Em Thu, Nov 11, 2021 at 10:34:33PM -0800, Ian Rogers escreveu: > Hi, > Debian currently tries to match the Linux perf tool to the version of > the kernel that it is being run upon. Reaching out to Ben Hutchings, > he explained to me that this was done back in 2010 due to kernel and > Linux perf incompatibilities. This was likely the case, but it was a > bug in the Linux perf tool that should have been fixed. It is the goal > of the tool to be backward compatible. A problem with matching the > tool to the kernel version is that users miss out on new features and > fixes (this topic came up in a recent interview of the maintainer > Arnaldo Carvalho de Melo [1]). > Ben Hutchings informs me that making it so that Debian ships the > latest Linux perf tool requires updates both to the linux-base and > linux source packages. The Linux perf tool also has many other often > optional dependencies, like libunwind, libbpf, libpfm4, libtraceevent, > etc. In general, having the dependency will unlock more features. > Linux tools has its own copies of libbpf and libtraceevent, and so > these may pose some versioning issues.
We can use LIBBPF_DYNAMIC=1 to use the distro libbpf-dev package, which currently is going thru some growing pains as libbpf is 0.x, with several APIs being deprecated, others renamed, and that has been a source of friction, but should be past us with v1.0. Till then the perf codebase is being adjusted to allow it to be seamlessly built with the in-kernel version and with whatever libbpf-devel the distro has. > I think it'd be great to get Debian shipping the latest version of > Linux perf for its users. Hopefully we can agree to change how Debian > packages perf currently and then work out the best way to package and > keep it up-to-date. I look forward to everyone's help and input. I also keep the tarballs available at: https://mirrors.edge.kernel.org/pub/linux/kernel/tools/perf/ Where there are instructions on how to build this detached tarball. I regularly build perf on lots of distros, including: debian:9 : Ok gcc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516 , clang version 3.8.1-24 (tags/RELEASE_381/final) debian:10 : Ok gcc (Debian 8.3.0-6) 8.3.0 , clang version 7.0.1-8+deb10u2 (tags/RELEASE_701/final) debian:11 : Ok gcc (Debian 10.2.1-6) 10.2.1 20210110 , Debian clang version 11.0.1-2 debian:experimental : Ok gcc (Debian 11.2.0-10) 11.2.0 , Debian clang version 11.1.0-4 debian:experimental-x-arm64 : Ok aarch64-linux-gnu-gcc (Debian 11.2.0-9) 11.2.0 debian:experimental-x-mips : Ok mips-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 20210110 debian:experimental-x-mips64 : Ok mips64-linux-gnuabi64-gcc (Debian 10.2.1-6) 10.2.1 20210110 debian:experimental-x-mipsel : Ok mipsel-linux-gnu-gcc (Debian 11.2.0-9) 11.2.0 Ditto for ubuntu. A complete list can be found in each pull request I send to Linus, see in the last one: https://lore.kernel.org/all/20211107204947.1394255-1-a...@kernel.org/ Search for BUILD_TARBALL. There is also the output for 'make -C tools/perf build-test' that tests building with lots of combinations of optional libraries, for instance, with LIBBPF_DYNAMIC=1, etc. - Arnaldo
