From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-170.mta0.migadu.com (out-170.mta0.migadu.com [91.218.175.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C907E35CB9C for ; Wed, 25 Mar 2026 06:45:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.170 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774421145; cv=none; b=fFSw+Cqi0eHMQOWLOzEyQH0PY5lZMwOl/yUaFiCaziNwl9bPQbm2vYIe1uAt9xInYHEqe8wcrsEoKlCsGppj9FLA6Aq7iM4SHlFwlhFOjnlPtP/Cvh/ZzhOIXds2xtX7pXvRtXdbqlKXXiB4RXCmW+wcdS6AV/XL4YP1joM/wV4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774421145; c=relaxed/simple; bh=+H1sQe6hwZTWmRieqS0pXVKir/Imi6FdyST0jsJjmwQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=T3biBYe7ZgBnSIoat2HMrmwsD9mR1ZF1lqKyqdxtR13s9VL080xCaTjcoQKG5JcJLCYG53az2t3+6qEt5ebZzPGYhpMfOzVY6C4MT2TkSA0jESs1qy6D6eaVUymYYKvVc1dlycS6riJzqYOnNEa4USUs0j76YXfIb3lmijqzq1s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=JX187vHh; arc=none smtp.client-ip=91.218.175.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="JX187vHh" Message-ID: <7a119223-9994-4edc-af0b-f1ee9876cd20@linux.dev> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1774421140; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8fJZpIgD+0/f1kEulnsgp/FlRkAUVfsQAT+SXMw8lLE=; b=JX187vHhGYaZXCi2xn6S0mJ0A+dB5YpiINke6nvVz38BVlVPDxKOqSkvvImcT32wZctUNP GWZw+35cAVrhzYGZ3mV+pds8husnoVfak4gG3aZmUBUEUvNq2WEhj2CIPF4mlMv2vL9oss 4lmRYyuFYLllOTjf1Hcy78YBcly4JkU= Date: Wed, 25 Mar 2026 14:45:31 +0800 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [PATCHv4 bpf-next 24/25] selftests/bpf: Add tracing multi attach benchmark test Content-Language: en-US To: Jiri Olsa , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , Menglong Dong , Steven Rostedt References: <20260324081846.2334094-1-jolsa@kernel.org> <20260324081846.2334094-25-jolsa@kernel.org> X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Leon Hwang In-Reply-To: <20260324081846.2334094-25-jolsa@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT On 24/3/26 16:18, Jiri Olsa wrote: > Adding benchmark test that attaches to (almost) all allowed tracing > functions and display attach/detach times. > > # ./test_progs -t tracing_multi_bench_attach -v > bpf_testmod.ko is already unloaded. > Loading bpf_testmod.ko... > Successfully loaded bpf_testmod.ko. > serial_test_tracing_multi_bench_attach:PASS:btf__load_vmlinux_btf 0 nsec > serial_test_tracing_multi_bench_attach:PASS:tracing_multi_bench__open_and_load 0 nsec > serial_test_tracing_multi_bench_attach:PASS:get_syms 0 nsec > serial_test_tracing_multi_bench_attach:PASS:bpf_program__attach_tracing_multi 0 nsec > serial_test_tracing_multi_bench_attach: found 51186 functions > serial_test_tracing_multi_bench_attach: attached in 1.295s > serial_test_tracing_multi_bench_attach: detached in 0.243s > #507 tracing_multi_bench_attach:OK > Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED > Successfully unloaded bpf_testmod.ko. > > Exporting skip_entry as is_unsafe_function and using it in the test. > > Signed-off-by: Jiri Olsa > --- > .../selftests/bpf/prog_tests/tracing_multi.c | 98 +++++++++++++++++++ > .../selftests/bpf/progs/tracing_multi_bench.c | 12 +++ > tools/testing/selftests/bpf/trace_helpers.c | 6 +- > tools/testing/selftests/bpf/trace_helpers.h | 1 + > 4 files changed, 114 insertions(+), 3 deletions(-) > create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_bench.c > > diff --git a/tools/testing/selftests/bpf/prog_tests/tracing_multi.c b/tools/testing/selftests/bpf/prog_tests/tracing_multi.c > index dece45d8fb5e..6917471e329c 100644 > --- a/tools/testing/selftests/bpf/prog_tests/tracing_multi.c > +++ b/tools/testing/selftests/bpf/prog_tests/tracing_multi.c > @@ -9,6 +9,7 @@ > #include "tracing_multi_intersect.skel.h" > #include "tracing_multi_session.skel.h" > #include "tracing_multi_fail.skel.h" > +#include "tracing_multi_bench.skel.h" > #include "trace_helpers.h" > > static __u64 bpf_fentry_test_cookies[] = { > @@ -571,6 +572,103 @@ static void test_attach_api_fails(void) > free(ids2); > } > > +void serial_test_tracing_multi_bench_attach(void) > +{ > + LIBBPF_OPTS(bpf_tracing_multi_opts, opts); > + struct tracing_multi_bench *skel = NULL; > + long attach_start_ns, attach_end_ns; > + long detach_start_ns, detach_end_ns; > + double attach_delta, detach_delta; > + struct bpf_link *link = NULL; > + size_t