[PATCH 09/12] perf test: Add 'brstack' test workload

Namhyung Kim
2022-11-10T18:20:08Z

The brstack is to run different kinds of branches repeatedly. This is
necessary for brstack test case to verify if it has correct branch info.

$ perf test -w brstack

I renamed the internal functions to have brstack_ prefix as it's too
generic name.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/tests/builtin-test.c | 1 +
tools/perf/tests/tests.h | 1 +
tools/perf/tests/workloads/Build | 2 ++
tools/perf/tests/workloads/brstack.c | 39 ++++++++++++++++++++++++++++
4 files changed, 43 insertions(+)
create mode 100644 tools/perf/tests/workloads/brstack.c

diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 9acb7a93eeb9..69fa56939309 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -123,6 +123,7 @@ static struct test_workload *workloads[] = {
&workload__thloop,
&workload__leafloop,
&workload__sqrtloop,
+ &workload__brstack,
};

static int num_subtests(const struct test_suite *t)
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index 18c40319e67c..dc96f59cac2e 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -204,5 +204,6 @@ DECLARE_WORKLOAD(noploop);
DECLARE_WORKLOAD(thloop);
DECLARE_WORKLOAD(leafloop);
DECLARE_WORKLOAD(sqrtloop);
+DECLARE_WORKLOAD(brstack);

#endif /* TESTS_H */
diff --git a/tools/perf/tests/workloads/Build b/tools/perf/tests/workloads/Build
index 1ca95cb0fdb5..c933cdcf91d1 100644
--- a/tools/perf/tests/workloads/Build
+++ b/tools/perf/tests/workloads/Build
@@ -4,5 +4,7 @@ perf-y += noploop.o
perf-y += thloop.o
perf-y += leafloop.o
perf-y += sqrtloop.o
+perf-y += brstack.o

CFLAGS_leafloop.o = -g -O0 -fno-inline -fno-omit-frame-pointer
+CFLAGS_brstack.o = -g -O0 -fno-inline
diff --git a/tools/perf/tests/workloads/brstack.c b/tools/perf/tests/workloads/brstack.c
new file mode 100644
index 000000000000..61c9a9f24b43
--- /dev/null
+++ b/tools/perf/tests/workloads/brstack.c
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <stdlib.h>
+#include "../tests.h"
+
+
+#define BENCH_RUNS 999999
+
+static volatile int cnt;
+
+static void brstack_bar(void) {
+} /* return */
+
+static void brstack_foo(void) {
+ brstack_bar(); /* call */
+} /* return */
+
+static void brstack_bench(void) {
+ void (*brstack_foo_ind)(void) = brstack_foo;
+
+ if ((cnt++) % 3) /* branch (cond) */
+ brstack_foo(); /* call */
+ brstack_bar(); /* call */
+ brstack_foo_ind(); /* call (ind) */
+}
+
+static int brstack(int argc, const char **argv)
+{
+ if (argc > 0)
+ cnt = atoi(argv[0]);
+
+ while (1) {
+ if ((cnt++) > BENCH_RUNS)
+ break;
+ brstack_bench();/* call */
+ } /* branch (uncond) */
+ return 0;
+}
+
+DEFINE_WORKLOAD(brstack);
--
2.38.1.493.g58b659f92b-goog