netdev - Re: [PATCHv2 0/3] perf tools: Fix prologue generation

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Date:   Wed, 11 May 2022 15:22:38 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <olsajiri@...il.com>
Cc:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        "linux-perf-use." <linux-perf-users@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCHv2 0/3] perf tools: Fix prologue generation

Em Wed, May 11, 2022 at 09:35:34AM +0200, Jiri Olsa escreveu:
> On Tue, May 10, 2022 at 04:48:55PM -0700, Andrii Nakryiko wrote:
> > On Tue, May 10, 2022 at 12:47 AM Jiri Olsa <jolsa@...nel.org> wrote:
> > >
> > > hi,
> > > sending change we discussed some time ago [1] to get rid of
> > > some deprecated functions we use in perf prologue code.
> > >
> > > Despite the gloomy discussion I think the final code does
> > > not look that bad ;-)
> > >
> > > This patchset removes following libbpf functions from perf:
> > >   bpf_program__set_prep
> > >   bpf_program__nth_fd
> > >   struct bpf_prog_prep_result
> > >
> > > v2 changes:
> > >   - use fallback section prog handler, so we don't need to
> > >     use section prefix [Andrii]
> > >   - realloc prog->insns array in bpf_program__set_insns [Andrii]
> > >   - squash patch 1 from previous version with
> > >     bpf_program__set_insns change [Daniel]
> > >   - patch 3 already merged [Arnaldo]
> > >   - added more comments
> > >
> > >   meanwhile.. perf/core and bpf-next diverged, so:
> > >     - libbpf bpf_program__set_insns change is based on bpf-next/master
> > >     - perf changes do not apply on bpf-next/master so they are based on
> > >       perf/core ... however they can be merged only after we release
> > >       libbpf 0.8.0 with bpf_program__set_insns change, so we don't break
> > >       the dynamic linking
> > >       I'm sending perf changes now just for review, I'll resend them
> > >       once libbpf 0.8.0 is released
> > >
> > > thanks,
> > > jirka
> > >
> > >
> > > [1] https://lore.kernel.org/bpf/CAEf4BzaiBO3_617kkXZdYJ8hS8YF--ZLgapNbgeeEJ-pY0H88g@mail.gmail.com/
> > > ---
> > > Jiri Olsa (1):
> > >       libbpf: Add bpf_program__set_insns function
> > >
> > 
> > The first patch looks good to me. The rest I can't really review and
> > test properly, so I'll leave it up to Arnaldo.
> > 
> > Arnaldo, how do we coordinate these patches? Should they go through
> > bpf-next (after you Ack them) or you want them in your tree?
> > 
> > I'd like to get the bpf_program__set_insns() patch into bpf-next so
> > that I can do libbpf v0.8 release, having it in a separate tree is
> > extremely inconvenient. Please let me know how you think we should
> > proceed?
> 
> we need to wait with perf changes after the libbpf is merged and
> libbpf 0.8.0 is released.. so we don't break dynamic linking for
> perf
> 
> at the moment please just take libbpf change and I'll resend the
> perf change later if needed

Ok.

- Arnaldo