From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 3D8A3365A08; Tue, 24 Mar 2026 08:18:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774340340; cv=none; b=rkUHgr6T9ILAXdFzb9OwlRX0Nb7jwZxY2/das1v0WSqXBq4PNatuZ3EyPfNRg/+8xpy9tMBrRQLXMxAvASbEWfWyE7PVQRFtxcqWN7cwv+Cf41QLFsMwyE8GA8PyInT1pRLZF5q4gy5/jwa5wvqM98jrUnRt86cDUras1+mVXaM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774340340; c=relaxed/simple; bh=ZP1fqAasDk3GX97kzqOf84Tgy/Nd3Ugu5ZUEar1SkB8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=AWaUXNFsp0BzmU9IIjwTvzWzBOLhKiYH9kYpr+q37NHM57UODiZ5tsXxLR8czE0EcagBFYD8//enyfAtLTJ9PM3ATqA3iMQHTVYr983TYrEPI6L6urUAEIHY35VC/fFU0DLWQeM5XMtkCly2zM62+nf85/eai26m6OK4Xo6nyC0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NUAZgRIe; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="NUAZgRIe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6AE4C2BC9E; Tue, 24 Mar 2026 08:18:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774340339; bh=ZP1fqAasDk3GX97kzqOf84Tgy/Nd3Ugu5ZUEar1SkB8=; h=From:To:Cc:Subject:Date:From; b=NUAZgRIedZ6JEMvehozelPs3VuITBFCTkDJl1XDe/GWkeY+SdtAP6d8DTiVSRNfj4 s9wLcUQ6mLx6loXNeDZkKAVWdIqnmuNJ91VypTgG88Z3KBaCgZiyRbU8P2nGZGBifD jGcBPMaqRSAQQTBkTWkMM/dobi7/UWx6vzJyf56sx0XHbgzoWEZaN6ElL8aJfaXZkS i0Xv+eHz1lewUEFYkCwqh0To8CyNwrSE8ONyOPNcB0HnW+wuFwR4MCtd6zKbi0bmU8 7RwKLnalgVzftvYaKNUhO3LylWYXLmNzgpOmMBrB+xNXu4xEkwfF7IfMWyyvETmt4H 9ZMWzBXNSaywg== From: Jiri Olsa To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: Hengqi Chen , bpf@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , Menglong Dong , Steven Rostedt Subject: [PATCHv4 bpf-next 00/25] bpf: tracing_multi link Date: Tue, 24 Mar 2026 09:18:21 +0100 Message-ID: <20260324081846.2334094-1-jolsa@kernel.org> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit hi, adding tracing_multi link support that allows fast attachment of tracing program to many functions. RFC: https://lore.kernel.org/bpf/20260203093819.2105105-1-jolsa@kernel.org/ v1: https://lore.kernel.org/bpf/20260220100649.628307-1-jolsa@kernel.org/ v2: https://lore.kernel.org/bpf/20260304222141.497203-1-jolsa@kernel.org/ v3: https://lore.kernel.org/bpf/20260316075138.465430-1-jolsa@kernel.org/ v4 changes: - unlink rollback fix (added ftrace_hash_count) [bot] - use const for some bpf_link_create_opts tracing_multi members [bot] - adding missing comment for lockdep keys [bot] - selftest error path fixes (leaks) and other assorted test fixes [Leon Hwang] - several compile fixes wrt CONFIG_BPF_SYSCALL and CONFIG_BPF_JIT [kernel test robot] - make ftrace_hash_clear global, because it's needed in rollback v3 changes: - fix module parsing [Leon Hwang] - use function traceable check from libbpf [Leon Hwang] - use ptr_to_u64 and fix/updated few comments [ci] - display cookies as decimal numbers [ci] - added link_create.flags check [ci] - fix error path in bpf_trampoline_multi_detach [ci] - make fentry/fexit.multi not extendable [ci] - add missing OPTS_VALID to bpf_program__attach_tracing_multi [ci] v2 changes: - allocate data.unreg in bpf_trampoline_multi_attach for rollback path [ci] and fixed link count setup in rollback path [ci] - several small assorted fixes [ci] - added loongarch and powerpc changes for struct bpf_tramp_node change - added support to attach functions from modules - added tests for sleepable programs - added rollback tests v1 changes: - added ftrace_hash_count as wrapper for hash_count [Steven] - added trampoline mutex pool [Andrii] - reworked 'struct bpf_tramp_node' separatoin [Andrii] - the 'struct bpf_tramp_node' now holds pointer to bpf_link, which is similar to what we do for uprobe_multi; I understand it's not a fundamental change compared to previous version which used bpf_prog pointer instead, but I don't see better way of doing this.. I'm happy to discuss this further if there's better idea - reworked 'struct bpf_fsession_link' based on bpf_tramp_node - made btf__find_by_glob_kind function internal helper [Andrii] - many small assorted fixes [Andrii,CI] - added