diff options
| -rw-r--r-- | tools/perf/builtin-test.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/tools/perf/builtin-test.c b/tools/perf/builtin-test.c index e0c3f471f22..6c991529f62 100644 --- a/tools/perf/builtin-test.c +++ b/tools/perf/builtin-test.c @@ -234,6 +234,85 @@ out: return err; } +#include "util/evsel.h" +#include <sys/types.h> + +static int trace_event__id(const char *event_name) +{ + char *filename; + int err = -1, fd; + + if (asprintf(&filename, + "/sys/kernel/debug/tracing/events/syscalls/%s/id", + event_name) < 0) + return -1; + + fd = open(filename, O_RDONLY); + if (fd >= 0) { + char id[16]; + if (read(fd, id, sizeof(id)) > 0) + err = atoi(id); + close(fd); + } + + free(filename); + return err; +} + +static int test__open_syscall_event(void) +{ + int err = -1, fd; + struct thread_map *threads; + struct perf_evsel *evsel; + unsigned int nr_open_calls = 111, i; + int id = trace_event__id("sys_enter_open"); + + if (id < 0) { + pr_debug("trace_event__id(\"sys_enter_open\") "); + return -1; + } + + threads = thread_map__new(-1, getpid()); + if (threads == NULL) { + pr_debug("thread_map__new "); + return -1; + } + + evsel = perf_evsel__new(PERF_TYPE_TRACEPOINT, id, 0); + if (evsel == NULL) { + pr_debug("perf_evsel__new "); + goto out_thread_map_delete; + } + + if (perf_evsel__open_per_thread(evsel, threads) < 0) { + pr_debug("perf_evsel__open_per_thread "); + goto out_evsel_delete; + } + + for (i = 0; i < nr_open_calls; ++i) { + fd = open("/etc/passwd", O_RDONLY); + close(fd); + } + + if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) { + pr_debug("perf_evsel__open_read_on_cpu "); + goto out_close_fd; + } + + if (evsel->counts->cpu[0].val != nr_open_calls) + pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %Ld ", + nr_open_calls, evsel->counts->cpu[0].val); + + err = 0; +out_close_fd: + perf_evsel__close_fd(evsel, 1, threads->nr); +out_evsel_delete: + perf_evsel__delete(evsel); +out_thread_map_delete: + thread_map__delete(threads); + return err; +} + static struct test { const char *desc; int (*func)(void); @@ -243,6 +322,10 @@ static struct test { .func = test__vmlinux_matches_kallsyms, }, { + .desc = "detect open syscall event", + .func = test__open_syscall_event, + }, + { .func = NULL, }, }; |