Hi, I added a test case for this. Please take a look on it too. This patch is based on my previous evlist cleanup patchset:
https://lkml.org/lkml/2013/3/15/47 Thanks, Namhyung >From df86ff1984a2ab89331a10f5e1fc93f09e260ed9 Mon Sep 17 00:00:00 2001 From: Namhyung Kim <namhyung....@lge.com> Date: Fri, 15 Mar 2013 14:58:11 +0900 Subject: [PATCH] perf test: Add test case for checking number of EXIT events The test__task_exit() runs a simple "/usr/bin/true" workload and then checks whether the number of EXIT event is 1 or not. Cc: Jiri Olsa <jo...@redhat.com> Signed-off-by: Namhyung Kim <namhy...@kernel.org> --- tools/perf/Makefile | 1 + tools/perf/tests/builtin-test.c | 4 ++ tools/perf/tests/task-exit.c | 123 ++++++++++++++++++++++++++++++++++++++++ tools/perf/tests/tests.h | 1 + 4 files changed, 129 insertions(+) create mode 100644 tools/perf/tests/task-exit.c diff --git a/tools/perf/Makefile b/tools/perf/Makefile index 3dcd6273a90b..0145df853af4 100644 --- a/tools/perf/Makefile +++ b/tools/perf/Makefile @@ -511,6 +511,7 @@ LIB_OBJS += $(OUTPUT)tests/evsel-tp-sched.o LIB_OBJS += $(OUTPUT)tests/pmu.o LIB_OBJS += $(OUTPUT)tests/hists_link.o LIB_OBJS += $(OUTPUT)tests/python-use.o +LIB_OBJS += $(OUTPUT)tests/task-exit.o BUILTIN_OBJS += $(OUTPUT)builtin-annotate.o BUILTIN_OBJS += $(OUTPUT)builtin-bench.o diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c index acb98e0e39f2..dd00e5e444f8 100644 --- a/tools/perf/tests/builtin-test.c +++ b/tools/perf/tests/builtin-test.c @@ -78,6 +78,10 @@ static struct test { .func = test__python_use, }, { + .desc = "Test number of exit event of a simple workload", + .func = test__task_exit, + }, + { .func = NULL, }, }; diff --git a/tools/perf/tests/task-exit.c b/tools/perf/tests/task-exit.c new file mode 100644 index 000000000000..28fe5894b061 --- /dev/null +++ b/tools/perf/tests/task-exit.c @@ -0,0 +1,123 @@ +#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) +{ + exited = 1; + + if (sig == SIGUSR1) + 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 perf_target target = { + .uid = UINT_MAX, + .uses_mmap = true, + }; + const char *argv[] = { "true", NULL }; + + signal(SIGCHLD, sig_handler); + signal(SIGUSR1, sig_handler); + + evlist = perf_evlist__new(); + if (evlist == NULL) { + pr_debug("perf_evlist__new\n"); + return -1; + } + /* + * We need at least one evsel in the evlist, use the default + * one: "cycles". + */ + err = perf_evlist__add_default(evlist); + if (err < 0) { + pr_debug("Not enough memory to create evsel\n"); + goto out_free_evlist; + } + + /* + * 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_maps; + } + + err = perf_evlist__prepare_workload(evlist, &target, argv, false, true); + if (err < 0) { + pr_debug("Couldn't run the workload!\n"); + goto out_delete_maps; + } + + 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(-err)); + goto out_delete_maps; + } + + if (perf_evlist__mmap(evlist, 128, true) < 0) { + pr_debug("failed to mmap events: %d (%s)\n", errno, + strerror(errno)); + goto out_close_evlist; + } + + perf_evlist__start_workload(evlist); + +retry: + while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { + if (event->header.type != PERF_RECORD_EXIT) + continue; + + nr_exit++; + } + + if (!exited || !nr_exit) { + poll(evlist->pollfd, evlist->nr_fds, -1); + goto retry; + } + + if (nr_exit != 1) { + pr_debug("received %d EXIT records\n", nr_exit); + err = -1; + } + + perf_evlist__munmap(evlist); +out_close_evlist: + perf_evlist__close(evlist); +out_delete_maps: + perf_evlist__delete_maps(evlist); +out_free_evlist: + perf_evlist__delete(evlist); + return err; +} diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h index 5de0be1ff4b6..4590c10b7e65 100644 --- a/tools/perf/tests/tests.h +++ b/tools/perf/tests/tests.h @@ -23,5 +23,6 @@ int test__dso_data(void); int test__parse_events(void); int test__hists_link(void); int test__python_use(void); +int test__task_exit(void); #endif /* TESTS_H */ -- 1.8.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
