1#include "evsel.h"
2#include "tests.h"
3#include "thread_map.h"
4#include "cpumap.h"
5#include "debug.h"
6
7int test__open_syscall_event_on_all_cpus(void)
8{
9	int err = -1, fd, cpu;
10	struct cpu_map *cpus;
11	struct perf_evsel *evsel;
12	unsigned int nr_open_calls = 111, i;
13	cpu_set_t cpu_set;
14	struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
15	char sbuf[STRERR_BUFSIZE];
16
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
28	CPU_ZERO(&cpu_set);
29
30	evsel = perf_evsel__newtp("syscalls", "sys_enter_open");
31	if (evsel == NULL) {
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");
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_open_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 = open("/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) < 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_open_calls + cpu;
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
107	perf_evsel__free_counts(evsel);
108out_close_fd:
109	perf_evsel__close_fd(evsel, 1, threads->nr);
110out_evsel_delete:
111	perf_evsel__delete(evsel);
112out_thread_map_delete:
113	thread_map__delete(threads);
114	return err;
115}
116