Commit 8e5dc848 authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/146831796546.17065.1502584370844087537.stgit@devbox


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent e26e63be

tools/perf/tests/Build

+1 −0
Original line number Diff line number Diff line
@@ -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)

tools/perf/tests/builtin-test.c

+4 −0
Original line number Diff line number Diff line
@@ -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,

	},

tools/perf/tests/sdt.c

0 → 100644
+115 −0
Original line number Diff line number Diff line 
#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

tools/perf/tests/tests.h

+1 −0
Original line number Diff line number Diff line
@@ -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

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