selftests/bpf: Add kprobe multi triggering benchmarks

Adding kprobe multi triggering benchmarks. It's useful now to bench
new fprobe implementation and might be useful later as well.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240311211023.590321-1-jolsa@kernel.org

tools/testing/selftests/bpf/bench.c

@@ -496,6 +496,8 @@ extern const struct bench bench_trig_tp;
 extern const struct bench bench_trig_rawtp;
 extern const struct bench bench_trig_kprobe;
 extern const struct bench bench_trig_kretprobe;
+extern const struct bench bench_trig_kprobe_multi;
+extern const struct bench bench_trig_kretprobe_multi;
 extern const struct bench bench_trig_fentry;
 extern const struct bench bench_trig_fexit;
 extern const struct bench bench_trig_fentry_sleep;
@@ -542,6 +544,8 @@ static const struct bench *benchs[] = {
 	&bench_trig_rawtp,
 	&bench_trig_kprobe,
 	&bench_trig_kretprobe,
+	&bench_trig_kprobe_multi,
+	&bench_trig_kretprobe_multi,
 	&bench_trig_fentry,
 	&bench_trig_fexit,
 	&bench_trig_fentry_sleep,

tools/testing/selftests/bpf/benchs/bench_trigger.c

@@ -91,6 +91,18 @@ static void trigger_kretprobe_setup(void)
 	attach_bpf(ctx.skel->progs.bench_trigger_kretprobe);
 }
 
+static void trigger_kprobe_multi_setup(void)
+{
+	setup_ctx();
+	attach_bpf(ctx.skel->progs.bench_trigger_kprobe_multi);
+}
+
+static void trigger_kretprobe_multi_setup(void)
+{
+	setup_ctx();
+	attach_bpf(ctx.skel->progs.bench_trigger_kretprobe_multi);
+}
+
 static void trigger_fentry_setup(void)
 {
 	setup_ctx();
@@ -283,6 +295,26 @@ const struct bench bench_trig_kretprobe = {
 	.report_final = hits_drops_report_final,
 };
 
+const struct bench bench_trig_kprobe_multi = {
+	.name = "trig-kprobe-multi",
+	.validate = trigger_validate,
+	.setup = trigger_kprobe_multi_setup,
+	.producer_thread = trigger_producer,
+	.measure = trigger_measure,
+	.report_progress = hits_drops_report_progress,
+	.report_final = hits_drops_report_final,
+};
+
+const struct bench bench_trig_kretprobe_multi = {
+	.name = "trig-kretprobe-multi",
+	.validate = trigger_validate,
+	.setup = trigger_kretprobe_multi_setup,
+	.producer_thread = trigger_producer,
+	.measure = trigger_measure,
+	.report_progress = hits_drops_report_progress,
+	.report_final = hits_drops_report_final,
+};
+
 const struct bench bench_trig_fentry = {
 	.name = "trig-fentry",
 	.validate = trigger_validate,

tools/testing/selftests/bpf/progs/trigger_bench.c

@@ -40,6 +40,20 @@ int bench_trigger_kretprobe(void *ctx)
 	return 0;
 }
 
+SEC("kprobe.multi/" SYS_PREFIX "sys_getpgid")
+int bench_trigger_kprobe_multi(void *ctx)
+{
+	__sync_add_and_fetch(&hits, 1);
+	return 0;
+}
+
+SEC("kretprobe.multi/" SYS_PREFIX "sys_getpgid")
+int bench_trigger_kretprobe_multi(void *ctx)
+{
+	__sync_add_and_fetch(&hits, 1);
+	return 0;
+}
+
 SEC("fentry/" SYS_PREFIX "sys_getpgid")
 int bench_trigger_fentry(void *ctx)
 {