]> git.kernelconcepts.de Git - karo-tx-linux.git/blob - tools/perf/tests/openat-syscall-all-cpus.c
Merge branch 'perf/urgent' into perf/core, before pulling new changes
[karo-tx-linux.git] / tools / perf / tests / openat-syscall-all-cpus.c
1 #include <api/fs/fs.h>
2 #include <linux/err.h>
3 #include "evsel.h"
4 #include "tests.h"
5 #include "thread_map.h"
6 #include "cpumap.h"
7 #include "debug.h"
8 #include "stat.h"
9
10 int test__openat_syscall_event_on_all_cpus(void)
11 {
12         int err = -1, fd, cpu;
13         struct cpu_map *cpus;
14         struct perf_evsel *evsel;
15         unsigned int nr_openat_calls = 111, i;
16         cpu_set_t cpu_set;
17         struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
18         char sbuf[STRERR_BUFSIZE];
19         char errbuf[BUFSIZ];
20
21         if (threads == NULL) {
22                 pr_debug("thread_map__new\n");
23                 return -1;
24         }
25
26         cpus = cpu_map__new(NULL);
27         if (cpus == NULL) {
28                 pr_debug("cpu_map__new\n");
29                 goto out_thread_map_delete;
30         }
31
32         CPU_ZERO(&cpu_set);
33
34         evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
35         if (IS_ERR(evsel)) {
36                 tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
37                 pr_err("%s\n", errbuf);
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",
44                          strerror_r(errno, sbuf, sizeof(sbuf)));
45                 goto out_evsel_delete;
46         }
47
48         for (cpu = 0; cpu < cpus->nr; ++cpu) {
49                 unsigned int ncalls = nr_openat_calls + cpu;
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],
65                                  strerror_r(errno, sbuf, sizeof(sbuf)));
66                         goto out_close_fd;
67                 }
68                 for (i = 0; i < ncalls; ++i) {
69                         fd = openat(0, "/etc/passwd", O_RDONLY);
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, 1) < 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
99                 expected = nr_openat_calls + cpu;
100                 if (perf_counts(evsel->counts, cpu, 0)->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], perf_counts(evsel->counts, cpu, 0)->val);
103                         err = -1;
104                 }
105         }
106
107         perf_evsel__free_counts(evsel);
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__put(threads);
114         return err;
115 }