selftests/bpf: add benchmark testing for kprobe-multi-all

For now, the benchmark for kprobe-multi is single, which means there is
only 1 function is hooked during testing. Add the testing
"kprobe-multi-all", which will hook all the kernel functions during
the benchmark.

Signed-off-by: Menglong Dong <[email protected]>

Author: image-dragon

tools/testing/selftests/bpf/bench.c

@@ -510,6 +510,7 @@ 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_kprobe_multi_all;
 extern const struct bench bench_trig_fexit;
 extern const struct bench bench_trig_fmodret;
 extern const struct bench bench_trig_tp;
@@ -578,6 +579,7 @@ static const struct bench *benchs[] = {
 	&bench_trig_kprobe_multi,
 	&bench_trig_kretprobe_multi,
 	&bench_trig_fentry,
+	&bench_trig_kprobe_multi_all,
 	&bench_trig_fexit,
 	&bench_trig_fmodret,
 	&bench_trig_tp,

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

@@ -226,6 +226,35 @@ static void trigger_fentry_setup(void)
 	attach_bpf(ctx.skel->progs.bench_trigger_fentry);
 }
 
+static void trigger_kprobe_multi_all_setup(void)
+{
+	LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);
+	struct bpf_program *prog;
+	struct bpf_link *link;
+	char **syms = NULL;
+	size_t cnt = 0;
+
+	setup_ctx();
+	prog = ctx.skel->progs.bench_trigger_kprobe_multi;
+	bpf_program__set_autoload(prog, true);
+	load_ctx();
+
+	if (bpf_get_ksyms(&syms, &cnt, true)) {
+		printf("failed to get ksyms\n");
+		exit(1);
+	}
+
+	printf("found %zu ksyms\n", cnt);
+	opts.syms = (const char **) syms;
+	opts.cnt = cnt;
+	link = bpf_program__attach_kprobe_multi_opts(prog, NULL, &opts);
+	if (!link) {
+		printf("failed to attach bpf_program__attach_kprobe_multi_opts to all\n");
+		exit(1);
+	}
+	ctx.skel->links.bench_trigger_kprobe_multi = link;
+}
+
 static void trigger_fexit_setup(void)
 {
 	setup_ctx();
@@ -512,6 +541,7 @@ BENCH_TRIG_KERNEL(kretprobe, "kretprobe");
 BENCH_TRIG_KERNEL(kprobe_multi, "kprobe-multi");
 BENCH_TRIG_KERNEL(kretprobe_multi, "kretprobe-multi");
 BENCH_TRIG_KERNEL(fentry, "fentry");
+BENCH_TRIG_KERNEL(kprobe_multi_all, "kprobe-multi-all");
 BENCH_TRIG_KERNEL(fexit, "fexit");
 BENCH_TRIG_KERNEL(fmodret, "fmodret");
 BENCH_TRIG_KERNEL(tp, "tp");

tools/testing/selftests/bpf/benchs/run_bench_trigger.sh

@@ -6,7 +6,7 @@ def_tests=( \
 	usermode-count kernel-count syscall-count \
 	fentry fexit fmodret \
 	rawtp tp \
-	kprobe kprobe-multi \
+	kprobe kprobe-multi kprobe-multi-all \
 	kretprobe kretprobe-multi \
 )