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Message-ID: <20250731092433.49367-5-dongml2@chinatelecom.cn>
Date: Thu, 31 Jul 2025 17:24:27 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: mhiramat@...nel.org,
olsajiri@...il.com
Cc: rostedt@...dmis.org,
mathieu.desnoyers@...icios.com,
hca@...ux.ibm.com,
revest@...omium.org,
linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org,
bpf@...r.kernel.org
Subject: [PATCH bpf-next v3 4/4] 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. And the "kretprobe-multi-all" is added too.
Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>
---
v3:
- add testcase kretprobe-multi-all
- attach a empty kprobe-multi/kretprobe-multi prog to all the kernel
functions except bpf_get_numa_node_id to make the bench result more
accurate
---
tools/testing/selftests/bpf/bench.c | 4 ++
.../selftests/bpf/benchs/bench_trigger.c | 54 +++++++++++++++++++
.../selftests/bpf/benchs/run_bench_trigger.sh | 4 +-
.../selftests/bpf/progs/trigger_bench.c | 12 +++++
tools/testing/selftests/bpf/trace_helpers.c | 3 ++
5 files changed, 75 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/bpf/bench.c b/tools/testing/selftests/bpf/bench.c
index ddd73d06a1eb..29dbf937818a 100644
--- a/tools/testing/selftests/bpf/bench.c
+++ b/tools/testing/selftests/bpf/bench.c
@@ -510,6 +510,8 @@ 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_kretprobe_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 +580,8 @@ static const struct bench *benchs[] = {
&bench_trig_kprobe_multi,
&bench_trig_kretprobe_multi,
&bench_trig_fentry,
+ &bench_trig_kprobe_multi_all,
+ &bench_trig_kretprobe_multi_all,
&bench_trig_fexit,
&bench_trig_fmodret,
&bench_trig_tp,
diff --git a/tools/testing/selftests/bpf/benchs/bench_trigger.c b/tools/testing/selftests/bpf/benchs/bench_trigger.c
index 82327657846e..c6634a64a7c0 100644
--- a/tools/testing/selftests/bpf/benchs/bench_trigger.c
+++ b/tools/testing/selftests/bpf/benchs/bench_trigger.c
@@ -226,6 +226,58 @@ static void trigger_fentry_setup(void)
attach_bpf(ctx.skel->progs.bench_trigger_fentry);
}
+static void attach_ksyms_all(struct bpf_program *empty, bool kretprobe)
+{
+ LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);
+ char **syms = NULL;
+ size_t cnt = 0;
+
+ 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;
+ opts.retprobe = kretprobe;
+ /* attach empty to all the kernel functions except bpf_get_numa_node_id. */
+ if (!bpf_program__attach_kprobe_multi_opts(empty, NULL, &opts)) {
+ printf("failed to attach bpf_program__attach_kprobe_multi_opts to all\n");
+ exit(1);
+ }
+}
+
+static void trigger_kprobe_multi_all_setup(void)
+{
+ struct bpf_program *prog, *empty;
+
+ setup_ctx();
+ empty = ctx.skel->progs.bench_kprobe_multi_empty;
+ prog = ctx.skel->progs.bench_trigger_kprobe_multi;
+ bpf_program__set_autoload(empty, true);
+ bpf_program__set_autoload(prog, true);
+ load_ctx();
+
+ attach_ksyms_all(empty, false);
+ attach_bpf(prog);
+}
+
+static void trigger_kretprobe_multi_all_setup(void)
+{
+ struct bpf_program *prog, *empty;
+
+ setup_ctx();
+ empty = ctx.skel->progs.bench_kretprobe_multi_empty;
+ prog = ctx.skel->progs.bench_trigger_kretprobe_multi;
+ bpf_program__set_autoload(empty, true);
+ bpf_program__set_autoload(prog, true);
+ load_ctx();
+
+ attach_ksyms_all(empty, true);
+ attach_bpf(prog);
+}
+
static void trigger_fexit_setup(void)
{
setup_ctx();
@@ -512,6 +564,8 @@ 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(kretprobe_multi_all, "kretprobe-multi-all");
BENCH_TRIG_KERNEL(fexit, "fexit");
BENCH_TRIG_KERNEL(fmodret, "fmodret");
BENCH_TRIG_KERNEL(tp, "tp");
diff --git a/tools/testing/selftests/bpf/benchs/run_bench_trigger.sh b/tools/testing/selftests/bpf/benchs/run_bench_trigger.sh
index a690f5a68b6b..f7573708a0c3 100755
--- a/tools/testing/selftests/bpf/benchs/run_bench_trigger.sh
+++ b/tools/testing/selftests/bpf/benchs/run_bench_trigger.sh
@@ -6,8 +6,8 @@ def_tests=( \
usermode-count kernel-count syscall-count \
fentry fexit fmodret \
rawtp tp \
- kprobe kprobe-multi \
- kretprobe kretprobe-multi \
+ kprobe kprobe-multi kprobe-multi-all \
+ kretprobe kretprobe-multi kretprobe-multi-all \
)
tests=("$@")
diff --git a/tools/testing/selftests/bpf/progs/trigger_bench.c b/tools/testing/selftests/bpf/progs/trigger_bench.c
index 044a6d78923e..3d5f30c29ae3 100644
--- a/tools/testing/selftests/bpf/progs/trigger_bench.c
+++ b/tools/testing/selftests/bpf/progs/trigger_bench.c
@@ -97,6 +97,12 @@ int bench_trigger_kprobe_multi(void *ctx)
return 0;
}
+SEC("?kprobe.multi/bpf_get_numa_node_id")
+int bench_kprobe_multi_empty(void *ctx)
+{
+ return 0;
+}
+
SEC("?kretprobe.multi/bpf_get_numa_node_id")
int bench_trigger_kretprobe_multi(void *ctx)
{
@@ -104,6 +110,12 @@ int bench_trigger_kretprobe_multi(void *ctx)
return 0;
}
+SEC("?kretprobe.multi/bpf_get_numa_node_id")
+int bench_kretprobe_multi_empty(void *ctx)
+{
+ return 0;
+}
+
SEC("?fentry/bpf_get_numa_node_id")
int bench_trigger_fentry(void *ctx)
{
diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c
index 9da9da51b132..78cf1aab09d8 100644
--- a/tools/testing/selftests/bpf/trace_helpers.c
+++ b/tools/testing/selftests/bpf/trace_helpers.c
@@ -575,6 +575,9 @@ static bool skip_entry(char *name)
if (!strcmp(name, "__rcu_read_unlock"))
return true;
+ if (!strcmp(name, "bpf_get_numa_node_id"))
+ return true;
+
return false;
}
--
2.50.1
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