diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
---|---|---|
committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /tools/perf/tests/task-exit.c |
Initial import
Diffstat (limited to 'tools/perf/tests/task-exit.c')
-rw-r--r-- | tools/perf/tests/task-exit.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/tools/perf/tests/task-exit.c b/tools/perf/tests/task-exit.c new file mode 100644 index 000000000..3a8fedef8 --- /dev/null +++ b/tools/perf/tests/task-exit.c @@ -0,0 +1,120 @@ +#include "evlist.h" +#include "evsel.h" +#include "thread_map.h" +#include "cpumap.h" +#include "tests.h" + +#include <signal.h> + +static int exited; +static int nr_exit; + +static void sig_handler(int sig __maybe_unused) +{ + exited = 1; +} + +/* + * perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since + * we asked by setting its exec_error to this handler. + */ +static void workload_exec_failed_signal(int signo __maybe_unused, + siginfo_t *info __maybe_unused, + void *ucontext __maybe_unused) +{ + exited = 1; + nr_exit = -1; +} + +/* + * This test will start a workload that does nothing then it checks + * if the number of exit event reported by the kernel is 1 or not + * in order to check the kernel returns correct number of event. + */ +int test__task_exit(void) +{ + int err = -1; + union perf_event *event; + struct perf_evsel *evsel; + struct perf_evlist *evlist; + struct target target = { + .uid = UINT_MAX, + .uses_mmap = true, + }; + const char *argv[] = { "true", NULL }; + char sbuf[STRERR_BUFSIZE]; + + signal(SIGCHLD, sig_handler); + + evlist = perf_evlist__new_default(); + if (evlist == NULL) { + pr_debug("perf_evlist__new_default\n"); + return -1; + } + + /* + * Create maps of threads and cpus to monitor. In this case + * we start with all threads and cpus (-1, -1) but then in + * perf_evlist__prepare_workload we'll fill in the only thread + * we're monitoring, the one forked there. + */ + evlist->cpus = cpu_map__dummy_new(); + evlist->threads = thread_map__new_by_tid(-1); + if (!evlist->cpus || !evlist->threads) { + err = -ENOMEM; + pr_debug("Not enough memory to create thread/cpu maps\n"); + goto out_delete_evlist; + } + + err = perf_evlist__prepare_workload(evlist, &target, argv, false, + workload_exec_failed_signal); + if (err < 0) { + pr_debug("Couldn't run the workload!\n"); + goto out_delete_evlist; + } + + evsel = perf_evlist__first(evlist); + evsel->attr.task = 1; + evsel->attr.sample_freq = 0; + evsel->attr.inherit = 0; + evsel->attr.watermark = 0; + evsel->attr.wakeup_events = 1; + evsel->attr.exclude_kernel = 1; + + err = perf_evlist__open(evlist); + if (err < 0) { + pr_debug("Couldn't open the evlist: %s\n", + strerror_r(-err, sbuf, sizeof(sbuf))); + goto out_delete_evlist; + } + + if (perf_evlist__mmap(evlist, 128, true) < 0) { + pr_debug("failed to mmap events: %d (%s)\n", errno, + strerror_r(errno, sbuf, sizeof(sbuf))); + goto out_delete_evlist; + } + + perf_evlist__start_workload(evlist); + +retry: + while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { + if (event->header.type == PERF_RECORD_EXIT) + nr_exit++; + + perf_evlist__mmap_consume(evlist, 0); + } + + if (!exited || !nr_exit) { + perf_evlist__poll(evlist, -1); + goto retry; + } + + if (nr_exit != 1) { + pr_debug("received %d EXIT records\n", nr_exit); + err = -1; + } + +out_delete_evlist: + perf_evlist__delete(evlist); + return err; +} |