1 /* For the CPU_* macros */
2 #include <pthread.h>
3
4 #include <api/fs/fs.h>
5 #include <linux/err.h>
6 #include "evsel.h"
7 #include "tests.h"
8 #include "thread_map.h"
9 #include "cpumap.h"
10 #include "debug.h"
11 #include "stat.h"
12
test__openat_syscall_event_on_all_cpus(int subtest __maybe_unused)13 int test__openat_syscall_event_on_all_cpus(int subtest __maybe_unused)
14 {
15 int err = -1, fd, cpu;
16 struct cpu_map *cpus;
17 struct perf_evsel *evsel;
18 unsigned int nr_openat_calls = 111, i;
19 cpu_set_t cpu_set;
20 struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
21 char sbuf[STRERR_BUFSIZE];
22 char errbuf[BUFSIZ];
23
24 if (threads == NULL) {
25 pr_debug("thread_map__new\n");
26 return -1;
27 }
28
29 cpus = cpu_map__new(NULL);
30 if (cpus == NULL) {
31 pr_debug("cpu_map__new\n");
32 goto out_thread_map_delete;
33 }
34
35 CPU_ZERO(&cpu_set);
36
37 evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
38 if (IS_ERR(evsel)) {
39 tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
40 pr_debug("%s\n", errbuf);
41 goto out_thread_map_delete;
42 }
43
44 if (perf_evsel__open(evsel, cpus, threads) < 0) {
45 pr_debug("failed to open counter: %s, "
46 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
47 str_error_r(errno, sbuf, sizeof(sbuf)));
48 goto out_evsel_delete;
49 }
50
51 for (cpu = 0; cpu < cpus->nr; ++cpu) {
52 unsigned int ncalls = nr_openat_calls + cpu;
53 /*
54 * XXX eventually lift this restriction in a way that
55 * keeps perf building on older glibc installations
56 * without CPU_ALLOC. 1024 cpus in 2010 still seems
57 * a reasonable upper limit tho :-)
58 */
59 if (cpus->map[cpu] >= CPU_SETSIZE) {
60 pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
61 continue;
62 }
63
64 CPU_SET(cpus->map[cpu], &cpu_set);
65 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
66 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
67 cpus->map[cpu],
68 str_error_r(errno, sbuf, sizeof(sbuf)));
69 goto out_close_fd;
70 }
71 for (i = 0; i < ncalls; ++i) {
72 fd = openat(0, "/etc/passwd", O_RDONLY);
73 close(fd);
74 }
75 CPU_CLR(cpus->map[cpu], &cpu_set);
76 }
77
78 /*
79 * Here we need to explicitly preallocate the counts, as if
80 * we use the auto allocation it will allocate just for 1 cpu,
81 * as we start by cpu 0.
82 */
83 if (perf_evsel__alloc_counts(evsel, cpus->nr, 1) < 0) {
84 pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr);
85 goto out_close_fd;
86 }
87
88 err = 0;
89
90 for (cpu = 0; cpu < cpus->nr; ++cpu) {
91 unsigned int expected;
92
93 if (cpus->map[cpu] >= CPU_SETSIZE)
94 continue;
95
96 if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
97 pr_debug("perf_evsel__read_on_cpu\n");
98 err = -1;
99 break;
100 }
101
102 expected = nr_openat_calls + cpu;
103 if (perf_counts(evsel->counts, cpu, 0)->val != expected) {
104 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
105 expected, cpus->map[cpu], perf_counts(evsel->counts, cpu, 0)->val);
106 err = -1;
107 }
108 }
109
110 perf_evsel__free_counts(evsel);
111 out_close_fd:
112 perf_evsel__close_fd(evsel, 1, threads->nr);
113 out_evsel_delete:
114 perf_evsel__delete(evsel);
115 out_thread_map_delete:
116 thread_map__put(threads);
117 return err;
118 }
119