[PATCHv5 bpf-next 23/28] selftests/bpf: Add uprobe_multi bench test

Jiri Olsa
2023-07-30T13:46:19Z

Adding test that attaches 50k uprobes in uprobe_multi binary.

After the attach is done we run the binary and make sure we
get proper amount of hits.

The resulting attach/detach times on my setup:

test_bench_attach_uprobe:PASS:uprobe_multi__open 0 nsec
test_bench_attach_uprobe:PASS:uprobe_multi__attach 0 nsec
test_bench_attach_uprobe:PASS:uprobes_count 0 nsec
test_bench_attach_uprobe: attached in 0.346s
test_bench_attach_uprobe: detached in 0.419s
#262/5 uprobe_multi_test/bench_uprobe:OK

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
.../bpf/prog_tests/uprobe_multi_test.c | 40 +++++++++++++++++++
.../selftests/bpf/progs/uprobe_multi_bench.c | 15 +++++++
2 files changed, 55 insertions(+)
create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_bench.c

diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
index e460fd4d370d..56c2062af1c9 100644
--- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
@@ -3,7 +3,9 @@
#include <unistd.h>
#include <test_progs.h>
#include "uprobe_multi.skel.h"
+#include "uprobe_multi_bench.skel.h"
#include "bpf/libbpf_internal.h"
+#include "testing_helpers.h"

static char test_data[] = "test_data";

@@ -196,6 +198,42 @@ static void test_link_api(void)
free(offsets);
}

+static void test_bench_attach_uprobe(void)
+{
+ long attach_start_ns, attach_end_ns = 0;
+ struct uprobe_multi_bench *skel = NULL;
+ long detach_start_ns, detach_end_ns;
+ double attach_delta, detach_delta;
+ int err;
+
+ skel = uprobe_multi_bench__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "uprobe_multi__open"))
+ goto cleanup;
+
+ attach_start_ns = get_time_ns();
+
+ err = uprobe_multi_bench__attach(skel);
+ if (!ASSERT_OK(err, "uprobe_multi__attach"))
+ goto cleanup;
+
+ attach_end_ns = get_time_ns();
+
+ system("./uprobe_multi bench");
+
+ ASSERT_EQ(skel->bss->count, 50000, "uprobes_count");
+
+cleanup:
+ detach_start_ns = get_time_ns();
+ uprobe_multi_bench__destroy(skel);
+ detach_end_ns = get_time_ns();
+
+ attach_delta = (attach_end_ns - attach_start_ns) / 1000000000.0;
+ detach_delta = (detach_end_ns - detach_start_ns) / 1000000000.0;
+
+ printf("%s: attached in %7.3lfs\n", __func__, attach_delta);
+ printf("%s: detached in %7.3lfs\n", __func__, detach_delta);
+}
+
void test_uprobe_multi_test(void)
{
if (test__start_subtest("skel_api"))
@@ -206,4 +244,6 @@ void test_uprobe_multi_test(void)
test_attach_api_syms();
if (test__start_subtest("link_api"))
test_link_api();
+ if (test__start_subtest("bench_uprobe"))
+ test_bench_attach_uprobe();
}
diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi_bench.c b/tools/testing/selftests/bpf/progs/uprobe_multi_bench.c
new file mode 100644
index 000000000000..5367f6105e30
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/uprobe_multi_bench.c
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+int count;
+
+SEC("uprobe.multi/./uprobe_multi:uprobe_multi_func_*")
+int uprobe_bench(struct pt_regs *ctx)
+{
+ count++;
+ return 0;
+}
--
2.41.0