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Subject[PATCH 20/48] perf tools: Add a test case for timed thread handling
Date
From: Namhyung Kim <namhyung@kernel.org>

A test case for verifying live and dead thread tree management during
time change and new machine__find{,new}_thread_time().

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/n/tip-owolpbhyg7e46jp1egd3zhyp@git.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/tests/Build | 1 +
tools/perf/tests/builtin-test.c | 4 +
tools/perf/tests/tests.h | 1 +
tools/perf/tests/thread-lookup-time.c | 181 ++++++++++++++++++++++++++
4 files changed, 187 insertions(+)
create mode 100644 tools/perf/tests/thread-lookup-time.c

diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index 713fc29871e2..715eb17d8047 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -26,6 +26,7 @@ perf-y += sw-clock.o
perf-y += mmap-thread-lookup.o
perf-y += thread-comm.o
perf-y += thread-mg-share.o
+perf-y += thread-lookup-time.o
perf-y += switch-tracking.o
perf-y += keep-tracking.o
perf-y += code-reading.o
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 982e5f64df62..c985ece3fab8 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -283,6 +283,10 @@ static struct test generic_tests[] = {
.desc = "Test thread comm handling",
.func = test__thread_comm,
},
+ {
+ .desc = "Test thread lookup with time",
+ .func = test__thread_lookup_time,
+ },
{
.func = NULL,
},
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index 5d16a56f262f..60fdc7bea1d8 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -105,6 +105,7 @@ 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);
+int test__thread_lookup_time(struct test *test, int subtest);

bool test__bp_signal_is_supported(void);