session support [Leon Hwang] - added cookies support - added more tests Note I plan to send linkinfo support separately, the patchset is big enough. thanks, jirka Cc: Hengqi Chen --- Jiri Olsa (25): ftrace: Add ftrace_hash_count function ftrace: Make ftrace_hash_clear global bpf: Use mutex lock pool for bpf trampolines bpf: Add struct bpf_trampoline_ops object bpf: Add struct bpf_tramp_node object bpf: Factor fsession link to use struct bpf_tramp_node bpf: Add multi tracing attach types bpf: Move sleepable verification code to btf_id_allow_sleepable bpf: Add bpf_trampoline_multi_attach/detach functions bpf: Add support for tracing multi link bpf: Add support for tracing_multi link cookies bpf: Add support for tracing_multi link session bpf: Add support for tracing_multi link fdinfo libbpf: Add bpf_object_cleanup_btf function libbpf: Add bpf_link_create support for tracing_multi link libbpf: Add btf_type_is_traceable_func function libbpf: Add support to create tracing multi link selftests/bpf: Add tracing multi skel/pattern/ids attach tests selftests/bpf: Add tracing multi skel/pattern/ids module attach tests selftests/bpf: Add tracing multi intersect tests selftests/bpf: Add tracing multi cookies test selftests/bpf: Add tracing multi session test selftests/bpf: Add tracing multi attach fails test selftests/bpf: Add tracing multi attach benchmark test selftests/bpf: Add tracing multi attach rollback tests arch/arm64/net/bpf_jit_comp.c | 58 +++--- arch/loongarch/net/bpf_jit.c | 44 ++--- arch/powerpc/net/bpf_jit_comp.c | 46 ++--- arch/riscv/net/bpf_jit_comp64.c | 52 ++--- arch/s390/net/bpf_jit_comp.c | 44 ++--- arch/x86/net/bpf_jit_comp.c | 54 ++--- include/linux/bpf.h | 102 +++++++--- include/linux/bpf_types.h | 1 + include/linux/bpf_verifier.h | 3 + include/linux/btf_ids.h | 1 + include/linux/ftrace.h | 2 + include/linux/trace_events.h | 6 + include/uapi/linux/bpf.h | 9 + kernel/bpf/bpf_struct_ops.c | 27 +-- kernel/bpf/btf.c | 4 + kernel/bpf/syscall.c | 88 ++++++--- kernel/bpf/trampoline.c | 536 ++++++++++++++++++++++++++++++++++++++++--------- kernel/bpf/verifier.c | 124 +++++++++--- kernel/trace/bpf_trace.c | 149 +++++++++++++- kernel/trace/ftrace.c | 9 +- net/bpf/bpf_dummy_struct_ops.c | 14 +- net/bpf/test_run.c | 3 + tools/include/uapi/linux/bpf.h | 10 + tools/lib/bpf/bpf.c | 9 + tools/lib/bpf/bpf.h | 5 + tools/lib/bpf/libbpf.c | 337 ++++++++++++++++++++++++++++++- tools/lib/bpf/libbpf.h | 15 ++ tools/lib/bpf/libbpf.map | 1 + tools/lib/bpf/libbpf_internal.h | 1 + tools/testing/selftests/bpf/Makefile | 9 +- tools/testing/selftests/bpf/prog_tests/tracing_multi.c | 912 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/testing/selftests/bpf/progs/tracing_multi_attach.c | 39 ++++ tools/testing/selftests/bpf/progs/tracing_multi_attach_module.c | 25 +++ tools/testing/selftests/bpf/progs/tracing_multi_bench.c | 12 ++ tools/testing/selftests/bpf/progs/tracing_multi_check.c | 212 ++++++++++++++++++++ tools/testing/selftests/bpf/progs/tracing_multi_fail.c | 18 ++ tools/testing/selftests/bpf/progs/tracing_multi_intersect_attach.c | 41 ++++ tools/testing/selftests/bpf/progs/tracing_multi_rollback.c | 43 ++++ tools/testing/selftests/bpf/progs/tracing_multi_session_attach.c | 43 ++++ tools/testing/selftests/bpf/trace_helpers.c | 6 +- tools/testing/selftests/bpf/trace_helpers.h | 1 + 41 files changed, 2749 insertions(+), 366 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/tracing_multi.c create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_attach.c create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_attach_module.c create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_bench.c create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_check.c create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_fail.c create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_intersect_attach.c create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_rollback.c create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_session_attach.c