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
16	if (threads == NULL) {
17		pr_debug("thread_map__new\n");
18		return -1;
19	}
20
21	cpus = cpu_map__new(NULL);
22	if (cpus == NULL) {
23		pr_debug("cpu_map__new\n");
24		goto out_thread_map_delete;
25	}
26
27	CPU_ZERO(&cpu_set);
28
29	evsel = perf_evsel__newtp("syscalls", "sys_enter_open", 0);
30	if (evsel == NULL) {
31		pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
32		goto out_thread_map_delete;
33	}
34
35	if (perf_evsel__open(evsel, cpus, threads) < 0) {
36		pr_debug("failed to open counter: %s, "
37			 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
38			 strerror(errno));
39		goto out_evsel_delete;
40	}
41
42	for (cpu = 0; cpu < cpus->nr; ++cpu) {
43		unsigned int ncalls = nr_open_calls + cpu;
44		/*
45		 * XXX eventually lift this restriction in a way that
46		 * keeps perf building on older glibc installations
47		 * without CPU_ALLOC. 1024 cpus in 2010 still seems
48		 * a reasonable upper limit tho :-)
49		 */
50		if (cpus->map[cpu] >= CPU_SETSIZE) {
51			pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
52			continue;
53		}
54
55		CPU_SET(cpus->map[cpu], &cpu_set);
56		if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
57			pr_debug("sched_setaffinity() failed on CPU %d: %s ",
58				 cpus->map[cpu],
59				 strerror(errno));
60			goto out_close_fd;
61		}
62		for (i = 0; i < ncalls; ++i) {
63			fd = open("/etc/passwd", O_RDONLY);
64			close(fd);
65		}
66		CPU_CLR(cpus->map[cpu], &cpu_set);
67	}
68
69	/*
70	 * Here we need to explicitely preallocate the counts, as if
71	 * we use the auto allocation it will allocate just for 1 cpu,
72	 * as we start by cpu 0.
73	 */
74	if (perf_evsel__alloc_counts(evsel, cpus->nr) < 0) {
75		pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr);
76		goto out_close_fd;
77	}
78
79	err = 0;
80
81	for (cpu = 0; cpu < cpus->nr; ++cpu) {
82		unsigned int expected;
83
84		if (cpus->map[cpu] >= CPU_SETSIZE)
85			continue;
86
87		if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
88			pr_debug("perf_evsel__read_on_cpu\n");
89			err = -1;
90			break;
91		}
92
93		expected = nr_open_calls + cpu;
94		if (evsel->counts->cpu[cpu].val != expected) {
95			pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
96				 expected, cpus->map[cpu], evsel->counts->cpu[cpu].val);
97			err = -1;
98		}
99	}
100
101	perf_evsel__free_counts(evsel);
102out_close_fd:
103	perf_evsel__close_fd(evsel, 1, threads->nr);
104out_evsel_delete:
105	perf_evsel__delete(evsel);
106out_thread_map_delete:
107	thread_map__delete(threads);
108	return err;
109}
110