Re: [PATCH v2 0/3] Assume libbpf 1.0+

[Ian Rogers]

On Thu, Jan 19, 2023 at 1:13 PM Jiri Olsa <olsajiri@xxxxxxxxx> wrote:
>
> On Thu, Jan 19, 2023 at 02:41:12PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Thu, Jan 19, 2023 at 09:11:03AM -0800, Ian Rogers escreveu:
> > > On Sun, Jan 15, 2023 at 5:01 PM Ian Rogers <irogers@xxxxxxxxxx> wrote:
> > > > libbpf 1.0 was a major change in API. Perf has partially supported
> > > > older libbpf's but an implementation may be:
> > > > ..
> > > >        pr_err("%s: not support, update libbpf\n", __func__);
> > > >        return -ENOTSUP;
> > > > ..
> > > >
> > > > Rather than build a binary that would fail at runtime it is
> > > > preferrential just to build libbpf statically and link against
> > > > that. The static version is in the kernel tools tree and newer than
> > > > 1.0.
> > > >
> > > > These patches change the libbpf test to only pass when at least
> > > > version 1.0 is installed, then remove the conditional build and
> > > > feature logic.
> > > >
> > > > The issue is discussed here:
> > > > https://lore.kernel.org/lkml/20230106151320.619514-1-irogers@xxxxxxxxxx/
> > > > perf bpf:
> > > >
> > > > A variant of this fix was added to Linux 6.2 in:
> > > > "perf bpf: Avoid build breakage with libbpf < 0.8.0 + LIBBPF_DYNAMIC=1"
> > > > https://lore.kernel.org/lkml/Y71+eh00Ju7WeEFX@xxxxxxxxxx/
> > > > This change goes further in removing logic that is now no longer
> > > > necessary.
> > > >
> > > > v2. Rebase now that breakage fix patch is in linus/master.
> > >
> > > I missed the:
> > > Acked/Tested-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> > > I believe we are waiting for package maintainer input.
> >
> > Yes, as fedora:37 still is at libbpf 0.8.0 :-\
>
> rawhide (f38) is already on 1.1.0 ... I'll check how bad it'd be to move
> f37 to 1.x, but I had to do bulk update of like 10 other dependent packages
> for f38, so not sure how bad it'd be for f37
>
> jirka

+Guilherme

We were looking for maintainer input on these changes, but there is no
update in over a month. Here is the original lore link:
https://lore.kernel.org/lkml/CAP-5=fVUgc8xtBzGi66YRUxZHyXvW2kiMjGz39dywaLxrO4Hpg@xxxxxxxxxxxxxx/
Should these changes land in perf-tools-next targeting Linux 6.4?

