linux-kernel - Re: [PATCHv2 0/3] perf/bpf: Replace deprecated code

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Message-ID: <Yg9ghL33UYyh3es4@krava>
Date:   Fri, 18 Feb 2022 10:01:56 +0100
From:   Jiri Olsa <olsajiri@...il.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        "linux-perf-use." <linux-perf-users@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCHv2 0/3] perf/bpf: Replace deprecated code

On Thu, Feb 17, 2022 at 01:55:13PM -0800, Andrii Nakryiko wrote:
> On Thu, Feb 17, 2022 at 5:19 AM Jiri Olsa <jolsa@...nel.org> wrote:
> >
> > hi,
> > the original patchset [1] removed the whole perf functionality
> > with the hope nobody's using that. But it turned out there's
> > actually bpf script using prologue functionality, so there
> > might be users of this.
> >
> > This patchset gets rid of and adds workaround (and keeps the
> > current functionality) for following deprecated libbpf
> > functions/struct:
> >
> >   bpf_program__set_priv
> >   bpf_program__priv
> >   bpf_map__set_priv
> >   bpf_map__priv
> >   bpf_program__set_prep
> >   bpf_program__nth_fd
> >   struct bpf_prog_prep_result
> >
> > Basically it implements workarounds suggested by Andrii in [2].
> >
> > I tested with script from examples/bpf that are working for me:
> >
> >   examples/bpf/hello.c
> >   examples/bpf/5sec.c
> >
> > The rest seem to fail for various reasons even without this
> > change..  they seem unmaintained for some time now, but I might
> > have wrong setup.
> >
> > Also available in here:
> >   git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
> >   perf/depre
> >
> > thanks,
> > jirka
> >
> >
> > [1] https://lore.kernel.org/linux-perf-users/YgoPxhE3OEEmZqla@krava/T/#t
> > [2] https://lore.kernel.org/linux-perf-users/YgoPxhE3OEEmZqla@krava/T/#md3ccab9fe70a4583e94603b1a562e369bd67b17d
> > ---
> > Jiri Olsa (3):
> >       perf tools: Remove bpf_program__set_priv/bpf_program__priv usage
> >       perf tools: Remove bpf_map__set_priv/bpf_map__priv usage
> >       perf tools: Rework prologue generation code
> >
> 
> It's great that you are deprecating these, thanks a lot for that! I
> suggest to also doing libbpf_set_strict_mode(LIBBPF_STRICT_ALL) to

will check

> check that libbpf 1.0 won't break anything. For example, you'll need
> to use a custom SEC() handler to handle those quirky sections that
> perf allows. This patch set has landed in bpf-next, so you should be
> good to go.

ah ok it already got merged.. I'll add it in new version

thanks,
jirka

> 
> 
> >  tools/perf/util/bpf-loader.c | 267 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----------------
> >  1 file changed, 230 insertions(+), 37 deletions(-)