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From: Masami Hiramatsu <mhiramat@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>,
	linux-kernel@vger.kernel.org, Namhyung Kim <namhyung@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Hemant Kumar <hemant@linux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>,
	Brendan Gregg <brendan.d.gregg@gmail.com>
Subject: [PATCH perf/core v10 23/23] perf-test: Add a test case for SDT event
Date: Wed,  8 Jun 2016 20:16:33 +0900	[thread overview]
Message-ID: <20160608111628.29298.28177.stgit@devbox> (raw)
In-Reply-To: <20160608092854.3116.29007.stgit@devbox>
In-Reply-To: <20160608092854.3116.29007.stgit@devbox>

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.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 tools/perf/tests/Build          |    1 
 tools/perf/tests/builtin-test.c |    4 +
 tools/perf/tests/sdt.c          |  114 +++++++++++++++++++++++++++++++++++++++
 tools/perf/tests/tests.h        |    1 
 4 files changed, 120 insertions(+)
 create mode 100644 tools/perf/tests/sdt.c

diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index 66a2898..4158422 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 0e95c20..c0e0ccb 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -212,6 +212,10 @@ static struct test generic_tests[] = {
 		.func = test__backward_ring_buffer,
 	},
 	{
+		.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 0000000..d11065e
--- /dev/null
+++ b/tools/perf/tests/sdt.c
@@ -0,0 +1,114 @@
+#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 c57e72c..93cfb0b 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -87,6 +87,7 @@ int test__synthesize_stat_round(int subtest);
 int test__event_update(int subtest);
 int test__event_times(int subtest);
 int test__backward_ring_buffer(int subtest);
+int test__sdt_event(int subtest);
 
 #if defined(__arm__) || defined(__aarch64__)
 #ifdef HAVE_DWARF_UNWIND_SUPPORT

      parent reply	other threads:[~2016-06-08 11:16 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-08  9:29 [PATCH perf/core v10 00/23] perf-probe --cache and SDT support Masami Hiramatsu
2016-06-08  9:29 ` [PATCH perf/core v10 01/23] perf: util: Fix rm_rf() to handle non-regular files correctly Masami Hiramatsu
2016-06-16  8:31   ` [tip:perf/core] perf tools: " tip-bot for Masami Hiramatsu
2016-06-08  9:29 ` [PATCH perf/core v10 02/23] perf-probe: Fix to add NULL check for strndup Masami Hiramatsu
2016-06-16  8:32   ` [tip:perf/core] perf probe: " tip-bot for Masami Hiramatsu
2016-06-08  9:29 ` [PATCH perf/core v10 03/23] perf-buildid: Rename and export build_id_cache__cachedir() Masami Hiramatsu
2016-06-16  8:32   ` [tip:perf/core] perf buildid: " tip-bot for Masami Hiramatsu
2016-06-08  9:29 ` [PATCH perf/core v10 04/23] perf probe: Add perf_probe_event__copy() Masami Hiramatsu
2016-06-16  8:33   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2016-06-08  9:29 ` [PATCH perf/core v10 05/23] perf probe: Recover and export synthesize_perf_probe_point() Masami Hiramatsu
2016-06-16  8:33   ` [tip:perf/core] perf probe: Uncomment " tip-bot for Masami Hiramatsu
2016-06-08  9:29 ` [PATCH perf/core v10 06/23] perf probe-file: Introduce perf_cache interfaces Masami Hiramatsu
2016-06-09 14:16   ` Arnaldo Carvalho de Melo
2016-06-10 22:18     ` Masami Hiramatsu
2016-06-08  9:30 ` [PATCH perf/core v10 07/23] perf probe: Add --cache option to cache the probe definitions Masami Hiramatsu
2016-06-09 14:18   ` Arnaldo Carvalho de Melo
2016-06-10 23:32     ` Masami Hiramatsu
2016-06-08  9:30 ` [PATCH perf/core v10 08/23] perf probe: Use cache entry if possible Masami Hiramatsu
2016-06-08  9:30 ` [PATCH perf/core v10 09/23] perf probe: Show all cached probes Masami Hiramatsu
2016-06-09 14:22   ` Arnaldo Carvalho de Melo
2016-06-11  0:28     ` Masami Hiramatsu
2016-06-12  3:20       ` Masami Hiramatsu
2016-06-08  9:30 ` [PATCH perf/core v10 10/23] perf probe: Remove caches when --cache is given Masami Hiramatsu
2016-06-09 14:28   ` Arnaldo Carvalho de Melo
2016-06-11  1:17     ` Masami Hiramatsu
2016-06-08  9:30 ` [PATCH perf/core v10 11/23] perf/sdt: ELF support for SDT Masami Hiramatsu
2016-06-08  9:31 ` [PATCH perf/core v10 12/23] perf probe: Add group name support Masami Hiramatsu
2016-06-08  9:31 ` [PATCH perf/core v10 13/23] perf buildid-cache: Scan and import user SDT events to probe cache Masami Hiramatsu
2016-06-08  9:31 ` [PATCH perf/core v10 14/23] perf probe: Accept %sdt and %cached event name Masami Hiramatsu
2016-06-08  9:31 ` [PATCH perf/core v10 15/23] perf-list: Show SDT and pre-cached events Masami Hiramatsu
2016-06-08  9:31 ` [PATCH perf/core v10 16/23] perf-list: Skip SDTs placed in invalid binaries Masami Hiramatsu
2016-06-08  9:31 ` [PATCH perf/core v10 17/23] perf: probe-cache: Add for_each_probe_cache_entry() wrapper Masami Hiramatsu
2016-06-08  9:31 ` [PATCH perf/core v10 18/23] perf probe: Allow wildcard for cached events Masami Hiramatsu
2016-06-08  9:32 ` [PATCH perf/core v10 19/23] perf probe: Search SDT/cached event from all probe caches Masami Hiramatsu
2016-06-08  9:32 ` [PATCH perf/core v10 20/23] perf probe: Support @BUILDID or @FILE suffix for SDT events Masami Hiramatsu
2016-06-08  9:32 ` [PATCH perf/core v10 21/23] perf probe: Support a special SDT probe format Masami Hiramatsu
2016-06-08  9:32 ` [PATCH perf/core v10 22/23] perf build: Add sdt feature detection Masami Hiramatsu
2016-06-08  9:32 ` [PATCH perf/core v10 23/23] perf-test: Add a test case for SDT event Masami Hiramatsu
2016-06-08 11:13 ` [PATCH perf/core v10 00/23] perf-probe --cache and SDT support Masami Hiramatsu
2016-06-08 11:15 ` [PATCH perf/core v10 22/23] perf build: Add sdt feature detection Masami Hiramatsu
2016-06-08 11:16 ` Masami Hiramatsu [this message]

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