From: Masami Hiramatsu Date: Tue, 12 Jul 2016 10:06:05 +0000 (+0900) Subject: perf test: Add a test case for SDT event X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=8e5dc848356ecf6ea8d27d641c4d7ad8d42fe92b;p=openwrt%2Fstaging%2Fblogic.git perf test: Add a test case for SDT event Add a basic test case for SDT event support. This test scans an SDT event in perftools and check whether the SDT event is correctly stored into the buildid cache. Here is an example: ---- $ perf test sdt -v 47: Test SDT event probing : --- start --- test child forked, pid 20732 Found 72 SDTs in /home/mhiramat/ksrc/linux/tools/perf/perf Writing cache: %sdt_perf:test_target=test_target Cache committed: 0 symbol:test_target file:(null) line:0 offset:0 return:0 lazy:(null) test child finished with 0 ---- end ---- Test SDT event probing: Ok ---- Signed-off-by: Masami Hiramatsu Tested-by: Arnaldo Carvalho de Melo Cc: Ananth N Mavinakayanahalli Cc: Brendan Gregg Cc: Hemant Kumar Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/146831796546.17065.1502584370844087537.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo --- 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 @@ -217,6 +217,10 @@ static struct test generic_tests[] = { .desc = "Test cpu map print", .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 +#include +#include +#include +#include +#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 + +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