diff --git a/tools/perf/tests/thread-lookup-time.c b/tools/perf/tests/thread-lookup-time.c
new file mode 100644
index 000000000000..88e5bd5a7432
--- /dev/null
+++ b/tools/perf/tests/thread-lookup-time.c
@@ -0,0 +1,181 @@
+#include <linux/compiler.h>
+#include <inttypes.h>
+#include "tests.h"
+#include "machine.h"
+#include "thread.h"
+#include "map.h"
+#include "debug.h"
+
+static int thread__print_cb(struct thread *th, void *arg __maybe_unused)
+{
+ printf("thread: %d, start time: %"PRIu64" %s\n",
+ th->tid, th->start_time,
+ th->dead ? "(dead)" : th->exited ? "(exited)" : "");
+ return 0;
+}
+
+static int lookup_with_timestamp(struct machine *machine)
+{
+ struct thread *t1, *t2, *t3;
+ union perf_event fork_event = {
+ .fork = {
+ .pid = 0,
+ .tid = 0,
+ .ppid = 1,
+ .ptid = 1,
+ },
+ };
+ struct perf_sample sample = {
+ .time = 50000,
+ };
+
+ /* this is needed to keep dead threads in rbtree */
+ perf_has_index = true;
+
+ /* start_time is set to 0 */
+ t1 = machine__findnew_thread(machine, 0, 0);
+
+ if (verbose > 1) {
+ printf("========= after t1 created ==========\n");
+ machine__for_each_thread(machine, thread__print_cb, NULL);
+ }
+
+ TEST_ASSERT_VAL("wrong start time of old thread", t1->start_time == 0);
+
+ TEST_ASSERT_VAL("cannot find current thread",
+ machine__find_thread(machine, 0, 0) == t1);
+
+ TEST_ASSERT_VAL("cannot find current thread with time",
+ machine__findnew_thread_by_time(machine, 0, 0, 10000) == t1);
+
+ /* start_time is overwritten to new value */
+ thread__set_comm(t1, "/usr/bin/perf", 20000);
+
+ if (verbose > 1) {
+ printf("========= after t1 set comm ==========\n");
+ machine__for_each_thread(machine, thread__print_cb, NULL);
+ }
+
+ TEST_ASSERT_VAL("failed to update start time", t1->start_time == 20000);
+
+ TEST_ASSERT_VAL("should not find passed thread",
+ /* this will create yet another dead thread */
+ machine__findnew_thread_by_time(machine, 0, 0, 10000) != t1);
+
+ TEST_ASSERT_VAL("cannot find overwritten thread with time",
+ machine__find_thread_by_time(machine, 0, 0, 20000) == t1);
+
+ /* now t1 goes to dead thread tree, and create t2 */
+ machine__process_fork_event(machine, &fork_event, &sample);
+
+ if (verbose > 1) {
+ printf("========= after t2 forked ==========\n");
+ machine__for_each_thread(machine, thread__print_cb, NULL);
+ }
+
+ t2 = machine__find_thread(machine, 0, 0);
+
+ TEST_ASSERT_VAL("cannot find current thread", t2 != NULL);
+
+ TEST_ASSERT_VAL("wrong start time of new thread", t2->start_time == 50000);
+
+ TEST_ASSERT_VAL("dead thread cannot be found",
+ machine__find_thread_by_time(machine, 0, 0, 10000) != t1);
+
+ TEST_ASSERT_VAL("cannot find dead thread after new thread",
+ machine__find_thread_by_time(machine, 0, 0, 30000) == t1);
+
+ TEST_ASSERT_VAL("cannot find current thread after new thread",
+ machine__find_thread_by_time(machine, 0, 0, 50000) == t2);
+
+ /* now t2 goes to dead thread tree, and create t3 */
+ sample.time = 60000;
+ machine__process_fork_event(machine, &fork_event, &sample);
+
+ if (verbose > 1) {
+ printf("========= after t3 forked ==========\n");
+ machine__for_each_thread(machine, thread__print_cb, NULL);
+ }
+
+ t3 = machine__find_thread(machine, 0, 0);
+ TEST_ASSERT_VAL("cannot find current thread", t3 != NULL);
+
+ TEST_ASSERT_VAL("wrong start time of new thread", t3->start_time == 60000);
+
+ TEST_ASSERT_VAL("cannot find dead thread after new thread",
+ machine__findnew_thread_by_time(machine, 0, 0, 30000) == t1);
+
+ TEST_ASSERT_VAL("cannot find dead thread after new thread",
+ machine__findnew_thread_by_time(machine, 0, 0, 50000) == t2);
+
+ TEST_ASSERT_VAL("cannot find current thread after new thread",
+ machine__findnew_thread_by_time(machine, 0, 0, 70000) == t3);
+
+ machine__delete_threads(machine);
+ return 0;
+}
+
+static int lookup_without_timestamp(struct machine *machine)
+{
+ struct thread *t1, *t2, *t3;
+ union perf_event fork_event = {
+ .fork = {
+ .pid = 0,
+ .tid = 0,
+ .ppid = 1,
+ .ptid = 1,
+ },
+ };
+ struct perf_sample sample = {
+ .time = -1ULL,
+ };
+
+ t1 = machine__findnew_thread(machine, 0, 0);
+ TEST_ASSERT_VAL("cannot find current thread", t1 != NULL);
+
+ TEST_ASSERT_VAL("cannot find new thread with time",
+ machine__findnew_thread_by_time(machine, 0, 0, -1ULL) == t1);
+
+ machine__process_fork_event(machine, &fork_event, &sample);
+
+ t2 = machine__find_thread(machine, 0, 0);
+ TEST_ASSERT_VAL("cannot find current thread", t2 != NULL);
+
+ TEST_ASSERT_VAL("cannot find new thread with time",
+ machine__find_thread_by_time(machine, 0, 0, -1ULL) == t2);
+
+ machine__process_fork_event(machine, &fork_event, &sample);
+
+ t3 = machine__find_thread(machine, 0, 0);
+ TEST_ASSERT_VAL("cannot find current thread", t3 != NULL);
+
+ TEST_ASSERT_VAL("cannot find new thread with time",
+ machine__findnew_thread_by_time(machine, 0, 0, -1ULL) == t3);
+
+ machine__delete_threads(machine);
+ return 0;
+}
+
+int test__thread_lookup_time(struct test *test __maybe_unused, int subtest __maybe_unused)
+{
+ struct machines machines;
+ struct machine *machine;
+
+ /*
+ * This test is to check whether it can retrieve a correct
+ * thread for a given time. When multi-file data storage is
+ * enabled, those task/comm/mmap events are processed first so
+ * the later sample should find a matching thread properly.
+ */
+ machines__init(&machines);
+ machine = &machines.host;
+
+ if (lookup_with_timestamp(machine) < 0)
+ return -1;
+
+ if (lookup_without_timestamp(machine) < 0)
+ return -1;
+
+ machines__exit(&machines);
+ return 0;
+}
--
2.17.1
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