; |
bd90517b | 13 | cpu_set_t cpu_set; |
a60d7953 | 14 | struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX); |
ba3dfff8 | 15 | char sbuf[STRERR_BUFSIZE]; |
bd90517b | 16 | |
bd90517b JO |
17 | if (threads == NULL) { |
18 | pr_debug("thread_map__new\n"); | |
19 | return -1; | |
20 | } | |
21 | ||
22 | cpus = cpu_map__new(NULL); | |
23 | if (cpus == NULL) { | |
24 | pr_debug("cpu_map__new\n"); | |
25 | goto out_thread_map_delete; | |
26 | } | |
27 | ||
bd90517b JO |
28 | CPU_ZERO(&cpu_set); |
29 | ||
43f322b4 | 30 | evsel = perf_evsel__newtp("syscalls", "sys_enter_openat"); |
bd90517b | 31 | if (evsel == NULL) { |
23773ca1 SRRH |
32 | if (tracefs_configured()) |
33 | pr_debug("is tracefs mounted on /sys/kernel/tracing?\n"); | |
34 | else if (debugfs_configured()) | |
35 | pr_debug("is debugfs mounted on /sys/kernel/debug?\n"); | |
36 | else | |
37 | pr_debug("Neither tracefs or debugfs is enabled in this kernel\n"); | |
bd90517b JO |
38 | goto out_thread_map_delete; |
39 | } | |
40 | ||
41 | if (perf_evsel__open(evsel, cpus, threads) < 0) { | |
42 | pr_debug("failed to open counter: %s, " | |
43 | "tweak /proc/sys/kernel/perf_event_paranoid?\n", | |
ba3dfff8 | 44 | strerror_r(errno, sbuf, sizeof(sbuf))); |
bd90517b JO |
45 | goto out_evsel_delete; |
46 | } | |
47 | ||
48 | for (cpu = 0; cpu < cpus->nr; ++cpu) { | |
43f322b4 | 49 | unsigned int ncalls = nr_openat_calls + cpu; |
bd90517b JO |
50 | /* |
51 | * XXX eventually lift this restriction in a way that | |
52 | * keeps perf building on older glibc installations | |
53 | * without CPU_ALLOC. 1024 cpus in 2010 still seems | |
54 | * a reasonable upper limit tho :-) | |
55 | */ | |
56 | if (cpus->map[cpu] >= CPU_SETSIZE) { | |
57 | pr_debug("Ignoring CPU %d\n", cpus->map[cpu]); | |
58 | continue; | |
59 | } | |
60 | ||
61 | CPU_SET(cpus->map[cpu], &cpu_set); | |
62 | if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { | |
63 | pr_debug("sched_setaffinity() failed on CPU %d: %s ", | |
64 | cpus->map[cpu], | |
ba3dfff8 | 65 | strerror_r(errno, sbuf, sizeof(sbuf))); |
bd90517b JO |
66 | goto out_close_fd; |
67 | } | |
68 | for (i = 0; i < ncalls; ++i) { | |
43f322b4 | 69 | fd = openat(0, "/etc/passwd", O_RDONLY); |
bd90517b JO |
70 | close(fd); |
71 | } | |
72 | CPU_CLR(cpus->map[cpu], &cpu_set); | |
73 | } | |
74 | ||
75 | /* | |
76 | * Here we need to explicitely preallocate the counts, as if | |
77 | * we use the auto allocation it will allocate just for 1 cpu, | |
78 | * as we start by cpu 0. | |
79 | */ | |
80 | if (perf_evsel__alloc_counts(evsel, cpus->nr) < 0) { | |
81 | pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr); | |
82 | goto out_close_fd; | |
83 | } | |
84 | ||
85 | err = 0; | |
86 | ||
87 | for (cpu = 0; cpu < cpus->nr; ++cpu) { | |
88 | unsigned int expected; | |
89 | ||
90 | if (cpus->map[cpu] >= CPU_SETSIZE) | |
91 | continue; | |
92 | ||
93 | if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) { | |
94 | pr_debug("perf_evsel__read_on_cpu\n"); | |
95 | err = -1; | |
96 | break; | |
97 | } | |
98 | ||
43f322b4 | 99 | expected = nr_openat_calls + cpu; |
bd90517b JO |
100 | if (evsel->counts->cpu[cpu].val != expected) { |
101 | pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n", | |
102 | expected, cpus->map[cpu], evsel->counts->cpu[cpu].val); | |
103 | err = -1; | |
104 | } | |
105 | } | |
106 | ||
43f8e76e | 107 | perf_evsel__free_counts(evsel); |
bd90517b JO |
108 | out_close_fd: |
109 | perf_evsel__close_fd(evsel, 1, threads->nr); | |
110 | out_evsel_delete: | |
111 | perf_evsel__delete(evsel); | |
112 | out_thread_map_delete: | |
113 | thread_map__delete(threads); | |
114 | return err; | |
115 | } |