[PATCH 05/12] perf test: Add 'leafloop' test workload

Namhyung Kim
2022-11-10T18:19:47Z

The leafloop workload is to run an infinite loop in the test_leaf
function. This is needed for the ARM fp callgraph test to verify if it
gets the correct callchains.

$ perf test -w leafloop

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 | 3 +++
tools/perf/tests/workloads/leafloop.c | 34 +++++++++++++++++++++++++++
4 files changed, 39 insertions(+)
create mode 100644 tools/perf/tests/workloads/leafloop.c

diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 161f38476e77..0ed5ac452f6e 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -121,6 +121,7 @@ static struct test_suite **tests[] = {
static struct test_workload *workloads[] = {
&workload__noploop,
&workload__thloop,
+ &workload__leafloop,
};

static int num_subtests(const struct test_suite *t)
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index e6edfeeadaeb..86804dd6452b 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -202,5 +202,6 @@ struct test_workload workload__##work = { \
/* The list of test workloads */
DECLARE_WORKLOAD(noploop);
DECLARE_WORKLOAD(thloop);
+DECLARE_WORKLOAD(leafloop);

#endif /* TESTS_H */
diff --git a/tools/perf/tests/workloads/Build b/tools/perf/tests/workloads/Build
index b8964b1099c0..631596bdb2b3 100644
--- a/tools/perf/tests/workloads/Build
+++ b/tools/perf/tests/workloads/Build
@@ -2,3 +2,6 @@

perf-y += noploop.o
perf-y += thloop.o
+perf-y += leafloop.o
+
+CFLAGS_leafloop.o = -g -O0 -fno-inline -fno-omit-frame-pointer
diff --git a/tools/perf/tests/workloads/leafloop.c b/tools/perf/tests/workloads/leafloop.c
new file mode 100644
index 000000000000..1bf5cc97649b
--- /dev/null
+++ b/tools/perf/tests/workloads/leafloop.c
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <stdlib.h>
+#include <linux/compiler.h>
+#include "../tests.h"
+
+/* We want to check these symbols in perf script */
+noinline void leaf(volatile int b);
+noinline void parent(volatile int b);
+
+static volatile int a;
+
+noinline void leaf(volatile int b)
+{
+ for (;;)
+ a += b;
+}
+
+noinline void parent(volatile int b)
+{
+ leaf(b);
+}
+
+static int leafloop(int argc, const char **argv)
+{
+ int c = 1;
+
+ if (argc > 0)
+ c = atoi(argv[0]);
+
+ parent(c);
+ return 0;
+}
+
+DEFINE_WORKLOAD(leafloop);
--
2.38.1.493.g58b659f92b-goog