From e83b9f55448afce3fe1abcd1d10db9584f8042a6 Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Tue, 2 Apr 2019 09:49:50 -0700 Subject: kbuild: add ability to generate BTF type info for vmlinux This patch adds new config option to trigger generation of BTF type information from DWARF debuginfo for vmlinux and kernel modules through pahole, which in turn relies on libbpf for btf_dedup() algorithm. The intent is to record compact type information of all types used inside kernel, including all the structs/unions/typedefs/etc. This enables BPF's compile-once-run-everywhere ([0]) approach, in which tracing programs that are inspecting kernel's internal data (e.g., struct task_struct) can be compiled on a system running some kernel version, but would be possible to run on other kernel versions (and configurations) without recompilation, even if the layout of structs changed and/or some of the fields were added, removed, or renamed. This is only possible if BPF loader can get kernel type info to adjust all the offsets correctly. This patch is a first time in this direction, making sure that BTF type info is part of Linux kernel image in non-loadable ELF section. BTF deduplication ([1]) algorithm typically provides 100x savings compared to DWARF data, so resulting .BTF section is not big as is typically about 2MB in size. [0] http://vger.kernel.org/lpc-bpf2018.html#session-2 [1] https://facebookmicrosites.github.io/bpf/blog/2018/11/14/btf-enhancement.html Cc: Masahiro Yamada Cc: Arnaldo Carvalho de Melo Cc: Daniel Borkmann Cc: Alexei Starovoitov Cc: Yonghong Song Cc: Martin KaFai Lau Signed-off-by: Andrii Nakryiko Acked-by: David S. Miller Acked-by: Alexei Starovoitov Acked-by: Daniel Borkmann Signed-off-by: Daniel Borkmann --- lib/Kconfig.debug | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'lib/Kconfig.debug') diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 0d9e81779e37..188fc17c2202 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -219,6 +219,14 @@ config DEBUG_INFO_DWARF4 But it significantly improves the success of resolving variables in gdb on optimized code. +config DEBUG_INFO_BTF + bool "Generate BTF typeinfo" + depends on DEBUG_INFO + help + Generate deduplicated BTF type information from DWARF debug info. + Turning this on expects presence of pahole tool, which will convert + DWARF type info into equivalent deduplicated BTF type info. + config GDB_SCRIPTS bool "Provide GDB scripts for kernel debugging" depends on DEBUG_INFO -- cgit v1.2.3