linux-kernel - [PATCH 15/48] perf tools: Add a test case for thread comm handling

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Date:   Thu, 13 Sep 2018 14:54:17 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Frederic Weisbecker <fweisbec@...il.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andi Kleen <andi@...stfloor.org>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>
Subject: [PATCH 15/48] perf tools: Add a test case for thread comm handling

From: Namhyung Kim <namhyung@...nel.org>

The new test case checks various thread comm handling APIs like
overridding and time sorting.

Cc: Frederic Weisbecker <fweisbec@...il.com>
Link: http://lkml.kernel.org/n/tip-b31f0pktgl0k2dba3lqp159w@git.kernel.org
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/tests/Build          |  1 +
 tools/perf/tests/builtin-test.c |  4 +++
 tools/perf/tests/tests.h        |  1 +
 tools/perf/tests/thread-comm.c  | 48 +++++++++++++++++++++++++++++++++
 4 files changed, 54 insertions(+)
 create mode 100644 tools/perf/tests/thread-comm.c

diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index 6c108fa79ae3..713fc29871e2 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -24,6 +24,7 @@ perf-y += bp_account.o
 perf-y += task-exit.o
 perf-y += sw-clock.o
 perf-y += mmap-thread-lookup.o
+perf-y += thread-comm.o
 perf-y += thread-mg-share.o
 perf-y += switch-tracking.o
 perf-y += keep-tracking.o
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index d7a5e1b9aa6f..982e5f64df62 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -279,6 +279,10 @@ static struct test generic_tests[] = {
 		.desc = "mem2node",
 		.func = test__mem2node,
 	},
+	{
+		.desc = "Test thread comm handling",
+		.func = test__thread_comm,
+	},
 	{
 		.func = NULL,
 	},
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index a9760e790563..5d16a56f262f 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -104,6 +104,7 @@ const char *test__clang_subtest_get_desc(int subtest);
 int test__clang_subtest_get_nr(void);
 int test__unit_number__scnprint(struct test *test, int subtest);
 int test__mem2node(struct test *t, int subtest);
+int test__thread_comm(struct test *test, int subtest);
 
 bool test__bp_signal_is_supported(void);
 
diff --git a/tools/perf/tests/thread-comm.c b/tools/perf/tests/thread-comm.c
new file mode 100644
index 000000000000..9fcfd2c43488
--- /dev/null
+++ b/tools/perf/tests/thread-comm.c
@@ -0,0 +1,48 @@
+#include <linux/compiler.h>
+#include "tests.h"
+#include "machine.h"
+#include "thread.h"
+#include "debug.h"
+
+int test__thread_comm(struct test *test __maybe_unused, int subtest __maybe_unused)
+{
+	struct machines machines;
+	struct machine *machine;
+	struct thread *t;
+
+	/*
+	 * This test is to check whether it can retrieve a correct
+	 * comm for a given time.  When multi-file data storage is
+	 * enabled, those task/comm events are processed first so the
+	 * later sample should find a matching comm properly.
+	 */
+	machines__init(&machines);
+	machine = &machines.host;
+
+	t = machine__findnew_thread(machine, 100, 100);
+	TEST_ASSERT_VAL("wrong init thread comm",
+			!strcmp(thread__comm_str(t), ":100"));
+
+	thread__set_comm(t, "perf-test1", 10000);
+	TEST_ASSERT_VAL("failed to override thread comm",
+			!strcmp(thread__comm_str(t), "perf-test1"));
+
+	thread__set_comm(t, "perf-test2", 20000);
+	thread__set_comm(t, "perf-test3", 30000);
+	thread__set_comm(t, "perf-test4", 40000);
+
+	TEST_ASSERT_VAL("failed to find timed comm",
+			!strcmp(thread__comm_str_by_time(t, 20000), "perf-test2"));
+	TEST_ASSERT_VAL("failed to find timed comm",
+			!strcmp(thread__comm_str_by_time(t, 35000), "perf-test3"));
+	TEST_ASSERT_VAL("failed to find timed comm",
+			!strcmp(thread__comm_str_by_time(t, 50000), "perf-test4"));
+
+	thread__set_comm(t, "perf-test1.5", 15000);
+	TEST_ASSERT_VAL("failed to sort timed comm",
+			!strcmp(thread__comm_str_by_time(t, 15000), "perf-test1.5"));
+
+	machine__delete_threads(machine);
+	machines__exit(&machines);
+	return 0;
+}
-- 
2.17.1