Thanks,
Ian

> >
> > This is what I have in the containers I test, sure, the older ones
> > already have NO_LIBBPF=1 and some will get this added, and some I still
> > need to ask for libbpf-devel (or the distro specific name, like
> > libbpf-dev):
> >
> > [perfbuilder@five ~]$ podman images --format "{{.Repository}}:{{.Tag}}" | grep /acmel/ | grep -v '<none>' | sort -t: -Vk1,2 | grep -v -- -x- | while read image ; do echo -n $image: ; libbpf=$(podman run --rm -t --entrypoint=ls $image -la /usr/lib64/libbpf.so.1) ; echo $libbpf ; done
> > localhost/acmel/linux-perf-tools-build-almalinux:8:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-almalinux:9:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-alpine:3.12:ls: /usr/lib64/libbpf.so.1: No such file or directory
> > localhost/acmel/linux-perf-tools-build-alpine:3.13:ls: /usr/lib64/libbpf.so.1: No such file or directory
> > localhost/acmel/linux-perf-tools-build-alpine:3.14:ls: /usr/lib64/libbpf.so.1: No such file or directory
> > localhost/acmel/linux-perf-tools-build-alpine:3.15:ls: /usr/lib64/libbpf.so.1: No such file or directory
> > localhost/acmel/linux-perf-tools-build-alpine:3.16:ls: /usr/lib64/libbpf.so.1: No such file or directory
> > localhost/acmel/linux-perf-tools-build-alpine:3.17:ls: /usr/lib64/libbpf.so.1: No such file or directory
> > localhost/acmel/linux-perf-tools-build-alpine:edge:ls: /usr/lib64/libbpf.so.1: No such file or directory
> > localhost/acmel/linux-perf-tools-build-alt:p9:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-alt:p10:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-alt:sisyphus:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-amazonlinux:2:ls: cannot access /usr/lib64/libbpf.so.1: No such file or directory
> > localhost/acmel/linux-perf-tools-build-amazonlinux:devel:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-archlinux:base:lrwxrwxrwx 1 root root 15 Oct 1 12:32 /usr/lib64/libbpf.so.1 -> libbpf.so.1.0.1
> > localhost/acmel/linux-perf-tools-build-centos:8:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-centos:stream:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-clearlinux:latest:lrwxrwxrwx 1 root root 15 Sep 30 16:01 /usr/lib64/libbpf.so.1 -> libbpf.so.1.0.1
> > localhost/acmel/linux-perf-tools-build-debian:10:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-debian:11:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-debian:experimental:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-fedora:26:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-fedora:27:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-fedora:28:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-fedora:29:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-fedora:30:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-fedora:31:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-fedora:32:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-fedora:33:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-fedora:34:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-fedora:35:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-fedora:36:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-fedora:37:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-fedora:38:lrwxrwxrwx. 1 root root 15 Dec 20 14:39 /usr/lib64/libbpf.so.1 -> libbpf.so.1.0.0
> > localhost/acmel/linux-perf-tools-build-fedora:rawhide:lrwxrwxrwx. 1 root root 15 Dec 20 14:39 /usr/lib64/libbpf.so.1 -> libbpf.so.1.0.0
> > localhost/acmel/linux-perf-tools-build-gentoo-stage3:latest:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-manjaro:base:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-opensuse:15.0:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-opensuse:15.1:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-opensuse:15.2:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-opensuse:15.3:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-opensuse:15.4:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-opensuse:15.5:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-opensuse:tumbleweed:lrwxrwxrwx. 1 root root 15 Nov 9 12:08 /usr/lib64/libbpf.so.1 -> libbpf.so.1.0.1
> > localhost/acmel/linux-perf-tools-build-oraclelinux:8:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-oraclelinux:9:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-rockylinux:8:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-rockylinux:9:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-ubuntu:18.04:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-ubuntu:20.04:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-ubuntu:21.04:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-ubuntu:21.10:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-ubuntu:22.04:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-ubuntu:22.10:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > localhost/acmel/linux-perf-tools-build-ubuntu:23.04:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
> > [perfbuilder@five ~]$
> >
> > [perfbuilder@five linux-perf-tools-build]$ grep libbpf-dev */*/Dockerfile
> > debian/experimental/Dockerfile:       libbpf-dev \
> > fedora/35/Dockerfile:            libtraceevent-devel libbpf-devel \
> > fedora/36/Dockerfile:            libtraceevent-devel libbpf-devel \
> > fedora/37/Dockerfile:            libtraceevent-devel libbpf-devel \
> > fedora/38/Dockerfile:            libtraceevent-devel libbpf-devel \
> > fedora/rawhide/Dockerfile:    libtraceevent-devel libbpf-devel \
> > opensuse/tumbleweed/Dockerfile:       libbpf-devel libtraceevent-devel \
> > ubuntu/22.04/Dockerfile:      libelf-dev libiberty-dev libdw-dev libaudit-dev libtraceevent-dev libbpf-dev \
> > ubuntu/22.10/Dockerfile:      libelf-dev libiberty-dev libdw-dev libaudit-dev libtraceevent-dev libbpf-dev \
> > ubuntu/23.04/Dockerfile:      libelf-dev libiberty-dev libdw-dev libaudit-dev libtraceevent-dev libbpf-dev \
> > [perfbuilder@five linux-perf-tools-build]$
> >
> > In some cases it gets dragged on differently, like with clearlinux,
> > gentoo, archlinux, etc.
> >
> > Anyway, just a data point, I'll check if I'm missing installing it
> > somewhere.
> >
> > - Arnaldo