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Thu, 14 Aug 2025 23:47:34 -0700 (PDT) Received: from 7940hx ([43.129.244.20]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2446d539032sm7161665ad.109.2025.08.14.23.47.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Aug 2025 23:47:33 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: mhiramat@kernel.org, olsajiri@gmail.com Cc: rostedt@goodmis.org, mathieu.desnoyers@efficios.com, hca@linux.ibm.com, revest@chromium.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH bpf-next v4 4/4] selftests/bpf: add benchmark testing for kprobe-multi-all Date: Fri, 15 Aug 2025 14:47:10 +0800 Message-ID: <20250815064712.771089-5-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250815064712.771089-1-dongml2@chinatelecom.cn> References: <20250815064712.771089-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- 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[] =3D { &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/tes= ting/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); } =20 +static void attach_ksyms_all(struct bpf_program *empty, bool kretprobe) +{ + LIBBPF_OPTS(bpf_kprobe_multi_opts, opts); + char **syms =3D NULL; + size_t cnt =3D 0; + + if (bpf_get_ksyms(&syms, &cnt, true)) { + printf("failed to get ksyms\n"); + exit(1); + } + + printf("found %zu ksyms\n", cnt); + opts.syms =3D (const char **) syms; + opts.cnt =3D cnt; + opts.retprobe =3D 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 =3D ctx.skel->progs.bench_kprobe_multi_empty; + prog =3D 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 =3D ctx.skel->progs.bench_kretprobe_multi_empty; + prog =3D 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/tool= s/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=3D( \ 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 \ ) =20 tests=3D("$@") diff --git a/tools/testing/selftests/bpf/progs/trigger_bench.c b/tools/test= ing/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; } =20 +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; } =20 +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/se= lftests/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; =20 + if (!strcmp(name, "bpf_get_numa_node_id")) + return true; + return false; } =20 --=20 2.50.1