[PATCHv5 bpf-next 25/28] selftests/bpf: Add uprobe_multi usdt bench test

Jiri Olsa
2023-07-30T13:46:39Z

Adding test that attaches 50k usdt probes in usdt_multi binary.

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

With current uprobes:

# perf stat --null ./test_progs -n 254/6
#254/6 uprobe_multi_test/bench_usdt:OK
#254 uprobe_multi_test:OK
Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED

Performance counter stats for './test_progs -n 254/6':

1353.659680562 seconds time elapsed

With uprobe_multi link:

# perf stat --null ./test_progs -n 254/6
#254/6 uprobe_multi_test/bench_usdt:OK
#254 uprobe_multi_test:OK
Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED

Performance counter stats for './test_progs -n 254/6':

0.322046364 seconds time elapsed

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
.../bpf/prog_tests/uprobe_multi_test.c | 39 +++++++++++++++++++
.../selftests/bpf/progs/uprobe_multi_usdt.c | 16 ++++++++
2 files changed, 55 insertions(+)
create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_usdt.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 56c2062af1c9..19a66431a61f 100644
--- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
@@ -4,6 +4,7 @@
#include <test_progs.h>
#include "uprobe_multi.skel.h"
#include "uprobe_multi_bench.skel.h"
+#include "uprobe_multi_usdt.skel.h"
#include "bpf/libbpf_internal.h"
#include "testing_helpers.h"

@@ -234,6 +235,42 @@ static void test_bench_attach_uprobe(void)
printf("%s: detached in %7.3lfs\n", __func__, detach_delta);
}

+static void test_bench_attach_usdt(void)
+{
+ struct uprobe_multi_usdt *skel = NULL;
+ long attach_start_ns, attach_end_ns;
+ long detach_start_ns, detach_end_ns;
+ double attach_delta, detach_delta;
+
+ skel = uprobe_multi_usdt__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "uprobe_multi__open"))
+ goto cleanup;
+
+ attach_start_ns = get_time_ns();
+
+ skel->links.usdt0 = bpf_program__attach_usdt(skel->progs.usdt0, -1, "./uprobe_multi",
+ "test", "usdt", NULL);
+ if (!ASSERT_OK_PTR(skel->links.usdt0, "bpf_program__attach_usdt"))
+ goto cleanup;
+
+ attach_end_ns = get_time_ns();
+
+ system("./uprobe_multi usdt");
+
+ ASSERT_EQ(skel->bss->count, 50000, "usdt_count");
+
+cleanup:
+ detach_start_ns = get_time_ns();
+ uprobe_multi_usdt__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"))
@@ -246,4 +283,6 @@ void test_uprobe_multi_test(void)
test_link_api();
if (test__start_subtest("bench_uprobe"))
test_bench_attach_uprobe();
+ if (test__start_subtest("bench_usdt"))
+ test_bench_attach_usdt();
}
diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi_usdt.c b/tools/testing/selftests/bpf/progs/uprobe_multi_usdt.c
new file mode 100644
index 000000000000..9e1c33d0bd2f
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/uprobe_multi_usdt.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/usdt.bpf.h>
+
+char _license[] SEC("license") = "GPL";
+
+int count;
+
+SEC("usdt")
+int usdt0(struct pt_regs *ctx)
+{
+ count++;
+ return 0;
+}
--
2.41.0