tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include "thread_map.h"
2#include "evsel.h"
3#include "debug.h"
4#include "tests.h"
5
6int test__open_syscall_event(void)
7{
8 int err = -1, fd;
9 struct perf_evsel *evsel;
10 unsigned int nr_open_calls = 111, i;
11 struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
12 char sbuf[STRERR_BUFSIZE];
13
14 if (threads == NULL) {
15 pr_debug("thread_map__new\n");
16 return -1;
17 }
18
19 evsel = perf_evsel__newtp("syscalls", "sys_enter_open");
20 if (evsel == NULL) {
21 pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
22 goto out_thread_map_delete;
23 }
24
25 if (perf_evsel__open_per_thread(evsel, threads) < 0) {
26 pr_debug("failed to open counter: %s, "
27 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
28 strerror_r(errno, sbuf, sizeof(sbuf)));
29 goto out_evsel_delete;
30 }
31
32 for (i = 0; i < nr_open_calls; ++i) {
33 fd = open("/etc/passwd", O_RDONLY);
34 close(fd);
35 }
36
37 if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
38 pr_debug("perf_evsel__read_on_cpu\n");
39 goto out_close_fd;
40 }
41
42 if (evsel->counts->cpu[0].val != nr_open_calls) {
43 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
44 nr_open_calls, evsel->counts->cpu[0].val);
45 goto out_close_fd;
46 }
47
48 err = 0;
49out_close_fd:
50 perf_evsel__close_fd(evsel, 1, threads->nr);
51out_evsel_delete:
52 perf_evsel__delete(evsel);
53out_thread_map_delete:
54 thread_map__delete(threads);
55 return err;
56}