| #include <inttypes.h> |
| /* For the CPU_* macros */ |
| #include <pthread.h> |
| |
| #include <api/fs/fs.h> |
| #include <linux/err.h> |
| #include "evsel.h" |
| #include "tests.h" |
| #include "thread_map.h" |
| #include "cpumap.h" |
| #include "debug.h" |
| #include "stat.h" |
| |
| int test__openat_syscall_event_on_all_cpus(int subtest __maybe_unused) |
| { |
| int err = -1, fd, cpu; |
| struct cpu_map *cpus; |
| struct perf_evsel *evsel; |
| unsigned int nr_openat_calls = 111, i; |
| cpu_set_t cpu_set; |
| struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX); |
| char sbuf[STRERR_BUFSIZE]; |
| char errbuf[BUFSIZ]; |
| |
| if (threads == NULL) { |
| pr_debug("thread_map__new\n"); |
| return -1; |
| } |
| |
| cpus = cpu_map__new(NULL); |
| if (cpus == NULL) { |
| pr_debug("cpu_map__new\n"); |
| goto out_thread_map_delete; |
| } |
| |
| CPU_ZERO(&cpu_set); |
| |
| evsel = perf_evsel__newtp("syscalls", "sys_enter_openat"); |
| if (IS_ERR(evsel)) { |
| tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat"); |
| pr_debug("%s\n", errbuf); |
| goto out_thread_map_delete; |
| } |
| |
| if (perf_evsel__open(evsel, cpus, threads) < 0) { |
| pr_debug("failed to open counter: %s, " |
| "tweak /proc/sys/kernel/perf_event_paranoid?\n", |
| str_error_r(errno, sbuf, sizeof(sbuf))); |
| goto out_evsel_delete; |
| } |
| |
| for (cpu = 0; cpu < cpus->nr; ++cpu) { |
| unsigned int ncalls = nr_openat_calls + cpu; |
| /* |
| * XXX eventually lift this restriction in a way that |
| * keeps perf building on older glibc installations |
| * without CPU_ALLOC. 1024 cpus in 2010 still seems |
| * a reasonable upper limit tho :-) |
| */ |
| if (cpus->map[cpu] >= CPU_SETSIZE) { |
| pr_debug("Ignoring CPU %d\n", cpus->map[cpu]); |
| continue; |
| } |
| |
| CPU_SET(cpus->map[cpu], &cpu_set); |
| if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { |
| pr_debug("sched_setaffinity() failed on CPU %d: %s ", |
| cpus->map[cpu], |
| str_error_r(errno, sbuf, sizeof(sbuf))); |
| goto out_close_fd; |
| } |
| for (i = 0; i < ncalls; ++i) { |
| fd = openat(0, "/etc/passwd", O_RDONLY); |
| close(fd); |
| } |
| CPU_CLR(cpus->map[cpu], &cpu_set); |
| } |
| |
| /* |
| * Here we need to explicitly preallocate the counts, as if |
| * we use the auto allocation it will allocate just for 1 cpu, |
| * as we start by cpu 0. |
| */ |
| if (perf_evsel__alloc_counts(evsel, cpus->nr, 1) < 0) { |
| pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr); |
| goto out_close_fd; |
| } |
| |
| err = 0; |
| |
| for (cpu = 0; cpu < cpus->nr; ++cpu) { |
| unsigned int expected; |
| |
| if (cpus->map[cpu] >= CPU_SETSIZE) |
| continue; |
| |
| if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) { |
| pr_debug("perf_evsel__read_on_cpu\n"); |
| err = -1; |
| break; |
| } |
| |
| expected = nr_openat_calls + cpu; |
| if (perf_counts(evsel->counts, cpu, 0)->val != expected) { |
| pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n", |
| expected, cpus->map[cpu], perf_counts(evsel->counts, cpu, 0)->val); |
| err = -1; |
| } |
| } |
| |
| perf_evsel__free_counts(evsel); |
| out_close_fd: |
| perf_evsel__close_fd(evsel, 1, threads->nr); |
| out_evsel_delete: |
| perf_evsel__delete(evsel); |
| out_thread_map_delete: |
| thread_map__put(threads); |
| return err; |
| } |