linux-kernel - Re: [PATCH v2 2/8] libbpf: Move opts code into dedicated header

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Message-ID: <Zqfxl82VCxUUi3R+@ghost>
Date: Mon, 29 Jul 2024 12:46:31 -0700
From: Charlie Jenkins <charlie@...osinc.com>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Andrii Nakryiko <andrii@...nel.org>,
	Eduard Zingerman <eddyz87@...il.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH v2 2/8] libbpf: Move opts code into dedicated header

On Mon, Jul 29, 2024 at 11:59:47AM -0700, Andrii Nakryiko wrote:
> On Mon, Jul 29, 2024 at 10:55 AM Charlie Jenkins <charlie@...osinc.com> wrote:
> >
> > On Mon, Jul 29, 2024 at 10:01:05AM -0700, Andrii Nakryiko wrote:
> > > On Mon, Jul 29, 2024 at 9:46 AM Charlie Jenkins <charlie@...osinc.com> wrote:
> > > >
> > > > Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
> > > > ---
> > > >  tools/include/tools/opts.h      | 68 +++++++++++++++++++++++++++++++++++++++++
> > > >  tools/lib/bpf/bpf.c             |  1 +
> > > >  tools/lib/bpf/btf.c             |  1 +
> > > >  tools/lib/bpf/btf_dump.c        |  1 +
> > > >  tools/lib/bpf/libbpf.c          |  3 +-
> > > >  tools/lib/bpf/libbpf_internal.h | 48 -----------------------------
> > > >  tools/lib/bpf/linker.c          |  1 +
> > > >  tools/lib/bpf/netlink.c         |  1 +
> > > >  tools/lib/bpf/ringbuf.c         |  1 +
> > > >  9 files changed, 76 insertions(+), 49 deletions(-)
> > > >
> > >
> > > Nope, sorry, I don't think I want to do this for libbpf. This will
> > > just make Github synchronization trickier, and I don't really see a
> > > point.
> > >
> > > I'm totally fine with libperf making a copy of these helpers, though
> > > (this is not complicated or tricky code). I also don't think it will
> > > change much, so there is little risk of any sort of divergence.
> >
> > I did this because there were two comments on the previous version of
> > this patch that asked to change the functions that were copied over.  I
> > had a couple of choices, have the implementations diverge, not change
> > the implementation in perf to keep it the same as bpf, update both perf
> > and bpf, or share the implementations. I figured the last option was the
> > best to avoid immediate divergence. However, both of the comments can be
> > safely ignored, and also perhaps divergence doesn't matter.
> >
> 
> I mean, feel free to diverge. First and foremost the code has to make
> sense to specific library and specific use case. If libperf has some
> extra things that it needs to enforce or check, by all means. I just
> want to avoid unnecessary code sharing, given the code isn't tricky or
> complicated, but will complicate libbpf's sync story to Github (libbpf
> kind of lives in two places, kernel repo and Github repo).

Alright, I like to avoid copy-pasting code but if that's what is
required I will do that.

> 
> > - Charlie
> >
> > >
> > > [...]