[PATCH 11/12] perf test: Add 'datasym' test workload

Namhyung Kim
2022-11-10T18:20:21Z

The datasym workload is to check if perf mem command gets the data
addresses precisely. This is needed for data symbol test.

$ perf test -w datasym

I had to keep the buf1 in the data section, otherwise it could end
up in the BSS and was mmaped as a separate //anon region, then it
was not symbolized at all. It needs to be fixed separately.

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/datasym.c | 24 ++++++++++++++++++++++++
4 files changed, 28 insertions(+)
create mode 100644 tools/perf/tests/workloads/datasym.c

diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 69fa56939309..4c6ae59a4dfd 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -124,6 +124,7 @@ static struct test_workload *workloads[] = {
&workload__leafloop,
&workload__sqrtloop,
&workload__brstack,
+ &workload__datasym,
};

static int num_subtests(const struct test_suite *t)
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index dc96f59cac2e..e15f24cfc909 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -205,5 +205,6 @@ DECLARE_WORKLOAD(thloop);
DECLARE_WORKLOAD(leafloop);
DECLARE_WORKLOAD(sqrtloop);
DECLARE_WORKLOAD(brstack);
+DECLARE_WORKLOAD(datasym);

#endif /* TESTS_H */
diff --git a/tools/perf/tests/workloads/Build b/tools/perf/tests/workloads/Build
index c933cdcf91d1..ec3cb10c52ae 100644
--- a/tools/perf/tests/workloads/Build
+++ b/tools/perf/tests/workloads/Build
@@ -5,6 +5,8 @@ perf-y += thloop.o
perf-y += leafloop.o
perf-y += sqrtloop.o
perf-y += brstack.o
+perf-y += datasym.o

CFLAGS_leafloop.o = -g -O0 -fno-inline -fno-omit-frame-pointer
CFLAGS_brstack.o = -g -O0 -fno-inline
+CFLAGS_datasym.o = -g -O0 -fno-inline
diff --git a/tools/perf/tests/workloads/datasym.c b/tools/perf/tests/workloads/datasym.c
new file mode 100644
index 000000000000..ddd40bc63448
--- /dev/null
+++ b/tools/perf/tests/workloads/datasym.c
@@ -0,0 +1,24 @@
+#include <linux/compiler.h>
+#include "../tests.h"
+
+typedef struct _buf {
+ char data1;
+ char reserved[55];
+ char data2;
+} buf __attribute__((aligned(64)));
+
+static buf buf1 = {
+ /* to have this in the data section */
+ .reserved[0] = 1,
+};
+
+static int datasym(int argc __maybe_unused, const char **argv __maybe_unused)
+{
+ for (;;) {
+ buf1.data1++;
+ buf1.data2 += buf1.data1;
+ }
+ return 0;
+}
+
+DEFINE_WORKLOAD(datasym);
--
2.38.1.493.g58b659f92b-goog