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");
 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}