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Merge tag 'for-linus-4.2-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
[karo-tx-linux.git] / tools / perf / tests / openat-syscall-all-cpus.c
1 #include "evsel.h"
2 #include "tests.h"
3 #include "thread_map.h"
4 #include "cpumap.h"
5 #include "debug.h"
6 #include "stat.h"
7
8 int test__openat_syscall_event_on_all_cpus(void)
9 {
10         int err = -1, fd, cpu;
11         struct cpu_map *cpus;
12         struct perf_evsel *evsel;
13         unsigned int nr_openat_calls = 111, i;
14         cpu_set_t cpu_set;
15         struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
16         char sbuf[STRERR_BUFSIZE];
17
18         if (threads == NULL) {
19                 pr_debug("thread_map__new\n");
20                 return -1;
21         }
22
23         cpus = cpu_map__new(NULL);
24         if (cpus == NULL) {
25                 pr_debug("cpu_map__new\n");
26                 goto out_thread_map_delete;
27         }
28
29         CPU_ZERO(&cpu_set);
30
31         evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
32         if (evsel == NULL) {
33                 if (tracefs_configured())
34                         pr_debug("is tracefs mounted on /sys/kernel/tracing?\n");
35                 else if (debugfs_configured())
36                         pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
37                 else
38                         pr_debug("Neither tracefs or debugfs is enabled in this kernel\n");
39                 goto out_thread_map_delete;
40         }
41
42         if (perf_evsel__open(evsel, cpus, threads) < 0) {
43                 pr_debug("failed to open counter: %s, "
44                          "tweak /proc/sys/kernel/perf_event_paranoid?\n",
45                          strerror_r(errno, sbuf, sizeof(sbuf)));
46                 goto out_evsel_delete;
47         }
48
49         for (cpu = 0; cpu < cpus->nr; ++cpu) {
50                 unsigned int ncalls = nr_openat_calls + cpu;
51                 /*
52                  * XXX eventually lift this restriction in a way that
53                  * keeps perf building on older glibc installations
54                  * without CPU_ALLOC. 1024 cpus in 2010 still seems
55                  * a reasonable upper limit tho :-)
56                  */
57                 if (cpus->map[cpu] >= CPU_SETSIZE) {
58                         pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
59                         continue;
60                 }
61
62                 CPU_SET(cpus->map[cpu], &cpu_set);
63                 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
64                         pr_debug("sched_setaffinity() failed on CPU %d: %s ",
65                                  cpus->map[cpu],
66                                  strerror_r(errno, sbuf, sizeof(sbuf)));
67                         goto out_close_fd;
68                 }
69                 for (i = 0; i < ncalls; ++i) {
70                         fd = openat(0, "/etc/passwd", O_RDONLY);
71                         close(fd);
72                 }
73                 CPU_CLR(cpus->map[cpu], &cpu_set);
74         }
75
76         /*
77          * Here we need to explicitely preallocate the counts, as if
78          * we use the auto allocation it will allocate just for 1 cpu,
79          * as we start by cpu 0.
80          */
81         if (perf_evsel__alloc_counts(evsel, cpus->nr, 1) < 0) {
82                 pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr);
83                 goto out_close_fd;
84         }
85
86         err = 0;
87
88         for (cpu = 0; cpu < cpus->nr; ++cpu) {
89                 unsigned int expected;
90
91                 if (cpus->map[cpu] >= CPU_SETSIZE)
92                         continue;
93
94                 if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
95                         pr_debug("perf_evsel__read_on_cpu\n");
96                         err = -1;
97                         break;
98                 }
99
100                 expected = nr_openat_calls + cpu;
101                 if (perf_counts(evsel->counts, cpu, 0)->val != expected) {
102                         pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
103                                  expected, cpus->map[cpu], perf_counts(evsel->counts, cpu, 0)->val);
104                         err = -1;
105                 }
106         }
107
108         perf_evsel__free_counts(evsel);
109 out_close_fd:
110         perf_evsel__close_fd(evsel, 1, threads->nr);
111 out_evsel_delete:
112         perf_evsel__delete(evsel);
113 out_thread_map_delete:
114         thread_map__put(threads);
115         return err;
116 }