diff options
| -rw-r--r-- | tools/perf/tests/Build | 1 | ||||
| -rw-r--r-- | tools/perf/tests/builtin-test.c | 4 | ||||
| -rw-r--r-- | tools/perf/tests/sdt.c | 115 | ||||
| -rw-r--r-- | tools/perf/tests/tests.h | 1 |
4 files changed, 121 insertions, 0 deletions
diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build index 66a28982547b..4158422cc2a6 100644 --- a/tools/perf/tests/Build +++ b/tools/perf/tests/Build @@ -39,6 +39,7 @@ perf-y += stat.o perf-y += event_update.o perf-y += event-times.o perf-y += backward-ring-buffer.o +perf-y += sdt.o $(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c tests/Build $(call rule_mkdir) diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c index c23cbf733549..4dd2d050788a 100644 --- a/tools/perf/tests/builtin-test.c +++ b/tools/perf/tests/builtin-test.c @@ -218,6 +218,10 @@ static struct test generic_tests[] = { .func = test__cpu_map_print, }, { + .desc = "Test SDT event probing", + .func = test__sdt_event, + }, + { .func = NULL, }, }; diff --git a/tools/perf/tests/sdt.c b/tools/perf/tests/sdt.c new file mode 100644 index 000000000000..f59d210e1baf --- /dev/null +++ b/tools/perf/tests/sdt.c @@ -0,0 +1,115 @@ +#include <stdio.h> +#include <sys/epoll.h> +#include <util/util.h> +#include <util/evlist.h> +#include <linux/filter.h> +#include "tests.h" +#include "debug.h" +#include "probe-file.h" +#include "build-id.h" + +/* To test SDT event, we need libelf support to scan elf binary */ +#if defined(HAVE_SDT_EVENT) && defined(HAVE_LIBELF_SUPPORT) + +#include <sys/sdt.h> + +static int target_function(void) +{ + DTRACE_PROBE(perf, test_target); + return TEST_OK; +} + +/* Copied from builtin-buildid-cache.c */ +static int build_id_cache__add_file(const char *filename) +{ + char sbuild_id[SBUILD_ID_SIZE]; + u8 build_id[BUILD_ID_SIZE]; + int err; + + err = filename__read_build_id(filename, &build_id, sizeof(build_id)); + if (err < 0) { + pr_debug("Failed to read build id of %s\n", filename); + return err; + } + + build_id__sprintf(build_id, sizeof(build_id), sbuild_id); + err = build_id_cache__add_s(sbuild_id, filename, false, false); + if (err < 0) + pr_debug("Failed to add build id cache of %s\n", filename); + return err; +} + +static char *get_self_path(void) +{ + char *buf = calloc(PATH_MAX, sizeof(char)); + + if (buf && readlink("/proc/self/exe", buf, PATH_MAX) < 0) { + pr_debug("Failed to get correct path of perf\n"); + free(buf); + return NULL; + } + return buf; +} + +static int search_cached_probe(const char *target, + const char *group, const char *event) +{ + struct probe_cache *cache = probe_cache__new(target); + int ret = 0; + + if (!cache) { + pr_debug("Failed to open probe cache of %s\n", target); + return -EINVAL; + } + + if (!probe_cache__find_by_name(cache, group, event)) { + pr_debug("Failed to find %s:%s in the cache\n", group, event); + ret = -ENOENT; + } + probe_cache__delete(cache); + + return ret; +} + +int test__sdt_event(int subtests __maybe_unused) +{ + int ret = TEST_FAIL; + char __tempdir[] = "./test-buildid-XXXXXX"; + char *tempdir = NULL, *myself = get_self_path(); + + if (myself == NULL || mkdtemp(__tempdir) == NULL) { + pr_debug("Failed to make a tempdir for build-id cache\n"); + goto error; + } + /* Note that buildid_dir must be an absolute path */ + tempdir = realpath(__tempdir, NULL); + + /* At first, scan itself */ + set_buildid_dir(tempdir); + if (build_id_cache__add_file(myself) < 0) + goto error_rmdir; + + /* Open a cache and make sure the SDT is stored */ + if (search_cached_probe(myself, "sdt_perf", "test_target") < 0) + goto error_rmdir; + + /* TBD: probing on the SDT event and collect logs */ + + /* Call the target and get an event */ + ret = target_function(); + +error_rmdir: + /* Cleanup temporary buildid dir */ + rm_rf(tempdir); +error: + free(tempdir); + free(myself); + return ret; +} +#else +int test__sdt_event(int subtests __maybe_unused) +{ + pr_debug("Skip SDT event test because SDT support is not compiled\n"); + return TEST_SKIP; +} +#endif diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h index 52f969570c97..a0288f8092b2 100644 --- a/tools/perf/tests/tests.h +++ b/tools/perf/tests/tests.h @@ -88,6 +88,7 @@ int test__event_update(int subtest); int test__event_times(int subtest); int test__backward_ring_buffer(int subtest); int test__cpu_map_print(int subtest); +int test__sdt_event(int subtest); #if defined(__arm__) || defined(__aarch64__) #ifdef HAVE_DWARF_UNWIND_SUPPORT |