i, cap = 0, cnt = 0; > + struct ksyms *ksyms = NULL; > + void *root = NULL; > + __u32 *ids = NULL; > + __u32 nr, type_id; > + struct btf *btf; > + int err; > + > +#ifndef __x86_64__ > + test__skip(); > + return; > +#endif > + > + btf = btf__load_vmlinux_btf(); > + if (!ASSERT_OK_PTR(btf, "btf__load_vmlinux_btf")) > + return;> + > + skel = tracing_multi_bench__open_and_load(); > + if (!ASSERT_OK_PTR(skel, "tracing_multi_bench__open_and_load")) > + goto cleanup; > + > + if (!ASSERT_OK(bpf_get_ksyms(&ksyms, true), "get_syms")) > + goto cleanup; > + > + /* Get all ftrace 'safe' symbols.. */ > + for (i = 0; i < ksyms->filtered_cnt; i++) { > + if (is_unsafe_function(ksyms->filtered_syms[i])) > + continue; > + tsearch(&ksyms->filtered_syms[i], &root, compare); > + } > + > + /* ..and filter them through BTF and btf_type_is_traceable_func. */ > + nr = btf__type_cnt(btf); > + for (type_id = 1; type_id < nr; type_id++) { > + const struct btf_type *type; > + const char *str; > + > + type = btf__type_by_id(btf, type_id); > + if (!type) > + break; > + > + if (BTF_INFO_KIND(type->info) != BTF_KIND_FUNC) > + continue; > + > + str = btf__name_by_offset(btf, type->name_off); > + if (!str) > + break; > + > + if (!tfind(&str, &root, compare)) > + continue; > + > + if (!btf_type_is_traceable_func(btf, type)) > + continue; > + > + err = libbpf_ensure_mem((void **) &ids, &cap, sizeof(*ids), cnt + 1); > + if (err) > + goto cleanup; > + > + ids[cnt++] = type_id; > + } > + > + opts.ids = ids; > + opts.cnt = cnt; > + > + attach_start_ns = get_time_ns(); > + link = bpf_program__attach_tracing_multi(skel->progs.bench, NULL, &opts); > + attach_end_ns = get_time_ns(); > + > + if (!ASSERT_OK_PTR(link, "bpf_program__attach_tracing_multi")) > + goto cleanup; > + > + detach_start_ns = get_time_ns(); > + bpf_link__destroy(link); > + 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: found %lu functions\n", __func__, cnt); > + printf("%s: attached in %7.3lfs\n", __func__, attach_delta); > + printf("%s: detached in %7.3lfs\n", __func__, detach_delta); > + > +cleanup: > + tracing_multi_bench__destroy(skel); > + tdestroy(root, tdestroy_free_nop); > + free_kallsyms_local(ksyms); > + free(ids); Is btf__free(btf) missing here? Since 'btf' was calloc inner btf__load_vmlinux_btf(). Thanks, Leon > +} > + > void test_tracing_multi_test(void) > { > #ifndef __x86_64__ > diff --git a/tools/testing/selftests/bpf/progs/tracing_multi_bench.c b/tools/testing/selftests/bpf/progs/tracing_multi_bench.c > new file mode 100644 > index 000000000000..beae946cb8c4 > --- /dev/null > +++ b/tools/testing/selftests/bpf/progs/tracing_multi_bench.c > @@ -0,0 +1,12 @@ > +// SPDX-License-Identifier: GPL-2.0 > +#include > +#include > +#include > + > +char _license[] SEC("license") = "GPL"; > + > +SEC("fentry.multi") > +int BPF_PROG(bench) > +{ > + return 0; > +} > diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c > index 0e63daf83ed5..8de0b60766de 100644 > --- a/tools/testing/selftests/bpf/trace_helpers.c > +++ b/tools/testing/selftests/bpf/trace_helpers.c > @@ -548,7 +548,7 @@ static const char * const trace_blacklist[] = { > "bpf_get_numa_node_id", > }; > > -static bool skip_entry(char *name) > +bool is_unsafe_function(const char *name) > { > int i; > > @@ -651,7 +651,7 @@ int bpf_get_ksyms(struct ksyms **ksymsp, bool kernel) > free(name); > if (sscanf(buf, "%ms$*[^\n]\n", &name) != 1) > continue; > - if (skip_entry(name)) > + if (is_unsafe_function(name)) > continue; > > ks = search_kallsyms_custom_local(ksyms, name, search_kallsyms_compare); > @@ -728,7 +728,7 @@ int bpf_get_addrs(unsigned long **addrsp, size_t *cntp, bool kernel) > free(name); > if (sscanf(buf, "%p %ms$*[^\n]\n", &addr, &name) != 2) > continue; > - if (skip_entry(name)) > + if (is_unsafe_function(name)) > continue; > > if (cnt == max_cnt) { > diff --git a/tools/testing/selftests/bpf/trace_helpers.h b/tools/testing/selftests/bpf/trace_helpers.h > index d5bf1433675d..01c8ecc45627 100644 > --- a/tools/testing/selftests/bpf/trace_helpers.h > +++ b/tools/testing/selftests/bpf/trace_helpers.h > @@ -63,4 +63,5 @@ int read_build_id(const char *path, char *build_id, size_t size); > int bpf_get_ksyms(struct ksyms **ksymsp, bool kernel); > int bpf_get_addrs(unsigned long **addrsp, size_t *cntp, bool kernel); > > +bool is_unsafe_function(const char *name); > #endif